99 results on '"Langlais RP"'
Search Results
2. Salivary secretion, mucin concentrations and candida carriage in HIV-infected patients
- Author
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Jainkittivong, A, primary, Lin, AL, additional, Johnson, DA, additional, Langlais, RP, additional, and Yeh, C-K, additional
- Published
- 2009
- Full Text
- View/download PDF
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3. Oral mucosal conditions in elderly dental patients
- Author
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Jainkittivong, A, primary, Aneksuk, V, additional, and Langlais, RP, additional
- Published
- 2002
- Full Text
- View/download PDF
4. Lingual cortical defect of the mandible: an unusual presentation and tomographic diagnosis
- Author
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Prapanpoch, S and Langlais, RP
- Abstract
A well-defined, bilocular radiolucency was found in the angle of the lower left mandibular ramus. The patient was asymptomatic. Serial cross-sectional tomography of the lesion revealed a lingual concavity in the mandibular cortical bone. A diagnosis of atypical Stafne's bone cavity was made. more...
- Published
- 1994
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5. A clinical comparison of extraoral panoramic and intraoral radiographic modalities for detecting proximal caries and visualizing open posterior interproximal contacts.
- Author
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Terry GL, Noujeim M, Langlais RP, Moore WS, and Prihoda TJ
- Subjects
- Adult, Area Under Curve, Bicuspid diagnostic imaging, Cuspid diagnostic imaging, Dental Enamel diagnostic imaging, Humans, Middle Aged, Molar diagnostic imaging, Observer Variation, ROC Curve, Young Adult, Dental Caries diagnostic imaging, Radiography, Bitewing statistics & numerical data, Radiography, Panoramic statistics & numerical data, Tooth Crown diagnostic imaging, X-Ray Intensifying Screens statistics & numerical data
- Abstract
Objectives: The purpose of this study was to compare extraoral panoramic bitewings (BWs) to intraoral photostimulable phosphor (PSP) plate BWs for the detection of proximal surface caries and to establish if there was any difference between extraoral BWs, intraoral BWs and panoramic radiographs in visualizing open posterior interproximal contacts., Methods: Extraoral panoramic and intraoral BW images were acquired on each of 20 patients, resulting in 489 total non-restored, readable surfaces that were evaluated by 4 observers. The ANOVA analysis to determine diagnostic variability between and within each subject was utilized. The surfaces included in the study extended from the distal of each canine to the last posterior contact in each arch with non-readable proximal surfaces excluded (i.e.surfaces where over half the enamel layer was overlapped or where those surfaces were not visible in one or both modalities)., Results: The statistical analysis indicated that the overall mean area under the receiver operating characteristic curves across all observers for the intraoral BWs and extraoral panoramic BWs were 0.832 and 0.827, respectively, and the difference of 0.005 was not significant at p = 0.7781. The percentage of non-readable proximal surfaces across the three modalities was 4.1% for intraoral BWs, 18.3% for extraoral panoramic BWs and 51.5% for the standard panoramic images., Conclusions: The investigators concluded there was no significant difference in posterior proximal surface caries detection between the modalities. Extraoral panoramic BWs were much better than panoramic radiographs in visualizing open posterior interproximal contacts, 81.7% vs 48.5%, but below the 95.9% value for intraoral BWs. more...
- Published
- 2016
- Full Text
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6. Trigeminal neuralgia: a retrospective study of 188 Thai cases.
- Author
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Jainkittivong A, Aneksuk V, and Langlais RP
- Subjects
- Adult, Age Factors, Aged, Aged, 80 and over, Analgesics, Non-Narcotic therapeutic use, Carbamazepine therapeutic use, Chronic Disease, Cryosurgery statistics & numerical data, Drug Therapy, Combination, Female, Humans, Incidence, Male, Mandibular Nerve physiopathology, Mastication physiology, Maxillary Nerve physiopathology, Middle Aged, Muscle Relaxants, Central therapeutic use, Phenytoin therapeutic use, Retrospective Studies, Sex Factors, Speech physiology, Thailand epidemiology, Tooth innervation, Tooth Extraction statistics & numerical data, Young Adult, Trigeminal Neuralgia epidemiology
- Abstract
Objective: To describe the clinical characteristics and treatment of trigeminal neuralgia (TN) in a group of Thai patients., Materials and Methods: Records of 188 patients with TN were reviewed retrospectively for patient demographics, the characteristics of the pain and treatment modalities., Results: Of the 188 patients, 37.2% were men and 62.8% were women. The peak incidence (46.8%) was in the age range of 50-69 years. Pain occurred on the right side of the face more often than on the left (1.8:1). The mandibular division of the trigeminal nerve was the most frequently affected (30.3%), followed by the combined maxillary and mandibular divisions (29.3%) and the maxillary division alone (25%). The majority described their attack as a sharp pain (77.6%), and the most common primary locations were at previous extraction sites (40.5%). The most common triggers were chewing (61.2%) and speaking (47.3%). Carbamazepine was the most common prescribed drug (76.1%) for the initial treatment. Combination drug therapy was introduced when the monotherapy failed to control the pain. Surgical intervention was the alternative choice of treatment in refractory cases., Conclusion: TN affected women more than men, and this disorder occurred most frequently in patients aged 50 years and older. The mandibular division of the trigeminal nerve was most commonly involved., (© 2011 The Gerodontology Society and John Wiley & Sons A/S.) more...
- Published
- 2012
- Full Text
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7. Pre-clinical evaluation of a new dental panoramic radiographic system based on tomosynthesis method.
- Author
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Noujeim M, Prihoda T, McDavid WD, Ogawa K, Yamakawa T, Seki K, Okano T, Sue T, and Langlais RP
- Subjects
- Analysis of Variance, Cadmium Compounds, Cracked Tooth Syndrome diagnostic imaging, Dental Pulp Cavity diagnostic imaging, Humans, Periodontal Ligament diagnostic imaging, Phantoms, Imaging, Skull diagnostic imaging, Software, Tellurium, Tomography, X-Ray Computed, Tooth Apex diagnostic imaging, X-Ray Intensifying Screens, Image Processing, Computer-Assisted methods, Radiography, Panoramic instrumentation, Radiography, Panoramic methods
- Abstract
Objectives: The purpose of the study was to compare the image generated by a classic panoramic machine equipped with a cadmium telluride sensor capable of digital tomosynthesis and special software with images produced by other popular panoramic X-ray machines using a charge-coupled device and native software for image capture., Methods: Panoramic images were made using a phantom of a human skull on Planmeca ProMax, Planmeca EC Proline, Kodak 8000 and PC-1000. With the last machine we used the PanoACT® software to adjust the entire arch and to adjust the image in selected regions of interest (ROIs). Ten viewers evaluated the images and provided the viewer data. ANOVA for repeated measures was used to compare the means by pairwise comparisons of means., Results: The image of the entire arch adjusted by the PanoACT® software was statistically superior to the images produced by other machines. The images generated and individually adjusted by PanoACT® were statistically superior to all other images., Conclusions: The image generated by the cadmium telluride sensor has great potential and can be processed to create superior images to those taken with other machines. Furthermore, the ROI individual images enhanced by the PanoACT® were superior to the entire arch adjusted by the same software. more...
- Published
- 2011
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8. Imaging modalities to access bony tumors and hyperplasic reactions of the temporomandibular joint.
- Author
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Shintaku WH, Venturin JS, Langlais RP, and Clark GT
- Subjects
- Cone-Beam Computed Tomography, Humans, Hyperplasia diagnosis, Magnetic Resonance Imaging, Positron-Emission Tomography, Radiography, Panoramic, Sensitivity and Specificity, Temporomandibular Joint diagnostic imaging, Temporomandibular Joint pathology, Tomography, Emission-Computed, Single-Photon, Tomography, X-Ray Computed, Bone Neoplasms diagnosis, Diagnostic Imaging methods, Head and Neck Neoplasms diagnosis, Temporomandibular Joint Disorders diagnosis
- Abstract
Benign and malignant tumors in the temporomandibular joint (TMJ) are rare. However, when a patient presents with clinical findings such as altered occlusion or facial asymmetry, a morphologic alteration in the condyle should be ruled out. The differential diagnosis for benign hyperplastic bony lesions in the TMJ should include condylar hyperplasia, osteochondroma, osteoma, chondroma, and osteoblastoma. If malignant features are present, chondrosarcoma and osteosarcoma should be considered. For the differential diagnosis, imaging is the most noninvasive method to evaluate the integrity of the TMJ. Imaging can be classified as morphologic or functional according to the information provided. The current scientific data have shown that panoramic images have 97% sensitivity and 45% specificity for identifying hyperplastic conditions in the TMJ. The sensitivity and specificity of medical computed tomography (CT) and cone-beam CT is 70% and 100%, and 80% and 100%, respectively, for the detection of bony abnormalities. To differentiate benign and malignant bony tumors, magnetic resonance imaging has a sensitivity and specificity of 44% and 95%, respectively. The corresponding percentages for single positron emission CT are 91% and 94%, for single positron emission CT/CT are 100% and 100%, for positron emission tomography are 88% and 72%, and for positron emission tomography/CT are 100% and 97%. The combination of morphologic and functional (single positron emission CT and positron emission tomography) modalities appears to improve the sensitivity and specificity to assess a hyperplastic condyle, facilitating treatment planning and providing a better prognosis for the patient., (Copyright 2010 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.) more...
- Published
- 2010
- Full Text
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9. Oral mucosal lesions in denture wearers.
- Author
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Jainkittivong A, Aneksuk V, and Langlais RP
- Subjects
- Age Factors, Aged, Atrophy, Candidiasis, Oral epidemiology, Cheilitis epidemiology, Denture, Complete statistics & numerical data, Denture, Partial statistics & numerical data, Disease, Female, Friction, Humans, Hyperplasia, Leukoedema, Oral epidemiology, Leukoplakia, Oral epidemiology, Male, Middle Aged, Mouth Mucosa pathology, Oral Ulcer epidemiology, Prevalence, Retrospective Studies, Sex Factors, Stomatitis, Denture epidemiology, Thailand epidemiology, Tongue pathology, Tongue, Fissured epidemiology, Dentures statistics & numerical data, Mouth Diseases epidemiology
- Abstract
Objective: To determine the prevalence of oral mucosal lesions (OMLs) and denture-related mucosal lesions (DMLs) in denture wearers and to co-relate the prevalence with age, gender, type of denture and any systemic conditions., Materials and Methods: Dental records of 380 denture wearers were retrospectively reviewed for OMLs and DMLs., Results: We found 45% of the denture wearers had DMLs and 60.8% had OMLs not related to denture wearing. Although the prevalence of DMLs was higher in complete denture wearers than in partial denture wearers (49% vs. 42.2%), this difference was not significant. The most common DMLs were traumatic ulcer (19.5%) and denture-induced stomatitis (18.1%). When analysed by type, traumatic ulcer, denture hyperplasia, frictional keratosis and candidiasis were more common in complete denture wearers, whereas denture-induced stomatitis was more common in partial denture wearers. Frictional keratosis was more common in men than in women. The prevalence of OMLs not related to denture wearing was higher in complete denture wearers than in partial denture wearers, and the most common OML was fissured tongue (27.6%). No association between DMLs and systemic conditions or xerostomic drugs was noted., Conclusion: No differences in the prevalence of DMLs in association with denture type were found. The prevalence of OMLs not related to denture wearing was higher in complete denture wearers than in partial denture wearers. This difference was affected by age, and the data were similar to the findings observed in the elderly. more...
- Published
- 2010
- Full Text
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10. Development of a new dental panoramic radiographic system based on a tomosynthesis method.
- Author
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Ogawa K, Langlais RP, McDavid WD, Noujeim M, Seki K, Okano T, Yamakawa T, and Sue T
- Subjects
- Humans, Phantoms, Imaging, Semiconductors, Signal Processing, Computer-Assisted, Imaging, Three-Dimensional methods, Jaw diagnostic imaging, Radiographic Image Enhancement methods, Radiography, Panoramic methods
- Abstract
The objective of this study was to develop a new practical method to reconstruct a high-quality panoramic image in which radiographers would be free from the onerous task of correctly locating the patient's jaws within the image layer of the panoramic unit. In addition, dentists would be able to freely select any panoramic plane to be reconstructed after the acquisition of the raw scan data. A high-speed data acquisition device was used with a CdTe (cadmium telluride) semiconductor detector and a sophisticated digital signal-processing technique based on tomosynthesis was developed. The system processes many vertical strip images acquired with the detector and generates a high-resolution and high-contrast image. To apply the tomosynthesis technique to the acquired strip images correctly, the actual movement of the panoramic unit was measured, including the X-ray tube and detector, in a scan using a calibration phantom and the authors generated a shift amount table needed for the shift-and-add tomosynthesis operation. The results of the experiments with a PanoACT-1000 panoramic unit, which was a PC-1000 panoramic unit fitted with a high frame rate semiconductor detector SCAN-300FPC, demonstrated the capability of a tomosynthesis technique which, when applied to the strip images of a dry skull phantom, could change the location and inclination of an imaging plane. This system allowed the extraction of an optimum-quality panoramic image regardless of irregularities in patient positioning. Moreover, the authors could freely reconstruct a fine image of an arbitrary plane with different parameters from those used in the original data acquisition to study fine anatomical details in specific locations. more...
- Published
- 2010
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11. Antifungal activity of Morinda citrifolia fruit extract against Candida albicans.
- Author
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Jainkittivong A, Butsarakamruha T, and Langlais RP
- Subjects
- Antifungal Agents administration & dosage, Candida albicans growth & development, Colony Count, Microbial, Culture Media, Humans, Microbial Sensitivity Tests, Mycology methods, Plant Extracts administration & dosage, Temperature, Time Factors, Antifungal Agents pharmacology, Candida albicans drug effects, Fruit, Morinda, Plant Extracts pharmacology, Plants, Medicinal
- Abstract
Objective: The objective of the study was to investigate the antifungal activity of Morinda citrifolia fruit extract on Candida albicans., Materials and Methods: Juice extract from M. citrifolia fruit was lyophilized and used in antifungal testing. Antifungal activity of M. citrifolia fruit extract against C. albicans was tested in vitro at various concentrations and for different contact times. The inhibitory effect of M. citrifolia extract on C. albicans was determined by cultures and an applied broth dilution test., Results: Using cultures, growth of C. albicans was not detected with 50 mg/mL of extract at 30-minute contact time or with 60 mg/mL of extract at 15-minute contact time. By the broth dilution test, the minimum fungicidal concentration of extract against C. albicans was 40 mg/mL at 90-minute contact time or with 50 mg/mL at 15-minute contact time., Conclusion: M. citrifolia fruit extract had an antifungal effect on C. albicans and the inhibitory effect varied with concentration and contact time. more...
- Published
- 2009
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12. Oral squamous cell carcinoma: a clinicopathological study of 342 Thai cases.
- Author
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Jainkittivong A, Swasdison S, Thangpisityotin M, and Langlais RP
- Subjects
- Adult, Age Factors, Aged, Alveolar Process pathology, Carcinoma, Squamous Cell pathology, Chi-Square Distribution, Female, Gingival Neoplasms pathology, Humans, Incidence, Male, Middle Aged, Mouth Neoplasms pathology, Sex Distribution, Thailand epidemiology, Carcinoma, Squamous Cell epidemiology, Gingival Neoplasms epidemiology, Mouth Neoplasms epidemiology
- Abstract
Aim: To conduct a clinicopathological review of oral squamous cell carcinoma (SCC) and to analyze it with respect to gender, age at diagnosis, clinical presentation, lesion location, and histological grading., Methods and Materials: Information on the clinicopathological characteristics of SCC was obtained from pathology reports of 342 cases., Results: The male to female ratio was 1:1 and the incidence increased with age. Among the patients 4.7% were younger than 40 years and males were predominant in this subgroup. The alveolar ridge and gingiva were the most commonly affected sites (50%). The majority of the SCC cases presented as ulcers or masses. Swelling and/or pain were the first signs and/or symptoms in most patients (52.6%). The age at diagnosis in relation to the site of occurrence varied. Conventional SCC was the most common subtype (88%). Well-differentiated SCC was the most common histological grading (78.6%)., Conclusion: In the present study, the incidence of SCC was age-related and showed equal gender distribution., Clinical Significance: Routine examination of the oral cavity by dental practitioners and other health care providers aids in the early detection of premalignant and malignant oral disease. Dentists can play a significant role in disseminating information regarding oral cancer. more...
- Published
- 2009
13. Relationship between density variability and imaging volume size in cone-beam computerized tomographic scanning of the maxillofacial region: an in vitro study.
- Author
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Katsumata A, Hirukawa A, Okumura S, Naitoh M, Fujishita M, Ariji E, and Langlais RP
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- Algorithms, Bone Density, Cadaver, Cervical Vertebrae diagnostic imaging, Humans, Phantoms, Imaging, Radiation Dosage, Radiographic Image Interpretation, Computer-Assisted, Software, Cone-Beam Computed Tomography instrumentation, Mandible diagnostic imaging, Radiography, Dental methods
- Abstract
Objective: In limited-volume cone-beam computerized tomography (CBCT) imaging, projection data discontinuity caused by maxillofacial hard tissue structures outside the reconstructed volume are reported to affect the density value of the hard and soft tissue structures within the volume. The intensity of this effect is purported to be related to the size of the imaging volume. The aim of this study was to characterize the effect of the size of the scanned volume on density values in vitro., Study Design: Test objects were positioned in a custom phantom in the following 4 patterns: bimandible and vertebrae, bimandible, left mandible and vertebrae, and left mandible. We used a newly developed flat panel detector CBCT system (Alphard Vega; Asahi Roentgen, Kyoto, Japan) to acquire scans of the left molar region using cylindrical volumes of approximately 5, 10, 15, and 20 cm in diameter and height. The density values of the mandible and the adjacent soft tissue regions were analyzed., Results: Highest density variability was observed in the smallest-volume (5 cm) scans. Density variability increased when more objects were included outside the area being imaged. Fewer effects were noted in CBCT scans of larger (10, 15, and 20 cm) volumes., Conclusion: Larger-volume CBCT scans may yield more consistent density values. Smaller CBCT volumes have the advantages of better image resolution and lower radiation doses. The optimization of the image characteristics is maximized by careful consideration of the purpose of the CBCT examination. more...
- Published
- 2009
- Full Text
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14. Effects of image artifacts on gray-value density in limited-volume cone-beam computerized tomography.
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Katsumata A, Hirukawa A, Okumura S, Naitoh M, Fujishita M, Ariji E, and Langlais RP
- Subjects
- Humans, Phantoms, Imaging, Spine diagnostic imaging, Artifacts, Cone-Beam Computed Tomography, Image Processing, Computer-Assisted methods, Mandible diagnostic imaging
- Abstract
Objective: An in vitro study was designed to investigate the influence of projection data discontinuity-related artifacts in limited-volume cone-beam computerized tomography (CBCT) imaging of the jaws., Study Design: Test objects were positioned in 4 patterns in a water-filled phantom as follows: bimandible and vertebrae, bimandible, left mandible and vertebrae, and left mandible. The CT imaging of the left molar region was performed using image intensifier (II)- and flat panel detector (FPD)-based CBCT scanners. The CT value of the mandible and the adjacent soft tissue region were analyzed for density by means of an 8-bit grayscale., Results: The effects of artifacts were scored as the difference in relative density between the lingual and buccal soft tissue. The intensity of artifacts increased when more objects were presented outside the area being imaged. Fewer artifacts were noted in images produced by the particular FPD CBCT used in this investigation., Conclusion: The CBCT system using an FPD resulted in fewer artifacts than the CBCT system using an II in this particular study. more...
- Published
- 2007
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15. Accuracy of cone beam computed tomography in determining the location of the genial tubercle.
- Author
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Hueman EM, Noujeim ME, Langlais RP, Prihoda TJ, and Miller FR
- Subjects
- Adult, Alveolar Process anatomy & histology, Alveolar Process diagnostic imaging, Cadaver, Cephalometry methods, Chin anatomy & histology, Dissection, Humans, Image Processing, Computer-Assisted methods, Mandible anatomy & histology, Chin diagnostic imaging, Imaging, Three-Dimensional methods, Mandible diagnostic imaging, Tomography, X-Ray Computed methods
- Abstract
Objective: To determine the accuracy of cone beam computed tomography (CT) to predict the location of the genial tubercle., Study Design and Setting: Cadaver study for anatomic analysis of 17 adult human cadaver heads. Each skull/cadaver head underwent radiographic imaging with cone beam CT and cadaver dissection. Measurements, including mandibular height (MH), genial tubercle width (GTW), genial tubercle height (GTH), distance from inferior border of mandible to genial tubercle (IBM/GT), and mandibular thickness (MT) were recorded., Results: Statistical analysis with paired t test showed no significant difference between cadaver dissections versus cone beam measurements. Ninety-five percent confidence intervals (CI) were as follows: GTW (-0.2 to 1.0), GTH (-0.1 to 0.9), distance IBM/GT (-0.8 to 5.0), MH (-1.3 to -2.6), and MT (-0.1 to 0.3)., Conclusion: These results show the accuracy of the 3D cone beam CT in the anatomic location of the genial tubercle., Significance: This radiographic technique may prove useful in pre-operative planning for the mandibular osteotomy in genioglossus advancement procedures. more...
- Published
- 2007
- Full Text
- View/download PDF
16. Image artifact in dental cone-beam CT.
- Author
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Katsumata A, Hirukawa A, Noujeim M, Okumura S, Naitoh M, Fujishita M, Ariji E, and Langlais RP
- Subjects
- Humans, Phantoms, Imaging, Tomography, Spiral Computed, X-Ray Intensifying Screens, Artifacts, Radiography, Dental methods
- Abstract
Purpose: The purpose of this study was to investigate the appearance and possible cause of an artifact seen in limited-volume cone-beam CT imaging., Methods: A water-filled plastic cylinder was used as a phantom of the head. A test object was constructed as a bone-equivalent phantom to be imaged. The test object was variously positioned at the center of the phantom and near its margins. CT images of the test object were acquired using a 3DX Accuitomo system., Results: In slice images with the test object positioned near the margin of the phantom, arch-shaped defects or deformities were observed on the side of the object. There was a negative correlation between the artifact and the CT value of the object. The artifact was larger in images scanned with a higher voltage., Conclusion: The probability that this artifact is caused by halation from the image intensifier (II) system is suggested. more...
- Published
- 2006
- Full Text
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17. Condylar head remodeling following mandibular setback osteotomy for prognathism: a comparative study of different imaging modalities.
- Author
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Katsumata A, Nojiri M, Fujishita M, Ariji Y, Ariji E, and Langlais RP
- Subjects
- Adolescent, Adult, Follow-Up Studies, Humans, Magnetic Resonance Imaging, Mandibular Condyle diagnostic imaging, Observer Variation, Osteotomy methods, Postoperative Period, Radiography, Dental, Single-Blind Method, Temporomandibular Joint anatomy & histology, Temporomandibular Joint diagnostic imaging, Tomography, X-Ray Computed, Bone Remodeling physiology, Diagnostic Imaging methods, Mandible surgery, Mandibular Condyle anatomy & histology, Oral Surgical Procedures, Prognathism surgery
- Abstract
Purpose: Condylar remodeling, which develops after mandibular setback osteotomy, was evaluated and compared in CT, plain film radiographs, and MR images acquired postoperatively., Methods: Thirty-nine patients treated with sagittal split ramus osteotomy (SSRO) and 46 patients treated with intraoral vertical ramus osteotomy (IVRO) were studied. Remodeling as seen in the images and the diagnostic agreement between imaging modalities was evaluated., Results: A newly formed bone layer in the posterior part of the condylar head was identified as a sign suggestive of remodeling. This sign was seen predominantly at periods over 6 months postoperatively. IVRO subjects had a higher incidence of remodeling than did the SSRO group. The diagnostic agreement between the 3 imaging modalities was substantial. There was a positive correlation between postoperative condylar displacement and the incidence of remodeling., Conclusions: The incidence of postoperative condylar head remodeling may be predictable. High-dose postoperative imaging studies to assess the TMJ should be restricted to those cases having a clear need for such studies. more...
- Published
- 2006
- Full Text
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18. Geographic tongue: clinical characteristics of 188 cases.
- Author
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Jainkittivong A and Langlais RP
- Subjects
- Adolescent, Adult, Age Distribution, Aged, Case-Control Studies, Child, Female, Glossitis, Benign Migratory complications, Glossitis, Benign Migratory epidemiology, Humans, Hypersensitivity complications, Male, Middle Aged, Sex Distribution, Thailand epidemiology, Tongue, Fissured complications, Glossitis, Benign Migratory pathology
- Abstract
The purpose of this study was to investigate the clinical characteristics and assess other factors associated with geographic tongue in Thailand. One hundred and eighty-eight Thais with geographic tongue and 188 controls were interviewed regarding their medical history, symptoms, and the nature and migratory pattern of their lesions. Variations in the clinical appearance, lesion location, and any associated tongue fissures were recorded. The age range for the 188 subjects was 9 to 79 years. The highest incidence (39.4%) occurred in the 20-29 age group. Women were affected more than men (1.5:1). The leading group of medical conditions consisted of allergy-related disorders; however, the incidence of these problems among both subjects and controls was not significantly different (55.2% vs. 44.8%). Our results demonstrated a significant co-existence of geographic tongue and fissured tongue. Most of the geographic tongue lesions manifested a typical appearance consisting of a central atrophic area bounded by a raised white circinate line (69.1%) with multiple tongue sites affected (62.8%). The most common locations were at the lateral margins and tip of the tongue. The majority of our subjects (75.5%) were asymptomatic. The results of this study correspond with the findings of previous geographic tongue studies in other populations. more...
- Published
- 2005
19. 3D-CT evaluation of facial asymmetry.
- Author
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Katsumata A, Fujishita M, Maeda M, Ariji Y, Ariji E, and Langlais RP
- Subjects
- Adolescent, Adult, Alveolar Process diagnostic imaging, Cephalometry, Female, Humans, Image Processing, Computer-Assisted methods, Incisor diagnostic imaging, Male, Mandible diagnostic imaging, Mandibular Condyle diagnostic imaging, Maxilla diagnostic imaging, Molar diagnostic imaging, Nasal Bone diagnostic imaging, Orbit diagnostic imaging, Retrospective Studies, Sella Turcica diagnostic imaging, Sphenoid Bone diagnostic imaging, Tomography, Spiral Computed, Facial Asymmetry diagnostic imaging, Imaging, Three-Dimensional methods, Tomography, X-Ray Computed methods
- Abstract
Objective: Recently, 3-dimensional-computed tomography (3D-CT) imaging has been used in the diagnosis and surgical treatment planning of patients with craniofacial deformities. The present authors have developed a 3D-CT imaging procedure for a 3-dimensional coordinate point evaluation system to assess and diagnose patients with facial asymmetry., Study Design: The CT data of 16 subjects was selected retrospectively as the control group from patients who had undergone CT examinations to diagnose conditions other than maxillofacial deformities. Anatomical landmarks modified from orthodontic craniometric (cephalometric) points were defined on the 3D-CT images and the asymmetry index of each point was calculated in millimeters. A diagrammatic chart with a baseline indicating the mean asymmetry indices plus the standard deviation in the control group was designed. The resulting diagrammatic chart was used to evaluate the degree of deformity in facial asymmetry patients., Results and Conclusions: The topography of facial asymmetry was assessed. The 3D-CT imaging technique as described herein is a practical method of evaluating the morphology of facial asymmetry. more...
- Published
- 2005
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20. 3D CT evaluation of masseter muscle morphology after setback osteotomy for mandibular prognathism.
- Author
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Katsumata A, Fujishita M, Ariji Y, Ariji E, and Langlais RP
- Subjects
- Adolescent, Adult, Cephalometry, Female, Fracture Fixation, Internal, Humans, Image Processing, Computer-Assisted, Male, Mandible surgery, Prognathism surgery, Imaging, Three-Dimensional methods, Mandible diagnostic imaging, Masseter Muscle anatomy & histology, Muscular Atrophy diagnostic imaging, Osteotomy, Le Fort methods, Tomography, X-Ray Computed methods
- Abstract
Objective: Following mandibular setback osteotomy, changes in the direction, length, and cross-sectional area of the masseter muscle were studied by means of computerized tomography (CT) images generated with a 3-dimensional (3D) reconstructive technique., Study Design: Pre- and postoperative CT examinations were performed on 17 prognathic patients treated by sagittal split ramus osteotomy with rigid osteosynthesis and 13 patients treated by intraoral vertical ramus osteotomy without osteosynthesis. The pre- and postoperative masseter muscle direction and length were evaluated using 3D CT images observed from a lateral viewing angle. The cross-sectional area of the masseter muscle was first measured on an axial CT image of a selected slice level, following which the right-angle cross-sectional area of the muscle was revised using the measured area from the axial image., Results: Postoperatively, anterior tilting of the masseter muscle was observed; however, masseter muscle length was unchanged. Three months postoperatively, a significant reduction in the cross-sectional area of the masseter muscle was seen. A tendency to revert back to the normal dimension was seen between 6 months and 1 year postoperatively. No significant difference was noted between the 2 surgical techniques., Conclusions: Three-dimensional computed tomography is an adequate imaging modality for masseter muscle evaluation. The results of this study suggest the masseter muscle may undergo reversible atrophy after mandibular setback osteotomy. more...
- Published
- 2004
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21. NCRP report No. 145: New dental X-ray guidelines: their potential impact on your dental practice.
- Author
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Miles DA and Langlais RP
- Subjects
- Cephalometry, Filtration, Humans, Radiation Protection, Radiometry, Safety Management, Scattering, Radiation, United States, X-Ray Film, Radiography, Dental standards
- Published
- 2004
22. Medical health and medication use in elderly dental patients.
- Author
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Jainkittivong A, Aneksuk V, and Langlais RP
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- Age Factors, Aged, Chronic Disease, Female, Humans, Male, Medical History Taking, Middle Aged, Polypharmacy, Sex Factors, Thailand, Dental Care for Aged, Dental Care for Chronically Ill, Drug Utilization statistics & numerical data, Geriatric Assessment
- Abstract
The objectives of this study were to obtain information on the medical conditions and medications used among elderly Thai dental patients and to investigate the relationship between the findings in relation to age and sex. The information regarding medical conditions and medication use was obtained from interviews of 510 dental patients aged 60 years and older. The incidence of medical conditions was 82.5%; women had a significantly higher incidence of medical conditions (86.5%) than men (76.5%). The incidence of medical conditions did not differ among the three age groups. Overall, cardiovascular disease was the leading problem (33.7%) with hypertension being the major component (26.1%). The prevalent problems were bone/joint disorders (32.4%), allergies (18.2%), diabetes mellitus (14.5%), and eye and ear problems (14.3%). In our sample, 65.5% reported taking medications, with an average of 1.5 drug groups per person. The average number of medications taken increased as age increased. Women took medications more frequently than men (70% vs. 58.5%). The four most prevalent drugs were cardiovascular agents (32%), endocrinologic drugs (14.5%), nutritional therapeutics (12.9%), and drugs acting on the musculoskeletal system (11.4%). The present study supports the findings of previous reports in that the presence of medical conditions is high in the elderly and the incidence of medication use increases with advancing age. more...
- Published
- 2004
23. Maxillary sinus floor in edentulous and dentate patients.
- Author
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Ohba T, Langlais RP, Morimoto Y, Tanaka T, and Hashimoto K
- Subjects
- Aged, Alveolar Process diagnostic imaging, Cephalometry, Dentition, Female, Humans, Middle Aged, Nasal Cavity diagnostic imaging, Orbit diagnostic imaging, Radiography, Panoramic, Statistics as Topic, Jaw, Edentulous diagnostic imaging, Maxilla diagnostic imaging, Maxillary Sinus diagnostic imaging
- Abstract
To compare the depth of the maxillary sinus floor on panoramic radiographs between the edentulous and dentate patients. Thirty panoramic radiographs of edentulous female patients and 47 panoramic radiographs of female dentate patients were used for the sample. To measure the depth of the maxillary sinus floor, the outline of the maxillary sinus on the panoramic radiograph was traced on transparent paper. An apparent difference in depth of the maxillary sinus floor was recognized only in comparing the left sides of the edentulous and dentate jaws(P < 0.05). However, there was no statistical difference in the depth of the maxillary sinus floor between the right and left sides in the edentulous and dentate jaws. In this study there seems to be no difference in the depth of maxillary sinus floor between the right and left sides of either the edentulous or dentate jaws. It is not clear as to why, on the other hand, there is a statistical difference in between only the left maxillary sinus floor of the edentulous and dentate jaws, this apparent contradiction might be further investigated statistically. more...
- Published
- 2001
24. Buccal and palatal exostoses: prevalence and concurrence with tori.
- Author
-
Jainkittivong A and Langlais RP
- Subjects
- Adolescent, Adult, Age Distribution, Age Factors, Chi-Square Distribution, Female, Humans, Male, Mandibular Diseases complications, Maxillary Diseases complications, Middle Aged, Prevalence, Sex Distribution, Sex Factors, Statistics, Nonparametric, Thailand epidemiology, Exostoses complications, Exostoses epidemiology, Mandibular Diseases epidemiology, Maxillary Diseases epidemiology, Palate pathology
- Abstract
Objectives: The aims of this study were to investigate the prevalence and location of oral exostoses and the concurrence of buccal and palatal exostoses with tori., Study Design: With clinical inspection and palpation, 960 Thais were examined for the presence or absence of torus palatinus (TP), torus mandibularis (TM), and exostoses., Results: Of the 960 subjects studied, 26.9% exhibited exostoses. Exostoses were more common in the maxilla than in the mandible (5.1:1). In addition, most of the exostoses were located on the buccal aspect of the jaws. The prevalence of exostoses increased with age (P = .000). Exostoses were significantly more common in men than in women (62.4% vs 37.6%, P =.000). Exostoses were concurrent with TM more frequently than with TP (36.2% vs 20.6%). The highest concurrence of exostoses with tori was observed in subjects who had both TP and TM (42.6%)., Conclusions: The occurrence of exostoses is related to increasing age. TM and exostoses may share the same causative factors, and functional influences may contribute. Our findings lend support to the hypothesis that the etiology of exostoses involves an interplay of multifactorial genetic and environmental factors. more...
- Published
- 2000
- Full Text
- View/download PDF
25. Magnetic resonance imaging in dentistry.
- Author
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Langlais RP, van Rensburg LJ, Guidry J, Moore WS, Miles DA, and Nortjé CJ
- Subjects
- Adult, Contrast Media, Female, Humans, Image Processing, Computer-Assisted methods, Jaw Cysts diagnosis, Jaw Cysts diagnostic imaging, Joint Dislocations diagnosis, Male, Maxillary Diseases diagnosis, Maxillary Diseases diagnostic imaging, Radiography, Dental, Safety, Software, Temporomandibular Joint Disc pathology, Tomography, X-Ray Computed, Diagnosis, Oral, Magnetic Resonance Imaging instrumentation, Magnetic Resonance Imaging methods
- Abstract
MR imaging has found a place in the imaging sciences. These images are unique in that no ionizing radiation is used, the same tissues may or may not have different appearances with different machine settings, a unique set of terms is used to describe the findings in the images, and these findings can be analyzed with the view of obtaining more diagnostic information not readily available with any other imaging modality. Cases have been presented to help demonstrate differences in T1-weighted and T2-weighted sequences as well as the value of contrast material. Additionally, plain film and CT views were included so that they may be contrasted with the MR images. The role and application of CT versus MR imaging has been further discussed and illustrated by Nortjé and van Rensburg. A typical temporomandibular joint case has also been presented. In the future, it is hoped that clinicians will refer more patients for MR imaging so that diagnoses can be made more accurately with analytic software. more...
- Published
- 2000
26. Three-dimensional computed tomography imaging in dentistry.
- Author
-
Kawamata A, Ariji Y, and Langlais RP
- Subjects
- Anatomy, Cross-Sectional, Computer-Aided Design, Contrast Media, Dental Arch diagnostic imaging, Dental Implantation, Endosseous, Humans, Jaw diagnostic imaging, Patient Care Planning, Radiation Dosage, Radiographic Image Enhancement, Sialography, User-Computer Interface, Image Processing, Computer-Assisted methods, Radiography, Dental methods, Tomography, X-Ray Computed methods
- Abstract
The authors have presented several 3-D CT imaging techniques that may be useful in dentistry. MPR and dental MPR provides cross-sectional images of the jaws and the dental arches, and its utility in implant treatment planning is widely recognized. SSD allows the clinician to visualize the surface of an anatomic structure that is selected by a threshold value. Volume rendering is a powerful and flexible three-dimensional imaging technique that can create various unique images. MIP may be useful in contrast-enhanced CT examinations, such as sialography. Model production and virtual reality three-dimensional imaging may become major techniques in the near future. Although the increased radiation dose to the patients has to be considered, future imaging demands will bring more access to 3-D CT imaging by dental patients and, with adequate three-dimensional rendering techniques, more accurate diagnosis and treatment planning. more...
- Published
- 2000
27. Digital X-rays are here; why aren't you using them?
- Author
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Miles DA, Langlais RP, and Parks ET
- Subjects
- Humans, Radiography, Dental, Digital economics, Radiography, Dental, Digital statistics & numerical data
- Abstract
Digital imaging is here. It is cost-effective and helps dentists glean more useful information to make treatment decisions. Many more choices of digital systems are available for dentists to adopt than when the technology was introduced. The hardware is less costly than it was even one year ago, and image storage is now very inexpensive. Technical time is reduced, and no special training is required if the dentist or auxiliary has used a paralleling system. Insurance companies are gearing up to accept image files attached to claims. Why, then, are dentists not buying these systems as fast as manufacturer's can build them? This article explores that question and discusses the false assumptions behind perceived obstacles. more...
- Published
- 1999
28. Three-dimensional computed tomography evaluation of postsurgical condylar displacement after mandibular osteotomy.
- Author
-
Kawamata A, Fujishita M, Nagahara K, Kanematu N, Niwa K, and Langlais RP
- Subjects
- Adolescent, Adult, Bone Plates, Evaluation Studies as Topic, Female, Follow-Up Studies, Humans, Image Processing, Computer-Assisted methods, Male, Mandible diagnostic imaging, Mandibular Condyle surgery, Movement, Orthodontics, Corrective, Pilot Projects, Prognathism surgery, Rotation, Temporomandibular Joint diagnostic imaging, Mandible surgery, Mandibular Condyle diagnostic imaging, Osteotomy methods, Tomography, X-Ray Computed methods
- Abstract
Objective: The purpose of this study was to examine both condylar displacement of the temporomandibular joint after sagittal split ramus osteotomy with rigid osteosynthesis and intraoral vertical ramus osteotomy without osteosynthesis in patients with mandibular prognathism by means of three-dimensional computed tomography., Study Design: In this pilot study, five patients treated with sagittal split ramus osteotomy and 5 patients treated with intraoral vertical ramus osteotomy were evaluated. A technique to superimpose a postoperative three-dimensional computed tomography image on its corresponding preoperative image was designed. Postoperative condylar displacement, rotation, and tilting were measured in three-dimensional computed tomography images., Results: Within 3 to 6 months after surgery, changes in the inclination of the condylar axes were distinctly seen, although changes in the position of the condyles within the joints were minimal. In particular, outward rotation of the condylar long axes after intraoral vertical ramus osteotomy was a frequent finding., Conclusions: The three-dimensional computed tomography superimposition technique was a practical method of evaluating postsurgical condylar displacement after mandibular osteotomy. more...
- Published
- 1998
- Full Text
- View/download PDF
29. Herpes B virus infection.
- Author
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Jainkittivong A and Langlais RP
- Subjects
- Aerosols, Air Microbiology, Animals, Antiviral Agents therapeutic use, Body Fluids virology, Cause of Death, Dental Auxiliaries, Dentists, Encephalitis, Viral etiology, Herpes Simplex transmission, Herpesviridae Infections diagnosis, Herpesviridae Infections drug therapy, Herpesviridae Infections prevention & control, Humans, Laboratories, Occupational Diseases diagnosis, Occupational Diseases drug therapy, Occupational Diseases prevention & control, Occupational Exposure, Primates, Risk Factors, Saliva virology, Health Personnel, Herpesviridae Infections transmission, Herpesvirus 1, Cercopithecine, Macaca, Monkey Diseases transmission, Occupational Diseases virology
- Abstract
Herpes B virus (B virus) infection is common in macaques. Primary infection of B virus in primates is similar to herpes simplex virus 1 infection in human beings, but B virus generally produces only mild localized lesions in its natural host. In human beings, however, B virus can cause severe infection that may lead to death from encephalitis. Contact with monkey saliva, tissues, or tissue fluids is the most commonly reported route of transmission of B virus; a single case of person-to-person transmission has been reported. Airborne transmission is postulated to have occurred as a result of clinical circumstances in two reported cases, but there is no strong evidence to support the hypothesis of aerosol infection. Because B virus infection in human beings is often fatal, awareness of the risk of B virus infection should be emphasized. Although B virus infection in human beings is rare, it is an occupational health risk in exposed health care workers and laboratory personnel. This review of the literature of B virus infection includes case reports and a discussion of the nature of the B virus, characteristics of B virus infection in primates and human beings, the treatment of human infection, and the implications for dental health care providers. This report also serves as an introduction of the disease to the dental literature. more...
- Published
- 1998
- Full Text
- View/download PDF
30. Panoramic radiographic patterns of the infraorbital canal and anterior superior dental plexus.
- Author
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Scarfe WC, Langlais RP, Ohba T, Kawamata A, and Maselle I
- Subjects
- Adolescent, Adult, Aged, Aged, 80 and over, Child, Female, Humans, Male, Maxilla innervation, Maxillary Nerve diagnostic imaging, Middle Aged, Orbit innervation, Retrospective Studies, Maxilla diagnostic imaging, Maxillary Nerve anatomy & histology, Orbit diagnostic imaging, Radiography, Panoramic
- Abstract
Objective: To describe and classify the presentations of the infra-orbital canal/groove (IOC/G) complex and anterior superior dental plexus (ASDP) on panoramic radiographs., Methods: The frequency of occurrence and variations in appearance of the IOC/G were determined on 246 random panoramic radiographs. A classification system consisting of Types I, II and III was developed to describe the radiographic patterns of the IOC/G., Results: Two hundred radiographs (81.3%) demonstrated evidence of the IOG/C. The most frequent appearance of the IOC was Type III (44.75%) closely followed by Type I (42%) and Type II (13.25%), with only minor differences in prevalence between right and left sides. Sixty one percent were bilateral. Radiologic evidence of the ASDP was noted in 29% of radiographs demonstrating an IOG/C with 12% of cases being bilateral. Three distinct radiographic patterns of the anterior superior dental plexus (ASDP) were also observed., Conclusion: A classification of the appearance of the IOC/G and ASDP on panoramic radiographs has been presented. more...
- Published
- 1998
- Full Text
- View/download PDF
31. Solitary bone cyst of the jaws: radiographic review of 44 cases.
- Author
-
Copete MA, Kawamata A, and Langlais RP
- Subjects
- Humans, Jaw Cysts diagnostic imaging, Mandibular Diseases diagnostic imaging, Radiography, Panoramic, Jaw Cysts pathology, Mandibular Diseases pathology
- Abstract
Solitary bone cyst is a radiolucent lesion classified as a pseudocyst with a variety of reported shapes including round, oval, and irregular. In the long bones, a truncated cone shape has been described, and the fallen trabecula sign is seen in association with pathologic fracture. The purpose of this study was to classify and document the various shapes, to describe the width versus height dimensions of jaw SBCs, to determine the identifying signs of trauma, and to evaluate other reported radiographic features. Radiographs of 44 SBCs in 43 patients were studied. Sixty-four percent demonstrated the cone shape, and four subtypes of this shape were identified. Other shapes included oval (16%), irregular (16%), and round (4%). Radiographic signs of trauma were observed in 28% of the cases. No evidence of the "fallen trabecula sign" was found in this series. more...
- Published
- 1998
- Full Text
- View/download PDF
32. Conditions peculiar to the tongue.
- Author
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McNally MA and Langlais RP
- Subjects
- Humans, Tongue pathology, Tongue Neoplasms pathology, Tongue Diseases pathology
- Abstract
The tongue is the organ of taste, and it functions in speech, mastication, and the deglutition of food. This muscular organ is affected by many conditions and diseases, including a variety of developmental, traumatic, inflammatory, infectious, and neoplastic lesions. more...
- Published
- 1996
- Full Text
- View/download PDF
33. Early pioneers of oral and maxillofacial radiology.
- Author
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Langland OE and Langlais RP
- Subjects
- Germany, History, 19th Century, History, 20th Century, Technology, Radiologic history, United States, Radiography, Dental history
- Abstract
Because this year (1995) is the 100th anniversary of the discovery of radiography, it is appropriate that we again describe the events surrounding one of the most exciting times in our early dental x-ray history--the discovery of radiography by Roentgen and the application of radiography to the diagnosis and treatment of dental disease. Biographic sketches of some of the more prominent early pioneers in oral and maxillofacial radiology are presented, such as those of Walkhoff, Morton, Kells, Rollins, and Raper, along with a discussion of their contributions to the field. more...
- Published
- 1995
- Full Text
- View/download PDF
34. Infection control in dental radiology.
- Author
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Puttaiah R, Langlais RP, Katz JO, and Langland OE
- Subjects
- Cross Infection prevention & control, Cross Infection transmission, Dental Disinfectants, Equipment Contamination prevention & control, Humans, Infection Control, Dental methods, Radiography, Dental methods
- Abstract
Although exposure to blood is rare in oral and maxillofacial radiology, contact with saliva occurs. Thus the spread of infectious diseases is possible through cross-contamination, and specific infection control protocols and unit dosing of items are needed. This article outlines rationale for implementing state-of-the-art infection control procedures; and explains federal standards and guidelines with an impact on infection control and occupational safety in dental radiology procedures. more...
- Published
- 1995
35. Risks from dental radiation in 1995.
- Author
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Langlais RP and Langland OE
- Subjects
- Female, Humans, Maximum Allowable Concentration, Pregnancy, Radiation Dosage, Radiation Protection, Risk, Neoplasms, Radiation-Induced etiology, Neoplasms, Radiation-Induced mortality, Radiography, Dental adverse effects
- Abstract
Risks from dental radiation are primarily to the somatic tissues of exposed persons, although the genetic tissues may receive small amounts of radiation. Maximum permissible doses have been established at various levels depending on the tissue exposed and whether the exposure was occupational or non-occupational: for pregnant workers, the occupational exposure is 1/10 the normal limits. Risks from dental radiation is expressed as the number of extra fatal cancers per million exposed persons, referred to as relative risk. Generally, the relative risk is tenfold greater for the full mouth survey than for a simple panoramic radiograph. Several ways of reducing the risk, to patients as well as healthcare workers, are outlined. more...
- Published
- 1995
36. Lingual cortical defect of the mandible: an unusual presentation and tomographic diagnosis.
- Author
-
Prapanpoch S and Langlais RP
- Subjects
- Adult, Choristoma diagnostic imaging, Female, Humans, Radiography, Panoramic, Salivary Glands, Sialography, Tomography, X-Ray, Jaw Cysts diagnostic imaging, Mandibular Diseases diagnostic imaging
- Abstract
A well-defined, bilocular radiolucency was found in the angle of the lower left mandibular ramus. The patient was asymptomatic. Serial cross-sectional tomography of the lesion revealed a lingual concavity in the mandibular cortical bone. A diagnosis of atypical Stafne's bone cavity was made. more...
- Published
- 1994
- Full Text
- View/download PDF
37. Allergic stomatitis.
- Author
-
Jainkittivong A and Langlais RP
- Subjects
- Anaphylaxis diagnosis, Humans, Hypersensitivity, Immediate diagnosis, Lichenoid Eruptions diagnosis, Drug Hypersensitivity diagnosis, Hypersensitivity diagnosis, Stomatitis immunology
- Abstract
There are basically two types of hypersensitivity reactions involved in allergic stomatitis, type I immediate hypersensitivity, and type IV delayed hypersensitivity. The allergic stomatitides may present with clinical appearances that mimic classic oral vesiculobullous and ulcerative lesions. Differential diagnosis from specific mucosal diseases is important in the treatment of oral allergy. Precise history taking and the elimination of the causative agents will be necessary. The mechanisms involved in oral reactions, etiologic factors, clinical manifestations, and treatment of allergic stomatitis will be described and discussed in this article. more...
- Published
- 1994
38. Clinical comparison of two panoramic modalities and posterior bite-wing radiography in the detection of proximal dental caries.
- Author
-
Scarfe WC, Langlais RP, Nummikoski P, Dove SB, McDavid WD, Deahl ST, and Yuan CH
- Subjects
- False Positive Reactions, Female, Humans, Likelihood Functions, Male, Observer Variation, Quality Assurance, Health Care, ROC Curve, Radiography, Panoramic methods, Reproducibility of Results, Technology, Radiologic, Dental Caries diagnostic imaging, Radiography, Bitewing standards, Radiography, Panoramic standards
- Abstract
A clinical study was designed to examine whether the Philips OrthOralix SD (Gendex Dental Systems, Monza, Italy) orthogonal panoramic projection could improve diagnostic accuracy over standard projections in the detection of proximal surface caries. Thirty-five sets of radiographs that demonstrated optimal image characteristics were selected. Using a five-point scale, 18 viewers evaluated whether specified lesions were present or absent. Viewer data was then compared with a consensus radiographic assessment of the state of the proximal areas. Receiver operating characteristic curves were generated with the use of a maximum-likelihood method of fit. The area under the receiver operating characteristic curve was used as the index of diagnostic accuracy. The mean receiver operating characteristic areas for orthogonal and standard projection panoramic and bite-wing radiography to detect the presence of proximal dental caries were 0.68 +/- 0.03, 0.69 +/- 0.03, and 0.79 +/- 0.03 respectively. Critical ratio analysis was used to compare the means for all possible pairings of imaging modalities. In overall performance, conventional bite-wing radiographs gave a significantly greater diagnostic yield for proximal caries than the Philips OrthOralix SD orthogonal or standard panoramic modalities (p > 0.05). The orthogonal projection did not improve diagnostic accuracy in the detection of proximal carious lesions compared with the standard projection. more...
- Published
- 1994
- Full Text
- View/download PDF
39. Principles of radiographic selection and interpretation.
- Author
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Langlais RP, Rodriguez IE, and Maselle I
- Subjects
- Humans, Radiation Dosage, Stomatognathic Diseases diagnostic imaging, Radiography, Dental methods
- Abstract
When performing a radiologic examination, it is important for the clinician to follow a diagnostic sequence. Specific viewing principles are necessary to create the proper physical environment to obtain the most information from the radiographs. The selection of radiologic examination must be based on the ALARA (As Low As Reasonably Achievable) principle, and the clinician should use a method approach to radiologic interpretation. more...
- Published
- 1994
40. Radiolucencies with distinct borders.
- Author
-
Taylor TS and Langlais RP
- Subjects
- Diagnosis, Differential, Humans, Jaw Diseases diagnostic imaging, Mouth Diseases diagnostic imaging, Radiography, Dental, Tooth Diseases diagnostic imaging, Stomatognathic Diseases diagnostic imaging
- Abstract
The differential diagnosis of circumscribed radiolucencies or those with distinct borders requires careful evaluation of lesion-specific characteristics. This evaluation is necessary because of the variable prognosis and possible aggressiveness of lesions that may fall into this category, which also contains many benign conditions. This section reviews the clinical features, radiographic appearance, histopathologic findings, and treatment recommendations for a selected group of lesions. more...
- Published
- 1994
41. Drug-induced gingival overgrowth.
- Author
-
Dongari A, McDonnell HT, and Langlais RP
- Subjects
- Humans, Phenytoin adverse effects, Anticonvulsants adverse effects, Calcium Channel Blockers adverse effects, Cyclosporine adverse effects, Gingival Hypertrophy chemically induced
- Abstract
Certain anticonvulsants, cyclosporine, and a variety of calcium channel blockers have been shown to produce clinically and histologically similar gingival enlargements in certain susceptible patients. These drugs appear to be similar with respect to their pharmacologic mechanism of action at the cellular level. The primary target tissue is the most essential difference among them. Therefore it is tempting to speculate that these agents may act similarly on a common secondary target tissue, such as gingival connective tissue, and cause a hyperplastic response. This tissue reaction may involve a disturbance of calcium ion influx into specific cell populations with a resulting alteration in collagen metabolism and other host cell response mechanisms. A connection between ion exchange, folate uptake, collagenase activation, and bacterial inflammation may exist. Until a more effective approach can be developed from future research results, treatment should continue to emphasize plaque control, professional debridement, and resective gingival procedures to improve function, esthetics, and access for home care. more...
- Published
- 1993
- Full Text
- View/download PDF
42. Clinical significance of the panoramic innominate line in the diagnosis of a maxillary sinus carcinoma.
- Author
-
Ohba T, Langlais RP, and Langland OE
- Subjects
- Aged, Female, Humans, Male, Middle Aged, Tomography, X-Ray Computed, Maxillary Sinus Neoplasms diagnostic imaging, Radiography, Panoramic
- Published
- 1993
- Full Text
- View/download PDF
43. Digital subtraction temporomandibular joint tomography.
- Author
-
Prapanpoch S, Langlais RP, Dove SB, Prihoda TJ, McDavid WD, Nummikoski PV, and Preece JW
- Subjects
- Evaluation Studies as Topic, Humans, Likelihood Functions, Mandibular Condyle diagnostic imaging, Microcomputers, Observer Variation, ROC Curve, Radiographic Image Enhancement, Radiographic Image Interpretation, Computer-Assisted, Reproducibility of Results, Subtraction Technique, Tomography, X-Ray methods, Temporomandibular Joint diagnostic imaging, Temporomandibular Joint Disorders diagnostic imaging
- Abstract
Receiver operating characteristics analysis was performed to demonstrate differences in diagnostic performance among conventional tomograms, digitized tomograms, and subtraction tomograms. Digital subtraction tomography was found to be the best imaging modality for detecting artificially created lesions in the two selected temporomandibular joint locations. There was a statistically significant difference in diagnostic performance between conventional tomograms and subtraction tomograms for the detection of temporomandibular joint bony lesions. There was also a statistically significant difference in diagnostic performance between digitized tomograms and subtraction tomograms in the detection of these bony lesions. There was no statistically significant difference in diagnostic performance between conventional tomograms and digitized tomograms for the detection of temporomandibular joint bony lesions. The significance level was set at p = 0.05. Results of the analyses of variance showed that with digital subtraction tomograms, observer reliabilities were higher than with conventional and digitized tomograms. more...
- Published
- 1993
- Full Text
- View/download PDF
44. Winchester syndrome. A case report and literature review.
- Author
-
Prapanpoch S, Jorgenson RJ, Langlais RP, and Nummikoski PV
- Subjects
- Adult, Arthritis, Juvenile diagnosis, Carpal Bones abnormalities, Diagnosis, Differential, Female, Fibroma diagnosis, Growth Disorders diagnosis, Humans, Mucopolysaccharidoses diagnosis, Osteolysis, Essential diagnosis, Prognathism, Syndrome, Tarsal Bones abnormalities, Abnormalities, Multiple, Mucopolysaccharidoses pathology, Tooth Abnormalities
- Abstract
The mucopolysaccharidoses are a group of inherited lysosomal storage diseases that are caused by a deficiency of specific enzymes. The acid mucopolysaccharides are stored in tissue and excreted in large quantities in the urine. The storage of this material leads to effects on a wide variety of tissues and to remarkable changes in morphologic features. Winchester syndrome is a rare disorder in the group of mucopolysaccharidoses. This article is a report of a case with classic clinical, radiologic, and biochemical characteristics of the Winchester syndrome. more...
- Published
- 1992
- Full Text
- View/download PDF
45. Immediate biopsy versus a therapeutic trial in the diagnosis and treatment of vesiculobullous/vesiculoerosive oral lesions. Opposing viewpoints presented.
- Author
-
Brown RS, Bottomley WK, Abramovitch K, and Langlais RP
- Subjects
- Blister, Diagnosis, Differential, Humans, Mouth Diseases pathology, Biopsy, Mouth Diseases diagnosis, Mouth Diseases drug therapy
- Abstract
There are at least two treatment strategies in the diagnosis and treatment of oral vesiculobullous/vesiculoerosive disease. The relative merits of immediate biopsy and initial therapeutic trial regimens are debated. more...
- Published
- 1992
- Full Text
- View/download PDF
46. Cross-sectional radiography for implant site assessment.
- Author
-
Kassebaum DK, Nummikoski PV, Triplett RG, and Langlais RP
- Subjects
- Humans, Radiography, Dental methods, Vertical Dimension, Alveolar Process diagnostic imaging, Dental Implantation, Tomography methods
- Abstract
An accurate tomographic technique is described for acquisition of optimal cross-sectional images of implant sites before implant surgery. The described technique is applicable to tomographic systems equipped with a cephalometric head positioner. This cross-sectional tomographic technique was performed on a series of patients and the images of the first 20 patients subsequently evaluated. The cross-sectional images allowed for the characterization of the alveolar crest and visualization of anatomic structures in a buccolingual dimension while providing an accurate estimation of available vertical space from the crest. more...
- Published
- 1991
47. Cross-sectional tomography. A diagnostic technique for determining the buccolingual relationship of impacted mandibular third molars and the inferior alveolar neurovascular bundle.
- Author
-
Miller CS, Nummikoski PV, Barnett DA, and Langlais RP
- Subjects
- Adult, Female, Humans, Male, Mandible diagnostic imaging, Middle Aged, Radiography, Panoramic methods, Tooth Extraction adverse effects, Trigeminal Nerve Injuries, Mandibular Nerve diagnostic imaging, Molar, Third diagnostic imaging, Tomography, X-Ray methods, Tooth, Impacted diagnostic imaging
- Abstract
Twenty-two patients with 31 impacted mandibular third molars were examined with a new, precise, cross-sectional tomographic technique to assess the radiographic size, shape, branching pattern, location, and degree of cortication of the mandibular canal, and the inclination of impacted mandibular third molars in the buccolingual plane. The mandibular canal, including bifid canals, was accurately identified in 30 cases (96.8%). The cross-sectional appearance of the canal was an uncorticated, or partially corticated, radiolucent oval that measured on average (+/- SD) 2.9 +/- 0.7 x 2.5 +/- 0.6 mm in diameter. It was located more frequently (45.2%) on the buccal aspect of the impacted mandibular third molar. About 60% of the mandibular canals notched the inner cortical plate of the mandible or the third molar root surface. Cystic expansion and quantification of cortical bone destruction were readily assessed by this technique. It was concluded that diagnostic information obtained from cross-sectional tomograms significantly aids the oral and maxillofacial surgeon during the preoperative diagnostic workup and that the radiation risks are comparable to those of other accepted localization techniques. more...
- Published
- 1990
- Full Text
- View/download PDF
48. Cross-sectional radiography for implant site assessment.
- Author
-
Kassebaum DK, Nummikoski PV, Triplett RG, and Langlais RP
- Subjects
- Cephalometry instrumentation, Dental Implants, Dental Pins, Evaluation Studies as Topic, Humans, Mandible, Posture, Radiography, Panoramic instrumentation, Stents, Tomography, X-Ray instrumentation, Dental Implantation, Endosseous, Jaw, Edentulous diagnostic imaging, Radiography, Panoramic methods, Tomography, X-Ray methods
- Abstract
An accurate tomographic technique is described for acquisition of optimal cross-sectional images of implant sites before implant surgery. The described technique is applicable to tomographic systems equipped with a cephalometric head positioner. This cross-sectional tomographic technique was performed on a series of patients and the images of the first 20 patients subsequently evaluated. The cross-sectional images allowed for the characterization of the alveolar crest and visualization of anatomic structures in a buccolingual dimension while providing an accurate estimation of available vertical space from the crest. more...
- Published
- 1990
- Full Text
- View/download PDF
49. Anterior and posterior lingual depressions of the mandible.
- Author
-
Langlais RP, Cottone J, and Kasle MJ
- Subjects
- Bone Resorption diagnostic imaging, Humans, Mandible diagnostic imaging, Radiography, Mandible abnormalities
- Abstract
Both posterior and anterior lingual depressions occur in the mandible. The posterior lingual mandibular depressions appear to be more common than had been previously reported. This probably due to one or both of the following causes. Shallow lesions are difficult to diagnose radiographically since an appreciable depth of lingual cortical plate must be resorbed before they can be visualized. As these may be active lesions, a slow resorptive process could place the patient into middle age or beyond before the lesion is clinically diagnosed. It is suggested that posterior lingual mandibular depressions may be benign, self-limiting lesions that are caused by a slow resorptive process resulting from pressure of unknown origin. The anterior lingual mandibular depressions are variable findings in dried mandibles that appear grossly as round or oval smooth depressions with intact buccal and lingual cortical plates and, radiographically, as ill-defined radiolucent areas with no radiopaque borders. They are usually located in the incisor-lateral-canine area and are usually bilateral. It is suggested that these depressions may be developmental anomalies related to the buttons of Gaughran or that they may simply be anatomic variants. They differ from posterior depressions in both gross and radiographic appearance, which suggests the existence of two distinct entities. more...
- Published
- 1976
50. Effect of mycophenolic acid on healing of skin and buccal mucosal wounds in rats.
- Author
-
Langlais RP, El-Kafrawy AH, and Mitchell DF
- Subjects
- Animals, Male, Mouth Mucosa physiology, Rats, Skin Physiological Phenomena, Wound Healing drug effects, Mouth Mucosa drug effects, Mycophenolic Acid pharmacology, Skin drug effects
- Published
- 1976
- Full Text
- View/download PDF
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