79 results on '"Lee UL"'
Search Results
2. The effects of brain wave vibration on oxidative stress response and psychological symptoms
- Author
-
Lee, Do-Hyeong, Park, Hye Yoon, Lee, Ul Soon, Lee, Kyung-Jun, Noh, Eun Chung, Jang, Joon Hwan, and Kang, Do-Hyung
- Published
- 2015
- Full Text
- View/download PDF
3. A cross‐sectional study on the relationship between meditation training and emotional intelligence in women
- Author
-
Sung, Min‐Kyu, primary, Ha, Na Hyun, additional, Lee, Ul Soon, additional, and Yang, Hyun‐Jeong, additional
- Published
- 2020
- Full Text
- View/download PDF
4. The effect of meditation on brain structure: cortical thickness mapping and diffusion tensor imaging
- Author
-
Kang, Do-Hyung, Jo, Hang Joon, Jung, Wi Hoon, Kim, Sun Hyung, Jung, Ye-Ha, Choi, Chi-Hoon, Lee, Ul Soon, An, Seung Chan, Jang, Joon Hwan, and Kwon, Jun Soo
- Published
- 2013
- Full Text
- View/download PDF
5. A potential association of meditation with menopausal symptoms and blood chemistry in healthy women
- Author
-
Sung, Min-Kyu, primary, Lee, Ul Soon, additional, Ha, Na Hyun, additional, Koh, Eugene, additional, and Yang, Hyun-Jeong, additional
- Published
- 2020
- Full Text
- View/download PDF
6. Meditative Movement Affects Working Memory Related to Neural Activity in Adolescents: A Randomized Controlled Trial
- Author
-
Kang, Hojung, primary, An, Seung Chan, additional, Kim, Nah Ok, additional, Sung, Minkyu, additional, Kang, Yunjung, additional, Lee, Ul Soon, additional, and Yang, Hyun-Jeong, additional
- Published
- 2020
- Full Text
- View/download PDF
7. A cross‐sectional study on the relationship between meditation training and emotional intelligence in women.
- Author
-
Sung, Min‐Kyu, Ha, Na Hyun, Lee, Ul Soon, and Yang, Hyun‐Jeong
- Subjects
MEDITATION ,SLEEP quality ,CROSS-sectional method ,SELF-evaluation ,WOMEN ,REGRESSION analysis ,MELATONIN ,PEARSON correlation (Statistics) ,T-test (Statistics) ,COMPARATIVE studies ,ENZYME-linked immunosorbent assay ,CHI-squared test ,DESCRIPTIVE statistics ,RESEARCH funding ,EMOTIONAL intelligence ,DATA analysis software - Abstract
Aim: We aimed to reveal the relationship of meditation with emotional intelligence (EI), sleep quality and melatonin level. Design: A cross‐sectional study. Methods: Our current research was performed on middle‐aged women. EI scale, Pittsburgh Sleep Quality Index (PSQI) and night‐time saliva melatonin were measured for 65 participants including 33 meditators and 32 controls. Results: The meditation group showed a significantly higher EI score than the control group. In the regression analysis between EI and age, only the meditation group showed a significant positive correlation. The Pearson correlation analysis among all participants revealed a significant negative correlation between PSQI and EI. There was no significant group difference in the melatonin and PSQI. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
8. In-Depth Relationships between Emotional Intelligence and Personality Traits in Meditation Practitioners
- Author
-
Choi, Soo-Hee, primary, An, Seung Chan, additional, Lee, Ul Soon, additional, Yun, Je-Yeon, additional, Jang, Joon Hwan, additional, and Kang, Do-Hyung, additional
- Published
- 2018
- Full Text
- View/download PDF
9. Effects of an Online Imagery-Based Treatment Program in Patients with Workplace-Related Posttraumatic Stress Disorder: A Pilot Study
- Author
-
Lee, Won Joon, primary, Choi, Soo-Hee, additional, Shin, Jung Eun, additional, Oh, Chang Young, additional, Ha, Na Hyun, additional, Lee, Ul Soon, additional, Lee, Yoonji Irene, additional, Choi, Yoobin, additional, Lee, Saerom, additional, Jang, Joon Hwan, additional, Hong, Yun-Chul, additional, and Kang, Do-Hyung, additional
- Published
- 2018
- Full Text
- View/download PDF
10. A potential association of meditation with menopausal symptoms and blood chemistry in healthy women: A pilot cross-sectional study.
- Author
-
Min-Kyu Sung, Ul Soon Lee, Na Hyun Ha, Koh, Eugene, Hyun-Jeong Yang, Sung, Min-Kyu, Lee, Ul Soon, Ha, Na Hyun, and Yang, Hyun-Jeong
- Published
- 2020
- Full Text
- View/download PDF
11. Effects of Mind-Body Training on Personality and Behavioral Activation and Inhibition System According to BDNF Val66Met Polymorphism
- Author
-
Jung, Ye-Ha, primary, Lee, Ul Soon, additional, Jang, Joon Hwan, additional, and Kang, Do-Hyung, additional
- Published
- 2016
- Full Text
- View/download PDF
12. The effect of meditation on brain structure: cortical thickness mapping and diffusion tensor imaging
- Author
-
Kang, Do-Hyung, primary, Jo, Hang Joon, additional, Jung, Wi Hoon, additional, Kim, Sun Hyung, additional, Jung, Ye-Ha, additional, Choi, Chi-Hoon, additional, Lee, Ul Soon, additional, An, Seung Chan, additional, Jang, Joon Hwan, additional, and Kwon, Jun Soo, additional
- Published
- 2012
- Full Text
- View/download PDF
13. Influence of brain-derived neurotrophic factor and catecholO-methyl transferase polymorphisms on effects of meditation on plasma catecholamines and stress
- Author
-
Jung, Ye-Ha, primary, Kang, Do-Hyung, additional, Byun, Min Soo, additional, Shim, Geumsook, additional, Kwon, Soo Jin, additional, Jang, Go-Eun, additional, Lee, Ul Soon, additional, An, Seung Chan, additional, Jang, Joon Hwan, additional, and Kwon, Jun Soo, additional
- Published
- 2011
- Full Text
- View/download PDF
14. The effects of mind–body training on stress reduction, positive affect, and plasma catecholamines
- Author
-
Jung, Ye-Ha, primary, Kang, Do-Hyung, additional, Jang, Joon Hwan, additional, Park, Hye Yoon, additional, Byun, Min Soo, additional, Kwon, Soo Jin, additional, Jang, Go-Eun, additional, Lee, Ul Soon, additional, An, Seung Chan, additional, and Kwon, Jun Soo, additional
- Published
- 2010
- Full Text
- View/download PDF
15. Influence of brain-derived neurotrophic factor and catechol O-methyl transferase polymorphisms on effects of meditation on plasma catecholamines and stress.
- Author
-
Jung, Ye-Ha, Kang, Do-Hyung, Byun, Min Soo, Shim, Geumsook, Kwon, Soo Jin, Jang, Go-Eun, Lee, Ul Soon, An, Seung Chan, Jang, Joon Hwan, and Kwon, Jun Soo
- Subjects
NEUROTROPHINS ,CATECHOL ,TRANSFERASES ,GENETIC polymorphisms ,PSYCHOLOGICAL stress ,DRUG administration ,MEDITATION ,CATECHOLAMINES - Abstract
Meditation may show differential effects on stress and plasma catecholamines based on genetic polymorphisms in brain-derived neurotrophic factor (BDNF) and catechol O-methyl transferase (COMT). Eighty adults (40 men, 40 women; mean age 26 years) who practiced meditation regularly and 57 healthy control adults (35 men, 22 women; mean age 26 years) participated. Plasma catecholamines (norepinephrine (NE), epinephrine (E), and dopamine (DA)) concentrations were measured, and a modified form of the Stress Response Inventory was administered. The results were analyzed using two-way analysis of covariance (ANCOVA) with control and meditation subjects, gene polymorphism as factors, and meditation duration as the covariate. Two-way ANCOVA showed a significant interaction between control and meditation subjects, and BDNF Val66Met polymorphism on DA/NE++DA/E ( p == 0.042) and NE/E++NE/DA ( p == 0.046) ratios. A significant interaction was found for control and meditation subjects with COMT Val158Met polymorphism and plasma NE concentrations ( p == 0.009). Post hoc ANCOVA in the meditation group, adjusted for meditation duration, showed significantly higher plasma NE concentrations for COMT Met carriers than COMT Val/Val subjects ( p == 0.025). Significant differences of stress levels were found between the control and meditation subjects in BDNF Val/Met ( p < 0.001) and BDNF Met/Met ( p == 0.003), whereas stress levels in the BDNF Val/Val genotype did not differ between the control and meditation groups. This is the first evidence that meditation produces different effects on plasma catecholamines according to BDNF or COMT polymorphisms. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
16. Biocompatibility and dimensional stability through the use of 3D-printed scaffolds made by polycaprolactone and bioglass-7: An in vitro and in vivo study.
- Author
-
Lim HK, Song IS, Choi WC, Choi YJ, Kim EY, Phan THT, and Lee UL
- Abstract
Purpose: This experiment aimed to observe the differences in biological properties by producing BGS-7 + PCL scaffolds with different weight fractions of BGS-7 through 3D printing and to confirm whether using the scaffold for vertical bone augmentation is effective., Materials and Methods: Cube-shaped bioglass (BGS-7) and polycaprolactone (PCL) scaffolds with different weight fractions (PCL alone, PCL with 15% and 30% BGS-7) are produced using 3D printing. The surface hydroxyapatite (HA) apposition, the pH change, proliferation and attachment assays, and various gene expression levels are assessed. After a 7-mm implant was inserted 3 mm into the rabbit calvaria, vertical bone augmentation is performed around the implant and inside the scaffold in four ways: scaffold only, scaffold+bone graft, bone graft only, and no graft. Sacrifice is performed at 6, 12, and 24 weeks, and the various parameters are compared radiographically and histologically., Results: HA apposition, cell proliferation, cell attachment, and expression of osteogenic genes increase as the proportion of BGS-7 increase. In the in vivo test, a higher bone-implant contact ratio, bone volume ratio, bone mineral density, and new bone area are observed when the scaffold and bone grafts were used together., Conclusion: The 3D-printed scaffold, a mixture of BGS-7 and PCL, exhibit higher biological compatibility as the proportion of BGS-7 increase. Additionally, the use of scaffold is effective for vertical bone augmentation., (© 2024 Wiley Periodicals LLC.)
- Published
- 2024
- Full Text
- View/download PDF
17. Erratum to "Vertical augmentation of a severely atrophied posterior mandibular alveolar ridge for a dental implant using a patient-specific 3D printed PCL/BGS7 scaffold: A technical note" [J Stomatol Oral Maxillofac Surg 124 (2022) 101297].
- Author
-
Lee H, Kim EY, and Lee UL
- Published
- 2024
- Full Text
- View/download PDF
18. Relation Between Masticatory Performance and Skeletal Properties in Patients With Skeletal Class III Malocclusion.
- Author
-
Lim HK, Song IS, Park JE, Choi WC, Hwang J, Choi YJ, Kim DK, and Lee UL
- Abstract
This study aimed to measure masticatory performance (MP) using β-carotene gummy jelly to investigate its relationship with skeletal properties in decompensated patients diagnosed with skeletal class III malocclusion. The study included 78 patients (38 men and 40 women) diagnosed with skeletal class III malocclusion without temporomandibular joint disorder and periodontal disease. MP was measured using a new masticatory measuring device and β-carotene in the gummy jelly. Lateral and posteroanterior cephalograms were obtained, and skeletal properties (Me deviation, ANB, SNB, APDI, Wits, ODI, facial axis, body length, ramus length, SN-GoGn, anterior facial height, posterior facial height, saddle angle, articular angle, and gonial angle) were evaluated. MP differences according to age and sex and the effect of skeletal properties on MP were analyzed using multiple linear regression analysis. The MP of all patients was 3690.55±1428.77 mm², MP of the male group was 4043.05±1498.09 mm², and MP of the female group was 3355.68±1272.19 mm². Among the items investigated, the variable that affected MP was posterior facial height. Posterior facial height showed a positive correlation (P=0.022). There was no significant difference between MP and other skeletal properties (P>0.05). The severity of the hypodivergency in skeletal class III could affect MP. The relationship between facial asymmetry or skeletal relation and MP could not be explained in this study., Competing Interests: The authors report no conflicts of interest., (Copyright © 2024 by Mutaz B. Habal, MD.)
- Published
- 2024
- Full Text
- View/download PDF
19. Vertical augmentation of a severely atrophied posterior mandibular alveolar ridge for a dental implant using a patient-specific 3D printed PCL/BGS7 scaffold: A technical note.
- Author
-
Lee H, Kim EY, and Lee UL
- Subjects
- Humans, Dental Implantation, Endosseous methods, Minerals, Alveolar Process, Printing, Three-Dimensional, Dental Implants, Alveolar Ridge Augmentation methods
- Abstract
Vertical bone augmentation for dental implants in the posterior mandibular region with significant bone resorption is challenging. For this purpose, methods such as block bone grafting with screw fixation, particulate bone grafting with titanium mesh or barrier membrane, and distraction osteogenesis have been used, and autogenous block bone grafting is considered the gold standard. However, the autogenous block bone grafting has the following disadvantages: bone harvesting is challenging, and block bone contouring according to the recipient site is time-consuming and laborious. Therefore, in this study, we report the use of particulate bone with a polycaprolactone/bioactive glass-7 scaffold, designed, and three-dimensionally printed preoperatively, to resolve the above-mentioned challenges., Competing Interests: Declaration of Competing Interest None., (Copyright © 2022 Elsevier Masson SAS. All rights reserved.)
- Published
- 2023
- Full Text
- View/download PDF
20. Three-dimensional soft tissue changes after reduction malarplasty in female patients.
- Author
-
Lim HK, Choi YJ, Choi WC, Song IS, and Lee UL
- Subjects
- Humans, Female, Movement, Osteotomy, Body Mass Index, Imaging, Three-Dimensional, Zygoma diagnostic imaging, Zygoma surgery, Plastic Surgery Procedures
- Abstract
The aim of this study was to determine the three-dimensional soft tissue changes after reduction malarplasty. Soft tissue changes relative to the amount of movement of the zygomatic bone were studied. Pre- and postoperative cone beam computed tomography images of 21 female patients were superimposed. The anterior-most point of the body osteotomy (point A), arch osteotomy site (point D), and points dividing line A-D into thirds (points B and C) were marked on lateral view images. The vertical distances from the midsagittal line to the centre of the zygomatic bone and the outer prominence of the soft tissue were measured on the coronal view of each image. The proportion of the change in soft tissue to that of the bone before and after surgery was calculated for each point. The relationship between body mass index and the soft tissue change ratio, and the differences in soft tissue changes at each point were analysed. Mean soft tissue changes for points A, B, C, and D were 53.43%, 66.66%, 63.67%, and 57.23%, respectively. The amount of soft tissue change at point B was greater than that at points A and D, which were osteotomy sites. There was no statistical correlation between body mass index and the soft tissue change ratio at each point., Competing Interests: Competing interests None., (Copyright © 2022 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.)
- Published
- 2022
- Full Text
- View/download PDF
21. Osseointegration of 3D-printed titanium implants with surface and structure modifications.
- Author
-
Lee UL, Yun S, Lee H, Cao HL, Woo SH, Jeong YH, Jung TG, Kim CM, and Choung PH
- Subjects
- Humans, Osteogenesis, Printing, Three-Dimensional, Surface Properties, Titanium chemistry, X-Ray Microtomography, Dental Implants, Osseointegration
- Abstract
Background: The purpose of this study was to establish a mechanical and histological basis for the development of biocompatible maxillofacial reconstruction implants by combining 3D-printed porous titanium structures and surface treatment. Improved osseointegration of 3D-printed titanium implants for reconstruction of maxillofacial segmental bone defect could be advantageous in not only quick osseointegration into the bone tissue but also in stabilizing the reconstruction., Methods: Various macro-mesh titanium scaffolds were fabricated by 3D-printing. Human mesenchymal stem cells were used for cell attachment and proliferation assays. Osteogenic differentiation was confirmed by quantitative polymerase chain reaction analysis. The osseointegration rate was measured using micro computed tomography imaging and histological analysis., Results: In three dimensional-printed scaffold, globular microparticle shape was observed regardless of structure or surface modification. Cell attachment and proliferation rates increased according to the internal mesh structure and surface modification. However, osteogenic differentiation in vitro and osseointegration in vivo revealed that non-mesh structure/non-surface modified scaffolds showed the most appropriate treatment effect., Conclusion: 3D-printed solid structure is the most suitable option for maxillofacial reconstruction. Various mesh structures reduced osteogenesis of the mesenchymal stem cells and osseointegration compared with that by the solid structure. Surface modification by microarc oxidation induced cell proliferation and increased the expression of some osteogenic genes partially; however, most of the markers revealed that the non-anodized solid scaffold was the most suitable for maxillofacial reconstruction., (Copyright © 2022 Elsevier Inc. All rights reserved.)
- Published
- 2022
- Full Text
- View/download PDF
22. Four Different Reasons of Subcutaneous Emphysema With or Without Pneumomediastinum and Pneumothorax After Facial Bone Surgery.
- Author
-
Choung HW, Choi YJ, Kang H, and Lee UL
- Subjects
- Facial Bones, Humans, Intubation, Intratracheal adverse effects, Mediastinal Emphysema diagnostic imaging, Mediastinal Emphysema etiology, Mediastinal Emphysema therapy, Pneumothorax diagnostic imaging, Pneumothorax etiology, Pneumothorax therapy, Subcutaneous Emphysema diagnostic imaging, Subcutaneous Emphysema etiology, Subcutaneous Emphysema therapy
- Abstract
Abstract: In the present study, the authors report rare case series with subcutaneous emphysema with or without pneumomediastinum and pneumothorax after orthognathic and facial bone contouring surgery, compare their clinical and radiologic findings, and suggest precautions. Four patients who showed subcutaneous emphysema on follow up chest X-ray and computed tomography after orthognathic and facial bone contouring surgery were included in the study. In all cases post-op subcutaneous emphysema were detected, however, the aspect and mechanisms of post-op air spread were all different. After the conservative management with administering the O 2 by nasal cannula or endotracheal tube, the symptoms were relieved except 1 patient who needed chest tube insertion and further supra-sternal incision. In conclusion, subcutaneous emphysema with or without pneumomediastinum and pneumothorax after orthognathic and facial bone contouring surgery can be occurred by cervical fascia injury or alveolar ruptures. To preventing those complications, traumatic naso-tracheal intubation, excessive positive pressure ventilation, intermaxillary fixation immediate after the surgery, and increase of intra-alveolar pressure of the patients should be avoided., Competing Interests: The authors report no conflicts of interest., (Copyright © 2022 by Mutaz B. Habal, MD.)
- Published
- 2022
- Full Text
- View/download PDF
23. Zygoma Augmentation With 3D Printed Bioactive Glass-Ceramic Implant.
- Author
-
Jo H and Lee UL
- Subjects
- Ceramics pharmacology, Humans, Osteoblasts, Printing, Three-Dimensional, Dental Implants, Zygoma diagnostic imaging, Zygoma surgery
- Abstract
Abstract: Zygoma, which is located at the middle third of the face, has a significant impact on the facial impression with its volume and prominence. CaO-SiO 2 -P 2 O 5 -B 2 O 3 glass-ceramics (BGS-7) has been reported as a new alternative of nonresorbable bone grafting material, which has bioactivity of inducing human osteoblast between bone and implant, resulting integration to the bone. Furthermore, its chemical characteristics are similar to bone, resulting in radiopacity with no metallic artifact on the radiographic images. With the development of Computer aided design-Computer aided manufacturing technology, BGS-7 can be manufactured into a patient-specific design.During follow-up periods, 3D printed BGS-7 implant did not displace from the initial recipient site. By cone-beam computed tomography evaluation, a gap between bone and BGS-7 was filled with the radiopacity, which implied bony fusion. Consequently, this clinical case shows that the BGS-7 implant could be an effective and safe graft material for zygoma bone defects., Competing Interests: The authors report no conflicts of interest., (Copyright © 2021 by Mutaz B. Habal, MD.)
- Published
- 2022
- Full Text
- View/download PDF
24. Reconstruction of maxillofacial bone defects using patient-specific long-lasting titanium implants.
- Author
-
Lim HK, Choi YJ, Choi WC, Song IS, and Lee UL
- Subjects
- Humans, Mandible surgery, Prostheses and Implants, Retrospective Studies, Plastic Surgery Procedures methods, Titanium
- Abstract
The objective of this retrospective study is to verify the effectiveness and safety of patient-specific titanium implants on maxillofacial bones, with a long-term follow-up. Total 16 patients with various maxillofacial defects underwent reconstruction using patient-specific titanium implants. Titanium implants, manufactured by electron beam melting, selective laser sintering, or milling, were inserted into the maxilla, mandible, or zygoma. Long-term follow-up (36.7 ± 20.1 months) was conducted after the surgery. Bone fusion of the titanium implant body, postoperative infection, implant malunion, functional results, patient satisfaction, subsidence, osteolysis around the implants, and complications were recorded and analyzed at the last follow-up. Of the 28 implants, only one failed to unite with the bone; therefore, revision surgery was performed. No osteolysis or subsidence around the titanium implants nor adverse events were observed; the mean VAS score for satisfaction was 9. All patients enrolled in this trial were esthetically and functionally satisfied with their surgical results, and fixation failure and esthetic dissatisfaction complications were well resolved. Patient-specific titanium showed satisfactory outcomes when used to treat various oral and maxillofacial defects. A 3D printed titanium implant can be effectively used in the reconstruction of the zygoma and mandible instead of autogenous bone without donor site morbidity., (© 2022. The Author(s).)
- Published
- 2022
- Full Text
- View/download PDF
25. A new rationale for preservation of the mandibular third molar in orthognathic patients with missing molars.
- Author
-
Baik UB, Kim YJ, Chae HS, Park JU, Julian S, Sugawara J, and Lee UL
- Abstract
Controversies exist regarding the need for prophylactic extraction of mandibular third molars in patients who plan to undergo orthognathic surgery. An 18-year-old male patient was diagnosed with mandibular prognathism and maxillary retrognathism with mild facial asymmetry. He had a severely damaged mandibular first molar and a horizontally impacted third molar. After extraction of the first molar, the second molar was protracted into the first molar space, and the third molar erupted into the posterior line of occlusion. The orthognathic surgery involved clockwise rotation of the maxillomandibular complex as well as angle shaving and chin border trimming. Patients who are missing or have damaged mandibular molars should be monitored for eruption of third molars to replace the missing posterior tooth regardless of the timing of orthognathic surgery.
- Published
- 2022
- Full Text
- View/download PDF
26. A Novel Device for Blood Drainage after Le Fort I Osteotomy: Maxillary Sinus Ventilation Drainage (MSVD).
- Author
-
Lee UL, Jang HW, Choung HW, Lee SY, and Choi YJ
- Abstract
The purpose of this study is to present a novel maxillary sinus ventilation drainage (MSVD) device which facilitates blood drainage and nasal breathing after Le Fort I osteotomy. One hundred patients who underwent bimaxillary orthognathic surgery from January 2016 to June 2016 at the Department of Oral and Maxillofacial Surgery, Chung-Ang University Hospital were retrospectively selected and divided into two groups. MSVD was applied in 50 patients, who were allocated to the MSVD group, while the remaining 50 patients, in whom MSVD was not applied, were allocated to the non-MSVD group. All patients underwent a cone-beam computed tomography (CBCT) scan before and 2 days after surgery. CBCT was used to analyze middle meatus patency and the percentage of hematoma volume per entire maxillary sinus volume. Statistical comparisons between the two groups were performed using the Chi-squared and Mann-Whitney U tests to investigate the clinical effectiveness of MSVD. The MSVD group showed significantly higher maintenance ratio of the middle meatus patency and a higher percentage of maxillary sinus air volume ( p < 0.05) than the non-MSVD group. MSVD facilitated nasal breathing after Le Fort I osteotomy by reducing hematoma inside the maxillary sinus and promoting middle meatal patency.
- Published
- 2022
- Full Text
- View/download PDF
27. The COVID Cancer Effect.
- Author
-
McFarling UL
- Published
- 2021
- Full Text
- View/download PDF
28. Bone Conduction Capacity of Highly Porous 3D-Printed Titanium Scaffolds Based on Different Pore Designs.
- Author
-
Lim HK, Ryu M, Woo SH, Song IS, Choi YJ, and Lee UL
- Abstract
In porous titanium scaffolds manufactured via 3D printing, the differences in bone formation according to pore design and implantation period were studied. Titanium scaffolds with three types of different pore structures (Octadense, Gyroid, and Dode) were fabricated via 3D printing using the selective laser melting method. Mechanical properties of scaffolds were investigated. Prepared specimens were inserted into both femurs of nine rabbits and their clinical characteristics were observed. Three animals were sacrificed at the 2nd, 4th, and 6th weeks, and the differences in bone formation were radiologically and histologically analyzed. The percentage of new bone and surface density in the pore structure were observed to be approximately 25% and 8 mm
2 /mm3 , respectively. There was no difference in the amount of newly formed bone according to the pore design at 2, 4, and 6 weeks. In addition, no differences in the amount of newly formed bone were observed with increasing time within the same pore design for all three designs. During the 6-week observation period, the proportion of new bones in the 3D-printed titanium scaffold was approximately 25%. Differences in bone formation according to the pore design or implantation period were not observed.- Published
- 2021
- Full Text
- View/download PDF
29. Temporomandibular joint morphology in Korean using cone-beam computed tomography: influence of age and gender.
- Author
-
Yun JM, Choi YJ, Woo SH, and Lee UL
- Abstract
Objectives: The purpose of this study was to investigate the condylar morphology and position of Koreans using cone-beam computed tomography (CBCT) images. Analyzing the mean values of this study with reference to left and right sides, gender, and age will help to understand the size of the condyle and glenoid fossa, condylar morphology, and temporomandibular joint (TMJ) symmetry for establishing the standard temporomandibular joint structures of Koreans and then design the standard temporomandibular joint prosthesis for Koreans., Results: There was no significant result in the condyle size, condyle axis angle, joint space, fossa depth, and mandibular body size between the left and right sides (p > 0.05). On the other hand, the mediolateral width of the condyle and mandibular body size show significantly different with the gender (P < 0.05). Also, significant differences were found in condyle size, joint space, fossa depth, and mandibular body size according to age groups (p < 0.05)., Conclusions: Condylar position and morphology vary according to side, age, and gender. The results of this study are expected to help in customizing a treatment for the patients who need TMJ reconstruction by predicting the TMJ morphology according to age and gender and design the standard temporomandibular joint prosthesis for the Koreans.
- Published
- 2021
- Full Text
- View/download PDF
30. Pre-contoured reconstruction plate fabricated via three-dimensional printed bending support.
- Author
-
Song IS, Ryu JJ, Choi YJ, and Lee UL
- Abstract
A mandibular continuity defect can be repaired using either a prosthetic device or autogenous bone. A titanium reconstruction plate can be used with a localized or vascularized flap over the defect of the mandible. Unfortunately, the plate may fail due to plate exposure, screw loosening, fracture, or infection, and will need to be removed. Plate exposure though the skin or mucosa is one of the main reasons for failure. In the present work, the authors introduced a lingually positioned reconstruction plate fabricated via three-dimensional printed bending support. This custom reconstruction plate can avoid plate re-exposure as well as reduce surgical errors and operation time.
- Published
- 2021
- Full Text
- View/download PDF
31. Bioprinting on 3D Printed Titanium Scaffolds for Periodontal Ligament Regeneration.
- Author
-
Lee UL, Yun S, Cao HL, Ahn G, Shim JH, Woo SH, and Choung PH
- Subjects
- Adolescent, Adult, Animals, Humans, Male, Proteins, Rats, Regeneration, Titanium, Young Adult, Bioprinting methods, Periodontal Ligament, Printing, Three-Dimensional, Stem Cells cytology, Tissue Engineering methods, Tissue Scaffolds
- Abstract
The three-dimensional (3D) cell-printing technique has been identified as a new biofabrication platform because of its ability to locate living cells in pre-defined spatial locations with scaffolds and various growth factors. Osseointegrated dental implants have been regarded as very reliable and have long-term reliability. However, host defense mechanisms against infections and micro-movements have been known to be impaired around a dental implant because of the lack of a periodontal ligament. In this study, we fabricated a hybrid artificial organ with a periodontal ligament on the surface of titanium using 3D printing technology. CEMP-1, a known cementogenic factor, was enhanced in vitro. In animal experiments, when the hybrid artificial organ was transplanted to the calvarial defect model, it was observed that the amount of connective tissue increased. 3D-printed hybrid artificial organs can be used with dental implants, establishing physiological tooth functions, including the ability to react to mechanical stimuli and the ability to resist infections.
- Published
- 2021
- Full Text
- View/download PDF
32. A Clinical Trial to Evaluate the Efficacy and Safety of 3D Printed Bioceramic Implants for the Reconstruction of Zygomatic Bone Defects.
- Author
-
Lee UL, Lim JY, Park SN, Choi BH, Kang H, and Choi WC
- Abstract
The purpose of this study was to evaluate the clinical efficacy and safety of patient-specific additive-manufactured CaOSiO
2 -P2 O5 -B2 O3 glass-ceramic (BGS-7) implants for reconstructing zygomatic bone defects at a 6-month follow-up. A prospective, single-arm, single-center, clinical trial was performed on patients with obvious zygoma defects who needed and wanted reconstruction. The primary outcome variable was a bone fusion between the implant and the bone evaluated by computed tomography (CT) at 6 months post surgery. Secondary outcomes, including implant immobilization, satisfaction assessment, osteolysis, subsidence of the BGS-7 implant, and safety, were assessed. A total of eight patients were enrolled in the study. Two patients underwent simultaneous reconstruction of the left and right malar defects using a BGS-7 3D printed implant. Cone beam CT analysis showed that bone fusion at 6 months after surgery was 100%. We observed that the average fusion rate was 76.97%. Osteolysis around 3D printed BGS-7 implants was not observed. The mean distance displacement of all 10 implants was 0.4149 mm. Our study showed no adverse event in any of the cases. The visual analog scale score for satisfaction was 9. All patients who enrolled in this trial were aesthetically and functionally satisfied with the surgical results. In conclusion, this study demonstrates the safety and promising value of patient-specific 3D printed BGS-7 implants as a novel facial bone reconstruction method.- Published
- 2020
- Full Text
- View/download PDF
33. Soft tissue expander for vertically atrophied alveolar ridges: Prospective, multicenter, randomized controlled trial.
- Author
-
Byun SH, Kim SY, Lee H, Lim HK, Kim JW, Lee UL, Lee JB, Park SH, Kim SJ, Song JD, Jang IS, Kim MK, and Kim JW
- Subjects
- Alveolar Process, Bone Regeneration, Bone Transplantation, Dental Implantation, Endosseous, Humans, Prospective Studies, Tissue Expansion, Alveolar Ridge Augmentation, Tissue Expansion Devices
- Abstract
Objectives: Conventional guided bone regeneration (GBR) limits the amount of bone graft due to limited soft tissue expansion. We hypothesize that the use of tissue expander will successfully augment soft tissue prior to bone graft, allowing for sufficient amount of grafting which will lead to a more stable and effective vertical bone graft. The authors aimed to evaluate effectiveness of the novel self-inflating tissue expander for vertical augmentation in terms of soft tissue expansion, clinical outcomes, and related complications., Material and Methods: A prospective, multicenter, randomized controlled trial was performed on patients requiring vertical augmentation. For experimental group patients, the tissue expander was subperiosteally implanted and followed by a tunneling bone graft without full flap reflection. Control patients underwent conventional vertical GBR. Primary objectives were to evaluate the dimensional changes of soft tissue and radiographic vertical bone gain and retention. As a secondary outcome, clinical complications and thickness changes of expanded overlying tissue were assessed and analyzed., Results: Twenty-three patients in each group were included. During a 4-week expansion, two of the experimental group showed over-expansion and one showed mucosal perforation associated with previous severe scars. The other patients showed uneventful expansion and mean tissue augmentation was 6.88 ± 1.64 mm vertically. Ultrasonographic measurements of overlying gingiva revealed no thinning after tissue expansion (p > .05). Significantly higher vertical bone gain was shown in the experimental group (5.12 ± 1.25 mm) compared with that in the control patients (4.22 ± 1.15 mm; p < .05). After a 6-month retention period, the mean vertical bone measurement of the controls had decreased to 1.90 mm (55.0% reduction), which was a significantly greater decrease than that in the experimental group (mean 3.55 mm, 30.7% reduction; p < .05)., Conclusion: Our results demonstrated the effectiveness of tissue expanders followed by tunneling bone graft for vertical augmentation; however, studies comparing the two techniques without tissue expanders are needed to elucidate the net effect of tissue expansion., (© 2020 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.)
- Published
- 2020
- Full Text
- View/download PDF
34. Tissue Expansion Improves the Outcome and Predictability for Alveolar Bone Augmentation: Prospective, Multicenter, Randomized Controlled Trial.
- Author
-
Byun SH, Kim SH, Cho S, Lee H, Lim HK, Kim JW, Lee UL, Song W, Kim SJ, Kim MK, and Kim JW
- Abstract
Objectives: The purpose of this study was to evaluate the effectiveness of the intraoral use of subperiosteally placed self-inflating tissue expanders for subsequent bone augmentation and implant integrity., Material and Methods: A prospective, multicenter, randomized controlled trial was performed on patients requiring alveolar bone graft for dental implant insertion. Patients were assigned to three groups: tissue expansion and tunneling graft (TET group), tissue expansion and conventional bone graft (TEG), and control group without tissue expansion. Dimensional changes of soft tissue and radiographic vertical bone gain, retention, and peri-implant marginal bone changes were evaluated and secondary outcomes; clinical complications and thickness changes of expanded overlying tissue were assessed., Results: Among 75 patients screened, a total of 57 patients were included in the final analysis. Most patients showed uneventful soft tissue expansion without any inflammatory sign or symptoms. Ultrasonographic measurements of overlying gingiva revealed no thinning after tissue expansion ( p > 0.05). Mean soft vertical and horizontal tissue measurements at the end of its expansion were 5.62 and 6.03 mm, respectively. Significantly higher vertical bone gain was shown in the TEG (5.71 ± 1.99 mm) compared with that in the control patients (4.32 ± 0.97 mm; p < 0.05). Hard tissue retention- measured by bone resorption after 6 months-showed that control group showed higher amount of vertical (2.06 ± 1.00 mm) and horizontal bone resorption (1.69 ± 0.81 mm) compared to that of the TEG group ( p < 0.05)., Conclusion: The self-inflating tissue expander effectively augmented soft tissue volume and both conventional bone graft and tunneling techniques confirmed their effectiveness in bone augmentation. With greater amount of bone gain and better 6 month hard tissue integrity, the TEG group compared to the control group-without tissue expansion-showed that the combined modality of tissue expander use and guided bone regeneration (GBR) technique may improve the outcome and predictability of hard tissue augmentation.
- Published
- 2020
- Full Text
- View/download PDF
35. Factors associated with spontaneous mesialization of impacted mandibular third molars after second molar protraction.
- Author
-
Baik UB, Kang JH, Lee UL, Vaid NR, Kim YJ, and Lee DY
- Subjects
- Adolescent, Adult, Female, Humans, Male, Molar, Radiography, Panoramic, Young Adult, Mandible diagnostic imaging, Molar, Third diagnostic imaging, Tooth, Impacted
- Abstract
Objectives: To investigate factors associated with spontaneous mesialization of impacted third molars after second molar protraction to close the space caused by a missing mandibular first molar (L-6) or retained deciduous mandibular second molars with a missing succedaneous premolar (L-E)., Materials and Methods: Panoramic radiographs of patients treated with mandibular second molar protraction to close the space due to missing L-6 or L-E (14 males, 36 females, mean age = 18.6 ± 4.4 years) were analyzed before treatment (T1) and after second molar protraction (T2). Factors associated with the amount of third molar mesialization were investigated using regression analyses., Results: Mandibular second molars were protracted by 5.1 ± 2.1 mm and 5.8 ± 2.7 mm, measured at the crown and root furcation, respectively. After second molar protraction, third molars showed spontaneous mesialization by 4.3 ± 1.6 mm and 3.8 ± 2.6 mm, measured at the crown and root furcation, respectively. Nolla's stage of the third molar at T1 (B = 0.20, P = .026) and second molar protraction time (B = 0.04, P = .042) were significantly associated with the amount of third molar mesialization., Conclusions: Greater third molar mesialization was observed when Nolla's stage of the third molar was higher before treatment and when the second molar protraction time was longer.
- Published
- 2020
- Full Text
- View/download PDF
36. Comparison of Lip Line Cant Change After 1-Jaw and 2-Jaw Surgery.
- Author
-
Lee UL, Nam JH, Choi WC, Kim HW, Kim HJ, and Choi YJ
- Subjects
- Cephalometry, Cone-Beam Computed Tomography, Dental Occlusion, Facial Asymmetry surgery, Female, Humans, Lip anatomy & histology, Male, Malocclusion, Angle Class III surgery, Mandible surgery, Maxilla surgery, Orthognathic Surgical Procedures, Malocclusion, Angle Class III diagnostic imaging, Mandible diagnostic imaging, Maxilla diagnostic imaging
- Abstract
Objectives: The purpose of this study was to compare the lip line cant (LLC) changes after 1 and 2-jaw surgery, and to evaluate the correlations of the craniofacial factors affecting LLC., Methods: The study subjects were selected (LLC amount within 1.5-6.0°) from among the patients diagnosed with Class III malocclusion who underwent one (n = 20) or 2-jaw surgery (n = 20). Cone beam computed tomography images were obtained immediately before the operation (T1) and 6 months after the operation (T2). Preoperative and postoperative craniofacial measurements were obtained., Results: The study subjects showed 3.12° LLC on average before undergoing 1-jaw surgery, and their LLC changed to 1.27° after the surgery. As for 2-jaw surgery, the subjects showed 3.38° LLC on average before the surgery and 0.98° after the surgery. LLC at pre-treatment may be more affected by a cant of the occlusal plane in the mandible than maxilla. In the comparison of the value of changes of LLC, the value of 2-jaw surgery was bigger than the value of 1-jaw surgery but the difference was statistically insignificant., Limitations: This study had a limitation in that the muscles were not considered. And the metal bracket or metal crown and bridge, however, can cause noise and blurring artifacts in CT, which can lead to a low resolution. And the limited number of the patients should be considered., Conclusions: In correlation analysis, both pre-surgery LLC and change of LLC have correlation with almost all the craniofacial measurement. Lip-line cant of patients with facial asymmetry has higher correlation with mandibular cant than with other cants. To improve the LLC, a surgical plan should be established to minimize the mandibular cant using the computer simulation as well as the maxillary cant.
- Published
- 2019
- Full Text
- View/download PDF
37. Factors associated with spontaneous angular changes of impacted mandibular third molars as a result of second molar protraction.
- Author
-
Baik UB, Bayome M, Abbas NH, Park JH, Lee UL, and Kim YJ
- Subjects
- Adolescent, Adult, Anatomic Landmarks, Bicuspid, Female, Humans, Male, Malocclusion diagnostic imaging, Mandible anatomy & histology, Mandible diagnostic imaging, Molar anatomy & histology, Molar diagnostic imaging, Molar physiopathology, Molar, Third anatomy & histology, Molar, Third diagnostic imaging, Orthodontic Appliances, Orthodontic Space Closure, Orthodontics, Corrective, Tooth Eruption, Tooth, Deciduous, Tooth, Impacted complications, Tooth, Impacted diagnostic imaging, Young Adult, Malocclusion physiopathology, Malocclusion prevention & control, Mandible physiopathology, Molar, Third physiopathology, Tooth, Impacted physiopathology
- Abstract
Introduction: This study aimed to identify significant factors affecting the spontaneous angular changes of impacted mandibular third molars as a result of second molar protraction. Temporary skeletal anchorage devices in the missing mandibular first molar (ML-6) or missing deciduous mandibular second molar (ML-E) with missing succedaneous premolar spaces provided traction., Methods: Forty-one mandibular third molars of 34 patients (10 male and 24 female; mean age 18.3 ± 3.7 years) that erupted after second molar protraction were included in this study. They were classified into upright (U) and tilted (T) groups. Linear and angular measurements were performed at the time of treatment initiation (T1) and of ML-6 or ML-E space closure (T2). Regression analyses were used to identify significant factors related to third molar uprighting., Results: Nolla stage (odds ratio [OR] 4.1), sex (OR 0.003 for male), third molar angulation at T1 (OR 1.1), missing tooth space (OR 0.006), rate of third molar eruption (OR 23.3), and rate of second molar protraction (OR 0.2) significantly affected third molar uprighting. Age, third molar angulation at T1, rate of third molar eruption, and rate of second molar protraction were significant factors for predicting third molar angulation at T2., Conclusions: Available space for third molar eruption before and after second molar protraction is not associated with uprighting of erupting third molars. Older patients whose third molars are in greater Nolla stage, are in a more upright position at T1, and have a greater eruption rate have a greater chance for third molar uprighting. Alternatively, an increase in second molar protraction rate results in mesial tipping of the third molars., (Copyright © 2019 American Association of Orthodontists. Published by Elsevier Inc. All rights reserved.)
- Published
- 2019
- Full Text
- View/download PDF
38. Recovery pattern following bimaxillary orthognathic surgery: Differences between sexes.
- Author
-
Song IS, Choi J, Baik UB, Ryu JJ, Lim JW, Choi YJ, and Lee UL
- Subjects
- Adult, Female, Humans, Male, Maxillary Osteotomy, Nasal Obstruction surgery, Osteotomy, Postoperative Complications psychology, Sex Factors, Surveys and Questionnaires, Young Adult, Zygoma surgery, Maxilla surgery, Orthognathic Surgery methods, Orthognathic Surgical Procedures methods
- Abstract
The investigators hypothesized there would be differences between the sexes in recovery pattern following bimaxillary orthognathic surgery as measured by patient responses at 5 weeks postprocedure. A total of 378 participants underwent bimaxillary orthognathic surgery with or without adjunctive procedures. Participants received questionnaires 5 weeks postsurgery when they visited the outpatient clinic. The questionnaires include variances in surgical factors by sex, and postoperative symptoms which were most difficult to tolerate experiences by sex, respectively. Females were more likely to undergo malarplasty (zygoma reduction) than were male participants (P = <.001), and they required larger maxillary setback than did male participants (P = .003). Malarplasty was significantly correlated with ear fullness in total and female participants (p-value .018, .016, respectively). Snoring is significantly associated with malarplasty and segment osteotomy procedure without gender predominance (p-value = .026, .028, respectively). Over half of participants complained of nasal congestion (55.6%), followed by swelling (29.3%), pain (15.4%), breathing difficulty (10.6%). In conclusion, males and females showed different patterns of postoperative recovery following bimaxillary orthognathic surgery., (Copyright © 2018 European Association for Cranio-Maxillo-Facial Surgery. Published by Elsevier Ltd. All rights reserved.)
- Published
- 2019
- Full Text
- View/download PDF
39. Orthognathic surgery Deteriorates the osseointegration of dental implants: A propensity-matched multicentre cohort study.
- Author
-
Kim JW, Lee H, Lim HK, Kim JW, Byun SH, Choi YJ, and Lee UL
- Subjects
- Adult, Dental Implants, Dental Stress Analysis, Female, Humans, Male, Orthognathic Surgery, Propensity Score, Young Adult, Alveolar Bone Loss physiopathology, Osseointegration physiology
- Abstract
This study aimed to investigate the possible influence of the regional acceleratory phenomenon (RAP) on dental implant osseointegration. Orthognathic surgery was set as an intervention for RAP, and a multicentre cohort study of two groups was undertaken. Group O included patients with single implant placement at least 4 months after orthognathic surgery and functional loading for more than 1 year, while controls (Group C) were without any major surgery. Clinical and radiographic assessments of implants, including changes in marginal bone levels, were analysed at baseline, 6- and 12-month follow-up. Bivariate analysis of two groups with propensity score matching was performed. After propensity score matching, all 10 confounding variables had acceptable standardised difference scores (<20%), indicating that the matching procedure had efficiently balanced the two groups. Following the propensity score adjustment, the marginal bone loss was significantly higher in Group O than the control at 6 months (1.66 ± 1.05 mm vs 0.59 ± 0.64 mm, P < 0.001) and 12 months (2.30 ± 1.27 mm vs 0.82 ± 0.78 mm, P < 0.001). Compared to Group C, subjects in Group O had a higher incidence of peri-implant mucositis and implantitis (11.8% vs 1.5%, P = 0.033). Impaired osseointegration of dental implants was associated with orthognathic surgery. Special considerations for peri-implant soft and hard tissue stability should be addressed to obtain ideal treatment results and prognosis for patients who have had prior orthognathic surgery., (© 2018 John Wiley & Sons Ltd.)
- Published
- 2018
- Full Text
- View/download PDF
40. Cleft Alveolus Reconstruction Using a Three-Dimensional Printed Bioresorbable Scaffold With Human Bone Marrow Cells.
- Author
-
Ahn G, Lee JS, Yun WS, Shim JH, and Lee UL
- Subjects
- Alveolar Process diagnostic imaging, Bone Regeneration, Child, Humans, Male, Maxilla surgery, Mesenchymal Stem Cells, Polyesters, Printing, Three-Dimensional, Tissue Engineering methods, Absorbable Implants, Alveolar Process abnormalities, Alveolar Process surgery, Mesenchymal Stem Cell Transplantation, Tissue Scaffolds
- Abstract
Bone tissue engineering technology based on scaffold has been applied for cleft lip and palate treatment. However, clinical applications of patient-specific three-dimensional (3D) scaffolds have rarely been performed. In this study, a clinical case using patient-specific 3D-printed bioresorbable scaffold with bone marrow stromal cells collected from iliac crest in the operating room has been introduced. At 6-month after transplantation, the bone volume of the newly regenerated bone was approximately 45% of the total defect volume. Bone mineral density of the newly regenerated bone was about 75% compared to the surrounding bone. The Hounsfield unit value was higher than that of cancellous maxillary alveolar bone and lower than that of the cortical maxillary alveolar bone. Bone-marrow-derived mesenchymal stem cells-seeded 3D-printed patient-specific polycaprolactone scaffolds offer a promising alternative for alveolar cleft reconstruction and other bony defects.
- Published
- 2018
- Full Text
- View/download PDF
41. Occlusion-Fit Three-Dimensional-Printed Zygoma Repositioner.
- Author
-
Cho J, Kwon JS, and Lee UL
- Subjects
- Dental Occlusion, Facial Asymmetry surgery, Humans, Reoperation, Treatment Outcome, Printing, Three-Dimensional, Plastic Surgery Procedures instrumentation, Plastic Surgery Procedures methods, Surgery, Computer-Assisted instrumentation, Surgery, Computer-Assisted methods, Zygoma surgery
- Abstract
Reduction malarplasty is utilized to reshape the facial form into an oval shape. However, complications and unfavorable results in reduction malarplasty have been reported. Reoperation of a nonunion malar complex is difficult relative to the achievement of a satisfactory outcome using the intraoral approach with a narrow surgical field because the normal anatomy has been destroyed, and previous surgery may have caused asymmetry. In this situation, computer-aided simulation surgery and surgical guides can serve as effective solutions to overcome the limitations of reoperative malarplasty using the intraoral approach.In this report, the authors present a case with successful treatment outcomes for a nonunion malar complex using a three-dimensional-printed zygoma repositioner.
- Published
- 2018
- Full Text
- View/download PDF
42. Reconstruction of a Severely Atrophied Alveolar Ridge by Computer-Aided Gingival Simulation and 3D-Printed Surgical Guide: A Case Report.
- Author
-
Song IS, Lee MR, Ryu JJ, and Lee UL
- Subjects
- Female, Gingiva surgery, Humans, Maxilla surgery, Middle Aged, Osteotomy methods, Printing, Three-Dimensional, Treatment Outcome, Alveolar Ridge Augmentation methods, Computer-Aided Design, Dental Implantation, Endosseous methods, Dental Prosthesis, Implant-Supported methods
- Abstract
Dental implants positioned in severely atrophied anterior maxillae require esthetic or functional compromises. This case report describes the rehabilitation of a severely atrophied alveolar ridge with a three-dimensional (3D) computer-aided design/computer-aided manufacture (CAD/CAM) surgical guide. A 50-year-old woman had a severely atrophied anterior maxilla with unfavorably positioned dental implants. Functional and esthetic prosthodontic restoration was difficult to achieve. An anterior segmental osteotomy was planned to reposition the dental implants. A 3D surgical guide was designed for precise relocation of the segment. The surgical guide firmly grasped the impression copings of the dental implants, minimizing surgical errors. Three-dimensional gingival simulation was used preoperatively to estimate the appropriate position of the gingiva. Rigid fixation to the surrounding bone allowed immobilization of the implant-bone segment. Satisfactory esthetic and functional outcomes were attained 6 months after surgery. Finally, a severely atrophied alveolar ridge with unfavorably positioned dental implants was recovered with minimal esthetic and functional deterioration using gingival simulation and a 3D CAD/CAM surgical guide.
- Published
- 2018
- Full Text
- View/download PDF
43. Correction to: The structural changes of pharyngeal airway contributing to snoring after orthognathic surgery in skeletal class III patients.
- Author
-
Park JE, Bae SH, Choi YJ, Choi WC, Kim HW, and Lee UL
- Abstract
[This corrects the article DOI: 10.1186/s40902-017-0120-6.].
- Published
- 2018
- Full Text
- View/download PDF
44. The structural changes of pharyngeal airway contributing to snoring after orthognathic surgery in skeletal class III patients.
- Author
-
Park JE, Bae SH, Choi YJ, Choi WC, Kim HW, and Lee UL
- Abstract
Background: Two-jaw surgery including mandibular and maxillary backward movement procedures are commonly performed to correct class III malocclusion. Bimaxillary surgery can reposition the maxillofacial bone together with soft tissue, such as the soft palate and the tongue base. We analyzed changes of pharyngeal airway narrowing to ascertain clinical correlations with the prevalence of snoring after two-jaw surgery., Methods: A prospective clinical study was designed including a survey on snoring and three-dimensional (3D) computed tomography (CT) in class III malocclusion subjects before and after bimaxillary surgery. We conducted an analysis on changes of the posterior pharyngeal space find out clinical correlations with the prevalence of snoring., Results: Among 67 subjects, 12 subjects complained about snoring 5 weeks after the surgical correction, and examining the 12 subjects after 6 months, 6 patients complained about the snoring. The current findings demonstrated the attenuation of the largest transverse width (LTW), anteroposterior length (APL), and cross-sectional area (CSA) following bimaxillary surgery given to class III malocclusion patients, particularly at the retropalatal level. The average distance of maxillary posterior movements were measured to be relatively higher (horizontal distance 3.9 mm, vertical distance 2.6 mm) in case of new snorers., Conclusions: This study found that bimaxillary surgery could lead to the narrowing of upper airway at the retropalatal or retroglossal level as well as triggering snoring in subjects with class III malocclusion. Based on the current clinical findings, we also found that upper airway narrowing at retropalatal level may contribute to increasing the probability of snoring and that polysonography may need to be performed before orthognathic surgery in subjects with class III malocclusion.
- Published
- 2017
- Full Text
- View/download PDF
45. Risk Factor Analysis of Graft Failure With Concomitant Cyst Enucleation of the Jaw Bone: A Retrospective Multicenter Study.
- Author
-
Lim HK, Kim JW, Lee UL, Kim JW, and Lee H
- Subjects
- Adult, Age Factors, Bacterial Infections etiology, Case-Control Studies, Female, Follow-Up Studies, Humans, Male, Middle Aged, Republic of Korea, Retrospective Studies, Risk Factors, Statistics as Topic, Bone Transplantation, Graft Rejection etiology, Jaw Diseases surgery, Odontogenic Cysts surgery, Postoperative Complications etiology
- Abstract
Purpose: Cysts are common pathologic entities in the oral and maxillofacial region. Enucleation is commonly used for treatment and is occasionally followed by bone grafting. However, no studies have evaluated factors affecting the failure of grafts used for cystic defects in the oral and maxillofacial region. Therefore, the present study was conducted to determine the risk factors for postoperative graft failure in patients treated with cyst enucleation and simultaneous bone grafting., Materials and Methods: Clinical data for 305 patients who had undergone cyst enucleation with simultaneous bone grafting were retrospectively investigated in this multicenter case-and-control study. The predictor variables included host, pathologic, and treatment factors. The outcome variable was success or failure of the bone graft. Descriptive statistics were computed, and the P value was set at .05., Results: Bone graft failure was observed in 48 cases. The mean duration from surgery to failure was 38.7 days. Multivariable logistic regression analysis showed a significant association between graft failure and younger age (odds ratio [OR] = 1.033; P = .016), smoking (OR = 2.598; P = .017), preoperative infection (OR = 4.660; P = .001), large cysts (OR = 1.052; P = .010), impaction of the mandibular third molar in the cystic cavity (OR = 3.021; P = .007), perilesional osteosclerosis (OR = 4.973; P = .001), and the use of mixed non-autogenous and autogenous bone grafts (OR = 3.891; P = .007)., Conclusions: This study provides a list of important factors that should be considered by clinicians planning enucleation and simultaneous bone grafting for cysts in the oral and maxillofacial region., (Copyright © 2017 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.)
- Published
- 2017
- Full Text
- View/download PDF
46. A three-dimensional planned osteotomy on the zygomatic arch for reduction malarplasty.
- Author
-
Kim HL, Kwon JS, Choi YJ, and Lee UL
- Subjects
- Adult, Esthetics, Female, Humans, Imaging, Three-Dimensional, Male, Plastic Surgery Procedures, Tomography, X-Ray Computed, Asian People, Osteotomy methods, Zygoma surgery
- Abstract
During a reduction malarplasty, precise sectioning of the zygomatic arch according to the plan formulated in the diagnostic stage is very important, because differences in the locations of the osteotomies in the left and right zygomatic arch will result in facial asymmetry, and arch osteotomies that are placed at locations other than those specified during planning elicit unwanted results. A method for the precise planning and sectioning of the zygomatic arch involving the use of computed tomography (CT) and a viewer program is presented herein. Furthermore, a case in which this method was applied during reduction malarplasty via a combined intraoral and external incision is described., (Copyright © 2017 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.)
- Published
- 2017
- Full Text
- View/download PDF
47. Occlusion-Fit V-Line Guide and Gooseneck Saw for Safe and Accurate Mandibuloplasty in Asians.
- Author
-
Song IS, Kwon JS, Choi YJ, Ryu JJ, and Lee UL
- Subjects
- Adult, Asian People, Cohort Studies, Computer-Aided Design, Esthetics, Female, Follow-Up Studies, Humans, Male, Patient Safety, Plastic Surgery Procedures methods, Republic of Korea, Retrospective Studies, Risk Assessment, Treatment Outcome, Young Adult, Imaging, Three-Dimensional, Mandibular Osteotomy methods, Surgery, Plastic methods
- Abstract
Background: A slender or slim face with narrow facial features is considered esthetically appealing in Asian people. Plastic surgery to obtain an oval face, called a 'V-line,' is popular among young people., Materials and Methods: A total of 20 Korean patients were included in this study. The patients underwent mandibular anguloplasty with three-dimensional computer-aided design and manufacturing surgical guides that were accurately fitted to the upper and lower teeth, allowing for precise replication of a virtual surgery during a real surgical procedure., Results: There were no significant complications, including severe bleeding, facial nerve injury, or airway obstruction. All patients were satisfied with the esthetic and functional results, except for one who was neutral toward the result. The mean satisfaction score was 4.75, which was between 'satisfied' and 'very satisfied.', Conclusion: The V-line guide and gooseneck saw allowed for safe and fast resection of bone in the mandibular angle area. This technique provides consistent results during surgery as well as minimizing surgical complications., Level of Evidence Iv: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors http://www.springer.com/00266 .
- Published
- 2017
- Full Text
- View/download PDF
48. The structural changes of upper airway and newly developed sleep breathing disorders after surgical treatment in class III malocclusion subjects.
- Author
-
Lee UL, Oh H, Min SK, Shin JH, Kang YS, Lee WW, Han YE, Choi YJ, and Kim HJ
- Subjects
- Cephalometry, Female, Humans, Imaging, Three-Dimensional, Male, Malocclusion, Angle Class III complications, Malocclusion, Angle Class III diagnostic imaging, Malocclusion, Angle Class III epidemiology, Organ Size, Orthopedic Procedures adverse effects, Postoperative Complications epidemiology, Prevalence, Prospective Studies, Sleep Apnea Syndromes epidemiology, Tomography, X-Ray Computed, Treatment Outcome, Young Adult, Malocclusion, Angle Class III surgery, Maxilla surgery, Pharynx diagnostic imaging, Postoperative Complications diagnostic imaging, Sleep Apnea Syndromes complications, Sleep Apnea Syndromes diagnostic imaging
- Abstract
Bimaxillary surgery is the traditional treatment of choice for correcting class III malocclusion which is reported to cause an alteration of oropharyngeal structures and upper airway narrowing that might be a predisposing factor for obstructive sleep apnea (OSA). This study aimed to analyze sleep parameters in class III malocclusion subjects and ascertain the prevalence of snoring or OSA following bimaxillary surgery.A total of 22 patients with Le Fort I osteotomy and mandibular setback for class III malocclusion were prospectively enrolled. All patients received endoscopic examination, cephalometry, 3-dimensional computed tomography (3D-CT), and sleep study twice at 1 month before and 3 months after surgery.The patient population consisted of 5 males and 17 females with a mean body mass index of 22.5 kg/m and mean age of 22.1 years. No patients complained of sleep-related symptoms, and the results of sleep study showed normal values before surgery. Three patients (13%) were newly diagnosed with mild or moderate OSA and 6 patients (27%) showed increased loudness of snoring (over 40 dB) after bimaxillary surgery. According to cephalometric analysis and 3D-CT results, the retropalatal and retroglossal areas were significantly narrowed in class III malocclusion patients, showing snoring and sleep apnea after surgery. In addition, the total volume of the upper airway was considerably reduced following surgery in the same patients.Postoperative narrowing of the upper airway and a reduction of total upper airway volume can be induced, and causes snoring and OSA in class III malocclusion subjects following bimaxillary surgery.
- Published
- 2017
- Full Text
- View/download PDF
49. Prevalence and risk factors of tooth discolouration after orthognathic surgery: a retrospective study of 1455 patients.
- Author
-
Lee UL, Lee EJ, Seo HY, Han SH, Choi WC, and Choi YJ
- Subjects
- Adult, Female, Humans, Male, Maxilla, Orthognathic Surgical Procedures statistics & numerical data, Postoperative Complications etiology, Prevalence, Retrospective Studies, Risk Factors, Tooth Discoloration etiology, Orthognathic Surgical Procedures adverse effects, Postoperative Complications epidemiology, Tooth Discoloration epidemiology
- Abstract
This study was conducted to evaluate the prevalence of tooth discolouration and to examine the factors that may pose a higher risk for tooth discolouration after orthognathic surgery. This was a retrospective study of 1455 orthognathic surgeries. The following data were collected for analysis: presence of discoloured teeth, sex, age at operation, the extent of the surgical displacement of the maxilla, and whether patients had undergone genioplasty, zygomaplasty, or descending palatine artery (DPA) ligation. Out of 1339 patients who underwent double-jaw surgery, 49 received root canal treatment due to tooth discolouration. No tooth discolouration was found in the 116 patients undergoing single-jaw surgery. DPA ligation, genioplasty, and mandibular sub-apical osteotomy were associated with a significant risk of tooth discolouration. Patients should be informed preoperatively of the possibility of tooth discolouration. Additionally, the DPA should be preserved during Le Fort I osteotomy to reduce the risk of tooth discolouration., (Copyright © 2016 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.)
- Published
- 2016
- Full Text
- View/download PDF
50. Simultaneous Bimaxillary Surgery and Mandibular Reconstruction With a 3-Dimensional Printed Titanium Implant Fabricated by Electron Beam Melting: A Preliminary Mechanical Testing of the Printed Mandible.
- Author
-
Lee UL, Kwon JS, Woo SH, and Choi YJ
- Subjects
- Adult, Electrons, Esthetics, Dental, Facial Asymmetry etiology, Female, Humans, Mandibular Neoplasms complications, Mandibular Neoplasms surgery, Prosthesis Design, Titanium, Facial Asymmetry surgery, Mandibular Prosthesis, Mandibular Reconstruction methods, Maxilla surgery, Printing, Three-Dimensional
- Abstract
A woman presented with a long history of mandibular defects posterior to the left lower first premolar caused by inadequate reconstruction after removal of a tumor on the left side of the mandible. In the frontal view, extreme facial asymmetry was apparent. The dental midline of the mandible was deviated 10 mm to the left compared with the dental midline of the maxilla, and all maxillary teeth were inclined to the left owing to dental compensation. There was an 8-mm maxillary occlusal cant relative to the maxillary first molar. Bimaxillary surgery using computer-assisted designed and computer-assisted manufactured devices without an intermediate occlusal splint was performed to align the maxilla and mandible at the correct position, and reconstructive surgery for the mandible using a 3-dimensional printed titanium mandible was concurrently performed. In particular, during the virtual mandible design, 2 abutments that enabled the prosthetic restoration were included in the mandible using a computer-assisted design program. This report describes the successful functional and esthetic reconstruction of the mandible using electron beam melting technology, an alternative technique for reconstruction of mandibles that did not undergo radiation therapy., (Copyright © 2016 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.)
- Published
- 2016
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.