Search

El estudio de anormalidades dentales en mustélidos ha permitido identificar y describir patologías de especímenes distribuidos en diferentes hábitats y continentes. Estos análisis han sido implementados en cráneos de animales muertos. A través de un monitoreo no invasivo, se detectó a un mustélido neotropical in situ con una anormalidad dental, esa característica fue aprovechada para obtener información ecológica de la especie. Se analizaron registros de cámara trampa de un cabeza de viejo (Eira barbara) en vida libre en el sur de Brasil, el cual presentaba un canino superior izquierdo sobre-desarrollado, esta característica permitió identificarlo individualmente y recapturarlo. Mediante la estimación de densidad de Kernel se calculó el tamaño de su ámbito hogareño. Se revisaron cráneos de la especie en busca de anormalidades dentales. El espécimen fue recapturado en 5 estaciones de foto-muestreo dentro del Floresta Nacional de São Francisco de Paula (FLONA-SFP) en 11 ocasiones diferentes, durante un periodo de 7 meses (Marzo a Septiembre de 2012), el tamaño de su ámbito hogareño fue de 4.79 km2. Se encontraron diferencias en la cantidad de molares en dos mandíbulas de los cinco cráneos revisados. Aparentemente el canino anormal no ha interferido en la alimentación del espécimen, ya que ha alcanzado la adultez. El cabeza de viejo podría ocupar un área fuera de nuestro polígono de estudio dentro de la FLONA-SFP, por lo cual el tamaño de su ámbito hogareño podría ser más grande de lo que se reporta.

A 56 year old man presented with one-sided cleft palate, affecting alveolar ridge in the upper left canine region. Patient was unable to eat and drink without having the food fall out through his mouths opening into his nose. During first visit, patient underwent x-ray analysis to identify how deeply the bone damage has affected his maxilla. It revealed deep bone penetration, connecting the base of the nose with the mouth. We suggested one of the most effective methods for treating these types of cases – a removable partial denture, which was made to work as an obturator at the same time, closing the space, which causes difficulties to the patient. This case report represents a rare presentation and treatment of cleft palate by using removable partial dentures (RPDs) to close the gap, connecting the patient’s mouth with the nose structures.

Age determination from counts of growth layer groups (GLGs) in tooth dentine is a common method for aging marine mammals. Using known-aged animals, we validated this method for acid etched teeth of California sea lions (CSLs), Zalophus californianus. Between 1991 and 2013, the upper left canine (n = 33) was collected opportunistically during necropsy from animals tagged or branded as pups that later died. Overall, 55%-61% of age estimates by GLG counting were within 1 yr of the known-age in the sample of 1-30-yr-old CSLs. Accuracy of age estimates was found to be dependent on age of the CSLs, however. 71%-79% of age estimates were within 1 yr of the known-age in CSLs

Our aim was to give a morphometric description of the interproximal bone between the anterior maxillary teeth of subjects with class III facial deformity, who were candidates for segmented Le Fort I osteotomy. We measured the width of the interproximal bone from the upper right canine to the upper left canine in cone-beam computed tomographic images of 35 subjects, and identified five interproximal areas of measurement. The lower and upper measurements were established 5mm and 10mm from the cervical crest of the interproximal bone. A paired samples t test and Pearson's correlation coefficient were applied and probabilities of less than 0.05 were accepted as significant. In all the scans of interproximal bone, the apical zone was significantly wider than the inferior zone (p

Introduction/Objective. Finite element analysis (FEA) is mathematical method which can be used for the assessment of biomechanical behavior of dento-alveolar complex. The objective was to analyze biomechanical behavior changes of teeth and supporting tissues under occlusal load in cases of horizontal and vertical alveolar bone loss, to assess potential impact of tooth displacement and altered stress distribution on further damage, and to evaluate the impact of regenerative periodontal therapy. Methods. Three patient-specific three-dimensional-Finite-Element (3D FE) models were developed from the acquired cone beam computed tomography, comprising the patient's upper left canine, first and second premolar, and adjacent bone. Model 1 represented horizontal bone loss; Model 2 included intrabony defect along distal aspect of tooth #24. Model 3 represented situation six months after the regenerative periodontal surgery. Displacement, Von Mises, and principal stresses were evaluated through FEA, under moderate vertical occlusal load. Results. FEA demonstrated that in model with vertical bone loss significant tooth displacement was present, even though the clinically evident tooth mobility was absent. Biomechanical behavior and stress distribution of teeth and surrounding tissues under moderate occlusal load was much more altered in case with vertical bone loss in comparison with horizontal bone loss. Six months following the regenerative therapy, the values of all evaluated parameters were noticeable reduced. Conclusion. Regenerative periodontal therapy improved the biomechanical characteristics of the affected teeth and the related periodontal structures.

Introduction Functional and aesthetic outcome is an indication of successfully dental implant treatment. Single implant with chairside immediate provisional crown loading is preferred treatment for patient aesthetic demand and implant survival success. Objective This case report is to show an alternative procedure to get good functional, aesthetic, less morbidity, and reducing treatment period with a chairside immediate provisional crown. Case A 54 years old women wanted to replace her missing upper left canine with a dental implant. She hoped that this procedure would not affect her appearance. A single implant with 4 mm diameter and 10 mm height was placed in the upper left canine area. A rigid abutment was installed, and a chairside provisional crown was built at a rigid cap immediately after surgery. Conclusion A chairside immediate provisional crown after a single implantation procedure is a very good alternative to get an aesthetic, functional, morbidity, and shorter treatment.

The aim of this study was to verify the precision and applicability of two methods of age estimation, Kvaal’s and Cameriere’s methods, among Brazilian adults. A sample composed of periapical radiographs of canine teeth belonging to 320 Brazilian adults was analyzed, divided into groups according to sex (male and female) and age group (20–29 years, 30–39 years, 40–49 years and 50-59 years). Kvaal’s method presented better results when compared to the results of Cameriere’s method in the general evaluation of each canine tooth, except for the upper left canine (tooth 23), which presented a mean error (ME) with no statistically significant difference between the methods (Kvaal: ME = 7.43, p = 0.4991, Cameriere: ME = 7.55, p = 0.6982). In the evaluation by age groups, Kvaal’s method presented a lower variation between the real age and estimated age when applied to the age groups of 20-29 years and 30-39 years compared to the results provided by Cameriere’s method. With respect to the groups aged 40 to 49 years and 50 to 59 years, Cameriere’s method presented better performance than the results provided by Kvaal’s method. The methods of estimating age proposed by Kvaal and Cameriere are simple and nondestructive and have demonstrated reproducibility and reliability. The Kvaal method was more accurate for the age groups of 20-29 and 30-39 years, and for those over 40 years, the Cameriere method was the most accurate.

Background To assess the accuracy of digital models generated using commercially available software to predict anterior teeth root inclination characteristics and compare the results to relevant data obtained from CBCT images. Material and Methods Following sample size calculation and after application of inclusion and exclusion criteria, pre-treatment maxillary and mandibular plaster models and the corresponding CBCT scans of 31 patients attending a private orthodontic clinic were selected. The subjects were 10 males and 21 females with age range 12 to 40 years. Plaster models were scanned using the high resolution mode of an Ortho Insight 3D scanner and CBCT scans were taken using a Kodak 9500 Cone Beam 3D System machine. The teeth on the digital scans were segmented and virtual roots were predicted and constructed by the Ortho Insight 3D software. The long axes of the predicted roots and the actual roots, as segmented from the CBCT images, were computed using best-fit lines. The inter-axis angle was used to assess error in root inclination prediction by the software. Mann-Whitney and Kruskal-Wallis tests were used. Intra-examiner error was evaluated using the Bland-Altman method. Results The maximum disparity in angle between images derived from digital models and CBCT data was almost 40 degrees (upper left canine). The upper and lower canines produced the worst results, followed by the lower lateral incisors. The upper central incisors showed the best results, although the maximum angle of difference exceeded 20 degrees (with the median around 8 degrees). Conclusions Root morphology imaging prediction is not a primary function of this software and this study confirmed its limitation as a sole tool in routine clinical applications. At present these predictions cannot be considered accurate or reliable unless correlated clinically with a radiographic image. Key words:Digital models, CBCT, tooth root inclination prediction software.

UIDB/04038/2020 UIDP/04038/2020 Accurate sex prediction is a key step in creating a postmortem forensic profile as it excludes approximately half the population. It is our goal to develop a predictive model to establish sex through teeth mesiodistal widths in a Portuguese population. The pretreatment dental casts of 168 of Portuguese orthodontics subjects (59 males and 109 females) were included. Mesiodistal widths from right first molar to left first molar were measured on each pretreatment cast to the nearest 0.01 mm using a digital caliper. Overall, the mesiodistal widths of the upper and lower canines, premolars, and molars were found to be significantly different between females and males. Conversely, no significant differences between sexes were identified for incisors. A multivariate logistic regression model for sex prediction was developed and the teeth included in the final reduced model being the upper left canine (2.3), the lower right lateral incisor (4.2) and the lower right canine (4.3). There is a prevalence of sexual dimorphism in all teeth except the incisors. The canines present the most noticeable difference between sexes. The presented sex determination predictive model exhibits an overall correct classification of 75%, outperforming all available models for this purpose and therefore is a potential tool for forensic analysis in this population. publishersversion published

É denominado incluso o dente que, chegada a época cronológica de erupção, permanece parcial ou totalmente incluído dentro do osso alveolar, com preservação ou não do folículo pericoronário. Quando não associado a nenhuma desordem, os mesmos podem ser aproveitados. Dentre os métodos de aproveitamento de dentes impactados, podemos citar o acompanhamento, erupção ortodonticamente assistida ou transplante. O objetivo deste trabalho foi relatar dois casos de aproveitamento de dentes inclusos. Caso 1 – Paciente do sexo feminino, 15 anos, leucoderma, normossistêmica, foi encaminhada pelo seu ortodontista para tracionamento orto-cirúrgico dos elementos 13 (canino superior direito) e 23 (canino superior esquerdo) inclusos. Ao exame clínico intrabucal constatou-se ausência dos mesmos. O tratamento consistiu na exposição cirúrgica dos elementos 13 e 23 pela técnica de reposicionamento apical do retalho (técnica aberta) e colagem de botão ortodôntico para posterior tracionamento. Caso 2 - Paciente do sexo feminino, 20 anos, feoderma, normossistêmica, compareceu para exodontia do elemento 37 (segundo molar inferior esquerdo). Ao exame clínico intrabucal constatou-se grande destruição coronária no referido elemento por cárie dentária. Devido à impossibilidade de outros tratamentos, foi planejada a remoção do mesmo e subsequente transplante autógeno do elemento 38. Optou-se pela realização do transplante em sessão única (imediata). Sabendo do importante papel que os dentes exercem no bem estar físico, funcional e social é importante o cirurgião dentista conhecer e saber indicar as técnicas de aproveitamento dos dentes inclusos com a finalidade de minimizar os transtornos advindos da inclusão ou perda dos dentes.

Aligning a displaced maxillary canine into the dental arch is one of the most complicated problems in orthodontics. In cases of extremely high displacement, the tooth is frequently removed surgically. Because of the upper canines’ significance to dental esthetics and functional occlusion, such a decision is a very serious one. The purpose of this report is to illustrate an interdisciplinary approach involving both orthodontic management and conservative tooth restoration. The case was treated through an orthodontic nonextraction fixed appliance mechanotherapy for successful alignment of buccally ectopic upper left canine followed by a conservative direct composite tooth buildup of peg lateral incisor associated with the upper left ectopic canine in a 16-year-old adolescent North Indian female. Posttreatment records demonstrated good alignment of the displaced tooth and restoration of normal anatomy of the peg shaped lateral incisor.

Ankylosis is the abnormal adhesion of alveolar bone to dentin or cementum and commonly seen after traumatic dental injuries. Treatment of impacted and ankylosed teeth solely by orthodontics alignment may be challenging. Consequently, several treatment alternatives have been proposed for the management of ankylosed teeth involving extraction, surgical luxation, and osteotomy followed by dentoalveolar distraction or conventional orthodontic treatment. This case report describes a 55-year-old female who was referred by her orthodontist due to an impacted and ankylosed maxillary upper left canine. A dentoalveolar segmental osteotomy with immediate repositioning of an upper canine was performed. One year after final orthodontic treatment a satisfying occlusal and esthetic treatment outcome was obtained.

OBJECTIVE: This report aimed to present a case of functional and aesthetic rehabilitation of anterior maxillary region through dentogingival prosthesis in a patient with high smile line.CASE DESCRIPTION: Patient female, 65 years old, had aesthetic complaints related to fixed partial denture from upper left canine to upper right lateral incisor. The patient reported loss of upper central incisors due to periodontal disease progression. Clinical and radiographic examination showed marginal leakage, discrepancy in teeth proportion, dental inclination and alignment, and excessive prolongation of the cervical-incisal direction, plus a resorbed alveolar ridge, in both volume and height, in the described area. Faced with these conditions, it was decided to perform a fixed partial dentogingival denture, restoring harmony and smile functionality.CONCLUSION: After a 1-year follow up, maintenance of functional and aesthetic aspects of the prosthesis was observed. *Reabilitação estética através de prótese dentogengival em paciente com linha alta de sorriso*OBJETIVO: O objetivo deste trabalho é relatar um caso de reabilitação estética e funcional da região ânterosuperior, através de prótese dentogengival em uma paciente com linha alta de sorriso.RELATO DE CASO: Paciente feminina, 65 anos, apresentou queixa estética relacionada à prótese parcial fixa do canino superior esquerdo ao incisivo lateral superior. A paciente relatou a perda dos incisivos centrais superiores devido à progressão de doença periodontal. Através de avaliação clínica e radiográfica observou-se na área descrita: infiltração marginal das restaurações, discrepância na proporção, inclinação e alinhamento interdentários, relacionados à rebordo alveolar reabosrvido, tanto em volume como em altura. Nestas condições, optou-se por realizar uma prótese parcial fixa dentogengival, restaurando a harmonia e a funcionalidade do sorriso.CONCLUSÃO: Após um ano de acompanhamento, foi observado manutenção dos aspectos funcionais e estéticos da prótese.

Made available in DSpace on 2019-09-12T16:26:00Z (GMT). No. of bitstreams: 0 Previous issue date: 2009 During clinical practice, when performing prosthetic rehabilitation with single crowns, improper reproduction of the dental contour by the dental laboratory is a common occurrence. Therefore, the present study evaluated the fidelity of the reproduction of the buccal contour in an upper left canine performed by three Dental Prosthesis Technicians (DPT) using the indirect laminate veneer technique. First, the DPTs confected the veneers based on a model obtained from the upper arch of a dental dummy, containing a replica of an upper left canine with a prosthetic preparation for a laminate veneer. Then, the same DPTs received other identical models, now with the replica of the upper left canine with no preparation, to be used as an anatomical reference for confecting the laminate veneers. The laminate veneers were then bonded to the plaster models and had their buccal contour individually measured. Measurements were also made of the buccal contour of the reference canine. The data were analyzed by ANOVA and the t-test (p = 0.05). Results showed 100% of buccal overcontour when the laminate veneers were compared to the reference canine, regardless of which DPT confected the veneer and regardless of using or not the anatomical reference. The DPTs who participated in the present study were unable to acomplish a faithful anatomical reproduction of the buccal contour, creating an overcontour in all samples. This situation may be responsible for increasing the probability of periodontal and esthetic harm in clinical practice. [Vasconcelos, Flávia Sabrina Queirós; Neves, Ana Christina Claro; Silva-Concílio, Laís Regiane da; Cunha, Leonardo Gonçalves; Rode, Sigmar de Mello] Universidade de Taubaté, Brazil

Trauma with accompanying fracture of permanent anterior teeth is a tragic experience for the young patients and create psychological impact on them. Crown fracture accounts for the highest percentage of ail traumatic injury in the permanent dentition. The clinician plays a vital role in the prognosis of traumatized tooth. It depends on his accurate diagnosis and treatment procedure at two separate levels; the pulpal and the restorative level. This case report describes the management of subgingival fracture in an upper left canine.

To report a rare case of a lateral frenum hypertrophy in an infant, this paper describes the case of a girl who came to a first dental appointment when she was 4 months old. A hypertrophic lateral frenum in the upper left canine region was detected. A great depression in the gingival rodet separated the anterior maxillary segment from the posterior one and also decreased the lip mobility in this region. A frenectomy was performed when the patient was 11 months old and the clinical follow-up was done up to the age of 30 months. There was normalization in the vestibular insertion of the lateral frenum, lip mobility, physiological development of the maxilla, and eruption of the upper incisors, canines, and first primary molars. Infants should go to a dental examination precociously in order to detect possible congenital and development alterations.

INTRODUCTION: Dental transposition and impaction are disorders related to ectopic eruption or failure in tooth eruption, which can affect child physical, mental and social development and may be difficult to be clinically solved. METHODS: We describe a case of transposition between the upper left canine and lateral incisor associated with impaction of the central incisor on the same side, in a 12-year-old patient. Conservative treatment involving surgical-orthodontic correction of transposed teeth and traction of the central incisor was conducted. CONCLUSION: The option of correcting transposition and orthodontic traction by means of the segmented arch technique with devices such as cantilever and TMA rectangular wire loops, although a complex alternative, was proved to be esthetically and functionally effective. INTRODUÇÃO: transposição e impacção dentárias são distúrbios relacionados à erupção ectópica ou à falha na erupção dentária, que podem afetar o desenvolvimento físico, psíquico e social da criança, e que podem ser de difícil resolução clínica. MÉTODOS: é descrito um caso clínico de transposição entre o canino e o incisivo lateral superior esquerdo, associado à impacção do incisivo superior, do mesmo lado, em uma paciente de 12 anos de idade. Optou-se pela realização de tratamento ortodôntico-cirúrgico conservador, envolvendo a correção ortodôntica dos dentes transpostos e o tracionamento do incisivo central impactado. CONCLUSÃO: a opção pela correção da transposição e tracionamento ortodôntico com a utilização da técnica do arco segmentado com uso de dispositivos como cantiléver e alças em fios TMA retangulares, apesar de ser uma alternativa de execução complexa, mostrou-se efetiva do ponto de vista estético e funcional.

Background: Orthodontic management of an ectopically erupted canine requires substantial amount of bodily movement which is difficult to perform and often results in root resorption. Case presentation: A 9 year old girl presented with Class I malocclusion with crowding and ectopically positioned upper left canine (23). Treatment involved extraction of all first premolars. The alignment of the upper left canine was achieved by the modified 2 by 1 appliance. Conclusion: The design of this modified 2 by 1 appliance allows individualized bodily tooth movement of canine, it provides light and continuous force for physiological orthodontic movement with minimal root resorption. © 2009 Tsui et al; licensee BioMed Central Ltd., published_or_final_version

The all porcelain post crown, which had been cemented as a substitute for the upper left canine of a patient at Tohoku University School of Dentistry, Department of Prosthodontics in 1970, fell off five years and six months after cementation.Subsequent inspection of the post crown disclosed that the post which had been used was tapered and too short for the size of the tooth crown, and was directly subjected to bite force because the root cap of the post crown had been simply attached to the tooth substance. To avoid such imperfections, a metal core and porcelain jacket crown were applied. However, the porcelain jacket crown fell off together with the metal core while the patient was having a meal in May 1988, twelve years and four months after cementation. The abutment tooth was simultaneously broken and had to be extracted.As described above, we followed the prognosis of a case for eighteen years starting from the primary treatment at the Department of Prosthodontics of Tohoku University, with particular attention to the latter twelve years and four months, during which time a porcelain jacket crown was in place.Based on these observations, we report problems encountered in the case and possible countermeasures.

A 15 year and 1 month old Chinese female with palatally impacted upper left canine was successfully treated with an upper removable appliance with a magnet incorporated to provide orthodontic traction force. This case report indicates the possibility of using magnetic force as a safe, effective and comfortable way for orthodontic traction., published_or_final_version

Factor VII deficiency was diagnosed during haematological investigation of a patient with multiple occurrences of postoperative bleeding after surgical extraction of an impacted upper left canine. The bleeding was eventually stopped with local measures without resorting to blood product transfusion which may have been necessary if local measures had failed to control bleeding. Abnormalities were also found in subsequent blood profiles and coagulation tests in other members of the patient's family.

This paper examines unusual eighteenth and nineteenth century dental treatment and its consequences, in a nobleman excavated from beneath St. Nicholas' Church, Sevenoaks, Kent, UK in the early 1990s. This rare archaeological case exhibits erosion of dental enamel on the labial surface of all the anterior dentition. A programme of historical research suggests that this might be attributed to the application of an acid-based dental tincture or the use of an abrasive substance to whiten the teeth. Palliative treatment for the consequence of this application was prescribed by Dr Robert Blake of Dublin. Further, it bears witness to three dental restorations, two of gold and one tin. The two gold (foil) fillings are an occlusal in the upper-right second molar and a cervical on the labial surface of the upper left canine. The tin filling is an occlusal in the upper left second molar. Excavation of the carious tissue appears to have been undertaken using a spoon shaped implement.

The ability of two different toothbrush bristle ends to produce traumatic gingival abrasion was assessed in a double blind study of 15 male and 15 female young adults. Brushing was performed in a circular fashion using a modified Bass Technique. An apparatus allowing continuous visual feedback of the average brushing force permitted a degree of standardization of the system. The upper left canine and bicuspid area had to be brushed for 30 seconds with cut toothbrush bristles (CP) and with round ended toothbrush bristles (RP) respectively. A two week interval separated the two brushing sessions. Traumatic lesions of the attached gingiva were stained with a disclosing solution, photographed and evaluated planimetrically. The "cut bristles" caused gingival abrasions 30% greater in extent than the round end bristles. The difference was not due to single brushing strokes accidentally greater for the "cut bristles". The size of the lesions was not sex dependent. To prevent gingival damage it is desirable to either round the bristles in production or to rid the bristle ends at least of sharp edges.

Cats were trained to escape electrical stimuli delivered to the pulp of the upper left canine tooth, and to press a lever to obtain food. Subsequently, electrolytic lesions were produced in the medial thalamus. The cats were again tested 2–3 wk later. In addition they were trained in an avoidance conditioning paradigm, using grid shock delivered to the paws as the unconditioned stimulus. After all the postoperative data were gathered, the animals were killed and the histological and behavioral data were evaluated. There was no correlation between the effect of the lesion on noxious versus nonnoxious stimuli; all operated cats learned to avoid the grid shock when a warning signal appeared. In addition, it appears that destruction of the rostral portion of the nuclei centrum medianum and parafascicularis is most critical for abolishing the escape response to tooth pulp stimulation.

A method described previously for recording in two dimensions the displacement path of a point on the surface of a tooth under occlusal stress was applied to the upper left canine and upper left first molar in several subjects. The results confirmed the earlier findings that the displacement path of the canine was an almost straight line, that the return path was very close to the outward path and that separation of the teeth did not occur until the test tooth had recovered half or more of its displacement. The displacement path of the molar was considerably steeper than that of the canine and was sometimes curved. In these cases, the return path was still generally straight.