RESUMO
OBJECTIVE: The aim of this study is to assess dentoskeletal symmetry in cone-beam computed tomography (CBCT) scans of Brazilian individuals with Angle Class I malocclusion. MATERIAL: A total of 47 patients (22 females and 25 males) aged between 11 and 16 years old (14 years) seen in a private radiology service (CIRO, Goiânia, GO, Brazil) were assessed. All CBCT scans were obtained from January, 2009 to December, 2010. Cephalometric measurements were taken by multiplanar reconstruction (axial, coronal and sagittal) using Vista Dent3DPro 2.0 (Dentsply GAC, New York, USA). Minimum, maximum, mean and standard deviation values were arranged in tables, and Student t-test was used to determine statistical significance (P < 0.05). RESULTS: Data were homogeneous, and differences between the right and left sides were not significant. CONCLUSIONS: Cephalometric measurements of Brazilian individuals with Angle Class I malocclusion can be used to establish facial symmetry and three-dimensional standard references which might be useful for orthodontic and surgical planning.
Assuntos
Cefalometria/métodos , Imageamento Tridimensional/métodos , Má Oclusão Classe I de Angle/patologia , Adolescente , Pontos de Referência Anatômicos/diagnóstico por imagem , Pontos de Referência Anatômicos/patologia , Criança , Queixo/diagnóstico por imagem , Queixo/patologia , Tomografia Computadorizada de Feixe Cônico/métodos , Meato Acústico Externo/diagnóstico por imagem , Meato Acústico Externo/patologia , Face/diagnóstico por imagem , Face/patologia , Assimetria Facial/diagnóstico por imagem , Assimetria Facial/patologia , Ossos Faciais/diagnóstico por imagem , Ossos Faciais/patologia , Feminino , Humanos , Processamento de Imagem Assistida por Computador/métodos , Masculino , Má Oclusão Classe I de Angle/diagnóstico por imagem , Mandíbula/diagnóstico por imagem , Mandíbula/patologia , Côndilo Mandibular/diagnóstico por imagem , Côndilo Mandibular/patologia , Maxila/diagnóstico por imagem , Maxila/patologia , Dente Molar/diagnóstico por imagem , Dente Molar/patologia , Osso Nasal/diagnóstico por imagem , Osso Nasal/patologia , Órbita/diagnóstico por imagem , Órbita/patologia , Fotografação/métodosRESUMO
OBJECTIVE: To evaluate the frequency of Apical Root Resorption (ARR) after orthodontic treatment at 52-288 months using periapical radiography (PR) and cone beam computed tomography (CBCT). METHODS: Radiographic images obtained from 58 patients, before (T1) and after orthodontic treatment (T2), and following 52-288 months of treatment were analyzed by three members of the Brazilian Board of Orthodontics. Apical structures were evaluated by PR images (T2 and T3), using Levander and Malmgren scores. The presence of ARR on CBCT images was detected only at T3. The Kolmogorov-Smirnov test was used for statistical analyses, and the level of significance was set at 5%. Kappa statistics determined interobserver agreement. RESULTS: The more frequent ARR were with scores 1 in T2 (51.6%) and T3 (53.1%), when evaluated by PR (p > 0.05). When compared the frequencies of ARR in T3 among PR and CBCT images, the differences were significant for maxillary and mandibular premolar groups, and for mandibular molar group (p > 0.05). The teeth with highest frequency of ARR presence using CBCT images were maxillary lateral incisors (94.5%) and mandibular central incisors (87.7%), while the premolars showed the lowest frequency. The CBCT images showed that the teeth involved in orthodontic treatment with extraction present higher ARR frequency (p < 0.05). CONCLUSIONS: PR showed more frequency of ARR in posterior teeth groups when compared with CBCT images. ARR did not change in long-term post treatment.