RESUMO
The aim of this study was to determine whether skeletal and/or dental asymmetries are presented in individuals with normal dental occlusions. Frontal cephalometric radiographs and dental arch casts were obtained from 20 Brazilians from Rio de Janeiro whose mean age was 22.4 years. Normal dental occlusions were present in all individuals. Nine bilateral triangles were established on the radiographs for the craniodentofacial complex. The area for each triangle was calculated, and the frequency of asymmetries on the dental casts was investigated. When comparing right and left sides on the radiographs, Student's tests did not show statistically significant differences in triangle areas, although the areas were not symmetrical. Males and females showed similar results when the areas of the radiographic triangles were compared between sexes. Maxillary and mandibular dental midlines, palatal raphe on the casts, and median sagittal plane on the radiographs were almost coincident. Additionally, the frequency of molar asymmetries on the dental casts was not statistically different, but molar asymmetries greater than 1 mm were present in 50% of the sample.
Assuntos
Arco Dental , Assimetria Facial/epidemiologia , Mandíbula/anatomia & histologia , Maxila/anatomia & histologia , Adolescente , Adulto , Cefalometria , Distribuição de Qui-Quadrado , Feminino , Humanos , Masculino , Estatísticas não ParamétricasRESUMO
The aim of this study is to determine whether or not skeletal and/or dental asymmetries were presented in patients with Class II division 1 subdivision malocclusions. Frontal cephalometric radiographs and dental arch casts were obtained from thirty Brazilians from Rio de Janeiro; the mean age of the sample was 11.6 years. Nine bilateral triangles were established on tracings of the radiographs to describe the cranio-dento-facial complex. The area of each triangle was calculated, and the frequency of AP and transverse asymmetries on the dental casts were determined. When comparing Class I and Class II sides on the radiographs, Student t-tests did not show any statistically significant differences in triangle areas. However, the frequency of asymmetries on the dental casts were statistically significant at the 1% level. These asymmetries were more evident in the anteroposterior plane than in the transverse plane and in the lower arches than in the upper arches. It was concluded that Class II division 1 subdivision malocclusions are characterized by dental deviations and not skeletal dysplasia in the frontal plane.