Análise radiográfica da posição da cabeça da mandíbula e angulação da eminência articular em indivíduos com má oclusão de classe I e II divisão 1

Abstract

The objective of this study was to analyze the position of the head of the mandible and the articular eminence angle in Class I and Class II division 1 malocclusion samples. Modified for TMJ panoramic radiographs of 264 pre-orthodontic patients aged between 7 and 60 years were digitized on a Hewlett Packard F4180 Scanner. The position of the head of the mandible was determined according to Gelb’s template and the articular eminence angle was measured according to the Frankfurt horizontal plan and a line connected from the deepest point of the roof of the fossa and the top of articular eminence in mouth closed sagittal images. Chi-square, McNemar-Bowker, Paired Student t tests were applied, and Pearson product moment correlations were determined after measurements on both sides were obtained. It was observed difference in head position of the mandible on the right side (p = 0.007) between both groups. Class II division 1 malocclusion samples showed a trend (p = 0.039) to a more asymmetrical position between sides. The inclination of the articular eminence in Class I malocclusion patients showed differences between sides (p = 0.010), which was not observed in the other group (p = 0.391). The difference between groups was verified in angulation of the left side in children aged 7 to 12 years (p = 0.036) and right side (p = 0.022) and left side (p = 0.002) in adults from 20.1 to 60 years. There was no correlation between overjet and articular eminence inclination. Therefore, it was concluded that the normal position of the head of the mandible was more prevalent in both groups on the right side and Class II division 1 malocclusion samples showed steeper eminence on the left side in children aged 7 to 12 years and on both sides in adults from 20.1 to 60 years.