A study on the relationship of the mandibular symphysis and anterior alveolar and skeletal morphology according to the rotational growth pattern of mandible in skeletal Class III malocclusion

Kim, Seoh Jun; Son, Woo Sung

Abstract

The aim of this study was to evaluate the morphology of the mandibular symphysis and anterior alveolar and skeletal d relationship under the influence of the rotational growth pattern of mandible in skeletal Class III malocclusion. A total of 86 untreated adult subjects were divided into two groups-forward rotational growth pattern group, backward rotational growth pattern group-according to the suggestion of Skieller et al. The antero-posterior position, vertical relationship, mandibular symphysis and anterior alveolar and skeletal relationship were assessed on lateral cephalometric radiographs. Mandibular symphysis and anterior alveolar and skeletal relationship in each subject were studied and the following conclusions were drawn: 1. Concerning the antero-posterior position, forward rotational growth pattern group showed significantly larger SNA, SNB. Concerning the vertical relationship, all measurements showed statistically significant differences. 2. Forward rotational growth pattern group showed significantly larger IMPA MnAD, backward rotational growth pattern group showed significantly larger MxABH. 3. There was no statistically significant difference in symphysis ratio to mandibular plane between forward and backward rotational growth pattern group. 4. In the correlative analysis of rotational growth pattern of mandible and mandibular symphysis, anterior alveolar of and skeletal relationship, statistically significant correlations in overbite, IMPA, MnAD, symphysis width were showed.