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Abstract

The Class III malocclusion is the most difficult anomalies to understand. The purpose of this study was to investigate the differences in morphological characteristics of Class III malocclusion patient who can properly treated by orthodontic treatment only or combined orthognathic surgery. To find the most important morphological factors those influence the treatment planning and predict probability of orthognathic surgery. The pre-treatment lateral cephalograms of two groups of 80 subjects (40 orthodontic and 40 surgical) with Class III malocclusion were analyzed. Thirty-seven linear, proportional, angular and soft tissue measurements were made. Two sample t test was applied to identify the dentoskeletal variables that best separate the two groups. The findings of the study indicated that Class III malocclusion patients with orthognathic surgery present with significantly larger linear dimensions of the mandible, higher vertical dimension, larger gonial angle and the mandibular incisor more retroclined. However, self-perception of profile may be important factors affecting the patient decision to opt for surgical correction.

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