| Summary: | 碩士 === 長庚大學 === 顱顏口腔醫學研究所 === 106 === Background/Objectives: Postoperative symmetry is believed to be one of the most crucial treatment goals of orthognathic surgery (OGS). Hence, this study explored the critical parameters determining the visual perception of postoperative facial symmetry in patients with skeletal Class III malocclusion.
Subjects/Methods: This study consecutively enrolled 24 patients with skeletal Class III malocclusion who underwent double-jaw OGS. The patients were classified according to the outcome of subjective visual perception: symmetrical surgical outcome (S group, n = 12) and facial asymmetry after surgery (A group, n = 12). The subjective evaluation of facial asymmetry was based on scoring of postoperative frontal images by 10 orthodontists. The three-dimensional dentofacial measurements, which were obtained through cone beam computed tomography, were compared between the S and A groups. The relationship among the parameters was explored by calculating the Spearman correlation coefficient.
Results: Significant differences were observed in the midline parameters in the mandible, the B point, Gnathion and Menton, and the mandibular border axis as well as in the discrepancy of the chin morphology between the two groups (p < 0.05). However, no significant differences were found in the maxillary parameters.
Limitations: This study included a predominately female and relatively small sample size.
Conclusions/Implications: The findings demonstrate that the midline parameter deviation, shape of the mandibular border, and the contour of menton morphology play the major role in the visual perceptions of postoperative asymmetry.
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