Treatment Outcome of Bimaxillary Surgery for Asymmetric Skeletal Class II Deformity
| Autor: | Yun Fang Chen, 陳韻芳 |
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| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 Background and Purpose: Facial asymmetry is one of the main concerns in patients with dentofacial deformity. The aims of the study were (1) to evaluate the changes in facial asymmetry after bimaxillary surgery for asymmetric skeletal Class II deformity, and (2) to compare preoperative and postoperative facial asymmetry of Class II patients with normal controls. Methods: The facial asymmetry of 30 adults who consecutively underwent bimaxillary surgery for asymmetric skeletal Class II deformity were assessed on cone-beam computed tomography before and at least 6 months after surgery. The asymmetry index of each landmark of face was calculated. Results were compared with those of 30 normal control subjects with skeletal Class I structure. Results: After surgery, the asymmetric index of the lower face and total face decreased significantly (17.8m ± 29.4 mm and 16.6 ± 29.5 mm, respectively, both p < 0.01), whereas the asymmetric index of the middle face increased significantly (1.2 ± 2.2 mm, p < 0.01). Postoperatively, 53 percent of the Class II patients had residual chin asymmetry. The postoperative total face asymmetric index was positively correlated with the preoperative asymmetric index (r = 0.37, p < 0.05). Conclusions: In patients with asymmetric Class II deformity after bimaxillary surgery, lower face asymmetry improved significantly. However, around 50 percent of the patients still had residual chin asymmetry. The postoperative asymmetry of total face was related to the initial severity of asymmetry. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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