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Treatment outcome of bimaxillary surgery for asymmetric skeletal class II deformity.

Abstract：

OBJECTIVES:Facial asymmetry is one of the main concerns in patients with a dentofacial deformity. The aims of the study were to (1) evaluate the changes in facial asymmetry after bimaxillary surgery for asymmetric skeletal class II deformity and (2) compare preoperative and postoperative facial asymmetry of class II patients with normal controls. MATERIALS AND METHODS:The facial asymmetry was assessed for 30 adults (21 women and 9 men, mean age: 29.3 years) who consecutively underwent bimaxillary surgery for asymmetric skeletal class II deformity using cone-beam computed tomography before and at least 6 months after surgery. Thirty soft tissue and two dental landmarks were identified on each three-dimensional facial image, and the asymmetry index of each landmark was calculated. Results were compared with those of 30 normal control subjects (21 women and 9 men, mean age: 26.2 years) with skeletal class I structure. RESULTS:Six months after surgery, the asymmetric index of the lower face and total face decreased significantly (17.8 ± 29.4 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% 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:Bimaxillary surgery for patients with asymmetric class II deformity resulted in a significant improvement in lower face asymmetry. However, approximately 50% of the patients still had residual chin asymmetry. The total face postoperative asymmetry was moderately related to the initial severity of asymmetry. CLINICAL RELEVANCE:These findings could help clinicians better understand orthognathic outcomes on different facial regions for patients with asymmetric class II deformity.

journal_name

Clin Oral Investig

journal_title

Clinical oral investigations

authors

Chen YF,Liao YF,Chen YA,Chen YR

doi

10.1007/s00784-018-2462-6

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

623-632

issue

eissn

1432-6981

issn

1436-3771

pii

10.1007/s00784-018-2462-6

journal_volume

pub_type

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Treatment outcome of bimaxillary surgery for asymmetric skeletal class II deformity.