Influence of temporomandibular joint disc displacement on mandibular advancement in patients without pre-treatment condylar resorption

详细信息    查看全文

• 作者：Z. Miao¹ ; ² ; X.-d. Wang³ ; L.-x. Mao¹ ; Y.-h. Xia¹ ; L.-j. Yuan¹ ; M. Cai³ ; J.-q. Liu¹ ; B. Wang¹ ; X. Yang¹ ; L. Zhu⁴ ; H.-b. Yu³ ; B. Fang¹ ; ^{fangbing@sjtu.edu.cn}
• 关键词：disc displacement ; skeletal class II malocclusion ; Le Fort I and BSSRO ; mandibular stability
• 刊名：International Journal of Oral and Maxillofacial Surgery
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：46
• 期：3
• 页码：328-336
• 全文大小：1055 K
• 卷排序：46

文摘

The purpose of this study was to clarify the correlation between pre-treatment anterior disc displacement and mandibular stability after orthognathic and orthodontic treatment among patients with a skeletal class II malocclusion and without pre-treatment condylar resorption. Thirty-seven patients were included (7 male, 30 female). The mean length of follow-up was 6.76 ± 3.06 years. Patients with condylar resorption before treatment were excluded. Magnetic resonance images and lateral cephalometric radiographs were taken before treatment (T0), after treatment (T1), and at follow-up (T2). Patients were classified according to the degree of disc displacement: −10–10° ‘normal’, 11–50° ‘slight to mild’, ≥51° ‘moderate to severe’. Results showed the condyle moved posterosuperiorly after treatment, and then moved anteriorly to a more concentric location during the long follow-up period. Condylar movement was found not to correlate with disc displacement. The degree of disc displacement before treatment did not correlate with the post-surgical mandibular positional change in either the sagittal or vertical direction. To conclude, the mandibular bilateral sagittal split ramus osteotomy was stable in the long-term after orthognathic and orthodontic treatment. In the absence of pre-treatment condylar resorption, the degree of initial anterior disc displacement did not have a significant influence on the stability of mandibular advancement.