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目的:为矫治替牙期骨性Ⅲ类畸形患者设计一种卡环式垫前牵引矫治器,并对其进行疗效分析。方法:从西安交通大学口腔医院2008年1月-2017年1月正畸科门诊采集20例替牙期骨性Ⅲ类畸形患者,由同一人制作的卡环式垫前牵引矫治,矫治器佩戴10个月,将治疗前后患者的头颅定位侧位片分析法测量,再用SPSS 20.0统计软件进行配对t检验。结果:20例患者临床结果统计数据显示:A-Np(mm)、OB(mm)有显著统计学意义(P<0.05);SNA(°)、ANB(°)、Mx L(mm)、Co-A(mm)、Wit′s(mm)、LFH(mm)、OJ(mm)、面突角(°)、UL-E(mm)有非常显著统计学意义(P<0.01)。结论:笔者设计的该卡环式垫前牵引矫治器,简单易做、经济实用;矫治替牙期骨性Ⅲ类畸形患者疗效显著,对上颌发育不足患者矫治效果良好,矫正后上颌骨长度加长、前牙覆覆盖加大、上下颌位置正常、面凸度加大,牙合、颌、面趋向正常型发展,但下面高略有加大,高角型患者慎用。
OBJECTIVE: To design a pre-tensioning appliance for clamping orthodontic patients with skeletal class Ⅲ deformity and to analyze its curative effect. Methods: From January 2008 to January 2017 orthodontic clinics in Xi’an Jiaotong University Stomatological Hospital, 20 cases of osteosarcoid type Ⅲ deformity patients were collected, Wear 10 months, before and after treatment of patients with cephalometric analysis of the lateral slice method, and then SPSS 20.0 statistical software paired t test. Results: The clinical data of 20 patients showed statistically significant (P <0.05); A-Np (mm), OB (mm) There were significant statistical significance (P <0.01) of -A (mm), Wit’s (mm), LFH (mm), OJ (mm), facial protrusion angle (°) and UL-E (mm) Conclusion: The design of the card ring pad before traction appliance, easy to do, economical and practical; orthodontic treatment of skeletal Class Ⅲ deformity patients with significant effect on the maxillary hypoplasia in patients with good correction, orthodontic maxillary length Lengthening, covering the anterior teeth cover increased, the normal jaw position, face convexity increased, occlusal, jaw, facial tend to normal development, but the following slightly higher, caution in patients with high angle.