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目的探讨轻力前牵引联合扩弓矫治器矫治替牙期骨性Ⅲ类错畸形的临床效果。方法选取替牙期骨性Ⅲ类错畸形30例,随机分为两组各15例。观察组采用轻力前牵引(每侧施力120~150 g)联合活动扩弓矫治器治疗,对照组采用传统前牵引力(每侧施力400~500 g)联合扩弓矫治器治疗。两组治疗前后常规拍摄头颅定位侧位片并进行X线头影测量分析。结果经过5~11个月(平均8.5个月)临床治疗,两组临床矫治效果均满意。头影X线检测指标两组治疗前后比较均有统计学差异(P<0.05或<0.01);治疗后两组上述指标比较无统计学差异(P均>0.05)。结论轻力前牵引联合活动扩弓矫治器治疗替牙期骨性Ⅲ类牙畸形可以获得良好疗效。
Objective To investigate the clinical effect of light traction combined with augmentation appliance in the treatment of skelet class Ⅲ malocclusion. Methods 30 cases of skeletal class Ⅲ malocclusion were selected and randomly divided into two groups of 15 cases each. The observation group was treated with light pre-traction (force of 120-150 g per side) combined with active augmentation appliance. The control group was treated by traditional pre-traction (exerting 400-500 g per side) combined with augmentation appliance. Before and after treatment, the two groups were routinely taken cephalometric lateral radiographs and analyzed by X-ray cephalometry. Results After 5 to 11 months (mean 8.5 months) of clinical treatment, the clinical effects of both groups were satisfactory. There was significant difference between the two groups before and after the treatment (P <0.05 or <0.01). There was no significant difference between the two groups after treatment (P> 0.05). Conclusions The pre-mild traction combined with active augmentation appliance has good curative effect in treating periodontal type Ⅲ dental deformity.