唇挡矫治替牙期牙性Ⅱ类错(牙合)伴轻中度拥挤30例疗效分析

Study on effects of orthopedic treatment for Class Ⅱ and mild-moderate crowded malocclusion caused in the mixed dentition period with lip bumper

目的探讨唇挡对替牙期牙性Ⅱ类错(牙合)伴轻中度拥挤的矫治效果。方法选择2010年1月至2011年3月大庆总医院集团五官医院口腔正畸科门诊就诊的替牙期牙性Ⅱ类错(牙合)伴拥挤患者30例,所有患者上颌均采用唇挡功能矫治器矫治,矫治前、后均取石膏模型,摄X线头颅定位侧位片。对矫治前后的模型数据及X线头影测量数据进行分析。结果矫治完成后,模型测量结果显示:拥挤度变小,牙弓弧形总长度(TAL)、牙弓长度(AD)变大,差异均有统计学意义(P<0.05);X线头影测量结果显示:SNA角(由蝶鞍中心、鼻根点及上齿槽座点所构成的角)、ANB角(由上齿槽座点、鼻根点及下齿槽座点所构成的角)变大,ptm-6距(翼上颌裂点与上第一恒磨牙颊沟点在FH平面上垂足间的距离)变小,差异均有统计学意义(P<0.05)。结论唇挡对替牙期牙性Ⅱ类错(牙合)伴轻中度拥挤有明显的矫形效果。

Objective To study the effects of orthopedic treatment with lip bumper on Class II and mild-moderate crowded malocclusion caused in the mixed dentition period. Methods Thirty cases of Class II and mild-moderate crowded malocclusion were treated with lip bumper, and analysis of cephalometric and model measurements were done before and after treatment. Results After treatment, TAL and AD increased, and the crowding reduced ; SNA and ANB increased, and ptm-6 reduced, the difference being significant（P〈0.05）. Conclusion The lip bumper has the evident orthopedic effects on Class II and mild-moderate crowded malocclusion.