功能矫治器矫治下颌后缩

Clinical evaluation of the functional appliance therapy of retrusive mandible

目的 评价功能矫治器前导下颌后缩的侧貌美学改变。方法 选用 31例安氏Ⅱ类 1分类下颌后缩病例作为研究对象 ,戴用功能矫治器前导下颌 ,测量软组织美学指标的改变。结果 所有病例的Z角、H角、软组织侧面角、上唇至E线距、上唇长 /下唇长、下颜面高治疗后均接近或达到正常 ,IMPA、下唇至E线距治疗前后无明显改变。结论 功能矫治器前导下颌可使侧貌改善至协调、美观。在评价侧貌美观时 。

Objective To evaluate the lateral profile changes after the functional appliance was used to put forward the mandible. Methods Thirty one cases of maloclusion (subclass Ⅰ of the class Ⅱ) were selected,in which all the mandible were in a backward position revealed by clinical examination and roentgenographic cephalometry.Functional appliance was used to put forward the mandible,and then the changes of IMPA, Z angle, H angle, soft tissue profile angle, upper lip E Line, lower lip E Line, upper lip/lower lip, and lower facial height were compared before and after treatment. Results All of the cases showed up a better improvement of the profile after the functional appliance therapy. Z angle, H angle, soft tissue profile angle, upper Lip E line, upper Lip/lower lip, lower facial height became normal or close to normal.There was a statistical significantce in the changes ( P <0.01). No notable changes happened to IMPA and lower lip E Line. Conclusion The relationship among forehead, lip and chin becomes more harmonized after the functional appliance is used to put forward the mandible. IMPA alone can not be used to evaluate the esthetical change of the profile, and various esthetical index and clinical examination should be considered comprehensively.