伴功能性因素前牙反[牙合]矫治前后下颌位置的头影测量分析

Cephalometric study on mandibular positions of functional anterior crossbite before and after treatment

目的:分析伴功能因素前牙反患者矫治前牙尖交错位、下颌后退至切牙对刃位与矫治结束后牙尖交错位3种不同位置的相关关系。方法:对18例前牙反伴下颌能后退至切对切的患者,采用固定矫治技术进行矫治。拍摄矫治之前牙尖交错位(T1)、下颌后退至切牙对刃位(T2)及矫治结束牙尖交错位(T3)X线头颅侧位片。采用方差分析对相关X线头影测量项目结果 3组数据间进行相互比较,进行检验分析。结果:经平均25个月的治疗,前牙的反得以矫治,磨牙关系为I类,SNB、ANB、MP-FH、MP-SN、U1-SN、L1-MP、Y轴角、ANS-Me这几项测量项目的 3组数据之间的F检验结果有统计学意义。结论:伴功能性因素前牙反经固定矫治技术治疗后,在矢状向和垂直向上下颌骨位置处于治疗前牙尖交错位与后退至切牙对刃位之间,且更接近于后退位。

Objective： To analysis the relationship of cephalometric measurements from intercuspal position（before and after treatment） and retruded contact position（before treatment）. Methods： 18 cases with Class III malocclusion were treated using MBT straight wire appliance technique,all the incisal relationships could be edge-to-edge when the mandible was retruded,X-ray films of intercuspal position and retruded contact position before treatment and intercuspal position after treatment were taken. The cephalometric measurements were statistically analysed by ANOVA. Results： After 25 months treatment the anterior crossbite were corrected in all cases. The molar relationship were class Ⅰ. The measurements of SNB,ANB,MP-FH,MP-SN,U1-SN,L1-MP,Y-axis angle and ANS-Me were significantly changed. Conclusion： After the treatment of Class III malocclusion by MBT straight wire appliance,the sagittal and vertical mandibular location can be between intercuspal position and retruded contact position of pretreatment,and it is more close to the retruded contact position.