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

VernacularTitle: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
Author: Lihui YAN ; Xinghui QU ; Daofeng LAI ; Xiaomin ZHANG ; Yuelan ZHANG
Publication Type:Journal Article
Keywords: Anterior crossbite; Class Ⅲ malocclusion; Cephalometrics
From: Journal of Practical Stomatology 2014;(6):813-818
CountryChina
Language:Chinese
Abstract: Objective:To analysis the relationship of cephalometric measurements from intercuspal position(before and after treat-ment)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 intercus-pal position and retruded contact position before treatment and intercuspal position after treatment were taken.The cephalometric meas-urements 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.