RESUMEN
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.