正畸临床上推磨牙远移一直是开辟牙间隙 ,纠正Ⅱ类牙合关系的一种重要手段 ,多种磨牙远移技术口外力的使用[3～ 5] 口内力[3～ 5] 和活动矫治器的应用[6～ 8] ,均述能达良好稳定的磨牙远移效果 ,但对磨牙远移距离的测量分析上却一直未能提出可比性较好、误差较小的测量方法。 7 Orthodontics Clinically pushing molars has long been the development of tooth space, to correct Class Ⅱ occlusal relationship is an important means of a variety of molar remote surgical techniques [3 ~ 5] intraoral force [3-5] and activities The application of orthodontic appliances [6 ~ 8], both can achieve a good and stable molars remodeling effect, but the measurement of molars distance has not been able to make comparatively good, less error measurement methods. 7