The labial crown inclination of upper incisors was larger, but the lingual crown inclination of upper and lower canines was smaller. 牙冠转矩:上颌中、侧切牙的唇向倾斜度较美国人大,而上、下尖牙的舌向倾斜度较小。
Results After treatment, the labial inclination of upper and lower incisors was reduced. The occlusal plane angle was increased and molars were extruded. 结果AngleⅡ1病例矫治后的硬组织改变主要表现为上下切牙唇倾度的减小,(牙合)平面角的增加及磨牙的伸长;
Conclusion Labial inclination of incisors can be effectively prevented with use of elastic traction and bend back of arch wire. 结论平直弓丝矫治技术排齐阶段使用弹性链状圈远中移动尖牙配合弓丝末端回弯,可有效预防切牙唇倾,加快排齐的速度。