论文部分内容阅读
目的:分析使用生理性支抗控制PASS矫治器矫治前后颅颌硬组织的变化。方法:选取拔除上下4颗第一前磨牙后应用PASS矫治器治疗的病例20例,X线头颅侧位片进行分析并测量15项硬组织项目,分析治疗前后硬组织的变化。结果:矫治后的硬组织改变主要为上前牙唇倾的角度及距离的减小,上唇突度有一定改善;ANB减小及上下前牙交角增大,下切牙到NB的距离减小,下唇的位置有所改变。结论:牙列拥挤不齐和前牙唇倾前突的病例使用PASS矫治器治疗后能够有效地改善上下切牙的位置及关系及侧面容貌。
Objective: To analyze the changes of cranial and mandibular structures before and after orthodontic treatment with PASS appliance using physiological support. Methods: Twenty cases of PASS appliance were treated with removal of upper and lower first premolar teeth, X-ray cephalograms were taken and 15 hard-tissue items were measured to analyze the changes of the hard tissue before and after treatment. Results: The change of the hard tissue after the correction was mainly the decrease of the angle and the distance of the upper lip and the improvement of the upper lip protrusion. The decrease of the ANB and the increase of the angle between the upper and lower front teeth and the decrease of the distance from the lower incisor to the NB, The location of the lower lip has changed. Conclusions: The crowded dentition and the anterior protrusion of the anterior lip with the PASS appliance can effectively improve the position, the relationship and the side appearance of the upper and lower incisors.