正常汉族成年人前牙区牙槽宽度及根尖位置的研究

目的研究正常[牙合]成人前牙根尖与周围骨皮质的位置关系，为正畸矫治设计、筛选根吸收高危人群和预防医源性并发症等提供指导。方法选择正常拾青年98人，男女各半，年龄范围17～25岁，平均年龄20．29岁。拍摄头颅侧位定位片，测量并计算反映上下颌切牙根尖到周围骨皮质位置关系的12项指标及下颌平面角。建立上述测量指标的均值范围；相关分析研究下颌平面角对其影响。结果（1）建立正常[牙合]男女根尖位置及牙槽宽度的均值。（2）男性组中SN／MP与UH、UH／UW正相关，与UP负相关；女性组中SN／MP与LW负相关。结论（1）正常汉族成年人上下颌前牙牙槽骨宽度及根尖相对皮质骨位置比较稳定。（2）下颌平面角对根尖位置及牙槽宽度有一定影响。

A study of anterior root apex position and alveolar width of Han Race adults with normal occlusion

Objective To quantify the position of the incisor apex of Han race adults with normal occlusion;to see the relationships between the position of the incisor apex and the mandibular plane angle. Methods The sample consisted of 98 Han race adults with normal occlusion,mean 20.29 years old(17- 25 years),half of them are male.12 measurements were made on the lateral cephalograms,which represented the positional relationship between the incisor apex and the cortical bone around.The mandibular plane angle was mea...