作者对50例外科矫正下颌前突的成人病例进行了分析研究。于术前、术后及去除夹板后至少一年,即硬组织位置较为稳定时,分别摄照X线头颅侧位像,测量代表上下颌位置及其对颅底关系的SNA角(蝶鞍中心—鼻根点—上齿槽座点角),SNB角(蝶鞍中心—鼻根点—下齿槽座点角),ANB角(上 The authors analyzed 50 adult cases of surgical correction of mandibular protrusion. At preoperative, postoperative and at least one year after removal of the splint, when the location of the hard tissue was relatively stable, the X-ray cephalometric images were taken and the SNA angle representing the position of the maxilla and mandible and its relationship to the skull base was measured - Nasal root point - upper cusp seat angle), SNB angle (sella center - nasal root point - lower cusp seat angle), ANB angle (on