中文摘要：

目的分析归纳单纯型多数恒牙先天缺失患者常见的缺牙模式，为寻找临床治疗和基础研究的常见缺牙模式提供依据。方法收集64例单纯型多数恒牙先天缺失患者的病史、口腔检查及曲面体层x线片等资料，使用缺牙代码法分析患者各象限的缺牙模式。结果上、下颌最常见的缺牙模式均为前牙、前磨牙的缺失，下颌5种常见缺牙模式共占总数的52％（33／64）（右侧）及53％（34／64）（左侧）；上颌最常见的8种缺牙模式占总数的63％（40／64）（右侧）及58％（37／64）（左侧）。结论多数恒牙先天缺失患者的缺牙类到为常卵．缺牙类型。

英文摘要：

Objective To analyze the common dental agenesis patterns of the oligodontia patients. Methods The information of 64 oligodontia patients was collected, including the histories, oral examinations and panoramic radiographs. The Tooth Agenesis Code （TAC） procedure was used to analyze the agenesis pattern of each quadrant. Results In the maxilla, 63% （40/64） （right side ） and 58% （37/64） （ left side） could be described using eight different patterns. The most common pattern was agenesis of the maxillary lateral incisor, canine and both premolars. In the mandible, 52% （33/64） （right side ） and 53% （34/64） （ left side） of the patients could be described using only five different patterns, the most common pattern was agenesis of both mandibular premolars. Conclusions Common patterns of tooth agenesis were successfully identified in non-syndromic oligodontia patients.