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对宁波市城乡1440名中老年人进行缺牙及修复情况调查，结果发现：①总缺牙率为64．51％，缺牙均数5.96颗，缺牙率和均数随年龄增大而增高，女性明显大于男性，农村高于城市（P＜0．01）。②缺牙部位中年组主要集中在区，老年组则分布均一，左右基本对称，下颌多于上颌，后牙多于前牙。③在929例缺牙中，有活动义齿122件，固定义齿316件，全口义齿147件，未修复率达64．26％，不良修复体80件，占13.68％。本文对缺牙的原因，修复情况以及有关问题进行分析。
A survey of 1440 middle-aged and elderly people in urban and rural areas of Ningbo City was carried out. The results showed that: (1) the total missing tooth ratio was 64.51%; the number of missing teeth was 5.96; the number of missing teeth and mean number increased with age , Women were significantly greater than men, rural areas than cities (P <0.01). ② In the middle-aged group, the middle-aged teeth were mainly located in the area, and the aged group was evenly distributed with the symmetry around, the mandible was more than the maxillary and the posterior teeth were more than the anterior teeth. ③ In 929 cases of missing teeth, there were 122 movable dentures, 316 fixed dentures, 147 complete dentures, 64.26% of unmachined prostheses and 80 cases of poor prosthesis, accounting for 13.68%. This article analyzes the causes, repairs and related problems of missing teeth.