目的研究中老年人群牙齿慢性损伤性改变———楔状缺损和磨损的发生情况，以及二者的关系。方法采用Ｓｍｉｔｈ和Ｋｍｉｇｈｔ牙齿磨损指数ＴＷＩ分度方法，对５０１名中老年干部进行了口腔检查。结果该组人群楔状缺损患病率为８９６２％，磨损发生率为１００００％。发生率和病损程度均与年龄和牙位有关，磨损程度重的患者楔状缺损程度也重。结论楔状缺损与磨损是中老年人常见的牙病，二者之间发生因素有相同之处，但程度加重的因素不一致 Objective To study the chronic injury of teeth in middle-aged and elderly people --- the occurrence of wedge-shaped defects and wear, and the relationship between the two. Methods A total of 501 middle-aged and elderly cadres underwent dental examination using the Smith and Kmight TWI indexing methods. Results The prevalence of wedge-shaped defect in this group was 8962% and the incidence of wear was 10000%. The incidence and severity of lesions were all related to age and dental location, and wedge-shaped defects were more common in those with more severe injuries. Conclusions Wedge-shaped defects and wear are common dental problems in middle-aged and elderly people, with similarities between the two factors, but the degree of aggravating factors is inconsistent