目的　总结分析固定义齿拆除原因及使用时间为临床提供指导。方法　对我科近年来拆除的 6 5 0件固定义齿的拆除原因及使用时间进行比较讨论。结果　本组病例平均使用年限仅 5 .5年 ,拆除的主要原因是龋损 ,其次是冠磨损。结论　①减少锤冠的应用 ,推广性能更好的修复材料 ;②合理地设计和严格控制适应证 ;③提高制作水平 ;④良好的口腔宣教及定期复查 Objective To summarize and analyze the reason and the use of fixed denture demolition for clinical guidance. Methods The reasons for the demolition of 650 dentures removed in our department in recent years were compared and discussed. Results The average service life of this group of patients was only 5.5 years. The main reason for the demolition was carious lesions, followed by crown wear. Conclusions ① Reduce the application of hammer crown to promote better repair materials; ② Reasonably design and strictly control indications; ③ Improve the production level; ④ Good oral education and regular review