我科从 1995～ 1998年共拔除下颌阻生牙 43 5颗 ,干槽症的发生率为 13 .6% ,与国内报道为 14 .2 %相近 ,比一般磨牙干槽症发生率 2 .7%高。现分别从创伤因素、感染因素、解剖因素及全身因素四方面进行分析探讨。1　临床资料与结果我科 4年来共拔除下颌阻生智齿 43 5颗 ,其中男 From 1995 to 1998, our department removed a total of 435 mandibular impacted teeth. The incidence of dry socket disease was 13.6%, which was similar to the 14.2% reported in China, and the incidence of dry socket symptoms was 2.7% %high. Now from the traumatic factors, infectious factors, anatomical factors and systemic factors in four aspects of analysis and discussion. 1 clinical data and results in our department over the past 4 years to remove the mandibular impacted wisdom teeth 43 5, of which male