后牙根管预备两种手动方法的临床效果比较

目的 评估后牙根管预备两种手动方法的临床效果.方法 选取牙髓炎或根尖周炎的磨牙106例,随机分为步进法组和步退法组,用手动ISO不锈钢K型根管扩孔钻、锉预备根管,比较两组术后根管治疗期间疼痛（EIP）发生情况及根管充填效果.结果 步进法组和步退法组EIP的发生率分别为21.15%和42.59%,两组间差异有统计学意义（P＜0.05）.根管充填情况差异无统计学意义（P＞0.05）.结论 步进法手动ISO不锈钢K型根管扩孔钻、锉预备根管的临床效果较步退法佳.

The Comparison Between two Techniques with Hand Instrument in Posterior Teeth's Root Canal Preparation

Objective To evaluate the value of two techniques with hand instrument in posterior teeth's root canal preparation.Methods 106 molars with pulpal and/or periapical involvement were randomly divided into two groups for root canal preparation,using stainless steel hand files-Flexo-File.One group was treated by step-down technique,the other group was treated by step-back technique. The incidence and degree of EIP in the two groups were recorded,and root canal filling's shapes were observed.Results In step-down group the incidence of EIP was 21.15%,while 42.59% of the teeth developed EIP after step-back group.The difference between two groups was statistically significant(P<0.05).There was not statistically significance(P>0.05) in root canal filling's shape between two groups.Conclusion Root canal preparation on posterior teeth with stainless steel hand files by step-down technique generated less EIP.