不同冲洗液对根尖溢出碎屑的影响

目的： 比较根管预备后不同冲洗液对根尖溢出碎屑的影响。方法：58颗正畸拔除的单根牙随机分为4组,常规根管预备后,采用不同冲洗液冲洗,对照组(A组)：7颗、蒸馏水冲洗;实验组每组17颗,B组：1% NaOCl冲洗;C组：2.5% NaOCl冲洗;D组：17% EDTA冲洗。收集冲洗后的冲洗液,通过紫外可见分光光度计检测吸光度（OD）值,比较其根尖溢出碎屑的含量。采用SPSS 13.0软件包对结果进行统计学分析。结果：冲洗前、后的OD差值分别为对照组A组0.012、B组0.122、C组0.393、D组0.021,B、C、D 3组冲洗前、后的差值与对照组相比,均有显著差异（P<0.05）。其中,C组最高,与B、D 2组相比,均差异显著（P<0.05）。结论：冲洗液能增加根尖溢出碎屑的含量,2.5%NaClO冲洗液产生较多的根尖溢出碎屑,1% NaOCl、17%EDTA溶液是临床上较理想的冲洗液。

The effect of various irrigants on apically extruded debris: an in vitro study

PURPOSE: To compare the amount of debris extruded apically from root canals when different irrigants were used. METHODS: Fifty-eight extracted single-rooted human mandibular premolars with straight root canals were used. The teeth were randomly divided into control group (group A, n=7) and 3 experimental groups (group B,C,D,n=17). All teeth were prepared for root canal therapy, and 3 different irrigants were used (group B: 1% sodium hypochlorite; group C: 2.5% sodium hypochlorite; group D: 17% EDTA). Debris extruded from the apical foramen during root canal irrigation was collected into tubes and the amount of debris extruded was counted and analyzed. Statistical significance was assessed by Student-Newman-Keuls test with SPSS 13.0 software package. RESULTS: Group B, C, D had more amount of extruded debris, which was significantly different from the control group (P<0.05). Group C had the highest amount of extruded debris,which was significantly different from the other group (P<0.05). CONCLUSIONS: The type of irrigants used can affect the amount of apically extruded debris. 2.5% sodium hypochlorite can produce more apically extruded debris. 1% sodium hypochlorite and 17% EDTA are better than 2.5% sodium hypochlorite in terms of irrigation efficacy.