Walker T L, del Rio C E
Endodontics Department, Naval Dental Clinic, Norfolk, VA.
J Endod. 1991 Feb;17(2):66-71. doi: 10.1016/S0099-2399(06)81610-9.
Twenty extracted human mandibular first and second molars with mesial canal curvatures of 18 to 35 degrees were randomly divided into two groups. Following routine endodontic access and canal length determination one of the mesial root canals was ultrasonically instrumented, using tap water in the first group or 2.6% sodium hypochlorite irrigation in the other. In both groups the other mesial canal was used as a control. The mesial roots were decalcified, serially sectioned, and stained with hematoxylin and eosin. Wall planing and soft tissue debridement were blindly evaluated using the light microscope. Mean canal wall planing and soft tissue debridement scores were compared by multiple t tests. Sodium hypochlorite, in conjunction with ultrasonic instrumentation, was more effective than tap water in wall planing when the entire root length was considered. Sodium hypochlorite, in conjunction with ultrasonic instrumentation, was more effective than tap water in soft tissue debridement in the middle third of the canal. Both irrigants were ineffective in conjunction with ultrasonic instrumentation in removing soft tissue from the main canal, the isthmus between canals, the canal fins, and the multiple branches or deltas often encountered in the apical one-third of the canal.
选取20颗拔除的人下颌第一和第二磨牙，其近中根管弯曲度为18至35度，随机分为两组。在进行常规牙髓腔开髓和根管长度测定后，一组对其中一条近中根管使用超声波器械预备，冲洗液为自来水；另一组使用2.6%的次氯酸钠冲洗。两组中另一条近中根管作为对照。将近中根脱钙、连续切片，并用苏木精和伊红染色。使用光学显微镜对根管壁刨削和软组织清创情况进行盲法评估。通过多次t检验比较平均根管壁刨削和软组织清创评分。当考虑整个牙根长度时，次氯酸钠结合超声波器械预备在根管壁刨削方面比自来水更有效。在根管中三分之一段的软组织清创方面，次氯酸钠结合超声波器械预备比自来水更有效。在结合超声波器械预备从主根管、根管间峡部、根管嵴以及根管根尖三分之一段常见的多个分支或根管分歧处清除软组织方面，两种冲洗液均无效。
