Subramaniam Priya, Girish Babu K L, Tabrez T A
J Clin Pediatr Dent. 2016;40(2):141-6. doi: 10.17796/1053-4628-40.2.141.
The present SEM study was undertaken to evaluate the effect of root canal instrumentation using both manual and rotary files in the root canals of primary anterior teeth.
Thirty freshly extracted primary maxillary incisors were divided into 3 groups of 10 teeth each. In Group I, root canals were instrumented with rotary NiTi files; in Group II, the root canals were instrumented using manual NiTi K files and; in Group III, manual instrumentation was done with stainless steel K files. Longitudinal sections were prepared and processed for observation under SEM at the coronal, middle and apical thirds. Scoring of smear layer was done according to Hulsmann and the data obtained was subjected to statistical analysis.
Rotary files cleaned the coronal and middle thirds of root canals more effectively. Statistically there was no significant difference between the groups. Lowest score of 2.6 in the apical third of root canals was seen with hand NiTi files.
Rotary instrumentation was as effective as manual instrumentation in removal of smear layer in the root canals of primary anterior teeth.
进行本扫描电子显微镜（SEM）研究以评估在乳牙前牙根管中使用手动和旋转锉进行根管预备的效果。
30颗新鲜拔除的上颌乳切牙被分为3组，每组10颗牙。在第一组中，根管使用旋转镍钛锉进行预备；在第二组中，根管使用手动镍钛K锉进行预备；在第三组中，使用不锈钢K锉进行手动预备。制备纵向切片并进行处理，以便在SEM下观察根管的冠部、中部和根尖三分之一处。根据胡尔斯曼方法对玷污层进行评分，并对所得数据进行统计分析。
旋转锉更有效地清洁了根管的冠部和中部三分之一。统计学上，各组之间无显著差异。手动镍钛锉在根管根尖三分之一处的得分最低，为2.6分。
在乳牙前牙根管中，旋转预备在去除玷污层方面与手动预备效果相同。
