مقایسه میزان دبری عاجی باقی‌مانده در کانال پس از کاربرد فایل‌های چرخشی Twisted و Flexmaster با استفاده از استریومیکروسکوپ

Introduction: One of the most important steps in root canal therapy is removal of microorganisms presented in the root canal by means of cleaning and shaping with a variety of manual and rotary instruments. The aim of this study was to compare the amount of dentinal debris remained in canal after application of two nickel titanium rotary files(Flexmaster, Twisted) with stereomicroscope. Methods: In this lab-trial study, 60 extracted human premolars were used. After dividing the teeth in two groups,cleaning and shaping of each group was done with one of the twisted files and Flexmaster. After preparation of root canals, the roots were sectioned at 2, 4, and 6 mm from the apex. Stereomicroscopic pictures were prepared. In image J program, the amount of remained debries was calculated by dividing the level of debri presented in each section on the area of canal in each section. The data were analyzed statistically by using SPSS software version 16 by using, paired t test and ANOVA. Results: There was no statistically significant difference in the mean percentage of remained debris between two groups(p>0/05). There was a significant difference in the mean percentage of remained debris in each section of each group(p<0/05). Conclusion:According to the obtained results, there was no significant difference in mean percentage of debris within two groups after preparation of the canal, which indicated that both instrument have the same effect on cleaning of the straight canals.