Abstract

Background: This in vitro study aims to compare rotary fles (Fanta and Zuanba) with manual K fles according to the amount of dentin removed and canal transportation in primary mandibular second molars by CBCT images.

Methods: This experimental study was conducted on 60 extracted human second primary molars. That were divided into three groups according to root canal preparation group "I" instrumented with manual K-fles, group "II" instrumented with rotary Fanta fles, and group "III" instrumented with rotary Zuanba fles. After root canal preparation, teeth were scanned before and after mechanical preparation with CBCT scanner. Then the amount of dentin removed was determined at three levels, including the coronal, middle and apical levels. Data were statically analysed using the Kruskal–Wallis test.

Result: No statistically signifcant diference in the amount of dentin removed were noted between the manual and the rotary groups at the coronal and apical RC levels (P=0.420) and (P=0.819) respectively but signifcant diference was noted at the middle third (P=0.043). Regarding RC transportation, no signifcant diference was noted among the three groups with the exception of the apical RC level (P=0.043).

Conclusion: Although no signifcant diferences were noted between rotary and manual fles, the rotary fles showed better performance.