The incidence of dentinal microcracks caused by hand versus different rotary instruments after biomechanical preparation: an in vitro study

Introduction: The objective of this study was to evaluate the behaviour of different stainless steel and NiTi instruments on root canal dentin. Materials and Methods: Fifty single-rooted premolars were selected. All specimens were decoronated and divided into one control and four experimental groups, each group having 10 samples. Group I is control group, Group II: Hand K-files (Mani), Group III: Pro Taper Universal (PT; Dentsply Maillefer), Group IV: Mtwo (VDW, Munich, Germany), and Group V: Hyflex (Coltene-Whaledent, Allstetten, Switzerland). Roots of each sample were sectioned at 3, 6, and 9mm from the apex and were then viewed under a stereomicroscope to evaluate the presence or absence of dentinal defects. Results: In roots prepared with hand files (HFs) showed lowest percentage of dentinal defects than all the experimental rotary systems. The data was statistically analysed. Conclusion: Within the limitations of this in vitro study, some endodontic preparation methods might damage the root and induce dentinal defects. *Corresponding Author Dr. Neetu Jindal Professor Department of Conservative Dentistry & Endodontics Surendera Dental College and Research Institute, Sri Ganganagar. wjpls, 2016, Vol. 2, Issue 2, 145-153 Research Article ISSN 2454-2229 World Journal of Pharmaceutical and Life Sciences WJPLS www.wjpls.org SJIF Impact Factor: 3.347