AN IN-VITRO STUDY COMPARING DENTINAL DEFECTS INDUCED BY DIFFERENT NITI ROTARY FILE SYSTEMS DURING ROOT CANAL PREPARATION.
Keywords:
Mtwo, K3XF, Dentinal defects, Fracture, Partial cracks, Craze lines.Abstract
Aim & Objective- The aim of this in vitro study was to evaluate and compare the dentinal defects caused during root canal preparation using hand K files, rotary Mtwo files, and rotary K3XF files. Methodology- Sixty extracted, intact, non-carious human mandibular premolars were decoronated to a standardized root length of 12 mm and randomly divided into four groups (n = 15 each). Group 1 served as the control group with unprepared canals, while Groups 2, 3, and 4 underwent root canal preparation using hand K files (step back method), rotary Mtwo files (crown-down method), and rotary K3XF files (crown-down method), respectively. During preparation, 5% sodium hypochlorite was used as an irrigant, 17% EDTA gel as a lubricant, and final rinsing was performed with saline and distilled water. All specimens were stored in distilled water until sectioning. Horizontal sections were obtained at 3 mm and 6 mm from the root apex using a hard tissue microtome under water cooling, and the sections were evaluated under a stereomicroscope at 45x magnification for dentinal defects.
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References
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