Comparative evaluation of incidence of dentinal defects after root canal preparation using three different endodontic retreatment systems – An in vitro study

Abstract

Context: Safe and efficient removal of all root filling materials from the root canal system without compromising radicular dentin structure is essential for optimal nonsurgical retreatment. Aims: The aim of this study was to evaluate and compare the incidence of dentinal defects caused during root canal filling removal using conventional, rotary, and reciprocating retreatment file systems. Settings and Design: A detailed protocol explaining purpose and procedures of the study was submitted to the Institutional Ethics Committee and ethical clearance obtained. Subjects and Methods: Sixty human maxillary permanent central incisors were collected and decoronated to 12-mm standardized length. The canals prepared up to a master apical file size F3 with Protaper hand files, obturated using AH plus sealer, examined under the stereomicroscope (×40 magnification): Group I: Control (n = 15), Group II: Conventional (n = 15), Group III: Protaper Universal Retreatment Files (n = 15), and Group IV: Reciproc Blue (n = 15). After instrumentation, teeth were sectioned at 3, 6, and 9 mm from the apex to evaluate the presence of dentinal defects under the stereomicroscope. Statistical Analysis Used: Statistics were performed using the SPSS, version, 25 (SPSS Inc., Chicago, IL, USA). Initially, normality test was done using the Shapiro–Wilk test and data were not normally distributed followed by Kruskal–Wallis test. P < 0.05 is considered statistically significant. Results: Maximum percentage increase in dentinal defects was observed in Protaper Universal Retreatment Files followed by Conventional method and Reciproc Blue. Conclusions: Significantly Reciproc Blue reduced the incidence of dentinal defects after root canal preparation.

Comparative evaluation of the effects of different torque settings on dentinal crack formation using single- and multi-file system: An in vitro study

“…[ 15 ] The roots were encased with an elastomeric impression material and acrylic resin to simulate the PDL, which could influence the distribution of forces during root canal preparation. [ 16 ] For irrigation, a 3% solution of NaOCl was selected over a 5% solution since the increased concentration of NaOCl considerably reduces the elastic modulus and flexural the human dentin’s strength. [ 17 ]…”