Acta Scientific Dental Sciences

Research ArticleVolume 2 Issue 6

Comparison of Dentinal Microcrack Formation during Root Canal Preparation by Niti Rotary Instruments and the Self-Adjusting File - An In Vitro Study

Kinjal Gathani, Srinidhi Surya Raghavendra* and Pratik Kotadia

Department of Conservative Dentistry and Endodontics, Sinhgad Dental College and Hospital, Pune, India

*Corresponding Author: Srinidhi Surya Raghavendra Department of Conservative Dentistry and Endodontics, Sinhgad Dental College and Hospital, Pune, India.

Received: April 21, 2018; Published: May 09, 2018

Citation: Kinjal Gathani., et al. Comparison of Dentinal Microcrack Formation during Root Canal Preparation by Niti Rotary Instruments and the Self-Adjusting File - An In Vitro Study Acta Scientific Dental Sciences 2.6 (2018).

Abstract

Introduction: Techniques for biomechanical preparation of the root canal employ various methods like use of hand files, rotary endodontic files, sonic and ultrasonic preparation among others. Rotary root canal instrumentation has the potential to induce dentinal damage and to generate cracks on the apical surface. Self-Adjusting File (SAF) has a novel design with a compressible NiTi lattice framework and provision for continuous irrigation through the hollow core.

Aim: The purpose of the present study is to compare the dentinal microcrack formation with three different NiTi rotary files (Pro Taper Universal, Heroshaper, Mtwo) and the SAF.

Materials and Method: 75 mandibular first molars were selected. Teeth were decoronated and distal roots of all teeth were removed by using diamond coated bur at high speed with water cooling, leaving mesial roots approximately 11 mm in length. Canal patency was established with a #10 K-File in both mesiobuccal and mesiolingual canals. Group I - Hand K-files (HF), Group 2 - ProTaper Universal (PT), Group 3 - Heroshaper (HS), Group 4 – Mtwo, Group 5 – SAF. Biomechanical preparation of mesial roots was completed. Root sections perpendicular to the long axis were done at 3, 6, and 9 mm from the apex. Digital images of each section were taken using the operating microscope at 24x magnification. Statistical analysis was done using Chi-square and Fisher exact tests and results were tabulated.

Results: Group 5 (SAF) showed significantly less cracks. (p < 0.05) when compared to group 2 (PT), group 3 (HS), group 4 (Mtwo). However, there was no statistically significant difference in the incidence of cracks between group 2 (PT), group 3 (HS) and group 4 (Mtwo) (p > 0.05).

Conclusion: All the rotary files used had comparable dentin microcrack formation. The SAF had significantly lesser incidence of crack formation than the rotary files.

Keywords: Dentin Microcrack; Heroshaper; Mtwo; Pro Taper Universal; Self-Adjusting File

Copyright: © 2018 Srinidhi Surya Raghavendra., et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.



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