Effect of ProTaper Gold, Self-Adjusting File, and XP-endo Shaper Instruments on Dentinal Microcrack Formation: A Micro-computed Tomographic Study.

Autor:	Bayram HM; Department of Endodontics, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkey., Bayram E; Department of Endodontics, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkey. Electronic address: bayremre@yahoo.com., Ocak M; Department of Anatomy, Faculty of Medicine, Hacettepe University, Ankara, Turkey., Uygun AD; Department of Endodontics, Faculty of Dentistry, Recep Tayyip Erdogan University, Rize, Turkey., Celik HH; Department of Anatomy, Faculty of Medicine, Hacettepe University, Ankara, Turkey.
Jazyk:	angličtina
Zdroj:	Journal of endodontics [J Endod] 2017 Jul; Vol. 43 (7), pp. 1166-1169. Date of Electronic Publication: 2017 May 02.
DOI:	10.1016/j.joen.2017.02.005
Abstrakt:	Introduction: The aim of the present study was to evaluate the frequency of dentinal microcracks observed after root canal preparation with ProTaper Universal (PTU; Dentsply Tulsa Dental Specialties, Tulsa, OK), ProTaper Gold (PTG; Dentsply Tulsa Dental Specialties), Self-Adjusting File (SAF; ReDent Nova, Ra'anana, Israel), and XP-endo Shaper (XP; FKG Dentaire, La Chaux-de-Fonds, Switzerland) instruments using micro-computed tomographic (CT) analysis. Methods: Forty extracted human mandibular premolars having single-canal and straight root were randomly assigned to 4 experimental groups (n = 10) according to the different nickel-titanium systems used for root canal preparation: PTU, PTG, SAF, and XP. In the SAF and XP groups, the canals were first prepared with a K-file until #25 at the working length, and then the SAF or XP files were used. The specimens were scanned using high-resolution micro-computed tomographic imaging before and after root canal preparation. Afterward, preoperative and postoperative cross-sectional images of the teeth were screened to identify the presence of dentinal defects. For each group, the number of microcracks was determined as a percentage rate. The McNemar test was used to determine significant differences before and after instrumentation. The level of significance was set at P ≤ .05. Results: The PTU system significantly increased the percentage rate of microcracks compared with preoperative specimens (P < .05). No new dentinal microcracks were observed in the PTG, SAF, or XP groups. Conclusions: Root canal preparations with the PTG, SAF, and XP systems did not induce the formation of new dentinal microcracks on straight root canals of mandibular premolars. (Copyright © 2017 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.)
Databáze:	MEDLINE
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