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

Bayram H. M., Bayram E., Ocak M., Uygun A. D., Çelik H. H.

JOURNAL OF ENDODONTICS, vol.43, no.7, pp.1166-1169, 2017 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 43 Issue: 7
  • Publication Date: 2017
  • Doi Number: 10.1016/j.joen.2017.02.005
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1166-1169
  • Keywords: Dentinal defects, micro-computed tomographic imaging, microcracks, nickel-titanium file system, root canal preparation, ROOT-CANAL PREPARATIONS, CRACK FORMATION, UNIVERSAL, RECIPROCATION, MOVEMENT, SYSTEMS
  • Ankara University Affiliated: Yes


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.