Gustavo De-Deus1, Felipe Gonçalves Belladonna2, Erick Miranda Souza3, Emmanuel João Nogueira Leal Silva4, Aline de Almeida Neves5, Haimon Alves6, Ricardo Tadeu Lopes6, Marco Aurélio Versiani7. 1. Department of Endodontics, Grande Rio University, Duque de Caxias, Rio de Janeiro, Brazil. Electronic address: endogus@gmail.com. 2. Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil. 3. Department of Dentistry II, Federal University of Maranhão, São Luís, Maranhão, Brazil. 4. Department of Endodontics, Grande Rio University, Duque de Caxias, Rio de Janeiro, Brazil. 5. Department of Pediatric Dentistry and Orthodontics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. 6. Nuclear Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. 7. Department of Restorative Dentistry, Dental School of Ribeirão Preto, University of Sao Paulo, Ribeirão Preto, Brazil.
Abstract
INTRODUCTION: The aim of the present study was to evaluate the frequency of dentinal microcracks observed after root canal preparation with ProTaper Next (PTN; Dentsply Maillefer, Ballaigues, Switzerland) and Twisted File Adaptive (TFA; SybronEndo, Orange, CA) systems through micro-computed tomographic analysis. METHODS:Twenty moderately curved mesial roots of mandibular molars presenting a type II Vertucci canal configuration were randomly assigned to 2 experimental groups (n = 10) according to the system used for the root canal preparation: PTN or TFA systems. The specimens were scanned through high-resolution micro-computed tomographic imaging before and after root canal preparation. Afterward, pre- and postoperative cross-sectional images of the mesial roots (N = 25,820) were screened to identify the presence of dentinal defects. RESULTS:Dentinal microcracks were observed in 38.72% (n = 5150) and 30.27% (n = 3790) of the cross-sectional images in the PTN and TFA groups, respectively. All dentinal defects identified in the postoperative scans were already present in the corresponding preoperative images. CONCLUSIONS: Root canal preparation with PTN and TFA systems did not induce the formation of new dentinal microcracks.
RCT Entities:
INTRODUCTION: The aim of the present study was to evaluate the frequency of dentinal microcracks observed after root canal preparation with ProTaper Next (PTN; Dentsply Maillefer, Ballaigues, Switzerland) and Twisted File Adaptive (TFA; SybronEndo, Orange, CA) systems through micro-computed tomographic analysis. METHODS: Twenty moderately curved mesial roots of mandibular molars presenting a type II Vertucci canal configuration were randomly assigned to 2 experimental groups (n = 10) according to the system used for the root canal preparation: PTN or TFA systems. The specimens were scanned through high-resolution micro-computed tomographic imaging before and after root canal preparation. Afterward, pre- and postoperative cross-sectional images of the mesial roots (N = 25,820) were screened to identify the presence of dentinal defects. RESULTS: Dentinal microcracks were observed in 38.72% (n = 5150) and 30.27% (n = 3790) of the cross-sectional images in the PTN and TFA groups, respectively. All dentinal defects identified in the postoperative scans were already present in the corresponding preoperative images. CONCLUSIONS: Root canal preparation with PTN and TFA systems did not induce the formation of new dentinal microcracks.