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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The Effect of Larger Apical Preparations in the Danger Zone of Lower Molars Prepared Using the Mtwo and Reciproc Systems

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Author(s):
Sant'Anna Junior, Arnaldo [1] ; Cavenago, Bruno Cavalini [1] ; Ordinola-Zapata, Ronald [1] ; De-Deus, Gustavo [1] ; Bramante, Clovis Monteiro [1] ; Hungaro Duarte, Marco Antonio [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent Endodont & Dent Mat, Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF ENDODONTICS; v. 40, n. 11, p. 1855-1859, NOV 2014.
Web of Science Citations: 10
Abstract

Introduction: The aim of this study was to evaluate the effects of large apical preparations in the danger zones of the mesial root canals of mandibular molars instrumented with the Mtwo and Reciproc systems (VDW, Munich, Germany) until reaching apical diameters of 0.25 and 0.40 mm. Methods: Twelve mandibular molars, the mesial roots of which presented distinct foramens and similar anatomies, were selected using micro computed tomographic scanning. Mtwo and Reciproc instruments were used to shape the mesiobuccal or mesiolingual canals. The mesial canals were scanned before and after the use of 0.25- and 0.40-mm Mtwo and Reciproc instruments. The analyzed parameters included the root canal volume and remaining dentin thickness at 5 different levels. The obtained data were subjected to paired analysis of variance and Tukey or Friedman and Dunn tests for intragroup analysis and the Mann-Whitney U test for comparison between the mesial and distal walls. Results: There were no significant differences between the mesial and distal dentin thickness for the points analyzed with both instrumentation techniques (P > .05). The volumetric analysis revealed a significant difference (P < .05) among the initial volume and after the use of the 0.25- and 0.40-mm instruments for both systems. The use of the 0.40-mm instrument increased the root canal volume in comparison to the 0.25-mm instrument (P < .05). Conclusions: Both systems performed similarly for the preparation of curved root canals with separate apical foramens. The increase of the root canal preparation with the 0.40-mm instrument significantly increased the root canal volume at the apical third without significantly reducing the dentin thickness in the danger zone for both instrument systems. (AU)

FAPESP's process: 11/18272-1 - The effect of using phytotherapics and propolis in physicochemical properties, antimicrobial and biocompatibility of MTA
Grantee:Bruno Cavalini Cavenago
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 12/06738-9 - Evaluation of materials, instruments and protocols of irrigation used in Endodontic treatment, by means of scanning electron microscopy and micro analysis of x-ray.
Grantee:Marco Antonio Hungaro Duarte
Support Opportunities: Regular Research Grants