The impact of clinical use on the torsional behavior of Reciproc and WaveOne instruments

The impact of clinical use on the torsional behavior of Reciproc and WaveOne instruments

The aim of this study was to assess the influence of clinical use, in vivo, on the torsional behavior of Reciproc and WaveOne instruments considering the possibility that they degraded with use. Diameter at each millimeter, pitch length, and area at 3 mm from the tip were determined for both types o...

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Bibliographic Details
Published in:Journal of applied oral science Vol. 24; no. 4; pp. 310 - 316
Main Authors: Magalhães, Rafael Rodrigues Soares de, Braga, Lígia Carolina Moreira, Pereira, Érika Sales Joviano, Peixoto, Isabella Faria da Cunha, Buono, Vicente Tadeu Lopes, Bahia, Maria Guiomar de Azevedo
Format: Journal Article
Language:English
Published: Brazil Faculdade De Odontologia De Bauru - USP 01-07-2016
University of São Paulo
Subjects:
Dental Instruments
Dentistry
DENTISTRY, ORAL SURGERY & MEDICINE
Endodontics
Equipment Design
Equipment Failure
Instrumentation
Materials Testing
Microscopy, Electron, Scanning
Nickel
Original
Reference Values
Root canal preparation
Root Canal Preparation - instrumentation
Rotation
Stress, Mechanical
Surface Properties
Titanium
Torque
Torsion, Mechanical
Instrumentation
Endodontics
Root canal preparation
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Summary:The aim of this study was to assess the influence of clinical use, in vivo, on the torsional behavior of Reciproc and WaveOne instruments considering the possibility that they degraded with use. Diameter at each millimeter, pitch length, and area at 3 mm from the tip were determined for both types of instruments. Twenty-four instruments, size 25, 0.08 taper, of each system were divided into two groups (n=12 each): Control Group (CG), in which new Reciproc (RC) and WaveOne Primary (WO) instruments were tested in torsion until rupture based on ISO 3630-1; and Experimental Group (EG), in which each new instrument was clinically used to clean and shape the root canals of one molar. After clinical use, the instruments were analyzed using optical and scanning electron microscopy and subsequently tested in torsion until fracture. Data were analyzed using one-way analysis of variance at a=.05. WO instruments showed significantly higher mean values of cross-sectional area A3 (P=0.000) and smaller pitch lengths than RC instruments with no statistically significant differences in the diameter at D3 (P=0.521). No significant differences in torsional resistance between the RC and WO new instruments (P=0.134) were found. The clinical use resulted in a tendency of reduction in the maximum torque of the analyzed instruments but no statistically significant difference was observed between them (P=0.327). During the preparation of the root canals, two fractured RC instruments and longitudinal and transversal cracks in RC and WO instruments were observed through SEM analysis. After clinical use, no statistically significant reduction in the torsional resistance was observed.
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ISSN:1678-7757
1678-7765
1678-7765
1678-7757
DOI:10.1590/1678-775720150596