The impact of clinical use on the torsional behavior of Reciproc and WaveOne instruments
| Autor: | Rafael Rodrigues Soares de Magalhães, Isabella Faria da Cunha Peixoto, Lígia Carolina Moreira Braga, Vicente Tadeu Lopes Buono, Maria Guiomar de Azevedo Bahia, Érika Sales Joviano Pereira |
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| Rok vydání: | 2016 |
| Předmět: |
Molar
Dental Instruments Materials science Rotation Surface Properties 0206 medical engineering Torsion Mechanical 02 engineering and technology Endodontics 03 medical and health sciences 0302 clinical medicine Nickel Reference Values Materials Testing Forensic engineering Pitch length Instrumentation General Dentistry Titanium Orthodontics Significant difference Root canal preparation Torsion (mechanics) Sem analysis Original Articles Equipment Design 030206 dentistry 020601 biomedical engineering Dental instruments lcsh:RK1-715 Torque lcsh:Dentistry Reference values Microscopy Electron Scanning Equipment Failure Stress Mechanical Maximum torque |
| Zdroj: | Journal of Applied Oral Science v.24 n.4 2016 Journal of applied oral science Universidade de São Paulo (USP) instacron:USP Journal of Applied Oral Science, Vol 24, Iss 4, Pp 310-316 Journal of Applied Oral Science, Volume: 24, Issue: 4, Pages: 310-316, Published: AUG 2016 Journal of Applied Oral Science |
| ISSN: | 1678-7757 |
| Popis: | Torsional overload is a fracture representative parameter for instruments in single-file techniques. Objective 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. Material and Methods 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. Results 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. Conclusion After clinical use, no statistically significant reduction in the torsional resistance was observed. |
| Databáze: | OpenAIRE |
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