Torsional Fatigue Resistance of Blue-treated Reciprocating Instruments
| Autor: | Gustavo De-Deus, Carlos N. Elias, Henrique dos Santos Antunes, Emmanuel João Nogueira Leal Silva, Victor Talarico Leal Vieira, Fernanda Hecksher |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Orthodontics Angle of rotation Materials science Torsional strength Torsion Mechanical Torsion (mechanics) 030206 dentistry Load cell Equipment Failure Analysis 03 medical and health sciences Reciprocating motion Fatigue resistance 030104 developmental biology 0302 clinical medicine Alloys Microscopy Electron Scanning Humans Equipment Failure General Dentistry Root Canal Preparation |
| Zdroj: | Journal of Endodontics. 44:1038-1041 |
| ISSN: | 0099-2399 |
| DOI: | 10.1016/j.joen.2018.03.005 |
| Popis: | The aim of the present study was to evaluate the influence of blue thermal treatment on the torsional resistance behavior of M-Wire Reciproc files (VDW, Munich, Germany).Ten M-Wire Reciproc R25 (25/0.08v) and 10 Reciproc Blue R25 (25/0.08v, VDW) instruments were used. The torque and angle of rotation at failure of new instruments (n = 10) were measured according to ISO 3630-1. Three millimeters of each instrument tip was clamped to a small load cell by a lever arm linked to the torsion axis. The fracture surface of all fragments was examined with a scanning electron microscope. Results were statistically analyzed using the Student t test at a significance level of P .05.The maximum torsional strength of M-Wire Reciproc was higher than Reciproc Blue instruments (P .05). Reciproc Blue instruments showed significantly higher angular rotation to fracture than M-Wire Reciproc instruments (P .05). Scanning electron microscopy of the fracture surface showed similar and typical features of torsional failure for the 2 types of instruments, including concentric abrasion marks and the fibrous dimple marks at the center of rotation.Reciproc Blue instruments showed a higher angle of rotation to fracture but a lower torque to failure than M-Wire Reciproc instruments. |
| Databáze: | OpenAIRE |
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