Effect of temperature on the cyclic fatigue resistance of thermally treated reciprocating instruments

Objectives The aim of this study was to evaluate the impact of body temperature on the cyclic fatigue resistance of different NiTi alloys used for the manufacturing of Reciproc Blue R25 (RB 25.08; VDW, Munich, Germany), X1 Blue File 25 (X1 25.06; MK Life Medical and Dental Products, Porto Alegre, Br...

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Bibliographic Details
Published in:Clinical oral investigations 2019-07, Vol.23 (7), p.3047-3052
Main Authors: Klymus, Michel Espinosa, Alcalde, Murilo Priori, Vivan, Rodrigo Ricci, Só, Marcus Vinicius Reis, de Vasconselos, Bruno Carvalho, Duarte, Marco Antonio Hungaro
Format: Article
Language:English
Subjects:
Body temperature
Dental Alloys
Dental equipment
Dental Instruments
Dentistry
Endodontics
Equipment Design
Equipment Failure
Materials fatigue
Materials Testing
Mechanical properties
Medicine
Nickel
Original Article
Root Canal Preparation
Root canals
Stainless steel
Stress, Mechanical
Temperature
Temperature effects
Titanium
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Summary:Objectives The aim of this study was to evaluate the impact of body temperature on the cyclic fatigue resistance of different NiTi alloys used for the manufacturing of Reciproc Blue R25 (RB 25.08; VDW, Munich, Germany), X1 Blue File 25 (X1 25.06; MK Life Medical and Dental Products, Porto Alegre, Brazil) and WaveOne Gold Primary (WOG 25.07; Dentsply Maillefer, Ballaigues, Switzerland). Materials and methods Sixty instruments of the RB 25.08, X1 25.06 and WOG 25.07 systems were used ( n  = 20). Cyclic fatigue tests were performed at room temperature (20° ± 1 °C) and at body temperature (37° ± 1 °C). The instruments were reciprocated until fracture occurred in an artificial stainless steel canal with a 60° angle and a 5-mm radius of curvature. The time to fracture (TTF) was recorded. Also, the number of cycles to fracture (NCF) was calculated. Data were analysed using one-way ANOVA and Tukey’s tests for inter-group comparison at both temperatures and for the reduction of cyclic fatigue at body temperature. For intra-group comparison at the different temperatures, the unpaired t test was used. Results The cyclic fatigue test at 20 °C showed that RB 25.08 and X1 25.06 presented significantly higher TTF and NCF than WOG 25.07 ( P  
ISSN:1432-6981
1436-3771
DOI:10.1007/s00784-018-2718-1