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Aust Endod J. 2019 Sep 27. doi: 10.1111/aej.12374. [Epub ahead of print]

Resistance to cyclic fatigue of reciprocating instruments determined at body temperature and phase transformation analysis.

Scott R¹, Arias A^1,2, Macorra JC², Govindjee S³, Peters OA^1,4.

Author information

1

Department of Endodontics, University of the Pacific, Arthur A. Dugoni School of Dentistry, San Francisco, California, USA.

2

Department of Conservative Dentistry and Prothesis, School of Dentistry, Complutense University, Madrid, Spain.

3

Department of Civil and Environmental Engineering, University of California, Berkeley, California, USA.

4

Oral Health Centre, University of Queensland, Herston, Queensland, Australia.

Abstract

The purpose of this study was to compare cyclic fatigue (CF) resistance of reciprocating instruments at body temperature and relate the findings to their martensitic transformation temperatures. Contemporary nickel-titanium (NiTi) reciprocating instruments WaveOne Primary, WaveOne Gold Primary and EdgeFile X1 (n = 20 each and #25 tip diameter) were tested for CF resistance at body temperature (37 ± 1°C). Instruments were actioned according to manufacturer guidelines until fracture occurred in a simulated canal (angle of curvature = 60°, radius of curvature = 3 mm and centre of curvature = 5 mm from the tip). Time to fracture was recorded, and data analysed using Weibull analysis. Two instruments of each were tested using differential scanning calorimetry (DSC) to assess phase transformation temperatures. Reciprocating instruments manufactured with new alloys seem to be safer to CF than those manufactured with traditional M-Wire at body temperature. Martensitic transformation temperatures seem not to relate with fatigue behaviour for reciprocating motions.

 

Aust Endod J. 2019 Aug 13. doi: 10.1111/aej.12369. [Epub ahead of print]

Effect of two different temperatures on resistance to cyclic fatigue of one Curve, EdgeFile, HyFlex CM and ProTaper next files.

Topçuoğlu HS¹, Topçuoğlu G², Kafdağ Ö¹, Balkaya H³.

Author information

1

Department of Endodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey.

2

Dentalpark oral health center, Private practice in pedodontics, Kayseri, Turkey.

3

Department of Restorative Dentistry, Faculty of Dentistry, Erciyes University, Kayseri, Turkey.

Abstract

This study compared the cyclic fatigue resistance (CFR) of three controlled memory (CM) nickel-titanium rotary files (One Curve, EdgeFile and HyFlex CM) in comparison with a file (ProTaper Next) made from M-wire nickel-titanium alloy at two different temperatures (room and intracanal) in an s-shaped canal. one hundred and sixty files were tested to determine the CFR of oneCurve, EdgeFile, HyFlex CM and ProTaper Next in an artificial canal at room and at intracanal temperature. The number of cycles to failure was recorded, and data were analysed. At both temperatures, ProTaper Next exhibited the lowest CFR compared with the other files (P < 0.05). At room temperature, there was no difference among the three CM files regarding CFR (P > 0.05). At intracanal temperature, oneCurve and EdgeFile exhibited more CFR than the HyFlex CM (P < 0.05). Testing at intracanal temperature caused a significant decrease in CFR of all tested files compared with testing at room temperature.

 

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