Effect of Different Temperatures on Flexural Cyclic Fatigue Resistance of 2Shape and OneShape Rotary Endodontic Instruments

Autor:	Shaimaa Ismail Gawdat, Marwa Bedier
Rok vydání:	2020
Předmět:	0209 industrial biotechnology Cyclic stress 020901 industrial engineering & automation Materials science Flexural strength Scanning electron microscope Endodontic files 02 engineering and technology Composite material 021001 nanoscience & nanotechnology 0210 nano-technology
Zdroj:	Egyptian Dental Journal. 66:355-364
ISSN:	2090-2360
DOI:	10.21608/edj.2020.79111
Popis:	Objectives: The aim of the present study was to evaluate the effect of the different temperatures on the flexural cyclic fatigue of 2 Shape and OneShape rotary endodontic files.Materials and Methods: Forty-rotary endodontic files were divided according to the type of instrument used and the surrounding temperature (n=10); 2Shape and OneShape rotary endodontic files rotated in a custom made simulated canal model block fixed to a beaker containing water with temperature adjusted to either 37 °C or 60 °C. Time was recorded from the beginning of rotation until the fracture was detected, then the number of cycles to failure (NCF) and the length of the fractured segment (FL) were evaluated. Two representative samples were photographed under scanning electron microscopy. Two-way Analysis of Variance (ANOVA) was used to study the effect of the type of instrument used and temperature on the number of cycles to failure and the length of the fractured segment. Results: 2Shape rotary endodontic files used at 37° C showed statistically significant highest mean of number of cycles to failure compared to 2Shape at 60°C (P
Databáze:	OpenAIRE
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