BACKGROUND: The aim of this study was to analyze the influence of rotaryinstruments' geometry and surface titanium-nitride (TiN) treatment on the fatigue fracture, through the comparison of cyclic fatigue resistance of two endodontic systems that have similar cross-sectional design and different surface coating.METHODS: 130 Mtwo (10/.04; 15/.05; 20/.06; 25/.06; 30/.05; 35/.04; 40/.04) andEasy Shape (15/.04; 20/.05; 25/.06; 30/.05; 35/.04; 40/.04) were tested for cyclic fatigue resistance. Time to fracture (TtF) was determined by counting the seconds of continuous rotation until final fracture in an artificial canal with60° angle and a 5 mm radius of curve. The fracture surface of each fragment wasexamined with a scanning electron microscope (SEM). Data were subjected toone-way analysis of variance (ANOVA) and Tukey post-hoc tests.RESULTS: Mtwo perform a significantly (P<0,001) higher NCF compared with EasyShape of the same size and taper. The comparison between Mtwo and Easy Shape instruments with the same taper showed higher TtF values of Mtwo files than the Easy Shape ones (P<0,001) while there were no differences among Mtwo and Easy Shape instruments with the same tip, (P>0,05).CONCLUSIONS: Mtwo exhibit a higher NCF thanks to the smaller metal volumecontained in their core. Titanium-nitride coating doesn't influence theperformance of Easy Shape instruments on static test of cyclic fatigue.

Cyclic fatigue comparison among endodontic instruments with similar cross section and different surface coating

PEDULLA', EUGENIO;
2020-01-01

Abstract

BACKGROUND: The aim of this study was to analyze the influence of rotaryinstruments' geometry and surface titanium-nitride (TiN) treatment on the fatigue fracture, through the comparison of cyclic fatigue resistance of two endodontic systems that have similar cross-sectional design and different surface coating.METHODS: 130 Mtwo (10/.04; 15/.05; 20/.06; 25/.06; 30/.05; 35/.04; 40/.04) andEasy Shape (15/.04; 20/.05; 25/.06; 30/.05; 35/.04; 40/.04) were tested for cyclic fatigue resistance. Time to fracture (TtF) was determined by counting the seconds of continuous rotation until final fracture in an artificial canal with60° angle and a 5 mm radius of curve. The fracture surface of each fragment wasexamined with a scanning electron microscope (SEM). Data were subjected toone-way analysis of variance (ANOVA) and Tukey post-hoc tests.RESULTS: Mtwo perform a significantly (P<0,001) higher NCF compared with EasyShape of the same size and taper. The comparison between Mtwo and Easy Shape instruments with the same taper showed higher TtF values of Mtwo files than the Easy Shape ones (P<0,001) while there were no differences among Mtwo and Easy Shape instruments with the same tip, (P>0,05).CONCLUSIONS: Mtwo exhibit a higher NCF thanks to the smaller metal volumecontained in their core. Titanium-nitride coating doesn't influence theperformance of Easy Shape instruments on static test of cyclic fatigue.
2020
Cyclic fatigue; Coating; Titanium-nitride
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/244139
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