EVALUATION OF CYCLIC FATIGUE, TORSIONAL RESISTANCE AND ANGLE DEFLECTION OF A NEW ENDODONTIC INSTRUMENT

CHARLES ANDRÉ DALL AGNOL JÚNIOR, GIOVANA SIOCHETA DA SILVA, GABRIEL BARCELOS SÓ, MURILO PRIORI ALCALDE, MARCO ANTÔNIO HÚNGARO DUARTE, MARCUS VINÍCIUS REIS SÓ, RICARDO ABREU DA ROSA

Abstract


The aim of this study was to evaluate the cyclic fatigue and torsional resistance, and angular deflection of a new nickel-titanium (NiTi) instrument. Sixty instruments were selected: ProDesign Logic2 25.03 (n=20) and 25.05 (n=20) (Easy Equipamentos Odontológico, Belo Horizonte, Brazil) and Flat File 25.04 (n=20) (MK Life, Porto Alegre, Brazil). For the cyclic fatigue test, instruments were introduced into an artificial stainless-steel canal with a 60° angle and 5mm curvature radius located 5mm from the instruments tip. Cyclic fatigue test was performed at controlled room temperature (37o ± 1oC). Time to fracture was recorded and calculated. Torque and angle of rotation at failure were measured according to ISO 3630-1, in which the 3mm tip of each instrument was fixed and connected to a motor, a processor and a load cell. Torque (N/cm) to instrument fracture was measured and angular deflection at failure was recorded (in degrees). Statistical analysis was performed using one-way ANOVA and Tukey post hoc tests. Flat File 25.04 instruments had a lower cyclic fatigue resistance than Logic 25.03 and 25.05 instruments (P < 0.05). Flat File 25.04 and Logic2 25.05 presented similar torque to fracture (P < 0.05) and both were more torque resistant than Logic2 25.03 (P < 0.05). Angular deflection was different for all tested instruments (P < 0.05), as follows: Logic2 25.03, Logic2 25.05 and Flat File 25.04. Mechanical properties of the evaluated instruments depended on their geometric features and thermal treatment of the NiTi alloy.


Keywords


Endodontics; Mechanical tests; Nickel-titanium instruments

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DOI: http://dx.doi.org/10.19177/jrd.v9e62021%25p

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Journal of Research in Dentistry, University of Southern of Santa Catarina, Santa Catarina, ISSN 2317-5907

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