Resistência à fadiga cíclica de instrumentos de níquel titânio: PRO-R, RECIPROC, X1 BLUE FILE e RECIPROC BLUE

• Autor(a) principal: Sobral, Thais Kauana Magalhães
• Data de Publicação: 2021
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório do Centro Universitário Braz Cubas
• Texto Completo: https://repositorio.cruzeirodosul.edu.br/handle/123456789/4096
• topic: Odontologia; Endodontia; Fadiga; Instrumentos odontológicos; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The aim of this study was to evaluate the resistance to dynamic cyclic fatigue of reciprocating instruments X1 Blue File (25.06), Pro-R (25.08), Reciproc R25 (25.08) and Reciproc Blue R25 (25.08). A total of 48 instruments were used, divided into 4 groups (n=12) according to the tested system. The dynamic cyclic fatigue test was performed on a specially designed device that performed controlled axial movements. The instruments were activated with reciprocating movement in an ceramic artificial canal, with an angle of 60º, 5 mm of radius of curvature and an internal diameter of 1.5 mm. The artificial canal was kept submerged in water, simulating body temperature (37 ± 1 °C). The instruments were activated until fracture and the time until failure was recorded. The fractured fragments were measured on a digital caliper. To evaluate the time data, the One- Way ANOVA test was used for multi-comparison of samples and the Tukey test was used for two-to-two comparison. To analyze the fragment size data, the Kruskal-Wallis test was used for multi-comparison of samples and the Mann- Whitney test was used for two-by-two comparison. The level of significance was set at 5%. The Pro-R and Reciproc Blue instruments showed a longer time to fracture than the other instruments evaluated (p <0.05). The Reciproc instrument had a longer time to fracture than the X1 Blue File (p <0.05). Regarding the size of the fragments, there was a statistically significant difference between the Pro- R group and the other groups (p <0.05). The Reciproc and Reciproc Blue groups were statistically different from each other (p <0.05) but statistically similar to the X1 Blue File (p> 0.05). It can be concluded that the Pro-R and Reciproc Blue instruments were more resistant to cyclic fatigue than the Reciproc and X1 Blue File instruments.