Influência da conicidade no comportamento mecânico de instrumentos de níquel-titânio

• Autor(a) principal: Prado, Marco Aurélio Rodrigues do
• Data de Publicação: 2008
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/13995
• topic: Endodontic instruments; Nickel-titanium; Instruments flexibility; Instruments fracture; Instrumentos endodônticos; Níquel-titânio; Flexibilidade de instrumentos; Fratura de instrumentos; Instrumentos e aparelhos odontológicos; Ligas de níquel-titânio (Endodontia); Mecânica da fratura; Resistência de materiais; Elasticidade (Mecânica); CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA::ENDODONTIA

This work has as purpose to evaluate the influence of motor driven nickel-titanium instruments tapering, in the flexibility, resistance to fracture by twisting to the right by rotating flexure, analyzing also by means of scanning electronic microscopy the instruments fracture surface arising by twisting and rotating flexure, as well as the configuration of helices of helical cutting rods of instruments near the fracture point. Sixty instrument made of nickel- -titanium and motor-driven of K3® brand were used (Sybron Dental Specialties-Kerr, Mexico), nominal value of 25mm long, and 0,25mm diameter in Do, in tapering of 0,02 0,04 and 0,06mm/mm. Ten endodontic instruments of each tapering were evaluated by means of the non destructive test of flexure in cantilever and ten endodontic instruments of each tapering were evaluated by means of destructive tests twisting to the right and rotating flexure. After the performance of statistic test,: variance analysis at significance level of 5%, and multiple comparison test from Student-Newman-Keuls to 5%, Taking into consideration the implemented methodology, the applied statistical techniques (e.g. variance analysis at significance level of .05 and multiple comparison test from Student-Newman-Keuls at significance level of .05), and the obtained results, it was demonstrated that the flexibility of the instruments tested decreases as the tapering of the helices of helical cutting rods increases. The maximum twisting angle of the instruments tested by twisting decreases as the tapering of the helices of helical cutting rods increases. The maximum torque up to the fracture of the tested instruments increased as the tapering of the helices of helical cutting rods increased. The number of cycles for the fracture in rotating flexure decreases as the tapering increase and the increase of the resistance in flexure (flexibility decrease) of the tested endodontic instruments increased. The analysis by scanning electronic microscopy revealed that, independently of the tapering and the rotating type (twisting or rotating flexure) applied to the endodontic instrument, the fractured samples presented fractured surface of ductile characteristics. A reversion of the helical cutting rods course was observed on the twisting test near the immobilization point. A reversion of the helical cutting rods course (visible plastic deformation) on the rotating flexure test of the fractured instruments was not observed.