Influência da modificação do desenho de fresas coletoras retas na variação de temperatura durante a perfuração de osso sintético

• Ano de defesa: 2018
• Autor(a) principal: Simões, Marinês Rigo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Positivo; Brasil; Pós-Graduação; Programa de Pós-Graduação em Odontologia Clínica; UP
• Palavras-chave em Português: Odontologia; Implantação dentária; Técnicas in vitro; Temperatura alta; Osseointegração; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: https://repositorio.cruzeirodosul.edu.br/handle/123456789/2075

Among the factors that lead to the loss of dental implants are those related to surgical trauma. During drilling and implant installation there may be a local warm up. Heat-induced tissue necrosis impairs bone healing and osseointegration. The objective of this work is to evaluate the heat generation during the perforation in artificial bone type I, using dental implant drills with a modified design. Seven new drills of varying diameters were compared with conventional drills available on the market, from the measurement of heat changes by thermocouple. A block of polyurethane as test body was used, as type I bone simulator. The perforations were performed at 780 rpm and torque of 55 N.cm, without lubrication and at constant loading speed of 2 kg, to the depth of 13 mm, with surgical equipment coupled in a device attached to universal testing machine. The thermocouple was installed 2.0 mm from the external radius of each drill. The temperatures were collected at the end of the drilling (Tp) and at the time of removal of the milling cutter (Tr). The obtained particles of each perforation were measured in precision scale (M, mass, in grams). The data collected regarding the Variation of Drilling Temperature (Tp, ° C), Removal Temperature Variation (Tr, ° C) and Mass (g) were recorded in a Microsoft Word Excel® tab sheet, submitted to the Shapiro-Wilk, followed by the Kruskal-Wallis or Tukey test, with p <0.05. In the results the test cutters presented similar performance to the control cutters. The Tp did not present a significant statistical difference, whereas the Tr showed a significantly smaller difference in the diameters of 2.0 and 3.0 mm. The mass also did not present a significant statistical difference. The reduction of the contact area of the cutter showed a lower temperature variation demonstrating a trend, however, complementary studies should be performed so that it can be considered a choice of choice for surgeons.