Análise e avaliação por meio do MEV da geometria dos instrumentos protaper® universal mecanizados antes e após sua utilização no preparo de canais de molares

• Ano de defesa: 2011
• Autor(a) principal: Drago, Mariana Aleluia
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Clinica Odontológica; Centro de Ciências da Saúde; UFES; Programa de Pós-Graduação em Clínica Odontológica
• Palavras-chave em Português: Molar tooth; Pulp cavity; Endodontics; Dente molar; Cavidade pulpar; Dentes; Molares; Endodontia; Cavidade da polpa dentária; Odontologia; 616.314
• Link de acesso: http://repositorio.ufes.br/handle/10/8160

This study evaluated the type and location of defects on the surfaces of rotary instruments ProTaper® Universal before and after use in the preparation of root canals and compared possible shape changes resulting from its use files to prepare the canals with their original conformation. It was used 8 boxes of files of ProTaper® Universal containing: Sx, S1, S2, F1, F2, F3, F4 and F5 25mm long, divided into three groups. Group A before the use of the instruments. Group B afer the use of each set of the instruments to prepare three molars. Goup C instrumented with the same series, in two molars following the technique recommended by the manufacturer of instrumentation. Analyses were conducted in the following dimensional: length and angle of the tip, diameter and taper at various points along the rod and diameter D0; tilt angles of helices to the long axis of the instrument, the lengths of steps and length of the total helix. Furthermore, we evaluated the deformation of 3mm from the tip. Measurements were performed in a scanning electron microscope, according to the Specification ANSI/ADA n.101 (2001) in the three moments of the instrumentation in root canals. The values were analyzed by descriptive tests, Wilcoxon and t test. The result showed that the types of defects found in ProTaper instruments were marks and metal strips, sharp edges and blunt depressions. These defects were present on the surface of the files 3mm over the study. Before instrumentation in root canals, braking marks and strips of metal and sharp edges were more blunt observed in the first and third mm. After the instrumentation, the amount of files that had sharp edges and blunt depression progressed. There was a decrease in legth from the tip of the instrument ProTaper, as the angle increased at all times. The diameter remained within the limits of tolerance in some parts of the instrument shaft, along the experiment. The inclination angles of the propellers on some edges decreased, while the distance between the crests of successive helical stems increased at all the times. The length of the active part were below the recommended 16 mm and using inside the root canal, the values decreased. No instruments fractured during the experiment.