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SILVA, J. Evaluation of the flexural strength among different welding methods: Brazing TIG Laser. 2007. 109p. Dissertation, University of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto. The welding technique presents advantage of union of metallic parts that improves the adaptation and appropriate distribution of the bite forces, minimizing flaws in the dental prostheses. The objective was to evaluate the flexural strength in different welding methods: Brazing; Laser (Welder Desktop Dentaurum, Germany) and Tungsten inert gas TIG (Welder NTY Kernit, Brazil), comparing to a control group (non-welded). The cylindrical specimens were obtained from prefabricated wax conduits with 3mm of diameter and 30mm of length, melted in Ni-Cr alloys and split up transversally, forming the groups T1 and L1. After of the section the groups L and T received slices in 45° for fulfill, forming the groups (L2 and T2). The extremities were united with acrylic resin obeying a predetermined distance, from 0,3 mm to the brazing group, 0,1 mm to the TIG group, and in the laser group there wasn’t any space between the extremities of jointing. The specimes were included and welding in agreement with the proposition, turned and conducted to the flexion test. The data were submitted to the statistical test (ANOVA and Student–Newman-Keuls p<0,05) for multiple comparisons. According to the results (MPa) the control group (1796,55) obtained the largest average value, followed by the brazing group (1370,56), being the group T1(990,84) with the smallest value. In terms of statistics there was no difference between the groups with welding, existing only difference among the tested groups for the control group. However, we can affirm that the completion seems to influence the results of the resistance flexural discreetly in the TIG group. It can be concluded that the TIG method produces similar result to the laser and the brazing, what is clinical and important operationally. Word-key: Welding; Dental prostheses; Tungsten inert gas; Laser; Brazing.

Avaliação da resistência flexural entre diferentes métodos de soldagem: chama direta - TIG - Laser