Análise comparativa da resistência à compressão na área de solda de duas ligas metálicas alternativas

Abstract

The functional life of a fixed partial prosthesis is dependent upon many biomechanical factors, including solder joints. A weak solder joint can drastically reduce the longevity of a complex prosthesis.The purpose of this research was to analyze the strength of the solder joint of two different based alloy, Tilite (Ni-Cr-Ti) and Verabond II (Ni-Cr), with the Verabond II took as the control group. 40 samples were cast, were ten out of these with Verabond II and the others 30 with the Tilite based alloy. The Tilite group was subdivided in three groups with ten samples each, and they received three different solder techniques (Vera Solder, Tilite own solder and laser solder). After they have been soldered, they were submitted to a compression machine and loaded till the fracture occurred. The data base were submitted to statistical analysis with the Kruskal-Wallis test, significant difference were found among the groups (H=7,92; p=0,048). With the Dunn test, it founded statistical difference only between the Verabond II soldered with the Vera Solder and the Tilite soldered with the Vera Solder. Based on the statistical results it could be concluded that the based alloy Tilite has similar strength at the solder joint as the Verabond II based alloy when it was soldered either way; Tilite own solder or laser solder. Additional study should be taken to verify this situation.