Influência da Ciclagem Térmica e Diferente Tipos de Solda na Resistência da Interface Metalo-Cerâmica

Abstract

Among these ones, 20 bars formed the control group (CG) and 40 were divided: 20 were attached by the use of brazing (BG) and 20 were laser welded (LG). A 1,0mm ceramic layer (0,1mm of opaque ceramics and 0,9mm of dentine ceramics) was applied over the bars, on its central and bottom area. The total area tested had 20mm 2 , with central load. The metal surfaces treatments, the temperature, and the times of ceramics coccion were recommended by the manufacturers. Half of the specimens were thermocycled (CGT, BGT, LGT). All the specimens underwent the three-point bending test with a 10-kilo load cell and speed of 1,5±0,5mm/min in an universal testing machine and the maximum load up to initial failure was marked. Data underwent statistical analysis (ANOVA and Tukey Test). There was no relevant static difference concerning the maximum load to metal-ceramic failure of the groups BG (10,55±1,37N) and LG (9,87±1,22N), but CG had the highest load up to failure (14,5±2,11N), statistically relevant, of all the groups, with p=0,001. When it comes to thermocycling, there were no relevant differences statistically, among all the studied groups. After the test, one specimen of each one of the groups was observed by MEV associated to EDX.