Comparison of the bond strength of ceramics fused to titanium and Ni-Cr alloy

Park, Sae Young; Jeon, Young Chan; Jeong, Chang Mo

Abstract

Titanium requires special ceramic system for veneering. Low fusing dental ceramics with coefficients of thermal expansion matching that of titanium have been developed. The purpose of this study was to determine the bond strengths between cast and noncast pure titanium and two commercial titanium porcelains, and to compare the results with a conventional nickel-chromium alloyceramic system. The bond strengths were determined using a 3-point flexure test. Three-point flexure specimens 25x3x0.5mm were prepared. After removal of alpha-case layer, they were veneered with 8x3x1mm of ceramics at the center of the bar. Specimens were tested in a universal testing machine. Within the limits of this study, the following conclusions were drawn: 1. The bond strengths between pure titanium and two commercial porcelains exceeded th lower limit of the bonding strength value in ISO 9693(25MPa). 2. There was no significant difference between cast and noncast titanium-porcelain bonds. 3. There was no significant difference between two commercial titanium porcelains. 4. The bond strengths of the titanium-porcelain systems ranged from 73% to 79% of that of the Ni-Cr-conventional porcelain system.