Bond strength of binary titanium alloys to porcelain

The purpose of this study was to investigate the bond strength between porc elain and experimental cast titanium alloys. Eleven binary titanium alloys were examined: Ti-Cr (15, 20, 25 wt %), Ti-Pd (15, 20, 25 wt%), Ti-Ag (10, 15. 20 wt%), and Ti-Cu (5, 10 wt%). As controls, the bond strengths For com mercially pure titanium (KS-50, Kobelco, Japan) and a high noble gold alloy (KIK, Ishifuku, Japan) were also examined. Castings were made using a cent rifugal casting unit (Ticast Super R. Selec Co., Japan). Commercial porcela in for titanium (TITAN, Noritake, Japan) was applied to cast specimens. The bond strengths were evaluated using a three-point bend test according to I SO 9693. Since the elastic modulus value is needed to evaluate the bond str ength, the modulus was measured for each alloy using a three-point bend tes t. Results were analyzed using one-way ANOVA/S-N-K test (alpha = 0.05). Alt hough the elastic moduli of the Ti-Pd alloys were significantly lower than those of other alloys (p = 0.0001), there was a significant difference in b ond strength only between the Ti-25Pd and Ti-15Ag alloys (p = 0.009). The s trengths determined for all the experimental alloys ranged from 29.4 to 37. 2 MPa, which are above the minimum value required by the ISO specification (25 MPa). (C) 2001 Elsevier Science Ltd. All rights reserved.