Comparative strength of metal–ceramic and metal–composite bonds after extended thermocycling

Abstract

The relative strengths of ceramic-to-metal and composite-to-metal bonds were compared after prolonged thermocycling. A total of 104 cast discs were produced from a gold alloy (Pontor LFC). A ceramic material (Duceragold) was fused to 24 discs to assess the strength of the metal-ceramic bond. An indirect composite material (New Metacolor Infis) was bonded to the remaining discs after surface preparation by Rocatec tribochemical coating, tin plating and priming with a phosphate conditioner [10-methacryloyloxydecyl dihydrogen phosphate (MDP), Cesead II], priming with a thione conditioner (V-Primer) or no treatment (unprimed control). Shear bond strengths were determined before and after thermocycling at 20,000 and 100,000 cycles. Pre-thermocycling bond strengths were ranked in the order: metal-ceramic (40.5 MPa); Rocatec treatment (33.1 MPa) and tin plating-MDP (31.0 MPa); V-Primer (20.9 MPa); and control (11.9 MPa). The bond strengths of the first three groups were not significantly different after 20,000 thermocycles, whereas those of the V-Primer and control groups were significantly reduced. After extended thermocycling (100,000 cycles) the metal-ceramic group had the highest mean shear bond strength (28.5 MPa; P < 0.05), followed by the Rocatec (23.9 MPa) and tin plating-MDP (22.1 MPa) groups. The metal-ceramic bond was the most durable, although its strength was reduced by 29.6% after extended thermocycling. On the basis of these results, we recommend the Rocatec and tin plating-MDP systems for composite-to-metal bonding. Metal-ceramic bonding, however, is superior to metal-composite bonding within the limitation of the current experiment.

Evaluation of interface characterization and adhesion of glass ceramics to commercially pure titanium and gold alloy after thermal- and mechanical-loading

“…In this study, the dwelling time at each temperature was 10 s and the transfer time from one bath to the other was 5 s similar to that of Tróia et al [28]. In the study of Shimoe et al [38], the dwelling time was not mentioned.…”

“…The study of Tróia Jr. et al [28] investigated the same thermal variation and metallic substrate (cpTi) but did not find any influence of thermal cycling on adhesion of ceramic onto this metal. Probably, this factor would be more significant in more drastic conditions as those employed in the study of Shimoe et al [38] who performed extended thermal cycling (100.000 cycles) and observed a 30% reduction in mean bond strength. In this study, it was more concentrated on the combined effect of thermal and mechanical cycling thus extended thermal cycling was not performed.…”

Bonding durability between acrylic resin adhesives and titanium with surface preparations

“…The metoxy group of γ-MTPS reacts with alkoxy groups on surface of silica, and results in siloxane bonding (covalent bonding) 25) . Although ROC was reported to be efficient for bonding indirect composite resin materials and noble and/or base metals 26,27) , in this study, the bond strength obtained by the ROC treatment was lower as well as that obtained by SAN. Previous investigations indicated that ROC was not so effective in enhancing the bond strength between cobalt-chromium alloy or titanium and poly MMA denture base resin 16,17) and it was speculated that the ROC system may be suitable for unyielding specimens, such as ceramic or indirect composite materials, but not for poly(MMA) linear polymers, which exhibit a greater degree of polymerization shrinkage and thermal expansion.…”

Mechanical and Thermal Cycling Effects on the Flexural Strength of Glass Ceramics Fused to Titanium

“…However, it was found that thermal cycling did not exert any influence on adhesion of ceramic with this metal. Nonetheless, this factor became more significant and pronounced in more drastic conditions as those employed in the study of Shimoe et al 42) , where extended thermal cycling (100,000 cycles) was performed. As a result, a 30％ reduction in mean bond strength was observed.…”