Abstract: PURPOSE: To evaluate the bond strength of Vita OMEGA 900 low fusing porcelain fused with the goldplated Wirobond® cobalt-chrome metalt ceramic alloy. METHODS: Low fusing porcelain was fused with the cobalt-chromium alloy strips(group A) and the goldplated cobalt-chromium alloy strips(group B) respectively according to ISO9693 (A:8、B:10). 8 specimens of each group were submitted to three point bending test. Two more test pieces fused with gold plated cobalt-chromium alloys were made (group B’). One test piece of both group B and group B’ were observed under scanning electron microscope (SEM) randomly. The data was analyzed with SPSS 16.0 software package. RESULTS: The bond strength (MPa) of group A and group B was 29.92±4.28 and 28.20±5.21, respectively (P>0.05), both higher than 25 MPa required by ISO9693. SEM showed that Vita OMEGA 900 low fusing porcelain and the goldplated Wirobond® cobalt-chrome metalt ceramic alloy combined together closely without cracks. Much gold was fused to the cobalt-chrome alloy surface of breaking porcelain specimen after testing. CONCLUSIONS: Vita OMEGA 900 low fusing porcelain can match with the goldplated Wirobond® cobalt-chrome metalt ceramic alloy.

Key words: Goldplated, Cobalt-chromium, Low fusing porcelain