Abstract
Multi-purpose gold alloys (Degunorm, Degudent LTG) were investigated as casting metal for conical double-crown telescopic prosthesis. Bond strength between porcelain and metal was compared to conventional ceramo-metal system. In addition, bond strength with some four treatments was also examined. The results were as follows:1. Bond strength of multi-purpose gold alloy with its original low-fused porcelain was similar to those of conventional dental porcelain-fused metal.2. Bond strength of Degunorm painted bonding agent after sandblasting showed the highest value under all test conditions in this study.3. According to SEM observation, body-opaque interface after firing was definite. However, bondingopaque interface was not distinguishable.4. The values of Vickers hardness (Hv) for body, opaque and bonding porcelain were 712, 325 and 468respectively.5. Particle size of opaque porcelain was approximately 50 pm, and was coarser than that of bonding porcelain.6. Leucite was detected in all of porcelain powders before firing. However, the leucite peak of body powder drawn in the X-ray diffraction chart was not obviously steep because it was amorphous.
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