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KMID : 1035320150420040345
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Korean Society for Dental Materials
2015 Volume.42 No. 4 p.345 ~ p.352
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Effect of softening-heat treatment on hardness change of an Au-Pd-Zn-In-Sn metal-ceramic alloy during porcelain firing simulation
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Shin Hye-Jung
Yu Young-Jun
Kwon Yong-Hoon
Kim Hyung-Il
Seol Hyo-Joung
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Abstract
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The effect of softening-heat treatment on hardness change of an Au-Pd-Zn-In-Sn metal-ceramic alloy during porcelain firing simulation was examined. The metal-ceramic alloy was softened enough to improve the work efficiency for fit adjustments of the prosthesis before firing porcelain by solution-treatment at 980℃ for 10 min. The softening effect by solution-treatment disappeared at degassing stage. The final hardness of the solution-treated specimen was higher than that of the firing simulated specimen without solution-treatment. The α₂ phase precipitation in the solution-treated and then firing simulated specimen improved the hardness of specimen, and the α₂ phase was composed of the Au-Pd-Zn phase with an AuCu-type face-centered tetragonal structure. Therefore, the work efficiency and durability of the final prosthesis can be improved by softening-heat treatment before porcelain firing.
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KEYWORD
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Au-Pd-Zn-In-Sn metal-ceramic alloy, solution-treatment, precipitation hardening, porcelain firing simulation
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