抄録
Recently a new type dental porcelain furnace built in infra-red rays heating elements named “Technomat” was developed. It has many advantages because porcelain fusing begins from metal-ceramics interface not from the outer surface of porcelain. The purpose of this study is to compare the bond strength, surface roughness and edge form of porcelain between conventional type furnace and “Technomat”.
And we obtained the following results.
1. Push shear bond strength of Ni-Cr alloy named “Uni-metal” by using “Technomat” were 70% greater than that of conventional type. But by Pd alloy “Aurora” and Au alloy “Uni -gold” bond strength showed no significant difference.
2. By measuring surface roughness and edge form of porcelain, “Technomat” showed underglazing tendency than the conventional type at the same firing temperature.
3. Xray element analyses showed no significant difference between two furnaces. Additional tests must be made by using other Ni-Cr alloys.
