Abstract
To clarify the thermal properties of a laminated structure during the restoration of a crown, specific thermal capacity and thermal diffusivity of laminated specimens compose of casting gold-silver-palladium alloy, porcelain and luting glass ionomer cements having each different thermal conductivity were measured by the Xenon-flash method.
From these experimental values, thermal conductivity were calculated and evaluated in comparison with each other. As a result, it was proven that when the specimen is composed of a laminated structure with different thermal properties, the value of thermal diffusivity was the most varied of all thermal properties. The larger the differences of both thermal diffusivity and conductivity became, the more changeable thermal properties became. A tendency for tehrmal conductivity to increase was noted in a laminated specimen in which thermal conductivity of input side was smaller than that of the output side compared to specimens with a reverse laminated structure.
