Abstract
Thermal expansion was examined for commercial porcelains and refractory die materials systematized for laminate veneer restoration (Cosmotech, Clapearl and Lamina systems). The expansion curves of all the porcelains were almost the same as that of the conventional porcelain for ceramo-metal restoration, having a peak around 700℃. The expansion of the refractory die material, on the other hand, reached plateau around 600℃. The curve before plateau was similar to that of the porcelain in Cosmotech and Lamina systems, while Clapearl system showed considerably larger expansion of the die material than the porcelain over 300℃ and its maximum value was much larger than those of the former two systems. Thus marked discrepancy was found between the maximum expansion of the die material over 600℃ and the rapid contraction of the porcelain over 700℃ in each system, which may cause adverse effects on the fired laminate veneer.
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