Elimination, via high-rate laser dilatometry, of structural relaxation during thermal expansion measurement of dental porcelains

摘要

Objectives: Thermal expansion measurement of glassy materials is complicated by thermal history effects. Excess voume-trapped in quenched dental porcelains after firing-collapses via structural relaxation on first slow heating during conventional dilatometry, making the thermal expansion coefficient (α) obtained on first heating unrelable. The purpose of this study was to determine whether porcelain thermal expansion measurement at high thermal rates could minimize the influence of thermal history