Abstract
Holographic interferometric technique by a general double-exposure method has been used to measure the deformation of many kinds of things. A specific optical system as a kind of application of this technique is devised to measure only vertical deformation of dental impression materials. The results of the measurement of the time dependence of one directional deformation during or after the vulcanization of four kinds of elastomer impression materials are shown. These results show clearly that this technique is very useful for the analysis of deformation of dental impression materials.
