Evaluation of the polymerization shrinkage of different resin cements under the zirconia crowns, using stereomicroscope and Scanning electron microscope

Abstract

The goal of this in vitro investigation was to assess the microleakage caused by polymerization shrinkage of four different resin cements, which were used for cementation of monolithic zirconia crown on prepared maxillary and mandibular first premolar extracted for orthodontic purpose. The microleakage was analysed by dye staining, followed by evaluation via optical method using stereomicroscope and scanning electron microscope. Following statistical analysis of the results, it was discovered that all of the tested luting cements exhibit a sizable degree of polymerization shrinkage. The depth of dye penetration also showed high degree of correlation with polymerization shrinkage. However, the magnitude of correlation varied among the different groups.