ANALYSIS OF COLOR CHARACTERISTICS FOR VARIOUS COMBINATIONS OF THE CORE MATERIALS AND ALLCERAMIC MATERIALS

Abstract

This paper is devoted to the analysis of the optical interaction of materials for the fabrication of the post-core and all-ceramic framework of a non-removable prosthesis. The gold-palladium alloy, cobalt-chromium alloy and composite materials were chosen as the material for restoration of the core of teeth. The first group of ceramic samples consisted of zirconia zirconia disks (Dental Direkt, Germany), 0.3 mm thick and 0.5 mm thick with different transparency (high, medium and low). The second group of framed ceramic materials ware disks from lithium disilicate E.max Press (Ivoclar Vivadent, Liechtenstein), 0.4 mm thick and 0.6 mm thick from blanks of different transparency (high transparency, low transparency, medium opacity, high opacity). The study was based on the principle of comparative analysis of the obtained samples on a spectrometric color analyzer and comparing the reflection coefficient. The dependence of the brightness of the finished restoration on the type of the core materials and all-ceramic discs of different thicknesses has been determined, which should be taken into account when calculating the final ceramic restoration color. It has been established that a composite base should be used for prosthetics of an aesthetically significant group of teeth. In turn, core materials from CoCch and Au alloys according to colorimetric characteristics are not suitable for this prosthesis and they must be primed with opaque materials beforehand.