ADHESION AND COMPARATIVE ASSESSMENT OF “MERON” AND “TOTAL-CEM” CEMENTS TO DENTIN, KHS ALLOY AND ZIRCONIUM DIOXIDE

Abstract

The aim of the study. Comparative evaluation of glass ionomer cements «Meron», «Total-Cem» to dentin, KHS alloy and zirconium dioxide. In order to improve the adhesion of the material to the tissues of the tooth, special attention is paid to adhesive fixation systems, which improve the fixation of prostheses not only with enamel, metal oxides, but also with dentine. Glass ionomer cement «Meron» has better adhesion to KHS alloy, glass ionomer cement «Total-Cem» to zirconium dioxide. Glass ionomer cement «Meron» contains polyacrylic acid, fluorosilicate and parabens. Parabens are esters of parahydroxybenzoic acid. «Total- Cem» is a self-etching self-adhesive composite cement for permanent fixation of double hardening. Does not require pre-etching before use, as well as the use of an adhesive composite – all included in a single application step Research materials and methods. Experimental studies were carried out on samples obtained by extraction of single-canal teeth. Pins made of KHS alloy and zirconium dioxide were fixed in the root canals with the help of Meron and Total-Cem fixing cements. Scientific novelty. The connection of glass ionomer with enamel is higher than with dentine, which can probably be explained by the higher content of calcium ions in enamel. But in our case, experience has shown that even such a connection is enough for the successful restoration of erosive lesions of the hard tissues of the teeth and their defects such as class V cavities. High adhesion values can be associated only with electronic exchange at the interface and the formation of donor-acceptor or covalent bonds of Meron cement with metal oxides, which are part of KHS. Conclusions. Adhesion of glass ionomer cements with various metals and alloys is determined by the physical and chemical properties of the oxide layer formed on the surface of the metals. In particular, the higher the electrical conductivity of the oxide layer and the greater the concentration of the main Lewis centers in it, the higher the adhesion of SIC to metals. The bond strength with enamel is always higher than with dentin due to the higher content of inorganic substances and higher homogeneity.