ANALYSIS OF THE STRESS-STRAIN STATE OF BONE TISSUE IN ORTHOPEDIC TREATMENT WITH BRIDGES BASED ON DENTAL IMPLANTS

Abstract

Currently, structures based on dental implants are increasingly used for orthopedic treatment of partial and complete tooth loss, which can significantly improve the effectiveness of treatment and the quality of life of patients. To date, a large number of implantation systems are known, which are quite well studied, but so far, a number of issues remain unresolved, and the most important of them is the choice of the method of fixation of implantation prostheses. The main task in orthopedic treatment based on dental implants is to maintain a stable level of bone tissue, and, as a result, the long-term prospects for the functioning of the implant and the entire structure. There are two main types of fixations of such prostheses: screw and cement, but there is still no specificity in the choice of indications for them. In this study, based on mathematical modeling data, an analysis of the stress-strain state of bone tissue in the area of implants installed at different angles to each other was carried out. Mathematical models of screw-fixed bridges supported by two implants located strictly parallel to each other and at angles from 2о to 10о have been developed (conical and planar types of connection of implant platforms with abutments have been studied). The analysis of the maximum equivalent Mises stresses occurring inside the structure itself is also carried out. Stress localization zones under vertical load have been identified. The critical angles of implant divergence have been determined, which determine the indications for the use of screw-type fixation of bridges.