CALCULATION OF DEFORMATIONS AND EVALUATION OF STATIC STRENGTH OF STRUCTURAL ELEMENTS OF IMPLANT SYSTEMS ON THE EXAMPLE OF DENTAL IMPLANTS LIKO-M 4×10 OF DIFFERENT DESIGN

Abstract

Introduction. The creation of effective, reliable, safe, technologically advanced and competitive products is the main task of medical device engineering. The most important requirement to modern medical devices is to guarantee patients' safety during their lifetime. Today the use of modern computer-aided engineering analysis packages is the most effective calculation method for evaluating the strength and reliability of unique medical devices that can lead to serious consequences if their operation is disturbed. One of the most suitable and efficient systems for automated engineering calculations (CAE-system) is the ANSYS software. The purpose of this study was the comparative assessment of the elastic and elastoplastic deformation of 4×10 dental implants of different designs on the abutment-pin and screw-body interface, using the computer simulation of the stress-strain state. Materials and methods. Two kinds of dental implants were chosen for this study: a Liko-M 4×10 implant with the cylindrical body shape and a Liko-M DG 4×10 implant with a tapered body shape. The contact between the abutment and screw as well as the implant body and screw is frictional. The pre-tensioning of the screw from the initial tightening was 400 N. The load was applied to the cylindrical surface of the abutment at a percentage of its height. Results. Elastic and elastic-plastic calculations of the stress-strain state of Liko-M 4×10 and Liko-M DG 4×10 implants were performed. Besides the results of the main calculations of the stress-strain state of the implants Liko-M 4×10 and Liko-M DG 4×10, necessary to assess their static strength, we have also calculated the strength coefficients of implant bodies. Comparative analysis of the static strength of the Liko-M 4×10 and Liko-M DG 4×10 implants provides conclusions, which are significant for practical application of the implants.