Foundations of geometric modelling of fixed immediate dentures-prototypes

The need to improve the design of dentures for replacing the included defects in dentition is associated with individual features of the structure of bone tissues and personified geometric characteristics of the prosthesis design. Modern computer design allows you to create geometric models of supporting teeth - prosthesis - jaw directly on the patient's tomogram. Simulation of the process of immediate dentures installation is necessary for preliminary planning of prosthetics and assessment of the load on the dentures. The purpose of the study is to compare the functional loading of classical dentures with a vertical fixation of a crown with a construction with a horizontal fixation method. Dentures of small length with one facet and fixation on two supporting molars are considered. The main types of loading for the structure and the maximum load-bearing load are calculated based on the evaluation of strength by the Mises criterion. The calculations are performed using the software complexes Mimics, SolidWorks, Nastran, Patran. On the 3D model, the stress-strain state of the structural component of the biological organism is studied on the example of bounded edentulous space with artificial inclusions on the basis of the finite element method. The spatial raster model obtained with the help of computer tomography cannot be directly used for numerical analysis. Applications allow you to move from slices to three-dimensional objects with the possibility of structural analysis of the system depending on the density of the tissue structure. A complex approach is proposed for geometric reconstruction of a biomechanical object according to computed tomography implying the creation of discrete facet models of the surfaces of teeth and jaws and the restoration of a solid CAD model.