THE SIMULATION ASSESSMENT OF THE VENEERING LAYERS OF PROSTHETIC CROWNS IN CONCENTRATED CONTACT

摘要

The aim of the study is to simulate and analyse the distributions of stresses and resultant displacements during concentrated loading of the layered material compositions used in prosthetic crowns in order to assess their resistance and demonstrate the impact of strength parameters of the veneer and framework on the transfer of external loads. The research materials are samples replicating the layered structure of prosthetic crowns. The load-bearing layers were made using CAD/CAM technology, and the dedicated veneering layers were fired or polymerized on the frameworks and constituted the top structure for cooperation during occlusion. If the material of the veneering layer differs from the material building the framework, for example, in the ceramic-metal type, spreading of the resultant displacements to the framework and high values of shear stress at the border of the veneering layer and the framework may be unfavourable and cause the veneer layer to chip off. This distribution of stresses and displacements may have a much smaller impact on the ceramic veneering of a ceramic or glass-ceramic framework, as both layers are much more homogeneous in terms of material.