Biomechanical analysis of clamping system for fixation of prosthesis-obturator

The increase of the level of injuries with damage in the maxillofacial region and the number of patients with jaw bone formation leads to the development of persistent esthetic and functional disorders. The severity of these disorders is determined by the volume of the defect. The greatest difficulty in orthopedic treatment is acquired defects of the upper jaw with the presence of oronasal compound. In this case, it is necessary to solve the problems of fixing the prosthesis, substitution of the functional and esthetic integrity of the maxillofacial system, creation of hermeticism at the border of connection of the oral cavity with the nasal cavity. Paper deals with biomechanical analysis of stress-strain state in the human dentofacial system induced by prosthesis-obturator installation. Prosthesis is made from suggested polyamide material Vertex ThermoSens with inclusion of nanostructured titanium dioxide up to one percent of mass. Main attention is paid to influence of clamper occlusion plate on stress distribution in the tooth at the maximal occlusion loads. Computations are conducted in the frame of linear theory of elasticity for isotropic body. The computer-aided design model is constructed based on 3D-scanning of the prosthesis-obturator. As a result of calculations, a substantiation of the clamping system for fixing the prosthesis-obturator with the use of suggested material and a type of supporting-retaining clamp is given. The obtained stresses are less than the maximum permissible stresses in the material. At the border of the tooth-clamper arm, there are also no critical stresses.