Numerical Analysis of Biomechanical Response of a DentalProsthesis with Regard to Bone-ImplantAdhesion Phenomena

摘要

Bone-implant interaction of endosseus oral implants is investigated by means of numerical models to describe their mechanical behaviour. The constitutive models of bone tissue include the definition of anisotropy,visco-elasticity and plasticity and are implemented in a finite element code for the analysis of phenomena induced by a non-passive connection between oral implants and framework. This condition induces relevant stress/strain fields that also depend on bone-implant adhesion process,as term capable of affecting the osteo-integration and the consequent stability of the implant. In particular,a fixed prosthesis placed in the premolar region of a mandible is modelled,made up of two implants connected by a framework. The mechanical state arising from die misfit is considered for its effects in dependence on the properties of peri-implant bone tissue and bone-implant interface configuration. Continuity or detachment with or without adhesion between implant and bone are considered and the consequent response of mandible-prosthesis system is evaluated. The investigation offers the possibility to evaluate the influence of interaction phenomena between implant and bone on the. biomechanical behaviour of the prosthetic system in condition of misfit and for different bone-implant adhesion configurations.