Finite element analysis of an osseo-integrated dental implant.

摘要

Different methods of finite-element modeling of osseo-integrated dental implant were investigated. Two maxillary bone configurations were selected: (a) cortical bone, (b) cortical, cancellous, and graft bones. Two loading cases were used for each configuration: (a) axial force, (b) moment. Two models were used for the axial force: axi-symmetric and 3-dimensional; and 3 models for the moment: flat, axi-symmetric and 3-dimensional. Different models show similar results globally, but the 3-dimensional models show high stress concentrations associated with helicoidal threads. Stress is maximal towards the top of the implant. It is highest in the cortical bone, lower in the graft bone, and lowest in the cancellous bone. Stress for the moment load is up to 6 times higher than that of the axial load at the top of the implant, the difference diminishing towards the implant tip. An auxiliary study shows significant differences between perfect bonding and no bonding (with contact elements).