FINITE ELEMENT BASED PREDICTIONS OF MANDIBULAR BONE REMODELLING AROUND THREE-UNIT FIXED PARTIAL DENTURES (FPD)

摘要

Bone remodelling computation algorithms have been applied to orthopaedics for more than 30 years and the first attempts applied towards dental restorations were made only in the 1990s. There is a need to further develop a quantitative basis for understanding mandibular bone remodelling. The purpose of this study is to develop a mechanical based phenomenological model capable of describing and predicting mandibular bone remodelling post-insertion of a fixed partial denture (FPD). Three-dimensional (3-D) finite element method (FEM) models are utilised to determine the biomechanical responses to masticatory loading in the right anterior region of the mandible. Equivalent strains and bone densities are analysed and correlated to a trilinear curve to quantify formation, resorption or equilibrium bone response. Equivalent strain and bone density results show there is considerable resorption within the distal region of bone underlying the FPD. Considerable resorption is also seen at the buccal region. A fundamental design criterion for an FPD is to institute compatibility with its surrounding living tissues. The vitality of bone about a FPD is of primary importance as the condition of bone can in turn affect the stability of the FPD considerably. The biomechanical responses observed can provide meaningful insight into restorative treatment planning, clinical procedures and fixed prosthodontics designs.