Effects of occlusal designs on a single implant and bone
Objectives: This study aims to investigate the influence of occlusal designs on the stress/strain distribution and bone remodeling in bone-simulated models of implant-supported single crowns. Methods: 3D finite element models of four occlusal designs with different cusp inclinations and occlusal table dimensions of implant-supported single crowns were constructed by using SolidWorks. Mechanical loads of 50, 100, 150, 200 and 250 N were applied at the central fossa and 2 mm buccally from the central fossa along the inclined plane. The data obtained from the previous in vitro strain gauges were used to verify the accuracy of the finite element models. In addition, a strain energy density obtained from 2D plane-strain finite element analysis was used as the mechanical stimulus to drive the cancellous and cortical bone remodeling in a bucco-lingual mandibular section. Results: The greater cusp inclination and larger occlusal table dimension resulted in greater von Mises stress/strain magnitude within the implant components and bone. With loading at 2 mm, stress/strain concentrated on the bone, adjacent to the neck of the implant and the most apical threads. Strains values obtained from the experiment were generally comparable to those of three-dimensional finite element analysis. Furthermore, the remodelling rate was relatively high in the first few months and gradually decreased until reaching its equilibrium. A large cusp inclination and horizontal offset lead to higher bone remodeling rate and greater interfacial stress. Conclusion: The dental implant superstructure design determines the load transmission pattern and thus can largely affect the bone remodeling activities. A reduced cusp inclination and occlusal table dimension effectively reduced maximum stress/strain on implant components and simulated bone. There was a mutual agreement between three-dimensional finite element analysis and in-vitro strain gauge analysis on the determination of strains under applied load.
Division: Australian/New Zealand Division Meeting
Meeting:2010 Australian/New Zealand Division Meeting (Kiama, New South Wales, Australia) Location: Kiama, New South Wales, Australia
Year: 2010 Final Presentation ID: Abstract Category|Abstract Category(s):Scientific Groups
Authors
Rungsiyakull, Pimduen
( University of Sydney, Sydney, N/A, Australia
)
Rungsiyakull, Chaiy
( University of Sydney, University of Sydney, N/A, Australia
)
Appleyard, Richard
( University of Sydney, Sydney, N/A, Australia
)
Li, Qing
( University of Sydney, Sydney, N/A, Australia
)
Klineberg, Iven
( University of Sydney, Westmead, N/A, Australia
)
Swain, Michael V.
( University of Sydney, Surry Hills, N/A, Australia
)