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Volume 29 , Issue 4
July/August 2009

Pages 361-369

CT Scan–Based Finite Element Analysis of Premolar Cuspal Deflection Following Operative Procedures

Pascal Magne/Tevan Oganesyan

PMID: 19639057
DOI: 10.11607/prd.00.0872

The objective of this investigation was to present a novel method to facilitate and accelerate geometry acquisition/modification during the fabrication of finite element models of tooth restorations. Microcomputed tomographic data, stereolith­ography, and surface-driven automatic meshing were used to generate premolar finite element models with different occlusoproximal cavity preparations and cor­responding composite resin restorations. Occlusal loading was simulated by nonlinear contact analysis. Cuspal widening was measured and correlated with existing experimental data for model validation. Cuspal widening during application of a 150-N load ranged from 2.7 µm for the unrestored tooth to 5 to 179 µm for the different preparations and 3.5 to 6.9 µm for the different restorations. The described method was efficient and generated detailed and valid three-dimensional finite element models. These models were used to study the effect of restorative procedures on cuspal deflection and revealed high cuspal strains associated with mesio-occlusodistal preparations and restorations compared to individual two-surface preparations. This study confirmed that, whenever possible during removal of interdental decay, an intact marginal ridge should be maintained to avoid three-surface preparations such as the mesio-occlusodistal and the high cuspal strain associated with this design. (Int J Periodontics Restorative Dent 2009;29:361–369.)

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