Three-dimensional finite element modeling from CT images of tooth and its validation

Division of Biomaterials, Kyushu Dental College, 2-6-1 Manazuru, Kokurakita, Kitakyushu 803-8580, Japan.
Dental Materials Journal (Impact Factor: 0.97). 04/2009; 28(2):219-26. DOI: 10.4012/dmj.28.219
Source: PubMed


The aim of this study was to develop a three-dimensional (3D) finite element (FE) model of a sound extracted human second premolar from micro-CT data using commercially available software tools. A detailed 3D FE model of the tooth could be constructed and was experimentally validated by comparing strains calculated in the FE model with strain gauge measurement of the tooth under loading. The regression coefficient and its standard error in the regression analysis between strains calculated by the FE model and measured with strain gauge measurement were 0.82 and 0.06, respectively, and the correlation coefficient was found to be highly significant. These results suggested that an FE model reconstructed from micro-CT data could be used as a valid model to estimate the actual strains with acceptable accuracy.

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    • "However, it is difficult to systemize the data, as tooth dimensions and experimental conditions are not usually included. From a theoretical standpoint, many studies have been made of stress distributions in loaded teeth using conventional finite element modeling (FEM) codes [24] [25] [26] [27] [28] [29] [30] [31] [32], but these can say virtually nothing about how stable fractures evolve. They certainly cannot account for any stages of crack arrest in the enamel and subsequent penetration into the dentin interior [13]. "
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    • "Twodimensional or three-dimensional approaches have been used for modeling purposes [6]. Two-dimensional models are criticized as they result in oversimplified geometries of complex structures that in turn may compromise the reliability of predicting the mechanical behavior of the object [7] [14] [15]. "
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    • "3D-FEA has been validated by various experimental studies, and it was proved that micro-CT-based 3D-FEA is a valid research method [27, 28]. In this study 3D-FEA, the upper canine tooth model was reconstructed from a segmented micro-CT data which is a sophisticated model representing an upper canine tooth subjected to all possible occlusal loading scenarios to estimate the actual strains of enamel and dentine tissues within acceptable accuracy limits [29]. The fact that both axial and non-axial loading were investigated together in order to simulate parafunctional loading (Bruxism) which is usually pronounced with simultaneous loading in different direction. "
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