Development of 3D CAD/FEM Analysis System for Natural Teeth and Jaw Bone Constructed from X-Ray CT Images

Hasegawa, Aki; Shinya, Akikazu; Nakasone, Yuji; Lassila, Lippo; Vallittu, Pekka K.; Shinya, Akiyoshi

doi:10.1155/2010/659802

Cited by 23 publications

(16 citation statements)

References 24 publications

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“…The stress state patterns were qualitatively and quantitatively compared according to the first maximum principal stresses criterion for brittle materials [8,9,30,32,44,45], wherein the stresses inform about tensile behaviour in specific sites of the volumetric meshes.…”

Section: Methodsmentioning

confidence: 99%

Unravelling the Functional Biomechanics of Dental Features and Tooth Wear

et al. 2013

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Most of the morphological features recognized in hominin teeth, particularly the topography of the occlusal surface, are generally interpreted as an evolutionary functional adaptation for mechanical food processing. In this respect, we can also expect that the general architecture of a tooth reflects a response to withstand the high stresses produced during masticatory loadings. Here we use an engineering approach, finite element analysis (FEA), with an advanced loading concept derived from individual occlusal wear information to evaluate whether some dental traits usually found in hominin and extant great ape molars, such as the trigonid crest, the entoconid-hypoconulid crest and the protostylid have important biomechanical implications. For this purpose, FEA was applied to 3D digital models of three Gorilla gorilla lower second molars (M2) differing in wear stages. Our results show that in unworn and slightly worn M2s tensile stresses concentrate in the grooves of the occlusal surface. In such condition, the trigonid and the entoconid-hypoconulid crests act to reinforce the crown locally against stresses produced along the mesiodistal groove. Similarly, the protostylid is shaped like a buttress to suffer the high tensile stresses concentrated in the deep buccal groove. These dental traits are less functional in the worn M2, because tensile stresses decrease physiologically in the crown with progressing wear due to the enlargement of antagonistic contact areas and changes in loading direction from oblique to nearly parallel direction to the dental axis. This suggests that the wear process might have a crucial influence in the evolution and structural adaptation of molars enabling to endure bite stresses and reduce tooth failure throughout the lifetime of an individual.

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Section: Methodsmentioning

confidence: 99%

Unravelling the Functional Biomechanics of Dental Features and Tooth Wear

et al. 2013

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“…placed in the central basin of the tooth crown or on the cusp tips (i.e., [12], [13], [28], [29]). We have considered individual tooth-tooth contact scenarios, which might be more damaging to the tooth crown than food-tooth contacts, because more localized stresses increase [33].…”

Section: Discussionmentioning

confidence: 99%

“…The stress state patterns were qualitatively and quantitatively compared according to the first maximum principal stresses criterion for brittle materials [29], [30], [56], [65], [66], wherein the stresses inform about tensile behaviour in specific sites of the volumetric meshes.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, we tested the effects of tooth wear using three-dimensional (3D) FEA [27]. While in previous contributions based on 3D FEA less attention was devoted to the loading conditions, as most of the scholars simplify forces to point loads (i.e., [12], [13], [28], [29]), here we apply a newly developed advanced loading concept derived from the individual occlusal wear information [30], [31]. Lower premolars are often affected by NCCLs.…”

Section: Introductionmentioning

confidence: 99%

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The Evolutionary Paradox of Tooth Wear: Simply Destruction or Inevitable Adaptation?

Benazzi

Nguyễn

Schulz³

et al. 2013

PLoS ONE

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Over the last century, humans from industrialized societies have witnessed a radical increase in some dental diseases. A severe problem concerns the loss of dental materials (enamel and dentine) at the buccal cervical region of the tooth. This “modern-day” pathology, called non-carious cervical lesions (NCCLs), is ubiquitous and worldwide spread, but is very sporadic in modern humans from pre-industrialized societies. Scholars believe that several factors are involved, but the real dynamics behind this pathology are far from being understood. Here we use an engineering approach, finite element analysis (FEA), to suggest that the lack of dental wear, characteristic of industrialized societies, might be a major factor leading to NCCLs. Occlusal loads were applied to high resolution finite element models of lower second premolars (P2) to demonstrate that slightly worn P2s envisage high tensile stresses in the buccal cervical region, but when worn down artificially in the laboratory the pattern of stress distribution changes and the tensile stresses decrease, matching the results obtained in naturally worn P2s. In the modern industrialized world, individuals at advanced ages show very moderate dental wear when compared to past societies, and teeth are exposed to high tensile stresses at the buccal cervical region for decades longer. This is the most likely mechanism explaining enamel loss in the cervical region, and may favor the activity of other disruptive processes such as biocorrosion. Because of the lack of dental abrasion, our masticatory apparatus faces new challenges that can only be understood in an evolutionary perspective.

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“…Different imaging references can be used for the anatomy reproduction based on anatomical landmarks (Panagiotopoulou). These references can be obtained from pictures of Anatomy books (Rudolph et al, 2001), digital radiography (Kondo & Wakabayashi, 2009;Hasegawa et al, 2010), CT scans (Cattaneo et al, 2003;Sun et al;Motoyoshi et al, 2009;Poiate et al, 2008Poiate et al, , 2009Strait et al, 2010) and µCT scans (Cattaneo et al, 2008;Boryor et al, 2009;Panagiotopoulou et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Computer Graphics Applied to Anatomy: A Study of two Bio-CAD Modeling Methods on Finite Element Analysis of Human Edentulous Hemi-Mandible

et al. 2014

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Computer graphics applied to Anatomy: a study of two Bio-CAD modeling methods on finite element analysis of human edentulous hemi-mandible. Int. J. Morphol., 32(3):803-811, 2014. SUMMARY:Modeling is a step to perform a finite element analysis. Different methods of model construction are reported in literature, as the Bio-CAD modeling. The purpose of this study was to perform a model evaluation and application using two methods of Bio-CAD modeling from human edentulous hemi-mandible on the finite element analysis. From CT scans of dried human skull was reconstructed a stereolithographic model. Two methods of modeling were performed: STL conversion approach (Model 1) associated to STL simplification and reverse engineering approach (Model 2). For finite element analysis was used the action of lateral pterygoid muscle as loading condition to assess total displacement (D), equivalent von-Mises stress (VM) and maximum principal stress (MP). Two models presented differences on the geometry regarding surface number (1834 (model 1); 282 (model 2)). Were observed differences in finite element mesh regarding element number (30428 nodes/16683 elements (model 1); 15801 nodes/8410 elements (model 2). D, VM and MP stress areas presented similar distribution in two models. The values were different regarding maximum and minimum values of D (ranging 0-0.511 mm (model 1) and 0-0.544 mm (model 2), VM stress (6.36E-04-11.4 MPa (model 1) and 2.15E-04-14.7 MPa (model 2) and MP stress (-1.43-9.14 MPa (model 1) and -1.2-11.6 MPa (model 2). From two methods of Bio-CAD modeling, the reverse engineering presented better anatomical representation compared to the STL conversion approach. The models presented differences in the finite element mesh, total displacement and stress distribution.

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Development of 3D CAD/FEM Analysis System for Natural Teeth and Jaw Bone Constructed from X-Ray CT Images

Cited by 23 publications

References 24 publications

Unravelling the Functional Biomechanics of Dental Features and Tooth Wear

Unravelling the Functional Biomechanics of Dental Features and Tooth Wear

The Evolutionary Paradox of Tooth Wear: Simply Destruction or Inevitable Adaptation?

Computer Graphics Applied to Anatomy: A Study of two Bio-CAD Modeling Methods on Finite Element Analysis of Human Edentulous Hemi-Mandible

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