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A three-dimensional jaw bone model consisting of maxilla and mandible was constructed using CT-images. The distribution of Young's modulus was also estimated from the bone density distribution. The developed model was then applied to analyze the effect of a spherical cyst located in the mandible on the mechanical condition in the jaw bone using the finite element method. An occlusion condition was used as the boundary condition by employing muscle forces. It was found that the strain energy density was concentrated in the several regions in the vicinity of the cyst, and the regions were generated by both tensile and compressive stress concentrations. It is thus concluded that this kind of 3-D modeling could clinically be used for predicting the risk of fracture of jaw bones.
2013 •
2012 •
Finite Element Analysis using geometrical 3D models obtained from medical imaging is a widely used method in the study of the mechanical properties of jawbone and dentition with important contributions in diagnosis, treatment, and outcome assessment. Numerical analysis in biomechanics seems promising yet it requires a careful reconstruction of specimens to make analysis reliable and feasible. A semi-automatic approach is described for the classification of the solid tissues of jawbone for a subsequent construction of a 3D geometrical model of mandible from CT images to perform a Finite Element mechanical analysis. Mechanical properties of jawbone in fifteen women at different stage of life were studied. Differences in displacement were found statistically significant among age groups, ANOVA test, F=2.75, p=0.04. Preliminary results differentiate biomechanical parameters of jawbone among life span in women concordant with findings in different studies using other techniques.
Applied Mechanics and Materials
Comparative Study of Mechanical Properties of Bone Tissue Based on the CT and the µCT Slices2012 •
This article deals with presentation of data processing obtained from imaging CT (computer tomography) and micro CT devices. These methods enable to perform bone tissue density analysis by non-invasive way. The image processing methods, by which it is possible to determine mechanical properties of bone tissue, are described in this paper. Further, a creation of a computational model with different bone density of cancellous tissue is described and afterwards the stress strain analysis is performed. The mandible segments with different bone density were used as samples. Results show significantly higher stresses are reached in a cancellous bone tissue with worse bone quality.
International journal of computerized dentistry
Creation of a three-dimensional model of the mandible and the TMJ in vivo by means of the finite element methodThe aim of this study was to develop a three-dimensional finite element model of the mandible, including its TMJ. The model consisted of 7942 nodes and 41,010 elements, which were obtained from a convergence test, done to minimize the result error. It included cancellous and cortical bone, periodontal ligament, masticatory muscles (masseters, temporalis, lateral and internal pterygoids), teeth and the articular disk. All characteristics such as dental, mandibular, and muscle geometry were obtained from a computerized tomography (CT) of a living person. CT sections were scanned and digitized with a CAD software program. After images were adequately assembled, a vertical tracing was done which allowed the definition of a three-dimensional mesh. Modeling of teeth was carried out independently and the periodontal ligament was later included, limiting the alveolar area. Muscles were modeled based on flat-scale photographs and total muscle force was distributed in multiple vectors. The ar...
The main objective was to examine the biomechanical behavior of the mandible under standardized trauma and to develop models of biomechanical responses when the mandible is subjected to various simulated impacts. A homogenous model based on the bone’s average mechanical properties was used. To simulate external loads on the mandible, forces on the chin, forces in an anteroposterior direction, and forces from the basilar edge were applied. To simulate mandibular biomechanics, we employed a model created in the ANSYS v19.0 software. The skull with the temporomandibular joint (TMJ) from the Grabcad website was used as the geometric mandibular model. We attempted to simulate the stresses developed in the mandible by impact forces. The amount of force (F) corresponded to the fall of a five-kilogram body (the head), from a height of two meters (F = 6666.7 N). The impact force was applied perpendicular to an arbitrary surface of an area of 10−3 m2. Impact on the chin region and lateral imp...
Pesquisa Brasileira em Odontopediatria e Clínica Integrada
Simulation of Stress Distribution on the Upper First Molar and Alveolar Bone with the Transpalatal Arch and Upper Second Molar Using Finite Element Analysis2019 •
ABSTRACT Introduction: Human teeth are composed of different types of tissues which differ in their structure and biomechanical properties. Analysis of the distribution and concentration of stresses along these structures is a complex process. Mandibular first premolar has a specific morphology and occlusal contacts and could be considered as a transition form of anterior and posterior teeth. The aim of this study was to evaluate the distribution and concentration of stress of a lower first premolar using finite element method (FEM) of analysis with the highest possible level of similarity to the anatomic characteristics. Material and methods: A three-dimensional model of the mandibular premolar is gained from a μCT x-ray image. Using the FEM we analyzed straining of the enamel, dentin and periodontal ligament under axial forces. The following software solutions were used in the analysis: CT images processing - CTAn network program and FEM analysis -AnsysWorkbench 14.0. Results: St...
Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
Finite element analysis of the human mandible at 3 different stages of life2010 •
This study analyzed detailed models of human mandibles at 3 different stages of life with simulation of supra normal chewing forces at static conditions. Finite element analysis (FEA) was used to generate models from cone-beam computerized tomograms (CBCT) of 3 patients aged 12, 20, and 67 years, using numerically calculated material parameters. Estimated chewing forces were then applied to the simulations. The results reflect higher elasticity in younger models in all regions of the mandible. The experimental models show that physiologic load stress and strain distributional changes of the mandible vary according to age. The CBCT-based model generation used in this study provided high-quality model definition of the 3 individual patients of different ages. FEA has great potential to predict bone responses to paradigms of mechanical activity. Future applications of FEA will include surgical planning, surgical hardware testing, and the design of scaffolds and tissue-engineered constructs.
Archives of Internal Medicine
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Arxiv preprint ArXiv:1006.3797
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Therapeutic Advances in Reproductive Health
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2015 •
17ª Conferência Internacional da LARES
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Physiological and Molecular Plant Pathology
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2020 •
Czechoslovak Journal of Physics
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