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Creation of a three-dimensional model of the mandible and the TMJ in vivo by means of the finite element method.
Int J Comput Dent. 2002 Apr-Jul; 5(2-3):87-99.IJ

Abstract

The 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 articular disk was generated having 2 mm of thickness with the combination of spring-type (axial stiffness) and gap-type (contact) elements. The model was then analyzed with finite element method (FEM) software where a mesh was generated and values for Poisson's ratio, elasticity, and shear modulus were assigned. These were orthotropic for cancellous and cortical bone, and isotropic for dentin, periodontal ligament, articular disk, and temporal bone. The boundary conditions were defined restricting the nodes on the periphery of the temporal bone. It was therefore possible to generate a three-dimensional finite element model based on information obtained in vivo.

Authors+Show Affiliations

Castaño MC
Departamento de Ingeniería Mecánica, Universidad Eafit Medellín, Colombia.
Zapata U
No affiliation info available
Pedroza A
No affiliation info available
Jaramillo JD
No affiliation info available
Roldán S
No affiliation info available

MeSH

AdultFinite Element AnalysisHumansImaging, Three-DimensionalMaleMandibleMasticatory MusclesModels, AnatomicModels, DentalPeriodontal LigamentTemporomandibular JointTomography, X-Ray ComputedTooth

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng spa

PubMed ID

12680039

Citation

Castaño, M C., et al. "Creation of a Three-dimensional Model of the Mandible and the TMJ in Vivo By Means of the Finite Element Method." International Journal of Computerized Dentistry, vol. 5, no. 2-3, 2002, pp. 87-99.
Castaño MC, Zapata U, Pedroza A, et al. Creation of a three-dimensional model of the mandible and the TMJ in vivo by means of the finite element method. Int J Comput Dent. 2002;5(2-3):87-99.
Castaño, M. C., Zapata, U., Pedroza, A., Jaramillo, J. D., & Roldán, S. (2002). Creation of a three-dimensional model of the mandible and the TMJ in vivo by means of the finite element method. International Journal of Computerized Dentistry, 5(2-3), 87-99.
Castaño MC, et al. Creation of a Three-dimensional Model of the Mandible and the TMJ in Vivo By Means of the Finite Element Method. Int J Comput Dent. 2002 Apr-Jul;5(2-3):87-99. PubMed PMID: 12680039.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Creation of a three-dimensional model of the mandible and the TMJ in vivo by means of the finite element method. AU - Castaño,M C, AU - Zapata,U, AU - Pedroza,A, AU - Jaramillo,J D, AU - Roldán,S, PY - 2003/4/12/pubmed PY - 2003/5/16/medline PY - 2003/4/12/entrez SP - 87 EP - 99 JF - International journal of computerized dentistry JO - Int J Comput Dent VL - 5 IS - 2-3 N2 - The 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 articular disk was generated having 2 mm of thickness with the combination of spring-type (axial stiffness) and gap-type (contact) elements. The model was then analyzed with finite element method (FEM) software where a mesh was generated and values for Poisson's ratio, elasticity, and shear modulus were assigned. These were orthotropic for cancellous and cortical bone, and isotropic for dentin, periodontal ligament, articular disk, and temporal bone. The boundary conditions were defined restricting the nodes on the periphery of the temporal bone. It was therefore possible to generate a three-dimensional finite element model based on information obtained in vivo. SN - 1463-4201 UR - https://www.unboundmedicine.com/medline/citation/12680039/Creation_of_a_three_dimensional_model_of_the_mandible_and_the_TMJ_in_vivo_by_means_of_the_finite_element_method_ DB - PRIME DP - Unbound Medicine ER -