Stress distribution in the cervical region of an upper central incisor in a 3D finite element model.
Braz Oral Res
; 23(2): 161-8, 2009.
Article
in En
| MEDLINE
| ID: mdl-19684951
ABSTRACT
The aim of this study was to evaluate the stress distribution in the cervical region of a sound upper central incisor in two clinical situations, standard and maximum masticatory forces, by means of a 3D model with the highest possible level of fidelity to the anatomic dimensions. Two models with 331,887 linear tetrahedral elements that represent a sound upper central incisor with periodontal ligament, cortical and trabecular bones were loaded at 45 masculine in relation to the tooth's long axis. All structures were considered to be homogeneous and isotropic, with the exception of the enamel (anisotropic). A standard masticatory force (100 N) was simulated on one of the models, while on the other one a maximum masticatory force was simulated (235.9 N). The software used were PATRAN for pre- and post-processing and Nastran for processing. In the cementoenamel junction area, tensile forces reached 14.7 MPa in the 100 N model, and 40.2 MPa in the 235.9 N model, exceeding the enamel's tensile strength (16.7 MPa). The fact that the stress concentration in the amelodentinal junction exceeded the enamel's tensile strength under simulated conditions of maximum masticatory force suggests the possibility of the occurrence of non-carious cervical lesions such as abfractions.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Bite Force
/
Tooth Cervix
/
Finite Element Analysis
/
Imaging, Three-Dimensional
/
Dental Stress Analysis
/
Incisor
Type of study:
Prognostic_studies
Limits:
Humans
Language:
En
Journal:
Braz Oral Res
Journal subject:
ODONTOLOGIA
Year:
2009
Document type:
Article
Affiliation country:
Brazil
Publication country:
BR
/
BRASIL
/
BRASILE
/
BRAZIL
/
BRESIL