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Paper Information

Journal:   JOURNAL OF DENTISTRY (SHIRAZ UNIVERSITY OF MEDICAL SCIENCES)   FALL 2002-WINTER 2003 , Volume 3 , Number 3-4 (5); Page(s) 39 To 49.
 
Paper: 

STRESS TENSOR MODIFICATION IN ALVEOLAR BONE RESORPTION: 3D ANALYSIS USING FINITE ELEMENT METHOD

 
 
Author(s):  GERAMI E.*
 
* ORTHODONTIC DEPARTMENT, SCHOOL OF DENTISTRY, SHIRAZ UNIVERSITY OF MEDICAL SCIENCES
 
Abstract: 

The main goal of this research was to evaluate the stress produced in tooth, PDM, spongy bone, and cortical bone consequent to force application (1 N) to the crown of an upper central incisor, while the alveolar bone resorbs gradually. Four 3-dimensional FEM models were designed (ARGue 392-5) with the same form except for their alveolar bone support that represented 1, 2.5, 5, and 6.5 mm of reduction. All the output data were compared with a normal model (ARGue 391). Normal stress in palato-labial direction (dY) and two shearing stresses (Tyz, Tyx) were evaluated. A progressive increase in all stress forms were found in all of the involved tissues in gradual steps of alveolar bone loss. Based upon this study, 2.5 mm of alveolar bone loss can be considered as the limit beyond which the normal stress changes accelerate. This limit is 5 mm for the shearing stresses. There were some clinical suggestions on the manner of force application and the appliance selection, based on the findings of this study, in the article.

 
Keyword(s): FINITE ELEMENT ANALYSIS, ALVEOLAR BONE RESORPTION, STRESS TENSOR
 
References: 
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