Stress distribution on dentin-cement-post interface varying root canal and glass fiber post diameters. A three-dimensional finite element analysis based on micro-CT data
J. appl. oral sci
;
21(6): 511-517, Nov-Dec/2013. tab, graf
Article
in English
| LILACS, BBO
| ID: lil-697821
ABSTRACT
Objective:
The aim of the present study was to analyze the influence of root canal and glass fiber post diameters on the biomechanical behavior of the dentin/cement/post interface of a root-filled tooth using 3D finite element analysis. Material andMethods:
Six models were built using micro-CT imaging data and SolidWorks 2007 software, varying the root canal (C) and the glass fiber post (P) diameters C1P1-C=1 mm and P=1 mm; C2P1-C=2 mm and P=1 mm; C2P2-C=2 mm and P=2 mm; C3P1-C=3 mm and P=1 mm; C3P2-C=3 mm and P=2 mm; and C3P3-C=3 mm and P=3 mm. The numerical analysis was conducted with ANSYS Workbench 10.0. An oblique force (180 N at 45º) was applied to the palatal surface of the central incisor. The periodontal ligament surface was constrained on the three axes (x=y=z=0). Maximum principal stress (σmax) values were evaluated for the root dentin, cement layer, and glass fiber post.Results:
The most evident stress was observed in the glass fiber post at C3P1 (323 MPa), and the maximum stress in the cement layer occurred at C1P1 (43.2 MPa). The stress on the root dentin was almost constant in all models with a peak in tension at C2P1 (64.5 MPa).CONCLUSION:
The greatest discrepancy between root canal and post diameters is favorable for stress concentration at the post surface. The dentin remaining after the various root canal preparations did not increase the stress levels on the root. .
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Post and Core Technique
/
Dental Cements
/
Dental Pulp Cavity
/
Dentin
/
Glass
Type of study:
Evaluation studies
Limits:
Humans
Language:
English
Journal:
J. appl. oral sci
Journal subject:
Dentistry
Year:
2013
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Univ. Estadual Paulista/BR
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