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- Original Article Effects of occlusal load on the stress distribution of four cavity configurations of noncarious cervical lesions: A three-dimensional finite element analysis study
- Sang-Je Jeon1, Jeong-Kil Park1, Hyeon-Cheol Kim1, Sung-Gwan Woo2, Kwang-Hoon Kim2, Kwon Son2, Bock Hur1,*
-
J Korean Acad Conserv Dent 2006;31(5):-370.
DOI: https://doi.org/10.5395/JKACD.2006.31.5.359
Published online: January 14, 2006
1Department of Conservative dentistry, College of Dentistry, Pusan National University
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- *Corresponding Author: Bock Hur, Department of Conservative Dentistry, College of Dentistry, Pusan National University, 1-10, Ami-dong, Seo-gu, Busan, 602-739, Korea, Tel: 82-51-240-7455, E-mail: bhur@pusan.ac.kr
• Received: July 4, 2006 • Revised: July 28, 2006 • Accepted: September 4, 2006
Copyright © 2006 The Korean Academy of Conservative Dentistry
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Abstract
-
The objective of this study was to investigate the effect of excessive occlusal loading on stress distribution on four type of cervical lesion, using a three dimensional finite element analysis (3D FEA).The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. Four different lesion configurations representative of the various types observed clinically for teeth were studied. A static point load of 500N was applied to the buccal and lingual cusp (Load A and B). The principal stresses in lesion apex, and vertical sectioned margin of cervical wall were analyzed.The results were as follows
The patterns of stress distribution were similar but the magnitude was different in four types of lesion.
The peak stress was observed at mesial corner and also stresses concentrated at lesion apex.
The compressive stress under load A and the tensile stress under load B were dominant stress.
Under the load, lesion can be increased and harmful to tooth structure unless restored.
Figure 3.
The Principal stress distribution of four cavities under Load A and B(Upper 2 rows: maximal and minimal principal stress under load A, Lower 2 rows; maximal and minimal principal stress under load B. From left line, notch-shape showed, followed by saucer, combined, U-shape lesion)
Figure 4.
Principal stresses of lesion apex of 4 shape lesion.
(M1, M2, M3, M4: nodes near mesial point angle, D1, D2, D3, D4: nodes near distal point angle. If the value of one principal stress of an element was positive, the element was determined to be in the tensile condition, if it was negative, the element was determined to be in the compressive condition).
Figure 5.
Vertical distribution of principal stresses at cavity wall in 4 shape lesion. (If the value of one principal stress of an element was positive, the element was determined to be in the tensile condition, if it was negative, the element was determined to be in the compressive condition).
Table 1.
Numbers of nodes and elements for each cavity
| Model | Notch | Saucer | Combined | U |
|---|---|---|---|---|
| Node | 18245 | 18236 | 18434 | 18709 |
| Element | 16668 | 16668 | 16780 | 17056 |
Table 2.
Mechanical properties of the tooth used in the study
Table 3.
Mechanical properties of teeth (MPa)*
| Compressive strength of enamel | 277 – 384 |
|---|---|
| Compressive strength of dentin | 249 – 347 |
| Tensile strength of enamel | 10 – 24 |
| Tensile strength of dentin | 32 – 103 |
| Tensile strength of DEJ | 52 |
Table 4.
Peak stresses of lesion apex of four cavities
| Load A | Load B | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1st Peak | 2nd Peak | 1st Peak | 2nd Peak | ||||||
| MPa | Node | MPa | Node | MPa | Node | MPa | Node | ||
| Notch | Max | 12.4 | 6 | 10.9 | 20 | 193* | 1 | 104.3* | 5 |
| Min | -558* | 1 | -279* | 13 | 40.2 | 6 | NS | NS | |
| Saucer | Max | 14.6 | 1 | 8.8 | 16 | 123.0* | 1 | 55.8* | 13 |
| Min | -330.0* | 1 | -203.3 | 13 | NS | NS | NS | NS | |
| Combined | Max | 10.0 | M1 | 18.3 | D3 | 195.5* | 1 | 108.3* | 6 |
| Min | -606.7* | 1 | -320.7* | 7 | NS | NS | NS | NS | |
| U | Max | 17.8 | D3 | 13.9 | M1 | 147.9* | 1 | 71.1* | 7 |
| Min | -500.9* | 1 | -268.7* | 13 | NS | NS | NS | NS | |
Table 5.
Peak stresses values of inner cavity wall vertically
| Load A | Load B | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1st Peak | 2nd Peak | 1st Peak | 2nd Peak | ||||||
| MPa | Node | MPa | Node | MPa | Node | MPa | Node | ||
| Notch | Max | 33.7* | 4 | 25.5 | 17 | 104.3* | 13 | NS | NS |
| Min | -280.4* | 13 | -58.8 | 18 | 40.2 | 13 | NS | NS | |
| Saucer | Max | 30.8 | 3 | 15.2 | 17 | 61.9* | 13 | 53.0* | 16 |
| Min | -157.1 | 10 | -98.1 | 16 | 7.8 | 9 | 4.4 | 13 | |
| Combined | Max | 36.8 | 17 | 14.7 | 6 | 108.3* | 9 | 42.0* | 19 |
| Min | -317.7* | 1 | -44.2 | 19 | 41.1 | 9 | NS | NS | |
| U | Max | 36.01 | 19 | 11.3 | 6 | 100.7* | 15 | 76.6* | 9 |
| Min | -240.5 | 10 | -207.3 | 15 | 22.7 | 9 | 2.7 | 15 | |
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XML DownloadEffects of occlusal load on the stress distribution of four cavity configurations of noncarious cervical lesions: A three-dimensional finite element analysis study
Figure 1. Four types of lesion configurations.
Figure 2. Design of loading conditions.
Figure 3. The Principal stress distribution of four cavities under Load A and B(Upper 2 rows: maximal and minimal principal stress under load A, Lower 2 rows; maximal and minimal principal stress under load B. From left line, notch-shape showed, followed by saucer, combined, U-shape lesion)
Figure 4. Principal stresses of lesion apex of 4 shape lesion.
Figure 5. Vertical distribution of principal stresses at cavity wall in 4 shape lesion. (If the value of one principal stress of an element was positive, the element was determined to be in the tensile condition, if it was negative, the element was determined to be in the compressive condition).
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Effects of occlusal load on the stress distribution of four cavity configurations of noncarious cervical lesions: A three-dimensional finite element analysis study
| Model | Notch | Saucer | Combined | U |
|---|---|---|---|---|
| Node | 18245 | 18236 | 18434 | 18709 |
| Element | 16668 | 16668 | 16780 | 17056 |
| Materials | Mechanical properties Young's modulus (MPa) | Poisson's ratio (υ) |
|---|---|---|
| Enamel | 84000 a | 0.33 a |
| Dentin | 18000 a | 0.31 a |
| Periodontal ligament | 0.667 b | 0.49 b |
| Cancellous bone | 13700 b | 0.38 b |
| Cortical bone | 34000 b | 0.26 b |
| Compressive strength of enamel | 277 – 384 |
|---|---|
| Compressive strength of dentin | 249 – 347 |
| Tensile strength of enamel | 10 – 24 |
| Tensile strength of dentin | 32 – 103 |
| Tensile strength of DEJ | 52 |
| Load A | Load B | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1st Peak | 2nd Peak | 1st Peak | 2nd Peak | ||||||
| MPa | Node | MPa | Node | MPa | Node | MPa | Node | ||
| Notch | Max | 12.4 | 6 | 10.9 | 20 | 193 |
1 | 104.3 |
5 |
| Min | -558 |
1 | -279 |
13 | 40.2 | 6 | NS | NS | |
| Saucer | Max | 14.6 | 1 | 8.8 | 16 | 123.0 |
1 | 55.8 |
13 |
| Min | -330.0 |
1 | -203.3 | 13 | NS | NS | NS | NS | |
| Combined | Max | 10.0 | M1 | 18.3 | D3 | 195.5 |
1 | 108.3 |
6 |
| Min | -606.7 |
1 | -320.7 |
7 | NS | NS | NS | NS | |
| U | Max | 17.8 | D3 | 13.9 | M1 | 147.9 |
1 | 71.1 |
7 |
| Min | -500.9 |
1 | -268.7 |
13 | NS | NS | NS | NS | |
| Load A | Load B | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1st Peak | 2nd Peak | 1st Peak | 2nd Peak | ||||||
| MPa | Node | MPa | Node | MPa | Node | MPa | Node | ||
| Notch | Max | 33.7 |
4 | 25.5 | 17 | 104.3 |
13 | NS | NS |
| Min | -280.4 |
13 | -58.8 | 18 | 40.2 | 13 | NS | NS | |
| Saucer | Max | 30.8 | 3 | 15.2 | 17 | 61.9 |
13 | 53.0 |
16 |
| Min | -157.1 | 10 | -98.1 | 16 | 7.8 | 9 | 4.4 | 13 | |
| Combined | Max | 36.8 | 17 | 14.7 | 6 | 108.3 |
9 | 42.0 |
19 |
| Min | -317.7 |
1 | -44.2 | 19 | 41.1 | 9 | NS | NS | |
| U | Max | 36.01 | 19 | 11.3 | 6 | 100.7 |
15 | 76.6 |
9 |
| Min | -240.5 | 10 | -207.3 | 15 | 22.7 | 9 | 2.7 | 15 | |
Table 1. Numbers of nodes and elements for each cavity
Table 2. Mechanical properties of the tooth used in the study
a: Katona
Table 3. Mechanical properties of teeth (MPa)*
: Litonjua
Table 4. Peak stresses of lesion apex of four cavities
: Excessive stresses over the failure range. NS: Not significant
Table 5. Peak stresses values of inner cavity wall vertically
: Excessive stresses over the failure range. NS: Not significant
