J Korean Acad Conserv Dent.  2008 May;33(3):184-197. 10.5395/JKACD.2008.33.3.184.

The influence of combining composite resins with different elastic modulus on the stress distribution of Class V restoration: a three-dimensional finite element study

• Park JK
• Hur B
• Kim SK

• KMID: 2175981
• DOI: http://doi.org/10.5395/JKACD.2008.33.3.184

Abstract

This study was to investigate the influence of combining composite resins with different elastic modulus, and occlusal loading condition on the stress distribution of restored notch-shaped non-carious cervical lesion using 3D finite element (FE) analysis. 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. A notch-shaped cavity was modeled and filled with hybrid, flowable resin or a combination of both. After restoration, a static load of 500N was applied in a point-load condition at buccal cusp and palatal cusp. The stress data were analyzed using analysis of principal stress.
Results
showed that combining method such that apex was restored by material with high elastic modulus and the occlusal and cervical cavosurface margin by small amount of material with low elastic modulus was the most profitable method in the view of tensile stress that was considered as the dominant factor jeopardizing the restoration durability and promoting the lesion progression.

Keyword

Non-carious cervical lesion; Stress distribution; Composite resin; Elastic modulus; Finite element analysis

MeSH Terms

Bicuspid
Chimera
Composite Resins
Elastic Modulus
Finite Element Analysis
Composite Resins

Figure

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  Figure 1 3 dimensional finite element model of notch shaped cavity.

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  Figure 2 Simulated restorations of notch-shaped NCCL (Upper left; Z100-dark brown, Upper right; Tetric Flow-light brown, Lower left; Combination 1, Lower right; Combination 2).

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  Figure 3 Schematic diagram of loading points (A; Perpendicular load on the upper third of the palatal slope of the buccal cusp, B; perpendicular load on the upper third of the buccal slope of the palatal cusp).

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  Figure 4 Node selection (left) and magnified aspects (right) of mesial corner of notch-shaped lesion. Along the cavity 4 lines, each 4 nodes were selected at the 3 areas (MP: Mesial point angle, DP: Distal point angle, M1: Nodes near mesial point angle, CEJ: Cemento-enamel junction, Occ: Occlusal cavosurface margin, DEJ: Dentino-enamel junction, Apex: Lesion apex).

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  Figure 5 Principal stress distribution of notch-shaped cavity before restoration (Left; Minimum principal stress-Compressive stress, Right; Maximum principal stress-Tensile stress. Upper and lower view's scales were different each other).

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  Figure 6 The compressive and tensile stress distribution on occlusal cavosurface margin (Occlusal), DEJ, lesion apex and CEJ (Apex & CEJ), cervical cavosurface margin (Cervical) under Load B (MP: Mesial point angle, DP: Distal point angle, Mes: Mesial node, Mid: Middle node, Dist: Distal node).

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  Figure 7 The Principal stress distribution under Load A and B.

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  Figure 8 The compressive and tensile stress distribution on occlusal cavosurface margin after restoration under Load B (MP: Mesial point angle, DP: Distal point angle, Mes: Mesial node, Mid: Middle node, Dist: Distal node).

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  Figure 9 The compressive and tensile stress distribution on occlusal DEJ after restoration under Load B (MP: Mesial point angle, DP: Distal point angle, Mes: Mesial node, Mid: Middle node, Dist: Distal node).

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  Figure 10 The compressive and tensile stress distribution on lesion apex and CEJ after restoration under Load B (MP: Mesial point angle, DP: Distal point angle, Mes: Mesial node, Mid: Middle node, Dist: Distal node).

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  Figure 11 The compressive and tensile stress distribution on cervical cavosurface margin after restoration under Load B (MP: Mesial point angle, DP: Distal point angle, Mes: Mesial node, Mid: Middle node, Dist: Distal node).

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