J Korean Acad Conserv Dent.  2008 Jan;33(1):28-38. 10.5395/JKACD.2008.33.1.028.

Stress distribution of Class V composite resin restorations: A three-dimensional finite element study

• Park JK
• Hur B
• Kim SK

• KMID: 1986747
• DOI: http://doi.org/10.5395/JKACD.2008.33.1.028

Abstract

This study was to investigate the influence of composite resins with different elastic modulus, cavity modification and occlusal loading condition on the stress distribution of restored notch-shaped noncarious cervical lesion using 3-dimensional (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 and a modified cavity with a rounded apex were modeled. Unmodified and modified cavities were filled with hybrid or flowable resin. 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. The results were as follows: 1. In the unrestored cavity, the stresses were highly concentrated at mesial CEJ and lesion apex and the peak stress was observed at the mesial point angle under both loading conditions. 2. After restoration of the cavity, stresses were significantly reduced at the lesion apex, however cervical cavosurface margin, stresses were more increased than before restoration under both loading conditions. 3. When restoring the notch-shaped lesion, material with high elastic modulus worked well at the lesion apex and material with low elastic modulus worked well at the cervical cavosurface margin. 4. Cavity modification the rounding apex did not reduce compressive stress, but tensile stress was reduced.

Keyword

Cervical lesion; class V lesion; composite resin; finite element analysis; stress distribution

MeSH Terms

Bicuspid
Chimera
Composite Resins
Elastic Modulus
Finite Element Analysis
Tooth Cervix
Composite Resins

Figure

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  Figure 1 Schematic diagram represents unmodified and modified cavity configuration (Left; Unmodified cavity, Right; Modified cavity).

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  Figure 2 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 3 The 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 4 Before restoration, the principal stress distribution on the lesion apex and CEJ (Apex & CEJ), cervical cavosurface margin (Cervical) under Load A and B (MP: Mesial point angle, DP: Distal point angle, Mes: Mesial node, Mid: Middle node, Dist: Distal node).

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  Figure 5 After restoration, the principal stress distribution in cervical cavity wall under Load A and B.

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  Figure 6 The principal stress distribution on lesion apex and CEJ after restoration under Load A and B (MP: Mesial point angle, DP: Distal point angle, Mes: Mesial node, Mid: Middle node, Dist: Distal node, M1: more mesial proximal point than MP).

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  Figure 7 The principal stress distribution on cervical cavosurface margin after restoration under Load A and B (MP: Mesial point angle, DP: Distal point angle, Mes: Mesial node, Mid: Middle node, Dist: Distal node).

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