J Korean Acad Conserv Dent.  2007 Jan;32(1):69-79. 10.5395/JKACD.2007.32.1.069.

The influence of composite resin restoration on the stress distribution of notch shaped noncarious cervical lesion; A three dimensional finite element analysis study

• Lee CK
• Park JK
• Kim HC
• Woo SG
• Kim KH
• Son K
• Hur B

• KMID: 1986932
• DOI: http://doi.org/10.5395/JKACD.2007.32.1.069

Abstract

The purpose of this study was to investigate the effects of composite resin restorations on the stress distribution of notch shaped noncarious cervical lesion using three-dimensional (3D) finite element analysis (FEA). Extracted maxillary second premolar was scanned serially with Micro-CT (SkyScan1072; SkyScan, Aartselaar, Belgium). The 3D images were processed by 3D-DOCTOR (Able Software Co., Lexington, MA, USA). ANSYS (Swanson Analysis Systems, Inc., Houston, USA) was used to mesh and analyze 3D FE model. Notch shaped cavity was filled with hybrid or flowable resin and each restoration was simulated with adhesive layer thickness (40 microM). A static load of 500 N was applied on a point load condition at buccal cusp (loading A) and palatal cusp (loading B). The principal stresses in the lesion apex (internal line angle of cavity) and middle vertical wall were analyzed using ANSYS. The results were as follows 1. Under loading A, compressive stress is created in the unrestored and restored cavity. Under loading B, tensile stress is created. And the peak stress concentration is seen at near mesial corner of the cavity under each load condition. 2. Compared to the unrestored cavity, the principal stresses at the cemeto-enamel junction (CEJ) and internal line angle of the cavity were more reduced in the restored cavity on both load conditions. 3. In teeth restored with hybrid composite, the principal stresses at the CEJ and internal line angle of the cavity were more reduced than flowable resin.

Keyword

Notch shaped cavity; Class 5 restoration; Stress distribution; Finite element analysis; Hybrid composite resin; Flowable composite resin

MeSH Terms

Adhesives
Bicuspid
Finite Element Analysis*
Tooth
Tooth Cervix
Adhesives

Figure

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  Figure 1 Design of loading conditions on restored NCCL.

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  Figure 2 Simulated restoration of notch shaped NCCL. (Left; buccal view, Right; proximal view).

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  Figure 3 Principal stress highly concentrated at mesial CEJ and lesion apex under load A and B in unrestored cavity (Left; Maximal principal stress-tensile stress, Right; Minimal principal stress-compressive stress).

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  Figure 4 The principal stress distribution on lesion apex and middle vertical wall before restoration under load A and B. (MP: Mesial point angle, DP: Distal point angle, O: Occlusal cavosurface margin, D: DEJ, A: Lesion apex, C: Cervical cavosurface margin).

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  Figure 5 Principal stress distribution after each restoration (Max; Maximal principal stress-tensile stress, Min; Minimal principal stress-compressive stress).

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  Figure 6 The principal stress distribution on lesion apex and CEJ after restoration under load A and B.

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  Figure 7 The middle vertical distribution of principal stress on cavity wall after restoration under load A (upper) and B (lower).

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