J Korean Acad Conserv Dent.  2008 May;33(3):246-257. 10.5395/JKACD.2008.33.3.246.

The influence of occlusal loads on stress distribution of cervical composite resin restorations: A three-dimensional finite element study

• Park CS
• Hur B
• Kim HC
• Kim KH
• Son K
• Park JK

• KMID: 2175987
• DOI: http://doi.org/10.5395/JKACD.2008.33.3.246

Abstract

The purpose of this study was to investigate the influence of various occlusal loading sites and directions on the stress distribution of the cervical composite resin restorations of maxillary second premolar, using 3 dimensional (3D) finite element (FE) analysis. 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). HyperMesh (Altair Engineering, Inc., Troy, USA) and ANSYS (Swanson Analysis Systems, Inc., Houston, USA) was used to mesh and analyze 3D FE model. Notch shaped cavity was filled with hybrid (Z100, 3M Dental Products, St. Paul, MN, USA) or flowable resin (Tetric Flow, Vivadent Ets., FL-9494-Schaan, Liechtenstein) and each restoration was simulated with adhesive layer thickness (40 microm). A static load of 200 N was applied on the three points of the buccal incline of the palatal cusp and oriented in 20degrees increments, from vertical (long axis of the tooth) to oblique 40degrees direction towards the buccal. The maximum principal stresses in the occlusal and cervical cavosurface margin and vertical section of buccal surfaces of notch-shaped class V cavity were analyzed using ANSYS. As the angle of loading direction increased, tensile stress increased. Loading site had little effect on it. Under same loading condition, Tetric Flow showed relatively lower stress than Z100 overall, except both point angles. Loading direction and the elastic modulus of restorative material seem to be important factor on the cervical restoration.

Keyword

Occlusal load; Stress distribution; Cervical restoration; Principal stress; Composite resin; Finite element analysis

MeSH Terms

Acrylic Resins
Adhesives
Axis, Cervical Vertebra
Bicuspid
Chimera
Composite Resins
Elastic Modulus
Finite Element Analysis
Polyurethanes
Acrylic Resins
Adhesives
Composite Resins
Polyurethanes

Figure

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  Figure 1 Disassembled 3D FE model: (a) cancellous bone, (b) cortical bone, (c) periodontal ligament, (d) dentin, (e) pulp, (f) enamel, (g) composite resin.

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  Figure 2 Schematic diagram of loading conditions.

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  Figure 3 Comparison reference nodes of buccal surface of notch-shaped lesion.

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  Figure 4 The maximum principal stress distribution of Z100 under various loading conditions.

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  Figure 5 The maximum principal stress distribution of Tetric Flow under various loading conditions.

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  Figure 6 The maximum principal stress distribution of occlusal cavosurface margin of Z100.

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  Figure 7 The maximum principal stress distribution of occlusal cavosurface margin of Tetric Flow.

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  Figure 8 The maximum principal stress distribution of cervical cavosurface margin of Z100.

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  Figure 9 The maximum principal stress distribution of cervical cavosurface margin of Tetric Flow.

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  Figure 10 The maximum principal stress distribution of vertical section of Z100.

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  Figure 11 The maximum principal stress distribution of vertical section of Tetric Flow.

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