J Korean Acad Conserv Dent.  2009 Sep;34(5):442-449. 10.5395/JKACD.2009.34.5.442.

The effects of dentin bonding agent thickness on stress distribution of composite-tooth interface : Finite element method

• Park SI
• Kim Y
• Roh BD

• KMID: 1986607
• DOI: http://doi.org/10.5395/JKACD.2009.34.5.442

Abstract

The aim of this study was to examine that thick dentin bonding agent application or low modulus composite restoration could reduce stresses on dentin bonding agent layer. A mandibular first premolar with abfraction lesion was modeled by finite element method. The lesion was restored by different composite resins with variable dentin bonding agent thickness (50microm, 100microm, 150microm). 170N of occlusal loading was applied buccally or lingually. Von Mises stress on dentin bonding agent layer were measured. When thickness of dentin bonding agent was increased von Mises stresses at dentin bonding agent were decreased in both composites. Lower elastic modulus composite restoration showed decreased von Mises stresses. On root dentin margin more stresses were generated than enamel margin. For occlusal stress relief at dentin boning agent layer to applicate thick dentin bonding agent or to choose low elastic modulus composite is recommended.

Keyword

Class V cavity; composite resin; dentin bonding agent; stress-distribution; finite element method

MeSH Terms

Bicuspid
Composite Resins
Dental Enamel
Dentin
Elastic Modulus
Composite Resins

Figure

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  Figure 1 2-D finite element model simulated in this study.

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  Figure 2 von Mises stress at Z100 when buccal loading applied

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  Figure 3 von Mises stress at Tetric Flow when buccal loading applied

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  Figure 4 von Mises stress at Z100 when lingual loading applied

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  Figure 5 von Mises stress at Tetric Flow when lingual loading applied

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  Figure 6 Principal stress vectors on adhesive when buccal loading applied

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  Figure 7 Principal stress vectors on adhesive when lingual loading applied

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