J Korean Acad Conserv Dent.  2011 May;36(3):188-195. 10.5395/JKACD.2011.36.3.188.

Evaluation of polymerization shrinkage stress in silorane-based composites

• Ryu SJ
• Cheon JH
• Min JB

• KMID: 1986682
• DOI: http://doi.org/10.5395/JKACD.2011.36.3.188

Abstract

OBJECTIVES
The purpose of this study was to evaluate the polymerization shrinkage stress among conventional methacrylate-based composite resins and a silorane-based composite resin.
MATERIALS AND METHODS
The strain gauge method was used for the determination of polymerization shrinkage strain. Specimens were divided by 3 groups according to various composite materials. Filtek Z-250 (3M ESPE) and Filtek P-60 (3M ESPE) were used as a conventional methacrylate-based composites and Filtek P-90 (3M ESPE) was used as a silorane-based composites. Measurements were recorded at each 1 second for the total of 800 seconds including the periods of light application. The results of polymerization shrinkage stress were statistically analyzed using One way ANOVA and Tukey test (p = 0.05).
RESULTS
The polymerization shrinkage stress of a silorane-based composite resin was lower than those of conventional methacrylate-based composite resins (p < 0.05). The shrinkage stress between methacrylate-based composite resin groups did not show significant difference (p > 0.05).
CONCLUSIONS
Within the limitation of this study, silorane-based composites showed lower polymerization shrinkage stress than methacrylate-based composites. We need to investigate more into polymerization shrinkage stress with regard to elastic modulus of silorane-based composites for the precise result.

Keyword

Methacrylate composite; Polymerization shrinkage stress; Silorane composite; Strain gauge

MeSH Terms

Composite Resins
Elastic Modulus
Light
Polymerization
Polymers
Sprains and Strains
Composite Resins
Polymers

Figure

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  Figure 1 Structure of strain gauge.

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  Figure 2 Schematic diagram of specimen and preparation.

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  Figure 3 Analysis of stress in a thick-walled acrylic ring.

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  Figure 4 Change of shrinkage stress (MPa) in each group for 800 seconds.

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