Analysis of strain gage method for measurement of post-gel shrinkage in resin composites.

Ronald Sakaguchi, A. Versluis, W. H. Douglas

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

OBJECTIVE: The objective of this study was to refine a strain gage method for measuring polymerization contraction of resin composites and to isolate the net post-gel contraction by identifying factors contributing to the measured strains. The hypothesis to be tested was that carefully controlled strain gage measurements of composite polymerization could isolate post-gel contraction events. METHODS: Composite was placed on a biaxial strain gage and light-cured. This method enabled real-time registration of the progress of shrinkage strain, corresponding to elastic modulus development. Strain from the two axes of the strain gage were averaged and plotted as a function of time. A representative curve was calculated from the mean of ten measurements. The following factors influencing the total contraction measurement were evaluated: thermal expansion of the gage, thermal expansion of the composite due to the exothermic reaction and exposure to the curing light, and adhesion of the composite to the gage. These parameters were measured so that the net deformation of the composite during polymerization could be calculated. RESULTS: Parametric studies of pre-cured and photointiator-free materials confirmed the hypothesis that strain gages measure post-gel contraction. Thermal artifacts were measured and subtracted from the total strain output. SIGNIFICANCE: Strain gages are suitable for measuring the clinically significant phase of composite polymerization contraction.

Original languageEnglish (US)
Pages (from-to)233-239
Number of pages7
JournalDental materials : official publication of the Academy of Dental Materials
Volume13
Issue number4
StatePublished - Jul 1997

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Composite Resins
Strain gages
Polymerization
Gels
Resins
Hot Temperature
Composite materials
Light
Elastic Modulus
Gages
Thermal expansion
Artifacts
Exothermic reactions
Curing
Adhesion
Elastic moduli

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Analysis of strain gage method for measurement of post-gel shrinkage in resin composites. / Sakaguchi, Ronald; Versluis, A.; Douglas, W. H.

In: Dental materials : official publication of the Academy of Dental Materials, Vol. 13, No. 4, 07.1997, p. 233-239.

Research output: Contribution to journalArticle

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