A study of localized curing of glass-filled composites using microhardness measurements

B. Abedian, Franklin Garcia-Godoy, F. Garcia-Godoy

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Extent of cure of hybrid composite systems is examined by conducting hardness measurements at different stages of the photopolymerization reaction and obtaining kinetic parameters that matched the experimental data. The materials are commercial dental composites based on bis[4-(2-hydroxy-3- methacryloyloxypropoxy)phenyl]propane resins with different photoinitiator concentrations as well as filler particle sizes and combinations. Samples (five per group) were made using nylon molds (2.5 × 5 mm) of the tested composites. The samples were light cured with a constant-power light source for durations up to 20 s. After curing, all samples underwent Vicker's hardness testing of top and bottom surfaces. While there are significant differences in the polymerization behavior between the top and bottom locations for the tested composites, the corresponding growth exponent n, a kinetic parameter in the kinetic theory, is very close in all cases. For the tested materials the coefficient factor k is much lower for the bottom surfaces compared with the top surfaces. This reduction in the value of k is more severe for the material with a higher concentration of the photoinitiator as well as a higher percentage of glass filler particles in the wavelength range affecting the photopolymerization. It is argued that a relationship between k and the irradiation intensity can be used to quantify the decay of irradiated light with its penetration into the composites. The comparisons can be used to draw preliminary conclusions on the parameters controlling the effective depth of cure in a hybrid composite.

Original languageEnglish (US)
Pages (from-to)426-431
Number of pages6
JournalJournal of Applied Polymer Science
Volume97
Issue number1
DOIs
StatePublished - Jul 5 2005
Externally publishedYes

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Microhardness
Curing
Glass
Photopolymerization
Composite materials
Kinetic parameters
Fillers
Vickers hardness testing
Dental composites
Propane
Kinetic theory
Nylons
Molds
Light sources
Large scale systems
Resins
Hardness
Particle size
Polymerization
Irradiation

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

Cite this

A study of localized curing of glass-filled composites using microhardness measurements. / Abedian, B.; Garcia-Godoy, Franklin; Garcia-Godoy, F.

In: Journal of Applied Polymer Science, Vol. 97, No. 1, 05.07.2005, p. 426-431.

Research output: Contribution to journalArticle

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