A dynamic light scattering approach for monitoring dental composite curing kinetics

Elaine M. Wells-Gray, Sean J. Kirkpatrick, Ronald Sakaguchi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Objectives: The purpose of this studywas to develop and evaluate a dynamic light scatteringbased method for monitoring the polymerization reaction of a light activated dental composite. Methods: Laser light back-scattered from thin disk-shaped composite samples was used to study the curing reaction kinetics. Samples were irradiated simultaneously on opposite surfaces with a 633nm laser beam and a halogen curing lamp (320, 160, or 100mW/cm 2). Dynamic laser speckle patterns were imaged onto a CCD camera at a rate of 32 frames/s for 2 min. The intensity decorrelation rate calculated from sequential speckle patterns was used to assess the rate of motion within the samples during the reaction. Results: Motion within the composite increased immediately upon the onset of light exposure for all trials. This was followed by a brief period characterized by a relatively constant high rate of motion. Finally the rate of motion decreased exponentially. The reaction acceleration, deceleration, and maximum rate were dependent upon the irradiance of the curing light source. Significance: This method monitors reaction rate and the change in reaction rate at high temporal resolution without contact. Reaction kinetics was shown to begin immediately after light exposure suggesting limited opportunity for viscous flow and stress relief.

Original languageEnglish (US)
Pages (from-to)634-642
Number of pages9
JournalDental Materials
Volume26
Issue number7
DOIs
StatePublished - Jul 2010

Fingerprint

Dental composites
Dynamic light scattering
Curing
Tooth
Light
Kinetics
Monitoring
Speckle
Lasers
Reaction kinetics
Reaction rates
Stress relief
Halogens
Deceleration
Composite materials
Viscous flow
CCD cameras
Electric lamps
Laser beams
Light sources

Keywords

  • Composite
  • Dental Material
  • Dynamic light scattering
  • Kinetics
  • Laser speckle
  • Photo-polymerization

ASJC Scopus subject areas

  • Dentistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Medicine(all)

Cite this

A dynamic light scattering approach for monitoring dental composite curing kinetics. / Wells-Gray, Elaine M.; Kirkpatrick, Sean J.; Sakaguchi, Ronald.

In: Dental Materials, Vol. 26, No. 7, 07.2010, p. 634-642.

Research output: Contribution to journalArticle

Wells-Gray, Elaine M. ; Kirkpatrick, Sean J. ; Sakaguchi, Ronald. / A dynamic light scattering approach for monitoring dental composite curing kinetics. In: Dental Materials. 2010 ; Vol. 26, No. 7. pp. 634-642.
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