Reduction of polymerization contraction stress for dental composites by two-step light-activation

B. S. Lim, Jack Ferracane, Ronald Sakaguchi, J. R. Condon

Research output: Contribution to journalArticle

209 Citations (Scopus)

Abstract

Objectives: The goal of this study was to assess the reduction of polymerization contraction stress of composites during a two-step light-activation process and to relate this reduction to the process of polymerization shrinkage and specimen thickness. Methods: Three test procedures were performed to compare two-step light-activation with delay with one-step continuous irradiation of composites: polymerization contraction stress using a closed-loop servohydraulic testing instrument, polymerization shrinkage by a mercury dilatometer, and degree of conversion by FTIR. For the one-step continuous curing method, the samples were light-activated for 60s at 330mW/cm2. For the two-step curing method, a 5s light exposure at 60mW/cm2 was followed by 2min without light exposure, and then a second light exposure for 60s at 330mW/cm2. The same light parameters were used for measurements of stress, shrinkage, and degree of conversion. Three composites, Heliomolar, Herculite and Z100 were evaluated. The contraction stress experiments were repeated with varying thickness for Herculite using the one-step and two different two-step techniques. Results: Polymerization contraction stress 10min after light-activation was significantly reduced (P

Original languageEnglish (US)
Pages (from-to)436-444
Number of pages9
JournalDental Materials
Volume18
Issue number6
DOIs
StatePublished - Sep 2002

Fingerprint

Dental composites
Polymerization
Tooth
Chemical activation
Light
Curing
Composite materials
Instrument testing
Dilatometers
Fourier Transform Infrared Spectroscopy
Mercury
Irradiation

Keywords

  • Dental composite
  • Polymerization contraction stress
  • Shrinkage
  • Two-step light-activation

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Reduction of polymerization contraction stress for dental composites by two-step light-activation. / Lim, B. S.; Ferracane, Jack; Sakaguchi, Ronald; Condon, J. R.

In: Dental Materials, Vol. 18, No. 6, 09.2002, p. 436-444.

Research output: Contribution to journalArticle

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