Alternative photoinitiator system reduces the rate of stress development without compromising the final properties of the dental composite

Luis Felipe J Schneider, Simonides Consani, Ronald Sakaguchi, Jack Ferracane

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Objectives: Stress development during the polymerization process continues to be a major factor that limits predictability and longevity of resin composite restorations. This study evaluated the effect of the photoinitiator type on the maximum rate of polymerization (Rp max), stress development (final stress and maximum rate, Rstress max), degree of conversion (DC) and cross-link density (CLD) of materials containing camphorquinone (CQ), phenylpropanedione (PPD) or CQ/PPD. Materials and methods: Rp max was evaluated via differential scanning calorimetry (DSC). Contraction force measurement was assessed with a single cantilever device for 5 min. The samples were subsequently tested by infrared spectroscopy (FTIR) to evaluate the DC. After, samples were soaked in ethanol to evaluate the swelling coefficient (α) as a way to estimate the CLD. The results were analyzed by one-way ANOVA and Tukey's test (p = 0.05). Results: CQ showed the highest Rp max and Rstress max. PPD produced the lowest DC and the highest α. The mixture CQ/PPD produced statistically lower Rp max and Rstress max than CQ alone, but similar DC and CLD. Conclusion: CQ/PPD reduced the Rp max and Rstress max without a reduction in DC and CLD. Therefore, the use of alternative photoinitiator systems could be a promising way to reduce the stress developed during the composite's polymerization without affecting the final properties.

Original languageEnglish (US)
Pages (from-to)566-572
Number of pages7
JournalDental Materials
Volume25
Issue number5
DOIs
StatePublished - May 2009

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Dental composites
Tooth
Polymerization
Force measurement
Composite materials
Analysis of variance (ANOVA)
Restoration
Swelling
Differential scanning calorimetry
Infrared spectroscopy
Ethanol
Resins
Composite Resins
Differential Scanning Calorimetry
Fourier Transform Infrared Spectroscopy
camphorquinone
Spectrum Analysis
Analysis of Variance
Equipment and Supplies

Keywords

  • Composites
  • Degree of conversion
  • Photoinitiators
  • Polymerization stress

ASJC Scopus subject areas

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

Cite this

Alternative photoinitiator system reduces the rate of stress development without compromising the final properties of the dental composite. / Schneider, Luis Felipe J; Consani, Simonides; Sakaguchi, Ronald; Ferracane, Jack.

In: Dental Materials, Vol. 25, No. 5, 05.2009, p. 566-572.

Research output: Contribution to journalArticle

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