Development of a new photoinitiation system for dental light-cure composite resins

Y. J. Park, K. H. Chae, Henry R Rawls

Research output: Contribution to journalArticle

160 Citations (Scopus)

Abstract

Objectives: The purpose of this study is to explore the synergistic effect of combining camphorquinone (CQ) with 1-phenyl-1,2-propanedione (PPD) as a new photoinitiator. Methods: A BisGMA, UDMA, TEGDMA monomer mixture was made light-curing with CQ and/or PPD plus 0.2 wt.% N,N-cyanoethylmethylaniline (CEMA). Seventeen groups, three specimens each, were tested in which the concentrations of PPD and CQ were varied. The effect of photosensitizer type (CQ or PPD) and ratio (PPD/CQ) on degree of conversion (DC) was investigated using FTIR spectrophotometry. The results were analyzed by ANOVA and Student-Newman-Keuls' multiple range comparison. The absorption spectra of PPD and CQ were recorded by UV-Vis spectrophotometry. A blind color comparison of specimens containing combinations of the two photosensitizers was also undertaken. Results: Alone, PPD induces a DC which is not significantly different from that of CQ alone. In combination, CQ + PPD produces a DC that generally exceeds that produced by the same concentration of either used alone. The maximum DC occurs between PPD/CQ = 1:1 and 1:4. At total photosensitizer concentrations above 1.8 wt.%, DC is increased by PPD but depressed by CQ, which is evidence that different mechanisms are involved. PPD (λmax ≈ 410 nm) and CQ (λmax ≈ 468 nm) have different wavelength absorption ranges, resulting in a perceptibly lighter shade of yellow for PPD. Significance: 1-phenyl-1,2-propanedione is a photosensitizer of potential value in reducing color problems associated with visible light cured dental resins. In combination with camphorquinone, it acts synergistically to produce a more efficient photoinitiation reaction.

Original languageEnglish (US)
Pages (from-to)120-127
Number of pages8
JournalDental Materials
Volume15
Issue number2
StatePublished - Mar 1999

Fingerprint

Photosensitizers
Composite Resins
Tooth
Resins
Light
Composite materials
Spectrophotometry
Photosensitizing Agents
Color
Analysis of variance (ANOVA)
Curing
Absorption spectra
Monomers
Students
Wavelength
camphorquinone
Synthetic Resins
Fourier Transform Infrared Spectroscopy
Analysis of Variance

Keywords

  • 1-phenyl-1,2-propanedione
  • Camphorquinone
  • Photopolymerization

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Development of a new photoinitiation system for dental light-cure composite resins. / Park, Y. J.; Chae, K. H.; Rawls, Henry R.

In: Dental Materials, Vol. 15, No. 2, 03.1999, p. 120-127.

Research output: Contribution to journalArticle

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