Quantum yield of conversion of the dental photoinitiator camphorquinone

Yin Chu Chen, Jack Ferracane, Scott A. Prahl

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

The primary absorber in dental resins is the photoinitiators, which start the photo polymerization process. We studied the quantum yield of conversion of camphorquinone (CQ), a blue light photoinitiator, using 3M FreeLight LED lamp as the light curing unit. The molar extinction coefficient, ε 469, of CQ was measured to be 46±2 cm -1/(mol/L) at 469 nm. The absorption coefficient change to the radiant exposure was measured at three different irradiances. The relationship between the CQ absorption coefficient and curing lamp radiant exposure was the same for different irradiances and fit an exponential function: μ a469(H) = μ ao exp(-H/H threshold), where μ ao is 4.46±0. 05cm -1, and H threshold=43±4J/cm 2. Combining this exponential relationship with CQ molar extinction coefficient and the absorbed photon energy (i.e., the product of the radiant exposure with the absorption coefficient), we plotted CQ concentration [number of molecules/cm 3] as a function of the accumulated absorbed photons per volume. The slope of the relationship is the quantum yield of the CQ conversion. Therefore, in our formulation (0.7 w% CQ with reducing agents 0.35 w% DMAEMA and 0.05 w% BHT) the quantum yield was solved to be 0.07±0.01 CQ conversion per absorbed photon.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsV.V. Tuchin
Pages256-266
Number of pages11
Volume5771
DOIs
StatePublished - 2005
EventSaratov Fall Meeting 2004: Optical Technologies in Biophysics and Medicine VI - Saratov, Russian Federation
Duration: Sep 21 2004Sep 24 2004

Other

OtherSaratov Fall Meeting 2004: Optical Technologies in Biophysics and Medicine VI
CountryRussian Federation
CitySaratov
Period9/21/049/24/04

Fingerprint

Quantum yield
Light extinction
absorptivity
Photons
curing
Electric lamps
irradiance
luminaires
Curing
photons
extinction
thresholds
Photopolymerization
Exponential functions
exponential functions
Reducing agents
coefficients
resins
Light emitting diodes
absorbers

Keywords

  • Curing efficiency
  • Molar extinction coefficient
  • Photo-cured dental composite

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Chen, Y. C., Ferracane, J., & Prahl, S. A. (2005). Quantum yield of conversion of the dental photoinitiator camphorquinone. In V. V. Tuchin (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 5771, pp. 256-266). [52] https://doi.org/10.1117/12.634627

Quantum yield of conversion of the dental photoinitiator camphorquinone. / Chen, Yin Chu; Ferracane, Jack; Prahl, Scott A.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / V.V. Tuchin. Vol. 5771 2005. p. 256-266 52.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Chen, YC, Ferracane, J & Prahl, SA 2005, Quantum yield of conversion of the dental photoinitiator camphorquinone. in VV Tuchin (ed.), Proceedings of SPIE - The International Society for Optical Engineering. vol. 5771, 52, pp. 256-266, Saratov Fall Meeting 2004: Optical Technologies in Biophysics and Medicine VI, Saratov, Russian Federation, 9/21/04. https://doi.org/10.1117/12.634627
Chen YC, Ferracane J, Prahl SA. Quantum yield of conversion of the dental photoinitiator camphorquinone. In Tuchin VV, editor, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 5771. 2005. p. 256-266. 52 https://doi.org/10.1117/12.634627
Chen, Yin Chu ; Ferracane, Jack ; Prahl, Scott A. / Quantum yield of conversion of the dental photoinitiator camphorquinone. Proceedings of SPIE - The International Society for Optical Engineering. editor / V.V. Tuchin. Vol. 5771 2005. pp. 256-266
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