Quantum yield of conversion of the photoinitiator camphorquinone

Yin Chu Chen, Jack Ferracane, Scott A. Prahl

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

The primary absorber in dental resins is the photoinitiator, which starts the photo polymerization process. We studied the quantum yield of conversion of camphorquinone (CQ), a blue light photoinitiator, in dental resin composites using a LED lamp (3M FreeLight) and a Quartz Tungsten Halogen (QTH) lamp (VIP) as the light curing units at five different irradiances. The molar extinction coefficient, ε469, of CQ was 46 ± 2 cm-1/(mol/L) at 469 nm. The reciprocity of irradiance and exposure time holds for changes of CQ absorption coefficient, that is, irradiance × exposure time (=radiant exposure) = constant. Both LED and QTH lamps yielded the same curing threshold (the radiant exposure when CQ absorption drops to 1/e) and the same quantum yield conversion under different irradiances. In our dental resin formulation (0.7 wt.% CQ with reducing agents 0.35 wt.% dimethylaminoethyl methacrylate (DMAEMA) and 0.05 wt.% butylated hydroxytoluene (BHT)) the quantum yield was measured as 0.07 ± 0.01 CQ conversion per absorbed photon.

Original languageEnglish (US)
Pages (from-to)655-664
Number of pages10
JournalDental Materials
Volume23
Issue number6
DOIs
StatePublished - Jun 2007

Fingerprint

Quantum yield
Electric lamps
Resins
Dental Photoinitiators
Light emitting diodes
Tungsten
Curing
Quartz
Synthetic Resins
Halogens
Photopolymerization
Reducing agents
Photons
Light
Butylated Hydroxytoluene
Methacrylates
Reducing Agents
Composite materials
Polymerization
camphorquinone

Keywords

  • Curing threshold
  • Dynamic absorption coefficient
  • Light-activated polymerization
  • Molar extinction coefficient
  • Radiant exposure
  • Reciprocity

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

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

In: Dental Materials, Vol. 23, No. 6, 06.2007, p. 655-664.

Research output: Contribution to journalArticle

Chen, Yin Chu ; Ferracane, Jack ; Prahl, Scott A. / Quantum yield of conversion of the photoinitiator camphorquinone. In: Dental Materials. 2007 ; Vol. 23, No. 6. pp. 655-664.
@article{e2f7db0ad9364f1f82a7c2757f3a9a93,
title = "Quantum yield of conversion of the photoinitiator camphorquinone",
abstract = "The primary absorber in dental resins is the photoinitiator, which starts the photo polymerization process. We studied the quantum yield of conversion of camphorquinone (CQ), a blue light photoinitiator, in dental resin composites using a LED lamp (3M FreeLight) and a Quartz Tungsten Halogen (QTH) lamp (VIP) as the light curing units at five different irradiances. The molar extinction coefficient, ε469, of CQ was 46 ± 2 cm-1/(mol/L) at 469 nm. The reciprocity of irradiance and exposure time holds for changes of CQ absorption coefficient, that is, irradiance × exposure time (=radiant exposure) = constant. Both LED and QTH lamps yielded the same curing threshold (the radiant exposure when CQ absorption drops to 1/e) and the same quantum yield conversion under different irradiances. In our dental resin formulation (0.7 wt.{\%} CQ with reducing agents 0.35 wt.{\%} dimethylaminoethyl methacrylate (DMAEMA) and 0.05 wt.{\%} butylated hydroxytoluene (BHT)) the quantum yield was measured as 0.07 ± 0.01 CQ conversion per absorbed photon.",
keywords = "Curing threshold, Dynamic absorption coefficient, Light-activated polymerization, Molar extinction coefficient, Radiant exposure, Reciprocity",
author = "Chen, {Yin Chu} and Jack Ferracane and Prahl, {Scott A.}",
year = "2007",
month = "6",
doi = "10.1016/j.dental.2006.06.005",
language = "English (US)",
volume = "23",
pages = "655--664",
journal = "Dental Materials",
issn = "0109-5641",
publisher = "Elsevier Science",
number = "6",

}

TY - JOUR

T1 - Quantum yield of conversion of the photoinitiator camphorquinone

AU - Chen, Yin Chu

AU - Ferracane, Jack

AU - Prahl, Scott A.

PY - 2007/6

Y1 - 2007/6

N2 - The primary absorber in dental resins is the photoinitiator, which starts the photo polymerization process. We studied the quantum yield of conversion of camphorquinone (CQ), a blue light photoinitiator, in dental resin composites using a LED lamp (3M FreeLight) and a Quartz Tungsten Halogen (QTH) lamp (VIP) as the light curing units at five different irradiances. The molar extinction coefficient, ε469, of CQ was 46 ± 2 cm-1/(mol/L) at 469 nm. The reciprocity of irradiance and exposure time holds for changes of CQ absorption coefficient, that is, irradiance × exposure time (=radiant exposure) = constant. Both LED and QTH lamps yielded the same curing threshold (the radiant exposure when CQ absorption drops to 1/e) and the same quantum yield conversion under different irradiances. In our dental resin formulation (0.7 wt.% CQ with reducing agents 0.35 wt.% dimethylaminoethyl methacrylate (DMAEMA) and 0.05 wt.% butylated hydroxytoluene (BHT)) the quantum yield was measured as 0.07 ± 0.01 CQ conversion per absorbed photon.

AB - The primary absorber in dental resins is the photoinitiator, which starts the photo polymerization process. We studied the quantum yield of conversion of camphorquinone (CQ), a blue light photoinitiator, in dental resin composites using a LED lamp (3M FreeLight) and a Quartz Tungsten Halogen (QTH) lamp (VIP) as the light curing units at five different irradiances. The molar extinction coefficient, ε469, of CQ was 46 ± 2 cm-1/(mol/L) at 469 nm. The reciprocity of irradiance and exposure time holds for changes of CQ absorption coefficient, that is, irradiance × exposure time (=radiant exposure) = constant. Both LED and QTH lamps yielded the same curing threshold (the radiant exposure when CQ absorption drops to 1/e) and the same quantum yield conversion under different irradiances. In our dental resin formulation (0.7 wt.% CQ with reducing agents 0.35 wt.% dimethylaminoethyl methacrylate (DMAEMA) and 0.05 wt.% butylated hydroxytoluene (BHT)) the quantum yield was measured as 0.07 ± 0.01 CQ conversion per absorbed photon.

KW - Curing threshold

KW - Dynamic absorption coefficient

KW - Light-activated polymerization

KW - Molar extinction coefficient

KW - Radiant exposure

KW - Reciprocity

UR - http://www.scopus.com/inward/record.url?scp=34247098480&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34247098480&partnerID=8YFLogxK

U2 - 10.1016/j.dental.2006.06.005

DO - 10.1016/j.dental.2006.06.005

M3 - Article

VL - 23

SP - 655

EP - 664

JO - Dental Materials

JF - Dental Materials

SN - 0109-5641

IS - 6

ER -