Competitive light absorbers in photoactive dental resin-based materials.

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@article{1621ccace4d341be997a5da27dfdde0f,
title = "Competitive light absorbers in photoactive dental resin-based materials.",
abstract = "OBJECTIVES: The absorbance profile of photoinitiators prior to, during and following polymerization of light curable resin-based materials will have a significant effect on the cure and color properties of the final material. So-called {"}colorless{"} photoinitiators are used in some light-activated resin-based composite restorative materials to lessen the yellowing effect of camphoroquinone (CQ) in order to improve the esthetic quality of dental restorations. This work characterizes absorption properties of commonly used photoinitiators, an acylphosphine oxide (TPO) and CQ, and assesses their influence on material discoloration. METHODS: Dimethacrylate resin formulations contained low (0.0134mol/dm(3)), intermediate (0.0405mol/dm(3)) or high (0.0678mol/dm(3)) concentrations of the photoinitiators and the inhibitor, butylated hydroxytoluene (BHT) at 0, 0.1 or 0.2% by mass. Disc shaped specimens (n=3) of each resin were polymerized for 60s using a halogen light curing unit. Dynamic measurements of photoinitiator absorption, polymer conversion and reaction temperature were performed. A spectrophotometer was used to measure the color change before and after cure. RESULTS: GLM three-way analysis of variance revealed significant differences (pphotoinitiator type (df=1; F=176.12)>% BHT (df=2, F=13.17). BHT concentration affected the rate of polymerization and produced lower conversion in some of the CQ-based resins. Significant differences between photoinitiator type and concentrations were seen in color (where TPO resins became yellower and camphoroquinone resins became less yellow upon irradiation). Reaction temperature, kinetics and conversion also differed significantly for both initiators (p",
author = "Mohammed Hadis and Adrian Shortall and William Palin",
year = "2012",
month = may,
day = "11",
doi = "10.1016/j.dental.2012.04.029",
language = "English",
journal = "Dental Materials",
issn = "0109-5641",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Competitive light absorbers in photoactive dental resin-based materials.

AU - Hadis, Mohammed

AU - Shortall, Adrian

AU - Palin, William

PY - 2012/5/11

Y1 - 2012/5/11

N2 - OBJECTIVES: The absorbance profile of photoinitiators prior to, during and following polymerization of light curable resin-based materials will have a significant effect on the cure and color properties of the final material. So-called "colorless" photoinitiators are used in some light-activated resin-based composite restorative materials to lessen the yellowing effect of camphoroquinone (CQ) in order to improve the esthetic quality of dental restorations. This work characterizes absorption properties of commonly used photoinitiators, an acylphosphine oxide (TPO) and CQ, and assesses their influence on material discoloration. METHODS: Dimethacrylate resin formulations contained low (0.0134mol/dm(3)), intermediate (0.0405mol/dm(3)) or high (0.0678mol/dm(3)) concentrations of the photoinitiators and the inhibitor, butylated hydroxytoluene (BHT) at 0, 0.1 or 0.2% by mass. Disc shaped specimens (n=3) of each resin were polymerized for 60s using a halogen light curing unit. Dynamic measurements of photoinitiator absorption, polymer conversion and reaction temperature were performed. A spectrophotometer was used to measure the color change before and after cure. RESULTS: GLM three-way analysis of variance revealed significant differences (pphotoinitiator type (df=1; F=176.12)>% BHT (df=2, F=13.17). BHT concentration affected the rate of polymerization and produced lower conversion in some of the CQ-based resins. Significant differences between photoinitiator type and concentrations were seen in color (where TPO resins became yellower and camphoroquinone resins became less yellow upon irradiation). Reaction temperature, kinetics and conversion also differed significantly for both initiators (p

AB - OBJECTIVES: The absorbance profile of photoinitiators prior to, during and following polymerization of light curable resin-based materials will have a significant effect on the cure and color properties of the final material. So-called "colorless" photoinitiators are used in some light-activated resin-based composite restorative materials to lessen the yellowing effect of camphoroquinone (CQ) in order to improve the esthetic quality of dental restorations. This work characterizes absorption properties of commonly used photoinitiators, an acylphosphine oxide (TPO) and CQ, and assesses their influence on material discoloration. METHODS: Dimethacrylate resin formulations contained low (0.0134mol/dm(3)), intermediate (0.0405mol/dm(3)) or high (0.0678mol/dm(3)) concentrations of the photoinitiators and the inhibitor, butylated hydroxytoluene (BHT) at 0, 0.1 or 0.2% by mass. Disc shaped specimens (n=3) of each resin were polymerized for 60s using a halogen light curing unit. Dynamic measurements of photoinitiator absorption, polymer conversion and reaction temperature were performed. A spectrophotometer was used to measure the color change before and after cure. RESULTS: GLM three-way analysis of variance revealed significant differences (pphotoinitiator type (df=1; F=176.12)>% BHT (df=2, F=13.17). BHT concentration affected the rate of polymerization and produced lower conversion in some of the CQ-based resins. Significant differences between photoinitiator type and concentrations were seen in color (where TPO resins became yellower and camphoroquinone resins became less yellow upon irradiation). Reaction temperature, kinetics and conversion also differed significantly for both initiators (p

U2 - 10.1016/j.dental.2012.04.029

DO - 10.1016/j.dental.2012.04.029

M3 - Article

C2 - 22578661

JO - Dental Materials

JF - Dental Materials

SN - 0109-5641

ER -