Influence of photoinitiator type on the rate of polymerization, degree of conversion, hardness and yellowing of dental resin composites

Luis Felipe J Schneider, Carmem Pfeifer, Simonides Consani, Scott A. Prahl, Jack Ferracane

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

Objectives: To evaluate the degree of conversion (DC), maximum rate of polymerization (Rp max), Knoop hardness (KHN) and yellowing (b-value) of resin composites formulated with phenylpropanedione (PPD), camphorquinone (CQ), or CQ/PPD at different concentrations. The hypotheses tested were (i) PPD or CQ/PPD would produce less Rp max and yellowing than CQ alone without affecting DC and KHN, and (ii) Rp max, DC, and KHN would be directly related to the absorbed power density (PDabs). Methods: CQ/amine, PPD/amine and CQ/PPD/amine were used at low, intermediate and high concentrations in experimental composites. Photoinitiator absorption and halogen-light emission were measured using a spectrophotometer, Rp with differential scanning calorimetry (DSC), DC with DSC and FTIR, KHN with Knoop indentation; and color with a chromameter. The results were analyzed with two-way analysis of variance (ANOVA)/Student-Newman-Keul's test (p <0.05). Correlation tests were carried out between PDabs and each of DC, Rp max and KHN. Results: The PDabs increased with photoinitiator concentration and PPD samples had the lowest values. In general, maximum DC was comparable at intermediate concentration, while Rp max and KHN required higher concentrations. DC was similar for all photoinitiators, but Rp max was lower with PPD and CQ/PPD. PPD produced the lowest KHN. Yellowing increased with photoinitiator concentration. PPD did not reduce yellowing at intermediate and/or high concentrations, compared to CQ-formulations. PDabs showed significant correlations with DC, Rp max and KHN. Conclusion: PPD or CQ/PPD reduced Rp max in experimental composites without affecting the DC. The use of PPD did not reduce yellowing, but reduced KHN. DC, Rp max and KHN were dependent on PDabs.

Original languageEnglish (US)
Pages (from-to)1169-1177
Number of pages9
JournalDental Materials
Volume24
Issue number9
DOIs
StatePublished - Sep 2008

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Hardness
Polymerization
Resins
Composite materials
Amines
Differential Scanning Calorimetry
Differential scanning calorimetry
Composite Dental Resin
camphorquinone
Halogens
Composite Resins
Spectrophotometers
Light emission
Fourier Transform Infrared Spectroscopy
Analysis of variance (ANOVA)
Indentation
Analysis of Variance
Color
Students
Light

Keywords

  • Camphorquinone
  • Color
  • Molar extinction coefficient
  • Photoinitiators
  • Photon absorption
  • Polymerization
  • Reaction kinetics
  • Resin composite

ASJC Scopus subject areas

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

Cite this

Influence of photoinitiator type on the rate of polymerization, degree of conversion, hardness and yellowing of dental resin composites. / Schneider, Luis Felipe J; Pfeifer, Carmem; Consani, Simonides; Prahl, Scott A.; Ferracane, Jack.

In: Dental Materials, Vol. 24, No. 9, 09.2008, p. 1169-1177.

Research output: Contribution to journalArticle

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abstract = "Objectives: To evaluate the degree of conversion (DC), maximum rate of polymerization (Rp max), Knoop hardness (KHN) and yellowing (b-value) of resin composites formulated with phenylpropanedione (PPD), camphorquinone (CQ), or CQ/PPD at different concentrations. The hypotheses tested were (i) PPD or CQ/PPD would produce less Rp max and yellowing than CQ alone without affecting DC and KHN, and (ii) Rp max, DC, and KHN would be directly related to the absorbed power density (PDabs). Methods: CQ/amine, PPD/amine and CQ/PPD/amine were used at low, intermediate and high concentrations in experimental composites. Photoinitiator absorption and halogen-light emission were measured using a spectrophotometer, Rp with differential scanning calorimetry (DSC), DC with DSC and FTIR, KHN with Knoop indentation; and color with a chromameter. The results were analyzed with two-way analysis of variance (ANOVA)/Student-Newman-Keul's test (p <0.05). Correlation tests were carried out between PDabs and each of DC, Rp max and KHN. Results: The PDabs increased with photoinitiator concentration and PPD samples had the lowest values. In general, maximum DC was comparable at intermediate concentration, while Rp max and KHN required higher concentrations. DC was similar for all photoinitiators, but Rp max was lower with PPD and CQ/PPD. PPD produced the lowest KHN. Yellowing increased with photoinitiator concentration. PPD did not reduce yellowing at intermediate and/or high concentrations, compared to CQ-formulations. PDabs showed significant correlations with DC, Rp max and KHN. Conclusion: PPD or CQ/PPD reduced Rp max in experimental composites without affecting the DC. The use of PPD did not reduce yellowing, but reduced KHN. DC, Rp max and KHN were dependent on PDabs.",
keywords = "Camphorquinone, Color, Molar extinction coefficient, Photoinitiators, Photon absorption, Polymerization, Reaction kinetics, Resin composite",
author = "Schneider, {Luis Felipe J} and Carmem Pfeifer and Simonides Consani and Prahl, {Scott A.} and Jack Ferracane",
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T1 - Influence of photoinitiator type on the rate of polymerization, degree of conversion, hardness and yellowing of dental resin composites

AU - Schneider, Luis Felipe J

AU - Pfeifer, Carmem

AU - Consani, Simonides

AU - Prahl, Scott A.

AU - Ferracane, Jack

PY - 2008/9

Y1 - 2008/9

N2 - Objectives: To evaluate the degree of conversion (DC), maximum rate of polymerization (Rp max), Knoop hardness (KHN) and yellowing (b-value) of resin composites formulated with phenylpropanedione (PPD), camphorquinone (CQ), or CQ/PPD at different concentrations. The hypotheses tested were (i) PPD or CQ/PPD would produce less Rp max and yellowing than CQ alone without affecting DC and KHN, and (ii) Rp max, DC, and KHN would be directly related to the absorbed power density (PDabs). Methods: CQ/amine, PPD/amine and CQ/PPD/amine were used at low, intermediate and high concentrations in experimental composites. Photoinitiator absorption and halogen-light emission were measured using a spectrophotometer, Rp with differential scanning calorimetry (DSC), DC with DSC and FTIR, KHN with Knoop indentation; and color with a chromameter. The results were analyzed with two-way analysis of variance (ANOVA)/Student-Newman-Keul's test (p <0.05). Correlation tests were carried out between PDabs and each of DC, Rp max and KHN. Results: The PDabs increased with photoinitiator concentration and PPD samples had the lowest values. In general, maximum DC was comparable at intermediate concentration, while Rp max and KHN required higher concentrations. DC was similar for all photoinitiators, but Rp max was lower with PPD and CQ/PPD. PPD produced the lowest KHN. Yellowing increased with photoinitiator concentration. PPD did not reduce yellowing at intermediate and/or high concentrations, compared to CQ-formulations. PDabs showed significant correlations with DC, Rp max and KHN. Conclusion: PPD or CQ/PPD reduced Rp max in experimental composites without affecting the DC. The use of PPD did not reduce yellowing, but reduced KHN. DC, Rp max and KHN were dependent on PDabs.

AB - Objectives: To evaluate the degree of conversion (DC), maximum rate of polymerization (Rp max), Knoop hardness (KHN) and yellowing (b-value) of resin composites formulated with phenylpropanedione (PPD), camphorquinone (CQ), or CQ/PPD at different concentrations. The hypotheses tested were (i) PPD or CQ/PPD would produce less Rp max and yellowing than CQ alone without affecting DC and KHN, and (ii) Rp max, DC, and KHN would be directly related to the absorbed power density (PDabs). Methods: CQ/amine, PPD/amine and CQ/PPD/amine were used at low, intermediate and high concentrations in experimental composites. Photoinitiator absorption and halogen-light emission were measured using a spectrophotometer, Rp with differential scanning calorimetry (DSC), DC with DSC and FTIR, KHN with Knoop indentation; and color with a chromameter. The results were analyzed with two-way analysis of variance (ANOVA)/Student-Newman-Keul's test (p <0.05). Correlation tests were carried out between PDabs and each of DC, Rp max and KHN. Results: The PDabs increased with photoinitiator concentration and PPD samples had the lowest values. In general, maximum DC was comparable at intermediate concentration, while Rp max and KHN required higher concentrations. DC was similar for all photoinitiators, but Rp max was lower with PPD and CQ/PPD. PPD produced the lowest KHN. Yellowing increased with photoinitiator concentration. PPD did not reduce yellowing at intermediate and/or high concentrations, compared to CQ-formulations. PDabs showed significant correlations with DC, Rp max and KHN. Conclusion: PPD or CQ/PPD reduced Rp max in experimental composites without affecting the DC. The use of PPD did not reduce yellowing, but reduced KHN. DC, Rp max and KHN were dependent on PDabs.

KW - Camphorquinone

KW - Color

KW - Molar extinction coefficient

KW - Photoinitiators

KW - Photon absorption

KW - Polymerization

KW - Reaction kinetics

KW - Resin composite

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