| Curing efficiency of dental resin composites formulated with camphorquinone or trimethylbenzoyl-diphenyl-phosphine oxide. | |
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MedLine Citation:
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PMID: 22188970 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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OBJECTIVES: Since photoinitiator systems for dental resins based on camphorquinone (CQ) present color disadvantages, trimethylbenzoyl-diphenyl-phosphine oxide (TPO) has been proposed as an alternative. However, there are remaining considerations about its curing efficiency. The aims of the present investigation were: to characterize the relationship between the photoinitiator absorption spectra and the light spectrum emitted from a QTH light (absorbed power density, PD(abs)); to evaluate the kinetics of polymerization, and the depth of cure for filled dimethacrylate resins formulated with different photoinitiator systems. METHODS: CQ+EDMAB (control); TPO and TPO+EDMAB were used in 50:50 Bis-GMA/TEGDMA resins. Photoinitiator absorption and QTH-light emission were evaluated using a spectrophotometer and kinetics of polymerization with differential scanning calorimetry (DSC) (n=3). Depth of cure was analyzed by the scraping method (n=5), as recommended by ISO4049. One-way ANOVA/Tukey's (p<0.05) was used to analyze the results. RESULTS: CQ presented higher PD(abs) than TPO (364 and 223mW/cm(3), respectively). The DSC revealed that TPO and TPO+EDMAB produced a faster reaction than CQ+EDMAB. Composite formulated with CQ+EDMAB produced higher depth of cure (6.3±0.4mm) than those with TPO (4.3±0.1) or TPO+EDMAB (4.2±0.3). SIGNIFICANCE: Although CQ presented higher PD(abs) than TPO, formulations containing TPO exhibited higher reactivity than that with CQ. On the other hand, materials formulated with TPO demonstrated lower depth of cure than that with CQ. Therefore, its use as an alternative photoinitiator requires further investigation, with higher concentrations. |
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Authors:
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Luis Felipe J Schneider; Larissa Maria Cavalcante; Scott A Prahl; Carmem S Pfeifer; Jack L Ferracane |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-19 |
Journal Detail:
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Title: Dental materials : official publication of the Academy of Dental Materials Volume: - ISSN: 1879-0097 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-22 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8508040 Medline TA: Dent Mater Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. |
Affiliation:
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LaBiom-R, School of Dentistry, Fluminense Federal University, Niterói, RJ, Brazil; School of Dentistry, Veiga de Almeida University, Rio de Janeiro, RJ, Brazil. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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