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Type: Artigo de periódico
Title: Dynamic mechanical thermal analysis of composite resins with CQ and PPD as photo-initiators photoactivated by QTH and LED units
Author: Brandt, WC
Silva, CG
Frollini, E
Souza, EJC
Sinhoreti, MAC
Abstract: Objectives: The aim of this study was to evaluate the thermal and mechanical properties of the composite resins containing the photo-initiators camphorquinone (CQ) and/or phenylpropanodione (PPD) when photoactivated with halogen lamp (XL2500/3M-ESPE), monowave (UltraBlueIS/DMC) and polywave (UltraLume5/Ultradent) LED units. Materials and methods: A blend of BisGMA, UDMA, BisEMA and TEGDMA was prepared with the same wt% of photo-initiators CQ and/or PPD and 65 wt% of silaneted filler particles. Compression strength (CS), diametral tensile strength (DTS) and diametral modulus (DM) were tested. Thermogravimetric analysis (TGA) was made and the lost residual monomer were verified. Dynamic mechanical thermal analysis (DMTA) was used for to analyze the glass transition temperature (Tg) and the storage modulus in 37 degrees C. Degree of conversion (DC) was accomplished in the same samples of DMA using middle-infrared spectroscopy (mid-IR). Results: CQ CQ/PPD and PPD obtained the same results for all mechanical properties (CS, DTS and DM), lost residual monomer and storage modulus in 37 degrees C, regardless LCU used. The results of Tg showed that the combination PPD-UltraLume5 produced the highest values. DC showed that the combination CQ-UltraLume5 resulted in the highest values and PPD-XL2500 in the lowest DC values. Conclusion:. The study shows that PPD is not only effective photosensitizers, but also photocrosslinking agents for dental composite resins with a similar efficiency to CQ. (C) 2013 Elsevier Ltd. All rights reserved.
Subject: Photo-initiator
Dental resins and composites
Cross-link density
Glass transition temperature
Country: Holanda
Editor: Elsevier Science Bv
Citation: Journal Of The Mechanical Behavior Of Biomedical Materials. Elsevier Science Bv, v. 24, n. 21, n. 29, 2013.
Rights: fechado
Identifier DOI: 10.1016/j.jmbbm.2013.04.010
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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