Polymerization shrinkage kinetics of dimethacrylate resin-cements
| Autor: | Thomas Spinell, David C. Watts, Andreas Schedle |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Dental Stress Analysis
Materials science RelyX Unicem Self-Curing of Dental Resins Kinetics Analytical chemistry Dental Bonding Dental bonding Phase Transition Resin Cements Dimethacrylate resin Polymerization Mechanics of Materials Hardness Materials Testing Methacrylates General Materials Science Stress Mechanical Composite material General Dentistry Resin cement Shrinkage Light-Curing of Dental Adhesives |
| Zdroj: | Dental materials : official publication of the Academy of Dental Materials. 25(8) |
| ISSN: | 1879-0097 |
| Popis: | OBJECTIVES: To determine polymerization shrinkage-strain (S(Y)) and shrinkage-stress (S(Z)) of six resin-cements and to compare their performance with the aid of degree of conversion (DC) data. METHODS: Variolink 2 (VL2), Multilink Automix (MA), Multilink Sprint (MS, all Ivoclar-Vivadent), Nexus 2 (NX2), Maxcem (MX, both Kerr) and RelyX Unicem (RX, 3M-Espe) were investigated. MS, MX and RX were self-adhesive; others require a bonding-agent. All measurements were conducted at 23 degrees C for 60min (n=5), except 80min for RX, with materials self-cured only (sc) and dual-cured (dc); NX2 and VL2 were additionally light-cured only (lc). S(Y) was measured by the bonded-disk method [Watts DC, Cash AJ. Determination of polymerization shrinkage kinetics in visible-light-cured materials: methods development. Dent Mater 1991;7(4):281-7; Watts DC, Marouf AS. Optimal specimen geometry in bonded-disk shrinkage-strain measurements on light-cured biomaterials. Dent Mater 2000;16(6):447-51]; S(Z) by the Bioman instrument [Watts DC, Satterthwaite JD. Axial shrinkage-stress depends upon both C-factor and composite mass. Dent Mater 2008;24(1):1-8 [Epub October 24, 2007]; Watts DC, Marouf AS, Al-Hindi AM. Photo-polymerization shrinkage-stress kinetics in resin-composites: methods development. Dent Mater 2003;19(1):1-11]. Light-cure was achieved by QTH at 500mW/cm(2). The respective DCs were measured under the same conditions by FTIR-ATR spectroscopy. Data were analyzed by One-Way ANOVA plus Bonferroni test, and by t-test, at p |
| Databáze: | OpenAIRE |
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