Projects per year
Abstract
Ojective. The aim of this investigation was to determine reaction enthalpy, ion viscosity and curing light transmission changes of unfilled methacrylate-based systems in order to compare methods that monitor photoactive resin polymerization.
Methods. Photoinitiator (0.2%, w/v, camphoroquinone), accelerator (0.3%, w/v, amine) and inhibitor (ranging from 0 to 1%, w/v, butylated hydroxytoluene, BHT) were incorporated in an experimental BisGMA/TEGDMA co-monomer mixture (50/50, w/v). The concentration of BHT was varied from 0.00, 0.01, 0.05, 0.10, 0.50 to 1.00% (w/v). Light transmission (LT), reaction enthalpy (UV-differential scanning calorimetry, DSC), and ion viscosity (dielectrical analysis, DEA) were determined during irradiation of the resins (40 s; halogen light curing-unit). Statistical analysis was performed using two-way ANOVA followed by post hoc tests (alpha = 0.05). Curve fitting and regression calculation were done.
Results. There was no significant change in the time to reach the maximum rate of polymerization (reaction time) in the individual systems up to a BHT concentration of 0.05% (P > 0.05). Starting at a concentration of 0.10% BHT an increase in time of reaction could be found from 4.0 s (LT), 4.07 s (DEA) and 4.9 s (DSC) to a maximum of 7.4 s (DSC), 9.43 s (DEA) and 9.67 s (LT). Linear increase (y = 5.588 x x) in time to the maximum speed of reaction could be found with a correlation of R-2 = 0.992.
Conclusions. The speed of polymerization reaction is strongly influenced by BHT concentration. The linear relationship should allow for the prediction of the speed of reaction during blending of a methacrylate-based resin. The three test systems allow for monitoring the complex polymerization kinetics of unfilled methacrylate-based systems. (C) 2010 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Original language | English |
---|---|
Pages (from-to) | 565-570 |
Number of pages | 6 |
Journal | Dental Materials |
Volume | 26 |
Issue number | 6 |
DOIs | |
Publication status | Published - 1 Jun 2010 |
Keywords
- DEA
- BHT
- Photoactive resin
- Inhibitor
- Real-time reaction
- Light transmission
- DSC
Fingerprint
Dive into the research topics of 'Dynamic monitoring of curing photoactive resins: A methods comparison'. Together they form a unique fingerprint.Projects
- 1 Finished
-
Dynamic Monitoring of Refractive Index Change Through Light-Activated Dental Fillings
Engineering & Physical Science Research Council
23/03/07 → 22/09/10
Project: Research Councils