Evaluation of glass transition temperature and dynamic mechanical properties of autopolymerized hard direct denture reline resins
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- TAKASE Kazuma
- Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Nagasaki University
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- WATANABE Ikuya
- Department of Dental and Biomedical Materials Science, Graduate School of Biomedical Sciences, Nagasaki University
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- KUROGI Tadafumi
- Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Nagasaki University
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- MURATA Hiroshi
- Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Nagasaki University
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Abstract
This study assessed methods for evaluation of glass transition temperature (Tg) of autopolymerized hard direct denture reline resins using dynamic mechanical analysis and differential scanning calorimetry in addition to the dynamic mechanical properties. The Tg values of 3 different reline resins were determined using a dynamic viscoelastometer and differential scanning calorimeter, and rheological parameters were also determined. Although all materials exhibited higher storage modulus and loss modulus values, and a lower loss tangent at 37˚C with a higher frequency, the frequency dependence was not large. Tg values obtained by dynamic mechanical analysis were higher than those by differential scanning calorimetry and higher frequency led to higher Tg, while more stable Tg values were also obtained by that method. These results suggest that dynamic mechanical analysis is more advantageous for characterization of autopolymerized hard direct denture reline resins than differential scanning calorimetry.
Journal
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- Dental Materials Journal
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Dental Materials Journal 34 (2), 211-218, 2015
The Japanese Society for Dental Materials and Devices