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Influence of composition and powder/liquid ratio on setting characteristics and mechanical properties of autopolymerized hard direct denture reline resins based on methyl methacrylate and ethylene glycol dimethacrylate


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Title: Influence of composition and powder/liquid ratio on setting characteristics and mechanical properties of autopolymerized hard direct denture reline resins based on methyl methacrylate and ethylene glycol dimethacrylate
Authors: Okuyama, Yoshikazu / Shiraishi, Takanobu / Yoshida, Kazuhiro / Kurogi, Tadafumi / Watanabe, Ikuya / Murata, Hiroshi
Issue Date: 1-Jul-2014
Publisher: 日本歯科理工学会 / Japanese Society for Dental Materials and Devices
Citation: Dental Materials Journal, 33(4), pp.522-529; 2014
Abstract: We evaluated the influence of composition and powder/liquid (P/L) ratio on the setting characteristics and mechanical properties of autopolymerized hard direct denture reline resins composed of methyl methacrylate (MMA, monomethacrylate) and ethylene glycol dimethacrylate [EGDMA, dimethacrylate (cross-linking agent)], with poly (ethyl methacrylate) used as the powder, and a mixture of MMA and EGDMA containing p-tolyldiethanolamine as the monomer. Setting times were determined using an oscillating rheometer and mechanical properties were based on ISO specifications. Setting time increased exponentially with an increase in the ratio of EGDMA to MMA and decrease in P/L ratio. Materials with a liquid component of approximately 75-85 wt% EGDMA and a higher P/L ratio showed higher ultimate flexural strength and flexural modulus. Our results suggest that setting characteristics are more influenced by the ratio of monomethacrylate and cross-linking agent, whereas mechanical properties are more influenced by P/L ratio.
Keywords: Ethylene glycol dimethacrylate / Mechanical properties / Methyl methacrylate / Reline resin / Setting characteristics
URI: http://hdl.handle.net/10069/34828
ISSN: 02874547
Rights: © 2014 The Japanese Society for Dental Materials and Devices
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/34828

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