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Characteristics of Polymeric Dental Restorative Composites Fabricated from Bis-GMA Derivatives Having Low Viscosity  

Jeon, Mi-Young (School of Chemical Engineering and Materials Science, Chung-Ang University)
Song, Jeong-Oh (School of Chemical Engineering and Materials Science, Chung-Ang University)
Kim, Chang-Keun (School of Chemical Engineering and Materials Science, Chung-Ang University)
Publication Information
Polymer(Korea) / v.31, no.6, 2007 , pp. 491-496 More about this Journal
Abstract
In the polymeric dental restorative composites, the resin matrix mainly contains 70 wt% 2,2-bis[4-(2-hydroxy-3-methacryloyloxy propoxy) phenyl] propane (Bis-GMA), as a base resin and 30 wt% triethylene glycol dimethacrylate (TEGDMA) as a diluent. Even though the viscosity of the resin matrix is rapidly decreased by adding TEGDMA, addition of TEGDMA to the Bis-GMA results in reduction in the mechanical properties and increase in the curing shrinkage of the dental composite. In order to fabricate dental composite exhibiting excellent properties by reducing TEGDMA content in the resin matrix, in this study, Bis-GMA derivatives, which do not contain hydroxyl groups, were used instead of Bis-GMA. The curing characteristics of Bis-GMA derivatives were similar with those of Bis-GMA, while the former exhibited lower viscosity and water absorption than the latter. Comparing the curing shrinkage of the dental composite containing Bis-GMA derivative with that prepared from Bis-GMA, the reduction in curing shrinkage was about 25%. Dental composites prepared from new resin matrices also exhibited low water uptake and better properties in mechanical strength.
Keywords
dental composites; Bis-GMA derivatives; viscosity; curing shrinkage; mechanical properties;
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