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Ethoxylated Bisphenol Dimethacrylate-Based Amorphous Calcium Phosphate Composites



Drago Skrtic, Joseph M. Antonucci, D W. Liu


Improving the anti-demineralizing/remineralizing and mechanical properties of amorphous calcium phosphate composites has been the focus of our recent research. In this study an ethoxylated bisphenol A dimethacrylate (EBPADMA) was blended with triethylene glycol dimethacrylate (TEGDMA), 2-hydroxyethyl methacrylate (HEMA) and methacryloxyethyl phthalate (MEP) to form three experimental resins. The resins were formulated to have 3 different EBPADMA/TEGDMA molar ratios (0.50, 0.85 and 1.35) and a constant HEMA/MEP molar ratio (8.26 0.33). The resins were photo-activated for visible light polymerization and composites were prepared by admixture of either unmilled or milled zirconia-ACP filer (mass fraction 40 %). One aim of the study was to test if improved ion release can be achieved by elevating the EBPADMA/TEGDMA ratio while lowering the level of surface active MEP in the resin without adversely affecting the strength (BFS), degree of vinyl conversion (DC) and water sorption (WS) of composites.A second aim was to assess the effect of using milled vs. unmilled ACP on these properties of the various composites. Both copolymers and composites were assessed for the BFS, DC and WS, and the composites were evaluated for the mineral ion release as well. Overall ion release of all composites was, significantly above the theoretical minimum necessary for remineralization and Ca release was not impeded by Ca binding with the carboxylic acid groups of MEP. Increased supersaturation was attained with increasing EBPADMA/TEGDMA ratio in the resin. Variations in resin composition had no effect on the BFS or DC of composites. The BFS values of the milled ACP composites were higher than the BFS values of unmilled ACP composites (56 % and 79 %, respectively for dry and wet specimens).
Acta Biomaterialia


amorphous calcium phosphate, biaxial flexure strength, degree of vinyl conversion, mineral ion release, water sorption


Skrtic, D. , Antonucci, J. and Liu, D. (2006), Ethoxylated Bisphenol Dimethacrylate-Based Amorphous Calcium Phosphate Composites, Acta Biomaterialia, [online], (Accessed April 16, 2024)
Created January 1, 2006, Updated February 17, 2017