Methacrylate Conversion in Photopolymerized Composites Containing Amorphous Calcium Phosphate Fillings
Joseph M. Antonucci, Drago Skrtic, R T. Brunworth
Recently a new class of photocurable composites has been developed that utilize amorphous calcium phosphate (ACP) as the filler phase with photoactivated dental monomer systems such as 2,2-bis[p-(2'-hydroxy-3'-methacryloxypropoxy)phenyl]propane (Bis-GMA), triethylene glycol dimethacrylate (TEGDMA) and 2-hydroxyethyl methacrylate (HEMA) providing the resin matrix binder pahse (1). ACP, a plausible precursor in the formation of biological hydroxyapatite (HAP), has high solubility in aqueous environments and undergoes facile conversion to HAP, thereby making ACP a potential remineralizing agent. ACP-filled composites are envisioned to be bioactive, because they show sustained release of calcium and phosphate ions, and thus are capable of repairing demineralized tooth structures by inducing mineral recovery via HAP deposition. A previous study (1) has shown that certain variations in the chemical structure and composition of the resin phase may affect the rate and extent of the ion release from ACP-filled composites. It has also been found that the use of hybrid ACPs, i.e. those containing silicon (Si) or zirconium (Zr), can yield similar bioactive composites with improved mechanical strength. Although the filler phase and its teachable products are probably biocompatible, there is concern about the biocompatibility of the resin system of these composites. The objective of this study was to evaluate the effects of structural and compositional variations of the resin system on the degree of methacrylate conversion (DC) of AcP composites. Resin compositions that achieve high DCs are expected to exhibit minimal resin leachability. And thereby enhance the biocompatibility of their ACP composites.
August 25-30, 2001
Polymer Materials: Science and Engineering ACS National Meeting
, Skrtic, D.
and Brunworth, R.
Methacrylate Conversion in Photopolymerized Composites Containing Amorphous Calcium Phosphate Fillings, Polymer Materials: Science and Engineering ACS National Meeting, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851881
(Accessed February 23, 2024)