[Enhancing the biocompatibility of dentures made from polymethylmethacrylate by using hydroxyapatite]

Twenty or 50 weight-percent of hydroxyapatite (Polystome) was added in suspensions of AKR-15 copolymer and acid monomers, then the mixtures were molded and subjected to thermal treatment. Admixtures (supercritical CO2) were extracted from the composites in parallel with infrared spectroscopic measurement of the concentration of methylmetacrylate toxic monomers. Hydroxyapatite in 20% concentration decreased the release of toxic substances from the composite, whereas 50% concentration of the agent did not produce this effect. Three patients with intolerance of acrylic plastic were effectively treated using this method.