Abstract
To develop fluoride-releasing dental materials, three kinds of fluoride-releasing phosphazene monomers were synthesized and analyzed.Using hexafluorocyclotriphosphazene(P_3N_3F_6), three kinds of P_3N_3(F)_<1-3>(EMA)_<5-3> were synthesized by replacing 3〜5 of fluoride with HEMA.On IR, NMR and elemental analysis, all synthesized monomers were within expectation.Their refractive index were 1.4662〜1.4718 and viscosity were 1.3〜1.8Pa・s.Then, 30wt% of synthesized monomers were mixed with MMA and light-cured.Polymers were produced by mixing with PMMA.Amounts of fluoride released and the transverse strength were measured after a period of immersion in water at 37℃.Amounts of fluoride released by the three kinds of polymers were decreased with changes in the immersion period.After 1 day and 360 days immersion in water, amounts of floride released were 2.0〜3.3μg/ml and 0.2〜0.8μg/ml respectively.Transverse strength after 360 days immersion in water was 74.0〜76.0MPa.Amounts of fluoride released and transverse strength showed a tendency to decrease with increases in the immersion period when commercial sealant was used as a control.
