Abstract
The present study concerns the trial production of visible light cured denture base resin using cyclophosphazene monomers with a hydrophobic group and a polymerizing group to improve the mechanical properties and lower water sorption.The experimental materials consisted of cyclophosphazene monomer, P4N4(CF3CH2O)2[CH2=C(CH3)COO(CH2)2O]6[4PN-(TF)2-(EMA)6] and 2, 2-Bis[4-(methacryloxy polyethoxy)phenyl]propane[BPE 200]six kinds of monomer compositions were prepared, by changing the mixing ratios of 4PN-(TF)2-(EMA)6 and BPE 200 monomers, from 10〜35wt% and 0〜25wt% respectively.Among the 6 visible light cured denture base resins, the composition with preferable mechanical properties and comparatively low water sorption was PMMA and R972, respectively 55 and 10%, to which 20% 4PN-(TF)2-(EMA)6 monomer and 15% BPE 200 monomer were mixed. This composition had transverse strength, of 820kg/cm2, elastic modulus of 3.2×104kg/cm2, and transverse deflection at 15→35 and 15→50N, 0.9 and 1.6mm, respectively. Its hardness was HRS68, water sorption 24.8, solubility 1.1μg/mm3, and contact angle 71%.
