[The development of visible light-cured composite resin. Kinds of fillers to be mixed with cyclophosphazene system monomers and its amount and its physical properties].

A visible light-cured composite resin was developed. Cyclophosphazene monomer, 4 PN-(TF)1-(EMA)7 was prepared as a monomer. The ratio of brush abrasion, mechanical properties, water sorption, thermal expansion coefficient and the surface of abrasion were examined after mixing with fillers of different particle size (R-972, OX-50 and VL-30). The ratio of brush abrasion showed a tendency to be small when more than 50 wt% of VL-30 with a large particle size was mixed with 4 PN-(TF)1-(EMA)7 monomer. However its abrasion surface was rough compared with that of the microparticle filler. When the microparticle filler (50 wt% of OX-50) was mixed with the monomer, its mechanical properties were good for the mixture with 50 wt% OX-50. In that case, the ratio of brush abrasion was 0.268, compressive and transverse strength, 124.3 and 86.3 MPa respectively, hardness, 43.2 Hk, water absorption 14.2 micrograms/mm3 and thermal expansion coefficient, 47.4 x 10(-6)/degrees C.