Abstract
To improve the properties of dental resin, three kinds of urethane dimethacrylates (UDMA) with different atomic groups and different numbers of single bonds between the vinyl groups, were synthesized. The effects of the types of atomic group of the skeleton in the UDMA molecule on the properties of its polymer were investigated. Our finding showed that the physical and mechanical properties of the polymer were strongly dependent on the number of single bonds between the vinyl groups located at both the terminal end and the atomic group of the skeleton in the UDMA molecule. Thus, the addition of UDMA comprised of the cyclohexane to TEGDMA increased the elastic modulus and the Knoop hardness. Furthermore, the addition of UDMA containing the ethyleneglycol to TEGDMA increased the deflection, and decreased the flexural strength.
