Abstract
Spiro ring containing dimethacrylate, 3, 9-bis (1, 1-dimethyl-2-methacryloxyethyl) -2, 4, 8, 10-tetraoxaspiro [5, 5] undecane (SPDMA) was synthesized to improve the mechanical and physical properties of dental acrylic resin. Mechanical strength (compressive strength, elastic modulus and Knoop hardness) and water sorption values were measured on SPDMA copolymers (0-30mol%) with methyl methacrylate, and the relationship between concentration or chemical structure of SPDMA and mechanical properties was investigated. To evaluate the relationship between the chemical structure of various methacrylic monomers and the mechanical properties of the copolymers with MMA, the mechanical properties of two aromatic dimethacrylate and one trimethacrylate copolymers were measured.
Compressive strength, elastic modulus and Knoop hardness of SPDMA copolymers increased with increasing concentration of SPDMA, and were similarr to those of copolymers containing aromatic dimethacrylate. Transverse strength of SPDMA copolymers increased with increase in the concentration of SPDMA.
SPDMA copolymers showed slightly higher water sorption values than those of aromatic dimethacrylate copolymers, but lower values than isocyanuric trimethacrylate copolymers.
