Study on Glass Ionomer Cement using Temperature-response Polymer

1994 Fiscal Year Final Research Report Summary

• Project/Area Number: 05671640
• Research Category: Grant-in-Aid for General Scientific Research (C)
• Allocation Type: Single-year Grants
• Research Field: 補綴理工系歯学
• Research Institution: Kanagawa Dental College
• Principal Investigator: UMEMOTO Kozo Kanagawa Dental College, Department of Dental Materials, Associate professor, 歯学部, 助教授 (40097275)
• Co-Investigator(Kenkyū-buntansha): KURATA Shigeaki Kanagawa Dental College, Department of Chemistry, Lecturer, 歯学部, 講師 (20104333)
• Project Period (FY): 1993 – 1994
• Keywords: Ionomer cement / Mechanical property / Water resistance / Temperature-response polymer

Research Abstract

To diminish the effect of water on the mechanical property- and the adhesion-durability of glass ionomer cement, an experimental cement using temperature-response polymer as the cement liquid was studied. Temperature-response polymers were synthesized by radical polymerization of a variety ratio of N-isopropylacrylamid (NIPAM) and acrylic acid (AA). The cement powder consisted of a fluorin containing aluminosilicate glass. The temperature of phase separation of AA-NIPAM copolymer decreased with an increasing amount of AA in the range of 0 to 40 mol% in the copolymer, and increased with an increasing amount of AA in the range of 40 to 70 mol%. The bond strengths of the cement prepared from the AA-NIPAM copolymer containing 70 mol% AA superior to that of the cement prepared from poly (acrylic acid) (PAA) as ordinary cement liquid. The compressive strength of the AA-NIPAM cement dcreased slightly compared with that of PAA cement, but the bond strength increased with an increasing amount of AA.