Dental Pulp Protection to Composite Resin Restoration

Research Project

Project/Area Number	60570896
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	Conservative dentistry
Research Institution	Tokyo Dental College
Principal Investigator	ISHIKAWA Tastuya (1986) Dept. of Operative Dentistry, Tokyo Dental College, 歯学部, 教授 (30085708) 石川達也 (1985) 東京歯科大学, 歯学部, 教授
Co-Investigator(Kenkyū-buntansha)	OGUSHI Takashi Dept. of Oparative Dentistry, Tokyo Dental College, 保存第三講座, 講師 (20085856)
Project Period (FY)	1985 – 1986
Project Status	Completed (Fiscal Year 1986)
Budget Amount *help	¥900,000 (Direct Cost: ¥900,000) Fiscal Year 1986: ¥300,000 (Direct Cost: ¥300,000) Fiscal Year 1985: ¥600,000 (Direct Cost: ¥600,000)
Keywords	Composite resin / Unusual polymerization on resin / 歯髄保護法
Research Abstract	It's necessary to protect pulp damage with effective lining material for composite resin restoration, and to eliminate unusual reaction caused between resin and lining matelials. Part 1. Reaction between each five lining material and composite resin are surveyed through SEM. Glass ionomer cement(Fuji Ionomer), calboxylate cement(Liv cenera) and <alpha> -TCP(Test material) did not affect on resin surface, however, zinc oxide eugenol cement(Neodyne- <alpha> ) and solid type calcium hydroxide(Dycal) caused unusual polymerization along superficial zone of resin. Part 2. A light cured composite resin was filled on the lining material Liv cenera with 31 human experimental teeth. These cases were observed during 3 months, then extracted. Pathological specimens were prepared and studied through microscope. Percussion discomfort was observed in 3 cases(10%). Pathological damages were slight or mild, and results were almost good. Another clinical test using a lining test material <alpha> -TCP were conducted. Two cases out of 40 caused hypersensitivity to the cold and other cases were normal.