1997 Fiscal Year Final Research Report Summary

DEVELOPMENT OF DENTAL PORCELAIN MATERIAL PRODUCED UNDER MILD CONDITION OF LOW TEMPERATURE AND PRESSURE

Research Project

Project/Area Number	08672260
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	補綴理工系歯学
Research Institution	KANAGAWA DENTAL COLLEGE
Principal Investigator	UMEMOTO Kozo KANAGAWA DENTAL COLLEGE,DEPARTMENT OF DENTISTRY,ASSISTANT PROFESSOR, 歯学部, 助教授 (40097275)
Co-Investigator(Kenkyū-buntansha)	KURATA Shigeaki KANAGAWA DENTAL COLLEGE,DEPARTMENT OF DENTISTRY,LECTURER, 歯学部, 講師 (20104333)
Project Period (FY)	1996 – 1997
Keywords	Low Temperature / Pressure / Toughness / Ceramics / Whisker
Research Abstract	The heating temperature of a mixture of magnesia and ammonium dihydrogenphosphate as setting materials and porcelain powder as core is 700ﾟC,the temperature was lower than the fusing temperature of the porcelain powder using this study. Furthermore, it was suggested that addition of whisker of 10-20 mum in length and 0.3-1.0 mum in diameter was very useful for improvement of bending strength of the ceramics prepared. The bending strength of the ceramics consisted of porcelain powder treated with zirconia solution (ZP) containing 2 or 4 wt% potassium titanate (PT) whisker showed excellently high. Addition of PT whisker did not affect on the wear-resistance of ZP ceramics. The surface roughness of ZP ceramics containing PT whisker increased slightly. While, the fitness of the inlay formed from this material was poor.