Development of the measurement method of the internal micro defects in the dental zirconia ceramics

2014 Fiscal Year Final Research Report

• Project/Area Number: 24659868
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Dental engineering/Regenerative dentistry
• Research Institution: Tokyo Medical and Dental University
• Principal Investigator: UO Motohiro 東京医科歯科大学, 医歯(薬)学総合研究科, 教授 (20242042)
• Co-Investigator(Kenkyū-buntansha): TANAKA Satoshi 長岡技術科学大学, 工学部, 准教授 (20324006) ; WADA Takahiro 東京医科歯科大学, 大学院医歯学総合研究科, 助教 (10632317)
• Research Collaborator: WADA Ken 大学共同利用機関法人, 高エネルギー加速器研究機構・物質構造科学研究所, 特別助教 (10401209)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 歯科材料学 / ジルコニア / 微細構造

Outline of Final Research Achievements

In order to increase the reliability of the zirconia restorations, it is necessary to reveal the relationship between the fracture of zirconia and their internal defect or foreign debris. In this study, the detection method of the internal defect of zirconia in various scales with using the multi probes e.g., X-ray, infrared, and positron. Transmission X-ray image and micro X-ray CT visualized void in sub-milimeter and several ten micrometer scale. Infrared microscope image visualized the micro defects which was assumed as the grain boundary of the zirconia resource particles. Positron annihilation lifetime analysis showed the existence of atomic scale defects. The deference of such defects with the composition and sintering method could not be detected.

Free Research Field

歯科医用工学・再生歯学