| Project/Area Number |
17592022
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
補綴理工系歯学
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| Research Institution | Osaka University |
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Principal Investigator |
NAKAMURA Takashi Osaka University, Graduate School of Dentsitry, Associate Professor (20198211)
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| Co-Investigator(Kenkyū-buntansha) |
YATANI Hirofumi Osaka University, Graduate School of Dentsitry, Professor (80174530)
FURUKAWA Souhei Osaka University, Graduate School of Dentsitry, Professor (80173524)
SOUMURA Taiji Osaka University, Graduate School of Dentsitry, Professor (10154692)
KINUTA Souichiro Osaka University, Resident (60397651)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2005: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Micro-focus X-ray Computed Tomography / Non-destructive and three-dimensional analysis / Internal defect / Fitness / Dental prosthesis / 三次元 / 非破壊 / メタルフリークラウン |
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| Research Abstract |
The aim of this study is to evaluate the internal adaptation and defects of dental prosthesis non-destructively and three-dimensionally using micro-focus x-ray computed tomography.
At first, the internal adaptation of three kind of all-ceramic crown, Angel Crown(Media), Procera Allceram(Nobel Biocare), IPS Empress(Ivoclar Vivadent) was measured and analyzed. As a result, 1) The standard deviation of internal gap of Angel crown was lower than the other all-ceramic crowns and it had stable adaptation. 2)Procera Allceram crowns had the homogeneous gaps except margins. 3)IPS-Empress crowns had the best adaptation than the CAD/CAM crowns. It revealed that CAD/CAM all-ceramic crown had the stable adaptation of CAD/CAM all-ceramic crown was revealed nondestructively and three-dimensionally using micro-focus x-ray CT.
Next, the internal defects of three kinds of all-ceramic crown except Estenia crown was analyzed. As a result, it was recognized that the numbers of internal defects of CAD/CAM crowns are very few and It was revealed that heat-pressed all-ceramic crown and the parts of porcelain made by manual works had many and several size of internal defects.
By means of micro CT, it was possible to non-destructively and three-dimensionally examine all-ceramic crowns for internal adaptation and defects. If micro CT was easily used in clinically, it was recognized that the fractures of metal-free crowns could be decreased.
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