2019 Fiscal Year Research-status Report
Fabrication of bioactive zirconia implant
Project/Area Number |
19K10250
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Research Institution | Nagasaki University |
Principal Investigator |
バラネザハド アリレザ 長崎大学, 医歯薬学総合研究科(歯学系), 助教 (00608870)
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Co-Investigator(Kenkyū-buntansha) |
渡邊 郁哉 長崎大学, 医歯薬学総合研究科(歯学系), 教授 (00274671)
尾立 哲郎 長崎大学, 病院(歯学系), 講師 (70513167)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | インプラント / ジルコニア / 生体活性 |
Outline of Annual Research Achievements |
Surface roughness and chemical composition are vitally important factors in implants. The aim of this study is the fabrication and assessment of a new zirconia implant with embedded and fused zirconia beads on the surface. For manufacturing of the zirconia substrates coated with zirconia beads, the zirconia powder pressed with 61 MPa pressure in the stainless mold, followed by pressing of the zirconia beads with two different diameters, 53 μm (B53) and 125 μm (B125), to the surface of zirconia tablet with 74 MPa pressure. The zirconia beads partially embedded into the un-sintered zirconia tablet surface. The prepared zirconia tablets with embedded zirconia beads on the surface were sintered at 1200°C for 12 hours. After sintering, a porous bead-fused surface was prepared on the zirconia disc. The firmly adhered beads on top of the zirconia substrate surface The surface and cross-section microstructure was observed using optical microscope and preliminary evaluation confirmed that the beads adhered firmly to the surface.
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Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
It was found that the zirconia beads embedded and fused to the zirconia implant surface and firmly adhered to the implant surface.
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Strategy for Future Research Activity |
To evaluate adhesive strength between the embedded and fused zirconia beads and the zirconia bulk, stainless steel rods with 4 mm diameter will bond to the rough surface of the zirconia substrate with acrylic super glue. An adhesion test will be performed at a cross-head speed of 2 mm/min by a universal testing machine (model 5566S, Instron Co., Canton, MA, USA) with a universal joint to ensure axial loading. The adhesive strength of the beads layer will be confirmed from the maximum recorded-load. The mean values of the adhesive strength and their standard deviation (SD) will be measured for ten samples. For Microstructural and chemical characterizations, the field emission scanning electron microscope (FE-SEM: JSM-7500 FAM, JEOL, Tokyo, Japan) combined with EDS will be used for morphological, fractographical and elemental evaluation of the bead-fused zirconia samples at 15kV of accelerating voltage after the gold sputtering. The surface roughness of the samples will be determined by 3D laser microscope (VK- 9710K, Keyence, Osaka, Japan) according to ISO 4287. An average value of Rz will be calculated by linear roughness analyzing on the samples.
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Causes of Carryover |
学会の延期に伴い旅費の執行がなくなったため,次年度使用額が生じた。翌年度分として請求した助成金は大部分を実験に使用する物品費に使用する 計画である。
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