1995 Fiscal Year Final Research Report Summary
The Fracture Cases of Hydroxyapatite Coated Blade Implants
| Project/Area Number |
06671960
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
補綴理工系歯学
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| Research Institution | Kyushu University |
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Principal Investigator |
HATSUSHITA Yasuyuki Kyushu University FACULTY OF DENTISTRY ASSISTANT PROFESSOR, 歯学部, 講師 (60159150)
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| Co-Investigator(Kenkyū-buntansha) |
MIZUTA Kunihiko Kyushu University FACULTY OF DENTISTRY Research Associate, 歯学部, 助手 (60253465)
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| Project Period (FY) |
1994 – 1995
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| Keywords | metal fatigue / fatigue test / rigid connection / Free-standing / Non-rigid-connection / 2d-FEM / contact problem / 3d-FEM |
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| Research Abstract |
SEM findings of fractured HA coated blade implant (Sumicikon) case show metal fatigue. Fatigue test of HA coated blade implant body indicates that it has enough fatigue strength in oral use. The results of 3-dimensional finite element analysis shows the connection between osseointegrated implant and natural tooth increases the tensile stress in neck of implant. The occlusal load at natural tooth, especially, with worse periodontal condition, increases the tensile stress magnitude.
In 1-implant system, rigid tooth-implant connection demonstrated lower stress level in bone than the models with non-rigid connectors. Although the incorporation of a non-rigid attachment can preclude overloading the implant, it does not produce any reduction of stress in the surrounding host bone.
In 2-implant system, the stress level in the bone was lowest for the prosthesis that was not connected to the natural abutment teeth but supported by two free-standing implant abutments.
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