INVESTIGATIONS ON THE DEFORMATION AND STRESS DISTRIBUTIONS CONCERNING DENTURES TAKING INTO ACCOUNT THE CONTACT BETWEEN MUCOUS MEMBRANE AND DENTURES
| Project/Area Number |
62460212
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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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 | Tokyo Medical and Dental University |
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Principal Investigator |
MIYAIRI Hiroo Tokyo Med.Dent.Univ., Inst.Med.Dent.Engng, Professor, 医用器材研究所, 教授 (50013892)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAYAMA Yosiaki Tokyo Med.Dent.Univ., School of Dentistry, Lecturer, 歯学部, 講師 (80143593)
FUKUDA Hideaki Tokyo Med.Dent.Univ., Inst.Med.Dent.Engng, Assistant, 医用器材研究所, 助手 (50014163)
NAGAI Masahiro Tokyo Med.Dent.Univ., Inst.Med.Dent.Engng, Assistant, 医用器材研究所, 助手 (10013971)
TAKAKUDA Kazuo Tokyo Med.Dent.Univ., Inst.Med.Dent.Engng, Asoc. Prof., 医用器材研究所, 助教授 (70108223)
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| Project Period (FY) |
1987 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 1989: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1988: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | COMPLETE DENTURE / MUCOUS MEMBRANE / DEFORMATION OF DENTURE / COMPRESSIBITY OF MUCOUS MEMBRANE |
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| Research Abstract |
We study here the deformation of roal mucous membrane and dentures in contact, and obtained the following results:
1. The analytical models which simulates the deformations of mucous membrane under pressure induced by dentures are developed. In these models the shearing deformation and the flow of the liquid components are considered, and which enable us to simulate the effects of the area dependency of the load-deformation relationships observed in case of indentation testings.
2. From the computer simulations, it is concludes that the protrusion of mucous membrane surface must be take place at the vicinity of the indented area. Hence we take the impressions from fresh cadavers for the cases of pressures are absent and the cases of strong pressures being applied. By detecting the surface of plaster models by the non-contacting displacement gauge, we could certificate the above mentioned tenomena.
3. Experimental investigations are also carried out. We make models utilizing plaster and silicone RTY rubber, in which miniature pressure sensors are mounted. The measured data from sensors give the pressure distributions under the resin indenters. In the cases of both surfaces of rubber and resin are flat and fitness is good, we found that the effects of the rigidity of the resin plate is small. The pressure distributions obtained are quite different from the simple linear spring models.
4. In the cases that there exists some unfitness on the surfaces, which corresponds to the ill-fitted dentures, we found that the Very small amount of unflatness significantly affects the pressure distributions.
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Report
(4 results)
Research Products
(2 results)
