1993 Fiscal Year Final Research Report Summary
Rheological study of denture liners for elderly edenturous patients
| Project/Area Number |
03454449
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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 | HIROSHIMA UNIVERSITY |
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Principal Investigator |
HAMADA Taizo Hiroshima Univ., Sch., of Dent., Proffessor, 歯学部, 教授 (50034244)
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| Co-Investigator(Kenkyū-buntansha) |
MURATA Hiroshi Hiroshima Univ., Sch., Of Dent., Instructor, 歯学部, 助手 (40229993)
ISHIDA Hiroshi Hiroshima Univ., Sch., of Dent., Instructor, 歯学部・附属病院, 助手 (20168230)
SHIGETO Naofumi Hiroshima Univ., Sch., of Dent., Associate Proffessor, 歯学部, 助教授 (10136111)
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| Project Period (FY) |
1991 – 1993
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| Keywords | Elderly edenturous Patients / Denture liner / Rheology / Viscoelasticity / Tissue conditioning / Dynamic impression / Temporary reline / Celation time |
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| Research Abstract |
Denture liners are essential to treat elderly edentulous patients. The purpose of this material are tissue conditioning, dynamic impression and temporary relining. However, viscoelastic change with time and rate of gelation answering the purpose are different. At dynamic impression, it is needed to consider about dimensional change by shrinkage with time.
1. At dynamic impression, it is necessary that molecular weight of powder is lower. DBS and BPBG are desirable as plasticizer.
2. At temporary relining, it is necessary that molecular weight of powder is higher. BB and BS are desirableas plasticizer.
3. Particle size in powder and the EtOH content in liquid have influence dimensional change. It is necessary to decide chemical composition and structual factor considering about period and purpose.
On the basis of those results, it is found that soft denture liners suitable for each purpose can be developed by chaging chemical composition and structure of powder and liquid.
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