1992 Fiscal Year Final Research Report Summary
Development of denture liners suitable for tissue conditioning, dynamic impression and temporary reline
| Project/Area Number |
02557076
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| Research Category |
Grant-in-Aid for Developmental 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., Professor, 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. Dental Hospital Instructor, 歯学部附属病院, 助手 (20168230)
SHIGETO Naofumi Hiroshima Univ.,Sch.,of Dent.,Associate professor, 歯学部, 助教授 (10136111)
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| Project Period (FY) |
1990 – 1992
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| Keywords | Denture liner / Viscoelasticity / Tissue conditioning / Dynamic impression / Temporary reline / Gelation time |
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| Research Abstract |
Soft denture liners are widely used in prosthetic dentistry clinic by means of its specific viscoelastic properties as tissue conditioning, dynamic impression, temporary reline, and so on. However, on its clinical implication, it is important that these materials have suitable properties for each purpose. The purpose of this study is to develope the denture liners which suitable for each clinical use.
1. Gelation time and viscoelastic properties of these materials are widely controled by molecular weight of powder, EtoH content, powder/liquid ratio and kind of plasticizer.
2. At tissue conditioning, it is necessary that molecular weight of powder is lower and EtoH content is smaller.
3. At dynamic impression, it is necessary that molecular weight of powder is lower and EtoH content is larger.
4. At temporary reline, it is necessary that powder/ liquid ratio and molecular weight of powder is higher and that EtoH content is smaller.
On the basis of these results, it is found that soft denture liners suitable for each purpose can be developed by changing chemical composition and structure of powder and liquid.
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