| Project/Area Number |
08457527
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
補綴理工系歯学
|
|---|
| Research Institution | Okayama University |
|---|
Principal Investigator |
IRIE Masao Okayama University, Dental School, Assistant Professor, 歯学部, 助手 (90105594)
|
|---|
| Project Period (FY) |
1996 – 1998
|
| Project Status |
Completed (Fiscal Year 1998)
|
| Budget Amount *help |
¥8,200,000 (Direct Cost: ¥8,200,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1996: ¥6,500,000 (Direct Cost: ¥6,500,000)
|
|---|
| Keywords | Geriatric society / Restorative materials / Study / Glass ionomer / Light-activated glass ionomer / Marginal leakage / Bonding / Setting shrinkage / 間際 |
|---|
| Research Abstract |
The effect of storage in water on marginal gap formation using resin-modified glass-ionomer restorative materials for geriatric dentistry were evaluated The bond and flexural strengths of the glass-ionomer materials were examined to determine the influence that marginal gap formation has on retention strengths of the restorations.
When the cavity preparations were filled with a glass-ionomer and polioshed immediately after setting, a marginal gap of approximately 15 mum was formed. In contract, when polishing following storage in water the marginal gap was 0 to 2 mum for the resin-modified glass-ionomer restorative materials. The bond strength of the glass-ionomer to enamel and to dentin and the flexural strength of the glass-ionomer increased after storage in water. The marginal seal of glass-ionomer restorations may not only be improved due to hygroscopic expansion during storage in water but also may exhibit greater bond strength.
Therefore polishing following storage in water is more beneficial for geriatric dental field.
|
