| Project/Area Number |
11557149
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 展開研究 |
|---|
| Research Field |
補綴理工系歯学
|
|---|
| Research Institution | Tokyo Medical & Dental University |
|---|
Principal Investigator |
SATO Takahiro Tokyo Medical & Dental University, Graduate school, research associate, 大学院・医歯学総合研究科, 助手 (70178747)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
IKUSHIMA Keisuke GC Corporation, Research & Development Department, Researcher, 研究員
YOSHIDA Keiichi Tokyo Medical & Dental University, Graduate school, research associate, 大学院・医歯学総合研究科, 助手 (60240280)
TAKAHASHI Hidekazu Tokyo Medical & Dental University, Graduate school, Associate professor, 大学院・医歯学総合研究科, 助教授 (90175430)
|
|---|
| Project Period (FY) |
1999 – 2001
|
| Project Status |
Completed (Fiscal Year 2001)
|
| Budget Amount *help |
¥8,900,000 (Direct Cost: ¥8,900,000)
Fiscal Year 2001: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2000: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1999: ¥6,800,000 (Direct Cost: ¥6,800,000)
|
|---|
| Keywords | paste porcelain / aesthetic restorations / new development / material test / index method / pre-firing furnace / プレ・ファーネス炉 |
|---|
| Research Abstract |
In the year 1999, fundamental properties of this paste porcelain were tested according to ISO6872 : 1995 and the results were presented at 78^<th> General Session ＆ Exhibition of the IADR in Washington D,C. in April 6, 2000. The average flexural strength for paste porcelain was 109.3±8.5 MPa, which was significantly higher than that for conventional powder porcelain, G-Cera ORBIT, whose value was 88.6±7.7MPa. The result of chemical solubility test after refluxing 16hours in 4% acetic acid was 21.8μg/cm^2, which was within the range of 100μg/cm^2(max). In the year 2000, we continued to improve the quality of paste porcelain according the advices from the co-operative researcher, Dr. Tsuchihira, who is the senior lecturer of the school for dental technicians. In the final year, the bond strengths were tested according to ISO/FDIS 9693 : 1999, Metal Ceramic Dental Restorative Systems. The average bond strength measured for paste porcelain was different according to the alloy used, which were 54.3±3.8MPa (MC70) and 43.7±5. 1 MPa(D.U.) respectively. They were similar or slightly higher than that for conventional powder porcelain. These results will be shown at the 80^<th> General Session ＆ Exhibition of the IADR(March6-9) in San Diego.
(Problems to be solved in the future)
1. When used for a single crown, there is no problem ; however, in case used for a fixed partial denture, detachments and the crack may happen because of the large amount of paste porcelain.
2. A pre-firing drying furnace (which can raise the temperature till 300℃ and has the ventilation function)is thought to be essential to keep the air clean and to protect the conventional porcelain furnace.
|
