2005 Fiscal Year Final Research Report Summary
To create metallic inlays by sintering the inlays in a microwave oven for four minutes without performing a series of casting processes
| Project/Area Number |
15592076
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
補綴理工系歯学
|
|---|
| Research Institution | The Nippon Dental University |
|---|
Principal Investigator |
OHKUMA Kazuo The Nippon Dental University, School of Dentistry at Niigata, Assistant Professor, 新潟歯学部, 講師 (50203740)
|
|---|
| Project Period (FY) |
2003 – 2005
|
| Keywords | sintered inlay / powder of silver / diameter of a particle / sintering shrinkage / twice firing / silver clay / Ag-Pd-Au alloy / microwave oven |
|---|
| Research Abstract |
We have devised a production method that creates metal inlays without a casting process.
2003
We understood that silver clay made inlay by sintering for four minutes in a microwave oven.
After soaking surface gold alloys (pressure welded sheets of 50 microns and 100 microns) in 0.1% solution of sodium sulfide at 37℃ for 3 days, their L^* are 71.5 and 73.5 respectively, and they meet specifications (T6105)
2004
We obtained Compressive strength 169 MPa by sintering powder of silver (0.7g), powder of copper (0.15g) and powder of iron (0.15g) for four minutes in a microwave oven.
2005 Improvement of sintering shrinkage
Powder of silver was exposed to the temperature that several hundred degrees are high in than a silver melting point.
Then, I thought that I could improve the shrinkage because only the surface fired.
When powder of silver and porcelain fired, changed color in yellow.
Twice firing was able to improve 2.5% sintering shrinkage
Utilizing a microwave oven and a laser system, metal inlays can be made in thirty minutes.
|
