| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
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| Research Abstract |
We devised a production method for copings of all-ceramic crowns, which is possible at low cost and in a very short time. However, improvement was still necessary to make it widely available. A 4-step build up was most suitable for producing a coping of 0.5 mm in thickness. We found that the 3-point bending strength of the coping markedly increased to 183-211.3 MPa, and the highest strength was achieved when the mixing ratio of rough to fine grains was 40:50 (wt%). The fitness of coping did not have the influence by the preparation design of abutment tooth. It was suggested that fitness was improved by using a hot blast in a dry process. Even if glass infiltration firing time was shortened for 30 minutes, the glass infiltrated it enough.
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