Underfilling material for toothfillings
Abstract
Abstract A process for preparing an adhesive material for tooth fillings, consists in mixing a base of calcium hydroxide with up to 50 per cent by weight of dry casein powder. The calcium hydroxide may be made from calcium oxide to which a watery solution containing sodium chloride, potassium chloride, calcium chloride and magnesium chloride is added. The mixture of calcium hydroxide and these chlorides is then dried and casein powder added so that the finished dry mixture contains .522 per cent by weight of sodium chloride, .012 per cent by weight of potassium chloride, .012 per cent by weight of calcium chloride, .007 per cent by weight of magnesium chloride. The dry mixture is stored in hermetically sealed flasks. For application to a tooth some dry mixture is stirred with water to form a paste. Some of the calcium hydroxide may be replaced by an equimolar amount of calcium oxide which is added to the dry mixture, the heat produced when water is added to the mixture before application assisting the stirring process.
Inventors
- 👤 Adolf Knappwost
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |