Tooth filling and facing compositions comprising a radiopaque glass and method of making the same
Abstract
Abstract A FILLER COMPOSITION FOR TOOTH FILLING AND FACING COMPOSITIONS COMPRISING (1) A FINELY DIVIDED INORGANIC MATERIAL, AND (2) A BARIUM ALUMINOSILICATE GLASS OR OTHER GLASS HAVING AN EFFECTIVE AMOUNT OF RADIOPAQUE OXIDE THAT RENDERS THE RESULTANT GLASS RADIOPAQUE TO X-RAYS USED BY DENTISTS. THE FILLER COMPOSITION IS MIXED WITH AN ORGANIC POLYMER SUCH AS METHYL METHACRYLATE TO PROVIDE A TOOTH FILLING AND FACING COMPOSITION HAVING AN OUTSTANDING COMBINATION OF DESIRABLE PROPERTIES INCLUDING A COLOR RESEMBLING THAT OF NATURAL TEETH, A SUITABLE INDEX OF REFRACTION, HARDNESS, WEAR RESISTANCE, A RELATIVELY LOW THERMAL EXPANSION MATCHING THAT OF NATURAL TEETH, AND BEING RADIOPAQUE TO X-RAYS USED BY DENTISTS.
Inventors
- 👤 E Dietz
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |