Dental crown and method of installation thereof
Abstract
Abstract THE DENTAL CROWN OF THIS INVENTION INCLUDES AN OCCLUSAL SURFACE AND A SIDEWALL THAT TAPERS IN CROSS SECTION TOWARD A RESTRICTED OPENING AT THE CERVIX, WHERE THERE IS A ROUNDED INNER CORNER. THE CENTRAL GROOVE AT THE OCCLUSAL SURFACE HAS SHARP CONVERGENCE AND A THIN WALL AT ITS BASE, ALLOWING THE DEPTH OF THE GROOVE TO BE VARIED, WHILE THE CUSPS OF THE OCCLUSAL SURFACE HAVE A THICKENED WALL. THE CROWN IS INSTALLED BY PUSHING IT ONTO THE PREPARED TOOTH TO EXPAND THE CREVIX AND CAUSE TO BECOME COMPLEMENTARY TO THE CERVICAL END OF THE TOOTH. AFTER THIS, THE CROWN IS REMOVED, AN EXCESS OF CEMENT IS INTRODUCED INTO ITS INTERIOR, AND IT IS REPLACED ON THE TOOTH, AFTER WHICH THE CERVICAL CORNER IS BURNISHED TO FORM A FEATHER EDGE WHERE THE TOOTH IS ENGAGED.
Inventors
- 👤 George G Simor
Bibliographic Details
Claims Analysis
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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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |