J Bolt
US4362511A · kind A · utility
Inventor
Key dates
| Filing date | Jul 9, 1981 |
| Grant date | Dec 7, 1982 |
| Priority date | — |
| Expiry date | Jul 9, 2001 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C13/30
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A threaded device is provided which can be screwed into the tooth root of a broken tooth to aid in the attachment of a crown or similar prosthesis. The threaded device has a head which is in the shape of a spherical segment of less than a hemisphere which holds a retention ring, a shim, and in some embodiments a coping dish whereby the device of the present invention can be screwed into a threaded hole in the tooth, a dental cement applied thereto and a crown or other prosthesis applied over the head of the bolt and retention ring. In a preferred embodiment of the invention, the retention ring is in the form of a spherical segment which is complementary to the spherical segment of the head to provide a complete spherical head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.