Endodontic dental instrument
US5106298A · kind A · utility
62Cited by
12References
16Claims
0Family size
Inventors
Key dates
| Filing date | Apr 3, 1991 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Apr 3, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C5/42
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An endodontic instrument is disclosed which comprises an elongate shank having a lower working length. One or more helical flutes are positioned on the working length, and the bottoms of the flutes define a solid core which is cylindrical in one embodiment, and reversely tapered in another embodiment. The solid core permits the working length to permanently twist upon becoming locked in the canal during root canal therapy, and the twists move upwardly from the point of locking engagement until they may be visually and/or tactilely noted by the dentist, and so that the dentist is alerted before breakage occurs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.