Step-back eliminating tapered dental cutting instruments for improved root canal treatment and method
US5855479A · kind A · utility
Inventors
Key dates
| Filing date | Mar 12, 1996 |
| Grant date | Jan 5, 1999 |
| Priority date | — |
| Expiry date | Mar 12, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C2201/002
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A set of endodontic cutting instruments, each having handles and each having a different working tip diameter incrementally increasing in size from one instrument to the next. The set includes a first smaller standard size endodontic cutting instrument having a grasping end with a first color according to a standard color code, a second larger standard size endodontic cutting instrument having a grasping end with a second color according to the standard color code and a non-standard intermediate size endodontic instrument having a size between the first smaller standard size and the second larger standard size and having a grasping end with a color combination including a first portion having the first standard color corresponding to the first smaller standard size and a second portion having the second standard color corresponding to the second larger standard size. Nonstandard taper portions on the cutting instruments are provided to smooth stair step root canal cavities. The non-standard taper portions are identified by non-ISO color portions on the handles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.