Step-back eliminating tapered dental cutting instruments for improved root canal treatment and method
US6206695A · kind A · utility
Inventors
Key dates
| Filing date | Jan 5, 1999 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Jan 5, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C2201/002
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A step-back eliminating tapered dental cutting instrument for improved root canal treatment and a method of root canal therapy in which the instrument includes a first tapered working portion having spiral-shaped cutting edges which define a first tapered angle, and a second tapered working portion having spiral-shaped cutting edges which define at least one second tapered angle. The second separate tapered angle may have a compound curve taper steeper at the distal tip of the instrument. The root canal therapy method which eliminates the step-back procedure includes the step of using a series of progressively increasing diameter dental cutting tools, each having a first tapered portion at one taper angle, and having a second tapered portion at another steeper angle, which is steeper than the first taper portion, and using each progressively larger diameter dental cutting tool to the same working depth of the previous tool so that a rapid decrease in diameter is achieved at the apical orifice of the root canal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.