| 摘要 |
<p>A dental file which is useful in endodontia for removing dead or damaged tissue from a curved tooth root canal while minimizing the tendency to form ledges and slits. The file has a flexible tapered shank (12) which has a cutting surface (20, 22) on its periphery and a pilot (15) projecting from the tapered end of the file for guiding the shank (12) along the curved root canal preventing the cutting surface (20, 22) near the end of the shank (12) from gouging into the wall of the curved root canal or penetrating too far through the apical foramen of the root canal. A set of dental files is also disclosed in which the files in the set increase in diameter from one file to the next larger file in the set. In such a set the diameter of the pilot on each file is substantially the same for all files in the set.</p> |
