| 摘要 |
A method and apparatus for extirpating tissue from a radicular dental canal comprises a set of instruments having graduated lengths and diameters. In one embodiment of the invention, one instrument is of such length to extirpate the apical foramen. This full depth instrument has a first cutting length that conforms to a first taper angle between a conical apex and a first base diameter. The first cutting length is less than the length of the root canal. Above the first cutting length, the instrument may be cylindrical. The full depth instrument is followed by a second instrument having a length that is less than that of the full length instrument by the length of the first cutting length. The second instrument cutting length is also less than the length of the root canal and extends between a minor diameter at the tip of the instrument and minor diameter at the longitudinal end of the cutting length. The second instrument minor diameter is substantially the same as the major diameter of the full depth instrument.
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