| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and a tool for pulling out a fragment with which the fragment of an instrument left in a root canal part is easily pulled out. <P>SOLUTION: The method for pulling out the fragment of a root canal treatment instrument broken during root canal treatment comprises: a step of putting the head CH of the fragment C in the root canal into a recessed part 11 at the distal end of a flexible shaft provided at a cutting and expansion tool 1, inversely rotating the flexible shaft and expanding a pulp cavity with a cutting blade 13 provided at the distal end; a step of making a recess art 21 at a distal end of an ultrasonic cutting tool 15 oppose the fragment C, applying ultrasonic vibration to the cutting tool 15 to cut and remove a dentin around the head CH of the fragment C, and expanding furthermore; and a step of tightly fastening and pulling out the head CH of the fragment C with the loop part 35 of a wire member 37 projecting from the distal end of a pipe material 31 provided at the fragment pulling out tool. <P>COPYRIGHT: (C)2004,JPO |
