Abstract
The drill tool comprises a hollow cylinder-shaped element, having one side circumferentially adapted to remove hard dental tissues (a working side). The hollow cylinder is on its second side (a non-working side) provided with a grip attachment with a terminal which is attachable to a rotary drive.
For example, the adaptation to remove hard dental tissues may take the form of sawtooth teeth or diamond grains. Briefly, the surface must be roughened to allow dentine drilling around the fractured fragment.
The instrument is led through the root canal, and it starts to work only at the site of the fractured fragment. This avoids unnecessary root canal expansion and reduces the risk of perforation of the canal wall.
The tool is used for drilling the dentine around the circumference of the fractured fragment (about 0.5 to 1 mm) to release the end of the fragment.