Root canal boring instrument e.g. endodontical file, for use in endodontics, has distal zone extending central zone that extends proximal zone, and cover of distal, central and proximal zones presenting shape of inverted cone
摘要
The instrument (10) e.g. endodontical file, has an end section (11) arranged for being mounted in a mandrel driven by an electric motor. A central zone (13) extends a proximal zone arranged adjacent to the end section. A distal zone extends the central zone and is arranged for assuring the guidance of the instrument in the canal. A cover of the distal, central and proximal zones presents a shape of inverted cone. The cover in the shape of inverted cone includes a part of large cross section corresponding to the distal zone and another part of small cross section corresponding to proximal zone.