Dental instrument e.g. endodontic instrument, has handle with rotating gear wheel directly engaged in upstream of head of hand piece, and shoulder situated near gear wheel, that is directed towards active part

摘要

The instrument (1) has an active part (2) and a handle (3) arranged at an opposite end of the active part. The handle has a rotating gear wheel (4) directly engaged in an upstream of a head of a hand piece. A shoulder (25) situated near the wheel is directed towards the active part. The head has a boring that provides housing for the handle and a maintaining unit axially retracting from the handle of the instrument.