Abstract: The present invention relates to an artificial root canal simulator based on hydroxyapatite, comprising a cavity representing a root canal, said artificial root canal simulator having a porosity of between 10% and 40% and a Vickers hardness of 50 to 200 HV, and to a method for the manufacture of an artificial root canal simulator according to the invention.

Abstract: A dental power instrument, in particular, an endodontic instrument, has an operative part (2) at one end and a handle (3) at the opposite end. The handle (3) of the dental instrument is provided with a rotary drive (4) which, when mounted in the head (5) of a handpiece, can directly engage with a rotary drive (4?) upstream of the head. The rotary drive (4) can be inserted and withdrawn independently of the rotary drive (4?) associated with the head of the handpiece, and rotates in the same direction as the rotary drive (4?) associated with the handpiece. Also provided is a handpiece head (5) and a dispenser (30) for such dental power instruments.

Abstract: The invention relates to a dental power instrument, in particular an endodontic instrument, comprising an operative part (2) and a handle (3) which is disposed at the opposite end to said operative part (2). The invention is characterized in that the handle (3) of the dental instrument is equipped with a rotary drive means (4) which, when mounted in the head (5) of a handpiece, can engage directly with a rotary drive means upstream of said head. Moreover, the aforementioned drive means (4) can be retracted independently of the means used to drive the handpiece head and said drive means (4) rotates in the same direction as the handpiece head drive means. The invention also relates to a handpiece head and a dispenser for such dental power instruments.