Patent ID: 8714978

Claim:
A system for an endodontic treatment of a root canal, comprising (i) an endodontic instrument; (ii) an endodontic handpiece having a drive motor for rotating the endodontic instrument releasably attached to the handpiece; (ii) a control unit for controlling the rotation of the endodontic instrument according to one or more predetermined rotational sequences; the rotational sequences comprising reciprocating the endodontic instrument by continuously sequentially rotating the endodontic instrument in a first direction followed by reversing the direction of rotation so that 0.5×Ψ≦α<Ψ and 3≦α/β≦20, wherein α represents a rotational angle in a direction in which the rotating endodontic instrument removes debris from the root canal, β represents a rotational angle in the opposite direction, and Ψ represents the elastic angle of the endodontic instrument at which plastic deformation occurs in the direction of α, wherein a single endodontic instrument is capable of performing the root canal treatment, the rotational sequences further comprising (i) the endodontic instrument is rotated in a first rotational direction to remove material when a control parameter is below a first threshold value, (ii) the endodontic instrument is reciprocated when the control parameter is greater than or equal to the first threshold value, and the endodontic instrument is rotated only in the rotational direction opposite to the first rotational direction in order to free the instrument when the control parameter is greater than or equal to a second threshold value that is greater than the first threshold value.