A root canal treatment device relates to the technical field of dental treatment instruments. The root canal treatment device includes a contra-angle hand-piece and a root canal file detachably connected to the contra-angle hand-piece, and further includes a drive module in transmission connection with the root canal file, the drive module includes a rotation driver and a vibration generator, wherein the rotation driver is configured to drive the root canal file to rotate axially, so as to mechanically cut and ream the root canal, thus shaping the root canal, and the vibration generator is configured to drive the root canal file to vibrate radially.

An automated dental drill includes an end effector, including a dental tool for disposition at least partially in a patient's mouth and to perform an operation on a tooth. A tooth clamp releasably rigidly attaches to at least one tooth. A drive assembly is controlled by a processor and positions the end effector with a first at least three degrees of freedom, relative to the tooth clamp. The drive assembly remains outside the patient's mouth. A clamp connector connects the tooth clamp to the drive assembly. With the tooth clamp coupled to the drive assembly and the tooth clamp attached to the at least one tooth, position and orientation of the drive assembly remain fixed, relative to the at least one tooth. A passive cantilever arm, mechanically coupled between a support structure and the drive assembly, has a second at least three degrees of freedom and supports the drive assembly.

An automated dental drill includes an end effector, including a dental tool for disposition at least partially in a patient's mouth and to perform an operation on a tooth. A tooth clamp releasably rigidly attaches to at least one tooth. A drive assembly is controlled by a processor and positions the end effector with a first at least three degrees of freedom, relative to the tooth clamp. The drive assembly remains outside the patient's mouth. A clamp connector connects the tooth clamp to the drive assembly. With the tooth clamp coupled to the drive assembly and the tooth clamp attached to the at least one tooth, position and orientation of the drive assembly remain fixed, relative to the at least one tooth. A passive cantilever arm, mechanically coupled between a support structure and the drive assembly, has a second at least three degrees of freedom and supports the drive assembly.

A dental handpiece includes: a head including a holder configured to hold a cutting tool, a tool rotation mechanism configured to rotate the cutting tool, a housing including the holder and the tool rotation mechanism, and a cooling passage formed in a side wall of the housing; and a grip including a first air supply passage configured to supply first air for cooling the tool rotation mechanism, and a second air supply passage connected to the cooling passage and configured to supply the head with second air lower in flow rate than the first air. The head is joined to the grip such that, of an angle formed between a rotation axis of the cutting tool and a major axis of a coupling portion of the grip which is coupled to the head, an angle on a cutting edge side of the cutting tool is an obtuse angle.

A dental handpiece includes: a head including a holder configured to hold a cutting tool, a tool rotation mechanism configured to rotate the cutting tool, a housing including the holder and the tool rotation mechanism, and a cooling passage formed in a side wall of the housing; and a grip including a first air supply passage configured to supply first air for cooling the tool rotation mechanism, and a second air supply passage connected to the cooling passage and configured to supply the head with second air lower in flow rate than the first air. The head is joined to the grip such that, of an angle formed between a rotation axis of the cutting tool and a major axis of a coupling portion of the grip which is coupled to the head, an angle on a cutting edge side of the cutting tool is an obtuse angle.

Endodontic instruments are used to clean and enlarge the endodontic cavity space (ECS), also known as the root canal system, of a human tooth. This document describes novel endodontic instruments that are radially compressible, and methods for their use.

Endodontic instruments are used to clean and enlarge the endodontic cavity space (ECS), also known as the root canal system, of a human tooth. This document describes novel endodontic instruments that are radially compressible, and methods for their use.

A vibration-side housing is attached to a tip of a handle-side housing, and a motor in which a plate cam is attached to a rotating shaft is housed. A vibration tube mounting opening opens at distal end part of the vibration-side housing, and a vibration tube is mounted thereon. The vibration tube is provided to vibrate in a forward-backward direction while urged in the plate cam direction via a spring with respect to the vibration-side housing. The vibration tube contacts with the plate cam via a roller at a rear end part. A reamer mounting opening opens at a tip of the vibration tube, and receives and tightly holds an insertion part of the reamer. The reamer including the bendable needle part is attachable/detachable to the vibration-side housing.

A vibration-side housing is attached to a tip of a handle-side housing, and a motor in which a plate cam is attached to a rotating shaft is housed. A vibration tube mounting opening opens at distal end part of the vibration-side housing, and a vibration tube is mounted thereon. The vibration tube is provided to vibrate in a forward-backward direction while urged in the plate cam direction via a spring with respect to the vibration-side housing. The vibration tube contacts with the plate cam via a roller at a rear end part. A reamer mounting opening opens at a tip of the vibration tube, and receives and tightly holds an insertion part of the reamer. The reamer including the bendable needle part is attachable/detachable to the vibration-side housing.

An abnormality determination device for a dental handpiece, the abnormality determination device including: an electrical current output unit configured to supply, to a drive motor attached to the dental handpiece, a test electrical current in a no-load state, the test electrical current being smaller than a no-load electrical current at a rotational speed of the dental handpiece during a normal treatment in the no-load state; a rotational speed detector configured to detect a rotational speed of the drive motor in a state where the test electrical current is supplied; a processor configured to compare the rotational speed detected by the rotational speed detector with a threshold rotational speed; and an abnormality detector configured to determine abnormality that the dental handpiece is abnormal if the rotational speed detected by the rotational speed detector is smaller than the threshold rotational speed.