Detachable stopper for dental drill

A detachable stopper for a dental drill to be externally fitted to and fixed at a position on a spindle part of a dental drill from a front end side or a rear end side of the dental drill so as to regulate a depth of a drilled hole, the dental drill usable for boring an implant fixture embedding hole in an implant treatment, and the dental drill having a blade part at a front end side of the spindle part, the spindle part having a diameter shrunk part formed as a mounting part for preventing slipping-off a dental hand piece at a rear end thereof, or the spindle part being in a cylindrical shape having an equal diameter without having the diameter shrunk part, the detachable stopper comprising:

• a stopper main body being made of an elastically deformable metal material, the stopper main body having a cylindrical shape, having a bore with an inner diameter smaller than an outer diameter of the spindle part of the dental drill in a stationary state, having a slit part formed along an axial overall length from an outer peripheral face to an inner peripheral face of the stopper main body as an opening to the bore, and having a diameter expanding tool insertion part bored through an axial center part of the slit part,
• wherein the stopper main body has a diameter expanding auxiliary portion recessed toward the inner peripheral face along the axial overall length that is formed on the outer peripheral face of a portion of the stopper main body opposite to the slit part beyond a center axis of the stopper main body;
• and
• a diameter expanding tool having a shape so that the diameter expanding tool is freely insertable into and removable from the diameter expanding tool insertion part of the stopper main body, the diameter expanding tool, when inserted into the diameter expanding tool insertion part, expands the inner diameter of the bore of the stopper main body to be larger than the outer diameter of the spindle part of the dental drill.

A dental drilling system usable for boring an implant fixture embedding hole in an implant treatment, comprising:

• a dental drill, the dental drill including a spindle part, and the dental drill having a blade part at a front end side of the spindle part, the spindle part having a diameter shrunk part formed as a mounting part for preventing slipping-off a dental hand piece at a rear end thereof, or the spindle part being in a cylindrical shape having an equal diameter without having the diameter shrunk part;
• and
• a detachable stopper to be externally fitted to and fixed at a position on the spindle part of the dental drill from a front end side or a rear end side of the dental drill, so as to regulate a depth of a drilled hole, the detachable stopper including
• a stopper main body being made of an elastically deformable metal material, the stopper main body having a cylindrical shape, having a bore with an inner diameter smaller than an outer diameter of the spindle part of the dental drill in a stationary state, having a slit part formed along an axial overall length from an outer peripheral face to an inner peripheral face of the stopper main body as an opening to the bore, and having a diameter expanding tool insertion part bored through an axial center part of the slit part, and
• a diameter expanding tool having a shape so that the diameter expanding tool is freely insertable into and removable from the diameter expanding tool insertion part of the stopper main body, the diameter expanding tool, when inserted into the diameter expanding tool insertion part, expands the inner diameter of the bore of the stopper main body to be larger than the outer diameter of the spindle part of the dental drill so that the stopper main body is movable along the spindle part, and the diameter expanding tool, when removed from the diameter expanding tool insertion part while the bore surrounds the spindle part, enables the inner diameter of the bore to contract to be externally fitted to and fixed on the spindle part.