Drill assistance device, screw guide device, and orthodontic tool installation-assisting device set

A screw guide device that serves as a guide for implanting a screw in a pilot hole provided in a curved surface of a hard palate having the curved surface, the screw guide device comprising:

• a guide frame unit that is configured to be arranged on the curved surface and has a tubular guide frame;
• a fixing member configured to be capped on a tooth of a patient;
• a connecting portion that connects the guide frame unit and the fixing member and determines arrangement of the guide frame unit on the curved surface with reference to the tooth when in use;
• one or more protruding portions that protrude from portions of the guide frame unit on a side opposite to a side facing the curved surface and restrict an implanting depth of the screw in the hard palate, the screw being implanted through a hole inside the guide frame;
• and
• a screw retainer comprising:
• a retainer main body that has a tubular fitting portion for fitting the screw from a tip end side and can be inserted into the hole of the guide frame in a state in which the screw is fitted in the fitting portion;
• and a flange portion that is provided from a position midway in a length direction of the retainer main body so as to be able to come into contact with the protruding portion,
• wherein a projection height of the protruding portion is set so that the screw is implanted in the hard palate at a predetermined depth when the flange portion of the screw retainer and the protruding portion come into contact with each other and fitting between the fitting portion and the screw is released to stop implant of the screw based on rotation of the retainer main body.

An orthodontic tool installation-assisting device set comprising:

• a guide device that serves as a guide for a drill that forms a plurality of pilot holes by drilling a curved surface of a hard palate having the curved surface, the guide device also serving as a guide that implants a screw in each of the plurality of pilot holes;
• a guide sleeve that is fitted in the guide device in an attachable and detachable manner;
• and
• a screw retainer,
• the guide device comprising:
• a guide frame unit that is configured to be arranged on the curved surface and formed by connecting a plurality of tubular guide frames to each other, wherein each tubular guide frame has a hole inside;
• a fixing member configured to be capped on a tooth of a patient;
• a connecting portion that connects the guide frame unit and the fixing member and determines arrangement of the guide frame unit on the curved surface with reference to the tooth when in use;
• and
• at least one protruding portion that protrudes from at least one portion of the guide frame unit on a side opposite to a side facing the curved surface and holds the guide sleeve inserted in any of the holes inside the guide frames,
• the guide sleeve comprising:
• a tubular sleeve main body having an inner diameter that allows the drill to be inserted and an outer diameter that allows the sleeve main body to be inserted in any of the holes of the guide frames;
• a water injection slit that is provided in a direction in which the sleeve main body extends;
• and
• projecting portions that are provided on an outer peripheral surface of the sleeve main body and are each fitted in at least one recessed portion provided in the at least one protruding portion when the sleeve main body is inserted in any of the holes of the guide frames,
• wherein a sum of a number of the at least one recessed portion and a number of the projecting portions is three or more,
• wherein when the guide sleeve is inserted in any of the guide frames, one of the at least one recessed portion and one of the projecting portions can be fitted to each other so that the water injection slit faces an oral cavity vestibular side,
• wherein the screw retainer comprises:
• a retainer main body that has a tubular fitting portion for fitting the screw from a tip end side and can be inserted into any of the holes of the guide frames in a state in which the screw is fitted in the fitting portion;
• and
• a flange portion that is provided from a position midway in a length direction of the retainer main body so as to be able to come into contact with the protruding portion,
• wherein a projection height of the protruding portion is set so that the screw is implanted in the hard palate at a predetermined depth when the flange portion of the screw retainer and the protruding portion of the guide device come into contact with each other and fitting between the fitting portion and the screw is released to stop implant of the screw based on rotation of the retainer main body.