An overdenture holder device, which is configured to be fixed to a plurality of fixtures implanted into a target arch to detachably fasten an overdenture so as to connect a fixing bar to the plurality of fixtures, the overdenture holder device comprising:
- a holder abutment in which a through insertion portion is formed to be opened in both directions of a body portion having a bottom end portion inserted into a top end of the fixture and a fastening hole which penetrates the body portion in a longitudinal direction and has an inner circumferential side;
- a fastening screw having a bottom end portion inserted into the fastening hole to be screw-coupled with the inside of the top end of the fixture and a head portion formed at a top end portion of the fastening screw, the head portion extending radially outward;
- and
- a pressurizing device coupled with a top end of the body portion corresponding to a preset pressurizing direction and configured to provide a pressurizing force such that an outer surface of the fixing bar is pressurized and fixed to an inside of the through insertion portion by adjusting an inner gap of the through insertion portion,
- wherein in order to pressurize the outer surface of the fixing bar between an inner end of the through insertion portion and a bottom surface of the pressurizing device, a coupling groove which communicates with a central part of a top end of the through insertion portion while having a diameter exceeding an opening width of the through insertion portion is formed at a top end of the fastening hole in the body portion, and
- wherein the pressurizing device is provided as a pressurizing screw screw-coupled with the coupling groove and configured to pressurize the fixing bar toward the inner end of the through insertion portion,
- wherein the overdenture holder device further comprising a holder cover portion which has a vertically penetrating hollow to surround and be coupled with an outer surface of a top end portion of the body portion with which the pressurizing screw is coupled and comprises a communication insertion portion formed at bottom ends of both sides corresponding to the through insertion portion, opened downward, and extending along a longitudinal direction while being recessed upward such that both ends of the fixing bar inserted into the through insertion portion pass therethrough and are disposed,
- wherein the holder cover portion is integrally formed in a ring shape such that a top end portion covers an outer side of the coupling groove, and
- wherein a fixing protrusion protruding in a radial direction is formed on one surface of an inner surface of the holder cover portion and an outer surface of the body portion which come into surface contact, and a fixing groove portion in which the fixing protrusion is inserted and coupled therewith to fix the holder cover portion is formed in the other surface.