Fixed hybrid dental attachment assembly and methods of use
View Patent ↗A frictionally-retained detachable dental attachment assembly or anchor device is designed to attach a dental appliance with a tooth root or implant. The assembly includes a denture attachment housing for securing in the dental appliance, an abutment attached with a tooth root or implant, and a compressible retention member with a first end in fixed attachment with the cap and a second end in snap engagement with the abutment via a frictionally-retained ball secured within a cavity of the abutment. The retention member is formed using a compressible material to allow the ball to compress and the retention member to flex while inserting the ball into the cavity. Additional friction-retained and fixed attachment configurations of the dental anchor device are provided, along with methods of securing a dental appliance in a subject's mouth by means of the friction-retained and fixed attachment dental anchor devices.
1. A dental attachment assembly, comprising:
a denture attachment housing for securing with a dental appliance, the denture attachment housing having an inner cavity having an inner end wall and an open outer end;
an abutment for securing to a dental base structure, the abutment having a central longitudinal axis, a first end and a second end, and a socket having an outer end opening at the first end of the abutment and an inner end, and extending inward from the outer end opening towards the second end of the abutment, the socket having a continuous peripheral wall extending from the outer end opening to the inner end, and an annular projection in the peripheral wall and axially spaced from the outer end opening, the annular projection having a rounded portion with an undercut edge forming a barb; and
a retention member having a first end secured to the inner end wall of the inner cavity, an at least partially spherical head at a second end of the retention member for insertion in the socket, and a shaft extending from the first end to the head, the head having a first end at a junction between the head and the shaft, a second end, and a maximum diameter surface portion spaced from the first end, the maximum diameter surface portion being configured for frictional, detachable engagement with the annular projection in the socket at a location which is axially spaced from the junction with the shaft and the outer end opening of the socket when the head is engaged in the socket, at least the maximum diameter surface portion of the head being formed of a compressible material whereby the annular, inwardly directed projection compresses an opposing surface portion of the head and the barb bites into the material of the head to resist removal of the head from the socket.
2. The assembly of claim 1 , wherein the head engages only the annular projection and not any other part of the socket when fully inserted in the socket.
3. The assembly of claim 1 , wherein the entire retention member is formed of a compressible material.
4. The assembly of claim 3 , further comprising a set of retention members having heads configured to provide different amounts of retention force.
5. The assembly of claim 4 , wherein each retention member is made of a compressible material selected from the group consisting of polymers and metals.
6. The assembly of claim 5 , wherein at least one retention member is made of a different material which is softer than the other retention members in the set.
7. The assembly of claim 4 , wherein the barb has an inner diameter and the heads are at least partially spherical and have a maximum diameter greater than the inner diameter of the barb, the maximum diameter surface portion of at least a first retention member is a smooth, uninterrupted convex outer surface and one or more other retention members in the set have a maximum diameter surface portion which has a series of spaced flattened portions configured to provide a reduced retention force relative to the first retention member when the maximum diameter outer surface portion engages the barb.
8. The assembly of claim 4 , wherein the heads are of different colors corresponding to different amounts of retention force.