Fixed hybrid dental attachment assembly and methods of use

1. A dental attachment assembly, comprising:

an abutment member with a first end shaped to attach to a tooth root, implant or adjacent tooth, and a second end with an outer locating surface, wherein the outer locating surface of the abutment member has at least two axially spaced retention portions comprising two generally rounded, annular projections;

a first retention member having a first end and a continuous, unbroken skirt extending from the first end defining an inner surface for fixed, non-patient removable engagement over the outer locating surface of the abutment member, the retention member being constructed from a rigid material such that it provides a retentive force of about 10 to 75 pounds, such that upon engagement over the outer locating surface of the abutment member, the retention member is non-patient removable from the abutment member, wherein the first retention member has at least two axially spaced, snap engaging formations on the inner surface of the skirt for snap engagement with the respective retention portions of the abutment member, and wherein the axially spaced, snap engaging formations on the inner surface of the skirt comprise two spaced, annular grooves for snap engagement over the annular projections on the abutment member, and wherein the rigid material comprises polyetheretherketone (PEEK); and

wherein the abutment member is sized and dimensioned for engagement with a second retention member made of a more resilient material than the first retention member and having a second end and a continuous, unbroken skirt extending from the second end defining a second inner surface for patient removable engagement over the outer locating surface of the abutment member,

a cap with a rounded, concave inner surface defining a cavity to receive the retention member; wherein the cap is configured for securing in a dental appliance.

2. The dental attachment assembly of claim 1 , an interior top surface of the cavity includes a concave recess extending radially along an outer periphery of the interior top surface of the cavity.

3. The dental attachment assembly of claim 2 wherein a curve of the concave recess continues along a side wall of the rounded, concave inner surface defining the cavity.

4. The dental attachment assembly of claim 3 , wherein the concave recess curves at a plurality of varying angles along the side wall and the interior top surface of the cavity.

5. The dental attachment assembly of claim 3 , wherein the concave recess is composed of a series of consecutive tangent circular arcs.

6. The dental attachment assembly of claim 5 , wherein the series of consecutive tangent circular arcs increase in size from the interior top surface to the bottom portion of the cap.

7. The dental attachment assembly of claim 5 , wherein the series of consecutive tangent circular arcs are comprised of circles of increasing size from a top portion of the cap to a bottom portion of the cap.

8. The dental attachment assembly of claim 2 , wherein the concave recess provides a first retention member with an angle correction of up to 30 degrees.

9. The dental attachment assembly of claim 1 , further comprising a central portion of the interior top surface which protrudes vertically into the cavity.

10. The dental attachment assembly of claim 9 , wherein the first retention member is in direct contact with the central portion of the interior to surface.

11. The dental attachment assembly of claim 1 , wherein an outer diameter of the cap is 5.4 millimeters (mm) and a height of the cap is 2.3 mm.