J Bolt
OwnerJohn Jacklichinventor
Life of this patent
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Abstract
A threaded device is provided which can be screwed into the tooth root of a broken tooth to aid in the attachment of a crown or similar prosthesis. The threaded device has a head which is in the shape of a spherical segment of less than a hemisphere which holds a retention ring, a shim, and in some embodiments a coping dish whereby the device of the present invention can be screwed into a threaded hole in the tooth, a dental cement applied thereto and a crown or other prosthesis applied over the head of the bolt and retention ring. In a preferred embodiment of the invention, the retention ring is in the form of a spherical segment which is complementary to the spherical segment of the head to provide a complete spherical head.
Claims5
A device for holding a dental prosthesis such as a crown comprising in combination:
- a. a threaded shaft adapted to screw directly into a prepared threaded hole in a tooth,
- b. a head on said shaft, said head being a spherical segment of less than a hemisphere,
- c. a thick bulbous retention ring fitting over said shaft, said retention ring having a diameter larger than said head and having a top surface complimentary to the bottom surface of said head,
- d. a shim mounted on said shaft under said retention ring said shim having a smaller diameter than said head,
- e. a coping dish having a concave side and a convex side and having a diameter larger than said head mounted on said threaded shaft,
- f. said threaded shaft extending through said retension ring, shim, and coping dish whereby the concave side of said coping dish can lie on the surface of a prepared tooth with the threaded shaft extending into said tooth.
Dependencies are inferred from the claim text.