Contoured dental posts

Details

Inventors: Weissman, Bernard;
Assignee: IPCO Corporation (White Plains, NY)
Primary Examiner: Peshock; Robert
Assistant Examiner:
Attorney, Agent or Firm: Helfgott & Karas

A dental post for securely retaining a dental restoration on a prepared tooth stub. The dental post is formed of an elongated cylindrical pin having a longitudinal axis. Helical grooves are provided about the periphery of the pin for retaining the pin secured within a cement prepared bore within the tooth stub. An outer contour is formed along the longitudinal length of the pin to define annular retaining ledges axially spaced apart along the pin interspersed with inwardly tapered pin sections. The ledges serve to aid in the retention of the pin in the bore and increase the strength of the pin reducing the possibility of pin shear.

DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide an improved dental post.
A further object of the present invention is to provide a dental post having improved retention capabilities within a cement prepared bore within a tooth stub.
Still a further object of the present invention is to provide a dental post having a helically grooved periphery and a longitudinally contoured outer edge.
Still a further object of the present invention is to provide a dental post having a plurality of spaced apart ledges formed along the axial length of the post to provide improved retention within the cement in a bore of a tooth stub.
Another object of the present invention is to provide a dental post which has increased strength to avoid potential breaking or fracturing of the post along its length.
Yet a further object of the present invention is to provide a dental post which has greater resistance to dislocation of the post from the cement in a prepared bore in a tooth stub.
Another object of the present invention is to provide a dental post having helical grooves and annular ledges both of which are formed during a single rolling operation, which provides additional hardness to the dental post during the working of the post.
Briefly, in accordance with the present invention there is provided a dental post for securely retaining a dental restoration on a prepared tooth stub.
The dental post includes an elongated cylindrical pin with an elongated longitudinal axis.
Helical grooves are formed around the periphery of the pin for retaining the pin secured within a cement prepared bore in a tooth stub.
An outer contour is longitudinally formed along the peripheral edge of the pin to define annular retaining ledges radially positioned about the pin and axially spaced along the length of the pin.
These ledges further retain the pin secured within the bore and reduce the possibility of bending or breakage along shear lines of the pin.
In an embodiment of the invention, the helical grooves and the longitudinal contour are both formed during a rolling operation

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