Richard L Feldman

US Patent:

52482588, Sep 28, 1993

Filed:

Jun 3, 1992

Appl. No.:

7/893061

Inventors:

Richard L. Feldman - Easton CT

International Classification:

A61C 504
A61C 510

US Classification:

433 39

Abstract:

This disclosure is directed to a dental imaging matrix band and a method for making a dental prosthetic restoration such as a 3/4 crown, full crown, or fixed bridge with the use of a CAD-CAM machine. This is attained by encircling a tooth or teeth prepared for receiving a 3/4 crown, full crown or fixed bridge restoration by a matrix band having an enlarged beaded peripheral edge or lip which can be optically read by a scanner of a CAD-CAM machine. The optical image of the tooth or teeth and the encircling matrix band is transformed by the CAD-CAM machine into a signal which controls the operation of the forming or milling portion of the CAD-CAM machine to shape a block of dental material into the shape of a 3/4 crown, full crown or fixed bridge to be fitted to the prepared tooth or teeth in accordance with the optical image of the prepared tooth or teeth. The matrix band is defined by a strip of thin non-reflective metallic material having a longitudinal edge thereof defining an enlarged bead which can be optically scanned by a CAD-CAM machine; the image of which being transformed into a signal enabling the CAD-CAM to machine a 3/4 crown, full crown or fixed bridge to be received by the prepared tooth or teeth.

US Patent:

53421949, Aug 30, 1994

Filed:

May 27, 1993

Appl. No.:

8/067819

Inventors:

Richard L. Feldman - Easton CT

International Classification:

A61C 504

US Classification:

433 39

Abstract:

This disclosure is directed to a dental imaging matrix band for making a dental prosthetic restoration such as a 3/4 crown, full crown, or fixed bridge with the use of a CAD-CAM machine. This is attained by encircling a tooth or teeth prepared for receiving the prosthetic restoration by an imaging matrix band having an actual enlarged beaded peripheral edge or an illusion of an enlarged beaded portion which can be optically read by a scanner of a CAD-CAM machine. The optical image of the tooth or teeth encircled by such an imaging matrix band is transformed by the CAD-CAM machine into a signal which controls the operation of the forming or milling portion of the CAD-CAM machine to shape a block of dental material into the shape of a prosthetic restoration to be fitted to the prepared tooth or teeth in accordance with the optical image of the prepared tooth or teeth. The matrix band is defined by a strip of thin non-reflective metallic material having a longitudinal edge thereof defining an enlarged bead or a thickened buccal and lingula side portions which can be optically scanned by a CAD-CAM machine; the image of which being transformed into a signal enabling the CAD-CAM to machine a prosthetic restoration to be received by the prepared tooth or teeth. In another form, the matrix band is formed of a uniform thickness which extends beyond the surface of the tooth and which is tapered outwardly to define an optical illusion simulating a thicker occlusal end which can be read by the CAD-CAM machine.