Dentistry – Apparatus – Having static product shaping surface
Patent
1993-05-27
1994-08-30
O'Connor, Cary E.
Dentistry
Apparatus
Having static product shaping surface
433229, A61C 504
Patent
active
053421949
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.
REFERENCES:
patent: 3921299 (1975-11-01), Lazarus
patent: 4575805 (1986-03-01), Moermann et al.
patent: 4837732 (1989-06-01), Brandestini et al.
Fattibene Arthur T.
Fattibene Paul A.
O'Connor Cary E.
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