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Proceedings Paper

Computer-Assisted System to Automate Production of Posterior Dental Restorations
Author(s): E.Dianne Rekow; Arthur G. Erdman; T.Michael Speidel
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Paper Abstract

The feasibility of a system which is capable of automating production of posterior dental restorations has been investigated. Data acquisition can be accomplished in a clinical setting using standard equipment to obtain stereoscopic views of the prepared tooth, adjacent and opposing teeth, and the jaw in motion. Data from the patient is digitized with a very high resolution digitizer. Stereophotogrammetric reconstruction and kinematic analysis establish the three-dimensional envelope in which the restoration must function. Ideal tooth profiles have been digitized for each of the fourteen unique teeth. Each tooth profile is represented by B-spline or Bezier curves and surfaces. Utilizing local influence properties of these curves and surfaces, the ideal profile can be modified to provide proper function and fill the available space, yielding a morphologically correct restor-ation which meets the unique design requirements for a specific patient. Spline curves and surfaces also ensure that the surfaces are well behaved, without discontinuities. This property facilitates generation of tool paths for numerically controlled machining. The latest version of Control Data Corporation's ICEM-DDN package, with its interface with the newly developed graphics programming language (GPL) is used to create those tool paths. Special consideration is given to unique requirements of mating internal and external sur-faces as well as to high precision, small size manufacturing.

Paper Details

Date Published: 7 July 1986
PDF: 7 pages
Proc. SPIE 0602, Biostereometrics '85, (7 July 1986); doi: 10.1117/12.956314
Show Author Affiliations
E.Dianne Rekow, University of Minnesota (United States)
Arthur G. Erdman, University of Minnesota (United States)
T.Michael Speidel, University of Minnesota (United States)

Published in SPIE Proceedings Vol. 0602:
Biostereometrics '85
A. M. Coblentz; Robin E. Herron, Editor(s)

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