Multisensor Support of Computer-aided Dentistry

  • A. Mehl
  • W. Gloger
  • K.-H. Kunzelmann
Part of the Research Reports Esprit book series (ESPRIT, volume 1)


The possible benefits from the use of machine-processed work pieces in dentistry are numerous. Among them are the reproducible properties of bulk industrial material and feasibility of on-line quality control. For the production of an inlay, for example, the main problems are the acquisition of 3D-data from the cavity and the processing of this data set into an accurate description of a suitable work piece, which is to be sent to a CAM device. In this paper, we describe a possible realization of these concepts. 3D data can be obtained from one or more laser light-sectioning sensors, and be complemented with an ordinary video image from a CCD-camera. With a matching algorithm, several semi-3D views of the cavity from the LSS can be combined into a single truly three-dimensional data set, which has no defects due to shading any more. Using methods from classical image processing, relevant features of the data, in particular edges, are extracted and completed. Once the remaining parts of the chewing surface are so identified, its missing regions can be reconstructed with techniques from interpolation and finite element theory. A model of the inlay then results as the difference image between the completed and the originally measured surfaces. Examples of (intermediate) results of this design process are presented.


Difference Image Light Line Dental Technician Light Section Finite Element Theory 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. [1]
    N. Reuling, B. Pohl-Reuling, and M. Keil. Zur Gewebevertraglichkeit von Edelmetall-Dentallegierungen. ZWR, 100: 146–158, 1991.Google Scholar
  2. [2]
    K.H. Kunzelmann and R. Hickel. The machinability of different materials for CAD/CAM systems. NIST, 1993.Google Scholar
  3. [3]
    K.H. Kunzelmann, J. Sindel, and R. Hickel. Factors influencing the machinability of leucite-reinforced porcelain for CAD/CAM systems. In J. Dent. Res. Spec. Issue IADR, number 669, Chicago, 1993.Google Scholar
  4. [4]
    DENS, Inc. Information letter at dentechnica, Nuremberg, 1993.Google Scholar
  5. [5]
    A. Mehl, K.-H. Kunzelmann, A. Petschelt, and R. Hickel. Highly accurate 3D data acquisition with a light sectioning laser sensor. In J. Dent. Res. Spec. Issue IADR, number 1926, 1993.Google Scholar
  6. [6]
    J.C. Dainty. Laser speckle and related phenomena. Springer, 1975.Google Scholar
  7. [7]
    G. Hausler and W. Heckel. Light sectioning with large depth and high resolution. Appl Opt., 27 (4): 5165–5169, 1988.CrossRefGoogle Scholar
  8. [8]
    William H. Press, Brian P. Flannery, Saul A. Teukolsky, and William T. Vetterling. Numerical Recipes in C. Cambridge University Press, 1988.Google Scholar

Copyright information

© ECSC-EC-EAEC, Brussels-Luxembourg 1995

Authors and Affiliations

  • A. Mehl
    • 1
  • W. Gloger
    • 1
  • K.-H. Kunzelmann
    • 1
  1. 1.Department of University of MunichMunichGermany

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