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CoCr Is Not the Same: CoCr-Blanks for Dental Machining

  • B. Karpuschewski
  • H. J. Pieper
  • M. Krause
  • J. Döring
Conference paper

Abstract

Modern computer-aided technologies for manufacturing of individual prostheses are gaining popularity in the dental technology. The CAD/CAM technology promises a material-oriented processing of the manufactured material blanks. Especially with the cast processing of metals to master the process is essential. The control of the casting process directly affects the material quality and thus the clinical chances of success. Possible errors in the casting process, such as gas cavities, scabs, bubbles and cast stresses lead to a significant deterioration in the quality of the material. With the industrial production of material in blank form and their industrial machining this problem should be avoided. But it was the machining of difficult to machine materials such as cobalt-chromium alloys which presents new challenges.

Due to the increasing cost pressures in the manufacturing of dentures, the milling technology users are forced to reduce milling time and extend tool life. To achieve this, the Institute of Manufacturing Technology and Quality Management of the University of Magdeburg made investigations for a possible optimal machining process. As a first step, mainly in the German market used cobalt-chromium alloys have been analyzed by a crystal structure and EDX analysis as well by a macro-and micro-hardness measurements. Aim is to identify the impact of tools, width and depth of cut, cutting speeds and the used cobalt-chromium alloy on both the manufacturing and the material quality after processing. The investigation raises fundamental questions for process safety, the material removal rate and the tool wear. Machining tests were carried out to determine the impact of different material compositions and how these affect the milling process.

Keywords

Tool Wear Material Removal Rate Tool Life Mixed Crystal Milling Tool 
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.

References

  1. 1.
    Williams DF (eds) (1981) Biocompatibility of Clinical Implant Materials. Vol.I, CRC Press, Boca Raton, Fla. USA, pp 9–13Google Scholar
  2. 2.
    Haynes E (1913) Alloys of cobalt with Cr and other metals. Trans. Am Inst Metall. Pet Eng 44:573–580Google Scholar
  3. 3.
    Haynes E (1913) Alloys of Cobalt with other Metals. J Ind Eng Chem 5:189CrossRefGoogle Scholar
  4. 4.
    Prange CH (1933) US-Patent 1909008Google Scholar
  5. 5.
    Prange CH (1938) US-Patent 2135600Google Scholar
  6. 6.
    Prange CH (1934) US-Patent 1958446Google Scholar
  7. 7.
    Smith-Peterson MN (1939) Arthroplasty of the hip: a new method. J Bone Jt Surg 21:269–273Google Scholar
  8. 8.
    Davis JR, ed. Metallic Materials, Chapter 3, in Handbook of Materials for Medical Devices, ASM International, Materials park, Ohio, USA, 2003.Google Scholar
  9. 9.
    Pilliar R.M.: Metallic Biomaterials, Chapter 2, in Biomedical Materials, USA, 2009Google Scholar
  10. 10.
    Park J., Lakes R.S.: Biomaterials: an introduction, Springer, New York, 2007, p.104–105Google Scholar
  11. 11.
    Ha S.-W., Wintermantel E., ed. Biokompatible Metalle, Chapter 11, in Medizintechnik Life Science Engineering, Springer, Berlin, 2009Google Scholar
  12. 12.
    Hanawa T., ed. Overview of metals and applications, in Metals for biomedical devices, Woodhead Publishing Limited, Oxford, 2010Google Scholar
  13. 13.
    Steinemann S.G., Corrosion of surgical implants – in vivo and in vitro tests, in Evaluation of biomaterials, Winter G.D., Leray J.L., de Groot K. (eds.), John Wiley & Sons Ltd., 1980, p. 1–34Google Scholar
  14. 14.
    Pilliar R.M., Manufacturing processes of metals: The porcessing and properties of metal implants, in Metal and ceramic biomaterials, 1, Ducheyne P., Hastings G.W. (eds.), CRC Press, Boca Raton, 1984, p. 79–105Google Scholar
  15. 15.
    Lindigkeit J.: Edelmetallfreie Legierungen, Dental-Kompakt 4, 2008, S. 40–42Google Scholar
  16. 16.
    Stümke M.: Einführung in die Metallkunde, in Zahnärztliche Werkstoffe und ihre Verarbeitung Band 1, Chapter 3, Eichner K., Kappert H. F.(eds.), Thieme Verlag, Stuttgart, 2005Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • B. Karpuschewski
    • 1
  • H. J. Pieper
    • 1
  • M. Krause
    • 1
  • J. Döring
    1. 1.Institute of Manufacturing Technology and Quality ManagementOtto-von-Guericke-University MagdeburgMagdeburgGermany

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