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Quintessence Publishing: Journals: IJP
The International Journal of Prosthodontics

Edited by George A. Zarb, BChD, DDS, MS, MS, FRCD(C)

ISSN 0893-2174

Publication:
November/December 1998
Volume 11 , Issue 6

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The Machining of Cobalt-Chromium Alloy in Partial Denture Construction

Xenodimitropoulou/Radford

Pages: 565-573
PMID: 10023219

Purpose: To investigate the performance of different rotary instruments when machining cobalt-chromium alloy. Materials and Methods: One tungsten carbide bur, 1 diamond bur, and 2 aluminum oxide abrasive points (pink stones) of different diameter were used to machine cobalt-chromium alloy under standardized conditions. The rate of metal removal was determined and the resulting surfaces and bur wear were investigated using scanning electron microscopy and energy dispersive analysis. Results: Although the larger diameter pink stone was shown to be the most efficient instrument, the tungsten carbide bur produced the smoothest surface. Conclusion: Because of its low cost and high cutting efficiency, the pink stone is well suited for laboratory use. The tungsten carbide bur is the preferred instrument for clinical use.

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