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The machining of cobalt-chromium alloy in partial denture construction
G Xenodimitropoulou1, D R Radford
1Division of Prosthetic Dentistry, Guy's, King's and St Thomas' Dental Institute, University of London, United Kingdom.
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.