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1 Physical Research Laboratory, School of Dentistry, University of Michigan, Ann Arbor, Mich.
Little effort has been made at this time to correlate completely all of the basic design factors of the bur with its relative effectiveness and resistance to dulling. Some correlations appear quite evident, however, and in general, the burs with the more negative rake angle seem to be the least effective in their cutting action. At the same time, they appear to resist dulling to the greatest degree. While it is recognized that numerous other factors enter into the consideration of both cutting effectiveness and dulling, it is believed that the basic design of the bur is of great significance and more study is being given to this problem.
Submitted on March 28, 1953
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