rotational position. The average linear displacement per revolution and length of cut does not depend upon the diameter of the bur. It follows that because the length of the cut is constant, the material removed will vary directly with the bur diameter as well as the tongue and mechanical energy that the power source required to supply. 9) Depth of engagement:As the depth of engagement decreases, the force intensity on each small portion of the bur tooth still cutting correspondingly increased according to the average displacement per flute should be increased. This increase is so great that the volume of material removed from by the shallow cut is more than the deeper cut. 10) Influence of load:Load signifies the force exerted by dentist on the tool head and not pressure or stress induced in the tooth during cutting. The force or the load is related to the rotational speed of bur of a given design. The exact amount of force exerted is not known but maximum of 1000 gm (2 pounds) for low rotational speed and from 60120 gm (2-4 ounces) at high rotational speed. 11) Influence of speed: The rate of increase in cutting at rotational speed above 30,000 rpm is greater than below this speed. However it has been found that at very high speeds 150,000 and above, the time required for the removal of the same weight of tooth structure is nearly same at still higher speed.
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