Dental / Metal Milling Burs
Configuration & Function

Series #2 Metal Milling Burs

Metal Milling Burs come in a wide range of sizes and configuration, recognizing the differences is the first step in evaluating the correct one to use to produce the desired results.

Click:  For a download of a Bur configuration Wall Chart

 

   #1                Single Cut

 On a single cut bur all the flutes spiral in the same direction, generally this configuration produces  less aggressive cutting action and leaves a smoother finish.
 The bur in (fig. 1) is a straight side (no-tapered), flat end (no-radius), with no end cut.

  #2               Double Cut

 On a double cut (diamond-cut) bur there are additional flutes spiraling in the opposite direction, generally this configuration produces a more aggressive cutting action i.e., the crisscross pattern provides a chip breaking feature that produces finer chips increasing its efficiency, the finish may however  be rougher than the single cut.

 

  #3                  Flat End

  The flat end of a bur can be configured without Flutes (Fig. A) or with flutes (Fig. B). Having flutes on its end will allow the bur to perform milling using only the bottom of the bur additionally it can be used to plunge mill i.e., somewhat similar to drilling (will be shown on another page).

  #4                Radius End

 The end of a bur that is rounded (Fig. 4) is called a radius end and the flutes (single or double cut) extend around the radius. This bur can create a chamfer at the bottom of the cut ( will be shown on another page) it can also be used to plunge mill. 

  #5             Tapered  Bur

  The sides of a tapered bur typically vary from 2 to 10 degree.
They can be single or double cut (Fig. 5) shows a single cut.
The angle is calculated using only one side i.e., 1/2 the "total" angle of the bur (sometimes called a line angle or a half angle).

Burs used in photographs are for illustrative purpose.

Series #3 Milling Machines