The first letter of each bur type is underlined. These four letters, in order, spell
"RIST." This key word will help you learn the burs in increasing numerical
Figure 2-2. Bur shapes.
The second identifier is the number:
1 10 series--(Round bur)
2 30 series--(Inverted cone bur)
3 500 series--(Straight crosscut fissure bur)
4 700 series--(Tapered fissure bur)
(d) The fourth is the hand piece attachment. Burs are attached to one of
three hand pieces. To establish which hand piece a bur is used in, you may look at the
end away from the working end, as illustrated in figure 2-3.
(e) Any of the independent factors describing burs may be combined
when designing a bur. Obviously, the use and series numbers correspond with the name
or shape of the bur. However, any shape bur may be made of either of the two materials
and it may be made to fit into any of the three types of hand pieces.