In the last case, the tooth is usually an
underdeveloped third molar. The elevators are
actually levers. The fu lcrum (support point) for the
elevator is usually the bone supporting the tooth.
STRAIGHT ROOT ELEVATORS.The
elevators composing the straight working end group
are the #301 and the #34S (figs. 5-19 and 5-20). The
Figure 5-19.Root elevator #301.
Figure 5-20.Root elevator #34S.
working ends are in line with the handle and have a
concave surface. The #301 has the smallest working
end and is used when roots are deeply seated. The
#34S has the largest end and is commonly used for
anterior roots. The #92, shown in figure 5-21, also has
a straight working end; however, it is serrated and the
shanks are angled rather than straight as in the #301
SPADE/WEDGE-TYPE ROOT ELEVA-
TORS.Another style of elevator has spade or
wedge-type working ends. The Stout #11 (fig. 5-22)
and the Cogswell A (fig. 5-23) are examples of this
style. The Cogswell B, also shown in figure 5-23, is a
pick-shaped root elevator that has a working end
shaped similar to a rounded toothpick tip.
ANGLED-TYPE ROOT ELEVATORS.In
several sets of elevators, the handles are in line with the
shank, but the working ends are set at an angle. The
Figure 5-21.Serrated root elevator #92.
Figure 5-22.Stout #11 root elevator.