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 and #34S.
- 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.
- 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.Continue Reading