Page 51 - My FlipBook

CUTTING INSTRUMENTS. 19

Enamel hatchet,
Push scaler,
Pull scaler,
Molar clamp, etc.
Class names are descriptive of the working point of the
instrument.
Examples: Hatchet, see Figure 22.
"
Hoe, " 22.
Spoon, " " 22.
Discoid, " " 23.
Cleoid, " " 23.
Serrated i)lugger,
Smooth plugger, etc.
These are also used as pi-efixes to order names, as in the
last two; and also as in hatchet excavator, hoe excavator, etc.
Sub-class names descrihe the shape of the shank of the
instrument.
Examples : Mon-angle,
Binangle,
Triple-angle,
Quadrangle,
Contra-angle,
Bayonet, etc.
These names are often combined for more complete descrip-
tions of the instruments named, thus : Mon-angle excavator,
or, mon-angle hatchet excavator, binangle spoon excavator,
contra-angled enamel hatchet, etc. In these combinations each
name is descriptive of some part of the instrument or of its
uses. In general, however, those descriptive of the shank are
omitted.
Order names and sub-order names are sufficiently defined
above, but class names and sub-class names need further defini-
tion and description.

class names of excavators.
ILLUSTRATIONS: FIGURES 22-23.
Hatchet. The shank has one or more angles or curves, the
last length forming the blade, the flat sides of which are in the
plane of the angle or angles, or, if the blade were at an angle of
25 centigrades with the shaft, the cutting edge would be parallel
with the shaft.
IIoE. The shank has one or more angles, the last length
forming the blade, the flat sides of which are in a plane inter-