Page 28 - My FlipBook

24 THE TECHNICAL PROCEDURES IN FILLING TEETH.

walls and margins that can not be removed in this way. It is
not well to wash this with any known liquid, for even with the
use of pure alcohol, and after drying with the air syringe, some-
thing will be left coating the walls which injures them for the
purposes intended. The best thing yet devised is thorough
wiping, or sweeping, of all parts of the cavity with absorbent
cotton or with bits of punk held in the pliers. This should be
well done and then the cavity is ready for filling.
Rule : No moisture of any kind whatever should
enter a cavity after the last of the cutting is done, and if
by any accident a portion of the cavity should become
w^et, it should be dried thoroughly and then that portion
that has been damp should be freshened by cutting away
the surface.

Instruments and Instrumentation.
The cutting instruments required for preparing cavities have
been adopted after long and careful study of the needs of stu-
dents in school work. The set has been arranged especially
with reference to teaching methods of preparing cavities, and
for facilitating the actual work. It is such as will be best in
learning to do these difficult operations, and it is to this end
that they are adopted.
Each of the names we apply to instruments has a definite
meaning. They are descriptive of the uses, as excavator, plug-
ger, separator, or the manner of use, as hand plugger. They
describe the form of blades of cutting instruments, as hatchet,
hoe, spoon, or they describe the form of the shank, as contra-
angle, bin-angle, cow's-horn plugger.
Note here especially that there are four classes of names.
First, those which denote the purpose, which we call order
names, as plugger, excavator ; second, those which denote
position or manner of use, sub-order names, as hand or mal-
let plugger, enamel hatchet ; third, those which describe the
form of point, class names, as hatchet, spoon ; and fourth,
those which describe the form of the shank, sub-class names,
as bin-angle, contra-angle, cow's-horn or spiral.
The names we apply to instruments are classified as follows :
Order names.
Sub-order names,