Page 97 - My FlipBook

CHAPTER XVI.

MANAGEMENT OF CAVITIES IN THE GINGIVAL THIRD.
(CLASS FIVE.)

Gingival Third Cavities Differ from all other cavities in the teeth
ill that they originate on perfectly smooth surfaces generally with-
out flaw in enamel formation and without covering of any kind, or
to state it more concisely, there seems to be no predisposing cause.
Their Prevention is an easy matter, as the accumulation of sordes
which is the sole exciting cause, is unprotected and of easy access to
the brush so that patients Avith this class of decay are paying the

A B
Fig. 54.— Cavities Class Five for cohesive gold or amalgam.

penalty for the careless neglect of the simplest forms of oral cleanli-
ness. With these facts before us it becomes the duty of every practi-
tioner to fully advise the patients of the neglect of their mouths in
this particular locality, in an effort to check farther destruction.
The Tendency to Spread in the Enamel is a characteristic of this
class of cavities. They usually originate near the center of the
buccal surface near the free margin of the gum and seldom stop
until they have extended both mesially and distally nearly to the
angles. The fact that the encroachment seldom reaches the angle
in the external enamel decay, is a point to be considered in the
93