Page 118 - My FlipBook

METHODS OF FILLING TEETH.
IO4
dismissed. At the next the dam was
phate and the patient sitting
removed to allow a
placed, and the phosphate sufficiently thorough
of Next a groove was cut between the porcelain face and
filling gold.
the tooth where they came into contact at the labial gum-margin,
was made 108 shows a
and this joint perfect by gold filling. Fig.
the relation between
section representing porcelain face, pin, phos-
and and Fig. 109 shows the appearance from the labial
phate, gold,
the porcelain face, and the at the
aspect, gold joint being seen.
CHAPTER V.

SPECIAL PRINCIPLES INVOLVED IN THE PREPARATION OF CAVITIES, AND
IN THE INSERTION OF FILLINGS CONSIDERATION OF APPROXIMAL CAVI-
TIES IN INCISORS IN CUSPIDS IN BICUSPIDS IN MOLARS.

IN the earlier portion of this work I have given what I termed
in relation to the preparation of cavities and the
"general principles"
thereof. I now purpose to take a sufficient num-
filling up specifically
ber of typical conditions, so that with the description of methods neces-
the student may have the theoretical knowledge which will enable
sary,
him intelligently to undertake whatever may come into his hands.
In the first chapter I classified cavities as being of three kinds, viz :
approximal, crown, and surface, the latter including palatal, lingual,
labial, buccal, and festoon cavities. Of these terms, all serve well
of the word "crown."
enough, with the possible exception Strictly
speaking a tooth is divided into crown, neck, and root, so that any cavity
' ' crown '
might be considered a cavity' provided it did not reach or pass
the neck. But this use of the word is arbitrary, for the common mean-
of "crown" is "the "the summit." Thus the
ing topmost part,"
"crown of the head" is the extreme upper surface. This latter appli-
cation of the term has been made by many when speaking of cavities in
the masticating surfaces of molars and bicuspids. In the absence of
a term
universally adopted applicable to this position, the words
crown cavity' in this work must be interpreted to mean a cavity in
' ' '
the masticating surface of a bicuspid or a molar.
Approximal Cavities. Of all cavities, those in the approximal sur-
faces usually demand the greatest skill and care. Situated most often
in a position inaccessible because of the contiguity of the adjacent
tooth, a spreading, or separation of the teeth, becomes necessary. Even
after this is done, it not infrequently occurs that what would be an
with ready access, becomes
easy filling exceedingly difficult because
of lack of space in which to work. Add to this the tenderness caused