Page 291 - My FlipBook
P. 291
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COMPOUND CAVITIES. 289
and build the gold squarely down as in classes M and N until the in-
cisal edge is reached, thence across the incisal edge, then fill the mesial
cavity after the same manner, uniting the three fillings at the mesio-
incisal corner. It is better to insert such fillings with an
electric or a mechanical mallet, as there is always dan-
ger, when packing across the incisal edge by hand pres-
sure, of pushing one or the other of the fillings out of
the approximal surfaces.
If no accident occurs in the packiiio- of the irold a Mcsio-distn-inoisai
hlhng thus made is very secure, tor its t staple and each portion helps to bind the others securely in the triple
cavity. Non-cohesive gold should form no part of such fillings (Fig.
249)."
Bicuspids and Mo/ars.
Ci^ASS P. Jlcsio-occlusal.—The filling of this class of cavities oifers
no serious difficulties provided sufficient space has previously been ob-
tained. As it is desirable to restore with gold the original outline of
the tooth, sufficient space to do this in is a necessity, and the operator
will soon learn that he can only accomplish good results in proportion
as he recognizes the inn)ortance of this preliminary.
The cervical border is the vulnerable point for recurrence of decay,
and imperfection here in the matter of packing the gold means speedy
failure of the filling, hence the importance of a perfect joint between
gold and tooth. This may be obtained by either non-cohesive or cohe-
sive gold if due care be exercised in its use. Where the cavity has not
great depth and the retaining grooves are also shallow^, no better method
of laying the cervical foundation can be adopted than by the use of
Watts' crystal gold or the "Velvet" cylinders, which possess great soft-
ness and some slight cohesive properties. If the operator has had
some experience in working non-cohesive foil he will do well to use a
mat of non-cohesive foil at this point, allowing the mat to extend some-
what beyond the cervical border of the cavity. This may be followed
by another mat or two, after which they should be malleted to place, a
foot-shaped plugger point being used. The upper third or even one-
half of the cavity may be filled after this method. He should then
begin the use of cohesive gold. The two kinds can be incorporated as
previously described and the filling completed with gold which has been
freshly annealed.
It is always better to insert too much rather than too little gold, as
the operator can shape the contour according to his fancy or to the
necessities of the case.
The occlusal portion of the filling should be thoroughly condensed,
19
COMPOUND CAVITIES. 289
and build the gold squarely down as in classes M and N until the in-
cisal edge is reached, thence across the incisal edge, then fill the mesial
cavity after the same manner, uniting the three fillings at the mesio-
incisal corner. It is better to insert such fillings with an
electric or a mechanical mallet, as there is always dan-
ger, when packing across the incisal edge by hand pres-
sure, of pushing one or the other of the fillings out of
the approximal surfaces.
If no accident occurs in the packiiio- of the irold a Mcsio-distn-inoisai
hlhng thus made is very secure, tor its t
cavity. Non-cohesive gold should form no part of such fillings (Fig.
249)."
Bicuspids and Mo/ars.
Ci^ASS P. Jlcsio-occlusal.—The filling of this class of cavities oifers
no serious difficulties provided sufficient space has previously been ob-
tained. As it is desirable to restore with gold the original outline of
the tooth, sufficient space to do this in is a necessity, and the operator
will soon learn that he can only accomplish good results in proportion
as he recognizes the inn)ortance of this preliminary.
The cervical border is the vulnerable point for recurrence of decay,
and imperfection here in the matter of packing the gold means speedy
failure of the filling, hence the importance of a perfect joint between
gold and tooth. This may be obtained by either non-cohesive or cohe-
sive gold if due care be exercised in its use. Where the cavity has not
great depth and the retaining grooves are also shallow^, no better method
of laying the cervical foundation can be adopted than by the use of
Watts' crystal gold or the "Velvet" cylinders, which possess great soft-
ness and some slight cohesive properties. If the operator has had
some experience in working non-cohesive foil he will do well to use a
mat of non-cohesive foil at this point, allowing the mat to extend some-
what beyond the cervical border of the cavity. This may be followed
by another mat or two, after which they should be malleted to place, a
foot-shaped plugger point being used. The upper third or even one-
half of the cavity may be filled after this method. He should then
begin the use of cohesive gold. The two kinds can be incorporated as
previously described and the filling completed with gold which has been
freshly annealed.
It is always better to insert too much rather than too little gold, as
the operator can shape the contour according to his fancy or to the
necessities of the case.
The occlusal portion of the filling should be thoroughly condensed,
19
