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COMPOUND CAVITIES. 287
When the cavity is two-thirds filled it is well to use a few pieces of
No. 20 cohesive foil, so that a dense surface may be given to the filling.
Such cavities may be classed among the simple ones, and Fig. 244.
present no difficulties except their inaccessibility (Fig. 244).
The operator should ever strive to conceal as much as pos-
sible the gold in the anterior part of the mouth, and when it
is possible he should preserve the labial wall intact. This
can often be done by cutting away a portion of the palatal
wall and by packing the filling almost entirely from the under
side of the tooth. Where a large portion of the approximal surface is
involved, the retaining hold for the filling must be had at the cervical
border and at the cutting edge. The first pieces of gold should be an-
chored in a groove or retaining pit near the cervix and the cervical
border made secure before any other portion of the cavitv is filled.
The beginner will ordinarily do better to start such fillings with cohesive
foil or AVatts' crystal gold. If the latter, he may then complete his
filling Avitli cohesive foil. Non-cohesive gold is rarely indicated in cav-
ities of this description.
The electro-magnetic mallet or the Bonwill mechanical mallet is well
adapted for packing such fillings.
Bicuspids and Molars.
Class H.—Cavities of medium size situated upon the mesial or dis-
tal surfaces of the bicuspids and molars and not involving the occlusal
surface may be filled after the same manner as small cav-
Fig 245
ities in the incisors or canines. Operators who are not in
the habit of using non-cohesive foil prefer starting such fill-
ings in a small undercut or retaining pit and filling through-
out with cohesive gold prepared either in narrow ribbons
,
Approximal ® -^ ^ _
bicuspid or looscly rolled cylinders (Fig. 245).
^"^'
Such fillings, because of their position, must be packed
largely by hand pressure, although the mallet may be used as the
filling approaches completion.
III. Compound Cavities.
Incisors and Canines.
Classes I and J. — JTesio-labial and disto-labial cay [ties in the incisors
and canines are usually best filled throughout with cohesive gold. Each
cavity independent of the others should have retentive shape, so that in
the event of one filling being displaced the other will remain intact.
As a rule it is better to fill the cavity on the labial surface first,
because the first pieces of gold are more easily anchored in an accessible
COMPOUND CAVITIES. 287
When the cavity is two-thirds filled it is well to use a few pieces of
No. 20 cohesive foil, so that a dense surface may be given to the filling.
Such cavities may be classed among the simple ones, and Fig. 244.
present no difficulties except their inaccessibility (Fig. 244).
The operator should ever strive to conceal as much as pos-
sible the gold in the anterior part of the mouth, and when it
is possible he should preserve the labial wall intact. This
can often be done by cutting away a portion of the palatal
wall and by packing the filling almost entirely from the under
side of the tooth. Where a large portion of the approximal surface is
involved, the retaining hold for the filling must be had at the cervical
border and at the cutting edge. The first pieces of gold should be an-
chored in a groove or retaining pit near the cervix and the cervical
border made secure before any other portion of the cavitv is filled.
The beginner will ordinarily do better to start such fillings with cohesive
foil or AVatts' crystal gold. If the latter, he may then complete his
filling Avitli cohesive foil. Non-cohesive gold is rarely indicated in cav-
ities of this description.
The electro-magnetic mallet or the Bonwill mechanical mallet is well
adapted for packing such fillings.
Bicuspids and Molars.
Class H.—Cavities of medium size situated upon the mesial or dis-
tal surfaces of the bicuspids and molars and not involving the occlusal
surface may be filled after the same manner as small cav-
Fig 245
ities in the incisors or canines. Operators who are not in
the habit of using non-cohesive foil prefer starting such fill-
ings in a small undercut or retaining pit and filling through-
out with cohesive gold prepared either in narrow ribbons
,
Approximal ® -^ ^ _
bicuspid or looscly rolled cylinders (Fig. 245).
^"^'
Such fillings, because of their position, must be packed
largely by hand pressure, although the mallet may be used as the
filling approaches completion.
III. Compound Cavities.
Incisors and Canines.
Classes I and J. — JTesio-labial and disto-labial cay [ties in the incisors
and canines are usually best filled throughout with cohesive gold. Each
cavity independent of the others should have retentive shape, so that in
the event of one filling being displaced the other will remain intact.
As a rule it is better to fill the cavity on the labial surface first,
because the first pieces of gold are more easily anchored in an accessible
