Page 356 - My FlipBook

354 COMBINATION FILLINGS. —

a cavity in a central incisor tliat can be filled to advantage with cement
and gold. Fig. 335 shows a cavity in a central
Fig. 334. Fig. 335. incisor with the jinlp removed and but little of
the crown remaining hut the enamel. The greater
part of tlie cavity has been filled with cement into
which plastic gold has been put and condensed.
The filling can be completed with any cohesive
gold.
In compound cavities in molars and bicuspids,
lifter the cement and gold have been put in, as
o, a, Frail enamel walls-
b, gold surface made by
described for cement and amalgam A, and the
plastic gold condensed . t
^ ^ i j-, / -j i i ^ i -i
into cement. matrix adjusted, sojtjou can be used to great ad-
vantage at the cervical portion of the cavities, as
elsewhere described for using soft and cohesive golds.
Amalgam and Gold.
Gold may be used in combination with amalgam A, by allowing
the amalgam to become hard before adding the gold ; B, by adding
the gold while the amalgam is soft and finishing the filling at one sitting.
A. AUo-wing- the amalg-am to harden and then adding- gold at a
subsequent sitting will usually be done in compound cavities in bicus-
pids and molars, for the purpose, principally, of overcoming the dark
appearance of the amalgam. For instance, a filling involving the occlu-
sal and mesial surfaces of an upper first molar will, in many mouths,
show more or less, and, if of amalgam, be dark and unsightly. To
avoid this, the cavity may be nearly filled with amalgam, lea^ ing a
portion of the occlusal surface and along the buccal wall (tliis being the
part of the filling most likely to show) for completion with gold later.
The matrix should be used as described for cement and amalgam
fillings. It is a good plan to leave it in place, when convenient, until
the amalgam is hard. Before adding the gold, it should be ascertained
what part of the filling will show, and the amalgam trimmed and shaped
so that the gold may form that portion of the filling that will be in
sight. Fig. 336 shows a compound cavity in a molar partially filled with
amalgam. The amalgam has been left until hard and the filling is now
ready to be finished wdth gold. The figure also shows the cement
lining under the amalgam.
Suitable retaining places must be made in the amalgam to hold the
gold in position, as there is no union ])etween the two in this case, as
there is when gold is added to unset amalgam. The gold being added
makes a filling much superior in appearance to one entirely of amalgam.
The gold will also make a better wearing material for the masticating
surface, having better edge strength than the amalgam, and therefore