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MAKING AND SETTING OF A GOLD INLAY 113
lay long before he is able to understand and successfully bring
to bear many of the qualities of cohesive gold.
.
Method Using Pattern Entirely of Wax. The cavity should be
prepared as for any other metal filling except that the retention
form should be omitted. In case decay has so left the cavity that
it is naturally retentive by having excavated undercuts these should
be filled with some substance which does not become a part of
the pattern, and which is easily removed before setting the in-
lay. The substances used to temporarily remove the retentive
form, are cement, temporary stopping, modeling compound and
wax, the preference being with the Avax.
This wax should be of a decidedly different color than that of
M'hich the pattern is made. (See Fig. 72.)

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Fig. 72.—Large restoration in non-vital case. Part of the pulp chamber has been filled
with black wax to remove undercut caused by pulp removal. The weak buccal wall has been
covered with the same material to protect it from stress from within when setting the inlay.
It goes without saying that this wax is all removed before setting the inlay and is therefore
replaced with the cement with which the inlay is set.
The Filling of the Undercuts should be made to dry cavity
walls, and with the wax quite warm to insure its adhering, that
it may not leave the walls to distort the pattern. The difference
in the color of Avax used will cause the detection of any particles
v.'hich may adhere to the pattern and make their removal easy.
By a little study and the judicious use of the above method
much cutting for convenience form may be obviated and many
seemingly difficult cases rendered quite simple.
The Making of the Pattern. After the retentive form has been
removed, the cavity should be flooded with water of ordinary
temperature. This will render the Avax Avithin the cavity suffi-