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SILICATE IN THE MAKING OF A FILLING 163
volves the occlusal or incisal surfaces. In case the filling is found
to strike the apposing teeth, the excess should be ground off with
fine carborundum wheels, and again varnished. It is entirely safe
to use carbon paper to print these fillings, the same as with gold
or amalgam and its use will not cause discoloration of the filling.
The instruments used in reducing the size of silicate fillings should
be the same as when reducing the bulk of a gold filling. The
manufacturers of some of the silicates advise not to use any steel

Fig. 104. Fig. 105.
Fig. 104.—Three cavities suitable for silicate fillings.
Fig. 105.—This shows the results obtained after filling with silicate the cavities shown in
previous figure.
instruments in the finishing of these fillings, but clinical experi-
ence has proved that any injury which can result is not due to the
instruments, but to their unclean condition.
Facing Metal Fillings with silicate is many times of advantage
and is at this time the only method Avherein it is advisable to use
silicate in connection with angle restoration in Class Four fillings.
This will be more fully discussed in Chapter XXVIII dealing with
Combination Fillings. (See Figs. 106, 107 and 108.)