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COMBINATION FILLINGS 171

again by freshly cutting them with a chisel for their entire outline
and the amalgam filling immediately finished in the usual way.
The Benefits. This combination produces a filling with the vir-
tues of an amalgam to which is added the adhesion of the cement
and the protection of cavity wall from fracture and discoloration.
When Indicated. This is indicated in most large cavities to be
filled Avith amalgam, where the walls "are weak and thin and in
cavities where insufficient retentive form is secured.
Cement and Porcelain. Cement is combined Avith porcelain in
the filling of teeth for the purpose of making the filling adhere.
The porcelain protects the cement from dissolution.
Silicate Cement and Fused Porcelain. Fused porcelain inlays

• Fig. 106.—Combination gold inlay and silicate. A represents the gold inlay in position
ready to receive the silicate. B represents the same after the silicate has been put in place.

may be set with some of the silicate cements to great advantage.
The silicate filling materials Avhich are at their best when mixed
thin enough to be adhesive are those which can be used as a ce-
ment. In fact some operators are using these materials for setting
the gold inlay Avith seemingly good results.
Silicate and Gold. Silicate may be used to face the gold filling
for esthetic reasons. In filling Class Four cavities Avith the gold
inlay, by either one of the four plans, the Avax may be cut out of
the pattern so as to present a labial surface almost entirely of
silicate. After these tAvo materials are combined in this class of
cavity, care should be taken that the incisal edge is of gold and