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374 RESTORATION OF TEETH BY CEMENTED INLAYS.
The Porcelain Inlay.—The work of manufacturing and manipu-
lating porcelain inlays remains to be considered.
Pieces of porcelain matching the natural tooth have, in times past,
been ground to fit the cavities and then held in position with cement.
This class of work, however, is hardly feasible except in labial cavities
on the surfaces of the front teeth. An excellent method for obtaining

Fig. 347.

a /; C it t
a, Defect at gingival margin ; 6, cavity prepared ; o, mark of edge on tin foil ; d, tin foil cut out
and glued to artificial tooth e, piece of porcelain ground and cemented into the cavity.
;
good adaptation is to proceed as follows A piece of tin-foil should be
:
lightly burnished over the prepared cavity, as in Fig. 347, 6, and the
edges thoroughly outlined either with a burnisher or a plug of cotton
lightly pressed into the cavity, making the foil appear as in Fig. 347, c.

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Porcelain cavity stoppers.
The foil within the line of demarkation is then cut out and glued to
the surface of a piece of porcelain that matches the tooth, as in Fig.
347, d, the porcelain is ground away up to the edges of the tin on all
sides, and a moderately good fit is thus secured (Fig. 347, e). This
method, however, is superseded by recent discoveries ; but for those
who are interested historically Fig. 347, illustrating the steps of the
operation, may prove of value. Ready-made porcelain inlays have been
kept in stock for years at the dental depots. These stoppings are of
different shapes and sizes, and are intended to be ground to fit the cav-