Page 380 - My FlipBook

378 RESTORATION OF TEETH BY CEMaNTED INLAYS.

smooth, and where they arc approximal there must be sufficient separa-
tion to allow the metiillic matrix, or mould, to be withdrawn without

Fig. 359.

A, Outline of labial cavity ; B, platinum foil large enough to be readily held immovable by the
first and second fingers during the formation of the matrix.
distortion, as success is impossible with a distorted matrix. The final
polishing can be best accomplished with a set of diamond points (Fig. 352).
Fig. 360.

A, Outline of cavity in distal aspect of lateral incisor : B, platinum folded over cutting edge to
insure immobility and to give outlines of tooth so that a perfect contour of porcelain may be
obtained.
The separation may be obtained with rubber, cotton, or tape. Approx-
imal cavities between front teeth may be sometimes advantageously cut