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CAVITY LINING IN RESPECT TO PROXIMITY OF THE PULP. 259

zinc phosphate, since it has the required strength and enters into the
necessary adhesive union with the margins to give the required secur-
ity. The layer should be kept within the extreme outer border of the
cavity, to permit the metal filling to overlay the margin of the enamel.
When the cavity is deep the retaining groove may be formed in the
cement.
A general summary of cavity lining is, that this procedure is required
in proportion to the difficulty of effective approach, and for the safe
treatment of teeth below the average of structural quality.