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TOILET OF THE CAVITY 47
but the acid of tooth decay will easily exchange places with such
films.
If the cleaning has been fairly well done, it may result only in
what is termed "blue margin."
When time intervenes between cavity preparation and the mak-
ing of the filling, as from one sitting to another, the walls and mar-
gins should be retrimmed to give fresh cut surfaces to fill against.
This is not possible in the making of inlays as to retrim the mar-
gins destroys the fit. The fact that many times we cannot place
the inlays against surfaces which have been freshly cut constitutes
the greatest enemy to their permanence.
It is the one great argument that inlays should be made at one
sitting and under dry conditions.
Oonclusion. All fillings should be made against clean, freshly
cut walls.
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