Fig. (1) Photographs of non-contact varnish specimens contained
in stoppers with varnish applied to acrylic rods before (a) and after
(b) each of the three daily inverted immersions in distilled water. In
each photograph, the acrylic rods are on the left-hand side, while
the dentin specimens are embedded in separate acrylic rods on the
right-hand side. The varnished acrylic rods are removed from the
stopper during acid challenges and overnight immersions in the
artificial saliva mineral mix.