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SYNTHETIC CEMENT 1 53
sistency. (5) For fillings, the mixing should be continued
until the cement materially resists spatulation, when it is
scraped from the slab, and in some instances rolled into a ball
ready for use. Directions accompanying the package specify
minute details of mixing silicates and other cements, these
varying to some extent, depending on chemical composition.
Method of Packing.—The cavity should be dry, with
slightly retentive form and bevel not marked. Pack in small
pieces, thoroughly condensing with as much force as the ma-
terial will allow, by means of smooth burnishers, leaving an
excess for polishing. As soon as the material is molded to
form, allow it to set thoroughly before removing the excess
and polishing. Trim and polish with knives, disks and strips.
The use of the matrix is a necessity in complex cavities, if the
best results are desired.
Hydraulic cements require the application of water after
molding to form, and before setting.
The manufacturers of De Trey's synthetic cement offer the
following instructions for the manipulation of this product.
Correct Technic for De Trey's Synthetic Porcelain
Prepare the cavity with undercuts as for a gold or an amal-
gam fining, but with margins square, not beveled. If, while
a new filling is being inserted, there are any older synthetic
fillings within the area which will be kept dry, these older
fillings must be protected against desiccation. Coat them
with Caulk Cavity Lining or Synthetic Varnish.
Assemble all accessories: stellite, tantalum, ivory, agate
or glass instruments for placing; stellite, agate, or glass
spatula for mixing; celluloid strips; cocoa butter; cavity
lining; heavy glass slab.
Wipe the slab and the spatula with grain alcohol. In hot
weather chill the slab to 65 or 70° F.
j
sistency. (5) For fillings, the mixing should be continued
until the cement materially resists spatulation, when it is
scraped from the slab, and in some instances rolled into a ball
ready for use. Directions accompanying the package specify
minute details of mixing silicates and other cements, these
varying to some extent, depending on chemical composition.
Method of Packing.—The cavity should be dry, with
slightly retentive form and bevel not marked. Pack in small
pieces, thoroughly condensing with as much force as the ma-
terial will allow, by means of smooth burnishers, leaving an
excess for polishing. As soon as the material is molded to
form, allow it to set thoroughly before removing the excess
and polishing. Trim and polish with knives, disks and strips.
The use of the matrix is a necessity in complex cavities, if the
best results are desired.
Hydraulic cements require the application of water after
molding to form, and before setting.
The manufacturers of De Trey's synthetic cement offer the
following instructions for the manipulation of this product.
Correct Technic for De Trey's Synthetic Porcelain
Prepare the cavity with undercuts as for a gold or an amal-
gam fining, but with margins square, not beveled. If, while
a new filling is being inserted, there are any older synthetic
fillings within the area which will be kept dry, these older
fillings must be protected against desiccation. Coat them
with Caulk Cavity Lining or Synthetic Varnish.
Assemble all accessories: stellite, tantalum, ivory, agate
or glass instruments for placing; stellite, agate, or glass
spatula for mixing; celluloid strips; cocoa butter; cavity
lining; heavy glass slab.
Wipe the slab and the spatula with grain alcohol. In hot
weather chill the slab to 65 or 70° F.
j
