A
large percentage of time and effort spent in
fabricating fixed prostheses is devoted to producing a very accurate wax pattern. From this
pattern, the finished cast restoration is duplicated by
using the lost-wax process as part of the indirect
procedure.
This technique consists of obtaining an accurate
impression of the prepared tooth (Fig. 18-1A) and
making a cast from the impression (Fig. 18-1B) on
which a wax pattern that resembles the shape of the
final restoration is shaped (Fig. 18-1C). A mold is
then made around the wax pattern with a refractory
investment material (Fig. 18-1D). When the investment has set, the wax is vaporized in an electric
furnace. The hollow mold is then filled with molten
casting alloy, reproducing every detail of the wax
pattern (Fig. 18-1E). The metal casting is retrieved,
excess metal is removed, and after polishing, the
cast restoration is ready for clinical evaluation (Fig.
18-1F).
A
large percentage of time and effort spent in
fabricating fixed prostheses is devoted to producing a very accurate wax pattern. From this
pattern, the finished cast restoration is duplicated by
using the lost-wax process as part of the indirect
procedure.
This technique consists of obtaining an accurate
impression of the prepared tooth (Fig. 18-1A) and
making a cast from the impression (Fig. 18-1B) on
which a wax pattern that resembles the shape of the
final restoration is shaped (Fig. 18-1C). A mold is
then made around the wax pattern with a refractory
investment material (Fig. 18-1D). When the investment has set, the wax is vaporized in an electric
furnace. The hollow mold is then filled with molten
casting alloy, reproducing every detail of the wax
pattern (Fig. 18-1E). The metal casting is retrieved,
excess metal is removed, and after polishing, the
cast restoration is ready for clinical evaluation (Fig.
18-1F).
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