The procedure of
pouring the primary and secondary cats are the same, first the technician must
clean and disinfect the impression then apply a debubblizer to reduce the bubble
formation, when pouring the cast and a separator to allow the cast to come out
as it can be stuck on the impression causing the cast to break.
To pour the cast
first the plaster has to be prepared, the mixture used was 50 ml of water and a
50/50 mixture of plaster of paris and kaffir D stone and then steered to a
consistent cream, some may prefer other gypsums, often a 50/50 mixture is used
to reduce costs.
After the
impression is placed on the vibrator, then the plaster can be poured slowly filing
all the impression, after the based is poured in flat surface covered with
paper, the filled impression is turned over to join the base, the excess of
plaster has to be cut of with a plaster knife forming a nice rounded shape
around the base.
Then it can be let to set for about 30 to 40
minutes before the cast can be removed and trimmed
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