Amann Girrbach girobond nbs Instrucciones De Uso página 30

PROCESS STEPS IN THE DENTAL LABORATORY
For vacuum pressure-casting machines:
▷ Melt-up alloy without vacuum.
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Set the model casting program and switch off the vacuum or reduce
it as far as possible.
▷ When the last casting cube has joined the molten material and the
molten material tears apart and the surface is glossy: Initiate cast-
ing process.
▷ After the casting, allow the investment ring to slowly cool in the air.
Divesting / Finishing
▷ Blast off with 110 – 250 μm aluminium oxide.
▷ Cut off the casting channels with a cutting disc.
▷ Rework the frame using a cross-toothed carbide cutter.
Metal treatment before ceramic veneering
▷ Thoroughly blast off the frame with a fine-blasting unit using pure
110 – 250 μm aluminium oxide at a pressure of 3-4 bar.
▷ Grasp the frame with artery forceps; do not touch with fingers.
▷ Steam off frame with steam cleaner.
▷ If necessary, carry out oxide firing for surface inspection at
1040 °C with 1 – 2 min holding time. Afterwards, thoroughly blast
off again (see above).
Possible frame damage through improper handling!
▷ Do not blow frame dry with compressed air (oil, debris).
▷ Do not place frame into hydrofluoric acid.
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