Creation of Master Casts for Denture Fabrication 10 Questions with complete solution 2024/2025

Creation of Master Casts for Denture
Fabrication 10/10
purpose of master cast fabrication
CREATE A CAST THAT PRESERVES THE ANATOMY CAPTURED BY
FINAL
IMPRESSION


INCLUDING PERIPHERY DETAIL AND THICKNESS


CAST HAS A FEATURE CALLED A "LAND AREA" THAT IS A 4-6MM WIDE
FLAT RIM AROUND THE ANATOMY OF THE CAST
- The land area is critical during processing of denture


PRODUCES A CAST THAT IS STRONG WITH DENSE STONE THAT CAN
WITHSTAND THE PRESSURES OF DENTURE PROCESSING AND IS NOT
EASILY DAMAGED DURING DENTURE FABRICATION


IDEALLY STONE MIXED UNDER VACUUM




methods of master cast fabrication
bead and box with wax


pumice and plaster (We used)

, bead and box method
apply layer of sticky wax around periphery of impression 3 mm below edge of
impression




beading
apply 2 lengths of rope wax around the periphery adhering the wax to the
previously placed sticky wax




boxing
surround the impression with a sheet of red boxing wax to form a container for
the stone. seal the waxes to each other with a hot instrument to prevent
leakage




mandibular impression bead technique
place sticky wax around periphery 3 mm below border of impression




beading of mandible
surround impression with 2 thickness (horizontal) of rope wax


to close the lingual space apply a layer of base plate wax to the area and seal
to impression


make sure the entire impression is surrounded by wax to create land area