Boxing and Pouring Master Impression
Goals of fabricating Master cast:
-accurate, dense, strong
-preserve peripheral border contours of edentulous master impression
-facilitate subsequent clinical and laboratory procedures
What type of dental stone is used to making master cast?
Type III dental stone
= "Microstone"
What's an advantage of using Microstone when used in fabrication of Master
cast?
-sufficient strength to resist alteration/ damage during subsequent steps
-not overly difficult to remove from dentures after denture base polymerization
, Boxing an impression involves:
enclosing the master impression by building vertical walls around impression
2 most common methods of boxing edentulous master impressions:
1. WAX boxing method
2. Plaster and pumice boxing method (what we used)
What's the difficulty involved in boxing master impression w/ wax instead of
plaster and pumice?
Wax doesn't adhere well to rubber base or silicone master impression
material.
Base around edentulous master impression is usually made of :
Vertical walls around edentulous master impression is usually made of :
Base - wax or plaster+pumice
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