Ch. 10 Master Casts Questions with complete solution 2024/2025
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BOXING AND EXPRESSION
Institution
BOXING AND EXPRESSION
Ch. 10 Master Casts Questions with complete solution 2024/2025 Ch. 10 Master Casts
What is the principal constituent of both dental plasters and dental stones? - correct answer calcium sulfate hemihydrate
How do dental plasters and dental stones differ? - correct answer Dental plaster is...
Ch. 10 Master Casts
What is the principal constituent of both dental plasters and dental stones? -
correct answer ✔calcium sulfate hemihydrate
How do dental plasters and dental stones differ? - correct answer ✔Dental
plaster is the beta-form of calcium sulfate hemihydrate; fibrous aggregate of
fine crystals with capillary pores that are irregular in shape and porous in
characte
Dental stone is the alpha-form of calcium sulfate hemihydrate; cleavage
fragments and crystals in the form of rods or prisms.
ifferences between the alpha-form and the beta-form of calcium sulfate
hemihydrate are results of differences in crystallite size, surface area, and
lattice perfection. The alpha-form of calcium sulfate hemihydrate is composed
of regularly shaped grains with low porosity and requires less water for a
satisfactory mix than the beta-form of calcium sulfate hemihydrate. Therefore,
the alpha form of calcium sulfate hemihydrate is denser than the beta-form
and has physical properties superior to the beta-form.
What is the basis for the classification system used in the American Dental
Association specification for dental gypsum products? - correct answer
✔particle shape and compactness.
What are the designations for the four types of dental gypsum products? -
correct answer ✔I: Plaster, impression
II: Plaster, cast
III: Dental stone
IV: Dental stone, high strength
,What are the main differences between Type III and Type IV dental gypsum
products? - correct answer ✔Type IV dental stone is characterized by more
compact and smoother particles, resulting in a lower surface area. Therefore,
less water can be used to mix Type IV dental stone, and the dry strengths of
Type IV dental stones are generally greater than those of Type III dental
stones.
What type of dental stone is used to pour edentulous master casts during
complete denture fabrication? - correct answer ✔Type III minimum
expansion dental stone
Why is this type of dental stone used? - correct answer ✔sufficient strength
to resist master cast alteration or damage
but not overly difficult to remove from the dentures after denture base
polymerization.
Why are edentulous master impressions boxed? - correct answer ✔preserve
the border contours of the master impression
control the size and shape of the base of the master cast
produce a dense master cast by vibrating minimum expansion dental stone
into the boxed master impression
to conserve denture stone.
What are the two most common methods of boxing edentulous master
impressions? - correct answer ✔wax boxing method
, plaster and pumice boxing method
What is the recommended method for boxing edentulous master impressions?
- correct answer ✔plaster and pumice boxing method
Why is this method for boxing edentulous master impressions recommended?
- correct answer ✔bc excellent for boxing master impressions made with
elastomeric impression materials
serves equally well for zinc-oxide impression material
How are the best possible physical properties of a particular dental stone
achieved? - correct answer ✔proportion the stone by weight and mix the
dental stone with the amount of water specified by the dental stone
manufacturer
How is a smooth dental stone mix free of air bubbles achieved?e - correct
answer ✔vacuum spatulator under reduced atmospheric pressure
How is a strong dense edentulous master cast achieved? - correct answer
✔Mixing the dental stone in a vacuum spatulator under reduced atmospheric
pressure
What is a master cast? - correct answer ✔replicas of the maxillary and
mandibular residual ridge areas and other parts of the dental arches and facial
structures used to fabricate complete dentures.
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