Dentures Chapter 10 Question and answers already passed 2024/2025
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BOXING AND EXPRESSION
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BOXING AND EXPRESSION
Dentures Chapter 10 Question and answers already passed 2024/2025 Dentures Chapter 10
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 Two different f...
Dentures Chapter 10
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 ✔Two
different forms (alpha and beta) differing in crystallite size, surface area and
lattice perfection
Dental *stone* is the *alpha form* which is composed of: - correct answer
✔Regularly shaped grains with low porosity and requires less water for a
satisfactory mix than the beta form. It is denser and has more superior
physical properties
Dental *plaster* is the *beta form* which is composed of - correct answer
✔irregularly shaped grains and porous character
What is the basis for the classification system used in the American Dental
Association specification for dental gypsum products? - correct answer
✔Based on their *particle shape and compactness.*
What are the designations for the four types of dental gypsum products? -
correct answer ✔Type I: plaster, impression
Type II: plaster, cast
Type III: dental stone
Type IV: dental stone, high strength
What are the main differences between Type III and Type IV dental gypsum
products? - correct answer ✔Type IV has *more compact and smoother
particles*, resulting in a *lower surface area*. Therefore, less water can be
, used to mix Type IV, and the dry strengths of Type IV 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? Why is this type of dental stone used? - correct
answer ✔*Type III dental stone* is used to pour edentulous master casts
because it provides sufficient strength to resist master cast alteration or
damage during clinical and laboratory procedures while fabricating dentures
without making it too difficult to remove the dentures after denture base
polymerization.
Why are edentulous master impressions boxed? - correct answer ✔(1) To
preserve the border contours of the master impression
(2) Control the size and shape of the base of the master cast
(3) Produce a dense master cast by vibrating minimum expansion dental
stone into the boxed master impression
(4) To conserve denture stone.
What are the two most common methods of boxing edentulous master
impressions? - correct answer ✔(1)The wax boxing method and (2) the
plaster and pumice boxing method
What is the *recommended method for boxing edentulous master
impressions*? Why is this method for boxing edentulous master impressions
recommended? - correct answer ✔The *plaster and pumice boxing method*-
because it is excellent for impressions made with *elastomeric impression
materials* and equally well for *zinc-oxide impression material.*
How are the best possible physical properties of a particular dental stone
achieved? - correct answer ✔It is necessary to *proportion the stone by
weight*, and mix the stone with the amount of water specified by the
manufacturer. (*mix correct ratio of water & powder*)
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