Ch 16 Questions with complete solution 2024/2025 Ch 16 - Gypsum and Wax Products
carefully controlled calcination under steam pressure in a closed container produces?
a. plaster
b. dental stone
c. high strength stone
d. high strength, high expansion stone - correct answer dental stone
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Ch 16 - Gypsum and Wax Products
carefully controlled calcination under steam pressure in a closed container
produces?
a. plaster
b. dental stone
c. high strength stone
d. high strength, high expansion stone - correct answer ✔dental stone
to increase the working time of a gypsum product, without changing any
physical properties, it is best to
a. decrease the water to powder ratio
b. increase the rate of spatulation
c. increase the water temp
d. decrease the water temp - correct answer ✔decrease the water temp
the main difference between model plaster and dental stone is
a. chemical formula
b. solubility in water
c. particle size and shape
d. accelerators and retardants - correct answer ✔particle size and shape
the most appropriate type of gypsum product to use for orthodontic casts is
a. type I
b. type II
c. type III
d. type IV - correct answer ✔type III
, initial setting can be detected clinically by
a. loss of gloss
b. the end of the exothermic reaction
c. a change in color
d. testing to see whether the material is hard enough to separate from the
impression - correct answer ✔loss of gloss
The area of the diagnostic cast that records the hard and soft tissues is called
the
a. art portion
b. base
c. anatomical portion
d. impression - correct answer ✔anatomical portion
a study model is a positive reproduction. an impression is a negative
reproduction
a. both statements are true
b. both statements are false
c. the first statement is true and the second statement is false
d. the first statement is false and the second statement is true - correct
answer ✔both statements are true
Material that will act as retarders for the set of gypsum products include
a. saliva
b. set gypsum products
c. slurry water from the model trimmer
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