Chapter 16 questions and answers rated A+ 2024/2025
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Course
DENTAL MATERIALS
Institution
DENTAL MATERIALS
Chapter 16 questions and answers rated A+ 2024/2025 Chapter 16 questions
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 b. dental stone
To dec...
Chapter 16 questions
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 ✔b. dental stone
To decrease 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 temperature
d. decrease the water temperature - correct answer ✔c. increase the water
temperature
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 retarders - correct answer ✔c. 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 ✔c. type III
Initial setting can be detected clinically by:
a. loss of gloss
b. the end of exothermic reaction
c. a change in color
d. testing to see whether the material is hard enough to separate from the
impression - correct answer ✔a. 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. anatomic portion
d. impression - correct answer ✔c. anatomic portion
A study model is a positive reproduction. An impression is a negative
reproduction
true/true
false/false
true/false
false/true - correct answer ✔true/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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