Dental Materials Final Exam Verified
Study Questions And Answers
The proper method of clinically prolonging the setting time of alginate hydrocolloids is
to: CORRECT ANSWERS Decrease water temperature
The gel reaction of a reversible hydrocolloid can be described as: CORRECT
ANSWERS chemical
After alginate impressions are taken, they should be poured within: CORRECT
ANSWERS 5 minutes
To minimize gagging and overcome fear when making an alginate impression for a
child, it is recommended to: CORRECT ANSWERS Secure the mandibular impression
first
An impression should be removed from the mouth with a quick, continuous displacing
movement to minimize: CORRECT ANSWERS Permanent deformation
Which of the following gypsum products requires the lowest water-powder ratio for
standard mixes? CORRECT ANSWERS Improved stone
If the alginate impression material becomes separated from the tray during removal, it
should be: CORRECT ANSWERS discarded and another impression taken
Model plaster or stone is sifted into water before mixing in order to: CORRECT
ANSWERS Allow the particles to become wet from the bottom to the top to drive off
entrapped air from the powder
In pouring an impression, stone should be added at only one corner of an impression to
prevent the: CORRECT ANSWERS Entrapment of air or water on the surface of the
cast
Hypersensitivity to cold that develops after placement of an amalgam restoration usually
indicates that: CORRECT ANSWERS pulp hyperemia is present
Pit and fissure sealants are similar to fluorides applied topically in that both types of
agents: CORRECT ANSWERS must be reapplied periodically to maintain effectiveness
A green stone may be used in finishing an amalgam restoration in order to: CORRECT
ANSWERS Eliminate high spots and gross flash at the margins
Which of the following should be used in polishing a composite resin restoration?
A. rubber dam
, B. Cotton rolls
C. high suction
D. none of the above CORRECT ANSWERS D. none of the above
The primary reason to change periodontal dressings six to eight days after surgery is to:
CORRECT ANSWERS Debride the surgical site
The addition of zinc acetate crystals to a mix of ZOE cement functions to: CORRECT
ANSWERS Shorten setting time
Which of the following materials require a calcium hydroxide liner for pulp protection?
CORRECT ANSWERS Zinc phosphate cement, zinc silicophosphate cement,
composite resin restoration
Which of the following components in a mix of ZOE is responsible for increasing the
crushing strength of the mix? CORRECT ANSWERS Resin
Excessive expansion of an amalgam restoration may be caused by: CORRECT
ANSWERS moisture contamination
Placing a periodontal dressing that contains water-soluble metallic oxides and
carboxylic acids (Coe Pack) is best facilitated by: CORRECT ANSWERS Coating
fingers with petroleum jelly
In removing a temporary zinc phosphate cement restoration from a molar prepared for
an amalgam restoration, the material in the deepest portion of the preparation is left in
place to: CORRECT ANSWERS Provide thermal insulation of the pulp
A glass slab should be cooled when mixing zinc phosphate cement to: CORRECT
ANSWERS increase the powder-liquid ratio
Which of the following impression materials are used for inlays? CORRECT ANSWERS
Polysulfide and Reversible hydrocolloid
Which of the following is the material of choice for deep-seated cavity preparations in
which there may be a microscopic exposure? CORRECT ANSWERS Calcium
hydroxide
Which of the following materials may be used as a sedative dressing under a temporary
restoration? CORRECT ANSWERS Zinc-oxide eugenol
Which of the following is necessary to achieve maximum accuracy with a polysulfide
rubber impression? CORRECT ANSWERS The impression material must adhere to the
tray
Study Questions And Answers
The proper method of clinically prolonging the setting time of alginate hydrocolloids is
to: CORRECT ANSWERS Decrease water temperature
The gel reaction of a reversible hydrocolloid can be described as: CORRECT
ANSWERS chemical
After alginate impressions are taken, they should be poured within: CORRECT
ANSWERS 5 minutes
To minimize gagging and overcome fear when making an alginate impression for a
child, it is recommended to: CORRECT ANSWERS Secure the mandibular impression
first
An impression should be removed from the mouth with a quick, continuous displacing
movement to minimize: CORRECT ANSWERS Permanent deformation
Which of the following gypsum products requires the lowest water-powder ratio for
standard mixes? CORRECT ANSWERS Improved stone
If the alginate impression material becomes separated from the tray during removal, it
should be: CORRECT ANSWERS discarded and another impression taken
Model plaster or stone is sifted into water before mixing in order to: CORRECT
ANSWERS Allow the particles to become wet from the bottom to the top to drive off
entrapped air from the powder
In pouring an impression, stone should be added at only one corner of an impression to
prevent the: CORRECT ANSWERS Entrapment of air or water on the surface of the
cast
Hypersensitivity to cold that develops after placement of an amalgam restoration usually
indicates that: CORRECT ANSWERS pulp hyperemia is present
Pit and fissure sealants are similar to fluorides applied topically in that both types of
agents: CORRECT ANSWERS must be reapplied periodically to maintain effectiveness
A green stone may be used in finishing an amalgam restoration in order to: CORRECT
ANSWERS Eliminate high spots and gross flash at the margins
Which of the following should be used in polishing a composite resin restoration?
A. rubber dam
, B. Cotton rolls
C. high suction
D. none of the above CORRECT ANSWERS D. none of the above
The primary reason to change periodontal dressings six to eight days after surgery is to:
CORRECT ANSWERS Debride the surgical site
The addition of zinc acetate crystals to a mix of ZOE cement functions to: CORRECT
ANSWERS Shorten setting time
Which of the following materials require a calcium hydroxide liner for pulp protection?
CORRECT ANSWERS Zinc phosphate cement, zinc silicophosphate cement,
composite resin restoration
Which of the following components in a mix of ZOE is responsible for increasing the
crushing strength of the mix? CORRECT ANSWERS Resin
Excessive expansion of an amalgam restoration may be caused by: CORRECT
ANSWERS moisture contamination
Placing a periodontal dressing that contains water-soluble metallic oxides and
carboxylic acids (Coe Pack) is best facilitated by: CORRECT ANSWERS Coating
fingers with petroleum jelly
In removing a temporary zinc phosphate cement restoration from a molar prepared for
an amalgam restoration, the material in the deepest portion of the preparation is left in
place to: CORRECT ANSWERS Provide thermal insulation of the pulp
A glass slab should be cooled when mixing zinc phosphate cement to: CORRECT
ANSWERS increase the powder-liquid ratio
Which of the following impression materials are used for inlays? CORRECT ANSWERS
Polysulfide and Reversible hydrocolloid
Which of the following is the material of choice for deep-seated cavity preparations in
which there may be a microscopic exposure? CORRECT ANSWERS Calcium
hydroxide
Which of the following materials may be used as a sedative dressing under a temporary
restoration? CORRECT ANSWERS Zinc-oxide eugenol
Which of the following is necessary to achieve maximum accuracy with a polysulfide
rubber impression? CORRECT ANSWERS The impression material must adhere to the
tray
