Dental Materials

a defining characteristic of a solid is that it has
a.shape and volume
b shape only
c. neither shape nor volume
d. volume but no shape

the most stable primary bonds
A. have random form
B. are amorphous
C. have regular crystalline structures
D. have mixed physical structure

the correct term for describing when an applied stress is proportional to a resulting strain is
A. ductility
B. elasticity
C. ultimate strength
D. toughness

when the weight of a material increases in relationship to its volume this is described as
A. resilient
B. hard
C. dense
D. elastic

hardness determines the materials ability to
A. deform an object
B. be easily compressed
C. penetrate an object
D. break an object

when deformation is not permanent and a material recovers it has good?
A. elasticity
B. malleability
C. toughness
D. ductility

resistance to flow is known as
A. viscosity
B. density
C. curing
D. film thickness

thixotropic materials are those that
A. flow at lower temps
B. flow at higher temps
C. have poor viscosity
D. flow under mechanical forces

indirect restorative materials would include all of the following except
A. gold crowns
B. porcelain crowns
C. amalgam restorations
D. porcelain veneers

mixing time is the length of time from
A. the beginning of mixing to the end of working time
B. beginning of mixing to the beginning of working time
C. the beginning of the mixing to the end of setting time
D. beginning of mixing to the initial set time

a material mixed slowly on a cooled glass surface will
A. have a longer working and shorter setting time
B. have shorter working and setting time
C. have a shorter working and longer setting time
D. have a longer setting and working time