Dental Materials Final Exam Complete
Questions And Answers | Verified
In the United States, standards for dental materials are developed and administered by
the: CORRECT ANSWERS ADA (American Dental Association)
All of the following are reasons for a dental hygienist to have knowledge and
understanding of dental materials EXCEPT: CORRECT ANSWERS Deciding which
material is best for the patient's restoration
An amalgam restoration located on the gingival third of tooth #3 would be a Class ____
restoration. CORRECT ANSWERS V
The biologic nature of the oral environment and the size of the oral cavity restrict the
use of dental materials. One restriction is the degradation of restorations. CORRECT
ANSWERS Both statements are true
When the temperature changes in the mouth, the teeth and most restorative materials
expand and contract by the same amount. No leakage occurs around the restoration.
CORRECT ANSWERS Both statements are false
Which of the following oral tissues provides feedback to the individual regarding the
forces placed on the tooth? CORRECT ANSWERS Periodontium
Which of the following restorations is utilized when a substantial amount of a tooth is
missing? CORRECT ANSWERS Crown
The design of a cavity preparation aids in the retention of a restoration. The walls of an
amalgam preparation diverge while the walls of an inlay converge. CORRECT
ANSWERS The first statement is true; the second statement is false.
If a restoration is fabricated on a replica (positive reproduction) of a patient's teeth, it is
referred to as a: CORRECT ANSWERS Cast
An example if an indirect restorative material would be: CORRECT ANSWERS Ceramic
(porcelain)
Medical devices are grouped into three categories according to Medical Device
Amendment of 1976. Which class of devices is most regulated? CORRECT ANSWERS
III
The molecules found in a pane of glass can be best described as: CORRECT
ANSWERS Amorphous solid, having short-range order
,A partial charge resulting from an uneven distribution of electrons around an atom forms
a bond known as: CORRECT ANSWERS Secondary
What type of bond is formed when the electrons are shared by all the atoms that make
up that object and may be thought of as "positive cores" in a "cloud of negative mobile
valence electrons"? CORRECT ANSWERS Metallic
A notable advantage of using ceramic materials in dentistry is the property of:
CORRECT ANSWERS Translucency
A dental polymer with many cross-links as compared to one with no cross-links would
be a dental material that is: CORRECT ANSWERS Stiff and strong
. All of the following are examples of a composite except: CORRECT ANSWERS Tin foil
When the shared electrons of a covalent bond are not shared equally, and one of the
bonded atoms is partially positive and the other is partially negative, a _________ is
formed. CORRECT ANSWERS Permanent Dipole
The sliding of atoms past each other allows this material to bend, not fracture, and
maintain its strength. This material is an example of a: CORRECT ANSWERS Metal
A mixture of two liquids that do not blend together to form one liquid is termed a (an):
CORRECT ANSWERS Emulsion
When two atoms share a pair of electrons, the resulting atomic bond is termed a (an):
CORRECT ANSWERS Covalent
A drop of water on a Popsicle is an example of: CORRECT ANSWERS Good wetting
(low contact angle)
The tightening of a guitar string is an example of which of the following stresses?
CORRECT ANSWERS Tension
The modulus of elasticity is an indication of what property of material? CORRECT
ANSWERS Strength
Cooled materials will contract, and heated materials will expand. A measurement of this
change in volume in relation to change in temperature is called the coefficient of thermal
expansion. CORRECT ANSWERS Both statements are true.
When a stress is induced in a material that is greater than the material's yield strength,
the stress is _____ proportional to the strain, and the material does not return to its
original shape. CORRECT ANSWERS No longer
Which formula defines the modulus of elasticity? CORRECT ANSWERS Stress/ strain
, An example of a physical property is: CORRECT ANSWERS Density
A twisting force is termed: CORRECT ANSWERS Torsion
The ability of a material to dissolve in liquid is termed: CORRECT ANSWERS Solubility
Elasticity is an example of which of the following properties? CORRECT ANSWERS
Mechanical
The rate of heat flow through a material is referred to as: CORRECT ANSWERS
Thermal conductivity
Jennifer is a practicing hygienist who goes to a nearby restaurant each day for lunch.
She often orders a cola with ice and a bowl of homemade soup. As she eats and drinks,
her composite restorations (tooth-colored) and tooth structure are expanding and
contracting at different rates. This change in volume or length of these materials due to
the hot food and old drink is referred to as: CORRECT ANSWERS Coefficient of
thermal expansion
Fingernail polish remover has "solvent" properties, as it will remove the polish from our
fingernails. Another property polish remover has its tendency to evaporate. Fingernail
polish remover can be said to have: CORRECT ANSWERS High vapor pressure
________ is the force used to condense an amalgam in a preparation CORRECT
ANSWERS Compression
. A hardened cement having "low" _____ can firmly hold a patient's gold crown in place
for years in a wet environment. CORRECT ANSWERS Solubility
_______ is the term given to the increase of stress around defects within an object.
CORRECT ANSWERS Compression
Postage stamps are now self-adhesive. The paper (actual stamp) is referred to as the
______, and the sticky material on the back of the stamps is termed the ______.
CORRECT ANSWERS Adherend, adhesive
Kristin has orthodontic appliances, commonly known as "braces." These include metal
brackets directly bonded to the facial surface with a bonding material. One bracket
breaks off, and the "failure" occurs within the bonding material. This type of failure is
considered to be: CORRECT ANSWERS Cohesive
Orthophosphoric acid (enamel etchant) is commonly used in a _______ concentration.
CORRECT ANSWERS 37%
Questions And Answers | Verified
In the United States, standards for dental materials are developed and administered by
the: CORRECT ANSWERS ADA (American Dental Association)
All of the following are reasons for a dental hygienist to have knowledge and
understanding of dental materials EXCEPT: CORRECT ANSWERS Deciding which
material is best for the patient's restoration
An amalgam restoration located on the gingival third of tooth #3 would be a Class ____
restoration. CORRECT ANSWERS V
The biologic nature of the oral environment and the size of the oral cavity restrict the
use of dental materials. One restriction is the degradation of restorations. CORRECT
ANSWERS Both statements are true
When the temperature changes in the mouth, the teeth and most restorative materials
expand and contract by the same amount. No leakage occurs around the restoration.
CORRECT ANSWERS Both statements are false
Which of the following oral tissues provides feedback to the individual regarding the
forces placed on the tooth? CORRECT ANSWERS Periodontium
Which of the following restorations is utilized when a substantial amount of a tooth is
missing? CORRECT ANSWERS Crown
The design of a cavity preparation aids in the retention of a restoration. The walls of an
amalgam preparation diverge while the walls of an inlay converge. CORRECT
ANSWERS The first statement is true; the second statement is false.
If a restoration is fabricated on a replica (positive reproduction) of a patient's teeth, it is
referred to as a: CORRECT ANSWERS Cast
An example if an indirect restorative material would be: CORRECT ANSWERS Ceramic
(porcelain)
Medical devices are grouped into three categories according to Medical Device
Amendment of 1976. Which class of devices is most regulated? CORRECT ANSWERS
III
The molecules found in a pane of glass can be best described as: CORRECT
ANSWERS Amorphous solid, having short-range order
,A partial charge resulting from an uneven distribution of electrons around an atom forms
a bond known as: CORRECT ANSWERS Secondary
What type of bond is formed when the electrons are shared by all the atoms that make
up that object and may be thought of as "positive cores" in a "cloud of negative mobile
valence electrons"? CORRECT ANSWERS Metallic
A notable advantage of using ceramic materials in dentistry is the property of:
CORRECT ANSWERS Translucency
A dental polymer with many cross-links as compared to one with no cross-links would
be a dental material that is: CORRECT ANSWERS Stiff and strong
. All of the following are examples of a composite except: CORRECT ANSWERS Tin foil
When the shared electrons of a covalent bond are not shared equally, and one of the
bonded atoms is partially positive and the other is partially negative, a _________ is
formed. CORRECT ANSWERS Permanent Dipole
The sliding of atoms past each other allows this material to bend, not fracture, and
maintain its strength. This material is an example of a: CORRECT ANSWERS Metal
A mixture of two liquids that do not blend together to form one liquid is termed a (an):
CORRECT ANSWERS Emulsion
When two atoms share a pair of electrons, the resulting atomic bond is termed a (an):
CORRECT ANSWERS Covalent
A drop of water on a Popsicle is an example of: CORRECT ANSWERS Good wetting
(low contact angle)
The tightening of a guitar string is an example of which of the following stresses?
CORRECT ANSWERS Tension
The modulus of elasticity is an indication of what property of material? CORRECT
ANSWERS Strength
Cooled materials will contract, and heated materials will expand. A measurement of this
change in volume in relation to change in temperature is called the coefficient of thermal
expansion. CORRECT ANSWERS Both statements are true.
When a stress is induced in a material that is greater than the material's yield strength,
the stress is _____ proportional to the strain, and the material does not return to its
original shape. CORRECT ANSWERS No longer
Which formula defines the modulus of elasticity? CORRECT ANSWERS Stress/ strain
, An example of a physical property is: CORRECT ANSWERS Density
A twisting force is termed: CORRECT ANSWERS Torsion
The ability of a material to dissolve in liquid is termed: CORRECT ANSWERS Solubility
Elasticity is an example of which of the following properties? CORRECT ANSWERS
Mechanical
The rate of heat flow through a material is referred to as: CORRECT ANSWERS
Thermal conductivity
Jennifer is a practicing hygienist who goes to a nearby restaurant each day for lunch.
She often orders a cola with ice and a bowl of homemade soup. As she eats and drinks,
her composite restorations (tooth-colored) and tooth structure are expanding and
contracting at different rates. This change in volume or length of these materials due to
the hot food and old drink is referred to as: CORRECT ANSWERS Coefficient of
thermal expansion
Fingernail polish remover has "solvent" properties, as it will remove the polish from our
fingernails. Another property polish remover has its tendency to evaporate. Fingernail
polish remover can be said to have: CORRECT ANSWERS High vapor pressure
________ is the force used to condense an amalgam in a preparation CORRECT
ANSWERS Compression
. A hardened cement having "low" _____ can firmly hold a patient's gold crown in place
for years in a wet environment. CORRECT ANSWERS Solubility
_______ is the term given to the increase of stress around defects within an object.
CORRECT ANSWERS Compression
Postage stamps are now self-adhesive. The paper (actual stamp) is referred to as the
______, and the sticky material on the back of the stamps is termed the ______.
CORRECT ANSWERS Adherend, adhesive
Kristin has orthodontic appliances, commonly known as "braces." These include metal
brackets directly bonded to the facial surface with a bonding material. One bracket
breaks off, and the "failure" occurs within the bonding material. This type of failure is
considered to be: CORRECT ANSWERS Cohesive
Orthophosphoric acid (enamel etchant) is commonly used in a _______ concentration.
CORRECT ANSWERS 37%
