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Duplicate of Dental Materials- Exam#1, Chapters1-3 Flashcards | StudBud
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Duplicate of Dental Materials- Exam#1, Chapters1-3
Fatigue failure?
Which of the following is an example of direct resto material
Duplicate of Dental Materials- Exam#1, Chapters1-3
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1
Which of the following is an example of direct resto material
amalgam resto
cast gold crown
ceramic implant abutment
porcelain inlay
2
Fatigue failure?
is not a factor for resto dental materials
occurs as the result of a large, single-force application
occurs as the result of microscopic flaws that grow overtime
is not dependent upon conditions in the oral cavity
3
The best resource for choosing which dental material to use could be determined by
meeting manufacturers represntatives
discussing which materials colleagues use
reading professional journals
all of the above are good
4
Which statement is true for the property of wetting as related to dental materials
teflon surface of cooking equipment has good wetting
liquids generally spread better over low surface energy
has high surface energy when liquids bead up on surface
thin-film of dental cement is desirable to cement crowns
5
In history, the earliest recorded mention of restorative dentistry occurs about
1200 AD
2500 BC
600 BC
1700 AD
6
Which of the following is the hardest material
cast gold resto
enamel of a tooth
composite material
cementum of a tooth
7
Contact bw two dissimilar metals in the mouth may result in
galvanic shock
electrical current
metallic taste
all of the above
8
The "amalgam war" was fought over
value and safety of silver dental amalgam
price of silver in relation to tin and zinc
mining rights in states in the western region of US
patent issues bw france and england
9
Of the following, which is not an application of a material's classification?
its fabrication
its utilzation
all of these are correct
its longevity
10
The normal resting pH of saliva ranges from 6.2 to _, which is neutral
7
6.6
14
1
11
in general,__ temp and __ humidity will accelerate the reaction of the material
high, high
low, low
low, high
high, low
12
Dental materials considered devices, are subject to control and regulation of the_ Center for..
department of human and health services
food and drug admin
centers for disease control and prevention
drug enforcement admin
13
Which of the following are considered to be therapeutic dental materials
partial or complete denture
fluorides and pit and fissures sealants
filling, inlay, crown, bridge or implant
medicated bases or topical treatments for perio disease
14
Silver paste was first mentioned as a restorative material for teeth by the
greeks
chinese
french
romans
15
Percolation
helps seal the interface bw tooth and resto
= in recurrent caries, staining, pulpal irritation
rate at which heat flows through a material
form of chemical rather than mechanical retention
16
Which of the following has been suggested to delay formation of surface tarnish on amalgam
non-copper amalgam
incremental addition
polishing
undercondensation
17
Which of the following is the best thermal conductor?
ceramic
enamel
dentin
gold
18
occurs when two atoms share electrons in their outer shell, creating full shells for both
covalent bond
hydrogen bond
ionic bond
metallic bond
19
Fatigue failure occurs when:
excessive expansion and contraction result in voids
microleakage produces recurrent caries and resto failure
percolation of the resto= tooth sensitivity
microscopic flaws occur, resulting in fracture of resto
20
Altering the set ratios of a material for any purpose will
produce adverse results
have little significance
make the material harder
speed up the initial set
21
Which of the following would not be considered a direct placement resto material
gold foil
composite
amalgam
gold
22
Which of the following is not a concern regarding identification of dental materials in mouth
therapeutic agents could erode some materials
both are concerns when materials are identified
scaling could damage the surfaces of some materials
23
Which of the follow resto technique was first introduced in 1955?
cast gold inlays
synthetic resins for denture bases
cohesive gold foil
acid-etching technique
24
Dual set materials utilize __ setting reactions
both light-activated and chemical
light-activated but not chemcial
neither light-activated nor chemcial
chemical setting but not light-activated
25
The delivery of dental materials most often falls to
DH
lab tech
dentist
DA
26
Dr. Frederick McKay is credited with
noting dental fluorosis in Colorado Springs
developing an acceptable formula for silver dental amalgam
demonstrating a casting method to produce gold inlays
the introduction of dental cements
27
Which of the following dental resto materials is particular susceptible to corrosion
acrylic
porcelain
comp resin
amalgam
28
Liquids are evaluated by their
wettability
flowability
viscosity
resistance
29
Microleakage is caused by
all of the above could cause microleakage
expansion and contraction of a resto
fracture within a resto
poorly placed resto
30
Which of the following is true concerning initial and final setting times?
once a material has reached the initial set, not fracture
final set always occurs while the patient is still in dental
the material must not be disturbed through the end
moisture & pressure controls are freq. important initial set
31
Most modern dental materials are made to be moisture resistant
true
false
32
Excessive expansion of a resto material may result in
fracture of cusps
corrosion
galvanism
leakage of fluid and bacteria into the gaps
33
Adhesion is the method of __ retention
chemical
mechanical
dual
34
Stress is the amount of force exerted from within object and_is the amount of change that force
strain
compression
chemical bonding
tension
35
Which of the following statement is true concerning the ADA seal?
ada seal is usually awarded for the life of the product
process typically requires at least 3 months for completion
all dental products qualify
products do not require evaluation when the comp is changed
36
Which of the following is considered to be the most reliable means of clinical assessment
patient history
use of the air-water syringe
evaluation of radiographs
tactile evaluation of the tooth surface
37
The colour range of a tooth is usually seen by the human eye as yellow or brown.
chroma
value
hue
38
The coefficient of thermal expansion is significant in dental materials because its
measures the change in oral temp related to food
measures the change in volume and length of resto
measures the amount of stress and strain on resto
measures the amount of percolation of resto interface
39
Which of the following materials has the highest ultimate compressive strength?
porcelain
acrylic
amalgam
composite resins
40
__ is the time permitted to manipulate the material in the mouth
mixing time
initial set time
final set time
working time
41
The thicker or thinner a material is, is called its
flowability
thixotropic
viscosity
density
42
Which of the following would not be an adverse effect of a material
hyposensitivity
postoperative sensitivity
toxicity
hypersensitivty
43
The first acceptance amalgam formula was developed by __in 1895
g.v. black
dr. william taggart
dr. frederick mckay
pierre fuchard
44
Which of the following is an example of a secondary rather than primary bond
metallic bond
van der waals bond
covalent bond
ionic bond
45
Which of the following resto materials has a coefficient of thermal expansion&conductivity
comp
amalgam
porcelain
gold
46
The thermal conductivity of composite resin
does not conduct temperature
is lower than tooth structure
is similar to metal restorations
is similar to tooth structure
47
Represents the standards used to develop specifications& testing on international level
interpol
ADA
ISO
FDA
48
Of the three types of forces, which is most concerned with the stretching of a material
shearing force
tensile force
compressive force
49
__forces is applied when two surfaces slide against each other or in a twisting or rotating
shearing
axial
compressive
tensile
50
Some materials give off heat when mixed, this is called a/an
thermal conductivity
exothermic reaction
chemical reaction
coefficient of thermal expansion
51
Which of the following forms of matter has/have both shape and volume
gas
liquid
solid
52
Which of the following is true of galvanism
galvanic stimulation will decrease with time as oxides form
observed in patients with comp but not amalgam
is it an electrical current transmitted bw 2 similar metals
salts of saliva inhibit the movement of electrical current
53
The use of expired or improperly stored materials may:
render the material ineffective
be a little consequence
cause a toxic reaction
54
Metals that can withstand dimensional change without breaking are
malleable
ductile
tough
resilient
55
Which of the following is not a classification of dental materials
preventive
therapeutic
restorative
biological
56
Normal masticatory forces on the occlusal surfaces of molar teeth can increase to as much as__
28,000
1000
280
10,000
57
If molecules of a solid are arranged in a random form with no regular pattern, solid is called
thixotropic
amorphous
ductile
malleable
58
The max amount of stress a material can take before breaking is known as its
max elasticity
ultimate strength
ultimate capacity
material hardness
59
A __ material will flow more easily under mechanical pressure
therapeutic
viscous
resistance
thixotropic
60
__ refers to the intensity or strength of the colour
opacity
chroma
hue
value
61
Since 2005, the ADA Seal of Acceptance is awarded to
consumer but not professional products
professional but not consumer products
neither professional nor consumer products
both professional and consumer products
62
The reaction initiated when a catalyst and a base are mixed together will be
chemical
all are possible
physical
dual
63
Which of the following is NOT a good conductor temp
amalgam resto
composite resto
gold crown
64
todays approach to dental care is referred to as
science-based dentistry
evidence based dentistry
individualized care
comprehensive care
65
Which of the following is not primary bond
ionic
metallic
covalent
hydrogen
66
Until 1970's, which of the following groups of dental auxiliaries were allowed to perform intra
certified DA
RDA
DA
DH
67
The staining of resins and acrylics from repeated exposure to coffee, tea and dyed beverages
galvanism
tarnish
compressive forces
water sorption
68
When an object cannot resist force, __ occurs
distortion
both are correct
deformation
69
The stability of a solid is evaluated by nothing
its atomic mass and number
whether the molecules are arranged uniformly
how hard the material is when set
whether or not it is a compound