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DENTAL MATERIALS EXAM 1 Flashcards | StudBud
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DENTAL MATERIALS EXAM 1
DENTAL MATERIALS EXAM 1
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1
Hardness, stress, strain, strength, and thermal conductivity are all
mechanical properties.
False
True
2
On a hazardous material label, what does the red label mean?
Flammability Hazard
Instability Hazard
Environment Hazard
Health Hazard
3
How are we
educating
patients?
Solely focusing on the aesthetic aspects of materials.
Having an accurate knowledge of the behavior of a dental material.
To present options concerning dental material choices and the maintenance.
Reducing the need for patient consultations.
4
What property describes a subset of physical properties and describes a material's ability to resist forces?
Physical Properties
Mechanical Properties
Biological Properties
Chemical Properties
5
Force, stress, and strain, torsion, resilience, and ductility impact the biomechanics of a material
False
True
6
Microorganisms can enter the body via exposure to blood, body fluid, or oral and respiratory secretions.
False
True
7
Microleakage is the seepage of harmful materials between the walls of the tooth and the restoration
True
False
8
Surface discoloration of a metal restoration is called
Corrosion
Tarnish
Crystallization
Metallurgy
9
The FDA ensures that products meet certain standards of safety and efficacy.
False
True
10
There are mult hazards associated w/ the use of dental lathe in lab, which is
NOT
a hazard associated w/ dental lathe
Mercury Vapor
Flying debris
Spatter
Aerosols
11
Color shades can vary depending on the incident light or source of light. This effect could be called
Meniscus
Spectrum
Metamerism
Chroma
12
Melting, boiling points, density, viscosity, thermal conductivity, ect. are all
physical properties
False
True
13
Final set time
is
the time needed for the reaction that begins when the material is mixed to go to completion.
False
True
14
Material subject to repeated stresses such as in mastication may be subject to fracture due to
Fatigue limit
Forces stretching an object
Flexture stress
Force exerted over a large area
15
Materials that set through a timed chemical reaction with the combination of a catalyst and base
Physical set materials
Light activated materials
Dual-set materials
Chemical set materials
16
The safe interaction of a dental material with the rest of the body is defined as the material's
Therapeutic reaction
Biocompatibility
Carcinogenicity
Radioactivity
17
What variables can
affect the manipulation
of dental materials?
Effect of temperature & humidity- high temps/humid up, low temps/humid slow
Ratios of components (ex. water to powder ratio, how viscous is it?)
Mixing of components- how quick or slow it is mixed
ALL are correct
18
What responses can be had if a material is
NOT
acceptable on soft tissues?
Enhanced aesthetic appearance
Postoperative sensitivity, toxicity, and hypersensitivity
Increased durability and malleability
Improved thermal conductivity
19
Excessive film thickness of cements may cause
Fracture of the restoration
An increase in retention
Improper seating of the restoration
A decrease in marginal leakage
20
How are we
enhancing safety
with the studies of dental materials?
Handling and disposing of materials appropriately.
Awareness of the overall success of a particular material's properties.
Recognizing dental materials that are present in the oral cavity
Having an accurate knowledge of the behavior of a dental materials
21
Colonies of bacteria growing on the teeth are called
Parasites
Primary Intruders
Principle invaders
Dental Plaque
22
Restorative materials with the values of thermal conductivity similar to enamel include
Amalgam
Gold
Composite teeth
Silver
23
A material mixed slowly on a coolest glass surface will
Have a longer working and setting time
Have a shorter working and setting time
Have a shorter working and longer setting time
Have a longer working and shorter setting time
24
What are some challenges in the oral cavity with dental materials?
Moisture/acid levels and temperature.
All the above are correct.
Adverse responses in patients and biomechanics of the material
Galvanism, retention, and microleakage
25
How are we
maintaining materials
properly?
To ensure that products meet certain standards of safety and efficacy
To maintain materials used to fabricate and maintain restorations
Handling and disposing of materials appropriately.
Recognizing dental materials that are present in the oral cavity; cleaning
26
What are the characteristics of a
permanent restoration
in dentistry?
Restorations expected to be a long-lasting replacement.
They require frequent replacements.
They are used for cosmetic purposes only.
They are a temporary solution for dental issues.
27
What does the ADA do?
It limits the variety and amount of dental products available.
It ensures ALL dental products are free of cost to patients.
It mandates that all dental products must be made in the USA.
Regulates dental products on the market so that consumers can be informed.
28
On a hazardous material label, what does the yellow label mean?
Deadly Hazard
Health Hazard
Flammability Hazard
Instability Hazard
29
What is the most important step the dental auxiliary can take to prevent the transmission of diseases?
Practice appropriate hand hygiene
Wear gloves
Utilize nitrile utility gloves
Wear a dust and mist respirator face mask
30
What is acute toxicity?
Low levels of exposure over a long period of time
Low levels of exposure over a short period pf time
High levels of exposure over a long period of time
High levels of exposure over a short period of time
31
What does the blue label on a hazardous material label indicate?
Health hazard
Flammability hazard
Environment hazard
Reactivity hazard
32
What is chronic chemical toxicity ?
Repeated exposures, low levels of exposure over a short period of time
Repeated exposures, low levels of exposure over a long period of time
Repeated exposures, high levels of exposure over short period of time
Repeated exposures, high levels of exposure over a long period of time
33
Why do we study dental materials ?
Enhance safety, promote awareness, maintain materials, delivery, & educate
You can teach your patients and provide them with options
You can increase your efficiency and success rate
To learn how to use instruments
34
Which of the following are job related health and safety hazards in the dental office ?
Exposure to biological contaminants
Exposure to airborne contaminants and toxic effects of chemicals
Exposure to particulate matter and exposure to mercury.
All of the above
35
The classifications of dental materials are... metals, ceramics, polymers, and composites
True
False
36
What are the roles in the use of dental materials ?
application of therapeutic and preventative agents
All the above
auxillary care
restorative material care
37
When the maxillary and mandibular incisors are used for cutting, shearing force is applied.
False
True
38
Ways in which chemicals can enter the body include:
Inhaling, cuts on the skin and by touching the product of a reaction
Swallowing, cuts on skin, by touching the product of a reaction
swallowing, inhaling, and by touching the product of a reaction
Swallowing, inhaling, and through cuts on skin
39
What is
mixing time
in the context of dental materials?
The period of which a material can be stored before use.
They time required for a material to set
The time taken for a chemical reaction to occur.
The duration needed to achieve a uniform mixture of components.
40
Which of the following
best defines biocompatibility
in dental materials?
The ability of a material to withstand very high temperatures.
The capacity of a material to conduct electricity.
Property of a material that allows it not to impede or affect living tissue
The resistance of a material to corrosion in the oral environment.
41
Hardness determines the material's ability to
Deform an object
Resist scratching and penetrate an object
Break an object
Be easily compressed
42
What is the definition of
hue
in the context of dental materials and the tooth color?
The dominant color of the wavelength detected.
The intensity of color. Tooth colors are in a white-brown range.
Tooth colors are predominantly seen in the yellow-brown range
Both A and B
43
Why are posterior teeth particularly suited to withstand compressive forces during chewing?
They deal with this because of their broad occlusal surface & multi roots.
They deal with this because they are used less frequently for chewing.
They deal with this because they have a single root structure.
They deal with this because they are made of softer materials.
44
Which of the following restorative materials is the most soluble ?
Acrylic
Porcelain
Amalgam
Glass ionomer
45
Explain how
microleakage
leads to recurrent decay and post-op sensitivity ?
Both B and D
Microleakage creates barriers against bacteria & it enhances the durability
Fluids, bacteria,& other foreign chem will seep into the tubules of dentin
Bacteria can seep into the crevice& can cause decay if it cannot be brushed
46
What does the term '
value
' refer to in the context of dental materials and to the tooth color?
The strength of a material
How light or dark the color is; brightness or darkness of the color
Both A and D
Teeth have value ranges at the light end of the value scale
47
What is
shearing force
in the context of dental materials?
The force that is applied when biting down on an object.
Applied when two surfaces slide against each other in the same direction.
The force that compresses materials down when chewing.
Applied when two surfaces slide against each other in opposite directions.
48
Which of the following best describes
indirect restorative
materials in dentistry?
Materials that are applied directly to the tooth surface.
Materials that are only used for orthodontic purposes.
Materials that are used for temporary fillings.
Materials used to fabricate restorations outside the mouth.
49
What is
tensile force
in the context of dental materials ?
The force that is applied to compress an object
The force applied in opposite directions to stretch an object.
The force that is applied to twist an object.
The force that acts perpendicular to an object.
50
What agencies are responsible for setting standards and specifications of dental materials?
ADA and FDA
CDC and WHO
ISO and OSHA
EPA and ASTM
51
Corrosion is of greatest concern for which of the following restorative materials ?
Amalgam
Composite resin
Gold
Porcelain
52
What are the characteristics of a
intermediate restoration
in dentistry?
Restorations that are a permanent solution to dental issues.
Placed for a limited amount of time, but can extend from weeks to a month.
Restorations that require extensive surgical procedures.
Restorations that a used for short periods of time.
53
What does Personal Protective Equipment (PPE) consist of ?
Eyewear and gloves
A gown and gloves
gloves, mask, and gown
gloves, masks, gowns, eyewear, &other protective equipment for the employee
54
The internal reaction to an externally applied force is called
Stress
Elasticity
Strain
Hardness
55
A dental clinic is having issues with bio-aerosol management; would be most effective in reducing bio-aerosol exposure.
Install new HVAC system and provide pre-procedural mouth rinses.
Limit the use of rubber dams and avoid volume suction.
Only use PPE and ignore ventilation techniques.
Increase the use of the manual suction and reduce PPE.
56
The type of primary bond where atoms share electrons in their outer shell is called
Atomic bond
Covalent bond
Ionic bond
Metallic bond
57
Resistance to flow is know as
Film thickness
Thixotropic
Density
Viscosity
58
What does the term '
chroma
' refer to in the context of dental materials and the color of the tooth?
The intensity or strength of the color; teeth are rather pale in color.
The texture of the surface or the tooth; does not effect the color of teeth
The brightness of a color; teeth are rather dark in color.
The transparency of the color; teeth are rather opaque in color.
59
What are
dual set materials
in dentistry?
Materials that are used only for temporary restorations.
Materials that only polymerize through chemical reactions.
Activated when chemicals are mixed but can be sped up by light curing.
Materials that do not require any activation to harden
60
On a hazardous material label the white label means special hazards: oxidizers, water reactive, Simple Asphyxiants
False
True
61
Which of the following is a recommended practice to minimize chemical exposure in a dental office?
Ignoring manufacture instructions
Using non-latex gloves only
Wear PPE, chemical spill kits, and follow instructions,& avoid skin contact
Storing chemicals in open containers
62
When the weight of a material increases in relationship to its volume, this is described as
Dense
Elastic
Resilient
Hard
63
What are the characteristics of a
temporary restoration
in dentistry?
Materials used for indirect restorations
Restorations that are long-lasting.
Restorations expected to last several days or weeks (temporary crown)
Placed in the mouth for a limited time, but can extend to weeks to months
64
What are the
physical properties
of dental materials ?
Those that can not be observed.
Those that can be observed and measured without changing the material.
A subset of physical properties & a material's ability to resist forces
Those that can be observed and measured by changing the material.
65
What are
direct restorative
materials in dentistry?
Materials that are used for indirect restorations.
Materials that are used only for temporary fillings.
Restorations that are placed directly into a cavity preparation.
Restorative materials that require laboratory processing
66
Explain the significance of classifying dental materials into metals, ceramics, polymers, and composites.
It allows for better understanding of material properties&their application
It simplifies the manufacturing process of dental products.
It reduces the cost of dental treatments.
It helps in selecting materials based on aesthetic preferences.
67
What is
compressive force
in the context of dental materials?
The force applied to compress or squeeze an object.
The energy needed to permanently deform a material.
A twisting force that has tensile and compressive forces.
The maximum amount of stress an object can hold.
68
A defining characteristic of a solid is that is has
Volume but no shape
Shape and volume
Shape only
No shape or volume
69
Initial set time
is the end of working time and it occurs when the material no longer can be manipulated in the mouth.
True
False
70
Mixing time is the length of time from
The beginning of mixing to the initial set time
The beginning of mixing to the beginning of working time
The beginning of mixing time to the end of setting time
the beginning of mixing to the end of working time
71
How are we
promoting awareness
of dental materials?
To regulate the different dental products on the market
By telling your friends and family.
Awareness of the overall success of a particular material's properties.
Recognizing dental materials that are present in the oral cavity.
72
Explain the significance of using
light activated materials
in dentistry and how they function.
They are used to enhance the aesthetic appearance by changing color.
They are designed to be used in environments w/ high moisture.
They are primarily used for their thermal conductivity properties.
Require a specific wavelength of light to initiate reaction stage to harden
73
When increasingly high forces are applied to a material it will eventually fracture and that point is called
Ultimate Strength
Compressive Strength
Fatigue fracture
Tensile strength
