WorksheetsDental Materials Quiz
Total questions: 60
Worksheet time: 30mins
One of the most effective ways of improving the marginal seal and mechanical bonding of composite resins to the tooth structure is to….
Pretreat enamel
Condition or pretreat enamel of the preparation
Perform a prophy before restoring tooth
Increasing the curing time
What is the main difference between a liner and a base?
Bases are used in bulk to replace dentin
Liners are used in bulk to replace dentin
Bases and liners are used the same
Bases are used in a thin layer to replace dentin
You are about to take alginate impressions on a patient. What can you do to help prevent the patient from gagging during this procedure?
Work quickly
Use warm water
Seat patient upright
Have patient breath through nose
Tell patient to hold tight its almost over
Work quickly
Use cold water
Seat patient upright
Have patient breath through nose
Work quickly
Lay patient back
Use warm water
Have patient breath through nose
Fluoride concentration of stannous fluoride (SnF2)…
1.5%
2.33%
1.23%
1.68%
All of the following are contraindications to the placement of sealants except…
Caries on occlusal surface
Unable to maintain dry field
Deep pit and fissures
Smooth occlusal surface
Polycarboxylate cement adheres to …
Dentin
Enamel
Metal
All of the above
What are the 2 most frequency quoted disadvantages of the rubber dam?
Time consumption
Patient Objection
Does not work well
Cost
Patient objection
Cost
Cost
Time consumption
Which one of the following is the most irritating to the pulp?
ZOE
Calcium hydroxide
Zinc phosphate
Glass ionomer
Which characteristic of color refers to color families?
Tint
Shade
Hue
Darkness
All of the following are components of sodium fluoride paste, which is used to treat hypersensitive root surfaces except….
Sodium fluoride
Borax
Kaolin
Glycerin
When attempting to isolate an operating field in the oral cavity, which method would be the best to use?
Cotton rolls and suction
Rubber dam
Dry angle and suction
Dental assistant and cotton rolls
Which of the following are proper procedures for mixing gypsum?
Add water to the powder
It doesn’t matter as long as its mixed
Gypsum is already mixed and ready
Addition of powder to water
What factors affect the rate of abrasion during polishing?
Pressure of application
Speed
Size of abrasive particles
Sharpness of abrasive particles
All of the above
Where should alginate impressions be disinfected?
In Lab
In sterilization area
In Treatment area
In Kitchen
The most serious limitation of the visible light cured posterior composite restoration is:
Polymerization shrinkage
Not able to keep a dry field
Composite expanding
Light not completely curing composite
The liner which best stimulates the development of reparative dentin is
oil of clove
copal varnish
calcium hydroxide
zinc oxide eugenol
A cement base is utilized on badly decayed teeth before the filling is placed in order to insulate and protect the pulp
both the statement and reason are true
both the statement and reason are false
the statement is true, but the reason is false
the statement is false but the reason is true
Which of the following could be used as a final polish for gold, ceramic, amalgam, or composite restorations in the mouth?
rouge
pumice
tin oxide
prophy jet
A newly placed silver amalgam restoration adjacent to a cast gold crown might cause
syneresis
galvanism
microleakage
thermal expansion
The most effective way to insulate the pulp of a tooth is to ...
use a liner
use a base
restore it with a cast gold grown
restore it with a chrome-steel crown
The gypsum product with the least compressive strength is
stone
plaster
improved stone
none of the above
A cantilevered bridge can be easily identified radiographically because
porcelain is radioopaque
it always has an open contact
it is always made of cast gold
it is only supported on one side
Fluffing (aerating) alginate before using it
prevents syneresis
accelerates the set
prevents imbibation
compensates for settling or particle compaction due to storage
A benefit of light-cured composites over self-cured composites is:
that they require no mixing
they have reduced porosity
both a and b
none of the above
Zinc phospate cement helps keep a crown in place by its:
ability to release fluoride
high chemical affinity for dentin
ability tp generate heat when mixed
mechanical interlock between crown and tooth
The setting rate of an irreversible hydrocolloid may be slowed safely and effectively by:
Increasing the spatulation time
decreasing the ratio of water to powder
decreasing the temperature of the mixing water
increasing the temperature of the mixing water
A force exerted to stretch a material to the point of fracture indicates its
ductility
malleability
tensile strength
compressive strength
An interproximal composite on an anterior tooth is classified by G. V. Black as a
Class I restoration
Class II restoration
Class III restoration
Class IV restoration
Pyrophosphates are added to commercial toothpaste preparations to prevent tartar accumulation. Triclosan is sometimes added as an antimicrobial agent.
Both statements are true
Both statements are false
Only the first statement is true
Only the second statement is true
The contraction of a gel due to a loss of solvent is called:
syneresis
adhesion
imbibition
malleability
A material is highly ductile
will easily break when stretched
can undergo a change of form without breaking
will generate an electrical current in an acidic environment
can recover its original shape after having undergone a force
Silver amalgam alloys contain copper to
minimize galvanism
reduce the rate of corrosion
reduce thermal conductivity
improve compressive strength
Contraindications to implant placement include:
Inadequate bone
Uncontrolled periodontal disease
History of biphosphonate therapy
All of the above
A leading cause of dentinal hypersensitivity is due to the incorporation of what ingredient in toothpaste?
baking soda
pyrophosphates
potassium nitrate
hydrogen peroxide
One of the benefits of using ionomer cement is that...
it releases fluoride
it is mixed with polyacrylic acid
it has a high chemical affinity for enamel
it undergoes an exothermic reaction when mixed
Prosthodontics is the branch of ------------------------ and deals with replacement of ------------------------
dentistry--
infected teeth
dentistry--
costmetic restoration
dentistry--
missing teeth
dentistry--
extractions
What is this
dental cast
plaster mold
mandibular arch model
primary teeth model
Dental Plaster is ------------------- hemihydrate
Alpha
Delta
Semi
Beta
Three Gypsum products in this --------------
Dental plaster
Dental stone
Study model stone
Dental plaster
Dental white plaster
Die Stone
Dental plaster
Dental white plaster
Study model stone
Dental plaster
Dental stone
Die Stone
Examples of Impression materials are all except
Impression plaster
Green stick compound
ZOE paste
Sticky wax
What is this
Impression compound
Impression wax
Tray compound
Modelling wax
Chemically setting impression materials are also called as
Thermophysical
Thermochemical
Thermosetting
Thermoplastic
Impression compound is ----------------- material
Flexible and thermoplastic
Rigid and thermoplastic
Flexible and
water resistant
Rigid and water resistant
This arch is ---------------- mandibular arch
Partially edentulous
Completely edentulous
Fully edentulous
Half edentulous
Strength of Gypsum products can be --------------
Dry and wet strength
Dry and brittle
Wet and flexible
Unreliable depending on how it is mixed
The correct term for describing the maximal amount of stress a material can withstand without breaking is
toughness
elasticity
ultimate strength
ductility
Porcelain restorations have
great stain resistance
low wear resistance
high strength
easy reparability
Which of the following represents the correct hardness ranking, from hardest to softest
gold, amalgam, composite, enamel
enamel, amalgam, gold composite
composite, enamel, gold, amalgam
amalgam, enamel, composite, gold
After polishing a patients teeth you notice scratches on a gold crown; the following most likely contributed to these scratches:
Use of an inappropriate polishing agent
Corrosion of the crown
improper toothbrushing
none of the above would contribute to scratches on the crown
When a soft mouth guard is prescribed by the dentist, fabrication can be done by:
the dental assistant
the dental hygienist
the laboratory technician
All of the above
Which one of the following statements about space maintainers is TRUE
They are always cemented into place
They are used only when primary teeth are lost
They prevent teeth adjacent to the space from drifting into the space
Denture teeth are never used in conjunction with space maintainers
Which of the following can remove intrinsic stains?
Prophy cup with polishing paste
hydrogen peroxide
air polishing with sodium bicarbonate powder
ultrasonic scaling
After whitening, how much time should a patient wait until a shade is selected for permanent restorations?
1 week
2 weeks
3 weeks
1 month
If caries in a fissure is undetected and is inadvertently covered by a well placed sealant, what will happen?
Caries will progress rapidly
Caries will progress slowly
Caries will stop progressing
Application of Silver Diamine Fluoride _______ times per year has shown to arrest caries at 90%
1
2
3
4
Fluoride varnish can remain on the teeth for _____days with light brushing
1 to 3
1 to 2
1
When enamel is remineralized with fluoride..
it is a different color
the fluoride contains a poison that kills all bacteria associated with dental caries
The resultant remineralized crystal is more resistant to acids
All of the calcium is replaced
Polymerization shrinkage of a composite
is cause for alarm
is greater than 10% of the volume
can be minimized by placing and curing a series of small increments
has no effect of the final restoration
Fillers are composed of all of the following except one:
Quartz
Alumina
Silica
Glass
Nano-ionomers have all of the following properties EXCEPT one:
Improved esthetics
Increased wear resistance
improved polish
greater strength than noncomposites
