WorksheetsDental Materials Review 2022
Total questions: 55
Worksheet time: 18mins
The most commonly used etchant or conditioner for tooth bonding is _____ in concentrations ranging from 10% to 38%.
Acetic acid
Phosphoric Acid
Hydrochloric acid
Sodium Perborate
The etched surface of a permanent tooth should have a/an _____ appearance when dried.
opaque
Frosty
Transparent
Darkened
What is the purpose of dental bonding?
To remove the smear layer.
To etch the enamel.
To seal the margins.
To provide adhesion.
When does microleakage occur?
Poorly sealed margins
Contaminants
Percolation
Shrinkage
Which of the following is correct regarding the dual-cure process for resin bonding agents?
Can be activated by light or can cure chemically without application of the curing light
Requires chemical curing rather than activation by light
Requires activation by light
Neither can be activated by light or cured chemically
Which of the following is a direct-placement esthetic material?
Composite resin
Silver amalgam
Porcelain inlay
Full gold crown
The smear layer is
not removed when bonding by the etch-and-rinse technique
easily removed by rinsing with water
a tenacious layer of cut tooth debris on the surface of enamel and dentin
necessary for good bonding
Which one of the following statements about bonding to enamel is true?
Bonding is achieved by chemical bonds.
Bonding to enamel is less reliable than bonding to dentin.
Bonding is achieved by micromechanical retention.
Bonding is achieved by resin tags penetrating the collagen matrix.
Self-etching bonding systems
Require rinsing after etching
Generally etch enamel equally as well as dentin
Use 37% phosphoric acid as the etchant
Use acidic primers to etch the tooth structure
The function of the wedge placed interproximally with a class II preparation includes all of the following except one. Which one is this exception?
Create slight separation of the teeth
Seal the matrix band against the tooth at the gingival margin
Protect the gingival papilla during cavity preparation
Stop bleeding
Common effects of polymerization shrinkage of composites may include all of the following except one. Which one is this exception?
Microcracking of enamel causing white lines around the margins
Postoperative sensitivity
Microleakage
Death of the pulp
The purpose of a silane coupling agent for composite resins is to
reduce the oxygen-inhibited layer
help the various layers stick together
help the composite retain its color
improve the bond between the filler particles and the resin matrix
Which of the following is true of computer-aiding machining for crown and bridge techniques?
No die needs to be poured, and no temporary crown is necessary.
It is available only for the fabrication of porcelain veneers.
A porous ceramic core is infiltrated with molten glass by capillary action.
Ceramic powder is mixed with a water-based liquid to form a mass that is pressed onto a porous refractory die.
The main advantage of all-ceramic crowns over porcelain-bonded-to-metal crowns is
Strength
Better esthetics
Ease of cementation
Ease of shade matching
An in-office CAD/CAM system for ceramic restorations provides all of the following advantages except one? Which one is the exception?
A provisional crown is not needed
The patient does not need local anesthetic
Fabrication of restoration is completed in-house (office)
The procedure can be completed in 1 visit
The number one reason for sealant failure is
contamination from saliva
applying the fluoride varnish too soon
not properly cleaning surface
not curing for appropriate length of time
How long do you mix zinc phosphate?
1 minute
3 minutes
30 seconds
1.5 to 2 minutes
According to GV Black, pit & fissure caries are
Class I
Class II
Class III
Class IV
Class V
Which impression materials are rigid?
polysulfides & silicone
wax & hydrocolloid
compound & wax
compound & plaster
What is a disadvantage of using alginate as an impression material?
Hydrophilic
Shrinkage
Expense
Toxic to patient
Dental implants are made of all of the following materials except______________
Hydroxyapatite
Ti-6AI-4V titanium
cp TI- titanium
vitreous carbon
The forces needed to pull a bonded material off/from the tooth is
macromechanical failure
megapascal
van der Waals force
micromechanical faliure
Which of the following is not a contraindication for tooth whitening?
intrinsic stain
pulpal necrosis
endodontic therapy
amalgam staining
Which composite has low viscosity making placement easier?
Condensable composite
Flowable composite
Compomers
Preventive resins
The dental material that can be used as a cement, impression material, & periodontal dressing.
Gutta percha
Glass ionomer
Alginate
ZOE
The first adhesive restorative material in dentistry that can be used a restorative material and a cement
BIS-GMA
Glass ionomer
Polycarboxylate
Amalgam
The hydrocolloid material that sets via a chemical reaction.
irreversible hydrocolloid
reversible hydrocolloid
surfactant hydrocolloid
polyether
The most important thing to remember, when working with any dental material is
the temperature of the room
using the correct amount of product
follow the directions the dentist provides
reading/following the manufacturer's directions
The initiator is used with heat and some chemically activated acrylic resins.
carbon dioxide
benzoyl peroxide
BisGMA
hydroquinone
Which of the following types of cement releases fluoride?
ZOE
Glass ionomer
Zinc Phosphate
polycarboxylate
The chemotherapeutic agent containing 1mg of minocycline microspheres.
Atridox
Arestin
Periochip
Systemically delivered antibiotics
Obstructive sleep apnea devices advance the __________
Maxilla
Mandible
both maxilla and mandible
Forces tongue to palate while sleeping
In-office whitening procedures use what concentration of hydrogen peroxide?
10-15%
20-25%
30-35%
40-50%
Joining two objects together, with glue or cement, is called ___________
Luting
Adhesion
Percolation
Shearing
The dental cement mixed on a cool, glass slab due to its exothermic reaction is
ZOE
Glass ionomer
Calcium hydroxide
Zinc phosphate
The term used to describe a slow change in shape caused by compression.
Percolation
Microleakage
Creep
Delayed expansion
A material that can be heated and molded/shaped after the polymerization reaction.
Thermoplastic polymer
Thermoset polymer
Free radical
Monomer
Recommend disinfection time for an alginate impression is
5 minutes
10 minutes
15 minutes
30 minutes
Property of a material that contracts when cooled and expands when heated.
Coefficient of thermal expansion
Modulus of elasticity
Goldilocks' principle
Heat capacity
Mechanical property permitting considerable elastic deformation; but returns to original form is
Thermoplastic polyomer
Elastomeric
inelastic
micro elastomeric property
What is the fi nal setting time of gypsum?
10-15 minutes
20 minutes
60 minutes
90 minutes
Melting at a higher temperature than the boiling point and gelling when placed in the mouth is
syneresis
hystereses
imbibition
gelation
Dental adhesives utilize which type(s) of bonding?
Chemical
Macromechanical
Macromechanical and micromechanical
Chemical and micromechanical
Which statement is not correct regarding acrylic denture teeth?
They are easy to grind and reshape
They are the most commonly used denture teeth.
They wear down the opposing natural or artificial teeth.
They are made in layers to simulate the colors and translucencies of natural teeth.
The _____ implant is the most commonly used in dentistry today.
endosseous
Supraperiosteal
Subperiosteal
Transosteal
Why are endosseous implants more successful in the mandible than in the maxilla?
Blood flow is better in the mandible
The bone in the mandible is generally much denser than in the maxilla.
Gravity drags maxillary implants from their sockets.
There is a greater lateral component of force on maxillary teeth than on mandibular teeth
What is an acrylic guide essential to proper implant placement called?
Stent
Splint
Retainer
Blueprint
Non-absorbable sutures are usually made of silk and need to be removed. Absorbable sutures are made from the intestines of cattle, sheep, or goats and are absorbed or dissolved in the patient’s oral cavity.
Both statements are true.
Both statements are false.
The first statement is true. The second statement is false.
The first statement is false. The second statement is true.
_____ force is applied when two surfaces slide against each other in opposite directions.
Compressive force
Shearing force
Tensile force
Axial force
Stress is the amount of force exerted from within an object, and _____ is the amount of change that the force has produced.
Tension
Compression
Strain
Chemical bonding
_____ time is the time permitted to manipulate the material in the mouth.
Mixing
Working
Initial set
Final set
Which particulates are smaller than 50 microns?
Dust
Aerosols
Mold
Splatter
Through which medium is dust generated and inhaled?
Particulate matter
Living mist
Bio-aerosol
Infectious waste
Resistance to flow is know as
Wetting
Viscosity
Film thickness
Density
When deformation (change) is not permanent and a material recovers it has good
Malleability
Ductility
Toughness
Elasticity
