Dental Materials
Dental Materials Knowledge Quiz
Test your knowledge on dental materials with our comprehensive quiz featuring 75 challenging questions! This quiz covers historical advancements, material properties, and safety protocols in dentistry. Perfect for students, educators, and professionals looking to refresh their understanding of dental products.
- Explore topics from amalgam to tooth restoration
- Enhance your knowledge of dental safety and regulations
- Engage with detailed questions designed for various skill levels
What was the "Amalgam War" fought over?
Mining rights in states in the Western region of the United States
The price of silver in relation to tin and zinc
The value and safety of silver dental amalgam
Patent issues between France and England
What was Dr. Frederick Mckay credited for?
Developing an acceptable formula for silver dental amalgam
Nothing dental fluorosis in Colorado Springs
Demonstrating a casting method to produce gold inlays
The introduction of dental cements
Dental materials considered devices, as well as over-the-counter products sold to the public, are subject to control and regulation of the ____ Center for Devices and Radiological Health
Food and Drug Administration
Drug enforcement Administration
Centers for disease Control and Prevention
Department of Human and Health services
Which of the following statements is true concerning the American Dental Association (ADA)Seal?
All dental products qualify for the Seal
It helps consumers make informed decisions about the safety and efficiency of products
The ADA Seal is usually awarded for the life of the product
Once a product has been accepted, it does not need to be reevaluated if its composition changes
Which of the following is not a classification of dental materials?
Preventive
Biological
Restorative
Therapeutic
The first acceptable amalgam formula was developed by _____ in 1895
G.V. Black
Pierre Fuchard
Dr. Frederick McKay
Dr. William Taggart
What is today's approach to dental care referred to as?
Individualized care
Comprehensive care
Science-based dentistry
Evidence-based dentistry
According to the earliest historical mention, in which location was fluoride first used?
China
Prussia
England
Colorado Springs
Silver paste was first mentioned as a restorative material for teeth by the:
Chinese
Greeks
Romans
French
______force is applied when two surfaces slide against each other in opposide directions
Compressive
Shearing
Tensile
Axial
Stress is the amount of force exerted from within an object, and _____ is the amount of change that the force has produced.
Strain
Tension
Compression
Chemical bonding
The normal resting pH of saliva ranges from 6.2 to _____, which is neutral.
1
6.6
7
14
Which of the following is true of galvanism?
It is an electrical current transmitted between two similar metals.
It is observed in patients with composite resin but not silver amalgam restorations.
Galvanic stimulation will decrease with time as oxides form on the surface of the metal
The salts of the saliva inhibit the movement of electrical current from one type of metal to another
What is percolation?
The rate at which heat flows through a material
A form of chemical rather than mechanical retention
Something that helps seal the interface between tooth and restorative material
Something that allows the ingress of bacteria and oral fluids and may lead to recurrent caries, staining, and pulpal irritation
Which of the following is the best thermal conductor?
Gold
Dentin
Enamel
Ceramic
Which of the following statements is true for the property of wetting as related to dental materials?
The Teflon surface of cooking equipment has good wetting
A thin film of dental cement is desirable to cement crowns
Liquids generally spread better over low surface energy surfaces
A surface has high surface energy when liquids bead up on the surface
Which of the following restorative materials has a coefficient of thermal expansion and thermal conductivity closest to enamel?
Gold
Amalgam
Porcelain
Composite resin
____refers to the intensity or strength of the color
Hue
Value
Chroma
Opacity
Which of the following would not be an adverse effect of a material?
Toxicity
Hyposensitivity
Hypersensitivity
Postoperative sensitivity
When an object cannot resist force ,_____ occurs
Deformation
Distortion
Deformation and distortion
Some materials give off heat when mixed. What is this called?
Chemical reaction
Exothermic reaction
Thermal conductivity
Coefficient of thermal expansion
Which of the following are considered to be personal protectice equipment (PPE)?
Protective shields on model trimmers and on collection bins for lathes
Dust or surgical masks, eyewearm gownsm and hair coverings or tiebacks when appropiate
Surface and immersion desinfectants
Plastic wraps and covers
Which of the following is a symptom of acute chemical toxicity?
Cancer
Neurologic defects
Nausea
Infertility
A substance is defined as being corrosive if the pH is less than _____or greater than 12.5
1.0
2.0
5.0
7.0
Which of the following would not be considered part of the PPE for laboratory purposes?
Gloves
Rubber dam
Safety glasses
Respiratory mask
Exposure to chemicals over a prolonged period of time is ______ exposure
Chronic
Acute
Latent
Which of the following is true for control of a mercury spill?
Mercury can be absorbed through the skin, but as a metal it is very dense, and there is no risk of inhalation for mercury vapors
The spill kit for small amounts of mercuty should contain a handheld vacuum cleaner
A mask and utility-type gloves should be worn whenever cleaning a mercury spill
None of the above
What would a mercuty spill kit include?
2 x 2 gauze
Vinyl gloves
A special brush
Absorbent powder
If a staff member is splashed in the face with a caustic chemical and some goes into the eye, what should he or she do?
Flush eyes at the eye wash station
Wash eyes with soap and water
Wipe eyes with a damp cloth
Shower immediately
What is the purpose of the Safety Data Sheet (SDSs)?
Provide information regarding the manufacturer
Provide instructions for product use
Provide instructions in case of spill
All of the above
Which of the following causes of tooth sensitivity may be successfully treated with a desensitizing agent?
Dental caries
A cracked tooth
A leaking restoration
Exposed dentinal tubules
Where is resin infiltration most successfully used?
In pits and fissures
In early cavitation
On interproximal surfaces
On smooth surface white spots
How can dentures be cleaned by the patient at home?
Antibacterial soap
Denture soak tablets
Using a soft brush made for dentures
All of the above
Which of the following statements is true for bonding orthodontic brackets?
Orthodontic brackets have replaced bands for many uses, especially in the posterior part of the mouth
Because brackets cannot be used with conventional cemets, they must be bonded to the enamel using adhesive materials
Only self-cured adhesive bonding resins can be used for bonding orthodontic brackets
Orthodontic brackets must be directly bonded; there is no indirect method of application of brackets
Which of the following is true of in-office care of a complete denture
Patients will not form calculus on a denture
Tissue bearing surfaces of the complete denture shoud be polished during cleaning
It is helpful for the patient if the teeth and the acrylic base are worn down during the polishing process
Calculus can be removed by placing a prosthesis in a denture cleaning solution inside a zippered bag placed in an ultrasonic cleaner
Sources of dimensional change for polymeric materials include which of the following?
Accelerators and inhibitors
Thermal conductivity
Water sorption
Which of the following correctly represents the stages seen when acrylic powder and liquid are mixed together?
Dough, sandy, rubber, and stringy
Stringy, sandy, dought, and rubber
Sandy, stringy, dough, and rubber
Rubber, stringy, dough, and sandy
When a resin bonding agent hardens, it creates projection that lock into the tooth creating a ____bond. The resin bonding agent will then form a ____ bond to other resin placed over it, such as composite resin.
Chemical; chemical
Chemical; mechanical
Mechanical; chemical
Mechanical; mechanical
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
Which of the following is the worst type of sealant failure?
All of the sealant is lost
Part of the selant is lost
The sealant remains in place but leaks
Too much sealant is placed, resulting in excess material in the contact between adjacent teeth.
At which level, parts per million (ppm), of excess systemic fluoride will fluorosis begin to affect developing teeth?
1.5 ppm
2.0 ppm
2.5 ppm
3.0 ppm
Which of the following is TRUE of the smear layer?
It is composed exclusively of bacterial plaque
It is easily washed off with an air-water spray
It forms on the external surface of uncut enamel
It interferes with the formation of a bond to dentin and needs to be removed
The oxygen-inhibited layer is a very thin coating of uncured resin. Where is it found?
Withing the dentinal tubules
At the base of the polymerized bonding resin
On the surface of the polymerized bonding resin
Within intertubular and peritubular dentin, but not within dentinal tubues
Which of the following desensitizing agents is thought to work by passing through the dentinal tubules to the pulp and acting directly on the nerve?
Fluoride compounds in toothpastes, gels, or solution
Ferric or potassium oxalate solutions
Chemical solutions containin resin
Potassium nitrate
What is the purpose of adding fillers to pit and fissure sealant material?
Wear resistant
Increased bond
Esthetics
Which etch or tooth conditioner is used when seating or repairing ceramic restorations?
Acetic acid
Phosphoric acid
Hydrochloric acid
Hydrofluoric acid
For how many seconds should dentin be etched?
10
20
40
60
At what pH will tooth demineralization occur?
3.5
4.5
5.5
6.5
What is the result of the loss of monomer or inadequate pressure during processing?
A brittle material
Shrinkage of the material
Porosities in the material
Discoloration of the material
Polymerization of chemical-cured acrylic resin is set into action when the tertiary amine in the liquid activates the _____ in the powder to produce free radicals
Plasticizers
Hydroquinone
Benzoyl peroxide
Glycol dimethacrylate
Which factor would contraindicate dental sealants?
Deep, uncoalesced grooves
Shallow, well-coalesced grooves
Adult patients with high caries risk
What is the proper order for the steps of applying sealant?
Etch, clean, cure, seal
Clean, etch, seal, cure
Etch, seal, cure, clean
Clean, seal, cure, etch
Polymerization shrinkage is seen most readily in which of the following areas of a heat-cured acrylic resin dentire?
Labial flange
Alveolar ridge
Palatal
Hamular notch
Excess water left from the etching procedure is removed by gently drying with air:
Until the dentin is bone dry
But the dentin is left moist so that it glistens
But the dentin should be left wt with etchant for bonding
Where is fluoride's greatest anticaries benefit gained?
Topycal fluoride exposure before eruption
Systemic fluoride exposure before eruption
Topical fluoride exposure after the teeth have erupted
Systemic fluoride exposure after the teeth have erupted
The accepted optimal level of fluoride in the drinking water is ____ mg/L or parts per million
0.01
0.7
0.12
0.5
In conjunction with fluoride, which product would aid in tooth remineralization?
Phenolic compounds
Chlorhexidine
Essential oils
Antibiotics
When preparing to take an alginate impression, which of the following is NOT necessary?
Pack the material to mix
Wear a mask and eyewear
Have patient use antibacterial rinse
Use a try-in tray for fit
Impressions taken with polyvinyl siloxane should be poured within
30 minutes
1 hour
1 day
1 week
When should impressions be disinfected?
At the dental lab check-in
Before rinsing with water
At the chairside upon removal
For an hour before pouring in gypsum
Which of the following elastomers are the most hydrophilic?
Polyethers
Polysulfides
Addition silicones
Condensation silicones
Which statement is correct regarding alginate hydrocolloid?
Fast-set alginate has a working time of 2 to 3 minutes
Some moisture will be lost from the impression even in 100% humidity
Alginate hydrocolloid should be removed slowly to prevent deformation of critical surfaces
Adjusting the powder-to-water ratio is the best way to lengthen or shorten the setting time
Which of the following statements is true regarding dimensional accuracy of gypsum products?
Plaster has the least amount of setting eexpansion
Plaster has the least amount of setting contraction
High-strength stones have the least amount of setting expansion
High-strength stones have the least amount of setting contraction
Which of the following is the most widely used dental impression material?
Reversible hydrocolloid
Irreversible hydrocolloid
Addition of silicone impression matereial
Condensation silicone impression material
When mixing alginate, as the water temperature increases, the working time
Increases
Decreases
Stays the same
The completed impression forms a _____ reproduction of the teeth and tissues, and the replica or model forms a ____ replica of the teeth and tissues
Positive; positive
Positive;negative
Negative; positive
Negative; negative
What is the ideal time frame for pouring an alginate impression?
An hour
A day
A week
A month
What could occur if a cast is made from an improperly disinfected impression
Will not harbor microorganisms
Should be immersed in solution
Should be stored for 24 hours first, then sprayed w/ a desinfectant
Cannot be disinfected, so start over
Which of the following gypsum products is ideal for making full or partial denture models, orthodontic models, and casts requiring higher strength and abrasive resistance?
Impression plaster (Type I)
Model plaster (Type II)
Dental stone (Type III)
Dental stone, high strength (Type IV)
Mixed alginate should be loaded into the impression tray in _____ increments as _____ as possible
Large; quickly
Large; slowly
Small; quickly
Small; slowly
Which of the following impression materials has the smallest dimensional change on setting of all elastomeric and hydrocolloid impression material?
Polyether
Polysulfide
Addition silicone (PVS)
Condensation silicone
Which of the following is an elastic impression material
Impression wax
Impression plaaster
Vinyl polyether silicone
Dental impression compoud
How is agar different from alginate impression material?
It is the same as alginate
It is irreversible
It is reversible
What does it mean when freshly mixed gypsum loses its gloss?
Beginning of the working time
Final compressive strength
Initial set
Final set
Of the items listed, which would NOT be made from an alginate impression?
Mouth guard
Bleaching tray
Retainer
Onlay
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