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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

75 Questions19 MinutesCreated by PolishingTooth32

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.

6.6

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?

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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