Dental Materials Study Guide

Pushing two object against each other with an axis is an example of _________ stress. A: compressive B: tensile C: shear D: all of the above

C

The process of setting of a material is correctly referred to as A: gelling B: hardening C: curing D: triturating

C

To adjust the occlusion on a recently placed amalgam, the patient should be instructed to bite ___ on the articulating paper A: firmly B: and rotate repeatedly C: lightly D: and open and close again

C

When compared to zinc phosphate cement, which statement regarding polycarboxylate cement is correct? A: it forms a mechanical bond to tooth structure B: it is generally used as a temporary sedative cement C: it is less irritating to the pulp D: it is mixed on a glass slab

C

Which cement that gives off an exothermic reaction and must be spatulated over a wide area on a cool, dry, thick glass slab? A: ZOE B: polycarboxylate C: zinc phosphate D: composite resin

C

Which is not true of micro-leakage? A: it is caused by different rates of expansion and contraction of tooth structure and restorative materials B: it is the minute space between the restoration and the tooth structure C:it occurs rarely D: it allows fluid and debris to enter between the restoration and the tooth

C

A liquid with high viscosity _____ flow easily and _____ effective in wetting a surface. A: does; is B: does; is not C: does not; is D: does not; is not

D

Retention holds a material in place and seals the structures together. true or false

False

When a varnish is used, it is always used before other materials. True or false

False

A desensitizer could be indicated for which of the following procedures? A: amalgam restoration B: sealants C: provisional coverage D: fluoride application

A

A temporary restorative material should be selected to restore a tooth that has A. sensitivity. B. a missing cusp. C. been prepared for a cast restoration. D. been prepared for a porcelain veneer.

A

A(n) ____________ is defined as a mixture of two or more metals. A: alloy B: amalgam C: ceramic D: porcelain

A

All of the following are steps in finishing a composite restoration except: A: burnishing B: reducing composite C: fine finishing with disks and burs D: polishing with strips and paste

A

An example of enamel bonding is the placement of a: A: dental sealant B: dental varnish C: calcium hydroxide D: dental base

A

Calcium hydroxide liner is a frequently used liner because it: A: stimulates production of reparative dentin B: can be used with only composite resin material C: acts as a base as well as a line D: does not require the use of a filling material

A

Dental bonding is also referred to as: A: dental adhesion B: a dental liner C: a desensitizer D: none of the above

A

Dental varnish is used in the cavity preparation to: A: seal dentinal tubules and reduce leakage around a restoration B: insulate the pulp from thermal changes C: stimulate growth of reparative dentin D: obtund pain

A

Etching for dental bonding is down with: A: phosphoric acid B: ammonia C: isoprophyl alcohol D: hydrogen peroxide

A

Ideally, composite resin shades should be chosen in: A: daylight B: normal ambient light C: bright light D: operatory light

A

Materials that are versatile in their uses, such as for specialized bases, include: A: dental cements B: dental varnishes C: dental liners D: calcium hydroxide

A

Mixing alloy and mercury together to from a mass is called: A: amalgamation or trituration B: curing C: condensing D: percolation

A

One of the fastest and most cost effective ways of restoring the esthetic appearance of teeth is A: bleaching B: porcelain veneers C: composite veneers D: ceramic crowns

A

The curing process in which it is the most critical that the materials are mixed and placed within working and setting times is with A: auto-cured materials B: light-cured materials C: dual cured materials D: none of the above

A

The silver filling material used for more than 150 years to restore primary and permanent teeth is called A. amalgam. B. composite. C. glass ionomer. D. acrylic resin.

A

To ensure an accurate ratio of alloy and mercury, the best protocol to follow is to A: use premeasured capsules B: measure the powder and liquid accurately C: use reusable capsules with a pestle D: use a mercury dropper and pellet and hand mix in a mortar

A

Which of the following materials used as a base needs to set at least 5 minutes before placing the restoration? A: polycarboxylate cement B: ZOE C: zinc phosphate D: desensitizing materials

A

Which of the following would be the material of choice as an insulating base under a composite restoration? A: glass ionomer B: calcium hydroxide C: cavity varnish D: zinc oxide-eugenol

A

Which restorative materials are not esthetically pleasing? A: amalgam B: composite C: porcelain D: both A and B

A

Which type of glass ionomer cement is designed for cementation of indirect restorations? A: I B: II C: III D: IV

A

You are asked to select a base for a deep cavity preparation that is uncomfortable due to extensive caries. Which would you select? A: ZOE B: zinc phosphate C: polycarboxylate D: glass ionomer

A

Zinc phosphate cement should be mixed: A: on a cool glass slab B: on a warm glass slab C: on a paper pad D: with an amalgamator

A

_____ is added to dental amalgam alloy powder for strength. A. Silver B. Tin C. Copper D. Zinc

A

A 1:1 mercury to alloy ratio is known as the A: golden proportion B: Eames technique C: coupling agent D: G.V Black Classification of Cavities

B

A necessary step in preparation of dentin bonding is application of A: an etchant and addition of the smear layer B: an etchant and removal of the smear layer C: calcium hydroxide D: cavity varnish

B

All of the following are true about the application of etchant material except: A: the tooth must be free of debris B: the tooth must be throughly dried C: the etchant gel is placed only where needed D: it is cured for 15 to 30 seconds

B

Before they can be marketed, new dental materials must undergo strict evaluation by the A: FDA B: ADA C: MDA D: ADAA

B

Calcium hydroxide: A: cannot be placed under direct composite resins because it will inhibit polymerization B: stimulates the production of reparative dentin C: functions as a thick base to support extensive restoration D: consists of a resin in and organic solvent

B

Dental restorative materials that are applied, while pliable, to a tooth or teeth that can be adapted, carved, and finished are classified as: A: indirect restorations B: direct restorations C: crowns and bridges D: implants

B

For adhesion to take place, ________ film thickness is desired A: a thick B: a thin C: a medium D: any

B

How long is the etchant material applied to the tooth being prepared for used on a bonding material? A: 5 to 10 seconds B: 15 to 20 seconds C: 1 minute D: it is left on the tooth and is sealed in under the restorative material

B

How should cement be placed into an indirect restoration for delivery? A: fill casting until it is overflowing B: add a thin lining to cover all internal walls of the casting C: fill to the top margin of the crown D: add a think layer on the very bottom of the crown

B

How should dental cements be dispensed for mixing? A: incorporate the liquid into the powder B: dispense the powder first and then the liquid C: dispense the material the evening prior to beginning the procedure D: dispense by holding the bottle of liquid at a 45- degree angle to ensure accurate drop size

B

Insulating base should cover the entire __________ to a thickness of _______ mm. A: cavity preparation; 1 to 2 B: pulpal floor; 1 to 2 C: cavity preparation; 2 to 3 D: pulpal floor; 3 to 4

B

Light- cures composite resin material are supplied in all of the following ways except which one of the following? A: light- cured composite resin materials may be supplies in a lightproof syringe B: light cured composite resin materials require mixing C: light-cured composite resin materials are supplied in various shades D: light-cured composite resin materials contain both the photo initiator and the amine accelerator in one paste

B

Stretching a rubber band is an example of storing: A: compressive B: tensile C: shear D: all of the above

B

The ADA and the National Institute of Health-Nations Administration ______ the sue of amalgam as a posterior restorative material A: discourages B: supports C: forbids D: has no opinion

B

The addition of _________ alloy to glass ionomers produces a product that can be used for core buildups and the repair of fractured cusps and amalgam fillings as well as abutments for over dentures. A: copper B: silver-tin C: gold D: zince

B

The curing time of composite restoration is not influenced by the: A: manufacturer's instructions B: type of base used under the restoration C: thickness or size of the restoration D: shade of the restoration

B

The dental restoration created in the laboratory by the dental laboratory technician are classified as __________ restoration. A: direct B: indirect C: provisional D: amalgam

B

The instrument used to smooth the amalgam surface is: A: a condenser B: a burnisher C: a carver D: articulating paper

B

The purpose of packing the amalgam in the cavity preparation is to _____ it. A: amalgamate B: condense C: carve D: triturate

B

The smear layer is composed of: A: particularly dense enamel at the distino-enamel junction B: a very thin layer of debris remaining on the dentin after cavity preparation C: an oxygen inhibited layer on the surface of cut dentin D: a cery porous layer of cut ends of dentinal tubules

B

Varnish should be placed: A: in one thick layer B: in two light coats C: before a sedative base D: none of the above

B

What could occur if excess cement is left at the cavosurface margin of a crown? A: slowly dissolve, thus loosening the crown B: irritate the area and cause inflammation C: demineralize the enamel D: create an occlusal prematurity

B

What type of dental cement is used as an adhesive for permanent indirect restorations? A: temporary B: luting C: provisional D: liner

B

What would occur if there were a delay between mixing a luting material and placing the indirect restoration? A: decreased viscosity B: initial set begins C: improved thermal properties D: improved wettability

B

When are temporary cements used? A: cementing veneers B: placing a provisional crown C: cementing cast restoration D: restoring teeth

B

Failure to place a protective base under a restoration can result in: A: a premature contact on the restorative material B: occlusal trauma C: postoperative sensitivity and damage to the pulp D: premature loss of restorative material

C

Which of the following is an advantage to using glass ionomer as a restorative material? A. Glass ionomer has the ability to bind to teeth mechanically rather than chemically. B. Glass ionomer releases fluoride after their final setting. C. Loss of gloss indicates a proper mix of glass ionomer material. D. There is no need to avoid contact with water during the mixing procedure for glass ionomer.

B

Which of the following types of pulpal stimuli may be associated with traumatic occlusion? A: biological B: mechanical C: physical D: chemical

B

Which of the following would be the material of choice as an insulating base as well as a sedative base? A: zinc phosphate B: zinc oxide eugenol C: polycarboxylate D: all of the above

B

ZOE mixed to a base consistency should not be: A: thick and putty-like B: rolled into a one large ball C: placed to cover the entire pulpal floor D: tapped lightly into the preparation with a condenser

B

______________- occurs when a metal restoration is touched by a fork. A: microkeakage B: galvanic action C: sheer stress D: corrosion

B

A dental liner is placed: A: along the inside of cavity walls B: mesial and distal of the tooth C: in the deepest area of the tooth preperation D: along the interproximal margin

C

A noble metal used for cast restoration in dentistry is A: silver B: iron C: platinum D: zinc

C

A properly etched tooth will appear: A: shiny B: pitted C: frosted D: none of the above

C

A properly triturated amalgam mix should: A: be a hard mass B: contain dry particles C: be a soft, pliable mass D: separate when packed

C

All of the following are advantages of amalgam over composite as a restorative material except: A: cost B: moisture control C: esthetics D: strength

C

All of the following are true statements about in office tooth whitening except it A: can usually be done in one treatment B: requires a light accelerated bleach C: requires multiple treatments D: involves isolation of soft tissue

C

All of the following statements are true of the process of removing the smear layer in dentin bonding except: A: during preparation, thousands of dentin tubules are cut B: open ends of dentin tubules lead to sensitivity C: all moisture must be removed to assist in adhesion D: completely drying the tooth structure will harm the tooth

C

Corrosion of metal restorative materials A: is a reaction that occurs when metal is exposed to products such as temperature, humidity, and saline B: is easily removed with polishing agents. C: both a and b are correct D: do not occur

C

Desensitizers used to help prevent hypersensitivity should be used: A: in large amounts B: in contact with soft tissue C: to seal all affected dentinal tubules D: all of the above are correct

C

Etchant removes the __________ layer in preparation for bonding. A: varnish B: cavity liner C: smear D: sclerosing

C

Intermediate restorative material (IRM) is a A: zinc polycarboxylate cement B: composite resin C: zinc oxide-eugenol cement D: ceramic

C

Which od the following statements is true of the composition of tooth whitening materials? A: most tooth whitening products are made from a bleach based ingredient B: the tooth whitening solution coming in a single concentration of 37% C: When the product contact the teeth, it allows oxygen to enter the enamel and dentin, which whitens the colored substances

C

Which of the following correctly lists the different restorative materials from weak to strong? A: silver amalgam, gold alloy, composite resin B: silver amalgam, composite resin, gold alloy C: composite resin, silver amalgam, gold alloy D: composite resin, gold alloy, silver amalgam

C

Which of the following is the most concentrated type of fluoride on the market? A: Stannous fluoride (SnF) B: Acidulated phosphate fluoride (APF) C: Fluoride varnish D: Sodium fluoride (NaF)

C

Which of the following is true of the bonding process? A: it can be performed on only the dentin B: contamination will not hinder the bond C: avoid overdrying or desiccating the tooth; the product works best on slightly moist tooth structure D: using a small amount of bonding material is better than using too mcuh

C

Which type of the following types of composite resins is most often used today? A: microfilled B: flowable C: hybrid D: macrofilled

C

You are asked to select a protective base for insulation that is nonirritating under a composite restoration. Which would you select? A: zinc oxide-eugenol B: zinc phosphate C: polycarboxylate D: glass ionomer

C

________ is the process by which the resin material is changed from a pliable state into a hardened restoration. A: Tituration B: Retention C: Polymerization D: Galvanism

C

A porcelain casting is chosen over metal castings because of each of the following except that it: A: can improve the esthetic appearance of anterior teeth B: has the ability to match the color of the natural tooth structure C: is a good insulator D: has a high thermal coefficient of expansion

D

An example of a biological pulpal stimulus is A: changes form hot and cold coming into contact with the tooth B: traumatic occlusion, which occurs when a person's "bite" does not occlude properly C: acidic materials reaching pulpal tissues D: bacteria form saliva coming into contact with pulpal tissues

D

Bonding agents or adhesives: A: can be light-cured B: must be used after etching C: are available as self-cured D: are all of the above

D

Criteria for new restorative materials states that the material must be A: able to protect the tooth and tissues of the oral cavity B: easily formed and placed restoring comfort, function, and contour C: not capable of irritating tissues or being poisonous D: all of the above

D

Desensitizer should be placed: A: after throughly drying the tooth B: on enamel only C: and dried immediately D: after rinsing and lightly drying the tooth

D

Glass ionomer can be used for Class _________ restorations. A: II B: III C: IV D: V

D

In most states, expanded-function dental assistant duties include A: placing IRM B: using a high speed handpiece for cavity preperation C: applying a provisional restoration D: doing both A and C

D

Materials used to restore posterior teeth must be capable of withstanding _________ psi. A: 10,000 B: 15,000 C: 18,000 D: 28,000

D

One difference in the cavity preparation of amalgam versus composite is that: A: more retention is cut into the prep for composite B: amalgam requires the use of a bonding system C: composites are more compatible with most dental materials used for bases D: composites require the use of a bonding system

D

Patients may feel sensitivity after the placement of a restoration: A: immediately B: after a month C: for several months D: at any time

D

Single-spill capsules A: contain 600 mg of alloy B: are used for small restorations C: should be discarded immediately after use D: all of the above are correct

D

The resin matrix component of composite is dimethacrylate, a fluid-like material also referred to as A. quartz. B. silica. C. IRM. D. BIS-GMA.

D

The restorative material indicated for use when decay has extended into or close to the pulp is: A: liner/varnish B: base/ desensitizer C: bonding agent D: any of the above

D

The term restorative describes the ability to A: remove disease B: restore function C: be esthetic D: remove disease and restore function

D

The type of ceramic most often used in dentistry for casting is A: composite resin B: glass ionomer C: zinc oxide-eugenol cement D: porcelain

D

Types of pulpal stimuli can be A: physical B: mechanical C: chemical or biologic D: all of the above

D

Varnish should be placed on the ________ of the preparation. A: walls B: floor C: margins D: all of the above are correct

D

When composite resin cement is used, how should the tooth surface be prepared? A: free of all plaque and debris B: etched or treated with a bonding system C: sprayed with water before cementation D: both A and B

D

Which type of cement id preferred for cementation of ceramic veneers? A: zinc phosphate B: polycarboxylate C: glass ionomer D: composite resin

D