CFU quizzes

After condensation of the final increment of amalgam in to a CL II cavity preparation, how full should the cavity preparation be?

1 mm higher than the cavosurface margin

Ideally, amalgam restorations should be finished and polished after:

24 hours

The primary reason for polishing an amalgam restoration is to: (National Board Question)

reduce surface irregularities

Ideally, composite restorations should be finished and polished when?

At the end of the appointment after placing and shaping the composite

T/F Corrosion is discoloration that can proceed to tarnish and is a chemical process in which a thin layer of chromium oxide is produced.

Both statements are false.

T/F During amalgam finishing and polishing, coarser abrasives should be followed by finer abrasives. This allows for larger scratches in amalgam surface to be reduced to less defined scratches.

Both statements are true

An amalgam restoration located on the gingival third of tooth #3 would be a Class _____ restoration.

CL V

Theracal contains _____________________ which protects the pulp and decreases post-op sensitivity.

Calcium silicate

used to check the cavosurface margins for ditching and flashing

Explorer

The composite restoration on tooth # 9 exhibits what problem?

Flash

What are characteristics of Vitrebond?

Glass ionomer Releases fluoride Chemically bonds with the tooth structure

Tooth #8 has been prepared to receive a Class III composite. Which of the following intermediary materials are contraindicated for use?

IRM (ZOE) (Interferes with polymerization of composite) Copalite (Varnish) (Not used with composite because it softens the resin and monomers in resin may dissolve varnish.)

adapts best to complete overfill layer of amalgam at occlusal cavosurface margin

Larger condenser

What is the recommended order of placement of the intermediary materials when restoring a subpupal composite restoration?

MicroPrime, vitrebond, optibond, flowable, composite

You have just finished triturating your amalgam and notice that it is "shiny, hot, and dry". It is difficult to condense and sets fast. The amalgam was most likely ...

Over triturated

Which are indicators for using intermediary materials?

Protect the pulp Aid in recovery of the pulp Minimize secondary caries

used to adapt the first incremental layer of amalgam in the proximal area

Smaller condenser

used for carving anatomy (smooth and shape ridges)

T-3 carver (1/2 half-hollenbach) Discoid-cleoid carver

used to redefine grooves

T-3 carver (1/2 half-hollenbach) Discoid-cleoid carver

T/F MicroPrime is vigorously brushed on all internal walls for 5 seconds. It contains antimicrobial and desensitizing agents.

The first statement is false. The second statement is true.

T/F to assist in identifying overhangs, x-rays are utilized. All overhangs can be re-contoured to achieve functional anatomy.

The first statement is true; the second statement is false

This drawing depicts what type of contour for an anterior composite on the mesial of #9?

Undercontoured

Care and maintenance of anterior composite restorations include the following

Using neutral fluoride or fluoride varnish, Using an aluminum oxide polishing paste such as Prisma Gloss

Which of the following cements, when mixed, exhibits an exothermic reaction (heat)?

Zinc Phosphate

Factors to consider when checking the matrix and wedge prior to composite placement ... (Mark all that apply) a. Proper contact is maintained b. Wedge does not impinge on the gingival box c. Wedge seals gingival margin d. Proximal contour is correct e. Wedge does not impinge on the axial wall

a, b, c, d

Which of the following is not a purpose of placing a wedge? a.It stabilizes the Tofflemire retainer. b.It separates the teeth to compensate for the thickness of the band. c.It helps prevent overhangs. d. It provides a tight seal for the cavity prep at the gingival margin.

a.It stabilizes the Tofflemire retainer.

If you wanted to change the diameter of a matrix band which was positioned in the Tofflemire retainer, you would adjust the

adjusting nut

Dental bleaching products __________________________ the bond strength of composites.

adversely affect

Criteria for an acceptable amalgam restoration for polishing is a. the anatomy can be maintained or improved b. margins can be improved so they are flush with the adjacent cavosurface margins c. contact is present in a class II restoration d. no fractures

all of the above

most accurate definition for the term amalgam

an alloy of two or more metal, one of which is mercury

You are exploring Miss Iva Pane's #2 MO amalgam restoration and notice that excess amalgam has been left on the cavosurface margin. The explorer will

catch (jump) moving from tooth to amalgam

Finishing and polishing composite restorations improves all of the following EXCEPT: a. Gingival health b. Excessive corrosion c. Surface luster d. Marginal flash

b. Excessive corrosion Composite are not subject to corrosion because they are not made of metal like amalgam (silver) restorations.

Which of the following materials is used for retention between the tooth structure and a composite restoration?

bonding agent

T/F Calcium hydroxide should be mixed within 10 seconds. When properly mixed, it should be uniform in color.

both are true

_________________ is used as a low-strength base or liner, and is slightly irritating, which stimulates secondary dentin formation.

calcium hydroxide

Which clinical findings can be associated with overhangs?

erythema, bleeding on probing, increased probe readings

After placing the wedge, you check the seal between the band and the tooth at the gingival cavosurface margin of the preparation. There is a gap (opening) at the gingival cavosurface margin. How can this error be corrected?

check the band and tighten if necessary, use a larger wedge

What restorative material is contraindicated for the use of Hirshfield files?

composite

Amalgam is strongest in __________________ strength after it has set.

comprehensive

When preparing the matrix band for a CL II preparation, contouring the band is essential for the final restorations

contact and embrasure contour

What is found in dental Amalgam?

copper, tin, silver, zinc

All of the following could be uses of dental cements/bases EXCEPT one: a. Permanent luting b. High-strength base c. Temporary filling d. Permanent Restoration

d. Permanent Restoration

Only light pressure should be used to apply coarse abrasive material during amalgam polishing because heavy pressure causes: (National Board Question)

deep grooves

Copalite is used in conjunction with amalgam restorations for which of the following reasons ...

reduces microleakage from the amalgam

The reason high copper amalgam is stronger is because it

eliminates the gamma 2 phase (Sn-Hg) which is the weakest phase.

Use the diagram below to identify the edge of the matrix band labeled by the letter "B"

gingival

Identify the proper PPE (personal protective equipment) required to prevent mercury contamination.

gloves, mask, lab coat, eye wear, shoes with covered toes

Using the diagram below, identify what part of the Tofflemire retainer is labeled by "B"?

guide channels

Polishing amalgam reduces the likelihood that tarnish and corrosion will occur because it:

helps to create a smooth, homogeneous surface that resists tarnish and corrosion.

Finishing burs are more abrasive than: (mark all that apply): a. tin oxide b.cutting burs c. brown polishing point d. hi sh point polishing (green one with yellow band)

hi sh point polishing (green one with yellow band), brown polishing point, tin oxide

Selecting the shade for a class III restoration should be done

in consultation with the patient., prior to placement of the dam.

Miss Iva Pane comes to your office for a dental appointment to restore tooth #2 MO. Which cavosurface margin or area on #2 MO should be carved first after the removal of the band?

interproximal gingival margin

Finishing strips are used primarily to polish:

interproximally below the contact

Should more pressure be used when using a smaller condenser, or larger condenser?

larger condenser

Which one of the following best indicates the function of the small nut on the end of the Tofflemire retainer?

locks band in retainer

The most effective method to prevent overheating of the pulp when polishing a composite is to

maintain a moist tooth and composite.

A Tofflemire matrix prepared for tooth #28 can also be used on teeth in which quadrant?

maxillary left

One should begin condensation of amalgam in a CL II MO preparation in the

mesial proximal

Which of the following describes a luting cement that has reached the correct consistency?

mix will be creamy and stretch between the spatula and the mixing pad

A finishing bur differs from a cutting bur in that a finishing bur has:

more blades

Using the diagram below identify the edge of the band indicated by the letter "A"

occlusal

If a matrix band is not contoured and a contact point is not established, what are the consequences?

open contact

To clean up a small mercury spill in the ISU dental lab, you would ...

place mercury in scrap amalgam container

Finishing differs from polishing in that finishing

produces the finals shape and contour.

When using files to remove a Cl II overhang, what type of strokes are used?

pull stroke, short and controlled stoke, shaving stroke

When removing a Tofflemire matrix band and wedge from a #19 MO amalgam restoration, you should

remove the retainer, then the band from the distal side first followed by the mesial side in an occlusal-lingual or occlusal-buccal direction

The surface appearance of an amalgam restoration following completion of a thorough polishing sequence may best be described by which of the following phrases?

shiny, mirror-like finish

Select the item that is NOT contraindicated for a margination procedure: a. recurrent decay b. sub-marginal excess of restorative material (Type I or Type II overhang) c. un-improveable contacts d. fractured restoration e. deficient margins (ditch or open margin)

sub-marginal excess of restorative material (Type I or Type II overhang)

Miss Iva Pane has just finished her dental appointment where an amalgam restoration was placed on #2 MO. You remind her not to bite on her amalgam restoration for 4 to 8 hours after placement because:

the compressive strength of the amalgam is low

After finishing your amalgam restoration on restorative patient, you instruct the patient not to chew or bite on the amalgam restoration for 4 to 8 hours after insertion because ...

the compressive strength of the amalgam is low (has not reached its final set)

Delayed expansion of amalgam restorations is associated with ...

the contamination of the amalgam by moisture during trituration and/or condensation

Control of the mercury content during the mixing and condensing of amalgam must be carefully considered because ...

the lower the mercury content, the higher the strength and the lower the marginal breakdown

Control of the mercury content during mixing and condensing of amalgam must be carefully considered because:

the lower the mercury content, the higher the strength and the lower the marginal breakdown.

A patient presents with a type II amalgam overhang. Which of the following statements are relevant to these types of overhangs?

they would be visible radiographically, they would be detected by an explorer

The purpose of using condensers when compressing amalgam into restorations is

to eliminate voids in the amalgam restoration to reduce the amount of residual mercury to increase the strength of the restoration to provide good adaptation of the amalgam to the cavity walls

Which of the following method(s) prevent(s) the escape of mercury vapor when mixing amalgam?

triturating premeasured capsules containing powder and mercury, placing a cover over the mixing arms of the triturator

Proper sequence when placing an amalgam restoration

trituration, condensation, carving

When a matrix band is drawn too tightly and the band is flattened in the proximal area, what will result?

undercontoured embrasure, open contact

Which of the following are likely to produce excessive heat during polishing? a.using a dry agent at high speeds b.increasing speed without decreasing pressure c.using low speeds and too much polishing paste d. using too much paste with little saliva

using a dry agent at high speeds, increasing speed without decreasing pressure

When exploring a tooth, how can you tell if an overhang is present?

when going from tooth to restoration in the interproximal the explorer will catch

Condensation on Miss Iva Pane's CL II #2 MO amalgam restoration should be performed with what?

with firm pressure so the mercury will rise to the surface, with the smaller end of the condenser followed by the larger end