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Dental Materials Chapt. 5&6 Test
Terms in this set (82)
Which component of dental amalgam exists as a liquid in the capsule before trituration?
A freshly mixed mass of amalgam has a puttylike consistency for ____ minutes
1 to 2
Which of the following is not an advantage of dental amalgam when contrasted with direct resin composite?
High copper amalgam has about ____ wt % copper
30 to 40
High-copper amalgams have ____- than low-copper amalgams
More corrosion and higher strength
Which component of earlier low-copper amalgam caused a significant, unacceptable expansion of amalgam when it was contaminated with moisture during placement?
An admixed dental amalgam contains _____ shaped alloy powder particles
A mixture of irregularly shaped and spherically
Which of the following statements is true of admixed amalgam in contrast with spherical amalgam? Admixed amalgams
Require more condensation force than spherical amalgams
Which of the following elements is a liquid at room temperature?
Which of the following delivery methods for silver amalgam exposes the staff to the least amount of mercury?
Silver alloy powder and mercury sealed into a disposable hard plastic capsule
Elimination of which compound in the gamma-2 phase of amalgam setting increases clinical longevity in todays high-copper amalgam restorations?
In the set mass of amalgam, original silver alloy particles comprise over ____ % of the volume
_____ mercury vapor is released from dental amalgam per day, as a result of chewing
1 to 2
Which phase is absent in a high-copper amalgam?
Y2 (Gamma 2)
In its reacted state, little mercury is released from an amalgam. Little free mercury is available to be released from a set amalgam
Both statements are correct
What would insufficient strength in a dental amalgam lead to?
Which of the following statement(s) is (are) true of the property of creep for amalgam restorations?
It is associated with the breakdown of marginal integrity.
The ANSI/ADA required that creep be less than 3%
What is tarnish?
A surface phenomenon
What is the correct order for the manipulation of amalgam?
Mixing, condensation, carving, and finishing
How will under-triturated amalgam appear?
Dull and crumbly
Why are ultrasonic condensers discouraged for condensation of amalgam?
Increase the evaporation of mercury from the setting amalgam
Which of the following is the most likely route of entry for mercury into the patient and dental personnel during the manipulation of amalgam?
The lungs as a vapor
How should amalgam scrap be handled?
Stored in a sealed container containing x-ray fixer or another reducing agent.
The maximum permittable mercury vapor level established by OSHA is ____ mg/m per 40-hour week
When should high-volume evacuation be used with dental amalgam?
Placing, Polishing, and removing
Which of the following statements is correct regarding todays dental amalgam?
It has high longevity
At 1 day after placement, amalgam's tensile strength most closely resembles which human structure?
On average, how much copper is in today's dental alloy?
Which of the following is incorrect regarding admixed alloy?
It is a mixture of particles
Which of the following is incorrect regarding spherical alloy?
It is easy to condense
Mercury is liquid at room temperature. It is one of two liquid metallic elements on the periodic table.
Statement 1 is correct; statement 2 is incorrect.
Which of the following is a correct assessment regarding mercury vapor in amalgam?
Higher release may occur during the setting reaction, during removal of old amalgams, and if the amalgam is heated above 80 degrees C.
The sum of ______ determines the overall dimensional change of an amalgam restoration.
Contraction and expansion during setting.
How will the mixture appear if amalgam is over-triturated?
Wet, soupy mix.
Which of the following are characteristics of under-triturated amalgam?
Will appear dry and crumbly.
Amalgam should be placed in the cavity preparation by _____ increments.
Small to large
What is the purpose of over-packing the preparation with amalgam?
Adequate contour, correct occlusion, closed margins
Why is it important to use water when polishing an amalgam restoration?
So the tooth won't overheat.
Which of the following is a component of good mercury hygiene?
Using premixed, sealed capsules.
Which component added to silver alloy causes amalgam to expand if contaminated by saliva?
Of the following, which is an advantage of using spherical amalgam particles?
Uses less mercury
Why are finishing and polishing techniques so important in restorative dentistry?
Remove excess material and to smooth roughened surfaces
Which types of materials are used for finishing and polishing?
For an abrasive, the higher the speed, the greater the frequency per unit of time the particle contacts the surface. In a clinical situation it is easiest to control pressure rather than speed to vary the rate of abrasion.
Statement is incorrect; statement 2 is correct
Which types of abrasives are generally hard, coarse abrasives used primarily for the development of desired contours of a restoration or tooth preparation and for the removal of gross irregularities on a surface?
Which abrasive disks are beige?
Sand disks should not be used interchangeably with ___ disks?
Which of the following abrasive agents commonly used in dentistry for polishing and cleansing is derived from diatoms?
Which of the following statements is true when using abrasives?
The area being finished and polished should be rinsed with each successive change of abrasive.
Dry polishing will increase the danger of overheating the surface.
Which of the following would represent an appropriate sequence for finishing and polishing an amalgam restoration?
Green stone, finishing bur, silex, tin oxide
Some fast-setting, high-copper amalgams can be polished about 8 to 12 minutes after placement with a ____paste of extra-fine ____ and water in a rubber cup.
Which technique will produce the smoothest surface on a composite restoration?
Curing against a polyester matrix
Which technique will produce the smoothest surface of a gold casting?
Crocus disk with rouge
Which of the following represents an appropriate sequence for finishing and polishing an acrylic denture base?
Finishing bur, pumice slurry, Tripoli
After polishing, a denture should be stored ____ until delivery to the patient.
Which of the following procedures are recommended in order to maintain infection control when using pumice to polish acrylic denture base material?
Change pumice daily.
Use a separate pumice pan for each patient.
Mix pumice with a liquid disinfectant such as 5 parts sodium hypochlorite to 100 parts distilled water
Which of the following types of abrasive materials found in prophy paste, wear during use but continue to abrade, producing an increasingly smoother surface?
Which of the following restorative materials is most subject to wear during a prophylactic procedure?
Which of the following materials is the most difficult to remove from a tooth surface during tooth prophylaxis?
What is the purpose of a humectant in toothpaste?
Which of the following is not one of the criteria for an ideal denture cleanser?
Be able to remineralize worn acrylic denture teeth.
Which of the following choices represent(s) an effective means of improving denture cleanliness?
Chemical cleansers and brushing
Which of the following techniques are recommended for cleaning dentures and prosthetic appliances fabricated from base metals such as cobalt-chromium alloy?
Which of the following methods would not be used to clean a demure with a soft liner?
An organic solvent such as chloroform
Home bleaching agents typically contain 10% to 22% ______ peroxide.
Which of the following statements is true of bleaching agents?
Some microhybrid composites, hybrid ionomers, and glass ionomers have been roughened slightly by bleaching gels.
Which factor affects the rate of abrasion?
Rate of speed
When using an abrasive material how will the amount of pressure exerted affect the outcome?
Cause deeper grooves in the finished restoration.
Which statement is true regarding the smooth surface of a restoration?
Allows stain formation
What are the three categories of abrasives used in dentistry?
Finishing, polishing, and cleansing
What is the purpose of using glycerin with polishing agents?
Which of the following is true about diamond stones?
Chips added to a binder.
Formed into disks, cups, or points.
When are fine abrasives used?
At what point can high-copper amalgams be polished?
Can be polished after 8 to 12 minutes.
Which statement is correct about the finish on a glass ionomer restoration?
Rougher than a compomer
Which of the following is true about rag wheels and pumice?
Disposed of after each patient use.
Used on the tongue side of the prosthetic.
Dentrifice Products that contain pumice and quartz show lower cleansing values. Dentrifice products that contain pumice and quartz show lower abrasion to tooth surfaces
Both statements are incorrect.
Which of the following cleaning techniques would be most effective for cleaning stain and plaque from dentures?
Using a denture brush and denture paste.
What are the side effects of tooth whitening products?
Sloughing of the gingiva.
Which of the following is not part of the guidelines for in-office bleaching?
Patients can be processing while the dental team is seeing other patients.
The patient may need local anesthetic for sensitivity.
Which of the following is not a recommended type of denture cleaner?
Whitening agents are effective in removing which types of stain or discoloration?
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