Deck 51: Provisional Coverage

Question 1

When is a thermoplastic tray,used to fabricate a custom provisional,made?

A)Before the dentist prepares the teeth
B)After the dentist prepares the teeth
C)Anytime during the preparation appointment
D)After the final impression is made

Answer 1

Before the dentist prepares the teeth

Question 2

Which statement is incorrect about prefabricated crowns?

A)The crowns are supplied in many types of materials, depending on the location of the provisional.
B)Prefabricated crowns can be used for posterior and anterior preparations.
C)The crowns are available for bridges as well as for single units.
D)Prefabricated crowns can be shaped to match adjacent teeth.

Answer 2

The crowns are available for bridges as well as for single units.

Question 3

Which provisional uses a polymer shell filled with a hybrid composite resin that bonds with the preformed crown and tooth?

A)Stainless steel
B)Custom provisional
C)Polycarbonate
D)Preformed polymer

Answer 3

Preformed polymer

Question 4

Which cement is most commonly used with provisional crowns?

A)Temporary
B)Polycarboxylate
C)Glass ionomer
D)Composite resin

Question 5

What is the advantage of using preformed crowns for provisional coverage?

A)It reduces time required for the procedure.
B)Preformed shells comes with anatomic features of natural teeth.
C)Monomer setting time is less than 90 seconds.
D)Both a and b are advantages.

Question 6

The cervical margins of the provisional should have no more than ___ mm of space between the crown margin and the finish line of the preparation.

A)1.0
B)0.1
C)0.5
D)0.10

Question 7

Of the materials listed,which one is used most commonly for custom provisional coverage?

A)Self-curing acrylic resin
B)Light-cured composite resin
C)Polycarbonate shells
D)Alginate

Question 8

How far below the margin of the preparation should the provisional crown sit?

A)The provisional should be flush with the margin.
B)Extend one mm below the margin.
C)Extend 2 mm below the margin.
D)Sit 1 mm above the margin.

Question 9

Which procedure would require a patient to wear a provisional prosthesis for a longer period of time?

A)Porcelain veneers
B)Implants or periodontal therapy
C)Full gold cast crowns
D)Porcelain jacket crowns

Question 10

What is the most common type of provisional coverage used for crown and bridge preparations?

A)Preformed polymer crown
B)Custom-made
C)Aluminum crown
D)Polycarbonate crown

Question 11

The two types of provisional coverage include _____ and _____.

A)direct; indirect
B)functional; esthetical
C)custom; prefabricated
D)polymer; monomer

Question 12

Which provisional,preformed crowns are used on anterior teeth,when appearance is important?

A)Aluminum
B)Polycarbonate
C)Stainless steel
D)Nickel-chromium

Question 13

What is the final step after cementing the provisional crown?

A)Remove the gingival retraction cord.
B)Take a periapical radiograph.
C)Check the occlusion.
D)Polish the provisional.

Question 14

What is the purpose of provisional coverage?

A)Restore function to the area of the mouth.
B)Keep the patient comfortable.
C)Maintain function to the area of the mouth.
D)All of the above are correct.

Question 15

When would a stainless steel crown be used for provisional coverage?

A)When strength is essential
B)Commonly for the primary teeth.
C)For custom fabrication
D)Both a and b

Question 16

When is laboratory-fabricated coverage used?

A)Size and shape of the teeth would indicate the need for it.
B)Several teeth have been prepared, such as in a multiunit bridge.
C)The patient wants a custom made provisional.
D)A patient has an allergy to the acrylic.

Question 17

What is one disadvantage of using custom provisional coverage?

A)It can only be used for anterior teeth.
B)It can be the most time-consuming to make.
C)It is hard to fit the prepared tooth.
D)It does not look natural.

Question 18

Which of the following is appropriate patient home-care instruction for someone with provisional coverage?

A)"Pop" the floss out of the contact.
B)Pull floss through the contact, either to the facial or lingual side, once floss is placed below the contact.
C)Have the provisional coverage recemented or replaced if it becomes loose or is lost.
D)Leave the provisional coverage out of the mouth until the final restoration is cemented if it becomes loose or is lost.

Question 19

Which statement is correct regarding prefabricated temporary crowns?

A)They can be used for posterior but not anterior preparations.
B)They are available in cast gold.
C)They are available in porcelain fused-to-metal.
D)Crowns made of polycarbonate are used where appearance is important.

Question 20

The occlusal surface of the provisional coverage should sit _____ the occlusal plane of the adjacent teeth.

A)below (infraocclusion)
B)even with
C)above (supraocclusion)
D)even with or above

Question 21

If the liquid or powder acrylic material is being used for the provisional,how many drops of liquid are used?

A)5
B)10
C)12
D)Enough to wet the powder

Question 22

Which statement is correct regarding preformed polycarbonate crowns?

A)They are stock crowns and come in a limited selection of size, shape, and shades.
B)They are thin and not esthetically pleasing.
C)They can be used as a mold to fabricate a custom provisional.
D)Both a and c are correct statements.

Question 23

What is the set time for mixed acrylic before placing it into the mouth?

A)20 to 30 seconds
B)1 to 2 minutes
C)2 to 3 minutes
D)4 to 5 minutes

Question 24

Why is the provisional placed on the tooth in the patient's mouth for the final curing stage?

A)To ensure the color and shape of the provisional match the tooth
B)To ensure the provisional is in correct occlusion
C)To avoid excess shrinkage of the provisional during the final curing stage
D)To check the margins for accuracy before curing

Question 25

The provisional is trimmed to within ___ mm of the gingival shoulder of the prepared tooth.

A)1
B)2
C)3
D)4

Question 26

Why is it necessary to keep the preliminary alginate impression moist?

A)To reduce the chance of cross-contamination
B)To aid in the setting time of the acrylic being used
C)To make it easier to remove the acrylic after it is set
D)To keep the alginate from distorting

Question 27

What could occur when fabricating a provisional if undercuts are present on proximal surfaces?

A)Inadequate margins
B)Locking on
C)Occlusal voids
D)Distortion

Question 28

What should be done if the margins of the provisional are not adequate?

A)Throw it away and start over.
B)Additional material is added at the inner aspect of the margin and then the provisional is reseated for setting.
C)Because it is a temporary crown, the margins are not critical.
D)Remove the material from the gingival embrasure space with a Hollenback instrument.

Question 29

Once the acrylic-loaded impression is on the prepared tooth,it should remain on the tooth for approximately how long?

A)1 to 2 minutes
B)3 minutes
C)90 seconds
D)4 to 5 minutes

Question 30

During a crown preparation appointment,when are preformed provisional crowns tried in for size and shape?

A)After
B)During
C)Before
D)None of the above

Question 31

Which statement is a contraindication for provisional coverage?

A)Maintain the function of the prepared tooth.
B)Prevent shifting of opposing teeth.
C)Keep the patient comfortable while the prosthesis is being made.
D)Cover the facial of a veneer preparation.

Question 32

What instructions are given regarding home care instructions for a patient with provisional coverage?

A)Avoid chewing on the provisional.
B)Brush carefully and avoid flossing, because it could pop the provisional off.
C)If the provisional comes off, contact the office immediately so it can be put back on.
D)No special home care instructions are required.

Question 33

What is the setting time for the resin placed in a preformed crown?

A)20 to 29 seconds
B)30 to 59 seconds
C)60 to 89 seconds
D)90 to 120 seconds