Deck 51: Provisional Coverage

Question 1

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

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

Answer 1

even with

Question 2

The purpose of provisional coverage is to:

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.

Answer 2

maintain function to the area of the mouth.

Question 3

Prefabricated temporary crowns:

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

Answer 3

made of polycarbonate are used where appearance is important.

Question 4

The provisional should _____ below the margin of the preparation.

A)not extend
B)extend one to three mm
C)extend four to six mm
D)extend six to eight mm

Question 5

Advantages of using pre-formed crowns for provisional coverage include:

A)reduces time required for the procedure.
B)the pre-formed shell comes with anatomic features of natural teeth.
C)the monomer setting time is less than 90 seconds.
D)both a and b.

Question 6

Patient home-care instructions for someone with provisional coverage should instruct him to:

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 7

Laboratory-fabricated coverage would be used when:

A)the 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 8

Stainless steel crowns are:

A)used in cases where strength is essential.
B)commonly used for the primary teeth.
C)custom fabricated.
D)both a and b.

Question 9

One of the two most common materials used for custom provisional coverage is:

A)self-curing acrylic resin.
B)light-cured composite resin.
C)polycarbonate shells.
D)alginate.

Question 10

The most common type of provisional coverage used for crown and bridge preparations is:

A)the pre-formed polymer crown.
B)custom-made.
C)the aluminum crown.
D)the polycarbonate crown.

Question 11

The two types of provisional coverage include _____ and _____.

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

Question 12

Provisional crowns are commonly cemented with _____ cement.

A)temporary
B)polycarboxylate
C)glass ionomer
D)composite resin

Question 13

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 14

The final step after cementing the provisional coverage is:

A)removing the gingival retraction cord.
B)taking a periapical radiograph.
C)checking the occlusion.
D)polishing the provisional.

Question 15

When using a thermoplastic tray to fabricate a custom provisional,the tray is 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.

Question 16

A disadvantage of using custom provisional coverage is that is:

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

Question 17

Which statement is NOT true of 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.

Question 18

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 19

_____ crowns are pre-formed crowns used for provisional coverage on anterior teeth,when appearance is important.

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

Question 20

The provisional that used a polymer shell filled with a hybrid composite resin that bonds with the pre-formed crown and tooth is a ____ crown.

A)stainless steel
B)custom provisional
C)polycarbonate
D)pre-formed polymer

Question 21

Pre-formed polycarbonate crowns:

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

Question 22

When using a pre-formed provisional crown,the crown is tried on for shape and size _____ the tooth is prepared.

A)after
B)during the time
C)before
D)none of the above; the pre-formed crown is tried on at an appointment that occurs before the crown preparation appointment.

Question 23

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

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

Question 24

When fabricating a provisional,undercuts on the proximal surfaces of adjacent teeth can cause _____ the provisional.

A)inadequate margins on
B)locking on of
C)occlusal voids on
D)distortion of

Question 25

The usual set time for the mixed acrylic before placement into the mouth is:

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

Question 26

If the liquid/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 27

Indications for provisional coverage include:

A)maintaining the function of the prepared tooth.
B)preventing shifting of opposing teeth.
C)keeping the patient comfortable while the prosthesis is being made.
D)all of the above.

Question 28

Home care instructions for a patient with provisional coverage include:

A)to avoid chewing on the provisional.
B)to brush carefully, avoid flossing as that may pop the provisional off.
C)if the provisional should come off, contact the office immediately so it can be put back on.
D)no special home care instructions are required.

Question 29

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 30

The setting time for the resin placed in a pre-formed crown is approximately ___ seconds.

A)20 to 30
B)30 to 40
C)60
D)90

Question 31

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

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

Question 32

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 33

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