Deck 17: Provisional Restorations

Question 1

Which of the following is the primary disadvantage of the use of acrylic provisional materials?

A) Poor esthetics
B) Difficult manipulation
C) High cost
D) High shrinkage

Answer 1

High shrinkage

Question 2

Which of the following would not be a necessary function of a posterior provisional restoration?

A) Maintaining occlusion
B) Reduced sensitivity
C) Esthetics
D) Eliminating migration

Answer 2

Esthetics

Question 3

Zinc oxide provisionals should not be used if a permanent restoration is to be cemented with a __________ luting agent.

A) resin
B) zinc polycarboxylate
C) glass ionomer
D) zinc phosphate

Answer 3

resin

Question 4

Pre-formed celluloid forms and polymer crowns are filled with:

A) zinc oxide eugenol cement
B) acrylic resins or composites
C) gutta percha
D) resin cement

Question 5

If a provisional crown comes off during a time that the dental office is closed, the patient can be instructed to replace it after cleaning the interior of the crown and placing a small amount of _________ into the crown.

A) cyanoacrylate (super glue)
B) liquid nails cement
C) chewing gum
D) denture adhesive

Question 6

Why are one or two small holes usually placed in the occlusal portion of the pre-formed celluloid or polymer crown form?

A) To establish occlusion with the opposing dentition
B) To allow excess resin or composite material to flow out when the crown form is seated
C) To create a proximal contact with the adjacent tooth
D) To capture the occlusal contour of the opposing dentition

Question 7

A prepared tooth without occlusal/incisal and proximal contact may migrate laterally or occlusally/incisally within as soon as a few:

A) days
B) weeks
C) months
D) years

Question 8

Home care instructions for a patient with a provisional restoration include:

A) do not brush or floss the restoration
B) brush but do not floss the restoration
C) brush and floss the restoration, but remove the floss by pulling it out to the side under the contact rather than back in an occlusal/incisal direction
D) brush and floss the restoration as you would any other tooth

Question 9

Which of the following is true of the direct technique for provisional coverage?

A) An impression of the area is made and poured in stone; the template is then made on this model.
B) The provisional is fabricated on a model and then relined before it is placed on the preparation.
C) A template of the tooth before preparation is obtained using wax or an impression material directly in the mouth.
D) The direct technique allows for superior access and enhances the time and convenience of making multi-unit bridges or crowns in difficult to access areas.

Question 10

If the surfaces of a provisional restoration are ______________, the process of chewing will excessively force food directly into the gingiva. An ___________ restoration may trap plaque by not allowing for any self-cleansing or gingival stimulation from the chewing process.

A) overcontoured; overcontoured
B) overcontoured; undercontoured
C) undercontoured; overcontoured
D) undercontoured; undercontoured

Question 11

Which of the following is the most common choice of matrix or template material for multi-unit and indirect provisional techniques?

A) Thermoplastic wax
B) Silicone impression materials
C) Alginate
D) Vacuum-formed plastic

Question 12

___________ generated during the polymerization of chemical-cured acrylic can potentially damage the pulp or burn soft tissues.

A) Heat
B) Off-gassing
C) Chemical by-products
D) Hydroquinone

Question 13

Which of the following is true of pre-formed polycarbonate provisional crowns?

A) Unlike their metal partners, they do not come in several sizes and shapes.
B) Like metal, they are flexible and may be crimped with contouring pliers.
C) The primary advantage is their esthetics for replacement of anterior teeth.
D) They are incompatible with acrylic resins.

Question 14

Which of the following is the most durable of the pre-formed crowns?

A) Polycarbonate crown
B) Stainless steel crown
C) Aluminum shell crown
D) Celluloid crown form lined with acrylic or composite materials

Question 15

If the provisional restoration itself is too high, the results may be those associated with:

A) lateral migration of the prepared tooth
B) trauma from occlusion
C) gingival irritation from food impaction
D) occlusal drifting of the prepared tooth

Question 16

Which of the following is true concerning patient education for provisional coverage?

A) Provisional coverage provides the same results as permanent coverage.
B) No increase in temperature sensitivity is associated with the provisional material.
C) The patient need not call the office if the provisional is dislodged or lost.
D) Limitations in esthetics may include imperfections in color matching, anatomic contour, and smoothness.

Question 17

Which of the following provisional materials is limited to intracoronal placement?

A) Provisional cement
B) Provisional acrylic
C) Provisional composite
D) Provisional polycarbonate crown

Question 18

Care must be taken in the fabrication of provisionals by utilizing acrylic materials to "pump" them on and off the preparation after initial polymerization to:

A) accelerate the set of the material
B) seal off the exposed dentinal tubules on the tooth
C) prevent them from locking on the tooth
D) open proximal contacts

Question 19

Cement provisionals are most frequently fabricated with:

A) zinc polycarboxylate
B) zinc oxide eugenol
C) zinc phosphate
D) calcium hydroxide

Question 20

A/An ___________________ provisional crown is crimped and contoured at the contact and margins with crimping and contouring pliers.

A) polycarbonate
B) celluloid crown form lined with composite
C) aluminum shell
D) stainless steel

Question 21

Irritation, inflammation, and recession of the gingiva, associated with a provisional restoration, is caused by:

A) issues with contour
B) poor marginal coverage
C) chewing hard foods
D) brushing and flossing the provisional

Question 22

The most common use of a stainless steel crown would be on a:

A) crown prep on an adult molar
B) crown prep on a primary molar
C) crown prep on an anterior tooth
D) bridge prep in the adult posterior teeth

Question 23

Match the items with the correct description below.
Direct fabrication

A)The continuous margin that borders the preparation to which the restoration is fit or finished
B)A restoration that covers all or part of the external surface of the tooth and may extend over the cusp tips on facial or lingual surfaces or include the removal of cusps
C)Provisional restoration made on a cast outside the patient's mouth
D)A restoration within the crown of the tooth, such as an inlay
E)Provisional restorations made directly inside the patient's mouth

Question 24

Match the items with the correct description below.
Extracoronal restoration

A)The continuous margin that borders the preparation to which the restoration is fit or finished
B)A restoration that covers all or part of the external surface of the tooth and may extend over the cusp tips on facial or lingual surfaces or include the removal of cusps
C)Provisional restoration made on a cast outside the patient's mouth
D)A restoration within the crown of the tooth, such as an inlay
E)Provisional restorations made directly inside the patient's mouth

Question 25

Match the items with the correct description below.
Finish line

A)The continuous margin that borders the preparation to which the restoration is fit or finished
B)A restoration that covers all or part of the external surface of the tooth and may extend over the cusp tips on facial or lingual surfaces or include the removal of cusps
C)Provisional restoration made on a cast outside the patient's mouth
D)A restoration within the crown of the tooth, such as an inlay
E)Provisional restorations made directly inside the patient's mouth

Question 26

List and describe the four criteria for provisional coverage.

Question 27

An example of a procedure requiring an intracoronal provisional restoration would be:

A) crown prep
B) bridge prep
C) inlay prep
D) implant

Question 28

If the provisional crown does not contact the adjacent teeth, all of the following may occur except:

A) tooth will supererupt
B) tooth may migrate laterally
C) gingival irritation
D) food impaction

Question 29

Accurate margins of an extracoronal provisional restoration are important because:

A) they keep food from packing into the embrasure
B) they maintain occlusion and prevent supereruption
C) they maintain accurate contour
D) they protect the tooth from microleakage

Question 30

Match the items with the correct description below.
Intracoronal restoration

A)The continuous margin that borders the preparation to which the restoration is fit or finished
B)A restoration that covers all or part of the external surface of the tooth and may extend over the cusp tips on facial or lingual surfaces or include the removal of cusps
C)Provisional restoration made on a cast outside the patient's mouth
D)A restoration within the crown of the tooth, such as an inlay
E)Provisional restorations made directly inside the patient's mouth

Question 31

Provisional restorations are recommended only for:

A) 2 to 3 days
B) 2 to 3 weeks
C) 2 to 3 months
D) There is no time limit.

Question 32

Pre-formed crowns could be used for all of the following except:

A) anterior crown prep
B) posterior crown prep
C) three-unit posterior bridge prep
D) fractured anterior tooth

Question 33

If an anterior tooth was fractured or badly decayed before the crown preparation process, the provisional placed would be:

A) polycarbonate
B) zinc oxide eugenol
C) stainless steel
D) custom made

Question 34

Match the items with the correct description below.
Indirect fabrication

A)The continuous margin that borders the preparation to which the restoration is fit or finished
B)A restoration that covers all or part of the external surface of the tooth and may extend over the cusp tips on facial or lingual surfaces or include the removal of cusps
C)Provisional restoration made on a cast outside the patient's mouth
D)A restoration within the crown of the tooth, such as an inlay
E)Provisional restorations made directly inside the patient's mouth

Question 35

Which of the following would not make a good extracoronal provisional restoration?

A) Polycarbonate crown
B) Aluminum shell
C) Stainless steel crown
D) Zinc oxide eugenol cement