Deck 18: Provisional Restorations

Question 1

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

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

Answer 1

High shrinkage

Question 2

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.

Answer 2

A template of the tooth before preparation is obtained using wax or an impression material directly in the mouth.

Question 3

_____ 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

Answer 3

Heat

Question 4

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 5

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

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

Question 6

Which of the following are advantages of composite provisional materials in contrast to acrylic provisional materials?
1)High shrinkage during curing
2)High heat release during curing
3)More wear
4)Biocompatibility

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

Question 7

How long would it take a prepared tooth without occlusal/incisal and proximal contact to migrate laterally or occlusally/incisally?

A) Days
B) Weeks
C) Months
D) Years

Question 8

Which of the following is true of preformed polycarbonate provisional crowns?

A) They are incompatible with acrylic resins.
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) Unlike their metal partners,they do not come in several sizes and shapes.

Question 9

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 10

What are preformed celluloid forms and polymer crowns filled with?

A) Acrylic or BIS-acrylic composite
B) Zinc oxide eugenol cement
C) Gutta percha
D) Resin cement

Question 11

Cement provisionals are most frequently fabricated with which material?

A) Zinc polycarboxylate
B) Zinc oxide eugenol
C) Calcium hydroxide
D) Zinc phosphate

Question 12

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

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

Question 13

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 14

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

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

Question 15

Why must care be taken in the fabrication of provisionals by utilizing acrylic materials to "pump" the template on and off the preparation after initial polymerization?

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 16

Which of the following is the most durable of the preformed crowns?

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

Question 17

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) denture adhesive
D) chewing gum

Question 18

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 19

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

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

Question 20

What home care instructions would be given to a patient with a provisional restoration?

A) Do not brush or floss the restoration.
B) Brush but do not floss the restoration.
C) Brush and floss the restoration as you would any other tooth.
D) Brush and floss the restoration,sliding the floss through the cervical embrasure.

Question 21

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 restoration made directly inside the patient's mouth

Question 22

Accurate margins of an extracoronal provisional restoration are important because they:

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

Question 23

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 restoration made directly inside the patient's mouth

Question 24

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 restoration made directly inside the patient's mouth

Question 25

List and describe the four criteria for provisional coverage.

Question 26

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

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

Question 27

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 restoration made directly inside the patient's mouth

Question 28

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

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

Question 29

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

Question 30

Which factor,associated with a provisional restoration,is responsible for irritation,inflammation,and recession of the gingiva?

A) Chewing hard foods
B) Poor marginal coverage
C) Contour of the provisional
D) Brushing and flossing the provisional

Question 31

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 restoration made directly inside the patient's mouth

Question 32

What is the most common use of a stainless steel crown?

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 33

Which of the following would not occur if the provisional crown does not contact the adjacent teeth?

A) Tooth may migrate laterally
B) Tooth will supererupt
C) Gingival irritation
D) Food impaction

Question 34

What is the provisional of choice if an anterior tooth is fractured or badly decayed before the crown preparation process?

A) Custom made
B) Polycarbonate
C) Stainless steel
D) Zinc oxide eugenol

Question 35

Which condition below would not require a preformed crown to be used?

A) Anterior crown prep
B) Posterior crown prep
C) Fractured anterior tooth
D) Three-unit posterior bridge prep

Question 36

Provisional restorations are recommended only for 2 to 3:

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