Deck 50: Fixed Prosthodontics

Question 1

Each component of a fixed bridge is referred to as a:

A)tooth.
B)crown.
C)unit.
D)core.

Answer 1

unit.

Question 2

A(n) _____ is a cast restoration that is designed to fit snugly within a tooth preparation such as a class II restoration and that covers only a portion of the occlusal and proximal surface.

A)onlay
B)inlay
C)crown
D)veneer

Answer 2

inlay

Question 3

When the patient has a fixed prosthesis,such as a three-unit bridge,the area under the pontic is maintained by:

A)brushing with a toothbrush.
B)threading dental floss under the pontic with a bridge threader.
C)irrigation with a cannula.
D)swishing with a mouthrinse.

Answer 3

threading dental floss under the pontic with a bridge threader.

Question 4

A _____ crown does not cover the entire anatomic portion of the tooth.

A)full
B)three-quarter
C)porcelain-fused-to-metal
D)gold

Question 5

The material placed under a porcelain restoration to mask tooth discoloration is a(n):

A)pontic.
B)abutment.
C)opaque.
D)luting agent.

Question 6

The final appointment in the crown and bridge process involves:

A)cementation of a permanent crown.
B)try-in of the casting.
C)picking a shade.
D)writing the laboratory prescription.

Question 7

Which of the following is an example of a fixed prosthesis?

A)Composite resin
B)Silver dental amalgam
C)Three-unit bridge
D)Pin-retained silver dental amalgam

Question 8

Which of the following procedures takes place during the second appointment for the placement of a cast restoration?

A)Shade selection
B)Preliminary impressions
C)Final impressions
D)Try-in

Question 9

A prosthodontist:

A)is a dentist who is dedicated to restoring and replacing teeth focusing on fixed or removable prosthodontics.
B)has received an additional 3 years of training in a program accredited by the American Dental Association.
C)is a general dentist who works a lot with crowns, inlays, onlays, and bridges.
D)both a and b

Question 10

The metal of choice for inlay and onlay cast restorations is:

A)porcelain.
B)ceramics.
C)gold.
D)amalgam.

Question 11

A gingival retraction cord is placed _____ the crown preparation is completed; it is removed _____ the final impression is taken.

A)after; after
B)after; before
C)before; after
D)before; before

Question 12

Which of the following statements is true concerning porcelain veneers?

A)They are usually recommended to improve chewing efficiency of posterior teeth.
B)The color of the finished veneer can be affected by the shade of the underlying tooth structure and by the color of the luting agent.
C)Porcelain veneers do not involve preparation of tooth structure.
D)Provisional coverage is required following impressions for porcelain veneers.

Question 13

An important step in placing a porcelain veneer is:

A)making a provisional to be worn while the veneer is being made.
B)matching the tooth color of the veneer to the adjacent teeth.
C)making sure the veneer is thick enough block out underlying color.
D)making the cement used a shade darker than the veneer.

Question 14

The component of the bridge that provides support for the replacement teeth is a(n):

A)abutment.
B)pontic.
C)unit.
D)core.

Question 15

When one or more teeth are missing from the same arch,a permanent _____ is recommended.

A)partial denture
B)fixed bridge
C)porcelain-fused-to-metal crown
D)denture

Question 16

The component of a fixed bridge that replaces a missing natural tooth is the:

A)abutment.
B)pontic.
C)unit.
D)core.

Question 17

An indirect restoration:

A)is also known as a cast restoration.
B)is permanent.
C)can be an inlay, onlay, crown, or bridge.
D)all of the above.

Question 18

_____ can be used in selected situations,such as a replacement for a congenitally missing lateral incisor,as an alternative to a traditional bridge.

A)A resin-bonded bridge
B)A Maryland bridge
C)Both a and b
D)A crown

Question 19

A post can be used as a retention aid for a crown,provided that the tooth:

A)is vital.
B)has been treated endodontically.
C)has not been treated endodontically.
D)is non-restorable.

Question 20

A full metal crown that has the outer layers covered with a thin layer of porcelain is a(n):

A)porcelain jacket crown.
B)porcelain-fused-to-metal crown.
C)onlay.
D)three-quarter crown.

Question 21

The purpose of a core buildup is to:

A)support the cast crown.
B)provide a larger area of surface retention for cementation.
C)both a and b.
D)neither a nor b; core buildups are not used with cast crowns.

Question 22

The tapered finish line of the margin at the cervical area of a tooth preparation is a(n):

A)articulator.
B)chamfer.
C)core.
D)shoulder.

Question 23

Which statement is true of a fixed bridge?

A)There are at least two abutment teeth in a fixed bridge.
B)The fixed bridge is described by the number of units involved.
C)A fixed bridge consists of at least one abutment and one pontic.
D)Both b and c are true statements.

Question 24

A Maryland bridge is held in place by:

A)abutments on either side of the pontic.
B)wing-like extensions bonded onto the lingual surfaces of the adjacent teeth.
C)clasps that are attached to the adjacent teeth.
D)shoulders that extend to the adjacent teeth.

Question 25

The most common method to obtain gingival retraction is:

A)chemical retraction.
B)mechanical retraction.
C)surgical retraction.
D)completed with an infuser.

Question 26

When assisting with the final impression in a crown and bridge preparation,the operator may "blow" around the light-bodied impression material before inserting the heavy-bodied material.The purpose of this procedure is to:

A)dry the area off.
B)make it easier for the operator to see the margins of the preparation.
C)make it easier to set the impression tray.
D)thin out the material to allow it to flow better within the sulcus and around the margins.

Question 27

A cast post is:

A)cemented into the pulp canal.
B)made from an acrylic pattern by a dental laboratory technician.
C)both a and b.
D)used to add height to the core buildup.

Question 28

An indication for prescribing fixed prosthodontics is that:

A)the patient wants it.
B)one or two adjacent teeth are missing in the mouth.
C)supportive teeth are healthy.
D)all of the above.

Question 29

Which of the following should be included on the laboratory prescription?

A)Dentist's name, license number, address, and signature
B)Type of prosthesis requested
C)Date when the case is expected back
D)All of the above

Question 30

The opening into which the post is cemented is a:

A)keyway slot.
B)chamfer.
C)shoulder.
D)post channel.

Question 31

Which statement is not true concerning retention pins?

A)Retention pins may be necessary to add strength to the core buildup.
B)The location of the pulp determines the exact location of the placement of the pins.
C)Retention pins can only be used if the tooth has been treated endodontically.
D)The type of crown being fabricated is a determining factor for the placement of the pins.

Question 32

In general,the purposes of provisional coverage are to:

A)maintain and/or restore tooth function.
B)provide comfort for the patient while the permanent restoration is being fabricated.
C)protect the margins of the prepared tooth.
D)all of the above.

Question 33

If a patient has a medical history of cardiovascular disease,the use of:

A)plain cords is advised.
B)cords impregnated with epinephrine is contraindicated.
C)cords is contraindicated and an alternative method is advised.
D)an infuser is advised.

Question 34

The device that is used to determine the tooth color for ceramic crowns or bridges is a(n):

A)articulator.
B)chamfer.
C)shade guide.
D)infuser.

Question 35

Materials used for a core buildup include:

A)self-curing composite material.
B)reinforced glass ionomer cement.
C)amalgam.
D)any of the above may be used.

Question 36

Which statement(s) is true of packing retraction cord?

A)It is important to place the retraction cord into the sulcus without damaging the surrounding gingival tissues.
B)The placement and removal of gingival retraction cord are expanded functions and may be performed by a dental assistant trained in expanded functions.
C)Generally, the operator removes the cord while the assistant prepares the impression material.
D)All of these statements are true.