This document contains 47 multiple choice questions related to prosthodontics. Some key topics covered include: - Factors to consider when selecting abutment teeth and designing fixed bridges, such as crown-root ratios, tooth alignment, and periodontal support. - Design considerations for fixed bridge pontics, such as contour, materials, and types (e.g. modified ridge lap). - Complications that can arise from inadequate temporary restorations on abutment teeth. - Treatment planning questions regarding situations like replacing a missing lateral incisor or utilizing a tilted molar as an abutment. - Foundation restoration options and techniques to improve abutment tooth structure.

1. NAGHMAN ZUBERI DENTAL LECTURES
AFK SERIES
PRACTICE QUESTIONS
PROSTHODONTICS

3. 1. In a fixed bridge, the most favorable ratio for an
abutment tooth is when the root?
A. and clinical crown are equal in length
B. is twice the length of the clinical crown.
C. is half the length of the clinical crown.

4. 2. Which of the following problems of a permanent
fixed bridge, detected at the delivery appointment, can
be caused by an inadequate temporary restoration?
1. Hypersensitivity of the abutments that decreases
after permanent luting.
2. Exposed gingival margins in an area.
3. Contacts with adjacent teeth that prevent complete
seating of the bridge.
4. Need for significant occlusal adjustment.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
4. (4) only
5. All of the above.

5. 3. For teeth prepared as abutments for fixed bridges,
unsatisfactory temporary crown restorations may result
in
1. tooth sensitivity.
2. gingival recession.
3. tooth migration.
4. occlusal prematurities.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
4. (4) only
5. All of the above.

6. 4. Diagnostic casts for a fixed bridge allow the dentist to
1. visualize the direction of the occlusal forces.
2. assess occlusion more accurately.
3. plan the pontic design.
4. assess the esthetics using a diagnostic waxup.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

7. 5. What is the alloy of choice for the framework of a
resin-bonded fixed bridge?
A. Nickel-chromium.
B. Gold-palladium.
C. Gold-silver.
D. Gold-platinum-palladium

8. 6. Whenever possible, the margins of a restoration
should be placed
1. subgingivally.
2. supragingivally.
3. on cementum.
4. on enamel.
A. (1) (2) (3)
B. (1) and (3)
3. (2) and (4)
4. (4) only
5. All of the above.

9. 7. A pontic exerting too much pressure against the ridge
may cause
1. fracture of the solder joints.
2. hypertrophy of the soft tissue.
3. crazing of the gingival portion of the porcelain.
4. resorption of the alveolar bone.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

10. 8. A fixed bridge pontic should
1. restore tooth function.
2. reduce thermal conductivity.
3. be biologically acceptable.
4. reduce galvanic reactions between abutments and
other restorations.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

11. 9. A pontic should
A. exert no pressure on the ridge.
B. be contoured by scraping the master cast.
C. have a large surface area in contact with the ridge.
D. contact nonkeratinized tissue.

12. 10. Which of the following pontic designs will make it
most difficult to maintain optimal oral hygiene?
A. Modified ridge lap.
B. Hygienic.
C. Saddle.
D. Conical.
E. Ovoid.

13. 11. A fixed partial denture with a single pontic is
deflected a certain amount, a span of two similar
pontics will deflect ?
A. the same amount.
B. twice as much.
C. four times as much.
D. eight times as much.

14. 12. Which pontic type is best for a knife edge residual
ridge where esthetics is not a major concern?
A. Sanitary.
B. Conical.
C. Ridge lap.
D. Modified ridge lap.

15. 13. Pontic design for a metal-ceramic bridge should
1. provide for a rigid restoration.
2. allow for complete coverage of the metal by the
porcelain.
3. place the porcelain metal joint away from the soft
tissues.
4. control thermal conductivity.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

16. 14. A pontic replacing a mandibular first molar should
be designed so that it/its
1. gingival surface is concave and adapts closely to the
ridge.
2. has open gingival embrasures.
conceals the porcelain to metal junction on its gingival
surface.
3. gingival surface is convex in all directions.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

17. 15. Which of the following pontic designs is most likely
to cause soft tissue irritation?
A. Polished gold.
B. Polished acrylic.
C. Polished porcelain.
D. Glazed porcelain.

18. 16. A metal ceramic posterior fixed partial denture
pontic should
A. be constructed to have an occlusal surface one
quarter the width of the tooth it replaces. 2/3 0f tooth
replaced
B. be constructed to have an occlusal surface wider than
the width of the tooth it replaces.
C. cover as much mucosa as possible.
D. provide adequate embrasure spaces.

19. 17. A conical pontic replacing a mandibular first molar
should be designed so that
A. it seals the mucogingival fold.
B. it has open gingival embrasures.
C. the porcelain to metal junction is on its gingival
surface.
D. the gingival surface is concave buccolingually.

20. 18. The gingival aspect of a pontic which touches the
alveolar ridge should be
A. A.convex only in the mesiodistal direction.
B. concave faciolingually and convex mesiodistally.
C. small and convex in all directions.
D. fabricated to produce slight tissue compression.

21. 19. The gingival aspect of a modified ridge lap pontic
which touches the alveolar ridge should be
A. slightly concave in all directions.
B. slightly concave faciolingually and convex
mesiodistally.
C. slightly small and convex in all directions.
D. fabricated to produce slight tissue Compression

22. 20. Fixed partial denture pontics should
A. completely replace the missing supragingival tooth
structure.
B. have a concave surface touching the mucosa.
C. have minimal soft tissue coverage.
D. hide the porcelain-metal junction on their gingival
aspect.

23. 21. Improper temporary coverage of bridge abutments
can cause
A. increased tooth sensitivity.
B. gingival recession.
C. tooth migration.
D. occlusal prematurities.
E. All of the above.

24. 22. A 60 year old patient requests the replacement of tooth 4.6,
which was extracted many years ago. Tooth 1.6 has extruded
1.8mm into the space of the missing tooth. The three unit fixed
bridge replacing the mandibular first molar should be fabricated
A. to the existing occlusion.
B. after extracting tooth 1.6 and replacing it with a fixed partial
denture.
C. after restoring tooth 1.6 to a more normal plane of occlusion.
D. after devitalizing and preparing tooth 1.6 for a cast crown.

25. 23. In fixed bridge construction, when the vertical
dimension has to be increased, the most important
consideration is that
A. there is sufficient tooth bulk in the abutment teeth
for retention.
B. the interocclusal distance will be physiologically
tolerated.
C. the aesthetic appearance of the patient will be
improved.
D. a favorable crown-root ratio is established.

26. 24. A zirconia-based ceramic fixed partial denture can
be used for a patient with
A. periodontally involved abutment teeth.
B. long clinical crowns.
C. deep vertical anterior overlap.
D. cantilever pontic.
E. evidence of bruxism.

27. 25. Which of the following is NOT a direct physiological
response to additional forces placed on abutment
teeth?
A. Resorption of bone.
B. Increase thickness of cementum.
C. Increased density in cribiform plate.
D. Decrease in width of periodontal ligament.

28. 26. A survey of the master cast shows that the 3.5 and
3.7 abutments for a fixed partial denture have different
paths of insertion with respect to 3.7. A semi-precision
attachment is chosen rather than preparing the teeth
again. Where should the male part of the attachment
ideally be located?
A. Distal of the 3.5 retainer.
B. Distal of the 3.6 pontic.
C. Mesial of the 3.7 retainer.
D. Mesial of the 3.6 pontic.

29. 27. If a complete occlusal adjustment is necessary,
interferences should be corrected
A. after all restorative procedures are completed.
B. after each restorative procedure.
C. before starting any restorative treatment.
D. during treatment.

30. 28. Flexing of a fixed partial denture under occlusal
loads is
A. proportional to the cube of the width of its pontics.
B. linearly proportional to the length of the span.
C. decreased with the use of a high strength material.

31. 29. Seating of a fixed partial denture may be hindered if
A. a void exists on the internal surface of the casting.
B. the gingival margins are overcontoured.
C. the gingival margins are open.
D. the pontic is overcontoured gingivally.

32. 30. A tilted molar can be used as a fixed partial denture
abutment if
1. it undergoes orthodontic uprighting first.
2. a coping and telescopic crown are used on the
abutment.
3. a non-rigid connector is placed in the fixed partial
denture.
4. its long axis is within 25° of the long axis of the other
abutments.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

33. 31. Which of the following unilateral fixed partial
dentures is most likely to have insufficient periodontal
support? A fixed partial denture extending from the
A. maxillary first premolar to the first molar.
B. maxillary canine to the first molar.
C. mandibular central incisor to the first premolar.
D. mandibular second premolar to the second molar.

34. 32. Minor tooth movement to correct an inclined fixed
1. partial denture abutment will
2. enhance resistance form of the abutment.
3. reduce the possibility of pulpal exposure.
4. direct occlusal forces along the long axis of the tooth.
5. improve embrasure form.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All the above.

35. 33. Which of the following is a CONTRAINDICATION for
the use of a resin bonded fixed partial denture (acid
etched bridge or “Maryland Bridge”)?
A. Angle Class II malocclusion.
B. An opposing free end saddle removable partial.
C. Previous orthodontic treatment.
D. Heavily restored abutment.

36. 34. Advantages of resin bonded bridges are
1. tooth structure conservation.
2. short chair-side time.
3. lower cost for patient.
4. improved esthetics compared to traditional bridges.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

37. 35. Nickel-chromium alloys designed for porcelain
bonded to metal crowns should be used with caution
because
A. nickel is an allergen.
B. the modulus of elasticity is low.
C. these alloys cannot be soldered.

38. 36. Which of the following restorations is the most
appropriate for the replacement of a maxillary
permanent lateral incisor where there is 4.5mm of
mesial-distal space and an intact central incisor?
A. Implant supported restoration.
B. Cantilever pontic FPD using canine abutment.
C. Removable partial denture.
D. Three-unit metal-ceramic full-coverage fixed dental
prosthesis.

39. 37. The choice and number of abutments for a fixed
partial denture is influenced by the
1. length of the span.
2. crown-root ratio of the abutments.
3. amount of periodontal support of the abutments.
4. position of the abutments in the arch.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

40. 38. The most appropriate gingival contour of a fixed
partial denture connector is
A. concave.
B. convex.
C. flat.

41. 39. A fixed partial denture is an appropriate treatment
option for replacing a missing mandibular first
permanent molar when the
A. adjacent teeth are heavily restored.
B. incisors and contralateral molars are missing.
C. abutment crown to root ratios are 1:1.
D. second and third molars are tipped mesially.

42. 40. A "broken stress" or "non-rigid" connector is
indicated for a fixed partial denture when
A. the retainers can be so prepared as to have equal
retentive qualities.
B. 2 or 3 teeth are to be replaced.
C. constructing a mandibular fixed prosthesis.
D. the abutments cannot be prepared in parallel
without excessive removal of tooth structure.

43. 41. Which of the following would require a custom
incisal guide table for a patient with mutually protected
occlusion?
A. A fixed partial denture from tooth 3.5-3.7.
B. An all ceramic crown on tooth 4.7.
C. A fixed partial denture from tooth 1.1-1.3.
D. A single ceramometal crown on tooth 1.4.

44. 42. Which of the following teeth is the LEAST desirable
to use as an abutment tooth for a fixed partial denture?
A. Tooth with pulpal involvement.
B. Tooth with minimal coronal structure.
C. Tooth rotated and tipped out of line.
D. Tooth with short, tapered root and a long clinical
crown.

45. 43. The most likely reason for porcelain fracturing off a
long and narrow metal-ceramic fixed partial denture is
that the framework alloy had an insufficient
A. elastic modulus.
B. proportional limit.
C. fracture toughness.
D. tensile strength.

46. 44. A vital canine is to be used as the anterior abutment
of a four unit fixed partial denture and it has 2.0mm
remaining coronal tooth structure. The most acceptable
foundation restoration would be
A. bonded amalgam core build-up.
B. a pin retained amalgam core build-up.
C. a pin retained composite resin core buildup.
D. intentional devitalization followed by a post and core
restoration.

47. 45. The crown-root ratio is
1. the comparison of the length of root retained in bone
2. to the amount of tooth external to it.
3. an important factor in abutment tooth selection.
4. determined from radiographs.
5. determined during surveying of the diagnostic cast.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
D. All of the above.

48. 46. The preparation of an anterior tooth for a metal-
ceramic crown should provide
1. adequate length for retention and resistance form.
2. space for thickness of metal that will resist
deformation.
3. space for thickness of porcelain.
4. a single path of insertion.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

49. 47. If a tooth has an inadequate ferrule, which of the
following is/are effective strategies to increase tooth
structure available for crown preparation?
1. Surgical crown lengthening.
2. Sub-gingival preparation and prolonged
temporization.
3. Orthodontic eruption.
4. Elective endodontic treatment gaining retention from
a post in the root.
A. (1) and (3)
B. (2) and (4)
C. (1) (2) (3)
D. (4) only
E. All of the above.

50. 48. If a tooth has an inadequate ferrule, which of the
following is an effective strategy to increase tooth
structure available for crown preparation?
A. Cementation of the restoration with a glass ionomer
cement.
B. Sub-gingival preparation and prolonged
temporization.
C. Orthodontic eruption.
D. Elective endodontic treatment and a post core

51. 49. Assuming there is adequate tooth structure
remaining, composite resins can be used as a core
material for endodontically treated teeth to be crowned
provided
A. the resin has a high contrast colour with tooth
structure.
B. there is an adequate ferrule.
C. the resin is autopolymerizing.
D. subsequent crown margins are not located on
cementum.

52. 50. Composite resin is a satisfactory core material for
endodontically treated teeth provided
A. the resin has a high contrast colour with tooth
structure.
B. there is an adequate ferrule.
C. the resin is autopolymerizing.
D. subsequent crown margins are not located on
cementum.