Week 11 - Provisional Conventional / Canteliever Bridges

Question 1

1. In the provisional cantilever bridge construction UR5–UR4, which tooth serves as the abutment?
   A) UR6
   B) UR4
   C) UR5
   D) UR3

Answer 1

C

Question 2

2. In a conventional cantilever bridge replacing UR4, what pontic design is recommended?
   A) Sanitary
   B) Ovate
   C) Modified ridge lap
   D) Conical

Answer 2

C

Question 3

3. When preparing for a fixed-fixed bridge, why must the same surfaces be prepared in both abutment teeth?
   A) It improves pulp vitality
   B) It increases bulk of cement
   C) It ensures parallelism
   D) It reduces tooth wear

Answer 3

C

Question 4

4. Which surface should be prepared first when doing occlusal reduction for a fixed-fixed bridge?
   A) Buccal of UR7
   B) Occlusal of one tooth
   C) Mesial of both teeth
   D) Distal of one tooth

Answer 4

B

Question 5

5. What is the purpose of a functional cusp bevel in posterior FVC bridge preps?
   A) Maximise retention
   B) Improve marginal seal
   C) Maintain pulp health
   D) Preserve enamel

Answer 5

A

Question 6

6. Which material is commonly used for chairside provisional bridges?
   A) Polyether
   B) Bis-acryl composite (e.g., Integrity)
   C) Light-cured GIC
   D) Porcelain fused to metal

Answer 6

B

Question 7

7. In the UR5–UR4 provisional cantilever bridge, what is used to form the bridge structure?
   A) Polycarbonate shell
   B) Composite crown matrix
   C) Putty index with integrity
   D) Temporary crown shell

Answer 7

C

Question 8

8. When preparing a tooth for a fixed-fixed bridge, which of the following is correct?
   A) Prepare one entire tooth before the next
   B) Prepare occlusal, buccal, palatal, then all surfaces on the second tooth
   C) Prepare occlusal of both teeth first, then buccal, palatal, mesial, and distal
   D) Only reduce functional cusps

Answer 8

C

Question 9

9. Which temporary cement is not suitable for final restorations involving resin bonding?
   A) Temp Bond NE
   B) Temp Bond (eugenol)
   C) Glass ionomer cement
   D) Resin-modified GIC

Answer 9

B

Question 10

10. In a provisional bridge, the pontic must:
    A) Be left under-contoured
    B) Impinge on soft tissue for retention
    C) Be shaped with a modified ridge lap
    D) Have a flat occlusal surface

Answer 10

C

Question 11

11. The use of a putty index in provisional bridge fabrication is for:
    A) Long-term prosthesis retention
    B) Checking occlusion
    C) Forming accurate shape of provisional
    D) Reducing chair time only

Answer 11

C

Question 12

12. Which of the following is a function of provisional bridges?
    A) Long-term soft tissue replacement
    B) Protect dentine and pulp
    C) Permanent occlusal restoration
    D) Remove opposing contacts

Answer 12

B

Question 13

13. Which of the following temporary crown materials is prefabricated?
    A) Bis-acryl composite
    B) Myerson’s C&B resin
    C) Polycarbonate shell
    D) Trim

Answer 13

C

Question 13

14. What is the main purpose of having a parallel path of insertion in fixed-fixed bridges?
    A) Better aesthetics
    B) Prevent pulp exposure
    C) Ensure the bridge fits both abutments simultaneously
    D) Improve hygiene access

Answer 13

C

Question 14

15. The modified ridge lap pontic design provides a balance between:
    A) Hygiene and passive eruption
    B) Retention and occlusion
    C) Aesthetics and hygiene
    D) Stability and retrievability

Answer 14

C

Question 15

16. Which material is NOT suitable for direct chairside provisional restorations?
    A) Trim
    B) Protemp
    C) Stainless steel crown
    D) GIC Type II

Answer 15

D

Question 16

17. What polishing system is used to finish provisional restorations?
    A) Soflex discs
    B) Rainbow discs
    C) Arkansas stones
    D) Polishing wheels

Answer 16

B

Question 17

18. What is the primary reason for provisional bridge placement during fixed prosthodontic treatment?
    A) Improve gingival tone
    B) Test occlusion
    C) Protect the preparation
    D) Aid in colour matching

Answer 17

C

Question 18

19. What kind of preparation is typically made on a posterior tooth planned for an FVC?
    A) Chamfer margin
    B) Knife edge
    C) Feather edge
    D) Shoulder

Answer 18

D

Question 19

20. A modified Essex retainer is sometimes used for:
    A) Long-term cementation
    B) Interim partial dentures
    C) Temporary anterior replacement
    D) RBB temporisation

Answer 19

D

Question 20

41. When preparing an FVC for a posterior fixed-fixed bridge, how much occlusal reduction is typically required?
    A) 1 mm
    B) 1.5 mm
    C) 2 mm
    D) 3 mm

Answer 20

c

Question 21

42. Which part of a putty index should be cut away to allow space for provisional material?
    A) Buccal segment
    B) Palatal segment
    C) Occlusal and interproximal areas
    D) Gingival margin

Answer 21

c

Question 22

3. What is a critical reason to polish provisional restorations before fitting?
   A) To improve colour
   B) To make cementation easier
   C) To reduce bacterial adhesion and gingival irritation
   D) To increase resin bond strength

Answer 22

c

Question 23

44. The most suitable cement for a long-span provisional bridge would be:
    A) Zinc phosphate
    B) GIC Type I
    C) Temp Bond NE
    D) Polycarboxylate

Answer 23

c

Question 24

45. Which of the following minimises displacement of a bridge restoration during cementation? A) High taper B) Wide shoulder margin C) Good resistance form D) Resin-modified glass ionomer

Answer 24

C

Question 25

6. Why must functional cusps be reduced more than non-functional cusps in bridge prep? A) To provide visual reference B) To prevent premature contacts C) To match gingival contour D) To increase convergence

Answer 25

B

Question 26

47. What is the most important consideration when removing a provisional bridge? A) Use a crown remover B) Preserve the fit surface C) Use ultrasonic scalers D) Section the bridge with a bur

Answer 26

B

Question 27

48. Which pontic design does not contact the ridge and is easy to clean but least aesthetic? A) Ovate B) Modified ridge lap C) Conical D) Sanitary

Answer 27

B

Question 28

9. During bridge prep, what helps confirm adequate axial reduction? A) Use of a periodontal probe B) Visual estimation C) Depth grooves D) Opposing arch stone model

Answer 28

C

Question 29

50. Why is a provisional bridge important in periodontal patients? A) Encourages plaque accumulation B) Helps evaluate gingival response C) Reduces occlusal contact D) Covers recession sites

Answer 29

B

Question 30

51. When preparing a posterior FVC, which bur is commonly used for occlusal reduction? A) Flame-shaped diamond B) Flat-end tapered diamond C) Round bur D) Wheel bur

Answer 30

B

Question 31

52. Which factor is most likely to cause dislodgement of a cantilever pontic? A) Good occlusal contact B) Excess connector thickness C) Heavy occlusion on pontic D) Minimal taper

Answer 31

C

Question 32

53. Which feature is included in posterior full veneer crown preps for mechanical retention? A) Chamfer finish line B) Non-parallel axial walls C) Retentive grooves D) Gingival shoulder

Answer 32

C

Question 33

55. When polishing bis-acryl provisional material, what must be avoided to prevent distortion? A) Applying water spray B) Overheating C) Using polishing compound D) Avoiding occlusion

Answer 33

B

Question 34

6. A common clinical error during bridge preparation is: A) Leaving functional cusp bevels B) Over-reducing incisal edge C) Under-tapering the axial walls D) Not ensuring a common path of insertion

Answer 34

D

Question 35

57. The main difference between fixed-fixed and cantilever bridges is: A) Pontic design B) Occlusion C) Number of abutments D) Cement type

Answer 35

C

Question 36

58. How long should a provisional bridge typically remain in place before final cementation? A) 1–2 days B) 1 week C) 2–3 weeks D) 3 months minimum

Answer 36

c

Question 37

59. When using a putty matrix, why is it trimmed at the gingival margin? A) So it doesn't distort gingiva B) To improve aesthetics C) To allow margin visibility D) To allow cement escape

Answer 37

A

Question 38

60. The ideal thickness of a provisional pontic contacting the ridge should be: A) 0.2–0.3 mm B) Passive contact only C) 1.0 mm D) Deep pressure into tissue

Answer 38

B