Fixed Prosthodontics & the 16-Unit Bridge

Self-Study Examination

Instructions: After studying the text answer the following true/false or multiple choice questions.  Remember, there's only one answer to each question.

1. A sixteen unit bridge has ______ walls.

a) 16
b) 32
c) 48
d) 64

2. The most critical portion of constructing a fixed bridge is:

a) assessing the mouth
b) treatment planning
c) the time factor
d) the goal of the patient

3. The cause of the red ring of inflamed tissue around an anterior tooth is:

a) stress
b) decay
c) a fracture
d) excessive dryness of the oral mucosa

4. The ________ _________ teeth are the most difficult to replace with a fixed bridge.

a) maxillary anterior
b) mandibular anterior
c) mandibular posterior
d) maxillary posterior

5. When a patient has been grinding his teeth for a number of years, the teeth become short and flat and the alveolar bone:

a) is worn down
b) is brittle
c) becomes porous
d) becomes stronger

6. Ante’a Law proposes a relationship between the root surface areas of missing teeth and those of potential abutment teeth.

a) true
b) FALSE

7. A _______ unit fixed bridge is used when two teeth are missing.

a) three
b) four
c) five
d) six

8. The alginate impression material will set faster if:
  1. you use less water
  2. the air is warm and dry
  3. the air is cool and dry
  4. you use warm water with the alginate
  5. you use cold water with the alginate

a) 1 only
b) 1,2, and 5
c) 3 and 4
d) 2 and 4
e) 3 and 5

9. To stop the panic situation caused by gagging the patient:

a) should be aware he can breath through his nose
b) can lean forward in the chair
c) should swallow several times
d) must breath through his nose

10. This bridge is preferred when the central incisor shade is difficult to match:

a) the three unit bridge
b) cuspid swing-on bridge
c) a distal root bridge

11. At the _______ appointment the mesial root is extracted and the distal root should be filled with amalgam.

a) first
b) second

12. Before the bridge is started, the path of insertion needs to be determined. This is to:

a) prevent poor retention
b) have a correct bite
c) avoid over reduction of the teeth
d) keep the margins tight

13. In order to accommodate a porcelain margin the teeth must have:
  1. enough bulk on the labial wall
  2. strong bone structure
  3. adequate length
  4. several abutments

a) 2 and 3
b) 2 and 4
c) 1 and 2
d) 1 and 3
e) 2 only

14. The 90-degree shoulder is approximately one millimeter in width.

a) true
b) FALSE

15. When the tooth is close to an exposure, the enamel is ________ than the dentin.

a) darker
b) lighter

16. When cutting off a bridge, the groove is placed:

a) on an anterior crown because it is easiest
b) under the metal of the crown
c) on the most distal crown first because of the difficulty
d) where the least pressure is required

17. The most difficult area of the sixteen unit bridge is:

a) the distal walls of the molars and bicuspids need to converge with the labial walls of the anteriors
b) there are more walls to consider
c) the horseshoe effect is missing because it is long
d) covering exposed roots

18. When evaluating soft tissue of the mouth:
  1. the roots are assessed
  2. teeth with spaces between them require larger teeth in the bridge
  3. periodontal pockets are checked
  4. the size of the tongue is evaluated

a) 1 and 3
b) 3 only
c) 4 only
d) 2 and 4
e) 1 and 2

19. At the ________ point the gingival may be hemorrhaging severely.

a) first
b) second
c) third

20. In this procedure, light and heavy impression materials are mixed simultaneously:

a) two syringe impression technique
b) the compressed impression

21. All major adjustments are made on the inside of the laboratory temporary to preserve the surface finish.

a) true
b) FALSE

22. The acrylic temporary is polished with a rag wheel and pumice. Both the rag wheel and pumice are ______. Rough surfaces are removed using a _______ speed.

a) dry, high
b) wet, high
c) dry, slow
d) wet, slow

23. Regular yellow stone can be used for the:

a) impression pour
b) alginate pour

24. This is an easy appointment and exciting moment:

a) the metal try in appointment
b) the biscuit bake appointment
c) the insertion appointment

25. When the cement is dry, the excess can be removed :
  1. with a Hollenbeck and "C" explorer
  2. by asking the patient to rinse out their mouth
  3. with a wet two-by-two
  4. with a spatula

a) 1 and 3
b) 2 and 3
c) 1 and 4
d) 2 only
e) 3 only