Fixed Prosthodontics#

Question 1

In the preparation of an upper first molar to recieve a porcelain-bonded crown, which area of the tooth will have the maximum reduction?
A - buccal, apical third
B - buccal, coronal third
C - distal finishing line
D - non-working cusp
E - Working cusp

Answer 1

E - Working cups
Buccal on lower molars
Palatal on upper molars

Question 2

A 24-year-old woman attends your practice with the chief complaint of repetitive fracture of restoration in the upper-right molar tooth. Upon intra-oral examination, it was observed that 16 had temporary restoration with loss of the disto-palatal cusp. The pulp was vital on electric testing, but the remaining tooth structure was considered inadequate for a new direct resin composite filling.
Which of the following conditions is most likely to influence you to choose an inlay, rather than an onlay?
Your answer was incorrect
A
Group function
B
Height-to-width ratio of > 1: 1
Restoration size less than one-third of buccal-lingual width
D
Parafunctional habits
E
Severely undermined cusps

Answer 2

C - restoration size less than one-third of buccal-lingual width

Question 3

You are restoring a posterior tooth with a post and core.
Which combination of post and core will produce the lowest stress with a root?
Your answer was correct
A
Cast metal post and core (laboratory made)
B
Composite resin post and core
Composite resin core in combination with a glass fibre post
D
Parallel prefabricated metal post
E
Tapered prefabricated metal post

Answer 3

B - Composite resin post and core
Composite resin core in combination with a glass fibre post

Question 4

Your patient had a root filling in the right maxillary second molar tooth. You have decided to restore it with a full gold crown.
Which of the following preparations would be considered to be best practice?
Your answer was correct
A
Chamfer finishing line, 30° taper
B
Chamfer finishing line, 10° taper
С
Shoulder finishing line, 0° taper
D
Shoulder finishing line, 10° taper
E
Shoulder finishing line, 30° taper

Answer 4

B - Chamfer finishing line, 10° taper

Question 5

What bonds to tooth better, precious of non precious metal?

Answer 5

Non precious

Question 6

What is a disadvantage of non-precious metal inlays/onlays

Answer 6

Difficult to adjust chairside
More likely to wear opposing teeth

Question 7

Occlusal clearance required for ceramic onlay?

Answer 7

1.5-2mm

Question 8

Internal angles for gold inlay - round or sharp

Answer 8

Sharp