Fixed Pros

Question 1

Symptoms of cracked cusp:

Answer 1

Pain with:

• Hot/cold stimuli
• Loading or release of biting pressure
• Sweet sensitive
• Sharp fleeting pain on biting
• May linger as a dull ache for 15-30 mins after a meal

Question 2

Tests for cracked cusp syndrome:

Answer 2

• Discolouration
• Transillumination
• Staining (caries detector dye)
• Cold test
• Selective loading pressure over suspected cusps

Question 3

What is the difference between simple, complex, compound and complicated tooth fractures

Answer 3

• Simple = enamel
• Complex = enamel and dentine
• Compound = pulp involvement
• Complicated = crown root

Question 4

Retention form of fixed prostheses is influenced by:

Answer 4

• Degree of taper
• Total surface area for cement
• Roughness of tooth surface

Question 5

Resistance form of fixed prostheses is enhanced by:

Answer 5

• Preparation length
• Preparation width
• Taper
• Prevention of rotation
• Limited path of insertion

Question 6

What width do chamfers need to be for

a) gold
b) ceramic
c) PFM (shoulder)

Answer 6

a) 0.5mm
b) 1.0mm
c) 1.5mm

Question 7

The aim of gingival retraction is to gain crevicular width of:

Answer 7

0.2mm

Question 8

To achiee a crevicular width of 0.2mm, cord must remain in the crevice for an optimum of how long?

Answer 8

4 mins

Question 9

The CR is the same at various OVD before translation

True or false

Answer 9

True

Question 10

What is CR

Answer 10

Condylar position located in anterior superior position against the posterior slope of the articular eminence

Question 11

What two skeletal classes won’t have anterior guidance in protrusive movements.

Answer 11

• Class III
• Class II Div I

Question 13

What is a key change you need to do when preparing a partial coverage for multiple unit prosthesis?

Answer 13

Needs to have resistance to lateral forces so drop palatal margin to gingival level

Question 14

List 5 indications for resin bonded bridges

Answer 14

1. Replacement of lateral incisors and mandibular incisor
2. Unrestored teeth
3. Poor root angulation or insufficient bone for implant
4. Light or no occlusal forces
5. Periodontal splints

Question 15

List 5 contra indications for resin bonded bridges

Answer 15

• Extensive past restoration
• Heavy occlusal load - bruxing
• Limited bonding surface
• Poor tooth morphology
• Shape and shade change of the abutment needed

Question 16

Cantilever designed RBBs have a 5 year survival rate of:

Answer 16

91%

Question 17

Resistance form in crown preparations:

a) Improved by increased taper
b) Is not as important as the type of cement used for stability
c) Does not relate to the height of the crown
d) Can be improved with additions to the prep such as mesial and distal grooves
e) Is the ability to withstand vertical dislodging forces

Answer 17

d) Can be improved with additions to the prep such as mesial and distal grooves

Question 19

For an unbonded restoration, a prep height of at least mm is needed.

Answer 19

3mm

Question 20

How much reduction is needed for ceramic onlay?

Answer 20

• 1.5mm occlusal
• 1mm axial
• 0.2mm cement thickness

Question 21

5 indications for zirconia:

Answer 21

• Limited occlusal space
• Covering dark discolouration
• Isolation for reliable bonding is too dificult

Question 22

3 benefits of good bond strength:

Answer 22

• Low sensitivity
• Less recurrant caries
• Less staining

Question 24

10 year survival of veneers when bonded to enamel is:

Answer 24

91%

Question 25

In what situation would you prep a veneer to slightly beyond the contact point?

Answer 25

Closing a diastema.

otherwise keep in front of contact so tooth is stable whilst veneer is made.

Question 26

Prep for porcelain veneers should be how thick?

Answer 26

0.3 to 0.5mm