Internal characterization

Question 1

Where are internal interferences most common?

Answer 1

Lingual side

Question 2

Shells will shift where?

Answer 2

Towards the interference

Question 3

How do you do a reline?

Answer 3

1) Apply separate media to hard and soft tissue
2) Clean and pretreat the shell provisional with monomer
3) Adapt the loaded shell provisional on to abutments
4) Reline pontic without overflowing the material
5) Careful trimming and brush beading if necessary
6) Check occlusion, contacts
7) Finish and polish

Question 4

Open margin

Answer 4

Vertical space that catches the explorer in both directions

Question 5

Overhang

Answer 5

Horizontal discrepancy

Oversized restoration at the margin so it catches the explorer in coronal direction

Question 6

Submargin (ledge)

Answer 6

Horizontal discrepancy, undersized restoration at the margin so it catches the explorer in apical direction

Question 7

Overcontour

Answer 7

Good margin, but over contoured at the emergence profile

Margin does not catch the explorer

Question 8

Facial embrasures have to be symmetric to…….

Answer 8

contralateral tooth

Question 9

Lingual embrasures can be minimal to assure what?

Answer 9

Sufficient size connector

Question 10

Incisal embrasures have to be symmetric to…….

Answer 10

contralateral tooth

Question 11

Gingival embrasures have to allow what?

Answer 11

Hygiene access without compromising size and esthetics

Question 12

What should be the characteristics of gingival embrasures?

Answer 12

0.5 mm above the margin
0.5 mm above the FGM in clinical setting
Convex toward the gingiva

Question 13

Occlusion

Answer 13

Drag 1 layer of shimstock

Every tooth should have contact

Question 14

Interproximal contact

Answer 14

Draf 2 layers of shimstock

Area contact and not point contact

Question 15

Tissue surface contact

Answer 15

Drag 1 layer of shimstock