Provisional (Kerby)

Question 0

What are the biological characteristics of a provisional?

Answer 0

• seals pulp and cut dentin
• healthy gingiva
• good contact so teeth don’t shift

Question 1

What are the two types of surface forms?

Answer 1

• external surface form

- tissue surface form: prepped tooth.

Question 2

What are the mechanical characteristics of a provisional?

Answer 2

Sufficient strength

Question 3

What are the esthetic characteristics of a provisional?

Answer 3

Looks pretty duh but not too pretty

Question 4

What are the three methods for making provisionals?

Answer 4

• indirect
• direct
• indirect-direct

Question 5

What must one do before taking an impression of prepped tooth?

Answer 5

Pack cord 1mm below gingiva

Question 6

How far should the matrix be trimmed from the gingiva?

Answer 6

4-5mm

Question 7

What must be placed on the tissue form before applying resin?

Answer 7

Alcote layer

Question 8

How long and at what pressure should the cast be placed in the pressure pot?

Answer 8

15 min and 25 psi

Question 9

What color of sand paper disc is the most fine grit?

Answer 9

The lighter the disc the more fine grit

Question 10

At what angle should the acrylic bur be held against the provisional when wiping away flash

Answer 10

At the emergence profile angle

Question 11

What is the order of polishing?

Answer 11

Pumice and then cres shine

Question 12

What are some characteristics of a good provisional?

Answer 12

• visual contact
• convex
• no bubbles or voids
• nice trimmed margin
• high luster
• sealed margin

Question 13

What chemical components make up the provisional?

Answer 13

Jet- polymethylmethacrylate

Provisional resin material

Question 14

Describe the ideal texture of mixed resin material before placed into external surface form?

Answer 14

Creamy and pourable