FABRICATION OF THE METAL FRAMEWORK

Question 1

DESIGN TRANSFER

Answer 1

transfer design of metal framework to master cast
-surveying table (align tripod marks)
-mark retentive undercuts

Question 2

blockout relief (2)

Answer 2

casts are blocked out to eliminate undercut areas that will be crossed by the rigid parts of the rpd
-remember: all parts of the framework are non flexible except for the clasp tips

Question 3

arbitrary blockout in less critical areas (4)

Answer 3

1. gingival crevices
2. spaces between teeth not in the design
3. gross tissue undercuts
4. areas that would complicate the duplication process

Question 4

relief
(2)

Answer 4

1. space between the framework and cast/soft tissue
2. beneath framework extension in edentulous areas

Question 5

2. beneath framework extension in edentulous areas
   (2)

Answer 5

-provide attachment of the denture base
-form internal finish line

Question 6

prepared master casts are duplicated to produce an

Answer 6

exact copy of master cast in investment material (refractory cast)

Question 7

framework pattern will be fabricated on the

Answer 7

refractory cast using wax

Question 8

an impression using reversible hydrocolloid (agar) is made of the

Answer 8

wax pattern on the refractory cast

Question 9

other materials that can be used:

Answer 9

alginate
reversible plastic gel (polyvinyl chloride)

Question 10

Reversible hydrocolloid which has been
warmed, is poured and it flows into the

Answer 10

duplication flask.

Question 11

Investment material is used to make the

Answer 11

refractory cast

Question 12

Paint-on layer of investment
(—mm)

Answer 12

3 to 4