13. Laboratory Procedures

Question 1

Waxing of the PRDP framework Procedure
 Preformed wax patterns are used in the waxing of the framework.
 Clasp forms – ____ and curved (T, J & I)
 Palatal sheet forms (stippled/textured) for ____
connectors
 Lingual Bar forms (pear-shaped) for ____ connectors
 Lingual Plating forms (pear-shaped) for ____ connectors
 Meshwork for ____ retention
Combination Lingual bar/Meshwork forms
Miscellaneous - Round wax, half round wax, wax sprues, etc.

Answer 1

straight
major
major
major
acrylic resin

Question 2

The occlusal rests are always waxed with ____ wax

Answer 2

blue

Question 3

They are also going to wax into the ____
remember we created the tissue stops in the wax
◦
there is a little hole in the refractory cast ◦
◦
wax needs to be put into the tissue stop area
‣
that is done through the ____ so when the framework is cast
the mesh will not touch tissue but the little tissue stop will
◦
there is no rocking of it
that allows for seating so when the frame work goes for fitting ◦
‣
it touches the tissues on one small spot

Answer 3

tissue stops

mesh

Question 4

we have beading
beading has been cut into this that was done ahead of ____ before this was duplicated and poured in a
refractory material
‣

Answer 4

time

Question 5

The first step is to fill the ____
want the bead to be a positive on that palatal strap
◦ That is filled in first

Answer 5

bead

Question 6

Here is a standard circumferential clasp with
\_\_\_\_ retention
◦
\_\_\_\_ rest ◦
◦
and \_\_\_\_ arm on the lingual

Answer 6

MB
D
reciprocating

Question 7

Confused let’s review who does what.
Final impression –____
Pour master cast –____
Design framework –____ with help from lab
Blockout, bead, fabricate refractory cast and fitting cast – ____
Wax up framework, sprue, invest, cast, fit and polish
framework - ____

Answer 7

dentist
dentist or laboratory
dentist
laboratory
laboratory

Question 8

Now what?
Laboratory returns framework on ____ model
Dentist fits & evaluates framework clinically
Dentist obtains ____ records Dentist selects mould and ____ of teeth
Laboratory ____ case & returns wax try-in
Dentist ____ and evaluates the wax try-in clinically
Case is sent back to laboratory for final ____ processing,
finishing and polishing
____ fits & inserts completed PRDP clinically

Answer 8

master
maxillomandibular
mounts
fits
acrylic
finishing

Question 9

More laboratory procedures
The dental laboratory has returned the wax try-in to the dentist
The dentist and the patient have evaluated the ____ and
final approval is obtained.
The dentist returns the case to the laboratory for…
____ for acrylic processing (____ packed)

Answer 9

investing

hand

Question 10

Investing for acrylic processing (____ molding)

The other way of doing it is to do the injection molding technique make the ____ areas for the acrylic
◦
the Y shape in the mandibular case ◦
◦
the rest of this is blockout, covered over
‣
so that the acrylic flow into here in the injection molding process

Answer 10

injection

spruing