Lab Procedures in Fixed Prosthodontics

die

a .... must be used to pour crown and bridge final impressions

gypsum

dental stones are ... based

1

what type of dental stone:

- impression plaster

2

what type of dental stone:

- model plaster (mounting)

3

what type of dental stone:

- model stone

- diagnostic casts,

- ortho models,

- master casts for complete dentures,

- opposing casts in C&B

4

what type of dental stone:

- high strength (die) stone

5

what type of dental stone:

- high-strength high-expansion (die) stone

hydration

the Setting reaction of dental stones results from ...... of calcium sulfate hemihydrate:

vacumix

A ..... machine, which mixes stone under a vacuum (to remove air bubbles) must also be used when pouring the die stone for crown and bridge models

exact powder:water ratio; perfectly clean

when using the vacumix it is crucial to use the ..... and for the bowl and lid to be .....

master cast

...... must:

- Be an exact reproduction of both prepared and unprepared tooth surfaces

- Free of voids and bubbles

- Also contain all relevant soft tissues including all edentulous spaces and residual ridges

no

can you rely on stone color for identifying what type of stone it is

u

both maxillary and mandibular master casts are trimmed into a .... shape

pindexed; dies

A ..... master cast which contains ... of tooth preparations are used to develop restoration contour, occlusion, and interproximal contacts while maintaining access to margins on all sides of the prep

.5-1

the die should have Remaining tooth structure immediately cervical to the finish line easily discernable, ideally with ......mm visible tooth structure

below

when trimming the dies:

- The area ..... the crown margin is used to help contour the wax pattern that will be fabricated.

die spacer; .5

...... is painted in a uniform thickness over the die which provides room for the cement upon cementation.

it should stop ....mm short of the margin

lost wax

the .... technique is used for:

- Full gold crowns

- Metal copings for PFMs

- Pressed glass or pressed particle-filled ceramics

- Co-Cr RPD frameworks