DA 250 Chapter 47

Question 1

When constructing custom trays, it is best to remove excess material with a lab knife after cur

Accepted Answer

false

Question 2

Which gypsum product has the highest powder to water ratio?

Accepted Answer

Model plaster

Question 3

What technique would be incorrect when pouring

Accepted Answer

large amounts

Question 4

Which is incorrect pertaining to lab safety

Accepted Answer

Can eat or drink in lab

Question 5

First step in making a custom tray

Accepted Answer

prepare a diagnostic model

Question 6

Which pour method consists of pouring a large mixture of stone and pouring everything in 1 step

Accepted Answer

inverted pour

Question 7

What device holds the max and mand models in occlusal relationship?

Accepted Answer

articulator

Question 8

How should the pt bite when positioning the bite-fork during face-bow registration

Accepted Answer

slowly

Question 9

Water should be running through a model trimmer:

Accepted Answer

when trimming

Question 10

Which is correct pertaining to infection control in lab

Accepted Answer

Equally important as when you are with a pt

Question 11

Maxillary model is trimmed __ in the anterior. Mandibular is trimmed __ in the anterior

Accepted Answer

Pointed, rounded

Question 12

Before constructing a light-cured tray, what should be painted on model?

Accepted Answer

separation medium

Question 13

which portion of model has the teeth and tissues

Accepted Answer

Anatomical

Question 14

Which material is formed into a diagnostic model using heat and vacuum former

Accepted Answer

Thermoplastic

Question 15

How will gypsum be affected if additional powder is added after mixing has begun

Accepted Answer

weaker

Question 16

What causes air bubbles in model?

Accepted Answer

improper pouring of the impression

Question 17

Which portion of the model is the base?

Accepted Answer

Art

Question 18

What is used to polish or trim custom trays, temps, dentures and indirect restorations?

Accepted Answer

Dental lathe

Question 19

Which type of baseplate wax is softer and used for denture construction?

Accepted Answer

I

Question 20

Which form of gypsum is used in creation of dies

Accepted Answer

High-strength stone

Question 21

When constructing __ w/ a vacuum former, use heavier gauge, plastic that doesn't require spacer

Accepted Answer

mouthguard

Question 22

What is the advantage of having a lab on site and trained lab personnel on site

Accepted Answer

The dentist or private lab tech can handle larger cases

Question 23

How should a plaster mix not be manipulated

Accepted Answer

complete mix in 30 seconds

Question 24

How much space between impression material and the teeth is ideal?

Accepted Answer

3-4mm

Question 25

Light cured resin can be used to make trays for which type of impresions

Accepted Answer

all types

Question 26

Which type of dental wax is used to construct occlusal rims and set denture teeth in wax-up?

Accepted Answer

Baseplate

Question 27

Which type of wax is preformed w/ a thin sheet of aluminum foil between layers

Accepted Answer

bite registration

Question 28

Powder to water ratio for high strength stone

Accepted Answer

100:19

Question 29

How long should you wait before removing impression from poured up model

Accepted Answer

45-60 min

Question 30

What is used to prevent a custom tray impression from seating too deeply

Accepted Answer

Spacer

DA 250 Chapter 47

Questions 30

DA 250 Chapter 47

Questions 30