Mod E, Unit 2 Exam

Front 1

What is the advantage of more equipment and expertise in the official dental laboratory?

Back 1

B. The dentist or private laboratory technician can handle larger cases.

Front 2

The ___ is used to polish or trim custom trays, provisional coverage, dentures, and indirect restorations.

Back 2

D. dental lathe.

Front 3

Which form of gypsum products is used for the creation of dies?

Back 3

D. high-strength stone

Front 4

Which of the following gypsum products has the highest powder-to- water ratio?

Back 4

A. model plaster

Front 5

A trimmed maxillary model will be ____ at the anterior portion, and the mandibular model will be ___ at the anterior portion.

Back 5

A. pointed; rounded

Front 6

When constructing ____ with a vacuum former, you will use a heavier-gauge, flexible plastic that does not require a spacer but does require an attachment for the strap.

Back 6

D. mouth guard

Front 7

The dental wax that is used for recording rims and for denture wax-ups and that is supplied in sheets is called ____wax.

Back 7

B. baseplate

Front 8

____wax is pre-formed with a thin sheet of aluminum foil between the layers.

Back 8

D. bite registration

Front 9

infection control in the dental laboratory is:

Back 9

A. as important as it is when you are with a patient.

Front 10

Safety precautions in the laboratory include all except:

Back 10

C. this is the appropriate place for eating and drinking in the dental office.

Front 11

Which are methods used to protect against biohazard contamination from impressions?

Back 11

D. all are methods that can reduce contamination form impressions

Front 12

Water should be running through a model trimmer:

Back 12

B. at all times when trimming

Front 13

The ____ is the measurement of where the teeth are positioned when the joints are aligned correctly and before the teeth actually come together.

Back 13

D. both a and c ( bite record and centric relation)

Front 14

When mixing gypsum, it is important to use the correct amount of water and powder. If additional powder is added after mixing has begun, the mix will be:

Back 14

B. weaker

Front 15

The powder-to-water ratio for high-strength stone is ___:100

Back 15

C. 19

Front 16

A custom impression tray should fit and adapt well to the model and should maintain __ mm of impression material between itself and the teeth.

Back 16

C. 3 to 4

Front 17

The purpose of ___ is to prevent a custom impression tray from sitting too deeply when taking the impression.

Back 17

B. stops

Front 18

What is a light gauge of vacuum0formed resin material used for?

Back 18

D. Both a and b ( bleaching trays and provisional coverage)

Front 19

Light-cured resin can be used to make trays for ___ impressions.

Back 19

D. all types of impressions

Front 20

A dental assistant should wait ___ minutes before removing a model from an impression.

Back 20

D. 45 to 60

Front 21

When preparing impressions for pouring, it is important to:

Back 21

B. use a gentle stream of air to remove excess moisture.

Front 22

how should light-cured resin tray material be cured?

Back 22

C. for 2 minutes

Front 23

Before constructing a light-cured tray, paint the model with a(n):

Back 23

D. separator

Front 24

What device holds maxillary and mandibular models in an occlusal relationship?

Back 24

D. Articulator

Front 25

true/false:

When constructing custom trays it is best to remove excess material with a lab knife after it has cured.

Back 25

A. True