Question 1

Which is NOT used for pouring diagnostic casts?

Accepted Answer

A)  Model plaster 
B)  Dental stone 
C)  Acrylic resin 
D)  High-strength stone 
A)  Model plaster 
B)  Dental stone 
C)  Acrylic resin 
D)  High-strength stone C

Question 2

The bite registration establishes the proper centric relationship when fabricating a permanent crown.

Accepted Answer

A) True 
 B)False  True

Question 3

Which statement is true?

Accepted Answer

A)  Model plaster is stronger than dental stone. 
B)  Dental stone is used when dimensional accuracy is not critical. 
C)  High-strength stone is a form of gypsum. 
D)  All gypsum products have the same powder-to-water ratio. 
A)  Model plaster is stronger than dental stone. 
B)  Dental stone is used when dimensional accuracy is not critical. 
C)  High-strength stone is a form of gypsum. 
D)  All gypsum products have the same powder-to-water ratio. C

Question 4

A custom impression tray is made from:

Accepted Answer

A)  resin 
B)  plastic 
C)  metal 
D)  gauze 
A)  resin 
B)  plastic 
C)  metal 
D)  gauze

Question 5

The anterior portion of a trimmed maxillary model will be:

Accepted Answer

A)  pointed 
B)  rounded 
C)  squared 
D)  beveled 
A)  pointed 
B)  rounded 
C)  squared 
D)  beveled

Question 6

After taking an alginate impression, the cast should be fabricated within:

Accepted Answer

A)  15 minutes 
B)  30 minutes 
C)  1 hour 
D)  24 hours 
A)  15 minutes 
B)  30 minutes 
C)  1 hour 
D)  24 hours

Question 7

The irreversible hydrocolloid material used most extensively for preliminary impressions is:

Accepted Answer

A)  light-bodied material 
B)  alginate 
C)  polysulfide 
D)  polyether 
A)  light-bodied material 
B)  alginate 
C)  polysulfide 
D)  polyether

Question 8

A preliminary impression is used to fabricate:

Accepted Answer

A)  custom trays 
B)  indirect restorations 
C)  partial or full dentures 
D)  implants 
A)  custom trays 
B)  indirect restorations 
C)  partial or full dentures 
D)  implants

Question 9

When loading a tray for an upper impression, place:

Accepted Answer

A)  more material toward the anterior and labial edges 
B)  more material in the palatal area 
C)  the material evenly in the tray 
D)  more material toward the posterior and palatal areas 
A)  more material toward the anterior and labial edges 
B)  more material in the palatal area 
C)  the material evenly in the tray 
D)  more material toward the posterior and palatal areas

Question 10

The three classifications of impressions in dentistry are:

Accepted Answer

A)  prospective, retrospective, and introspective registrations 
B)  preliminary, functional, and occlusal, or bite, registrations 
C)  preliminary, final, and occlusal, or bite, registrations 
D)  diagnostic, functional, and determinative registrations 
A)  prospective, retrospective, and introspective registrations 
B)  preliminary, functional, and occlusal, or bite, registrations 
C)  preliminary, final, and occlusal, or bite, registrations 
D)  diagnostic, functional, and determinative registrations

Question 11

Dentists prefer to use plaster for diagnostic casts, due to its strength and long shelf life.

Accepted Answer

A) True 
 B)False

Question 12

Which material is elastic and reversible?

Accepted Answer

A)  Zinc oxide eugenol impression paste 
B)  Agar 
C)  Alginate 
D)  Impression compounds 
A)  Zinc oxide eugenol impression paste 
B)  Agar 
C)  Alginate 
D)  Impression compounds

Question 13

Alginate impressions are removed from the mouth by:

Accepted Answer

A)  using a gentle rocking movement 
B)  using one quick, snap-out motion 
C)  twisting the tray sideways 
D)  using a vigorous back-and-forth action 
A)  using a gentle rocking movement 
B)  using one quick, snap-out motion 
C)  twisting the tray sideways 
D)  using a vigorous back-and-forth action

Question 14

Which slows the set of a gypsum cast?

Accepted Answer

A)  Using model plaster instead of dental stone 
B)  Adding a little extra powder to the mix 
C)  Using warm water in the mix 
D)  Mixing gently for a short period of time 
A)  Using model plaster instead of dental stone 
B)  Adding a little extra powder to the mix 
C)  Using warm water in the mix 
D)  Mixing gently for a short period of time

Question 15

Heavy-body material is the thickest of the three elastomeric impression materials.

Accepted Answer

A) True 
 B)False

Question 16

Which forms the art portion of the cast?

Accepted Answer

A)  Teeth 
B)  Oral mucosa 
C)  Muscle attachments 
D)  Base 
A)  Teeth 
B)  Oral mucosa 
C)  Muscle attachments 
D)  Base

Question 17

An impression is a negative reproduction. A cast is a positive reproduction.

Accepted Answer

A)  Both statements are true. 
B)  Both statements are false. 
C)  The first statement is true; the second is false. 
D)  The first statement is false; the second is true. 
A)  Both statements are true. 
B)  Both statements are false. 
C)  The first statement is true; the second is false. 
D)  The first statement is false; the second is true.

Question 18

Bite registration paste is applied with which tray?

Accepted Answer

A)  Perforated 
B)  Gauze 
C)  Plastic sooth 
D)  Water coolant 
A)  Perforated 
B)  Gauze 
C)  Plastic sooth 
D)  Water coolant

Question 19

Which impression tray covers half of a dental arch?

Accepted Answer

A)  Full 
B)  Section 
C)  Quadrant 
D)  Custom 
A)  Full 
B)  Section 
C)  Quadrant 
D)  Custom

Question 20

An extruder gun is used for which impression mix?

Accepted Answer

A)  Automix system 
B)  Paste system 
C)  Putty impression material 
D)  Tabletop mixing unit 
A)  Automix system 
B)  Paste system 
C)  Putty impression material 
D)  Tabletop mixing unit

Exam 22: Impression Materials and Laboratory Procedures

Which is NOT used for pouring diagnostic casts?

The bite registration establishes the proper centric relationship when fabricating a permanent crown.

Which statement is true?

A custom impression tray is made from:

The anterior portion of a trimmed maxillary model will be:

After taking an alginate impression, the cast should be fabricated within:

The irreversible hydrocolloid material used most extensively for preliminary impressions is:

A preliminary impression is used to fabricate:

When loading a tray for an upper impression, place:

The three classifications of impressions in dentistry are:

Dentists prefer to use plaster for diagnostic casts, due to its strength and long shelf life.

Which material is elastic and reversible?

Alginate impressions are removed from the mouth by:

Which slows the set of a gypsum cast?

Heavy-body material is the thickest of the three elastomeric impression materials.

Which forms the art portion of the cast?

An impression is a negative reproduction. A cast is a positive reproduction.

Bite registration paste is applied with which tray?

Which impression tray covers half of a dental arch?

An extruder gun is used for which impression mix?

Introduction to Dental Assisting

Professional and Legal Aspects of Dental Assisting

Anatomy and Physiology

Dental Anatomy

Disease Transmission

Infection Control and Management of Hazardous Materials

Surface Disinfection and Treatment Room Preparation

Instrument Processing

Clinical Dentistry

Moisture Control

The Dental Patient

The Dental Examination

Medical Emergencies in the Dental Office

Pain and Anxiety Control

Radiation Safety and Production of X-Rays

Oral Radiography

Preventive Care

Coronal Polishing and Dental Sealants

Instruments, Handpieces, and Accessories

Restorative and Esthetic Dental Materials

Restorative Procedures

Prosthodontics and Dental Implants

Periodontics

Endodontics

Oral and Maxillofacial Surgery

Pediatric Dentistry

Orthodontics

The Job Search

Filters