Question 1

How are alginate impressions removed from the mouth?

Accepted Answer

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

Question 2

Why would a dentist request preliminary impressions?

Accepted Answer

A) To fabricate custom trays 
B) To create a working model for indirect restoration 
C) To wax up for partial or full dentures 
D) To construct implant crowns 
A) To fabricate custom trays 
B) To create a working model for indirect restoration 
C) To wax up for partial or full dentures 
D) To construct implant crowns A

Question 3

Which statement is true regarding alginate impression material?

Accepted Answer

A) It changes color as it sets. 
B) It can be normal set or fast set. 
C) It can be supplied with flavoring. 
D) All of the above are possible traits. 
A) It changes color as it sets. 
B) It can be normal set or fast set. 
C) It can be supplied with flavoring. 
D) All of the above are possible traits. D

Question 4

Why would utility wax be placed on a maxillary impression tray?

Accepted Answer

A) Maximize anatomic coverage of the posterior teeth. 
B) Modify the trays to accommodate a high palate. 
C) Permanently alter the impression tray. 
D) Both a and b are correct 
E) All of the above are correct. 
A) Maximize anatomic coverage of the posterior teeth. 
B) Modify the trays to accommodate a high palate. 
C) Permanently alter the impression tray. 
D) Both a and b are correct 
E) All of the above are correct.

Question 5

What term is used when an alginate impression takes up water either from soaking or wrapping in a wet paper towel?

Accepted Answer

A) Syneresis 
B) Imbibition 
C) Tempering 
D) Viscosity 
A) Syneresis 
B) Imbibition 
C) Tempering 
D) Viscosity

Question 6

Which material is commonly used when taking a bite registration?

Accepted Answer

A) Alginate 
B) Polysiloxane 
C) Polysulfide 
D) None of the above 
A) Alginate 
B) Polysiloxane 
C) Polysulfide 
D) None of the above

Question 7

Which of the four types of elastomeric materials has the best dimensional stability?

Accepted Answer

A) Polysulfide 
B) Polyether 
C) Condensation silicone 
D) Polysiloxane 
A) Polysulfide 
B) Polyether 
C) Condensation silicone 
D) Polysiloxane

Question 8

Which type of impression is taken to produce a reproduction of the occlusal relationship of the maxilla and mandible teeth when in centric occlusion?

Accepted Answer

A) Final 
B) Preliminary 
C) Bite registration 
D) Articulated 
A) Final 
B) Preliminary 
C) Bite registration 
D) Articulated

Question 9

Alginate material that is not setting or setting too rapidly can be the result of which factor?

Accepted Answer

A) Expired shelf life 
B) Humidity 
C) Improper storage 
D) All of the above 
A) Expired shelf life 
B) Humidity 
C) Improper storage 
D) All of the above

Question 10

Which statement is an advantage of an Automix unit system for impressions?

Accepted Answer

A) No mixing saves materials. 
B) It increases productivity. 
C) Less time is spent on infection control. 
D) All of these are advantages. 
A) No mixing saves materials. 
B) It increases productivity. 
C) Less time is spent on infection control. 
D) All of these are advantages.

Question 11

Which instructions would be given to a patient obtaining a bite registration?

Accepted Answer

A) Bite with the posterior teeth first. 
B) Close normally and gently. 
C) Occlude with lateral movements. 
D) Bite with the anterior teeth first. 
A) Bite with the posterior teeth first. 
B) Close normally and gently. 
C) Occlude with lateral movements. 
D) Bite with the anterior teeth first.

Question 12

What is the purpose of the potassium alginate in impression alginate?

Accepted Answer

A) It slows set time. 
B) It adds bulk to the material. 
C) It accelerates set time. 
D) It thickens the material. 
A) It slows set time. 
B) It adds bulk to the material. 
C) It accelerates set time. 
D) It thickens the material.

Question 13

Which material is the most durable for occlusal bite registrations?

Accepted Answer

A) Softened baseplate wax 
B) Polysiloxane 
C) Zinc oxide-eugenol (ZO
E)  
D) Polyether impression material 
A) Softened baseplate wax 
B) Polysiloxane 
C) Zinc oxide-eugenol (ZO
E)  
D) Polyether impression material

Question 14

How is the impression tray prepared for an elastomeric impression?

Accepted Answer

A) Stops placed 
B) Spacers placed 
C) Coated with adhesive 
D) Treated with lubricant 
A) Stops placed 
B) Spacers placed 
C) Coated with adhesive 
D) Treated with lubricant

Question 15

Which portion of the maxillary impression tray should be seated in the mouth first?

Accepted Answer

A) Anterior 
B) Posterior 
C) Right side 
D) Left side 
A) Anterior 
B) Posterior 
C) Right side 
D) Left side

Question 16

Which of the following is an acceptable method for altering the setting time of alginate irreversible hydrocolloid impression material?

Accepted Answer

A) Increase or decrease the water-to-powder ratio. 
B) Change the water temperature. 
C) Add a colloidal material to the alginate. 
D) Use potassium chloride as an accelerator. 
A) Increase or decrease the water-to-powder ratio. 
B) Change the water temperature. 
C) Add a colloidal material to the alginate. 
D) Use potassium chloride as an accelerator.

Question 17

How should alginate material be loaded into a maxillary impression tray?

Accepted Answer

A) Heavier in the anterior and labial areas 
B) Heavier in the palatal area 
C) Evenly in the tray 
D) Heavier toward the posterior 
A) Heavier in the anterior and labial areas 
B) Heavier in the palatal area 
C) Evenly in the tray 
D) Heavier toward the posterior

Question 18

The retromolar area,lingual frenum,tongue space,and mylohyoid ridge are reproduced in a mandibular impression.The median raphe,palate,and incisive papilla are reproduced in a maxillary impression.

Accepted Answer

A) Both statements are correct. 
B) Neither statement is correct. 
C) The first statement is correct; the second statement is incorrect. 
D) The first statement is incorrect; the second statement is correct. 
A) Both statements are correct. 
B) Neither statement is correct. 
C) The first statement is correct; the second statement is incorrect. 
D) The first statement is incorrect; the second statement is correct.

Question 19

Legally,who can take final impressions?

Accepted Answer

A) Dentist 
B) Dental hygienist 
C) Dental assistant 
D) Laboratory technician 
A) Dentist 
B) Dental hygienist 
C) Dental assistant 
D) Laboratory technician

Question 20

Which listed criteria would not be acceptable on an alginate impression?

Accepted Answer

A) Free of voids, air bubbles, and tears 
B) Anatomic areas clearly defined 
C) Peripheral borders clearly defined 
D) Void of frena and tuberosities 
A) Free of voids, air bubbles, and tears 
B) Anatomic areas clearly defined 
C) Peripheral borders clearly defined 
D) Void of frena and tuberosities

Exam 46: Impression Materials

How are alginate impressions removed from the mouth?

Why would a dentist request preliminary impressions?

Which statement is true regarding alginate impression material?

Why would utility wax be placed on a maxillary impression tray?

What term is used when an alginate impression takes up water either from soaking or wrapping in a wet paper towel?

Which material is commonly used when taking a bite registration?

Which of the four types of elastomeric materials has the best dimensional stability?

Which type of impression is taken to produce a reproduction of the occlusal relationship of the maxilla and mandible teeth when in centric occlusion?

Alginate material that is not setting or setting too rapidly can be the result of which factor?

Which statement is an advantage of an Automix unit system for impressions?

Which instructions would be given to a patient obtaining a bite registration?

What is the purpose of the potassium alginate in impression alginate?

Which material is the most durable for occlusal bite registrations?

How is the impression tray prepared for an elastomeric impression?

Which portion of the maxillary impression tray should be seated in the mouth first?

Which of the following is an acceptable method for altering the setting time of alginate irreversible hydrocolloid impression material?

How should alginate material be loaded into a maxillary impression tray?

The retromolar area,lingual frenum,tongue space,and mylohyoid ridge are reproduced in a mandibular impression.The median raphe,palate,and incisive papilla are reproduced in a maxillary impression.

Legally,who can take final impressions?

Which listed criteria would not be acceptable on an alginate impression?

History of Dentistry

The Professional Dental Assistant

The Dental Healthcare Team

Dental Ethics

Dentistry and the Law

General Anatomy

General Physiology

Oral Embryology and Histology

Head and Neck Anatomy

Landmarks of the Face and Oral Cavity

Overview of the Dentitions

Tooth Morphology

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