Question 1

If a more durable impression material is needed for bite registration,_____ may be selected.

Accepted Answer

A) polysulfide 
B) zinc oxide-eugenol (ZO
E)  
C) polysiloxane 
D) reversible hydrocolloid 
A) polysulfide 
B) zinc oxide-eugenol (ZO
E)  
C) polysiloxane 
D) reversible hydrocolloid

Question 2

Criteria for an acceptable alginate impression include all of the following except:

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.

Question 3

Which type of elastomeric material has the highest viscosity?

Accepted Answer

A) Light-bodied 
B) Regular-bodied 
C) Heavy-bodied 
D) Putty 
A) Light-bodied 
B) Regular-bodied 
C) Heavy-bodied 
D) Putty

Question 4

The retromolar area,lingual frenum,tongue space,and mylohyoid ridge are reproduced in which impression?

Accepted Answer

A) Maxillary 
B) Mandibular 
C) Both a and b 
D) Neither a nor b 
A) Maxillary 
B) Mandibular 
C) Both a and b 
D) Neither a nor b

Question 5

Preliminary impressions are used to make:

Accepted Answer

A) diagnostic models. 
B) provisional coverage. 
C) orthodontic appliances. 
D) all of the above. 
A) diagnostic models. 
B) provisional coverage. 
C) orthodontic appliances. 
D) all of the above.

Question 6

Alginate impressions may be disinfected by:

Accepted Answer

A) spraying the alginate with glutaraldehyde. 
B) submersion in disinfecting solution overnight. 
C) wetting with isopropyl alcohol. 
D) spraying the alginate with an intermediate-level disinfectant. 
A) spraying the alginate with glutaraldehyde. 
B) submersion in disinfecting solution overnight. 
C) wetting with isopropyl alcohol. 
D) spraying the alginate with an intermediate-level disinfectant.

Question 7

Which type of reversible hydrocolloid material is the most viscous?

Accepted Answer

A) Syringe 
B) Plate 
C) Hysteretic 
D) Tray 
A) Syringe 
B) Plate 
C) Hysteretic 
D) Tray

Question 8

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

Accepted Answer

A) Slow set time. 
B) Add bulk to material. 
C) Accelerate set time. 
D) Thicken the material. 
A) Slow set time. 
B) Add bulk to material. 
C) Accelerate set time. 
D) Thicken the material.

Question 9

Elastomeric impression materials are mixed by using:

Accepted Answer

A) a paper pad and spatula. 
B) an automix system. 
C) mixing bowl and a spatula. 
D) both a and b. 
A) a paper pad and spatula. 
B) an automix system. 
C) mixing bowl and a spatula. 
D) both a and b.

Question 10

Which 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

Although technique may vary,when assisting a dentist in taking an elastomeric impression,mix the light-bodied material first.

Accepted Answer

A) True 
 B)False

Question 12

A(n) _____ impression material is used when an extremely accurate final impression is essential.

Accepted Answer

A) elastomeric 
B) alginate 
C) reversible hydrocolloid 
D) light-cured 
A) elastomeric 
B) alginate 
C) reversible hydrocolloid 
D) light-cured

Question 13

Putting utility/rope wax on maxillary alginate trays will:

Accepted Answer

A) maximize anatomical coverage of the posterior teeth. 
B) modify the trays to accommodate a high palate. 
C) permanently alter the impression tray. 
D) a and b only. 
E) all of the above. 
A) maximize anatomical coverage of the posterior teeth. 
B) modify the trays to accommodate a high palate. 
C) permanently alter the impression tray. 
D) a and b only. 
E) all of the above.

Question 14

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 15

Impression inspection and evaluation include:

Accepted Answer

A) the presence of the retromolar area and maxillary tuberosity. 
B) sharp anatomical detail. 
C) a surface free from voids. 
D) all of the above. 
A) the presence of the retromolar area and maxillary tuberosity. 
B) sharp anatomical detail. 
C) a surface free from voids. 
D) all of the above.

Question 16

Syneresis in an alginate impression occurs when:

Accepted Answer

A) water evaporates from the impression. 
B) the mix changes colors. 
C) excess moisture is absorbed by the impression. 
D) the mixing time is increased. 
A) water evaporates from the impression. 
B) the mix changes colors. 
C) excess moisture is absorbed by the impression. 
D) the mixing time is increased.

Question 17

An impression is a _____ reproduction of teeth and surrounding oral tissues,and the model created from the impression is a _____ reproduction of the structures.

Accepted Answer

A) positive; positive 
B) positive; negative 
C) negative; positive 
D) negative; negative 
A) positive; positive 
B) positive; negative 
C) negative; positive 
D) negative; negative

Question 18

Most of the elastomeric material used requires the use of a(n) _____ on the tray.

Accepted Answer

A) stop 
B) spacer 
C) adhesive 
D) lubricant 
A) stop 
B) spacer 
C) adhesive 
D) lubricant

Question 19

Which of the following is the most durable material for occlusal bite registration?

Accepted Answer

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

Question 20

If an alginate impression is stored in water or in a soaked paper towel,the alginate will absorb the additional water and expand.This property is called:

Accepted Answer

A) syneresis. 
B) imbibition. 
C) tempering. 
D) viscosity. 
A) syneresis. 
B) imbibition. 
C) tempering. 
D) viscosity.

Exam 46: Impression Materials

If a more durable impression material is needed for bite registration,_____ may be selected.

Criteria for an acceptable alginate impression include all of the following except:

Which type of elastomeric material has the highest viscosity?

The retromolar area,lingual frenum,tongue space,and mylohyoid ridge are reproduced in which impression?

Preliminary impressions are used to make:

Alginate impressions may be disinfected by:

Which type of reversible hydrocolloid material is the most viscous?

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

Elastomeric impression materials are mixed by using:

Which is an advantage of an automix unit system for impressions?

Although technique may vary,when assisting a dentist in taking an elastomeric impression,mix the light-bodied material first.

A(n) _____ impression material is used when an extremely accurate final impression is essential.

Putting utility/rope wax on maxillary alginate trays will:

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

Impression inspection and evaluation include:

Syneresis in an alginate impression occurs when:

An impression is a _____ reproduction of teeth and surrounding oral tissues,and the model created from the impression is a _____ reproduction of the structures.

Most of the elastomeric material used requires the use of a(n) _____ on the tray.

Which of the following is the most durable material for occlusal bite registration?

If an alginate impression is stored in water or in a soaked paper towel,the alginate will absorb the additional water and expand.This property is called:

History of Dentistry

The Professional Dental Assistant

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Dental Ethics

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General Anatomy

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Overview of the Dentitions

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An impression is a _ reproduction of teeth and surrounding oral tissues,and the model created from the impression is a _ reproduction of the structures.