Question 1

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 D

Question 2

What type of impression tray is required with reversible hydrocolloid impressions?

Accepted Answer

A) Perforated 
B) Disposable 
C) Water-cooled 
D) Plastic 
A) Perforated 
B) Disposable 
C) Water-cooled 
D) Plastic C

Question 3

Most alginate impressions must be poured within _____ so that distortion does not occur.

Accepted Answer

A) 5 minutes 
B) 30 minutes 
C) 1 hour 
D) 24 hours 
A) 5 minutes 
B) 30 minutes 
C) 1 hour 
D) 24 hours C

Question 4

The three classifications of impressions in dentistry are:

Accepted Answer

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

Question 5

Alginate impression material can:

Accepted Answer

A) change color as it sets. 
B) be normal set or fast set. 
C) be supplied with flavoring. 
D) all of the above. 
A) change color as it sets. 
B) be normal set or fast set. 
C) be supplied with flavoring. 
D) all of the above.

Question 6

What positioning should the EFDA use while taking mandibular and maxillary impressions?

Accepted Answer

A) Upright 
B) Operator 
C) Subsupine 
D) Four-handed dentistry 
A) Upright 
B) Operator 
C) Subsupine 
D) Four-handed dentistry

Question 7

How will a water temperature of 80° F (26.6° C) affect an alginate mix?

Accepted Answer

A) It will make the mix set faster. 
B) It will not change the setting time. 
C) It will make the mix set slower. 
D) It will render it useless. 
A) It will make the mix set faster. 
B) It will not change the setting time. 
C) It will make the mix set slower. 
D) It will render it useless.

Question 8

A _____ tray covers half of a dental arch.

Accepted Answer

A) full-arch 
B) section 
C) quadrant 
D) custom 
A) full-arch 
B) section 
C) quadrant 
D) custom

Question 9

Which is not true regarding reversible hydrocolloids?

Accepted Answer

A) Plastic stops are used during the impression. 
B) The impression procedure requires the use of 3 conditioning baths for the material. 
C) The material is 85% agar and 15% water. 
D) Either tray or syringe material can be used for the impression. 
A) Plastic stops are used during the impression. 
B) The impression procedure requires the use of 3 conditioning baths for the material. 
C) The material is 85% agar and 15% water. 
D) Either tray or syringe material can be used for the impression.

Question 10

Which of the following is not considered a classification of impression materials?

Accepted Answer

A) Preliminary 
B) Final 
C) Temporary 
D) Occlusal 
A) Preliminary 
B) Final 
C) Temporary 
D) Occlusal

Question 11

What may be done to alleviate the gag reflex when taking alginate impressions?

Accepted Answer

A) Use fast-set alginate, as it allows the impression tray to be removed from the mouth much sooner than if using normal set alginate. 
B) Do not overload the posterior regions of the trays. 
C) Have the patient take deep breaths through the nose. 
D) All of the above may be done. 
A) Use fast-set alginate, as it allows the impression tray to be removed from the mouth much sooner than if using normal set alginate. 
B) Do not overload the posterior regions of the trays. 
C) Have the patient take deep breaths through the nose. 
D) All of the above may be done.

Question 12

Elastomeric materials use an automix system; what does the extruder gun consist of?

Accepted Answer

A) A tube of catalyst and base of the same viscosity 
B) A tube of light- and heavy-body material 
C) Either of the above 
D) Neither of the above 
A) A tube of catalyst and base of the same viscosity 
B) A tube of light- and heavy-body material 
C) Either of the above 
D) Neither of the above

Question 13

The length or depth of the alginate impression tray borders can be extended by adding _____ to the tray.

Accepted Answer

A) utility wax 
B) acrylic 
C) boxing wax 
D) border molding compound 
A) utility wax 
B) acrylic 
C) boxing wax 
D) border molding compound

Question 14

When taking a wax bite registration,the patient is directed to:

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 15

Impression trays must be rigid enough to:

Accepted Answer

A) support the material in the patient's mouth. 
B) warp the completed impression. 
C) both a and b. 
D) neither of the above. 
A) support the material in the patient's mouth. 
B) warp the completed impression. 
C) both a and b. 
D) neither of the above.

Question 16

Alginate material not setting or setting too rapidly may be the result of:

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 17

One of the most popular impression materials used for bite registration is:

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 18

Custom impression trays:

Accepted Answer

A) are made from a preliminary model after the dentist has prepared the teeth. 
B) may be constructed from resin. 
C) are available only as full-arch trays. 
D) do not require adhesive if they are smooth surface. 
A) are made from a preliminary model after the dentist has prepared the teeth. 
B) may be constructed from resin. 
C) are available only as full-arch trays. 
D) do not require adhesive if they are smooth surface.

Question 19

Final impressions are taken by the:

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

When loading a tray for an upper impression,place:

Accepted Answer

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

Exam 46: Impression Materials

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

What type of impression tray is required with reversible hydrocolloid impressions?

Most alginate impressions must be poured within _____ so that distortion does not occur.

The three classifications of impressions in dentistry are:

Alginate impression material can:

What positioning should the EFDA use while taking mandibular and maxillary impressions?

How will a water temperature of 80° F (26.6° C) affect an alginate mix?

A _____ tray covers half of a dental arch.

Which is not true regarding reversible hydrocolloids?

Which of the following is not considered a classification of impression materials?

What may be done to alleviate the gag reflex when taking alginate impressions?

Elastomeric materials use an automix system; what does the extruder gun consist of?

The length or depth of the alginate impression tray borders can be extended by adding _____ to the tray.

When taking a wax bite registration,the patient is directed to:

Impression trays must be rigid enough to:

Alginate material not setting or setting too rapidly may be the result of:

One of the most popular impression materials used for bite registration is:

Custom impression trays:

Final impressions are taken by the:

When loading a tray for an upper impression,place:

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

Dental Caries

Periodontal Disease

Preventive Dentistry

Nutrition

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Disease Transmission and Infection Prevention

Principles and Techniques of Disinfection

Principles and Techniques of Instrument Processing and Sterilization

Regulatory and Advisory Agencies

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Foundations of Radiography, Radiographic Equipment, and Radiation Safety

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