Question 1

Which of the following is true for hydrocolloids in dentistry?

Accepted Answer

A)  Agar hydrocolloid is a reversible hydrocolloid. 
B)  Agar hydrocolloid requires the use of custom impression trays. 
C)  The main clinical use of reversible hydrocolloid is for impressions for diagnostic casts. 
D)  When agar powder is mixed with water,it forms a gluelike suspension that entraps the water,making a colloidal suspension called a gel. 
A)  Agar hydrocolloid is a reversible hydrocolloid. 
B)  Agar hydrocolloid requires the use of custom impression trays. 
C)  The main clinical use of reversible hydrocolloid is for impressions for diagnostic casts. 
D)  When agar powder is mixed with water,it forms a gluelike suspension that entraps the water,making a colloidal suspension called a gel. A

Question 2

What could occur if a cast is made from an improperly disinfected impression?

Accepted Answer

A)  Will not harbor microorganisms 
B)  Should be immersed in solution 
C)  Should be stored for 24 hours first 
D)  Cannot be disinfected,so start over 
A)  Will not harbor microorganisms 
B)  Should be immersed in solution 
C)  Should be stored for 24 hours first 
D)  Cannot be disinfected,so start over C

Question 3

Which characteristic should be considered when choosing an impression tray?

Accepted Answer

A)  Be large enough to fit all oral structures 
B)  Be rigid to support the impression material 
C)  Accurately reproduce vestibules 
D)  All of the above are considered. 
A)  Be large enough to fit all oral structures 
B)  Be rigid to support the impression material 
C)  Accurately reproduce vestibules 
D)  All of the above are considered. D

Question 4

Which of the following impression materials has the smallest dimensional change on setting of all elastomeric and hydrocolloid impression materials?

Accepted Answer

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

Question 5

For a maxillary alginate impression,the operator stands just _____ the patient at the _____ o'clock position and retracts the corner of the mouth with the side of the tray while retracting the other corner of the mouth with the index finger of the other hand.

Accepted Answer

A)  in front of;5 
B)  in front of;7 
C)  behind;1 
D)  behind;11 
A)  in front of;5 
B)  in front of;7 
C)  behind;1 
D)  behind;11

Question 6

_____ gloves should be used when mixing PVS putty.

Accepted Answer

A)  Utility 
B)  Nitrile 
C)  Latex 
D)  Vinyl 
A)  Utility 
B)  Nitrile 
C)  Latex 
D)  Vinyl

Question 7

Match the items with the correct description below.
-Colloid

Accepted Answer

A) An alginate impression material that is mixed to a sol state and as it sets converts to a gel by a chemical reaction that irreversibly changes its nature 
B) Gluelike material composed of two or more substances in which one substance does not go into solution but is suspended within another substance 
C) An agar impression material that can be heated to change from a gel into a fluid state that can flow around the teeth 
D) A water-based colloid used as an elastic impression material 
E) A versatile irreversible hydrocolloid that is the most used impression material in the dental office 
A) An alginate impression material that is mixed to a sol state and as it sets converts to a gel by a chemical reaction that irreversibly changes its nature 
B) Gluelike material composed of two or more substances in which one substance does not go into solution but is suspended within another substance 
C) An agar impression material that can be heated to change from a gel into a fluid state that can flow around the teeth 
D) A water-based colloid used as an elastic impression material 
E) A versatile irreversible hydrocolloid that is the most used impression material in the dental office

Question 8

The completed impression forms a _____ reproduction of the teeth and tissues,and the replica or model forms a _____ replica of the teeth and tissues.

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 9

Of the items listed,which would not be made from an alginate impression?

Accepted Answer

A)  Mouth guard 
B)  Bleaching tray 
C)  Retainer 
D)  Onlay 
A)  Mouth guard 
B)  Bleaching tray 
C)  Retainer 
D)  Onlay

Question 10

What is the ideal time frame for pouring an alginate impression?

Accepted Answer

A)  An hour 
B)  A day 
C)  A week 
D)  A month 
A)  An hour 
B)  A day 
C)  A week 
D)  A month

Question 11

The temperature at which the hydrocolloid liquefies is not the same temperature at which it solidifies.What is this property called?

Accepted Answer

A)  Hysteresis 
B)  Hydrophilic 
C)  Hydrophobic 
D)  Agglutination 
A)  Hysteresis 
B)  Hydrophilic 
C)  Hydrophobic 
D)  Agglutination

Question 12

Mixed alginate should be loaded into the impression tray in _____ increments as _____ as possible.

Accepted Answer

A)  large;quickly 
B)  large;slowly 
C)  small;quickly 
D)  small;slowly 
A)  large;quickly 
B)  large;slowly 
C)  small;quickly 
D)  small;slowly

Question 13

Which of the following is an elastic impression material?

Accepted Answer

A)  Impression wax 
B)  Impression plaster 
C)  Vinyl polyether silicone 
D)  Dental impression compound 
A)  Impression wax 
B)  Impression plaster 
C)  Vinyl polyether silicone 
D)  Dental impression compound

Question 14

When using elastomers,which of the following should be blocked out with utility wax to prevent the impression material from locking under them and preventing removal of the impression tray?
1)Undercuts around bridge pontics
2)Open embrasures around periodontally involved teeth
3)Fixed implant fixtures
4)Hamular notch

Accepted Answer

A)  1,2,3,4 
B)  1,2,3 
C)  2,3,4 
D)  1,3,4 
A)  1,2,3,4 
B)  1,2,3 
C)  2,3,4 
D)  1,3,4

Question 15

What is occurring when an alginate impression appears to sweat,showing droplets on the surface?

Accepted Answer

A)  Syneresis 
B)  Hysteresis 
C)  Imbibition 
D)  Dehydration 
A)  Syneresis 
B)  Hysteresis 
C)  Imbibition 
D)  Dehydration

Question 16

Which statement is correct regarding alginate hydrocolloid?

Accepted Answer

A)  Fast-set alginate has a working time of 2 to 3 minutes. 
B)  Some moisture will be lost from the impression even in 100% humidity. 
C)  Alginate hydrocolloid should be removed slowly to prevent deformation of critical surfaces. 
D)  Adjusting the powder-to-water ratio is the best way to lengthen or shorten the setting time. 
A)  Fast-set alginate has a working time of 2 to 3 minutes. 
B)  Some moisture will be lost from the impression even in 100% humidity. 
C)  Alginate hydrocolloid should be removed slowly to prevent deformation of critical surfaces. 
D)  Adjusting the powder-to-water ratio is the best way to lengthen or shorten the setting time.

Question 17

Some practitioners use a specially formulated addition silicone material in an automatic mixing cartridge system to make which types of dies?

Accepted Answer

A)  Direct composite inlays 
B)  Indirect composite inlays 
C)  Porcelain jacket crowns 
D)  Porcelain-fused-to-metal crowns 
A)  Direct composite inlays 
B)  Indirect composite inlays 
C)  Porcelain jacket crowns 
D)  Porcelain-fused-to-metal crowns

Question 18

List and describe the different types of impression materials suitable for crown and bridge procedures.

Accepted Answer

•Polysulfide: An elastic impression mate

Question 19

When should impressions be disinfected?

Accepted Answer

A)  At the dental lab check-in 
B)  Before rinsing with water 
C)  At the chairside upon removal 
D)  For an hour before pouring in gypsum 
A)  At the dental lab check-in 
B)  Before rinsing with water 
C)  At the chairside upon removal 
D)  For an hour before pouring in gypsum

Question 20

Which of the following is the most widely used dental impression material?

Accepted Answer

A)  Reversible hydrocolloid 
B)  Irreversible hydrocolloid 
C)  Addition of silicone impression material 
D)  Condensation silicone impression material 
A)  Reversible hydrocolloid 
B)  Irreversible hydrocolloid 
C)  Addition of silicone impression material 
D)  Condensation silicone impression material

Which of the following is true for hydrocolloids in dentistry?

What could occur if a cast is made from an improperly disinfected impression?

Which characteristic should be considered when choosing an impression tray?

Which of the following impression materials has the smallest dimensional change on setting of all elastomeric and hydrocolloid impression materials?

For a maxillary alginate impression,the operator stands just _ the patient at the _ o'clock position and retracts the corner of the mouth with the side of the tray while retracting the other corner of the mouth with the index finger of the other hand.

_____ gloves should be used when mixing PVS putty.

Match the items with the correct description below. -Colloid

The completed impression forms a _ reproduction of the teeth and tissues,and the replica or model forms a _ replica of the teeth and tissues.

Of the items listed,which would not be made from an alginate impression?

What is the ideal time frame for pouring an alginate impression?

The temperature at which the hydrocolloid liquefies is not the same temperature at which it solidifies.What is this property called?

Mixed alginate should be loaded into the impression tray in _ increments as _ as possible.

Which of the following is an elastic impression material?

What is occurring when an alginate impression appears to sweat,showing droplets on the surface?

Which statement is correct regarding alginate hydrocolloid?

Some practitioners use a specially formulated addition silicone material in an automatic mixing cartridge system to make which types of dies?

List and describe the different types of impression materials suitable for crown and bridge procedures.

When should impressions be disinfected?

Which of the following is the most widely used dental impression material?

Introduction to Dental Materials

Oral Environment and Patient Considerations

Physical and Mechanical Properties of Dental Materials

General Handling and Safety of Dental Materials in the Dental Office

Principles of Bonding

Composites, glass Ionomers, and Compomers

Preventive and Desensitizing Materials

Teeth Whitening Materials and Procedures

Dental Ceramics

Dental Amalgam

Casting Metals, solders, and Wrought Metal Alloys

Dental Implants

Abrasion, finishing, and Polishing

Dental Cement

Gypsum and Wax Products

Polymers for Prosthetic Dentistry

Provisional Restorations

Preventive and Corrective Oral Appliances

Filters

Exam 15: Impression Materials

Which of the following is true for hydrocolloids in dentistry?

What could occur if a cast is made from an improperly disinfected impression?

Which characteristic should be considered when choosing an impression tray?

Which of the following impression materials has the smallest dimensional change on setting of all elastomeric and hydrocolloid impression materials?

For a maxillary alginate impression,the operator stands just _____ the patient at the _____ o'clock position and retracts the corner of the mouth with the side of the tray while retracting the other corner of the mouth with the index finger of the other hand.

_____ gloves should be used when mixing PVS putty.

Match the items with the correct description below. -Colloid

The completed impression forms a _____ reproduction of the teeth and tissues,and the replica or model forms a _____ replica of the teeth and tissues.

Of the items listed,which would not be made from an alginate impression?

What is the ideal time frame for pouring an alginate impression?

The temperature at which the hydrocolloid liquefies is not the same temperature at which it solidifies.What is this property called?

Mixed alginate should be loaded into the impression tray in _____ increments as _____ as possible.

Which of the following is an elastic impression material?

What is occurring when an alginate impression appears to sweat,showing droplets on the surface?

Which statement is correct regarding alginate hydrocolloid?

Some practitioners use a specially formulated addition silicone material in an automatic mixing cartridge system to make which types of dies?

List and describe the different types of impression materials suitable for crown and bridge procedures.

When should impressions be disinfected?

Which of the following is the most widely used dental impression material?

Introduction to Dental Materials

Oral Environment and Patient Considerations

Physical and Mechanical Properties of Dental Materials

General Handling and Safety of Dental Materials in the Dental Office

Principles of Bonding

Composites, glass Ionomers, and Compomers

Preventive and Desensitizing Materials

Teeth Whitening Materials and Procedures

Dental Ceramics

Dental Amalgam

Casting Metals, solders, and Wrought Metal Alloys

Dental Implants

Abrasion, finishing, and Polishing

Dental Cement

Gypsum and Wax Products

Polymers for Prosthetic Dentistry

Provisional Restorations

Preventive and Corrective Oral Appliances

Filters

For a maxillary alginate impression,the operator stands just _ the patient at the _ o'clock position and retracts the corner of the mouth with the side of the tray while retracting the other corner of the mouth with the index finger of the other hand.

The completed impression forms a _ reproduction of the teeth and tissues,and the replica or model forms a _ replica of the teeth and tissues.

Mixed alginate should be loaded into the impression tray in _ increments as _ as possible.