Question 1

Which of the following represents the time period designated for the initial set of gypsum?

Accepted Answer

A)  Pour begins until the pour is complete. 
B)  Powder is added to the water until mixing is complete. 
C)  Powder is added to the water until the pour is complete. 
D)  Powder is added to the water until the material cannot be used. 
A)  Pour begins until the pour is complete. 
B)  Powder is added to the water until mixing is complete. 
C)  Powder is added to the water until the pour is complete. 
D)  Powder is added to the water until the material cannot be used.

Question 2

The inherent roughness limits the ability of gypsum materials to capture the finest details of impressions. Reproduction of detail is sufficient for most applications.

Accepted Answer

A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect. 
A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect.

Question 3

What is the purpose of the vibrating table?

Accepted Answer

A)  Helps remove any bubbles that formed during mixing 
B)  Ensures a smooth mix of the materials 
C)  Wets the gypsum powder particles 
D)  Initiates the setting reaction 
A)  Helps remove any bubbles that formed during mixing 
B)  Ensures a smooth mix of the materials 
C)  Wets the gypsum powder particles 
D)  Initiates the setting reaction

Question 4

If the temperature of the water used to mix gypsum materials is raised up to body temperature (37.5° C), the setting time decreases. However, if water temperature is raised above 37.5° C, the setting time will increase.

Accepted Answer

A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect. 
A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect.

Which of the following represents the time period designated for the initial set of gypsum?

The inherent roughness limits the ability of gypsum materials to capture the finest details of impressions. Reproduction of detail is sufficient for most applications.

What is the purpose of the vibrating table?

If the temperature of the water used to mix gypsum materials is raised up to body temperature (37.5° C), the setting time decreases. However, if water temperature is raised above 37.5° C, the setting time will increase.

Introduction to Restorative Dental Materials

Properties of Materials

Preventive Dental Materials

Direct Esthetic Restorative Materials

Dental Amalgam

Finishing, Polishing, and Cleansing Materials

Cements

Impression Materials

Waxes

Casting Alloys, Wrought Alloys, and Solders

Casting, Soldering, and Welding

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

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Exam 9: Model and Die Materials

Which of the following represents the time period designated for the initial set of gypsum?

The inherent roughness limits the ability of gypsum materials to capture the finest details of impressions. Reproduction of detail is sufficient for most applications.

What is the purpose of the vibrating table?

If the temperature of the water used to mix gypsum materials is raised up to body temperature (37.5° C), the setting time decreases. However, if water temperature is raised above 37.5° C, the setting time will increase.

Introduction to Restorative Dental Materials

Properties of Materials

Preventive Dental Materials

Direct Esthetic Restorative Materials

Dental Amalgam

Finishing, Polishing, and Cleansing Materials

Cements

Impression Materials

Waxes

Casting Alloys, Wrought Alloys, and Solders

Casting, Soldering, and Welding

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

Filters