Question 1

Sheets of baseplate wax are usually layered to:

Accepted Answer

A)   produce patterns for metal castings using the lost wax technique.
B)   construct the metal framework of partial and complete dentures.
C)   produce the form on which denture teeth are set.
D)   form the base portion of a gypsum model.E) A) and B)
F) All of the above

Question 2

Match the items with the correct description below.
-Models

Accepted Answer

A)  Replicas of the prepared teeth that are generally removable from the working cast
B)  Hard replicas of hard and soft tissues of the patient's oral cavity made from gypsum products
C)  Casts generally made from dental plaster or stone and used for patient education,treatment planning,and tracking of the progress of treatmentD) None of the above
E) A) and C)

Question 3

Match the items with the correct description below.
-Diagnostic casts

Accepted Answer

A)  Replicas of the prepared teeth that are generally removable from the working cast
B)  Hard replicas of hard and soft tissues of the patient's oral cavity made from gypsum products
C)  Casts generally made from dental plaster or stone and used for patient education,treatment planning,and tracking of the progress of treatmentD) All of the above
E) B) and C)

Question 4

Which kind of wax is used to construct the metal framework of partial and complete dentures?

Accepted Answer

A)   Utility wax
B)   Boxing wax
C)   Casting wax
D)   Baseplate waxE) A) and D)
F) B) and D)

Question 5

Which material is able to withstand the high heat and stress produced when molten metal is forced into molds to form indirect restorations?

Accepted Answer

A)   Dental investment
B)   Model plaster
C)   Dental stone
D)   Die stoneE) B) and C)
F) A) and B)

Question 6

As the temperature of the wax increases,the _____ of the wax decreases until the wax becomes a liquid.

Accepted Answer

A)   melting point
B)   flowability
C)   stability
D)   viscosityE) B) and C)
F) B) and D)

Question 7

What does it mean when freshly mixed gypsum loses its gloss?

Accepted Answer

A)   Beginning of the working time
B)   Final compressive strength
C)   Initial set
D)   Final setE) C) and D)
F) B) and C)

Question 8

β-Hemihydrate is commonly used for:

Accepted Answer

A)   die stone.
B)   working casts.
C)   diagnostic models.
D)   dental investment.E) B) and C)
F) All of the above

Question 9

For regular-set gypsum products,the initial set occurs within _____ minutes from the beginning of the mix.

Accepted Answer

A)   1 to 2
B)   3 to 5
C)   7 to 9
D)   12 to 14E) A) and B)
F) All of the above

Question 10

Which of the following is true of the double-pour method for fabricating and trimming diagnostic/working casts?

Accepted Answer

A)   This technique involves two separate mixes.
B)   After the impression is poured,the remaining material is used for the base.
C)   One mix of gypsum is produced to pour the anatomic and art portions of the cast.
D)   The material in the inverted impression may slump away from the impression,causing distortion of the cast or trapping or air voids.E) None of the above
F) B) and C)

Question 11

Which of the following gypsum products is ideal for making full or partial denture models,orthodontic models,and casts requiring higher strength and abrasive resistance?

Accepted Answer

A)   Impression plaster (Type I) 
B)   Model plaster (Type II) 
C)   Dental stone (Type III) 
D)   Dental stone,high strength (Type IV) E) B) and C)
F) None of the above

Question 12

Which of the following is true regarding trimming of models with a model trimmer?

Accepted Answer

A)   The occlusal plane should be perpendicular with the base.
B)   Bases and anatomic portions should be soaked for 5 to 10 minutes before trimming.
C)   The anterior portion of both the maxillary and mandibular arch models should be trimmed to a point at the midline.
D)   The casts should be trimmed so that proportionately the base makes up one third and the anatomic portion two thirds of the total depth.E) B) and C)
F) A) and D)

Question 13

An increase in the recommended water-to-powder ratio will result in a _____ accurate model.

Accepted Answer

A)   stronger,more
B)   stronger,less
C)   weaker,more
D)   weaker,lessE) A) and B)
F) A) and C)

Question 14

Match the items with the correct description below.
-Casts

Accepted Answer

A)  Replicas of the prepared teeth that are generally removable from the working cast
B)  Hard replicas of hard and soft tissues of the patient's oral cavity made from gypsum products
C)  Casts generally made from dental plaster or stone and used for patient education,treatment planning,and tracking of the progress of treatmentD) A) and C)
E) All of the above

Question 15

Wax patterns should be invested within _____ of carving.

Accepted Answer

A)   minutes
B)   hours
C)   days
D)   weeksE) C) and D)
F) None of the above

Question 16

Which of the following represents the correct sequence for creation of a casting using the lost wax technique?
1) The pattern and sprue are encased in an investment ring.
2) A wax or plastic sprue is attached to the pattern.
3) A wax pattern of the restoration is carved on the die.
4) The enclosed pattern and sprue are heated in a burnout oven at high temperatures.

Accepted Answer

A)   3,1,2,4
B)   3,2,1,4
C)   2,3,1,4
D)   3,2,4,1E) A) and B)
F) A) and C)

Question 17

Which of the following kinds of waxes is used to adhere components of metal,gypsum,or resin together temporarily during fabrication and repair?

Accepted Answer

A)   Inlay wax
B)   Sticky wax
C)   Boxing wax
D)   Corrective impression waxE) A) and B)
F) A) and C)

Exam 16: Gypsum and Wax Products

Which of the following kinds of waxes is used to adhere components of metal,gypsum,or resin together temporarily during fabrication and repair?

Correct Answer
verified

Match the items with the correct description below. -Models

Correct Answer
verified

Which of the following gypsum products is ideal for making full or partial denture models,orthodontic models,and casts requiring higher strength and abrasive resistance?

Correct Answer
verified

Match the items with the correct description below. -Casts

Correct Answer
verified

Sheets of baseplate wax are usually layered to:

Correct Answer
verified

Which of the following is true regarding trimming of models with a model trimmer?

Correct Answer
verified

Wax patterns should be invested within _____ of carving.

Correct Answer
verified

Which material is able to withstand the high heat and stress produced when molten metal is forced into molds to form indirect restorations?

Correct Answer
verified

Which kind of wax is used to construct the metal framework of partial and complete dentures?

Correct Answer
verified

Match the items with the correct description below. -Diagnostic casts

Correct Answer
verified

An increase in the recommended water-to-powder ratio will result in a _____ accurate model.

Correct Answer
verified

As the temperature of the wax increases,the _____ of the wax decreases until the wax becomes a liquid.

Correct Answer
verified

Correct Answer
verified

For regular-set gypsum products,the initial set occurs within _____ minutes from the beginning of the mix.

Correct Answer
verified

What does it mean when freshly mixed gypsum loses its gloss?

Correct Answer
verified

β-Hemihydrate is commonly used for:

Correct Answer
verified

Which of the following is true of the double-pour method for fabricating and trimming diagnostic/working casts?

Correct Answer
verified

Exam 16: Gypsum and Wax Products

Which of the following kinds of waxes is used to adhere components of metal,gypsum,or resin together temporarily during fabrication and repair?

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Models

Correct AnswerverifiedShow Answer

Which of the following gypsum products is ideal for making full or partial denture models,orthodontic models,and casts requiring higher strength and abrasive resistance?

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Casts

Correct AnswerverifiedShow Answer

Sheets of baseplate wax are usually layered to:

Correct AnswerverifiedShow Answer

Which of the following is true regarding trimming of models with a model trimmer?

Correct AnswerverifiedShow Answer

Wax patterns should be invested within _____ of carving.

Correct AnswerverifiedShow Answer

Which material is able to withstand the high heat and stress produced when molten metal is forced into molds to form indirect restorations?

Correct AnswerverifiedShow Answer

Which kind of wax is used to construct the metal framework of partial and complete dentures?

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Diagnostic casts

Correct AnswerverifiedShow Answer

An increase in the recommended water-to-powder ratio will result in a _____ accurate model.

Correct AnswerverifiedShow Answer

As the temperature of the wax increases,the _____ of the wax decreases until the wax becomes a liquid.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

For regular-set gypsum products,the initial set occurs within _____ minutes from the beginning of the mix.

Correct AnswerverifiedShow Answer

What does it mean when freshly mixed gypsum loses its gloss?

Correct AnswerverifiedShow Answer

β-Hemihydrate is commonly used for:

Correct AnswerverifiedShow Answer

Which of the following is true of the double-pour method for fabricating and trimming diagnostic/working casts?

Correct AnswerverifiedShow Answer

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