Dental Materials Practice Test

Question 1

A laminate impression technique utilizes_______________?

Accepted Answer

A.	Syringe agar and chilled tray alginate

Question 2

Most flexible impression material______________?

Accepted Answer

A.	Impression compound

Question 3

Which of the following is correct arrangement of impression material regarding linear contraction in ascending order ?

Accepted Answer

A.	Addition silicone < polyether < polysulfide < condensation silicone

Question 4

Which of the following best describes the working time of impression material ?

Accepted Answer

C.	The time for start of mixing till just before the start of appearing elastic properties of impression material

Question 5

Which of the following is used as surface hardener in Impression material ?

Accepted Answer

A.	2% Potassium sulfate

Question 6

Which of the following is correct regarding chemical setting of condensation silicone_______________?

Accepted Answer

A.	Polymerization occurs with repeated elimination of small molecules

Question 7

Dimensional stability of hydrocolloid impressions may be achieved by_________________?

Accepted Answer

D.	Using humidor

Question 8

To make the vinyl Polysiloxane hydrophilic the following is added_______________?

Accepted Answer

B.	Surfactant

Question 9

The role of magnesium chloride in zinc oxide eugenol impression paste_________________?

Accepted Answer

D.	Accelerator

Question 10

Alginates are made dust free by adding______________?

Accepted Answer

B.	Glyecrol

Question 11

The process of changing the rubber base product or liquid polymer, to a rubber like material is generally known as_____________?

Accepted Answer

C.	Vulconization

Question 12

Which of the following is not true about elastomeric impression ?

Accepted Answer

A.	Single mix material have higher viscosity

Question 13

Impression compound is characterized by all of the following except_______________?

Accepted Answer

B.	Is a thermoset material

Question 14

Rapid removal of rubber impression with a single firm motion results in____________________?

Accepted Answer

C.	Minimal permanent deformation

Question 15

Which of the following impression material is rigid ?

Accepted Answer

A.	Zinc oxide-eugenol

Question 16

Elastomers except: Polyether are_______________?

Accepted Answer

B.	Hydrophobic

Question 17

Hardening solutions are used with impression made of________________?

Accepted Answer

A.	Hydrocolloid

Question 18

Alginate impression material is similar to Agar-agar impression material in the following respect________________?

Accepted Answer

C.	Deformation during removal of impression occurs due to distortion of gel fibers

Question 19

Gelation temparature of agar is between________________?

Accepted Answer

C.	37°C to 50°C

Question 20

Brush heap structure is found in______________?

Accepted Answer

B.	Agar