Quiz on Impression Materials in Dentistry

What is the main reactive ingredient in impression plaster?

• Calcium sulfate β-hemihydrates

• Potassium sulfate

• Borax

• Alizarin

Which of the following is a disadvantage of impression plaster?

• Brittle and may fracture

• Good dimensional stability

• Easy to manipulate

• Hydrophilic nature

What type of impression material is used for preliminary impressions of edentulous arches?

• Light body elastomer

• Impression compound

• ZOE impression paste

• Alginate

Which of the following is a property of ideal impression materials?

• Poor dimensional stability

• Requires elaborate equipment for manipulation

• Non-toxic and non-irritant

• High viscosity before setting

What is the main purpose of using a separating medium with impression plaster?

• To increase setting time

• To prevent bonding of the cast to the impression

• To improve dimensional stability

• To enhance the taste

Which impression material is classified as an elastomer?

• Alginate

• Impression wax

• Polysulfide

• Impression plaster

What is the main reason for using tray adhesive with elastomers?

• To ensure retention during impression taking

• To enhance flow properties

• To reduce setting time

• To improve taste