Disinfection of Dental Impressions Quiz

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What are the two main types of silicone impression materials?

Polyether and polyvinyl siloxane

Addition and polyvinyl siloxane

Polyether and condensation

Condensation and addition (vinyl silicone) (correct)

What is the composition of the base in a condensation silicone impression material?

Dimethylsiloxane with OH reactive group and reinforcing agent (silica) (correct)

Ethanol and cross-linked siloxane polymer

Polymethyl hydrosiloxane with silane terminated silicon and reinforcing filler

Tin organic ester suspension in alkyl acetate such as orthoethyl silicate

What is the role of the accelerator (catalyst) in a condensation silicone impression material?

It increases the setting time of the material

It increases the permanent deformation of the material

It contains the siloxane polymer

It is a tin organic ester suspension in alkyl acetate (correct)

What is the main reaction that occurs in a condensation silicone impression material?

Cross-linking between the siloxane polymer and alkyl silicate in the presence of tin octate Signup and view all the answers

What is the composition of the base in an addition (vinyl silicone) impression material?

Polymethyl hydrosiloxane with silane terminated silicon and reinforcing filler Signup and view all the answers

What is the main difference between condensation and addition (vinyl silicone) impression materials?

Condensation materials undergo a cross-linking reaction, while addition materials undergo a polymerization reaction Signup and view all the answers

Which disinfectant is recommended for disinfection of polyether impressions?

Iodophor Signup and view all the answers

What is the working time order from highest to lowest for polysulfide, silicones, and polyether materials?

Polysulfide > Silicones > Polyether Signup and view all the answers

What is the correct order of tear strength from highest to lowest for Polysulfide, Addition Silicone, Polyether, and Condensation Silicone?

Polysulfide > Add.Silicone > Polyether > Cond.Silicone Signup and view all the answers

Which impression material requires immersion in iodophor or glutaraldehyde for 10-30 minutes for disinfection?

ZOE Signup and view all the answers

What is the recommended method for disinfection of agar impressions?

Immersing in hypochlorite solution Signup and view all the answers

What are digital impressions also known as?

3-D intraoral scanning Signup and view all the answers

What is a key advantage of automixing when it comes to Polyether rubber impression material?

Provides a more accurate final impression Signup and view all the answers

How can contact between latex gloves and addition silicon material affect the setting process?

Prevent or retard setting by poisoning the platinic catalyst Signup and view all the answers

What is a drawback of Polyether rubber materials compared to condensation silicon?

Shorter working time Signup and view all the answers

How are Polyether rubber impression materials typically supplied for use?

As light, regular, and heavy bodied in two collapsible tubes Signup and view all the answers

What is the primary reason for creating extra space in the impression tray?

To prevent undercuts in the impression Signup and view all the answers

What type of reaction is involved in Polyether rubber impression material setting process?

Addition polymerization reaction Signup and view all the answers

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