Disinfection of Dental Impressions Quiz
18 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

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?

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

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

    <p>Polymethyl hydrosiloxane with silane terminated silicon and reinforcing filler</p> Signup and view all the answers

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

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

    Which disinfectant is recommended for disinfection of polyether impressions?

    <p>Iodophor</p> Signup and view all the answers

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

    <p>Polysulfide &gt; Silicones &gt; Polyether</p> 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?

    <p>Polysulfide &gt; Add.Silicone &gt; Polyether &gt; Cond.Silicone</p> Signup and view all the answers

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

    <p>ZOE</p> Signup and view all the answers

    What is the recommended method for disinfection of agar impressions?

    <p>Immersing in hypochlorite solution</p> Signup and view all the answers

    What are digital impressions also known as?

    <p>3-D intraoral scanning</p> Signup and view all the answers

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

    <p>Provides a more accurate final impression</p> Signup and view all the answers

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

    <p>Prevent or retard setting by poisoning the platinic catalyst</p> Signup and view all the answers

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

    <p>Shorter working time</p> Signup and view all the answers

    How are Polyether rubber impression materials typically supplied for use?

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

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

    <p>To prevent undercuts in the impression</p> Signup and view all the answers

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

    <p>Addition polymerization reaction</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser