Syneresis
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Questions and Answers

Which type of impression material is NOT good for undercuts?

  • Elastomeric
  • Rigid Impression compound
  • ZOE paste (correct)
  • Plaster of Paris
  • Which type of impression material is irreversible and suffers imbibition?

  • Silicones (PVS)
  • Impression compound
  • Alginate (correct)
  • Polysulfide
  • Which type of impression material is best for edentulous arches?

  • Polysulfide
  • Silicones (PVS) (correct)
  • Alginate
  • Impression compound
  • Which tray selection is recommended for thickness of impression material?

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

    What is the fusing temperature order for thermoplastic compound?

    <p>Black &gt; Red &gt; Green &gt; Grey</p> Signup and view all the answers

    What is the recommended time to pour up alginate impressions?

    <p>Within 8 minutes</p> Signup and view all the answers

    What is the recommended head position during impression taking?

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

    Which muscle movements are involved in the impression taking process?

    <p>Border molding</p> Signup and view all the answers

    What is the recommended method to control saliva during impression taking?

    <p>Suction &amp; astringent mouthwash</p> Signup and view all the answers

    Which side should be retracted with fingers during tray insertion for upper denture impression?

    <p>Near side</p> Signup and view all the answers

    Which denture impression material has the highest cost?

    <p>Polyvinyl Siloxane</p> Signup and view all the answers

    Which of the following is the correct sequence of patient and lab visits for impressions and impression materials for complete and partial dentures?

    <p>Preliminary Impressions -&gt; Custom trays -&gt; Final Impressions -&gt; Record bases &amp; Occlusion rims -&gt; Intermaxillary Records Set-up -&gt; Trial Denture Processing &amp; Lab Remount -&gt; Insertion Clinical Remount</p> Signup and view all the answers

    According to the text, what does the goal of an impression depend on?

    <p>Purpose of the impression</p> Signup and view all the answers

    What is retention in the context of denture retention?

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

    What is cohesion in the context of denture retention?

    <p>Atmospheric pressure (PPS/suction)</p> Signup and view all the answers

    What physical property of denture retention can be increased by increasing surface area?

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

    What physical property of denture retention can be increased by increasing contact (closeness)?

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

    Which material is CONTRAINDICATED in dentitions with large gingival embrasures and cemented fixed bridges with high pontics?

    <p>Polyvinyl Siloxane</p> Signup and view all the answers

    What is the purpose of tray fabrication in the impression process?

    <p>To provide a preliminary cast</p> Signup and view all the answers

    Which material has greater cohesion to itself than it does to mucosa, allowing it to be easily removed from the mouth before setting?

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

    Which material is known for its slow set and continues to cure over time?

    <p>Polysulfide Rubber</p> Signup and view all the answers

    What is the purpose of tissue stops in wax block out for complete dentures?

    <p>To prevent irritation</p> Signup and view all the answers

    What is the main objective of the second impression in the denture fabrication process?

    <p>To create a final cast</p> Signup and view all the answers

    Which of the following impression materials is best for recording excellent tissue detail without compressing the tissue?

    <p>Poly Vinyl Siloxane (PVS)</p> Signup and view all the answers

    Which of the following impression materials is less sensitive to moisture than Zinc Oxide-Eugenol (ZOE) and are elastic?

    <p>Poly Vinyl Siloxane (PVS)</p> Signup and view all the answers

    Which of the following impression materials has the best tear strength and excellent sheer thinning stability?

    <p>Poly Vinyl Siloxane (PVS)</p> Signup and view all the answers

    Which of the following impression materials is hydrophobic and has poor sheer-thinning properties?

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

    Which of the following impression materials is suitable for taking final impressions for complete dentures without significant undercuts and large embrasures?

    <p>Poly Vinyl Siloxane (PVS)</p> Signup and view all the answers

    Which of the following impression materials requires tissue stops for accurate impressions?

    <p>Poly Vinyl Siloxane (PVS)</p> Signup and view all the answers

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