Comparison of Elastomeric Impression Materials
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Questions and Answers

What is a key requirement for materials used to make complete dentures?

  • Degradability
  • Allergenicity
  • Biocompatibility (correct)
  • Toxicity

    • Which of the following is NOT a requirement for prosthodontic impression materials?

  • Viscosity
  • Taste and odor
  • Low elasticity (correct)
  • Dimensional stability

    • In the context of compound types I and II, what does Type I refer to?

  • Higher fusing material
  • Tray adaptation material
  • Impression material for edentulous patients (correct)
  • Border molding material

    • Which of the following is NOT a desired mechanical property for materials used in complete dentures?

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

    What is a key factor for an impression material's shelf life?

    <p>Dimensional stability</p> Signup and view all the answers

    Which of the following is a requirement for Type I compound?

    <p>Softened by heat</p> Signup and view all the answers

    Why should prosthodontic impression materials have adequate wettability of oral tissues?

    <p>To allow for accurate capturing of oral structures</p> Signup and view all the answers

    Which property is essential for preventing tears during removal of prosthodontic impressions?

    <p>High elasticity</p> Signup and view all the answers

    Why is it necessary for impression materials to set into a rubbery/rigid solid in a reasonable amount of time?

    <p>To avoid delaying treatment</p> Signup and view all the answers

    What is the main function of wax spacer when using Type I compound for border molding?

    <p>Maintain adequate space for the final impression</p> Signup and view all the answers

    What is the principal ingredient of the Base o Polysulfide polymer?

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

    Which material is used as a plasticizer for viscosity in the Base o Polysulfide polymer?

    <p>Dibutyl phthalate</p> Signup and view all the answers

    What is the function of oleic or stearic acid in the Base o Polysulfide polymer?

    <p>Controls setting reaction</p> Signup and view all the answers

    How long is the working time for Polyether Elastomer impressions?

    <p>2.5 minutes</p> Signup and view all the answers

    Which component is used as an initiator in Addition Silicones?

    <p>Divinyl polymethyl siloxane</p> Signup and view all the answers

    What is the function of oil-based diluents in Addition Silicones?

    <p>Retards the setting time</p> Signup and view all the answers

    What component thickens the accelerator paste in Addition Silicones?

    <p>Thickening agents</p> Signup and view all the answers

    How long can the cast be poured after making the impression for Addition Silicones?

    <p>&gt; 1 week</p> Signup and view all the answers

    What is the function of Titanium oxide and Zinc in the Base o Polysulfide polymer paste?

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

    What role do Lead dioxide, hydrated copper oxide, or organic peroxide play in the Accelerator/Reactor of Polysulfide polymer?

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

    Which type of gloves inhibit polymerization according to the text?

    <p>Latex gloves</p> Signup and view all the answers

    Which elastomeric impression material has the highest flow rate?

    <p>Addition Silicones</p> Signup and view all the answers

    What can silicone impressions distort from?

    <p>Water and humidity</p> Signup and view all the answers

    What is a disadvantage of using Polysulfide Rubber (Mercaptan) as an elastomeric impression material?

    <p>Unpleasant odor</p> Signup and view all the answers

    Why is the WT (working time) 2.5 minutes for a specific material mentioned in the text?

    <p>To speed up the process</p> Signup and view all the answers

    Which elastomeric impression material requires a custom tray for usage?

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

    What can cause stone imperfections according to the text?

    <p>Release of H (hydrogen)</p> Signup and view all the answers

    What is a common disadvantage shared by Condensation Silicones and Polyethers?

    <p>High dimensional change</p> Signup and view all the answers

    Which type of impression material has high stiffness and is hard to remove?

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

    Which elastomeric impression material is known for being hydrophobic, making it difficult to pour in stone?

    <p>Condensation Silicones</p> Signup and view all the answers

    What is a unique characteristic of silicone impressions regarding their distortion?

    <p>They distort due to light exposure</p> Signup and view all the answers

    Which elastomeric impression material is described as having 'Low Flow rates'?

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

    Why must impressions be poured ASAP within 30 minutes-1 hour according to the text?

    <p>To ensure the impression does not dry out</p> Signup and view all the answers

    What is a key property of Addition Silicones that makes them stand out compared to other elastomeric impression materials?

    <p>High dimensional stability</p> Signup and view all the answers

    What can damage silicone impressions according to the text?

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

    Why is Polyethers not suitable for pouring in stone according to the text?

    <p>They are hydrophobic</p> Signup and view all the answers

    What impacts the flexibility of a material mentioned in the text?

    <p>High flow rate</p> Signup and view all the answers

    Among the listed elastomeric impression materials, which one has the highest tear strength?

    <p>Addition Silicones</p> Signup and view all the answers

    What is a drawback of materials with low tear strength according to the text?

    <p>Greater chance of distortion</p> Signup and view all the answers

    Which material has a lower viscosity and has a tendency to flow down the throat when used?

    <p>Condensation Silicones</p> Signup and view all the answers

    Study Notes

    Requirements for Materials Used in Complete Dentures

    • A key requirement for materials used to make complete dentures is that they should have adequate wettability of oral tissues.

    Prosthodontic Impression Materials

    • The requirement that is NOT needed for prosthodontic impression materials is high strength.
    • Type I compound refers to a material used for border molding.
    • A desired mechanical property for materials used in complete dentures is the ability to set into a rubbery/rigid solid in a reasonable amount of time.

    Impression Materials' Properties

    • A key factor for an impression material's shelf life is the storage conditions.
    • Adequate wettability of oral tissues is necessary for impression materials to ensure proper flow and adaptation.
    • The property essential for preventing tears during removal of prosthodontic impressions is high tear strength.
    • Impression materials should set into a rubbery/rigid solid in a reasonable amount of time to ensure accurate impressions.

    Type I Compound

    • The main function of wax spacer when using Type I compound for border molding is to create a space for the impression material.

    Polysulfide Polymer

    • The principal ingredient of the Base o Polysulfide polymer is polysulfide.
    • The material used as a plasticizer for viscosity in the Base o Polysulfide polymer is dibutyl phthalate.
    • The function of oleic or stearic acid in the Base o Polysulfide polymer is to act as a surfactant.
    • Titanium oxide and Zinc are used as opaque fillers in the Base o Polysulfide polymer paste.
    • Lead dioxide, hydrated copper oxide, or organic peroxide play the role of catalysts in the Accelerator/Reactor of Polysulfide polymer.

    Addition Silicones

    • The component used as an initiator in Addition Silicones is platinum.
    • The function of oil-based diluents in Addition Silicones is to reduce the viscosity of the material.
    • The component that thickens the accelerator paste in Addition Silicones is silica.
    • The cast can be poured up to 24 hours after making the impression for Addition Silicones.

    Elastomeric Impression Materials

    • Latex gloves inhibit polymerization of some elastomeric impression materials.
    • Polyether Elastomer has the highest flow rate among elastomeric impression materials.
    • Silicone impressions can distort from heat and chemicals.
    • A disadvantage of using Polysulfide Rubber (Mercaptan) as an elastomeric impression material is its unpleasant odor.
    • The WT (working time) is 2.5 minutes for a specific material mentioned in the text because of the combination of its base and catalyst.
    • Condensation Silicones require a custom tray for usage.
    • Air incorporation and contamination can cause stone imperfections.
    • A common disadvantage shared by Condensation Silicones and Polyethers is their high permanent deformation.
    • Polyethers are known for having high stiffness and being hard to remove.
    • Addition Silicones are hydrophobic, making them difficult to pour in stone.
    • Silicone impressions have a unique characteristic of being resistant to distortion.
    • Condensation Silicones are described as having 'Low Flow rates'.
    • Impressions must be poured ASAP within 30 minutes-1 hour to prevent distortion and inaccuracy.
    • A key property of Addition Silicones that makes them stand out is their high precision and accuracy.
    • Silicone impressions can be damaged by heat and chemicals.
    • Polyethers are not suitable for pouring in stone due to their high water absorption and subsequent expansion.
    • The flexibility of a material is impacted by the molecular structure and the degree of cross-linking.
    • Among the listed elastomeric impression materials, Polyethers have the highest tear strength.
    • A drawback of materials with low tear strength is that they are prone to tearing during removal.
    • Condensation Silicones have a lower viscosity and have a tendency to flow down the throat when used.

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    Materials Used in the Management of Edentulous Patients PDF

    Description

    Learn about the properties, advantages, and disadvantages of popular elastomeric impression materials including Polysulfide Rubber (Mercaptan), Condensation Silicones, Addition Silicones, and Polyethers. Understand which material offers high tear strength, great reproduction, high flexibility, and more.

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