Alginate Impressions Quiz
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Questions and Answers

What is the difference between a true solution and a suspension?

  • The dispersed phase in a suspension can't be seen by the naked eye.
  • Particle size of the dispersed phase is large in a true solution. (correct)
  • A true solution involves solid particles while a suspension involves liquid particles.
  • The dispersed phase in a true solution is insoluble in the dispersion medium.

    • How are reversible hydrocolloids different from irreversible hydrocolloids?

  • Irreversible hydrocolloids involve primary bond formation. (correct)
  • Reversible hydrocolloids are stronger than irreversible hydrocolloids.
  • Reversible hydrocolloids involve chemical reactions.
  • Irreversible hydrocolloids form secondary bonds upon gelation.

    • Which type of colloid involves a liquid dispersed phase instead of a solid?

  • Suspension
  • Emulsion (correct)
  • Gel
  • Sol

    • What defines hydrocolloids?

    <p>The particle size of the dispersed phase is smaller than in suspensions.</p> Signup and view all the answers

    What causes agglomeration in hydrocolloids leading to gelation?

    <p>Decrease in temperature</p> Signup and view all the answers

    In what state are hydrocolloids inserted in the mouth to record details?

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

    What is the role of Sodium triphosphate in alginate?

    <p>Delays gel formation</p> Signup and view all the answers

    Which type of alginate has a shorter working time?

    <p>Fast set</p> Signup and view all the answers

    In the setting reaction of alginate, what is formed when Calcium sulfate reacts with Sodium triphosphate?

    <p>Calcium phosphate + Sodium sulfate</p> Signup and view all the answers

    Which compound is involved in forming the set gel during the setting reaction of alginate?

    <p>Calcium alginate</p> Signup and view all the answers

    What equipment is NOT typically used during the manipulation of alginate?

    <p>Plaster spatula</p> Signup and view all the answers

    Which additive is commonly used in alginate for disinfection purposes?

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

    What is the clinical importance of removing the impression from the mouth with a snap removal?

    <p>To increase tear strength</p> Signup and view all the answers

    Why should the impression be removed suddenly from the mouth?

    <p>To reduce permanent deformation</p> Signup and view all the answers

    What is the primary difference between irreversible and reversible hydrocolloids in terms of gelation?

    <p>Irreversible hydrocolloids undergo gelation through a chemical reaction, while reversible hydrocolloids undergo gelation through a physical reaction.</p> Signup and view all the answers

    How does the water content of impressions affect gypsum materials?

    <p>Inhibits setting and results in a soft surface</p> Signup and view all the answers

    What are the advantages of alginate impression material?

    <p>Inexpensive, easy to use, hydrophilic, no need for custom trays</p> Signup and view all the answers

    What is the mode of setting for alginate impression material inside the patient's mouth?

    <p>Faster at tissue side then tray wise</p> Signup and view all the answers

    Which component serves as the main reaction ingredient in Na alginate or K alginate to form gel in irreversible hydrocolloids?

    <p>CaSO4.2H2O</p> Signup and view all the answers

    Why are irreversible hydrocolloids not suitable for crown and bridge, inlays, or onlays?

    <p>They do not produce fine details required for such procedures.</p> Signup and view all the answers

    What is the primary reason for preferring individual sealed packets over bulk containers for irreversible hydrocolloids like Alginate impression materials?

    <p>Less chance for contamination during storage.</p> Signup and view all the answers

    What role does CaSO4.2H2O play in the gelation process of irreversible hydrocolloids?

    <p>It is the main reaction ingredient that forms the gel.</p> Signup and view all the answers

    What are the disadvantages of alginate impression material?

    <p>Tears easily, incompatible with gypsum materials</p> Signup and view all the answers

    Why is tempering done in the manipulation of agar impression material?

    <p>To avoid burning the patient's oral tissues</p> Signup and view all the answers

    What is the purpose of adding potassium sulfate to gypsum cast material?

    <p>To accelerate the setting of the material</p> Signup and view all the answers

    At what temperature does the 'sol' state of agar impression material change to 'gel'?

    <p>37-45°C</p> Signup and view all the answers

    What is the function of a conditioning unit in the manipulation of agar impression material?

    <p>To control and adjust the temperature of the material</p> Signup and view all the answers

    What is the primary function of Na alginate or K alginate in irreversible hydrocolloids?

    <p>To form a sol with water that later reacts with calcium to form gel.</p> Signup and view all the answers

    What happens to the 'gel' state of agar impression material when heated?

    <p>It changes back to 'sol'</p> Signup and view all the answers

    What transformation does agar impression material undergo when cooling from 'sol' state?

    <p>It changes from 'sol' to 'gel'</p> Signup and view all the answers

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