Bleaching Mechanism in Dental Hard Tissues
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Questions and Answers

What is the main mechanism of bleaching action?

  • Formation of hydrogen peroxide
  • Degradation of inorganic molecules
  • Reduction of discoloration by reflecting more light
  • Oxidation-reduction reaction resulting in degradation of complex organic molecules (correct)

    • What are the degradation products of the bleaching process composed of?

  • Lower molecular weight and less complex molecules (correct)
  • Carbon dioxide
  • High molecular weight complex organic molecules
  • Inorganic molecules

    • Which type of molecules do bleaching agents act on?

  • Hydrogen peroxide molecules
  • Complex organic molecules that reflect specific wavelength of light
  • Organic structure of dental hard tissues (correct)
  • Inorganic molecules

    • What is another name for the bleaching action?

    <p>Oxidation-reduction reaction (A)</p> Signup and view all the answers

    What technique uses heat and light to activate the bleaching material?

    <p>In-office bleaching (C)</p> Signup and view all the answers

    What is the most common material used for fabrication of bleaching tray?

    <p>Ethyl vinyl acetate (C)</p> Signup and view all the answers

    How long is the 35% carbamide peroxide gel applied to the tooth indentations in the guard when used in the dentist's office?

    <p>30 minutes (A)</p> Signup and view all the answers

    What is the most often used product for mouthguard bleaching?

    <p>Carbamide peroxide (C)</p> Signup and view all the answers

    What is the range of percentage of peroxide used in mouthguard bleaching?

    <p>10-35% (D)</p> Signup and view all the answers

    How long may the guard be in place at a time when using the l0% gel at home?

    <p>3 or 4 hours (A)</p> Signup and view all the answers

    What is the immediate step after placing a freshly mixed sodium perborate/water mixture in the pulp chamber during the walking bleaching technique?

    <p>Seal the access opening with a temporary filling (D)</p> Signup and view all the answers

    What is the purpose of applying a protective cement barrier in the walking bleaching technique?

    <p>To minimize leakage of bleaching agents (A)</p> Signup and view all the answers

    In case of internal and external discoloration, which treatment combination can be used?

    <p>Intracoronal bleaching and home bleaching using a night guard template (C)</p> Signup and view all the answers

    What is the essential requirement for isolating the tooth in the walking bleaching technique?

    <p>Rubber dam (C)</p> Signup and view all the answers

    After completion of bleaching in the walking bleaching technique, what is used to close the access opening?

    <p>Composite material (B)</p> Signup and view all the answers

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