Dental Amalgam and Mercury Hygiene Quiz
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Questions and Answers

What is dental amalgam?

  • A type of alloy made by mixing mercury with silver tin (correct)
  • A type of filling made with copper and zinc
  • A mixture of metals that includes mercury used to fill cavities
  • A type of metal used to increase the strength and hardness of teeth

    • What are the principal considerations for any amalgam?

  • The amount of copper in the final restoration and the type of wear resistance
  • The amount of mercury in the final restoration and the type of reaction products formed (correct)
  • The type of reaction products formed and the compressive strength of the restoration
  • The type of metals used and the color of the restoration

    • What is the setting reaction of dental amalgam?

  • Involves mercury, which creates compressive strength and hardness
  • Involves copper and zinc, which creates solubility and fluidity
  • Involves silver and tin, which creates wear resistance
  • Involves mercury, silver, tin, copper, and zinc, which creates solubility, fluidity, and increases strength and hardness (correct)

    • What is the difference between low-copper and high-copper dental amalgam?

    <p>Low-copper dental amalgam undergoes penetrating corrosion, while high-copper dental amalgam replaces tin-mercury phase with copper-tin</p> Signup and view all the answers

    What is amalgam creep or mercurioscopic expansion?

    <p>A type of electrochemical corrosion that leads to amalgam contraction</p> Signup and view all the answers

    What are the potential sources of mercury vapor in the clinic?

    <p>Amalgam raw materials, mixed but unhardened amalgam, amalgam scrap, amalgam undergoing finishing and polishing, and amalgam restorations being removed</p> Signup and view all the answers

    What are the recommended precautions for dental professionals to minimize exposure to mercury vapor?

    <p>Use absorbent floor coverings, avoid skin contact, and use high-volume evacuation when finishing or removing amalgam</p> Signup and view all the answers

    What is the half-life of circulating mercury in the body?

    <p>55 days</p> Signup and view all the answers

    What is dental amalgam?

    <p>A type of alloy made by mixing mercury with silver tin</p> Signup and view all the answers

    What are the principal considerations for any amalgam?

    <p>The amount of mercury in the final restoration and the type of reaction products formed</p> Signup and view all the answers

    What is the setting reaction of dental amalgam?

    <p>Involves mercury, silver, tin, copper, and zinc, which creates solubility, fluidity, and increases strength and hardness</p> Signup and view all the answers

    What is the difference between low-copper and high-copper dental amalgam?

    <p>Low-copper dental amalgam undergoes penetrating corrosion, while high-copper dental amalgam replaces tin-mercury phase with copper-tin</p> Signup and view all the answers

    What is amalgam creep or mercurioscopic expansion?

    <p>A type of electrochemical corrosion that leads to amalgam contraction</p> Signup and view all the answers

    What are the potential sources of mercury vapor in the clinic?

    <p>Amalgam raw materials, mixed but unhardened amalgam, amalgam scrap, amalgam undergoing finishing and polishing, and amalgam restorations being removed</p> Signup and view all the answers

    What are the recommended precautions for dental professionals to minimize exposure to mercury vapor?

    <p>Use absorbent floor coverings, avoid skin contact, and use high-volume evacuation when finishing or removing amalgam</p> Signup and view all the answers

    What is the half-life of circulating mercury in the body?

    <p>55 days</p> Signup and view all the answers

    What is dental amalgam?

    <p>A mixture of metals including silver, tin, copper, and zinc</p> Signup and view all the answers

    What are the principal considerations for any dental amalgam?

    <p>The amount of mercury in the final restoration and the type of reaction products formed</p> Signup and view all the answers

    What factors affect the contraction and expansion of dental amalgam?

    <p>Particle size, Hg/alloy ratio, trituration time, and condensation</p> Signup and view all the answers

    What is the difference between low-copper and high-copper dental amalgam?

    <p>Low-copper dental amalgam undergoes penetrating corrosion, while high-copper dental amalgam replaces tin-mercury phase with copper-tin, which is much less corrosion-prone</p> Signup and view all the answers

    What are the properties of dental amalgam?

    <p>High thermal and electrical conductivity, high compressive strength, low tensile strength, high wear resistance, and is non-adhesive</p> Signup and view all the answers

    What should dental professionals do to manage potential sources of mercury vapor in the clinic?

    <p>Work in well-ventilated spaces with outside exhaust, periodically check the dental operatory atmosphere for mercury vapor, use non-absorbent floor coverings, and use only pre-capsulated alloys</p> Signup and view all the answers

    What should be done with scrap amalgam?

    <p>It should be stored in a tightly closed container with radiographic fixer solution and recycled</p> Signup and view all the answers

    What are the potential health risks associated with dental amalgam?

    <p>Mercury vapor can be hazardous if not managed properly, and sources of mercury in the clinic include amalgam raw materials, mixed but unhardened amalgam, amalgam scrap, amalgam undergoing finishing and polishing, and amalgam restorations being removed</p> Signup and view all the answers

    Study Notes

    Introduction to Dental Amalgam Restorations

    • Dental amalgam is an alloy made by mixing mercury with silver tin dental amalgam alloy, to which varying amounts of copper and zinc are added.

    • Amalgam alloy particles mixed with mercury produce a matrix of mercury reaction products surrounding residual dental amalgam alloy particles before and after reaction.

    • Dental amalgam is classified according to copper content, particle geometry, and zinc content.

    • The principal considerations for any amalgam are the amount of mercury in the final restoration and the type of reaction products formed.

    • Most contemporary mixtures are made with 45-55% initial mercury and end up with about 42% after the reaction and condensation steps are complete.

    • The setting reaction of dental amalgam involves silver, tin, copper, zinc, and mercury, which creates solubility, fluidity, and increases strength and hardness.

    • Low-copper dental amalgam undergoes penetrating corrosion, while high-copper dental amalgam replaces tin-mercury phase with copper-tin, which is much less corrosion-prone.

    • Amalgam contraction and expansion depend on reaction variables such as particle size, Hg/alloy ratio, trituration time, and condensation.

    • Amalgam has high thermal and electrical conductivity, high compressive strength, low tensile strength, high wear resistance, and is non-adhesive.

    • Dental amalgam restorations undergo both chemical and electrochemical corrosion, with electrochemical corrosion leading to amalgam creep or mercurioscopic expansion.

    • Mercury toxicity and hypersensitivity are minimal, and amalgam restorations have low biocompatibility with the pulp.

    • Mercury vapor can be hazardous if not managed properly, and sources of mercury in the clinic include amalgam raw materials, mixed but unhardened amalgam, amalgam scrap, amalgam undergoing finishing and polishing, and amalgam restorations being removed.Mercury and Dental Mercury Hygiene Recommendations

    • Mercury is a naturally occurring element that can exist in various forms, including organic and inorganic.

    • Dental amalgam, a mixture of metals that includes mercury, has been used for more than 150 years to fill cavities.

    • Dental amalgam releases a small amount of mercury vapor, which can be inhaled and potentially cause health problems.

    • The amount of mercury vapor released from dental amalgam varies depending on factors such as the age of the filling and the temperature of the filling.

    • Organic mercury is readily absorbed in the GI tract, while inorganic mercury is not practically absorbed in the lungs.

    • Mercury does not collect irreversibly in human tissues, and on average, the half-life of circulating mercury in the body is 55 days.

    • Dental professionals should be aware of the potential sources of mercury vapor and work in well-ventilated spaces with outside exhaust.

    • Periodic checks of the dental operatory atmosphere for mercury vapor should be conducted.

    • Non-absorbent floor coverings should be used, and only pre-capsulated alloys should be used.

    • Skin contact should be avoided, and high-volume evacuation should be used when finishing or removing amalgam.

    • Scrap amalgam should be stored in a tightly closed container with radiographic fixer solution and recycled.

    • Mercury-contaminated materials should not be placed in medical waste bags as they will be burned, potentially vaporizing mercury.

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    Related Documents

    Introduction To Amalgam Restorations PDF

    Description

    Test your knowledge on dental amalgam restorations and mercury hygiene with this quiz. Learn about the composition of dental amalgam, the setting reaction, and the factors that affect its contraction and expansion. Discover the potential sources of mercury vapor in the dental clinic and the recommended practices for managing them. This quiz is perfect for dental professionals who want to stay up-to-date on the latest information on dental amalgam and mercury hygiene.

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