3)Dental Amalgam Terminology Quiz
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Questions and Answers

What is the technical definition of amalgam?

  • A silver-tin-copper alloy
  • A silver-tin alloy with copper and zinc added
  • A silver-tin-copper-indium alloy
  • An alloy of mercury with any other metal (correct)

    • Which classification of dental amalgam is based on the number of alloy metals?

  • Binary, ternary, and quarternary (correct)
  • Regular cut, fine cut, and microfine cut
  • Spherical, lathe cut, and admixed
  • Low copper content and high copper content

    • Which type of dental amalgam powder particle shape is a combination of spherical and lathe cut?

  • Spherical shape
  • Regular cut
  • Lathe Cut shape
  • Admixed (correct)

    • What is the copper content of a high copper content dental amalgam alloy?

    <p>More than 10%</p> Signup and view all the answers

    Which generation of dental amalgam is a ternary alloy with 24% copper?

    <p>Fourth generation</p> Signup and view all the answers

    Which classification of dental amalgam is based on the presence or absence of zinc?

    <p>According to presence of zinc</p> Signup and view all the answers

    Which component of amalgam is responsible for delayed expansion caused by moisture contamination?

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

    What is the term used to describe the plastic deformation of amalgam under stress?

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

    Which of the following is not a factor limiting the long-term use of amalgam restorations?

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

    The formation of a lack film on the surface as a result of the corrosion of sulphides in amalgam restorations is an example of which type of corrosion?

    <p>Electrochemical corrosion</p> Signup and view all the answers

    Which element in amalgam alloys prevents oxidation of other elements and causes delayed expansion?

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

    What is the purpose of the adhesive used to connect amalgam and composite resin?

    <p>To improve the interfacial bond between amalgam and resin composite</p> Signup and view all the answers

    What is the primary reason for not removing the roughness on the surface of an amalgam filling?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is NOT a physical property listed by the ADA specification No. 1 for amalgam as a measure of quality?

    <p>Tensile strength</p> Signup and view all the answers

    Which of the following statements about the compressive strength of amalgam is TRUE?

    <p>The compressive strength should be at least 310 MPa for a satisfactory amalgam restoration.</p> Signup and view all the answers

    What is the relationship between tensile strength and cavity design for amalgam restorations?

    <p>Cavity design should be constructed to reduce tensile stresses resulting from biting forces.</p> Signup and view all the answers

    Which of the following statements about the factors affecting the strength of amalgam is TRUE?

    <p>Both B and C are true.</p> Signup and view all the answers

    What is the importance of high early tensile strengths for amalgam restorations?

    <p>They help resist fracture by prematurely applied biting forces.</p> Signup and view all the answers

    What is the term used to describe time-dependent plastic deformation in dental amalgam restorations?

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

    Which factor influences the creep rates of amalgam restorations by increasing with larger g1 volume fraction?

    <p>Phases of amalgam restorations</p> Signup and view all the answers

    What causes the reduction of creep rates in a single composition alloy if g2 is absent?

    <p>Presence of h phase</p> Signup and view all the answers

    How can manipulation affect the creep rates of amalgam restorations?

    <p>Greater compressive strength</p> Signup and view all the answers

    What happens to the creep rates with a low mercury: alloy ratio and greater condensation pressure?

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

    What property is associated with an increase in porosity and reduced marginal integrity in dental amalgam restorations?

    <p>'Corrosion'</p> Signup and view all the answers

    What is the purpose of trituration?

    <p>To mix the amalgam alloy particles with mercury</p> Signup and view all the answers

    What are the consequences of over-trituration?

    <p>The alloy becomes hot, shiny, and soft</p> Signup and view all the answers

    Which of the following is NOT a characteristic of under-trituration?

    <p>The resistance of the amalgam is increased</p> Signup and view all the answers

    What is the appropriate speed range for high-speed trituration?

    <p>40-4400 cpm</p> Signup and view all the answers

    Which of the following is NOT an objective of trituration?

    <p>To increase the amount of $\gamma_1$ or $\gamma_2$ matrix crystals</p> Signup and view all the answers

    What is the appropriate time range for trituration?

    <p>3-30 seconds</p> Signup and view all the answers

    Study Notes

    Definition and Classification of Dental Amalgam

    • The technical definition of amalgam is not specified, but it can be understood as a mixture of mercury with other metals, used as a restorative material in dentistry.
    • Dental amalgam can be classified based on the number of alloy metals, with this classification type being undefined in the provided text.
    • Another classification of dental amalgam is based on the presence or absence of zinc.

    Properties and Composition of Dental Amalgam

    • High copper content dental amalgam alloy has a copper content of around 24%.
    • The generation of dental amalgam that is a ternary alloy with 24% copper is not specified.
    • Zinc is responsible for delayed expansion caused by moisture contamination in amalgam restorations.
    • The element that prevents oxidation of other elements and causes delayed expansion in amalgam alloys is zinc.

    Corrosion and Degradation of Dental Amalgam

    • The formation of a lack film on the surface as a result of the corrosion of sulphides in amalgam restorations is an example of tarnish corrosion.
    • Creep is the term used to describe time-dependent plastic deformation in dental amalgam restorations.

    Physical Properties of Dental Amalgam

    • The primary reason for not removing the roughness on the surface of an amalgam filling is not specified.
    • One of the physical properties listed by the ADA specification No. 1 for amalgam as a measure of quality is compressive strength.
    • High early tensile strengths are important for amalgam restorations to withstand occlusal forces.
    • The relationship between tensile strength and cavity design for amalgam restorations is that a conservative cavity design is recommended to minimize the stress on the restoration.
    • The factor that influences the creep rates of amalgam restorations by increasing with larger g1 volume fraction is not specified.
    • The absence of g2 can cause a reduction of creep rates in a single composition alloy.

    Manipulation and Trituration of Dental Amalgam

    • Over-trituration can cause a decrease in strength and an increase in sensitivity to moisture contamination.
    • Under-trituration can cause a decrease in strength, incomplete mercury reaction, and poor marginal adaptation.
    • The appropriate speed range for high-speed trituration is not specified.
    • The appropriate time range for trituration is around 10-15 seconds.
    • The purpose of trituration is to mix the alloy particles with mercury to form a consistent mixture.

    Other

    • The term used to describe the plastic deformation of amalgam under stress is creep.
    • The purpose of the adhesive used to connect amalgam and composite resin is not specified.

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    Dental Amalgam PDF

    Description

    Test your knowledge on the terminology related to dental amalgam, including the definition, composition, and classification of dental amalgam alloys. Explore the different classifications based on the number of alloy metals and the shape of the powdered particles.

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