30 Questions
What is the technical definition of amalgam?
An alloy of mercury with any other metal
Which classification of dental amalgam is based on the number of alloy metals?
Binary, ternary, and quarternary
Which type of dental amalgam powder particle shape is a combination of spherical and lathe cut?
Admixed
What is the copper content of a high copper content dental amalgam alloy?
More than 10%
Which generation of dental amalgam is a ternary alloy with 24% copper?
Fourth generation
Which classification of dental amalgam is based on the presence or absence of zinc?
According to presence of zinc
Which component of amalgam is responsible for delayed expansion caused by moisture contamination?
Mercury
What is the term used to describe the plastic deformation of amalgam under stress?
Flow
Which of the following is not a factor limiting the long-term use of amalgam restorations?
Sensitivity
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?
Electrochemical corrosion
Which element in amalgam alloys prevents oxidation of other elements and causes delayed expansion?
Mercury
What is the purpose of the adhesive used to connect amalgam and composite resin?
To improve the interfacial bond between amalgam and resin composite
What is the primary reason for not removing the roughness on the surface of an amalgam filling?
All of the above
Which of the following is NOT a physical property listed by the ADA specification No. 1 for amalgam as a measure of quality?
Tensile strength
Which of the following statements about the compressive strength of amalgam is TRUE?
The compressive strength should be at least 310 MPa for a satisfactory amalgam restoration.
What is the relationship between tensile strength and cavity design for amalgam restorations?
Cavity design should be constructed to reduce tensile stresses resulting from biting forces.
Which of the following statements about the factors affecting the strength of amalgam is TRUE?
Both B and C are true.
What is the importance of high early tensile strengths for amalgam restorations?
They help resist fracture by prematurely applied biting forces.
What is the term used to describe time-dependent plastic deformation in dental amalgam restorations?
Creep
Which factor influences the creep rates of amalgam restorations by increasing with larger g1 volume fraction?
Phases of amalgam restorations
What causes the reduction of creep rates in a single composition alloy if g2 is absent?
Presence of h phase
How can manipulation affect the creep rates of amalgam restorations?
Greater compressive strength
What happens to the creep rates with a low mercury: alloy ratio and greater condensation pressure?
Decrease in the creep rate
What property is associated with an increase in porosity and reduced marginal integrity in dental amalgam restorations?
'Corrosion'
What is the purpose of trituration?
To mix the amalgam alloy particles with mercury
What are the consequences of over-trituration?
The alloy becomes hot, shiny, and soft
Which of the following is NOT a characteristic of under-trituration?
The resistance of the amalgam is increased
What is the appropriate speed range for high-speed trituration?
40-4400 cpm
Which of the following is NOT an objective of trituration?
To increase the amount of $\gamma_1$ or $\gamma_2$ matrix crystals
What is the appropriate time range for trituration?
3-30 seconds
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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