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17 Cards in this Set
- Front
- Back
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2 uses of amalgam
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large, direct permanent posterior
Cores/foundation |
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Amalgam is a ___(type of metal___ which major ingredient is? and a powder of?
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alloy, mercury, Ag and Sn
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What is gamma
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Ag3Sn
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What is gamma1?
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Ag2Hg3
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What is gamma 2?
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Sn8Hg
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What is the benefit of having this in amalgam:
Ag? Sn Cu |
Ag - increase strength
Sn - decreases expansion Cu - ties up Tn to reduce Gamma2, increase strength, decrease creep, tarnih and erosion |
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What is the purpose of mercury in amalgam?
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activates the reaction
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What is the advantage of lathe-cut alloy amalgam?
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resist condensation better
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what is the advangate of spherical alloy amalgam?
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requires less mercury, therefore a better alloy
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the 2 ways of getting the amalgam reaction are Low copper and High copper. The high copper you add Ag-Cu and the advantage is:
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No gamma 2 because Sn reacts w/ Cu
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What material pretoects puplal tissue from irritation?
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Liner
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What liner is used exclusively for amalgam?
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Varnish
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What is a liner?
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material that protects puplal tissue from irritation
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What is hte purpose of a base?
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to insulate the pulp
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What is the difference between fluid flow and microleakage?
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fluid flow is associatied with SHARP PAIN caused by fluid within tubules, causing tiny pressure drops, sensed by mechanoreceptors
Microleeakge due to endotoxins producing inflammation - little pain |
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Managing inflammation. Eugenol is used to....
Dycal is used to... |
eug - ease pain/deaden sense
Dyc - promote secondary dentin |
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Mechangical protection is achieved by...and purpose is to
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Base to add strength
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