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DENTMAT AMALGAM

QuestionAnswer
Most economical & popular posterior restorative material dental amalgam
when Hg is in liquid form and alloyed with a solid state metal The reaction that occurs between mercury and amalgam alloy. AMALGAMATION
Compositions of dental amalgam: Increase strength & creep; decrease flow increase expansion of amalgam Silver
principal constituent of amalgam alloy silver
Compositions of dental amalgam: responsible for low tensile strength; reduce expansion & hardness; decrease speed of ST Increase flow, corrosion resistance, contraction & creep Tin
Compositions of dental amalgam: decrease flow; increase setting expansion hardens and strengthens the Ag-Sn alloy Copper
Compositions of dental amalgam: deoxidizer, acts as a scavenger for oxygen/impurities present) increase tarnish resistance Zinc
highly toxic; very volatile, high vapor pressure; liquid at room temperature LIQUID MERCURY
Conventional : hardened metal is called as _____ ingot
Conventional, Spherical, Dispersed smooth carving; faster ST; higher flow low creep but more difficult to carve conventional alloy
Conventional, Spherical, Dispersed easy to polish and manipulate; uses less Hg; low contraction, high CS Spherical alloy
Conventional, Spherical, Dispersed has the finest particle Amalgam is more resistant to corrosion, actual deterioration of metal. Less mercury is needed, greater compressive strength, more compact filling. Dispersed alloy
Conventional or High-copper (low-Cu alloy) Easy to fracture, prone to tarnish & marginal breakdown Conventional
Conventional or High-copper most common type Increase the strength of material, less corrosion, fracture & marginal breakdown High-copper alloy
Conventional or High-copper Hg + Ag-Sn alloy = Ag-Hg + Cu-Sn + Ag-Sn-Cu High-copper alloy
Conventional or High-copper Hg + Ag-Sn alloy = Ag-Sn + Ag-Hg + Sn-Hg conventional
done by rubbing the rubber dam with the mixture inside onto the palm of your hand for 30 seconds. The objective is to produce a more homogenous mass. MULLING
Procedure of bringing the amalgam into the prepared cavity. CONDENSATION
dimensional change that occurs under load as a result of the viscoelastic properties of amalgam; is the gradual flow of a material under an applied stress. CREEP
Is a deposit of surface film that produces a discoloration; the film maybe from sulfide formation or from calculus or plaque that becomes darker the longer it remains on the surface of the restoration. TARNISH
a surface and subsurface deterioration of the restoration by chemical or electrochemical action. CORROSION
Failures in Am restorations: Improper cavity design can result to __________ or ______ recurrent caries and / or fracture
Failures in Am restorations: Dimensional changes as to expansion and contraction leading to __________ ______________ marginal breakdown
Failures in Am restorations: Subject to the effects of ____ and _____when exposed to conditions present in the oral cavity tarnish and corrosion
the procedure for mixing alloy + mercury Trituration
used in hand method mortar and pestle
Created by: nixieee
 

 



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