KOMPOSISI AMALGAM Endanus Harijanto.

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Presentation transcript:

KOMPOSISI AMALGAM Endanus Harijanto

Amalgam Alloy Composition ANSI/ADA Spec. #1 (ISO 1559) requires that amalgam alloys be predominantly silver (Ag) and tin (Sn). containing Zn > 0.01%  “Zinc Containing” containing Zn < 0.01%  “nonzinc”

Classification Low-copper (Conventional) amalgam alloy (at least 65 wt% Ag, 29 wt% Sn, < 6 wt% Cu) lathe-cut (irregular) powder or spherical particles or mixed Ag-Sn High-copper amalgam alloy (6-60 wt% Cu) (1) Admixed (Ag-Sn + Ag-Cu) A mixture of irregular and spherical particles of different or same composition (2) Unicomposition or Single composition (Ag-Sn-Cu) All spherical particles

Classification Admixed amalgams containing 10% to 15% indium (In) in the mercury Newly developed Decreases the amount of Hg needed  decreases the Hg vapor during and after setting Low creep and lower early-compressive strengths, but higher final strengths

Composition

Lathe-cut v.s. Spherical Irregular or Lathe-cut Spherical

Phases in Amalgam Alloys and Set Dental Amalgams Symbols of Phases Phases in Amalgam Alloys and Set Dental Amalgams Formula g Ag3Sn g1 Ag2Hg3 g2 Sn7-8Hg b Ag4Sn (silver-rich) e Cu3Sn h Cu6Sn5 Silver-copper eutectic Ag-Cu

Silver-Tin (Ag-Sn) System (1) Most commercial alloys fall within the limited composition range of B to C. (b + g) and g If Sn > 26.8 wt%  g + Sn-rich phase is formed.  Sn-Hg phase (g2) in the final product which lacks corrosion resistance and is the weakest component.

Silver-Tin (Ag-Sn) System (2) 4 wt% to 5 wt% Cu is substituted for Ag. Hardens and strengthens the Ag-Sn alloy Zinc = Deoxidizer: a scavenger (O2) during melting  formation of oxides Can cause an abnormal expansion if the amalgam is condensed in the presence of moisture.

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