1 / 10

KOMPOSISI AMALGAM

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.

clem
Télécharger la présentation

KOMPOSISI AMALGAM

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. KOMPOSISI AMALGAM Endanus Harijanto

  2. 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”

  3. 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

  4. 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

  5. Composition

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

  7. Symbols of Phases

  8. 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.

  9. 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.

  10. Ada Pertanyaan ?

More Related