Bahan / Isi Amalgam

1
Bahan / Isi Amalgam

• Bahan Dasar
• Silver
• Tin
• Copper
• Mercury
• Bahan lain
• Zinc
• Indium
• Palladium

Endanus Harijanto
2
Bahan Dasar (1)

• Silver (Ag)
• increases strength
• increases expansion
• Tin (Sn)
• decreases expansion
• decreased strength
• increases setting time

3
Bahan Dasar (2)

• Copper (Cu)
• ties up tin
• reducing gamma-2 formation
• increases strength
• reduces tarnish and corrosion
• reduces creep
• reduces marginal deterioration

4
Bahan Dasar (3)

• Mercury (Hg)
• activates reaction
• only pure metal that is liquid at room
  temperature
• spherical alloys
• require less mercury
• smaller surface area easier to wet
• 40 to 45 Hg
• admixed alloys
• require more mercury
• lathe-cut particles more difficult to wet
• 45 to 50 Hg

5
Bahan Dasar (4)

• Cairan logam merkuri berwarna putih
  keperak-perakan
• Bentuk logam valensi 0
• Formula umum senyawa valensi 2 HgX2
• Senyawa merkuro Hg2X2

6
Bahan Dasar (5)

• Merkuri berbahaya terhadap kesehatan ok
• Senyawa merkuri dapat membentuk ikatan dengan
  ligan organik
• Ikatan kuat jika ligannya kelompok Metil (CH3)
• Ikatan tidak begitu stabil jika ligannya kelompok
  Etil (CH2CH3)
• Ikatan tidak stabil jika radikalnya berisi gt 2
  atom C mis fenilmerkuri khlorida (C6H5-Hg-Cl)

7
Bahan Lain (6)

• Zinc (Zn)
• used in manufacturing
• decreases oxidation of other elements
• sacrificial anode
• provides better clinical performance
• less marginal breakdown
• Osborne JW Am J Dent 1992
• causes delayed expansion with low Cu alloys
• if contaminated with moisture during condensation
• Phillips RW JADA 1954

8
Bahan Lain

• Indium (In)
• decreases surface tension
• reduces amount of mercury necessary
• reduces emitted mercury vapor
• reduces creep and marginal breakdown
• increases strength
• must be used in admixed alloys
• example
• Indisperse (Indisperse Distributing Company)
• 5 indium

9
Bahan Lain

• Palladium (Pd)
• reduced corrosion
• greater luster

10

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