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Bahan / Isi Amalgam Bahan Dasar Bahan lain Silver Tin Copper Mercury
Zinc Indium Palladium Endanus Harijanto 1
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Bahan Dasar (1) Silver (Ag) Tin (Sn) increases strength
increases expansion Tin (Sn) decreases expansion decreased strength increases setting time 2
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Bahan Dasar (2) Copper (Cu) ties up tin increases strength
reducing gamma-2 formation increases strength reduces tarnish and corrosion reduces creep reduces marginal deterioration 3
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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 4
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Bahan Dasar (4) Cairan logam merkuri berwarna putih keperak-perakan
Bentuk logam valensi 0 Formula umum senyawa valensi 2 HgX2 Senyawa merkuro Hg2X2
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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 > 2 atom C mis: fenilmerkuri khlorida (C6H5-Hg-Cl)
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Bahan Lain (6) Zinc (Zn) Þ 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 H2O + Zn ZnO + H2 Þ 7
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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 8
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Bahan Lain Palladium (Pd) reduced corrosion greater luster 9
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