Examination of the Iraqi– product lathe–cut dental amalgam alloy by using Taha Indicator. Microscopic investigation

Rejab, Lamia T; Hasan, Nadia H; Kazanji, Munther N

doi:10.33899/rden.2004.164885

Cited by 1 publication

(2 citation statements)

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“…In the early stages, copper-containing silver coin was amalgamated and used for the restoration of teeth cavities [1]. Later on, two main types of powders with various particle shapes were existed; lathe-cut and spherical alloys, which in turn also classified according to their copper content; either low or high [2]. Many studies were noticed that all the properties were improved using spherical or admixed powders [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Later on, two main types of powders with various particle shapes were existed; lathe-cut and spherical alloys, which in turn also classified according to their copper content; either low or high [2]. Many studies were noticed that all the properties were improved using spherical or admixed powders [1][2][3]. Moreover increasing copper content in amalgam alloys attracts more interest due to the improvement of strength and corrosion resistance in addition to the fact that partial silver replacement by copper lowering the cost of these alloys to a desired limits [4].…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Characterization of High-Copper Restorative Dental Alloys Corrected

Sarraj

Atiyah

2011

AMR

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A series of restorative dental alloys related to the ternary system Ag-Sn-Cu were prepared using high purity 99.99% elemental constituents. The effect of increasing the copper concentration on the micro-structural and mechanical properties of conventional dental amalgam alloy was investigated. Copper content was varied in the range of 10-30wt% and that of silver in the range of 40-60wt%, while tin percentage was kept constant between 28-30wt%. Selected desired compositions were weighed, melted, and homogenized for 1h in fused-alumina crucible using wire-resistance tube furnace at 1100oC under an inert atmosphere of argon gas. Two types of alloys were prepared, the first one was by quenching in water the alloy melt from a peak temperature of 725oC, while the second type was by slow furnace-cooling of the melt down to the room temperature. Annealing of the alloys at 350- 400oC for 24 hrs was also conducted to enhance the growth of the γ-phase. The resultant alloys were then cooled to room temperature (R.T) and milled mechanically to obtain a powder having particles sizes in the range between 30-80μm. The resultant powdered alloys was then stress-relieved at 100oC for 1h. XRD analysis, optical microscopy, micro hardness, and compression strength tests were all used for the characterization and properties determination at different Cu-concentrations for the as-prepared and amalgamated alloys in addition to the powders.. The obtained relative values for the above-mentioned properties were closely related to those listed in the literatures and lies between those of mechanically-milled and those of spherical particles. Also the γ2 – phase was disappeared at high copper content of > 20wt%.

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Section: Introductionmentioning

confidence: 99%