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ALLOYS IN PROCESS OF COMPOUNDING. 249
—
Quantity of Mercury Required. 'Jlic percentage of mer-
cury used for the amalg'aiiKition of different alloys varies
with the constituents of the alloy. Sufficient mercury must
he used to satisfy the chemical affinity of the other metals,
hut if too much be used it results in a solution of the alloy.
An " aged " alloy requires less mercury than the same metal
freshly cut. From 40 to 60 per cent, of mercury is usually
employed.
Composition of Standard Alloys.—The following table,
taken from Dr. Kirk's article in the " American System
of Dentistry '' shows the composition of some of the prin-
cipal dental amalgam alloys in use:
Caulk's Par-excellence 61.75 0.15 0.25 10.60
Dawson's Superior Amalgam 63-55 0-65 0.15 2.35 1-45
Essig's Alloy 55- 2-5 2-5
Fletcher's P. and G. Alloy 50.35 3-35 1.30
Flagg's Contour Alloy 37- 5-
Globe (S. S.White's) 53-36 1.50 0.40
Hood & Reynold's G. and P. Alloy 50.40 3.80 •30
Johnson & Lund's Extra Amalgam. 61.15 -15 -50 1-45
Justi's Superior G. and P. Alloy 59.10 0.32 0.08 3-50 1.80
King' s Occidental 54.75 2.50
Lawrence' s Amalgam 50.43 5-51
Pierce's Dental Alloy 40. 4-
Sibley's G. & P. Alloy 54-65 0.20 2.00
Townsend's Improved 54-50 I.
Welche's G. and P. Alloy 51.90 1.70 .40
ALLOYS, THEIR TREATMENT AND BEHAVIOR
IN THE PROCESS OF COMPOUNDING.
General Properties.—By forming certain definite alloys
the number of useful metals has been very largely increased,
and the most useful alloys, in a commercial way, are usually
those whose constituents are most dissimilar. All alloys
possess metallic luster, are opaque, conduct heat and elec-
ALLOYS IN PROCESS OF COMPOUNDING. 249
—
Quantity of Mercury Required. 'Jlic percentage of mer-
cury used for the amalg'aiiKition of different alloys varies
with the constituents of the alloy. Sufficient mercury must
he used to satisfy the chemical affinity of the other metals,
hut if too much be used it results in a solution of the alloy.
An " aged " alloy requires less mercury than the same metal
freshly cut. From 40 to 60 per cent, of mercury is usually
employed.
Composition of Standard Alloys.—The following table,
taken from Dr. Kirk's article in the " American System
of Dentistry '' shows the composition of some of the prin-
cipal dental amalgam alloys in use:
Caulk's Par-excellence 61.75 0.15 0.25 10.60
Dawson's Superior Amalgam 63-55 0-65 0.15 2.35 1-45
Essig's Alloy 55- 2-5 2-5
Fletcher's P. and G. Alloy 50.35 3-35 1.30
Flagg's Contour Alloy 37- 5-
Globe (S. S.White's) 53-36 1.50 0.40
Hood & Reynold's G. and P. Alloy 50.40 3.80 •30
Johnson & Lund's Extra Amalgam. 61.15 -15 -50 1-45
Justi's Superior G. and P. Alloy 59.10 0.32 0.08 3-50 1.80
King' s Occidental 54.75 2.50
Lawrence' s Amalgam 50.43 5-51
Pierce's Dental Alloy 40. 4-
Sibley's G. & P. Alloy 54-65 0.20 2.00
Townsend's Improved 54-50 I.
Welche's G. and P. Alloy 51.90 1.70 .40
ALLOYS, THEIR TREATMENT AND BEHAVIOR
IN THE PROCESS OF COMPOUNDING.
General Properties.—By forming certain definite alloys
the number of useful metals has been very largely increased,
and the most useful alloys, in a commercial way, are usually
those whose constituents are most dissimilar. All alloys
possess metallic luster, are opaque, conduct heat and elec-
