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EP0033628A2
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EP
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A product to be used in dental amalgams
Assignee: MACRODENT SA
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Filing: 1981-01-27
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Granted: —
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Expires: 2001-01-27
Abstract
Abstract A new amalgamable powder is disclosed containing, in the preferred embodiment, by weight, a mixture of between 24% and 56% silver, 20% and 48% tin, and 12.5% and 43% copper, in which when the tin/copper relation is between 1 / 1 and 2.50/ 1,thesilver/tin relation is between 0.75 / 1 and 1.8 / 1, and when the tin/copper relation is between 0.75 / 1 and 1/1, the silver/tin relation is between 0.75/1 and 2.5 / 1. In the amalgamable powder at least a portion of the particles are of irregular polyhedral shape, obtained by mechanical means starting from a solid state alloy, while the remainder of the particles, if any, are spheroidal shape, obtained by rapid solidification from a liquid state. In addition, at least 80% of the particles of the powder have their largest dimension greater than 4 microns.
Inventors
- 👤 Tomas Peter Pokorni
- 👤 Daniel Eduardo Balzaretti
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 19:59
CPC Classifications
C; C22; C22C; C22C30/00; C22C30/04; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/847; C22C5/00; C22C5/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
A product to be used in dental amalgams and containing, by weight, a mixture of between 24% and 56% silver, 20% and 48% tin, and 12.5% and 43% copper, characterized in that: (a) the weight relations between such components in the final mixture are as follows: (b) at least a portion of the particles of the product are of irregular polyhedral shape, obtained by mechanical means starting from a solid state alloy and the remainder, if any, of the particles of the product are spheroidal in shape, obtained by rapid solidification from a liquid state, and (c) at least 80%, by weight, of the particles in the mixture have their largest dimension greater than 4 microns.
Claim 2
Dependent Claim
116 words
A product to be used in dental amalgams and containing, by weight, a mixture of between 24% and 56% silver, 20% and 48% tin, and 12.5% and 43% copper, characterized in that: (a) the weight relations between such components in the final mixture are as follows: (b) at least a portion of the particles of the product are of irregular polyhedral shape, obtained by mechanical means starting from a solid state alloy and the remainder, if any, of the particles of the product are spheroidal in shape, obtained by rapid solidification from a liquid state, and (c) at least 80%, by weight, of the particles in the mixture have their largest dimension greater than 4 microns.
Claim 3
Dependent Claim
49 words
A product to be used in dental amalgams, according to claim 1 containing, by weight, between 35% and 47% silver, 30% and 37% tin, and 20% and 28% copper, the weight relationship between the copper content and the tin content being greater than 0.60/1 but no greater than 0.95/1.
Claim 4
Dependent Claim
53 words
A product to be used"in dental amalgams, according to claim 1 or claim 2, further including one or more of the following elements in weight amounts of up to 2% of zinc, up to 5% of mercury, and up to 3% total of one, another, or any combination of gold, platinum and palladium.
Claim 5
Dependent Claim
37 words
A product to be used in dental amalgams, according to any one of the preceding claims characterized by the fact that spherical particles comprise 0 to 75% of the total weight of the particles in the mixture.
Claim 6
Dependent Claim
57 words
A product to be used in dental amalgams, according to any one of the preceding claims characterized by the fact that more than 95%,by weight, of the particles in the mixture have their largest dimension less than 140 microns and more than 30%,by weight, of the particles in themixture have their largest dimension larger than 44 microns.
Claim 7
Dependent Claim
71 words
A product to be used in dental amalgams, according to any one of the preceding claims, characterized by the fact that at least some of the particles in the mixture are chemically heterogeneous, the silver composition of such particles showing a variable concentration gradient from the core to the surface of the particles, and the exterior of such particles showing a higher content of silver or other precious metals or both.
Claim 8
Dependent Claim
62 words
A product to be used in dental amalgams, according to any one of the preceding claims, characterized by the fact that at least some of the particles in the mixture are superficially covered by silver, gold, palladium or platinum or by amalgamable alloys thereof, wherein these metals have an important individual participation, be it inter-alloyed or by means of another alloying element.
Claim 9
Dependent Claim
19 words
Disintegrable pellets or tables formed by the agglomeration of the product claimed in any one of the preceding claims.
Claim 10
Dependent Claim
36 words
A dental amalgam for use in dental restorations and obtained by mixing the product claimed in any one of claims 1 to 7 with mercury, the amalgam containing between 37.5% and 50% of mercury, by weight.
References Cited (Backward Citations)
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