Alloys or metallic compositions – Mercury base – Silver containing
Reexamination Certificate
1998-08-13
2001-02-20
Sheehan, John (Department: 1742)
Alloys or metallic compositions
Mercury base
Silver containing
C420S526000
Reexamination Certificate
active
06190606
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the field of dentistry and to improved amalgamating methods and amalgam forming compositions for the preparation of dental amalgams used to fill dental cavities.
BACKGROUND OF THE INVENTION
To facilitate a better understanding for the background of the present invention and the invention itself, the following definitions are hereby provided:
Amalgamating Composition—One or more amalgamating alloys, metals and/or intermetallic compounds or combinations thereof, that upon trituration with an Amalgamable Composition (see below), produce an amalgam (see below).
Amalgamable Composition—One or more amalgamable alloys, metals and/or intermetallic compounds or combinations thereof, that upon trituration with an Amalgamating Composition (see above), produce an amalgam (see below).
Amalgam Forming Composition—A composition that forms an amalgam upon trituration. Such compositions comprise an Amalgamating Composition (see above), until now for the most part, usually liquid mercury, and an Amalgamable Composition (see above). Such amalgams are in wide use in the field of dentistry.
The usual material used for filling dental cavities is based on amalgam obtained when suitable alloys, usually silver based, are triturated with inercury. The alloys so used are referred to herein as amalgamable materials. While the mercury so used, is referred to as an amalgamating material, other amalgamating materials, for the most part based on liquid combinations of indium and mercury, have also been described.
In an earlier patent application, now published as PCT/IL96/00167, there is described improved compositions for the formation of dental amalgams. The improvements in the said compositions were based on the development and utilization of improved amalgamable alloys and combinations of metals, as well as the use of liquid indium-mercury combinations mentioned above.
The information and disclosures of PCT/IL96/00167 are included herein by reference.
The usual liquid mercury and liquid mercury based amalgamating alloys are clumsy to handle, likely to spill and are not easy to recover, should a spill occur.
SUMMARY DESCRIPTION
The present invention provides new, totally solid, amalgamating compositions. The invention also provides new, totally solid, amalgam forming compositions. The amalgamating compositions and the amalgam forming compositions of the present invention, as well as their component compositions, may also comprise additional components, that can enhance the properties of the amalgams produced by them or facilitate the amalgam forming reaction.
The solid amalgam producing and amalgamating alloys and combinations so provided, as well as the solid dental amalgams forming compositions comprising them, are easy to handle, less likely to spill and are easy to recover, should a spill occur. In addition, the amalgam producing compositions when triturated per se and the amalgamating alloys and combinations when triturated with suitable amalgamable materials, form conveniently workable plastic amalgams, that upon application to dental cavities set in due course to stable, durable and effective dental fillings.
The solid amalgamating compositions of the present invention are readily converted to dental amalgams, by simple trituration with amalgamable materials.
The solid amalgam forming compositions of the present invention are readily converted to dental amalgams, by simple trituration.
It is an object of certain aspects of the present invention to provide solid amalgamating compositions that form denial amalgams upon trituration with suitable amalgamable compositions.
Consequently, it is also an object of certain aspects of the present invention to provide solid dental amalgam forming compositions, that form workable dental amalgam upon trituration.
It is yet a further object of certain aspects of the present invention to provide improved solid amalgam forming compositions and amalgamating compositions that are easy to handle and relatively easy to recover if inadvertently spilled.
It is yet a further object of certain aspects of the present invention to provide solid amalgamating compositions that upon trituration with amalgamable compositions provide conveniently workable plastic dental amalgam.
It is yet a further object of certain aspects of the present invention to provide solid amalgamating compositions that upon trituration with amalgamable compositions and insertion in dental cavities, harden within a relatively short time to produce chemically and mechanically stable fillings with acceptable or improved effective performance lifetime.
It is yet a further object of certain aspects of the present invention to provide solid dental amalgam forming compositions that upon trituration provide conveniently workable plastic dental amalgam.
It is yet a further object of certain aspects of the present invention to provide solid dental amalgam forming compositions that after trituration and insertion in dental cavities, harden within relatively short time to produce chemically and mechanically stable fillings with an acceptable or improved effective performance lifetime.
It is yet a further object of certain aspects of the present invention to provide methods for producing dental amalgam based on solid amalgamating compositions or solid amalgam forming compositions that after trituration and insertion in dental cavities, harden within relatively short time to produce chemically and mechanically stable fillings with an acceptable or improved effective performance lifetime.
It is yet a further object of certain aspects of the present invention to provide dental amalgams based on solid amalgamating compositions or solid amalgam forming compositions that after trituration and insertion in dental cavities, harden within a relatively short time to produce chemically and mechanically stable fillings with an acceptable or improved effective performance lifetime.
In accordance with one aspect of the present invention, there is provided improved solid amalgamating compositions containing one or more solid amalgamating alloys, metals, and/or intermetallic combinations or combinations thereof, that upon trituration with suitable amalgamable materials produce dental amalgams and chemically and mechanically stable dental cavity fillings with acceptable or improved effective performance lifetime.
In accordance with another aspect of the present invention, there is provided a solid composition for the formation of a dental amalgam comprising;
(a)one or more solid amalgamable alloys, metals and/or intermetallic compounds or combinations thereof, and
(b) one or more solid amalgamating alloys, metals and/or intermetallic compounds or combinations thereof,
wherein the formation of the dental amalgam is effected by trituration of the solid composition.
In accordance with a further aspect of the present invention, there are provided methods for conveniently producing dental amalgams based on solid amalgamating compositions or solid amalgam forming compositions that after trituration of the amalgamating compositions with amalgamable compositions or trituration of the amalgam forming compositions per se and insertion in dental cavities, the dental amalgams so produced harden within a relatively short time to produce chemically and mechanically stable fillings with an acceptable or improved effective performance lifetime.
In accordance with a further aspect of the present invention, there is provided dental amalgams produced from solid amalgamating compositions or solid amalgam forming compositions that after trituration of the amalgamating compositions with amalgamable compositions or trituration of the amalgam forming compositions per se and insertion in dental cavities, the dental amalgams so produced harden within relatively short time to produce chemically and mechanically stable fillings with an acceptable or improved effective performance lifetime.
DETAILED DESCRIPTION OF THE INVENTION AND EXAMPLES
The present invention provides improved solid amalgamating compos
Kaufman Alberto
Kopeliovich Baruch
Zalsman Moshe
Clarke Dennis P.
Miles & Stockbridge
Sheehan John
Silmet Ltd.
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