Dentistry – Method or material for testing – treating – restoring – or...
Patent
1986-11-24
1988-08-16
Swisher, Nancy A. B.
Dentistry
Method or material for testing, treating, restoring, or...
A61C 1300
Patent
active
047641177
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
This invention relates to a restorative dental material comprising a metal casting with an improved bonding surface, which material is to be fixedly adhered to one or more teeth or one or more other prosthetic appliances made of a variety of materials (noble metals, base metals, ceramics, organic macromolecular materials, etc.) in restorative dental treatment.
BACKGROUND ART
Today, metal castings such as inlays, crowns and bridges are in wide use in prosthetic restoration in dentistry. In dental treatment, such metal castings need to be fixed to teeth or other prosthetic appliances made of various materials and therefore a number of fixation methods therefor have been investigated. In particular, as a result of recent development of adhesive resins capable of adhering satisfactorily to teeth as well as to metals, the technique of effecting fixation using adhesives has attracted attention.
In the technology of adhesion fixation, the surface treatment of metal castings is important and is a decisive factor for the functional period of prosthetic appliances. Previously, the present inventors reported that provision of an electroplated tin coat on metal castings, which is to be followed by application of an adhesive onto the tin coat, is effective as such surface treatment (The Journal of the Japan Prosthodontic Society, volume 28, pages 1023-1033, 1984). However, further investigation has shown that said treatment is till unsatisfactory in respect to bond strength and long-term water resistance and, therefore, improvements are desired.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to improve the bond strength and durability of the adhesion bond between metal castings and teeth or prosthetic appliances made of various materials so that said bond can be maintained for a prolonged period of time.
Such object of the invention can be accomplished by providing a restorative dental material which is a metal casting with a plated tin coat layer containing polymer particles being formed on the bonding surface of said metal casting. Such restorative dental material can be produced by electroplating the bonding surface of a metal casting using an Sn.sup.++ -containing plating solution or bath with polymer particles dispersed therein. To the bonding surface having such polymer-containing tin plating, there is applied an adhesive composition containing, as an adhesive component, a polymerizable monomer having an acid group, and the metal casting is then firmly fixed to a tooth or teeth or some other prosthetic appliance or appliances.
BEST MODE FOR CARRYING OUT THE INVENTION
In accordance with the invention, the metal casting includes all metal castings that are casting products for dental treatment purposes, are variegated in form and shape and are to be held in position in the oral cavity of patients, more specifically inlays, onlays, crowns, bridges, clasps, splints, abutments and so forth. The metals which constitute such metal castings are, for example, noble metals such as gold, silver, platinum and palladium, precious alloys based on these noble metals (for instance, gold-based alloys, gold-palladium-silver alloys, silver-based alloys, etc.), base material such as nickel, chromium and cobalt, and nonprecious alloys based on these base metals (for example, nickelchromium alloys, cobalt-chromium alloys, etc.). Prior to electroplating, these metal castings are desirably cleaned to a sufficient extent so that investments, dirt from the hands and other contaminants can be removed, since, without cleaning, there is the possibility of plated coat layer separation. For the purpose of cleaning, there may be used brushing, sandblasting, buffing, pickling, ultrasonic cleaning, electropolishing and electrolytic cleaning, among others. The bonding surface of the metal castings which is to be subjected to electroplating is desirably sandblasted using an abrasive about 10-100 .mu.m in particle size because the resulting uneven surface remains uneven even after electroplated
REFERENCES:
patent: 3997637 (1976-12-01), Rogers
patent: 4125442 (1978-11-01), Rogers
patent: 4247575 (1981-01-01), O'Connell et al.
patent: 4295951 (1981-10-01), Bommoraju et al.
The Journal of the Japan Prosthodontic Society, vol. 28, pp. 1023-1033 (1984), Adhesive Strength of Adhesive Resin Atsushi, Yamashita, et al.
Kondo Yasuhiro
Nakai Hiroyuki
Suzuki Kazuomi
Yamami Toshiaki
Yamashita Atsushi
Kuraray Co. Ltd.
Swisher Nancy A. B.
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