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  Method for the electrophoretic coating of dental substratesUSPTO Application #: 20070029199Title: Method for the electrophoretic coating of dental substrates Abstract: The coating of dental substrates, such as the stumps of a working model or implants including ceramics, e.g. alumina, by means of electrophoresis results, especially because of the production of gas, in products unfit for use. It is therefore the aim of the invention to provide a coating method that allows for a high-quality coating of dental substrates in the shortest time possible, irrespective of the material constitution of the substrate. According to the inventive method, the substrate (stump 2) is fixated in an insulating mass (3) in a vertical holder (1). The substrate is coated with a separating agent and a hygroscopic layer and a further layer is applied thereon by shortly dipping the stump into the slip (6). The current used for electrophoresis is supplied via the layer (7) so formed. The inventive method, when used for non-conducting substrates, requires no silver enamel or the like. The method can also be used for conducting substrates, e.g. titanium implants, as the current flows only via the layer (7). (end of abstract) Agent: Kremblas, Foster, Phillips & Pollick - Reynoldsburg, OH, US Inventor: Stefan Wolz USPTO Applicaton #: 20070029199 - Class: 204471000 (USPTO) Related Patent Categories: Chemistry: Electrical And Wave Energy, Non-distilling Bottoms Treatment, Electrophoresis Or Electro-osmosis Processes And Electrolyte Compositions Therefor When Not Provided For Elsewhere, Coating Or Forming Of Object The Patent Description & Claims data below is from USPTO Patent Application 20070029199. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCES TO RELATED APPLICATIONS [0001] This application is a submission to enter the national stage under 35 U.S.C. 371 for international application number PCT/DE2004/001792/ having international filing date 10 Aug. 2004, for which priority was based upon patent application 103 39 603.9 having a filing date of 28 Aug. 2003 in Germany. (c) STATEMENT REGARDING FEDERALLY-SPONSORED RESEARCH AND DEVELOPMENT [0002] (Not Applicable) (d) REFERENCE TO AN APPENDIX [0003] (Not Applicable) (e) BACKGROUND OF THE INVENTION [0004] 1. Field of the Invention [0005] This invention relates to the coating of a ceramic on a dental substrate by electrophoresis in an aqueous slip. [0006] 2. Description of the Related Art [0007] A method is already known from DE 27 05 770 A1 in which an opaque substance from a metal alloy is applied to a substrate (cap) by electrophoresis. The opaque mass is suspended in water so that an aqueous slip is therefore used here. This method has presumably not gained acceptance in practice because of a lack of strength. [0008] A substrate according to the invention is understood to mean any article in dental technology on which a ceramic material is applied. [0009] In the 20-year younger WO 99/50 480 A1, the idea of electrophoresis was taken up again. Here, the inventor became convinced that aqueous suspensions are not suitable for electrophoresis because of formation of hydrogen bubbles, and consequently, the patent teaches work with organic suspensions that, apart from other disadvantages, require significantly higher voltage (50-400 V). According to the single example in this document, a slurry of alumina and ethyl alcohol was produced to make a cap. A duplicate of a tooth stump coated with a silver coating is coated electrophoretically at 100 V and the produced cap then sintered. After sintering, electrophoretic application of glass powder occurs, which, after 5 hours of drying, has infiltrated into the alumina mass. [0010] According to DE 100 214 37 A1, conventional aqueous slips of dental technology are used to produce fully ceramic substructures, especially alumina caps. In this case, the stump of a working model is coated with a separating agent, on which a silver coating according to the practical example is applied. The solids of the slip are electrophoretically precipitated on the silver coating by application of a voltage. [0011] This method has the advantage over the method of WO 99/50480 A1 in that it operates without duplication. It is therefore less time-consuming, has lower material costs, avoids possible errors by eliminating duplication, and requires less time. In addition, water as a suspension agent is not a hazard to health nor is it an explosive, and it permits more rapid transport of ceramic particles. Application of the infiltration glass in WO 99/55480 by electrophoresis is also very troublesome. [0012] A common feature of both instructions, however, is the disadvantageous use of silver lacquer, since experience has shown that an imprecise fit results, in addition to the increased time and material demands. During firing, vapors that are hazardous to health and non-biocompatible residues are also formed, which must be removed from the sintered ceramic in time-consuming fashion. The silver lacquer also has a tendency toward uncontrolled bubble formation. The use of a silver lacquer is fully unsuitable if the ceramic material applied by electrophoresis is to remain on the substrate, as is the case during application of a dentin or cutting mass, since in addition to mechanical weakening, unacceptable visual properties result. [0013] The task of the invention stated in claim 1 is therefore to provide a method that permits electrophoretic coating of dental substrates with the highest precision in the shortest time. [0014] Advantageous variants are described in the dependent claims. (f) BRIEF SUMMARY OF THE INVENTION [0015] The invention is a method for coating dental substrates with a ceramic by electrophoresis in an aqueous slip and is especially for coating a stump of a working model or an implant abutment with alumina or zirconia. The substrate is fixed in a vertically moving holder in an insulating mass and is coated with a separation agent. A hygroscopic salt layer is applied onto the separation agent. The coated region is dipped into the slip and then the substrate is pulled out from the slip far enough so that, during subsequent application of a voltage, only the part of the substrate to be coated with the ceramic is situated in the slip. (g) BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS [0016] The method according to the invention is explained below by means of two drawings. In the drawings: [0017] FIG. 1 shows the production of a cap, [0018] FIG. 2 shows coating of an implant abutment. Continue reading... Full patent description for Method for the electrophoretic coating of dental substrates Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Method for the electrophoretic coating of dental substrates patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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