Abrading – Flexible-member tool – per se
Reexamination Certificate
1999-07-13
2001-07-03
Rachuba, M. (Department: 3724)
Abrading
Flexible-member tool, per se
C451S533000, C451S539000, C451S541000, C451S544000, C451S548000, C433S134000, C433S165000, C433S166000, C051S299000
Reexamination Certificate
active
06254468
ABSTRACT:
FIELD OF THE INVENTION
The present invention refers to a method for the manufacture of dental tools for the treatment of surfaces, more particularly comprising a rubber-elastic mass in which the abrasive grains are enclosed.
The present inventions refers also to a method for the manufacture of dental tools for different treatments of surfaces, more particularly for coarse grinding, finishing, and polishing, comprising at least one abrasive portion in which the abrasive grains are enclosed, as well as to tools manufactured according to the method.
The present invention particularly refers to dental tools for finishing and polishing ceramic or composite surfaces of tooth fillings.
BACKGROUND OF THE INVENTION
Generally, for the coarse treatment and for finishing or polishing the surfaces of ceramic or composite fillings, dental tools, hereinafter called rubber polishers or polishers for the sake of simplicity, are used which comprise a rubber-elastic mass in which abrasive grains are embedded. According to the fineness of the grain, these tools are used for the coarse treatment or for finishing or polishing operations. The size of grain ranges from approx. 320 &mgr; down to 5 &mgr;.
Usually, the application of rubber polishers is recommended between the coarse treatment and the final high polishing. In the case of metal, high gloss may even be obtained with rubber polishers alone. The rubber polishers have different typical shapes which are determined by the anatomic structure and the specific morphology of the polished teeth and replacements such as fillings. These typical shapes in turn are subject to wear according to typical abrasion patterns. If the abrasion exceeds a certain degree, the polisher becomes useless and has to be replaced by a new one. Depending on the typical shape, the worn portions represent a greater or smaller part of the entire polisher.
The abrasive properties of the polishers are achieved by embedding abrasive grains in the rubber-elastic mass. In all tools of the prior art, the entire polishing mass is filled with abrasive grains regardless of the portions of the polisher which are typically used or not. Particularly if diamond grains are used, this leads to relatively expensive tools.
SUMMARY OF THE INVENTION
On the background of this prior art, it is a first object of the invention to provide a method for the manufacture of dental tools, and dental tools manufactured according to the method which offer a substantial economy as compared to known methods and tools. This object is attained by a method wherein a carrier layer is first applied to the spindle of the tool, and the abrasive layer comprising abrasive grains is subsequently applied to the carrier layer.
Rubber polishers have various typical shapes which are determined by the anatomical structures and the specific morphology of the polished teeth and replacements. According to the prior art, the varying abrasive properties of rubber polishers for dentistry and dental technique are determined by abrasive grains of varying size. However, this principle only works if the rubber matrix of the polishers has a certain hardness. Therefore, rubber polishers of the prior art always have a minimal hardness, which is disadvantageous especially for clinical dental applications. The friction of the dental tool on the tooth and thus its heating are inconveniently high, its adjustment to the surface is insufficient, and the abrasion of the polishers is increased.
On the background of this prior art, it is another object of the invention to simplify the method for the manufacture of dental tools and to avoid the described drawbacks. This object is attained by a method wherein rubber-elastic masses of different degrees of hardness are used for the abrasive parts of the tools according to the intended treatment, and abrasive grains of the same size are embedded in the rubber-elastic masses of said parts. The solution according to this method is based upon the discovery that the abrasive properties of abrasive grains are not so much a function of the grain size but rather of the support, i.e. of the rubber-elastic mass in which the grains are embedded.
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Gozzi Guido
Rupf Heinrich
Von Weissenfluh Beat A.
Identoflex AG
Rachuba M.
Young & Thompson
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