Method for manufacturing dental prostheses and dental auxiliary parts

Dentures, such as crowns, bridges, Inlays u. Like., Consists of regularly complex shaped articles, mostly the one hand, the spatial Configuration the preserved teeth parts (stumps), lost Gone whole teeth or parts of the jaw and on the other hand the spatial situation with respect to adjacent and / or antagonistic teeth account individually have to. According to the prior art is such dentures in complex Methods. Well the most widespread is the production the required Moldings - mostly of precious or non-precious metal alloys and pure metals - in a multistage molding and casting processes. but became famous also the data-driven milling such moldings from the solid material, which inevitably substantial waste has the consequence of reprocessed consuming must be or high cost.

aim the invention is producible another, in an advantageous way moldings show (and especially needed in implantology dental auxiliary parts). It makes use of to an otherwise, namely for the manufacture of complex tools or components under the name "Rapid Prototyping" become known method in the tablets of the from a sinterable Powders are built up in layers by successively each layer exposed to the powder a leading to local sintering energy of a laser beam is, the guide the laser beam over the respective powder layer of control by data subject, representing the configuration of the molded body in this layer. By the power supply to each affected powder ingredients are superficially melted and go together form a stable bond. by virtue of the narrow focus the laser beam can be - with high density - the energy supply very accurately configure and accordingly through the stored spatial Data of the desired molding control accordingly.

The Invention further provides that the Powder of a biocompatible material of varying Grain size between 0 and 50 microns consists. Unlike the previous application of the laser sintering process technical Applications should be ensured in this way that the for dental purposes certain moldings compatible with human tissue (See. Hoffmann-Axthelm, Dictionary of Dentistry, 6./11. Ed., P 97 and Reuling, biocompatibility dental alloys). The grain size curve guarantees particularly dense sintering with the advantage of high pressure resistance of the shaped body and less formation of voids, which for the emergence of bacterial cultures were susceptible; He also sets the dimension and precision fit the restoration firmly.

It however, is also possible, the precise local compacting the powdery Feedstock make in other ways, whether by other types Power supply or - in The case of plastics as a raw material - by localized polymerization control. In general, however, an optically focusable electromagnetic Radiation other measures - such as , to be made in a vacuum corpuscular - for power transmission be preferable.

The sintered surface of the inventive molding is as a result of their certain roughness particularly well suited for the often desired veneering by means of ceramic or other materials, as for example, with crowns or bridges the case is. Further, it is easily possible as a result of influence the - the Control effecting - file possible, make corrections to the configuration of the molding, consisting of different reasons (opposite to the scanned result) desirable may seem.

Preferably consists in the powder of an alloy of substantially the same Shares of the alloy constituents in each powder grain. This represents a big advantage over the conventional Production of dental moldings represents from molten alloys because no danger of separation of the alloy components in the melt and / or the cast Moldings composed. moreover requires the production of semi-finished products from certain alloys, the for dental purposes are used to particular advantage, complicated and expensive process steps, such as about the Saugguß, while pulverizing such alloys is much less complex. but while a melt prepared from such powders (for subsequent production of cast moldings) turn the risk of separation and is therefore subject inhomogeneity, retains an inventively sintered moldings his uniform distribution of the alloy constituents at.

For the molding of the invention has a metal powder of the following composition proved, without the invention being limited thereto: Ni61, 4Cr22, 9M08, 8Nb3, 9Fe2, 5Mn0, 4Ti0,1