Method of manufacturing ceramic tooth restorations

A - Human Necessities – 61 – C

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A61C 5/10 (2006.01) A61C 13/00 (2006.01) A61C 13/083 (2006.01)

Patent

CA 2163792

The present invention relates to a method of manufacturing artificial tooth restorations for natural teeth or implants comprising a ceramic densely sintered high strength individual core (B) with dental porcelain (A) by powder metallurgical manufacturing methods. The inner surface (I) of the core (B), which will fit against one or more prepared tooth surfaces (P) or artificial abutments is manufactured by forming a ceramic powder mixture against a surface of a body at which said surface is manufactured by registering the surfaces of the prepared teeth or artificial abutments and their mutual relationship with a three dimensional optical or mechanical reading method directly in the mouth or on a model in e.g. plaster after which the registered surfaces are reproduced in an enlarged size e.g. with a computer controlled milling machine at which the enlargement is calculated from the shrinkage of the ceramic material during sintering to full density and condidering the gap for cement.

L'invention concerne un procédé de production de reconstitutions de dents artificielles pour des dents naturelles ou des implants, comprenant une âme individuelle (B) en céramique de haute résistance frittée de manière dense, présentant de la porcelaine dentaire (A), selon des procédés de production de métallurgie des poudres. La surface interne (I) de l'âme (B), laquelle vient s'adapter contre une ou plusieurs surfaces (P) de dents ou piliers artificiels préparées, est produite par formation d'un mélange de poudre céramique contre une surface d'un corps sur laquelle ladite surface est produite par alignement des surfaces des dents préparées ou des piliers artificiels et de leur relation mutuelle avec un procédé de lecture optique ou mécanique tridimensionnel directement dans la bouche ou sur un modèle, par exemple un plâtre, après quoi les surfaces alignées sont reproduites à une taille agrandie, par exemple avec une machine de fraisage commandée par ordinateur sur laquelle l'agrandissement est calculé à partir du rétrécissement du matériau céramique pendant le frittage à pleine densité, et en prenant en considération l'espace reservé au ciment.

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