Method and arrangement for a dental installation

A - Human Necessities – 61 – C

Patent

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A61C 5/08 (2006.01) A61C 13/083 (2006.01) A61K 6/02 (2006.01)

Patent

CA 2538376

A substrate has or is provided on a surface with a first porosity. A dispersion with low-viscosity liquid is applied to the surface in order to form a ceramic layer with a second porosity having preferably larger and/or more pores than in the first porosity. The liquid has the ability to be sucked by capillary force into the first pore formation and, in a first stage, to retain on the surface material and/or liquid particles which do not penetrate into this first pore formation, and which contribute to the continued construction of the layer. In a second stage, the substrate is subjected to sintering in which the particles finally forming the layer are held together with intermediate spaces which consist of or are included in the second porosity, the spaces being formed either by the fact that material and liquid particles separate from the particles finally forming the layer are driven off during the sintering and/or by the fact that the particles forming the layer are chosen with a particle size which means that the last-mentioned particles are held together after the sintering despite the intermediate spaces. The invention also relates to an arrangement. By means of the invention, a dental product can be provided with excellent porosity which is advantageous in connection with dental installations.

Un substrat comporte une surface présentant une première porosité ou est prévu sur une telle surface. On applique une dispersion d'un liquide de faible viscosité sur la surface pour former une couche céramique présentant une deuxième porosité ; cette couche comporte de préférence un nombre supérieur de pores et/ou des pores de taille supérieure par rapport à ceux présentant la première porosité. Le liquide peut être aspiré par force capillaire dans la première formation de pores, et, dans un première phase, retenir sur la surface des particules solides et/ou liquides ne pénétrant pas dans cette première formation de pores et qui contribuent à former une structure continue de la couche. Au cours d'une deuxième phase, le substrat est soumis à un frittage pendant lequel les particules formant la couche finale sont maintenues ensemble avec des espaces intermédiaires, qui constituent la deuxième porosité ou sont inclus dans celle-ci ; les espaces sont formés parce que les particules solides et liquides, séparées des particules formant la couche finale, sont rejetées pendant le frittage et/ou parce que les particules formant ladite couche, choisies en raison de leur dimensions de particules, sont maintenues ensemble après le frittage malgré les espaces intermédiaires. L'invention concerne aussi un dispositif. Cette invention permet de former un produit dentaire d'excellente porosité qui s'utilise avantageusement avec des implantations dentaires.

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