DE3609432A1

DE3609432A1 - Sinterable dental impression compounds and their use

Info

Publication number: DE3609432A1
Application number: DE19863609432
Authority: DE
Inventors: Kerstin Koerber; Sebastian Koerber; Klaus Dr Ludwig
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-03-20
Filing date: 1986-03-20
Publication date: 1987-09-24

Abstract

The sinterable dental impression compounds according to the invention increase the accuracy and reduce the preparation time by omitting numerous intermediate steps in dental ceramic restorations: impressions are made of trimmed tooth stumps using a combination of materials comprising sinterable compound and a settable substance by firing, for example, a ceramic crown directly from the sinterable impression compound.

Description

Die dentale Herstellung von Restaurationen, Kronen und Brücken aus Keramik, Glas oder Porzellan erfolgt bisher dadurch, daß vom beschliffenen Zahn eine Abformung mittels spezieller Abformmasse vorgenommen wird, die danach mit einem Modellmaterial ausgegossen ein formanaloges Ebenbild des Zahnstumpfes ergibt. Auf diesem Modell wird mittels verschie dener Technologien die Keramik-, Glas- oder Porzellanmasse modelliert, abgenommen und in einem Ofen gesintert. Die Ab formung, das Ausgießen zum Modell, die Herstellung und Über tragung auf einem Modell bringt natürlich das Problem der Fehlerkette mit sich, indem sich die Fehler jedes einzelnen Schrittes addieren. Besonders ungünstig ist das freihändige Modellieren mit sinterbaren Massen auf einem mit unvermeid lichen Toleranzen behafteten Modellstumpf.The dental manufacture of restorations, crowns and Bridges made of ceramic, glass or porcelain have so far been used characterized in that an impression of the ground tooth by means special impression material is made, which then with a Model material poured out an analogue image of the same Tooth stump results. On this model is using various whose technologies are the ceramic, glass or porcelain mass modeled, removed and sintered in an oven. The Ab molding, pouring into a model, production and transfer Carrying on a model naturally brings the problem of Error chain with itself, making up the mistakes of each one Add step. This is particularly unfavorable hands-free Model with sinterable masses on one with inevitable tolerances of the model stump.

Die erfindungsgemäße, sinterbare dentale Abformmasse erlaubt es, daß ein Zahnstumpf direkt mit der Masse abgeformt wird, aus der die Restauration hergestellt werden soll. In einer bevorzugten Anwendung werden entsprechend der Anmeldung P 36 04 059.2 dünne Glas-, Keramik- oder Porzellan-Hohl kronen, die die Form und Schichtstärke des natürlichen Zahn schmelzes haben, mit der erfindungsgemäßen Abformmasse gefüllt und dem Zahnstumpf soweit aufgeschoben bis die Hohlkrone exakt im Zahnbogenverlauf steht. Nach Auslösen eines Abbindemechanismus verfestigt sich die erfindungsgemäße Masse irreversibel oder reversibel elastisch oder fest, so daß die Abformkrone abgezogen werden kann. Diese hat jetzt außen die bereits vorgegebene anatomische Form und entspricht im Innern exakt der Form des beschliffenen Zahnstumpfes. Übertragungsfehler, Fehlersummation durch bisherige Abformung und Modellherstellung und sekundäres Aufbauen auf einem Modellstumpf entfallen. Die erfindungsgemäße sinterbare, den tale Abformmasse wird auf einem speziellen Objektträger im Ofen direkt gebrannt, wobei durch Sintern die feste Innenform der Zahnrestauration entsteht. Durch Änderung des Mischungs verhältnisses der Anmischlösung wird erreicht, daß die Sin termasse Keramik, Glas oder Porzellan beim Brennen steuerbar kontrahiert, so daß ein definierter Hohlraum zwischen Innen fläche der gebrannten Sinter-Abformmasse und Oberfläche des Zahnstumpfes entsteht entsprechend der Mindestschichtstärke des gewählten Befestigungszementes. Um eine vorgefertigte Hohlkrone, die während der Abformung als Halterung dient, beim Brennen nicht berühren zu müssen, wird in einer bevorzugten Verwendung die erfindungsgemäße sinterbare den tale Abformmasse nach Abformung des beschliffenen Zahnes mit feuerfester Schamott- bzw. Löteinbettmasse ausgegossen, die dann als Formhalter und Objektträger während des Brennvor ganges dient. Zur uneingeschränkten Anwendung in der zahn ärztlichen Praxis wird bei Verwendung von glasklaren oder transparenten Formhaltern die erfindungsgemäße Abform- Sintermasse im erforderlichen Farbsortiment verwendet.The sinterable dental impression material according to the invention allows that a tooth stump is molded directly with the material, from which the restoration is to be made. In a preferred application will be according to the registration P 36 04 059.2 thin glass, ceramic or porcelain hollow crowns the shape and layer thickness of the natural tooth have melt, with the impression material according to the invention filled and pushed onto the tooth stump until the Hollow crown is exactly in the course of the dental arch. After triggering a binding mechanism solidifies the invention Mass irreversible or reversible elastic or firm, see above that the impression crown can be removed. This has now outside the already given anatomical shape and corresponds inside exactly the shape of the ground tooth stump. Transmission errors, error accumulation due to previous impressions and model making and secondary building on one Model stump is eliminated. The sinterable according to the invention, the tal impression material is placed on a special slide in the Kiln fired directly, the solid inner shape being sintered the tooth restoration arises. By changing the mix ratio of the mixing solution is achieved that the Sin Termasse ceramic, glass or porcelain controllable when firing contracted so that a defined cavity between the inside area of the fired sinter impression material and surface of the Tooth stump is created according to the minimum layer thickness of the chosen cement. To a pre-made Hollow crown, which serves as a holder during the impression, Not having to touch when burning is in one preferred use the sinterable according to the invention tal impression material after impression of the ground tooth with refractory fireclay or solder investment poured out, the then as a mold holder and slide during the firing process ganges serves. For unlimited use in the tooth medical practice will use crystal clear or transparent mold holders the impression Sintered mass used in the required color range.

Claims

1. Sinterable dental impression materials characterized in that they can be mixed from ceramic-glass-porcelain powder with a solution to form a plastic mass which, after impression taking of a prepared tooth or its model, becomes irreversible or reversibly plastic or solid by starting a setting mechanism or by suitable Additives are given their own stability, so that they are sintered in the ceramic furnace directly to a shape-analogous dental object, eg inlay, onlay, tooth crown or dental bridge, the setting substance combining with the sintered mass or burning without residue.

2. Sinterable dental impression materials characterized in that that they are mixed according to claim 1 in a thin, the natural tooth enamel simulated hollow crown (P 36 04 059.2) filled, a ground tooth pushed on bluntly and by starting the binding mechanism nism solidifies to such an extent that it is a precisely fitting impression of the tooth stump on the one hand and as a positive object on the other hand, can continue to be used.

3. Sinterable dental impression material characterized in that that according to claim 1 and 2 for the direct impression of a ground tooth stump used and after lifting from this with fireproof, so-called solder investment is poured, which thereby the exact shape of the prep preserved tooth stump and at the same time as an individual dual slide in the ceramic oven.

4. Sinterable dental impression material according to one of the claims 1 to 3 characterized in that they are in the natural color shades of human teeth stained and in the three color sizes of the vital tooth, shade, light ness and intensity appear optically as soon as they are in the Kiln has been sintered.

5. Sinterable dental impression material according to one of the claims 1 to 4 characterized in that you sinterable Share is composed so that the sintered body ceramic, glass-like or porcelain-like structures having.

6. Sinterable dental impression material according to one of the claims 1 to 5, characterized in that as a mixing and Setting medium silicon-oxide-carbon compounds, Epimine plastics, glass ionomer cements, zinc oxide Phosphoric acid cements, hydrocolloids or other suitable setting media are or will be mixed.

7. Sinterable dental impression material according to one of the claims 1 to 5 characterized in that they are plastic Condition contains a plastic combination in which by a catalyst, by heat, by exposure to light or mechanical vibrations of the binding mechanism is started.

8. Sinterable dental impression material according to one of the claims 1 to 7, characterized in that they are in a transpa annuity plastic film in the shape of a natural Tooth, filled, layered in the same color and after Impression of the tooth stump is sintered in the furnace, whereby the plastic matrix burns without residue.

9. Sinterable dental impression material according to one of the claims 1 to 7 characterized in that they are for improvement precisely fitting crowns, inlays and onlays made of glass, ceramic or porcelain in this as relining material filled and sintered in the kiln after taking an impression becomes.