Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/0003—Making bridge-work, inlays, implants or the like
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
  • A61K6/802—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics

Definitions

• the present invention relates to a product, a method and a
• Kit for manufacturing a ceramic cup for the realization of a fully ceramic dental reconstruction in particular a jacket, a bridge, an inlay, an onlay, an overlay or a ceramic veneer.
• the ceramic-metallic assembly obtained is not satisfactory because the metal can appear through the ceramic layer, thus giving a grayish appearance to the final tooth.
• the presence of the metal can also cause biocompatibility problems due to the latent corrosion of the metal by saliva. This can result in an allergy caused by metal oxides.
• An object of the present invention is to replace the metal cup with a ceramic cup.
• a known technique consists in injecting, under pressure, a molten ceramic material into a mold, the cavity of which has the shape of the desired cup.
• Another technique consists, firstly, of applying an alumina slip on a plaster core and baking it to make a frame, then in a second step, infiltrating the frame with a glass powder by subjecting it to an infiltration cooking.
• the subject of the present invention is a technique making it possible to produce the cup without using an impregnation technique or injection means, and without requiring touch-up machining.
• the invention aims to produce the cup with a reduced number of firings, for example a single firing, or two firing if the mass of ceramic is large, as in the case of a bridge for example.
• the invention aims to give the prosthetist the means of producing a ceramic cup with his usual tools and his usual skills as easily as if he carried out any of the layers that the prosthetist must apply to a metal cup for perform a dental reconstruction.
• the prosthetist is provided with a product comprising: a) a basic composition essentially consisting of a ceramic powder and reinforcing fillers, said reinforcing fillers being constituted by fibers or platelets predominantly composed of '' one or more of the materials of the group consisting of alumina, zirconia, silica, glass, SIC, Si 3 N 4 , calcium phosphate and carbon, these fillers being in sufficient proportion to prevent deformation and cracking the cup during cooking of the cup; b) suitable solvents and / or vehicles for the product to be in the form of a paste or to be capable of being sprayed. possibly in aerosol form.
• the technician applies this product to the refractory core with a brush or by spray depending on the state of the product, and cooks the core thus covered at a temperature in the range 800 ° C - 1300 ° C or better in the range 910 - 1150 ° C, or even better in the range
• the cooking time can be remarkably short. for example of the order of thirty minutes, instead of several hours with conventional techniques.
• a separating product essentially consisting of: - a refractory powder, the grains of which are not liable to agglomerate with one another during the cooking of the cup and are chosen from the following constituents: Zr0 2 , A1 2 0 3 , Ti0 2 . TiC, Si 3 N 4 , BN, AIN, Si 2 ON 2 , TiN, TaN, CrN, AI 4 C 3 , SiC, B 4 C ZrC, Be 2 C, BeO, CaO, Cr 2 0 3 , MgO. Si0 2) WC, HC, HAP, TCP;
• the prosthetist is provided with a kit which comprises at least one or more basic compositions as defined above, these compositions comprising different coloring agents, and at least one liquid solvent for preparing one or more pastes with these compositions, this kit also preferably comprising at least one separator product as defined above.
• FIG. 2 is a schematic view of the refractory core after application of the separator
• - Figure 3 is a schematic view of the refractory core after completion of the ceramic base
• - Figure 4 is a schematic view of the refractory core during the extraction of the cup
• FIG. 5 is a schematic view of the cup in place on the master model before making the dentin
• FIG. 6 is a schematic view of the cup replaced on the refractory core for cooking the dentin
• - Figure 7 is a schematic view of the cup covered with dentin and mounted on a metal rod for cooking dentin.
• a core 1 is made of a refractory having the shape of the stump cut by the dentist from an imprint of this stump, for example a silicone imprint. (fig. 1).
• a paste essentially composed of one or more refractory powders chosen from the group consisting of the following materials is applied to this core (FIG. 2): Zr0, A1 2 0 3 . Ti0 2 , TiC. If 3 N 4 . BN. AIN. If 2 ON 2 . TiN. TaN. CrN. A1 4 C 3 . SiC. B 4 C. ZrC, Be 2 C. BeO, CaO. Cr 2 0 3 . MgO. Si0 2 . WC. HfC. PAH. TCP, an adhesive agent and a solvent. The grains of the powder are coated with the adhesive agent, which temporarily fixes the grains to the core and will be volatilized during the cooking of the cup. This adhesive agent also prevents absorption of liquid from the base composition by the separator.
• this product is in the form of an aerosol.
• the adhesive agent is, for example, an acrylic or / and polymer type adhesive, a cellulose adhesive, gum arabic or a fatty alcohol.
• the solvent is for example an ether, an alcohol, a polyalcohol, a glycol, a halogen derivative, an ester or water.
• This composition essentially consists of a ceramic powder and reinforcing fillers.
• the ceramic powder essentially consists of particles of one or more frits containing mainly silica and alumina, in minor part one or more oxides from the group consisting of CaO, K 2 0, MgO, Na 2 0 and B 2 0. possibly other oxides, possibly adjuvants.
• the reinforcing fillers which are mixed with the powder preferably consist of 5 to 60% by weight (relative to the total weight of powder + fillers) of fillers mainly composed of alumina, Zr0 2 or Si0. Charges can also be SiC, Si 3 N 4 , calcium phosphate, carbon or glass. These fillers are preferably fibers, long or short, or wafers or mixtures.
• the basic composition is applied in the paste state or by spraying, using an appropriate solvent, in a manner known per se, which can be identical to that of the separator.
• the separator + ceramic base assembly is heated on the core to a temperature higher than the firing temperature of the dentin and preferably in the range 800-1300 ° C., better in the range 910 to 1150 ° C. or even better in the range 910-1050 ° C.
• This baking temperature is strongly influenced by the presence of reinforcing fillers which increase the refractoriness of the material of the cup.
• a high fiber content can give the cup roughness and microporosity of the surface which allow a much better anchoring of the dentin.
• the cup 4 obtained after baking is easily detachable from the refractory core because the separator film has become essentially pulverulent (fig. 4).
• the cup is detached from the core and it is put in place (FIG. 6) on the master model 5 where the layer or layers intended to constitute the dentin 6 are applied to it in a manner known per se.
• the cup is then removed from the master model and is either replaced on the refractory core (fig. 6), or on another support, for example a metal tip 7 (fig. 7), to be heated again in order to cook. dentin.
• the dentin layers can then receive additional layers, for example intended to give transparency or a color, in a manner known per se, which will be baked.
• frit particles are mixed in an amount of 20 to 95% (by weight), for example 88%, of frit A and 0 to 20%. for example 3.4%, frit B; c) a calcium phosphate, for example hydroxyapatite (HAP), tricalcium phosphate (TCP) or tetracalcium phosphate, is added to this mixture.
• HAP hydroxyapatite
• TCP tricalcium phosphate
• tetracalcium phosphate tetracalcium phosphate
• the alumina fibers may have previously undergone a coating treatment with a slip having the composition of the said mixture, a heat treatment at a temperature in the range 800 - 100 ° C and a grinding; h) a paste is prepared by adding a solvent consisting of 10% (by weight) of natural flavor, 10% (by weight) of butane diol 1 -3 and 80% (by weight) of propylene glycol methyl ether, until you get the desired consistency.
• alumina fibers and a dye powder are added to the ground material, in an amount of 18% by weight of fibers and 1% by weight of dye per 81% by weight of the ground material.
• a paste is prepared as in Example I.

Landscapes

• Health & Medical Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• General Health & Medical Sciences (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Dentistry (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Plastic & Reconstructive Surgery (AREA)
• Dental Preparations (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 1993
  • 1993-03-16 FR FR9303029A patent/FR2702649B1/fr not_active Expired - Lifetime
• 1994
  • 1994-03-15 EP EP94909964A patent/EP0689414A1/de not_active Withdrawn
  • 1994-03-15 WO PCT/FR1994/000277 patent/WO1994021214A1/fr not_active Application Discontinuation
  • 1994-03-15 AU AU62608/94A patent/AU6260894A/en not_active Abandoned
  • 1994-03-15 CA CA002158445A patent/CA2158445A1/fr not_active Abandoned
  • 1994-03-15 JP JP6520708A patent/JPH08508025A/ja active Pending

Non-Patent Citations (1)

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