DE8710561U1 - Denture body - Google Patents

Description

Sheet. At. Application for registration of a utility model dated 30*07.87

According to the current state of technology, the following methods are known to produce dentures:

A* Ring-lid-crown,

B» Cast crown and cast inlay,

C. JarWelkrone made of ceramic,

D. Ceramic veneers - crowns or bridges,

E. Glass ceramic crowns or bridges,

F. Ceraplatin ceramic and

G. Crowns and bridges

of metal layers.

■In A., B., D., E. and G. it is first necessary to model the crown or bridge or similar in wax, then embed it in a fireproof investment material. Then melt the wax and pour precious metal or non-ferrous metal or glass ceramic into the preheated mold. After devesting, the cast object previously had to be mechanically processed and fitted onto the master model, which required a lot of time and, above all, large amounts of metal. A single crown made in this way often weighs 1 to 3 grams or even more.

Only now could the modeling of ceramic mass or plastic begin. With these procedures, it was always necessary for the dentist to grind off a lot of tooth substance from the tooth that was to be crowned in order to create enough space for the metal framework and the ceramic or plastic veneer. This was particularly detrimental to the continued health of the tooth.

In the case of C. (jacket crown), a cap made of platinum foil was folded onto the stump and adapted. Ceramic material was then modelled and fired. The platinum cap served as a support and was removed after firing, which meant that even on the prepared tooth step there was always a gap the size of the platinum foil and therefore no precise edge seal was achieved. Another disadvantage of the jacket crown was that it was nowhere near as strong as, for example, ceramic bonding.

In the case of E. (glass ceramic), the crown was first modelled in wax on the master model and then embedded in fireproof investment material like a casting cone. After the wax was expelled from the mould and the mould was preheated accordingly, glass was poured into the mould in a special melting system from crucibles that could only be used once. The de-embedded glass ceramic crown then had to be fired (ceramicised) again in a special kiln. The appropriate tooth colour was then painted on and fired again. This process did indeed achieve a good crown edge seal, but since it can only be used with special casting equipment, kilns and crucibles, this process is also considered to be disadvantageous.

Bl.at.t, 5.i Application for registration of a utility model dated 30-07.87

With F. (Ceraplatin ceramic), similar to the jacket crown, a folded foil cap made of precious metals was adapted to the model stump. The folds of the cap were then fused together using diffusion fusion. After that, an adhesive gold bonder had to be applied to this cap. Only then could the ceramic mass be modeled and then fired. The metal framework is much thinner than with a cast one, but these folded foils are very expensive. Another disadvantage of this technique is that the crown edge closure cannot be considered optimal due to the overlapping foil folds.

For G. (crowns and bridges through galvanic deposition of metal layers) it is necessary to use expensive galvanic equipment and galvanic baths, which is also a major disadvantage. Another disadvantage of this technology is that the work can only fit on 100% exact impressions. In addition, the galvanic procedure takes a lot of time, which is another disadvantage.

The ADVANTAGES of the above invention are as follows:

The processor can produce ceramic frameworks in a previously unknown layer thickness of just 1 µm or more, which means that the precious metal weight of a single crown is only about 0.1 grams. In addition, no additional equipment is required. Furthermore, the usual modeling and casting process can be saved.

Crowns or bridges can also be made, as well as ceramic inlays that have a perfect marginal seal without a gap at the cervical margin.

A further advantage of the aforementioned invention is that the total weight of the dentures to be worn by the patient is very low.

Another advantage is the light color of platinum when designing the color of the teeth to be replaced, as well as its oral compatibility.

A significant advantage of the invention is that the dentist has to grind off less healthy tooth substance from the teeth to be crowned, since the metal framework is manufactured in |im thickness.

Another very significant advantage is that the costs for dentures are significantly reduced due to the simple manufacturing method and the low weight of the precious metal.

. f CC

smooth Ci, application for registration of a utility model dated 30.07*87

An exemplary embodiment of the invention is explained in more detail below with reference to the drawings.

In this shows

DRAWING, No. I

&PSgr; the view of the AüTBRENN-METALL-LACK-SUSPENSION (l), broken down into the individual components it may contain:

Platinum powder (2), silver powder (3), palladium powder (4), gold powder (5), iridium powder (6), glasses (7), oxides (8), nitrides (9), carbides (10), non-ferrous metal powder (11), solvents (12), organic solvents (13), inorganic solvents (14) and binders (15).

DRAWING No. II

shows a section through a tooth stump (28) with a ceramic crown placed ^on top, a cast metal framework (29) and a fired ceramic mass (20) - each also in section, manufactured according to a known method.

DRAWING No. III

• shows a section through a tooth stump (28) with a

&iacgr; Ceramic crown of the same dimensions as in drawing no. II,

µm metal framework consisting of FIRED METAL LACQUER SUSPENSION (1) fired

« and fired ceramic mass (20) in section.

« This cross-section shows, compared to drawing no. II,

that less tooth substance had to be ground off the tooth stump (28),

j to make room for the metal framework and the ceramic veneer.

Furthermore, it is shown that the fired metal device, consisting of the FIRED METAL LACQUER SUSPENSION (1), is significantly thinner and therefore also considerably lighter in weight than the cast metal framework (29) shown in drawing no. II.

DRAWING No. IV

shows the cross-section through a tooth model made of refractory investment material (30).

The drawing shows a brush (16) with which the FIRED METAL LACQUER SUSPENSION (1) is applied to the tooth stumps (28).

Furthermore, it is shown that ceramic mass (20) is modeled and/or fired onto the BREN ¹ N-METAL LACQUER SUSPENSIONs (1).

It is also shown that plastic (25) is applied to the framework made from the BURNING-ON METAL LACQUER SUSPENSION (1).

Attached are 3 sheets of DRAWINGS.

Claims (13)

'( .^ Dental prosthesis body^ made of a metal framework adapted to a dental impression and a veneering material made of plastic or ceramic applied thereto, characterized in that the metal framework (1) is a sintered body obtained from a suspension preferably of precious metal powder, such as platinum powder, silver powder, palladium powder, gold powder and/or iridium powder, glasses, oxides, nitrides, carbides, non-ferrous metal powder, solvents and binding agents. 2. Dental prosthesis body according to claim 1, characterized in that the configuration of the inner contact surface of the meta-framework (1) is adapted to the outer surface of the tooth (28) by applying the suspension to a dental model of the tooth (28). 3. Dental prosthesis body according to claim 1 or 2, characterized in that the sintered ^body is free from residues of the solvent. 4. Dental prosthesis body according to claim 1 to 3, characterized in that the sintered body is designed as a solid metallic sinter, 5. Dental prosthesis according to claims 1 to 4, characterized in that the sintered body has a laminate structure which comprises at least 1 μm thick layers of glasses and H/19 Telephone: 0 &thgr;&bgr;-63 9&bgr; &Uacgr;&bgr;&Igr;&bgr;&KHgr;&iacgr; S-24 &Bgr;4&udiagr; HfKt cabl§: ^! Gornöanlapatenl MÜnbhen< Diesdrwr Bank (Monchen) Account 393« 044 (BU 700 SOo 00) Daulicho Bank (Munich) Account 2W1040 (BU 700 70010) Postscheckamt (Monchen) Account 070-43-604 (Bank Code 70010080) oxides. 6. Dental prosthesis according to claims 1 to 5, characterized in that on the outer surface of the metal framework (1) Ceramic mass (20) can be fired. 7. Dental prosthesis according to claim 1 to 6, characterized in that the metal framework (1) is galvanically reinforced. is cash. 10 8. Dental prosthesis according to claims 1 to 7, characterized in that the metal framework (1) is solderable. 9. Dental prosthesis according to claims 1 to 8, characterized in that the suspension forming the sintered body is composed in such a way that a temperature of up to 1500 ^° C can be used for sintering. 10. Dental prosthesis according to claims 1 to 9, characterized in that the metal framework (1) has at least one further sintered body made of suspension applied to the outer surface of the metal framework (1) and sintered ai.f wei st. 11. Dental prosthesis according to claims 1 to 10, characterized in that the metal framework (1) has a metal layer cast onto its outer surface. 12. Dental prosthesis according to claims 1 to 11, characterized in that on the outer surface of the metal framework (1) Glass ceramic is applied. 13. Preform for a dental prosthesis according to one of the preceding claims 1 to 12, in the form of a metal framework, obtained from a sintered mass of a sus- it &igr; ft i! pension preferably from precious metal powder/ such as platinum powder, silver powder, palladium powder> gold powder and/or iridium powder*/ glasses/ oxides, nitrides/ carbides/ non ^-ferrous metal powder/ solvents and binding agents by drying the binding agent.