WO1997009942A2 - Procede de fabrication d'armatures metalliques pour protheses dentaires - Google Patents
Procede de fabrication d'armatures metalliques pour protheses dentaires Download PDFInfo
- Publication number
- WO1997009942A2 WO1997009942A2 PCT/FR1996/001403 FR9601403W WO9709942A2 WO 1997009942 A2 WO1997009942 A2 WO 1997009942A2 FR 9601403 W FR9601403 W FR 9601403W WO 9709942 A2 WO9709942 A2 WO 9709942A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- metal
- screed
- metallic
- stump
- metal sheet
- Prior art date
Links
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
Definitions
- the invention relates to a method of manufacturing metallic frameworks for dental prostheses:
- the currently most widely used technique in the field of making metal screeds for dental prostheses is the so-called lost wax technique which consists, successively, of producing, on the master model, the wax mock-up of the screed (or reinforcement); to put said cylinder model (in refractory lining); placing everything in a heat oven to melt the wax; to carry out a casting (in an electronic sling) of molten metal (nickel-chromium alloy in general) which will occupy all the volume left free by the wax; to adjust (scraping and sanding) the screed obtained.
- the technique in question has the following drawbacks:
- the time required to produce a screed is around 3 hours (cylinder hardening time, temperature rise and cooling ...);
- the material used occurs in large quantities (especially sensitive with the use of precious metals) because the thickness of the screeds is at least 0.6 mm with in addition losses related to the need to provide casting rods and various reservations;
- the method according to the invention makes it possible to produce a metal screed in less than 15 minutes against 3 hours with the basic technique known as lost wax and to meet the various technical and economic imperatives inherent in dentistry.
- a metal sheet whose melting point is higher than that of the metal particles of the metal powder intended to melt during the operation of transformation of the screed under the effect of the appropriate heat source and which has the property of not forming, at the transformation temperature of said screed, an eutectic mixture with one or more of the metallic constituents of said metal powder; to use, to cover said metal sheet formed on said stump model, a metal powder of which a part of the metal particles have the property of melting at the transformation temperature of the screed itself so as to firstly be welded between them the other part of the metallic particles which have not melted at said temperature and on the other hand to weld the overlying screed during formation to the underlying screed formed by the metal sheet formed on said stump model;
- the adhesive substance which covers the stump model makes it possible to avoid bad contacts between the metal sheet to be formed and said model above all with the use of sheets of thickness less than 0.010 millimeter where the micro-hammering is not necessary (time saving, better bet in form, economy of the micro-hammering device).
- the manual prefor ⁇ mage of the latter is essential.
- the eutectic mixture which could form between the metal sheet and the metal powder would have the effect of melting said sheet essentially with sheets of thickness less than 0.010 mm.
- the use of a refractory mixture inside the screed detached from the master model has the effect of stiffening said screed on the one hand for handling it without deforming it and on the other hand for serving as a fusion support. .
- the refractory mixture is prepared in less than a minute and is placed inside the screed with a simple brush.
- the metallic foil used essentially serves:
- a metallic powder compatible according to the phenomenon of atomic attraction, with at least one of the constituents of l metallic alloy, can be mixed with the refractory product (better resistance of metallic particles during the formation of the screed).
- the metal foil, shaped on the stump model can be covered with a film of burn-out adhesive substance capable of fixing, before mounting the overlying screed itself, a film of metallic powder of the type used. to make said screed. This operation makes it possible to create a rough surface which favors the mounting of the pasty metallic powder (better retention) on the metallic sheet.
- the pasty mixture in question comprises the metal powder and a liquid binder (adhesive suspended in a solvent).
- the liquid binder used is advantageously produced from a mixture of powdered polyvinylpyrrolidone, water, methanol and / or acetone in proportions suitable for obtaining, when it is mixed with aluminum powder.
- ⁇ metallic bindings, of a pasty product whose consistency allows it to be mounted on the metal sheet formed.
- the preferred proportions (by volume) are as follows:
- Water acts as an evaporation retarder and acetone (and / or methanol) as an evaporation accelerator.
- the mixture has been defined to take account of a consistency adapted to the ease of assembly throughout the working time and of evaporation at the end of assembly (drying under the effect of an appropriate heat source).
- the overlying screed can be produced from two powdered metal alloys with different melting points.
- the two alloys can be:
- the base metal layer which has the highest melting point, can also be placed between layers of the lowest melting filler metal. During the fusion there is interpenetration, by capillarity and by atomic attraction, of the two external layers in fusion in the mass of base metal.
- the alloy with the lowest melting point is nickel-chromium and that with the highest melting point of chromium-cobalt ; the first having for example a melting point of the order of 1100 ° C. and the second of 1200 ° C.
- the metal sheet used can in this case be platinum.
- the composition of these various alloys, which are of the type used in dental prosthesis, is for example:
- nickel-chromium 70 to 75% of nickel for 25 to 30% of chromium
- chromium-cobalt 25 to 30% of chromium for 70 to 75% of cobalt.
- the proportion of these various alloys in the final composition is for example from 15 to 30% of nickel-chromium (which constitutes the filler metal) for 70 to 85% of chromium-cobalt (which constitutes the base metal).
- the metal obtained after fusion has a nickel level of less than 15%, therefore below the toxicity threshold.
- the metal powder mixed with the refractory powder (which may be pure alumina) is for example nickel.
- the alloys used can be based on palladium and gold in variable proportions in order to obtain alloys with different melting points, for example 1100 ° C for the alloy the least dosed in palladium and 1300 ° C for the one most dosed in palladium and with a particle size of, for example, between 0.02 and 0.06 mm . Alloys of different particle sizes can also be used to make the same screed. In this case, the alloy with the smallest particle size corresponds to the lowest melting point and constitutes the filler metal whose molten particles will weld the particles of the other alloy. The welds can be made from an alloy of the same nature more dosed in gold.
- the particle size of the metal powders can advantageously be between 0.01 and 0.1 mm.
- - palladium is involved in rigidity and to increase the melting point;
- chromium intervenes for rigidity
- boron can intervene to lower the melting point
- copper for hardness
- silicon as deoxidizer
- the bond (affinity) between the various particles of the metals used involves the following phenomena:
- the alumina used as refractory powder also has a deoxidizing power. It is also possible to cover the screed obtained, in the case of the use of non-precious metal alloys, with a layer of metal or precious (or semi-precious) alloy.
- the melting cycle can be carried out under a deoxidizing atmosphere.
- the metal sheet used can advantageously have a thickness of less than 0.01 mm.
- a 0.005 mm sheet is formed on the stump in less than a minute with a simple brush and the adhesive substance is essential in this case.
- the metallic screeds obtained can be associated with metallic intermediate elements: a) by electrical spot welding directly in position on the master model; b) by adding a pasty mixture of metallic powders, of the above type but of lower melting point, so as to give said intermediate elements the desired final shape and to ensure, by fusion, the interstitial bonds; c) by the action of an appropriate heat source on the assembly thus obtained, separated from the master model, until the pasty mixture of metallic powders used melts.
- the binder used with the refractory product can be of the same type as that used with metallic powders.
Landscapes
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Powder Metallurgy (AREA)
- Dental Prosthetics (AREA)
- Dental Preparations (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR95/11008 | 1995-09-14 | ||
FR9511008A FR2738738A1 (fr) | 1995-09-14 | 1995-09-14 | Procede de fabrication d'armatures metalliques pour protheses dentaires |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/042,304 Continuation-In-Part US6027012A (en) | 1995-09-14 | 1998-03-13 | Method for making metal frameworks for dental protheses |
Publications (3)
Publication Number | Publication Date |
---|---|
WO1997009942A2 true WO1997009942A2 (fr) | 1997-03-20 |
WO1997009942A3 WO1997009942A3 (fr) | 1997-05-22 |
WO1997009942B1 WO1997009942B1 (fr) | 1997-07-10 |
Family
ID=9482730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1996/001403 WO1997009942A2 (fr) | 1995-09-14 | 1996-09-12 | Procede de fabrication d'armatures metalliques pour protheses dentaires |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR2738738A1 (fr) |
WO (1) | WO1997009942A2 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0104320A1 (fr) * | 1982-09-02 | 1984-04-04 | Itzhak Dr. Shoher | Couronne dentaire enveloppante à chaperon et procédé de fabrication |
FR2660224A1 (fr) * | 1990-03-30 | 1991-10-04 | Segura Claude | Procede de fabrication d'armatures metalliques et armatures obtenues par sa mise en óoeuvre. |
EP0464951A1 (fr) * | 1990-07-03 | 1992-01-08 | Elephant Edelmetaal B.V. | Méthode de restauration dentaire et structure secondaire pour celle-ci |
-
1995
- 1995-09-14 FR FR9511008A patent/FR2738738A1/fr not_active Withdrawn
-
1996
- 1996-09-12 WO PCT/FR1996/001403 patent/WO1997009942A2/fr active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0104320A1 (fr) * | 1982-09-02 | 1984-04-04 | Itzhak Dr. Shoher | Couronne dentaire enveloppante à chaperon et procédé de fabrication |
FR2660224A1 (fr) * | 1990-03-30 | 1991-10-04 | Segura Claude | Procede de fabrication d'armatures metalliques et armatures obtenues par sa mise en óoeuvre. |
EP0464951A1 (fr) * | 1990-07-03 | 1992-01-08 | Elephant Edelmetaal B.V. | Méthode de restauration dentaire et structure secondaire pour celle-ci |
Also Published As
Publication number | Publication date |
---|---|
WO1997009942A3 (fr) | 1997-05-22 |
FR2738738A1 (fr) | 1997-03-21 |
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