EP1868525A1 - Verfahren zur herstellung von dentalformteilen - Google Patents
Verfahren zur herstellung von dentalformteilenInfo
- Publication number
- EP1868525A1 EP1868525A1 EP06742575A EP06742575A EP1868525A1 EP 1868525 A1 EP1868525 A1 EP 1868525A1 EP 06742575 A EP06742575 A EP 06742575A EP 06742575 A EP06742575 A EP 06742575A EP 1868525 A1 EP1868525 A1 EP 1868525A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thermoplastic
- molding
- molding compound
- dental
- mold cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 238000000465 moulding Methods 0.000 claims abstract description 146
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 124
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 124
- 150000001875 compounds Chemical class 0.000 claims abstract description 70
- 238000012545 processing Methods 0.000 claims abstract description 35
- 238000007493 shaping process Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 78
- 230000006835 compression Effects 0.000 claims description 20
- 238000007906 compression Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 20
- 229920006260 polyaryletherketone Polymers 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- 125000003118 aryl group Chemical group 0.000 claims description 13
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 10
- 229920002530 polyetherether ketone Polymers 0.000 claims description 10
- 239000000945 filler Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 239000012778 molding material Substances 0.000 claims description 8
- 239000012783 reinforcing fiber Substances 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 229920001652 poly(etherketoneketone) Polymers 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 claims description 3
- 229920000106 Liquid crystal polymer Polymers 0.000 claims description 2
- 229920008285 Poly(ether ketone) PEK Polymers 0.000 claims description 2
- 239000004962 Polyamide-imide Substances 0.000 claims description 2
- 239000004642 Polyimide Substances 0.000 claims description 2
- 150000002576 ketones Chemical class 0.000 claims description 2
- 229920002492 poly(sulfone) Polymers 0.000 claims description 2
- 229920002312 polyamide-imide Polymers 0.000 claims description 2
- 229920001230 polyarylate Polymers 0.000 claims description 2
- 229920000412 polyarylene Polymers 0.000 claims description 2
- 229920001601 polyetherimide Polymers 0.000 claims description 2
- 229920001721 polyimide Polymers 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 238000001721 transfer moulding Methods 0.000 claims description 2
- 239000004697 Polyetherimide Substances 0.000 claims 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims 1
- 238000000748 compression moulding Methods 0.000 claims 1
- 230000008676 import Effects 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 13
- 238000003825 pressing Methods 0.000 description 11
- 230000008901 benefit Effects 0.000 description 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 6
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 239000007943 implant Substances 0.000 description 4
- 125000000468 ketone group Chemical group 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000000877 morphologic effect Effects 0.000 description 3
- 210000003254 palate Anatomy 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000012767 functional filler Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000000110 selective laser sintering Methods 0.000 description 2
- 239000012815 thermoplastic material Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 208000015943 Coeliac disease Diseases 0.000 description 1
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000001055 chewing effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000013499 data model Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- -1 ether ketone ketone Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000018984 mastication Effects 0.000 description 1
- 238000010077 mastication Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002121 nanofiber Substances 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920001643 poly(ether ketone) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920003252 rigid-rod polymer Polymers 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 210000000332 tooth crown Anatomy 0.000 description 1
- 238000012549 training Methods 0.000 description 1
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
- A61C13/20—Methods or devices for soldering, casting, moulding or melting
-
- 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
- A61C13/20—Methods or devices for soldering, casting, moulding or melting
- A61C13/206—Injection moulding
Definitions
- the invention relates to a method for the production of dental moldings according to the preamble of claim 1.
- the object of the invention is to provide a dental prosthesis, which can be produced in a simple process and which has a high strength and dimensional stability even with low scaffold design by its isotropic properties.
- the molding composition at least in the region of the mold cavity at the time of introduction of the thermoplastic in the mold cavity at a temperature of at least 150 0 C, preferably at least 200 0 C, in particular more than 250 0 C.
- This strong heating of the molding composition causes an improvement in the mechanical properties and a reduction of residual stresses and shrinkage and distortion and thereby leads to a better dimensional stability and dimensional stability with improved mechanical properties of the dental molding.
- the mechanical properties are stabilized in all directions, resulting in an isotropic behavior in the dental molding, which has the same mechanical properties in all directions. This is very much in the oral field due to the occurrence of cyclic forces during mastication important, because of the inherent mobility of the teeth also very strong torsional loads occur in the dental moldings.
- thermoplastic heated to processing temperature into the mold cavity of cold or moderately warm molding compositions
- freezing of the molecules of the thermoplastic oriented by the pressing operation associated with the flow direction occurs
- the areas still at processing temperature are pressed further into the mold cavity by the pressure, which is why different temperature ranges and also different morphological structures or layers form within the cross section of the dental mold part.
- the mechanical properties are thereby greatly reduced, resulting in a dental molding with anisotropic properties and a low torsional strength.
- this results in very strong residual stresses which, on the one hand, considerably reduce the mechanical properties and, on the other hand, lead to a distortion of the dental molding and thus have a negative effect on dimensional stability and dimensional stability.
- thermoplastics Especially with semicrystalline thermoplastics, the crystallization of the thermoplastic is very much hindered by this rapid solidification, which is why only a reduced degree of crystallization is achieved. Of the Reduced degree of crystallization in turn reduces the density and thus also the mechanical properties of the dental molding. Furthermore, this leads to strong semicrystalline thermoplastics
- thermoplastics in addition to the above-mentioned disadvantages, an orientation of the reinforcing fibers is avoided, so that the dental molding has isotropic mechanical properties and dimensional stability in all directions when manufactured according to the invention.
- thermoplastic dental moldings Ltd., thermoplastic dental moldings gleichannoige formation of the morphological structure, whereby the dental molding has excellent mechanical properties, in particular a very high breaking strength, especially in the cyclic long-term load as required for dental moldings. Furthermore, the density of the dental molding and thereby the hardness of the same is increased by the inventive method. The toughness is also improved and shrinkage is avoided, whereby a high better dimensional accuracy of the dental molding is given.
- the orientations of the molecules on the outer surfaces are dependent not only on the temperature of the molding compound but also on the rate of introduction and the shear forces associated therewith. For this reason, the heated thermoplastic is preferably introduced slowly into the mold cavity.
- the molding compound connecting element which connects the mold cavity with the outside of the molding compound, or in the presence of a pre-dining space and these areas are heated to the optimum function to approximately the same temperature as the mold cavity.
- the inventive high temperature of the wall of the mold cavity prevents orientation of the molecules of the thermoplastic in the flow direction and thereby ensures a high torsional strength of the dental molding.
- the inventive dental molding stop also occurring during chewing in various directions Torsionskraften high status or by the Aufhangungsapparat of the natural tooth (see Scharpey v fibers) are related.
- the high torsional strength due to the isotropic properties of the dental molding is beneficial to any erf ubendungsge94en artificial dentures, thus not only fixed dentures such as crowns, bridges, implant abutments, etc., but also a removable dentures.
- the inventive method in particular all dental moldings that are currently produced in the model casting technique of metal, can be formed, for example, palate plates or palate, especially brackets for attachment to residual teeth.
- the inventive method is particularly suitable for the production of removable dentures for upper and lower jaw. It can thus also Verstarkungsetti in particular for full dentures, such as base plates are produced.
- crowns, bridges and implant abutments and parts for the bedding technology with graceful configurations and high strengths can be produced.
- Another advantage is the use of the dental moldings produced by the process according to the invention for permanent, permanent fixed dentures such as crowns, bridges, implant abutments. So far, thermoplastics were in these Applications due to the mentioned poor strength values, which lead to breakage of the dental moldings at cyclic load, given only temporary employment opportunities.
- the molding compound in the region of the mold cavity when the heated to processing temperature thermoplastic is introduced into the mold cavity in the molding composition, a temperature which is at most 100 0 C below the processing temperature of the thermoplastic.
- the molding composition in the region of the mold cavity at the time of introduction of the thermoplastic to a temperature which is not more than 50 0 C, preferably not more than 15 0 C below the processing temperature of the thermoplastic.
- the processing temperature of the thermoplastic is the temperature at which the thermoplastic is introduced into the mold cavity in the molding compound under pressure.
- thermoplastics For amorphous thermoplastics is the
- the molding compound is preferably heated to a temperature which is equal to or higher than the melting point of the unfilled thermoplastic.
- the processing temperature is normally above 300 ° C., in particular above 330 ° C.
- the processing temperature increases when the thermoplastic is reinforced by reinforcing fibers or the like.
- the processing temperature of non-starred polyaryletherketones depending on the ether to keto group ratio at about 330 degrees Celsius to 400 degrees Celsius and in reinforced or otherwise filled polyaryletherketones at about 360 degrees Celsius to 450 degrees Celsius.
- the dental molding according to the invention can in particular form an inlay, an onlay, a crown, a bridge, a root post, a post construction, attachments with a patrix and / or die or an implant structure.
- the inventive dental molding can also form only such Gerustmaschine that are veneered with other plastics. Artificial teeth can also be applied to the dental molding according to the invention.
- the dental molding parts of removable dentures, especially load-bearing parts or mounting brackets form.
- the dental molded part produced according to the invention is normally veneered for aesthetic reasons, for example with light-polymerisable plastics known from the prior art, which can be correspondingly colored.
- dental moldings such as a crown can be made very thin without losing the high strength. Because of the highly heated molding compound, the thermoplastic can in fact be pressed into very thin cavities without any morphological inhomogeneities in the dental molding or internal stresses occur which reduce its mechanical properties or cause distortion.
- thermoplastics containing Verstarkungsfasern and the like fillers are also preferred.
- a dental prosthesis with minimal invasive text can be realized.
- thermoplastic may e.g. with whiskers or functional fillers, e.g. Glass bubbles, be strengthened.
- the inventive method is therefore particularly suitable for the production of thin-walled moldings with Verstarkungsfasern.
- Verstarkungsfasern the leaking ends are made extremely thin.
- this also applies to the palate plates, mounting brackets for removable dentures or other dental moldings with thin-walled sections.
- the shaping model of the dental molding according to the invention is preferably produced by a generative manufacturing process (rapid prototyping). With such methods, the forming models can be fabricated without the elaborate production of dental prints and dental models based on computer-internal data models.
- the dentist scans the oral situation of the teeth and, based on this data, which can be modified on the computer to the material to be produced, using generative processing techniques such as stereolithography (STL or SLA), selective laser sintering (SLS), laser generation, Fused Deposition Modelmg (FDM), Laminated Object Modeling (LOM), 3D Printing, Contour Crafting (CC) and Multi Jet Modeling forming models produced from readily removable material.
- the thermoplastic used according to the invention for producing the dental molding is preferably an aromatic thermoplastic, in particular an aromatic thermoplastic having aryl groups in the main chain.
- aromatic thermoplastics with aryl groups in the main chain are high-temperature thermoplastics, such as polyarylates, polyarylene sulfides, polysulfones, liquid crystal polymers, especially liquid-crystalline polyesters, polyimides, polyetherimides, polyamide-imides or polyaryletherketones, as well as copolymers of at least two of the abovementioned Polymers or a blend of at least two of the above-mentioned aromatic thermoplastics.
- PAEK polyaryletherketones
- PEK polyether ketone
- PEEK polyetheretherketone
- PEKK polyetherketone ketone
- PEEKK polyetheretherketone ketone
- Polyether ketone ether ketone ketone (PEKEKK) or the like used linkages of ether and keto units, copolymers of at least two of these polyaryletherketones or a blend of at least two of these polyaryletherketones.
- polyaryl ether ketones which have an ether and keto group ratio of about 1: 1 (eg PEEKK) or in which more keto groups are present than ether groups (eg PEKK).
- PEEKK polyaryl ether ketones
- PEKK polyaryletherketones
- thermoplastics which are very difficult or impossible to process in conventional injection molding apparatuses, for example thermoplastics which are self-reinforced for extrusion processes and which are particularly rigid due to the aromatic chain structure (so-called rigid rod polymers).
- Polyaryletherketones are characterized by excellent alternating load resistance, creep resistance, dimensional stability and temperature resistance.
- the inventive method also gives them a good processability. Also, these thermoplastics do not tend to thermooxidation even at the high processing temperatures, so that no gases can occur, the
- thermoplastic containing fillers is preferably used.
- fillers in the context of this invention is meant any additive added to the thermoplastic.
- it means fillers such as color additives or reinforcing fibers or any functional fillers which influence the processability or the mechanical or thermal properties.
- the thermoplastic may contain fillers totaling more than 10% by weight, preferably more than 30% by weight.
- the proportion of Verstarkungsfasern at least 25 wt .-%, in particular at least 30 wt .-% amount.
- the proportion of Verstarkungsfasern also more than 70 wt .-%, in particular 90 wt .-% and more.
- thermoplastics possible by the process according to the invention, which are filled with reinforcing fibers having a diameter of 3 microns to 15 microns, and the volume of the fiber fraction is more than 30% by volume, preferably more than 40% by volume. more preferably more than 50 vol .-% amounts.
- Verstarkungsfasern are all known organic and inorganic fibers such as plastic fibers, glass fibers, carbon fibers, etc. possible.
- fibers having a fiber diameter between 3 microns and 25 microns are used. Especially preferred with a fiber diameter of 5 microns to 13 microns.
- Another preferred embodiment is the use of nanofibers in the thermoplastic.
- the filling of the mold cavity in the molding compound with the thermoplastic takes place according to the invention at a low speed, preferably within a period of more than 1 second, preferably more than 3 seconds, in particular more than 6 seconds.
- orientation of the molecules in the direction of flow or, if present, reinforcing fibers are prevented from orienting them with the abovementioned disadvantages.
- shear stresses within the thermoplastic melt which can lead to a molecular chain break and thereby to a lowering of the mechanical properties, are avoided.
- a negative effect on the fillers, in particular fiber damage is avoided.
- thermoplastics which in particular tend to undergo thermal oxidation and thereby reduce mechanical properties
- inert gas for example nitrogen or argon
- thermoplastic dental molding is preferably accelerated in the molding compound accelerated, for example, by placing it in a Kuhlvorraum, a blower or by coils with air or an inert gas.
- the cooling of the thermoplastic dental molding within the molding compound is preferably carried out at a rate of less than 20 ° C / min, especially less than 10 ° C / min, more preferably less than 5 ° C / min.
- thermoplastic for the process according to the invention.
- pre-drying the residual moisture is removed, which lead to bubbles, streaks or the like in the dental molding.
- the pre-drying is preferably carried out at a temperature of about 130 0 C, preferably several hours, for example, at PEEK at about 150 0 C for at least 3 hours.
- the pre-dried thermoplastic is preferably provided vacuum-packed for processing. This eliminates the need to pre-dry the thermoplastic before processing in the dental laboratory. Furthermore, it has proved to be advantageous to use a thermoplastic in the form of a prefabricated blank or pellets.
- the blank preferably has a volume which essentially corresponds to the dental molding to be produced. That is, the dental technician can thus use, for example, for a particular dental molding, such as a Kronenkappchen, a specific blank of appropriate size.
- polyaryl ether ketones and the other aromatic thermoplastics preferably used according to the invention with aryl groups in the main chain are in some cases quite expensive plastics, which prevents excessive material loss.
- the prefabricated blank preferably has a volume which corresponds to the volume of the mold cavity in addition to the possibly existing connection channels for connecting the mold cavity to the outside of the molding compound and zuzuglich a safety margin of, for example, a maximum of 25 vol .-%.
- the blank has the advantage that the thermoplastic is homogeneously plasticized, has no trapped air and when using fillers and reinforcing fibers they are already homogeneously dispersed in the thermoplastic matrix. In addition, it comes with a compressed blank or pressing with a smaller pre-compression space.
- the blank may have any shape, for example, cylindrical, prismatic, annular or hollow cylindrical.
- the blank may for example be formed by extrusion, injection molding, transfer molding or pressing.
- the prefabricated blank may for example be formed annular or disc-shaped, so have a greater width than height.
- a blank used which has a greater height than width.
- a molding compound is prepared, which is provided with a pre-compression space for receiving the thermoplastic. This allows easy introduction of the thermoplastic by pressurization in the mold cavity.
- the introduction of the thermoplastic in the mold cavity can be done in any manner, for example by extrusion, injection and the like.
- a pressing method is used.
- a press die or other stamp-shaped element can be used.
- the pre-press room represents the space into which the blank is placed and into which the punch is inserted.
- the blank can be heated before being introduced into the pre-compression space and then further heated in the pre-compression space by the hot molding compound.
- a former made of wax, plastic or the like fusible, combustible or otherwise removable material can be embedded in the molding compound and removed without residue after curing of the molding material.
- the former for the pre-compression space can also be connected to a muffle base and removed after curing of the molding compound.
- the former for the pre-compression space and the muffle base can form a unit of the same material.
- the blank can be introduced in cold or vorerwarmten state to the premoulding, but it is preferably proposed to at least 150 0 C, in particular to just below the processing temperature, and then heated by the molding compound to the processing temperature.
- the ram is also preferably preheated to at least 150 ° C prior to the introduction of the thermoplastic, and preferably to just below the processing temperature.
- the punch preferably has the same coefficient of thermal expansion as the molding compound.
- the stamp is also at least in the front region of the molding compound.
- the inner diameter of the sleeve which may consist for example of metal, ceramic or molding material, substantially corresponds to the outer diameter of the press ram.
- the sleeve may have a bottom. The bottom is then provided with a passage opening for introducing the thermoplastic into the mold cavity. If the molding compound has a pre-compression space, the outer diameter of the sleeve substantially corresponds to the diameter of the pre-compression space. In any case, such a sleeve can also be attached to the molding compound outside the molding compound.
- the molding compound and optionally the compression punches have previously been heated, for example, in an oven to the inventive temperature of at least 150 0 C, it may optionally be completely dispensed with during the pressing process to an additional heating of the molding material.
- a device of very simple construction for pressurizing the blank or / and for pressurizing during the cooling process of the dental molding (removal) can be used.
- only a guided weight or a spring can load the press ram in order to press the thermoplastic into the mold cavity of the molding compound and / or to maintain the holding pressure.
- the molding compound is heated above the processing temperature of the thermoplastic in an oven.
- thermoplastic a preheated but not yet flowable blank is placed in the pre-compression space and pressurized with a stamp. Due to the insulating properties of the molding compound, the stored heat is released to the thermopiates and this brought to the processing temperature, so that after reaching the flowability without further external heat input by aufwandige constructions a simple introduction of the thermoplastic is possible.
- the molding compound for example, the usual in dental plasters and the usual gypsum-bound or the phosphate-bonded investment materials can be used.
- any mass can be used which can be positioned and cured in a liquid state around the forming model and which have the necessary properties for removal of the shaping model (eg thermal stability during removal with temperature or chemical stability during chemical removal) during the process of incorporation of the thermoplastic in the mold cavity necessary thermal stability and compressive strength and the required dimensional stability, in particular with regard to the interaction of the expansion and contraction properties between thermoplastic and molding compound.
- molding compositions are preferred which, in order to achieve the strength necessary for the pressing process, do not have to be heated beyond the processing temperature of the thermoplastic, especially air-permeable molding compounds, so that the trapped air can escape in the mold cavity.
- Very particular preference is given to molding compositions which use a final temperature of about 400 degrees Celsius to 450 degrees Celsius have, since these then already have the final hardness and not have to be heated further up (for example, phosphate-bonded investments with heating temperatures of about 600 degrees Celsius to 700 degrees Celsius). This gives you time, since the cooling phase does not have to wait and there are no microcracks in the molding compound during the cooling process, which can lead to poor images or unexpected fractures of the molding compound during the pressing process. Gypsum-bound molding compounds are therefore preferred.
- thermoplastic material in the mold cavity of the molding material controlled mainly by the temperature of the investment.
- Both the molecules in the thermoplastic as well as any fibers present are thereby not damaged or oriented, whereby a finished dental molding of the highest strength is obtained.
- the molding composition is thermally regulated or homogenized prior to the introduction of the thermoplastic, so that approximately the same temperature is present in all areas. This has advantages when pressing several objects, for example, of several crowns or bridges.
- the inventive method is basically no reinforcement of the molding material necessary.
- a reinforcement may be used, for example in the form of a metal surround surrounding the molding compound.
- thermoplastic By the method according to the invention, high pressures can be avoided when introducing the thermoplastic into the mold cavity. For example, weights of approx. 2 kilograms to 5 kilograms, which are applied to the Prestempel, are sufficient for a homogeneous insertion. As a result, favorable devices can be realized.
- Figures 1 and 2 are each a blank made of a thermoplastic material
- FIG. 3 shows a section through a muffle
- Figure 4 is a view of the muffle base of the muffle of Figure 3;
- Figure 5 shows a section through the cured molding compound with pressing device
- Figures 6 and 7 are each a section through the cured molding compound according to other embodiments.
- the blank 1 formed from a thermoplastic has a cylindrical shape which has a greater height than its diameter.
- the blank 1 is formed disc-shaped contrast.
- a muffle 2 consists of a muffle base 3, a muffle wall or cuff 4 and a muffle cover 5.
- the muffle base 3 has in the middle a projection 6, which has a blank 1 corresponding diameter.
- a wax model 7 of the dental molding to be produced is arranged, e.g. two crown caps.
- the wax model 7 is connected to the projection 6 with rods 8 or the like made of wax.
- the muffle 2 is filled with a temperature-resistant, hardenable molding compound 9.
- the molding compound 9 is then cured in the muffle 2. Thereafter, the lid 5, the muffle wall 4 and the muffle base 3 are removed.
- the wax model 7 including the wax rod 8 is then melted.
- a mold cavity 11 is formed in the molding compound 9, which corresponds to the negative of the dental molding to be produced, also a pre-compression chamber 12, which corresponds to the projection 6, and feed channels 13 which connect the mold cavity 11 with the pre-compression chamber 12 ( Figure 5).
- the pre-press space 12 is filled with a blank 1 and the blank 1 is pressurized with a punch 14 to press the thermoplastic through the channels 13 into the mold cavity 11.
- the pressing die 14 consists of the same molding compound as the molding compound 9, at least in its front region.
- the rear portion of the punch 14 may for example also be made of ceramic.
- the punch 14 is loaded with a weight 17 which is arranged on a printer 18, which is guided by a guide 19 and rests with a stop surface 20 on the punch 14.
- thermoplastic blank 1 has been preheated to a processing temperature of for example 300 0 C with a heater, not shown.
- the molding compound 9 is heated with a heater, not shown, for example, to a temperature of 330 0 C. After pressing the thermoplastic 1 into the mold cavity 11, the molding compound 9 is cooled and after solidification of the thermoplastic in the mold cavity 11, the dental molding with the sprues formed by the channels 11 is removed from the mold.
- FIG. 6 differs from that of Figure 5 essentially in that instead of the pre-compression chamber 12 for receiving the blank, an insertion funnel 15 is provided which receives the thermoplastic melt formed from the blank 1 to them via the connecting channel 13 to the mold cavity eleventh supply. In the hopper 15 of the punch 14 is guided.
- the blank 1 is arranged in a sleeve 22, for example made of metal or ceramic.
- the sleeve 22 with the blank 1 can, for example, be preheated in a furnace independent of the molding compound 9.
- the sleeve 22 has an outer diameter which corresponds to the outer diameter of the pre-compression space 12 in the molding compound 9.
- the inner diameter of the sleeve 22 corresponds the outer diameter of the punch 14.
- the sleeve 22 has a bottom 23 with a passage opening 24 which is aligned with the supply channel 13.
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)
- Dental Prosthetics (AREA)
- Dental Preparations (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005016939A DE102005016939A1 (de) | 2005-04-12 | 2005-04-12 | Verfahren zur Herstellung von Dentalformteilen |
PCT/EP2006/003391 WO2006108647A1 (de) | 2005-04-12 | 2006-04-12 | Verfahren zur herstellung von dentalformteilen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1868525A1 true EP1868525A1 (de) | 2007-12-26 |
Family
ID=36658583
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06742575A Withdrawn EP1868525A1 (de) | 2005-04-12 | 2006-04-12 | Verfahren zur herstellung von dentalformteilen |
Country Status (15)
Country | Link |
---|---|
US (1) | US20090155736A1 (uk) |
EP (1) | EP1868525A1 (uk) |
JP (1) | JP2008535597A (uk) |
KR (1) | KR20080015068A (uk) |
CN (1) | CN101252893A (uk) |
AU (1) | AU2006233695A1 (uk) |
BR (1) | BRPI0607552A2 (uk) |
CA (1) | CA2604426A1 (uk) |
DE (1) | DE102005016939A1 (uk) |
HR (1) | HRP20070475A2 (uk) |
NO (1) | NO20075665L (uk) |
RU (1) | RU2007141653A (uk) |
SG (1) | SG163501A1 (uk) |
UA (1) | UA89669C2 (uk) |
WO (1) | WO2006108647A1 (uk) |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007013285A1 (de) | 2007-03-16 | 2008-09-18 | S&C Polymer Silicon- und Composite Spezialitäten GmbH | Konditionierungsmittel und Verfahren zum Binden von härtbaren Mischungen an Formkörper aus gefüllten hochtemperaturbeständigen Kunststoffen |
DE202007004265U1 (de) * | 2007-03-20 | 2007-05-24 | Wegold Edelmetalle Ag | Vorrichtung zum Pressen eines dentalen Materials zur Herstellung eines Zahnersatzes oder Zahnteilersatzes |
KR101005425B1 (ko) * | 2009-12-14 | 2010-12-31 | 박상규 | 커버타입 임플란트용 고정인서트 제조방법 |
US20120261848A1 (en) * | 2009-12-23 | 2012-10-18 | Haraszati Gyoergy | Method to create removable dental prosthesis, and the dental prosthesis making thereof |
KR101306267B1 (ko) * | 2011-05-19 | 2013-09-09 | 허만호 | 치과 보철물 주조 장치 및 그 제조방법 |
EP3470012B1 (de) * | 2011-07-25 | 2021-04-07 | Ivoclar Vivadent AG | Dentalofen |
DE102013100529A1 (de) * | 2013-01-18 | 2014-07-24 | Bredent Gmbh & Co. Kg | Verankerungselement und Verfahren zur Herstellung |
EP2772223B1 (de) * | 2013-02-27 | 2017-10-11 | Ivoclar Vivadent AG | Dentalpressofen |
CA2910946C (en) * | 2013-06-04 | 2020-03-31 | Donald FRANTZ | Dental appliance system and method of manufacture |
GB201322565D0 (en) * | 2013-12-19 | 2014-02-05 | Juvora Ltd | Polyaryletherketone dental block for cad/cam milling |
EP3064169B1 (de) * | 2015-03-04 | 2019-04-24 | Ivoclar Vivadent AG | Verfahren zur herstellung einer dentalkeramik sowie dentalkeramik-erzeugungsvorrichtung |
DE102016109007A1 (de) * | 2016-05-17 | 2017-11-23 | Yong-min Jo | Retainer sowie Verfahren zu dessen Herstellung |
DK179398B1 (en) | 2016-10-31 | 2018-05-28 | Vkr Holding As | Method of providing a covering element and a covering element for covering a hinge part of a roof window |
CN106738598A (zh) * | 2017-01-17 | 2017-05-31 | 运怡(北京)医疗器械有限公司 | 一种peek牙科盘的制备方法及peek牙科盘 |
KR200486441Y1 (ko) * | 2017-08-31 | 2018-05-21 | 김영수 | 잉곳 성형용 플런저 프레싱장치 |
JP6857634B2 (ja) * | 2018-06-29 | 2021-04-14 | 株式会社ジーシー | 歯科補綴物成型用器具、歯科補綴物の製造方法 |
EP3725262B1 (de) * | 2019-04-18 | 2022-11-02 | Ivoclar Vivadent AG | Dentales ausbettverfahren sowie muffel |
KR102247469B1 (ko) | 2020-06-29 | 2021-04-30 | 이노범 | 3d 프린팅 및 원심 주조를 이용한 치과용 의료물품의 제조방법 및 그 치과용 의료물품 |
CN113246279B (zh) * | 2021-05-27 | 2022-09-30 | 南京精益义齿有限公司 | 一种防气泡模牙生产加工机构 |
WO2024018016A1 (en) | 2022-07-21 | 2024-01-25 | Syngenta Crop Protection Ag | Crystalline forms of 1,2,4-oxadiazole fungicides |
WO2024033374A1 (en) | 2022-08-11 | 2024-02-15 | Syngenta Crop Protection Ag | Novel arylcarboxamide or arylthioamide compounds |
GB202214203D0 (en) | 2022-09-28 | 2022-11-09 | Syngenta Crop Protection Ag | Fungicidal compositions |
GB202214202D0 (en) | 2022-09-28 | 2022-11-09 | Syngenta Crop Protection Ag | Agricultural methods |
KR20240052239A (ko) | 2022-10-14 | 2024-04-23 | 오광문 | 임플란트 크라운 제조 방법 |
WO2024100069A1 (en) | 2022-11-08 | 2024-05-16 | Syngenta Crop Protection Ag | Microbiocidal pyridine derivatives |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1779542A1 (de) | 1968-08-24 | 1972-02-24 | Polyapress Gmbh & Co | Vorrichtung zum Spritzen von in Kartuschen befindlichem Kunststoff sowie Kartuschen dafuer |
US4585417A (en) * | 1979-12-14 | 1986-04-29 | Coors Porcelain Company | Dental appliance and method of manufacture |
FR2495052A1 (fr) * | 1980-11-28 | 1982-06-04 | Leis Gerard | Dispositif pour l'injection en discontinu d'une matiere plastique dans un moule, et procede pour l'application de ce dispositif a la realisation d'une prothese dentaire |
GB2159457B (en) * | 1984-05-25 | 1988-06-22 | Nigel James Knott | Apparatus for injection or transfer moulding |
JPS6113951A (ja) * | 1984-06-29 | 1986-01-22 | 株式会社 モルテン | 義歯の製造方法 |
US4894012A (en) * | 1987-11-16 | 1990-01-16 | The University Of Connecticut | Passive dental appliances of fiber-reinforced composites |
CA2089266C (en) * | 1990-08-27 | 2002-07-09 | Philip S. Blatz | Toughened thermoplastic polyester compositions |
JPH07227400A (ja) * | 1994-02-18 | 1995-08-29 | High Dentaru Japan Kk | 義歯床等の製造方法 |
DE19751999A1 (de) * | 1997-11-24 | 1999-05-27 | Helmut Purner | Vorrichtung zum Zahnersatz |
US6186790B1 (en) * | 1998-04-13 | 2001-02-13 | Jeneric/Pentron Incorporated | Prefabricated components for dental appliances |
US6533969B1 (en) * | 1998-06-12 | 2003-03-18 | Jeneric/Pentron, Inc. | Method of making high-strength dental restorations |
US20050023710A1 (en) * | 1998-07-10 | 2005-02-03 | Dmitri Brodkin | Solid free-form fabrication methods for the production of dental restorations |
JP2001137263A (ja) * | 1999-11-10 | 2001-05-22 | Gc Corp | 歯科用補綴物の作製方法 |
US6641398B2 (en) * | 2000-08-21 | 2003-11-04 | Ivoclar Vivadent Ag | Dental materials containing a tear-off material |
US6497574B1 (en) * | 2000-09-08 | 2002-12-24 | Align Technology, Inc. | Modified tooth positioning appliances and methods and systems for their manufacture |
US6572796B1 (en) * | 2000-10-27 | 2003-06-03 | General Electric Company | Method of predicting optimal injection molding cycle time |
DE10136584A1 (de) | 2001-07-28 | 2003-02-13 | Zubler Geraetebau | Verfahren zur Herstellung von Preßkeramik in der Zahntechnik; Keramikpreßofen, Muffel und Muffellehre hierfür |
JP2004205003A (ja) * | 2002-12-26 | 2004-07-22 | Ntn Corp | 樹脂製シールリングおよびその製造方法 |
ATE380518T1 (de) * | 2004-05-19 | 2007-12-15 | Straumann Holding Ag | Einstückiges dentalimplantat und verfahren zu dessen herstellung |
-
2005
- 2005-04-12 DE DE102005016939A patent/DE102005016939A1/de not_active Withdrawn
-
2006
- 2006-04-12 KR KR1020077023527A patent/KR20080015068A/ko not_active Application Discontinuation
- 2006-04-12 UA UAA200712236A patent/UA89669C2/uk unknown
- 2006-04-12 AU AU2006233695A patent/AU2006233695A1/en not_active Abandoned
- 2006-04-12 WO PCT/EP2006/003391 patent/WO2006108647A1/de active Application Filing
- 2006-04-12 CA CA002604426A patent/CA2604426A1/en not_active Abandoned
- 2006-04-12 EP EP06742575A patent/EP1868525A1/de not_active Withdrawn
- 2006-04-12 SG SG201002543-5A patent/SG163501A1/en unknown
- 2006-04-12 RU RU2007141653/14A patent/RU2007141653A/ru not_active Application Discontinuation
- 2006-04-12 BR BRPI0607552-5A patent/BRPI0607552A2/pt not_active IP Right Cessation
- 2006-04-12 CN CNA2006800208624A patent/CN101252893A/zh active Pending
- 2006-04-12 JP JP2008505813A patent/JP2008535597A/ja active Pending
- 2006-04-12 US US11/918,562 patent/US20090155736A1/en not_active Abandoned
-
2007
- 2007-10-12 HR HR20070475A patent/HRP20070475A2/xx not_active Application Discontinuation
- 2007-11-06 NO NO20075665A patent/NO20075665L/no not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2006108647A1 * |
Also Published As
Publication number | Publication date |
---|---|
UA89669C2 (uk) | 2010-02-25 |
CN101252893A (zh) | 2008-08-27 |
RU2007141653A (ru) | 2009-05-20 |
AU2006233695A1 (en) | 2006-10-19 |
KR20080015068A (ko) | 2008-02-18 |
WO2006108647A1 (de) | 2006-10-19 |
NO20075665L (no) | 2008-01-14 |
DE102005016939A1 (de) | 2006-10-19 |
HRP20070475A2 (en) | 2008-07-31 |
US20090155736A1 (en) | 2009-06-18 |
CA2604426A1 (en) | 2006-10-19 |
JP2008535597A (ja) | 2008-09-04 |
BRPI0607552A2 (pt) | 2009-09-15 |
SG163501A1 (en) | 2010-08-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2006108647A1 (de) | Verfahren zur herstellung von dentalformteilen | |
EP1021997B2 (de) | Verfahren zur Herstellung von Zahnersatz und dentalen Hilfsteilen | |
EP3538016B1 (de) | Implantat aus faserverstärktem kunststoff | |
EP2945563B1 (de) | Verfahren zur herstellung eines verankerungselements | |
WO2002076325A1 (de) | Expandierendes modellmaterial für zahntechnische zwecke | |
EP3007739B1 (de) | Herstellung von halbzeugen für implantate auf basis von kunststoff | |
EP1579934B1 (de) | Verfahren zur Herstellung einer Muffel für den Fein- oder Modellguss sowie Zusammensetzung zu deren Herstellung | |
EP3016610B1 (de) | Halbzeug zur anfertigung von zahnprothetischen anordnungen, abutment und verfahren zur herstellung von zahnprothetischen anordnungen | |
DE10342231B4 (de) | Rohling zur Herstellung eines Zahnersatzteils und Verfahren zur Herstellung desselben | |
EP1138272B1 (de) | Verfahren zur Herstellung von Zahnersatz | |
WO2021078742A1 (de) | Verfahren zur herstellung von formteilen, insbesondere zahnmedizinischen formteilen | |
EP2139443A2 (de) | Verbundwerkstoff | |
DE4217115C2 (de) | Medizinische keramische Paßkörper, beispielsweise medizinische Implantate, Prothesen und Zahnrestaurationen, sowie ein Verfahren zu ihrer Herstellung | |
DE10205739B4 (de) | Verfahren zum Herstellen eines als Zahnersatz oder Kunstzahn ausgebildeten Keramikteils | |
DE10331017A1 (de) | Calciumphosphat-Kunstharz-Verbundkörper und Verfahren zu dessen Herstellung | |
EP3173227A1 (de) | Freiform-keramikbauteile | |
DE19630412C2 (de) | Verfahren zur Herstellung eines vollkeramischen Dentalaufbaus | |
EP1897514B1 (de) | Vorrichtung und Verfahren zur Herstellung von dentalmedizinischen Formteilen | |
DE202014103288U1 (de) | Muffelform zur Herstellung von zahnprothetischen Formkörpern, daraus hergestellter zahnprothetischer Formkörper und Modell zur Herstellung einer Muffelform | |
DE8000989U1 (de) | Vorrichtung zur herstellung eines spritzgusserzeugnisses | |
DE10313825A1 (de) | Mit einem Dentalimplantat verbindbarer Aufbau | |
EP1027869A2 (de) | Verfahren und Vorrichtung zum Herstellen prothetischen Zahnersatzes durch Giessen | |
DE202004005782U1 (de) | Modellmaterial für zahntechnische Zwecke |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20071025 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20110315 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20110726 |