WO2010009567A2 - Préparation devant être fixée sur une partie dent naturelle ou une dent et son procédé de fabrication - Google Patents

Préparation devant être fixée sur une partie dent naturelle ou une dent et son procédé de fabrication Download PDF

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Publication number
WO2010009567A2
WO2010009567A2 PCT/CH2009/000259 CH2009000259W WO2010009567A2 WO 2010009567 A2 WO2010009567 A2 WO 2010009567A2 CH 2009000259 W CH2009000259 W CH 2009000259W WO 2010009567 A2 WO2010009567 A2 WO 2010009567A2
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WIPO (PCT)
Prior art keywords
filler
polymer matrix
mold
preparation
thermoplastic
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PCT/CH2009/000259
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English (en)
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WO2010009567A3 (fr
Inventor
Jörg Mayer
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Woodwelding Ag
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Publication of WO2010009567A2 publication Critical patent/WO2010009567A2/fr
Publication of WO2010009567A3 publication Critical patent/WO2010009567A3/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/30—Compositions for temporarily or permanently fixing teeth or palates, e.g. primers for dental adhesives
    • 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
    • A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins

Definitions

  • the invention lies in the field of dental medicine and relates to a preparation suitable for being fastened on a natural tooth part or tooth (for example by being anchored in it); in particular it is suitable as an artificial replacement of a load-bearing tooth part (e.g. endodontic restoration).
  • the invention further relates to a method for manufacturing such a preparation.
  • Tooth restorations which proceed from a tooth which is still at least partly present, i.e. from a natural tooth part and in which another natural tooth part is replaced by an artificial tooth part, are e.g. the filling of drilled-out teeth, the insertion of inlays, the placing of crowns, bridges or part-prostheses on natural tooth stumps, the fixing of root pins or similar means for fastening e.g. artificial teeth, bridges or tooth prostheses in natural tooth roots or parts thereof.
  • parts of metals, polymers, ceramic materials or composite materials are fastened on or in the natural tooth part with the help of thermosetting composites and of polymeric cement, respectively.
  • the cements are applied in a viscous condition and are then cured in situ for example with ultraviolet light. After complete curing, these cements can meet (in the same way as the part fastened with the help thereof) the demands of the high loading to which teeth are subjected.
  • the curing of the cements however often entails shrinkage.
  • shrinkage often causes cracks between the natural and artificial tooth parts into which cracks moisture and bacteria penetrate.
  • the polymers lose their ability to creep, and tensions may as a consequence not be released.
  • the cement may swell up due to moisture such damaging the tooth irreversibly.
  • the bacteria cause caries on the natural tooth part.
  • the cured cements are usually very brittle and stress caused by shrinkage and/or swelling cannot be reduced or can be reduced by crack formation only. Due to the above mentioned phenomena tooth fillings fixed with the aid of e.g. polymeric cements are less toxic with respect to amalgam fillings but last less long.
  • gutta-percha 70 to 100 0 C
  • the softening temperature thus limits the material choice.
  • the function of the gutta-percha plug is the sealing of the root canal. The plug is not mechanically loaded at all. Indeed it would not be capable of being mechanically loaded due to the limited mechanical strength of the material, even if it were to contain carbon fibres as suggested in US 4525147.
  • the disclosure US-5803736 also describes production of casts for root canals, in which production shrinkage cannot be tolerated either. It is suggested to use thermoplastic polymers which are applied in a heated and thus plastic condition. For preventing heat damage to the natural tooth part, the polymers to be used are limited to those with a softening temperature of 50 to 70 0 C. Polycaprolactone is suggested as being particularly advantageous as it has a softening temperature of 55 to 65° and a modulus of elasticity of approx. 400 MPa. It is clear that such a polymer cannot be applied for a load-bearing function in the dental field.
  • root pins have a round cross section and a straight axis and are placed in a corresponding bore having a round cross section and a straight axis which bore is produced in the tooth root for placing such a pin. Since the tooth root neither has a round cross section nor a straight axis, the bore and pin may only have very limited dimensions and still, as the case may be, a significant part of the root must be removed by producing the bore. This sets narrow limits on the stability of the fixed root pin.
  • the preparation consists at least partly of a material with thermoplastic properties and it is designed in a manner such that it damps mechanical oscillations very little so that the material is liquefied by way of mechanical oscillation only at locations where stress concentrations arise, as is the case with ultrasound welding.
  • the locations of the stress concentrations are produced by energy directors likewise known from ultrasound welding technology, which are to be provided or present on outer surfaces (also inner surfaces as the case may be) of the preparation, or on surfaces of the natural tooth part in contact with the preparation.
  • a surface to which the material with thermoplastic properties is to be connected namely a surface of a natural tooth part comprising dentin and/or enamel.
  • These surfaces however have structures (macroscopic, microscopic and/or molecular) or are provided with such structures, with which the material liquefied by the mechanical oscillation comes into such intensive contact that after solidification is forms a positive- fit and/or material fit connection with these structures.
  • WO 2008/080239 discloses a method for affixing a dental preparation to a surface of dentine, enamel or other hard tissue or hard tissue replacement material, which includes ultrasonically welding the preparation to pretreated surfaces of the dentine, enamel or other hard tissue or hard tissue replacement material.
  • the pre-treated surfaces may comprise solid bodies of thermoplastic material, weldable to the thermoplastic material of the preparation.
  • the present invention deals with providing dental preparations with thermoplastic properties, and methods of their manufacturing, which dental preparations are for example suitable for being used as preparations of the kind and purpose disclosed in US Patent 6,955,540, the teaching of which is incorporated herein by reference in its entirety, and/or for being used as preparations of the kind and purpose disclosed in WO 2008/080239, also incorporated herein by reference in its entirety.
  • a dental preparation is manufactured and provided, the dental preparation for being fixed on a natural tooth part or tooth, in particular for replacement of a load-bearing tooth part, said preparation being positionable in the natural tooth part or on the natural tooth part or tooth and comprising at least one region or one part of a material with thermoplastic properties, the at least one region forming at least part of the preparation surface, wherein the at least one part of a material with thermoplastic properties comprises a thermoplastic polymer forming a polymer matrix, and further comprising a plurality of filler elements (such as filler particles or fibers etc.) of a material that is solid at the melting temperature of the polymer matrix.
  • the preparation has oscillation properties with damping losses which are so small that local stress concentrations are required for liquefying the material by oscillation, and the preparation is designed in a manner such that the stress concentrations only occur in the region of the preparation surface.
  • the modulus of elasticity of the one named part as a whole is 0.5GPa or more.
  • the modulus of elasticity of the polymer matrix material should not exceed 8 GPa, preferably it should be lower than 6 Gpa, especially preferred between 0.9 GPa and 4GPa.
  • the preparation is positioned on the natural tooth part or tooth to be restored or in this tooth part and is then made to oscillate by suitable means, for example by the sonotrode of an ultrasound apparatus, and at the same time it is pressed against the natural tooth part or tooth.
  • suitable frequencies lie between 2 and 200 kHz (in particular 20 to 80 kHz), suitable oscillation amplitudes between 1 and 200 ⁇ m.
  • thermoplastic material is locally (in particular on its surface in contact with the natural tooth part or close to this surface) liquefied by the oscillations transmitted to the preparation and is brought into intimate contact with the surface of the natural tooth part or tooth, by way of which the positive-fit and/or material-fit connection is produced.
  • the optimal matching of amplitude and power to a specific type of preparation according to the invention is to be determined experimentally.
  • Advantageously amplitude, power and preparation are to be matched to one another in a manner such that there is an optimal transmission of the sound power to the surface of the preparation.
  • At least a part of the surface of the preparation according to the invention consists of the thermoplastic material, wherein on restoration, this surface region is in contact or is able to be brought into contact with a surface of the tooth part to be restored or with a tooth.
  • the preparation may comprise shapings suitable as energy directors in the surface regions of the thermoplastic material, that is to say edges, tips, integrally formed parts or roughnesses which project at least 0.5 ⁇ m beyond the rest of the surface.
  • the function of the energy directors may however also be assumed by a suitable shaping of the tooth part to be restored or of another part of the preparation.
  • connections between the surface of the natural tooth part and the thermoplastic material which are created according to embodiments of the invention relating to the teaching of US Patent 6,955,540 are in particular positive-fit connections produced by pressing the liquefied material into pores and surface unevenness of the natural tooth part.
  • material-fit connections which are caused by adhesive exchange forces, hi all events, for creating the connections intimate wetting of the natural surfaces with the liquefied, thermoplastic material is required.
  • the concerned natural surfaces may be suitably prepared.
  • an enamel surface or a dentin surface may be roughened for achieving a positive fit (advantageous roughness: 0.5 to 500 ⁇ m).
  • the natural surfaces may be pre-treated or etched with a suitable primer for improving wettability of the natural surfaces by the thermoplastic material and/or for achieving increased adhesive exchange forces.
  • Applicable primer systems comprise in a per se known manner chemical reactive compounds reacting with the natural tooth material and/or molecular functionalities cooperating with corresponding functionalities on the side of the thermoplastic material. Such cooperating functionalities are for example matching of polarities of the two sides for increasing exchange forces, interpenetrating oligomers or reactive components which bind the two sides chemically when activated by the oscillations, by light, by heat or by chemical activation.
  • the adhesion to dentine and enamel may be enhanced in addition to the measures taken in the two mentioned and herein incorporated references US 6,955,540 and WO 2008/080239.
  • the dentin and/or enamel may be pre-treated, for example to produce a suitable irregular, retentive surface.
  • An example of such a pre-treatment step is acid etching. More in general, pre-treatment and aspects of dentin and enamel adhesion are described in Shalaby and SaIz (Eds.), "Polymers for
  • the thermoplastic polymer may, in embodiments of all aspects of the invention, be for example polyolefins, polyacrylates, polymetacrylates (including PMMA), polyurethanes, polycarbonates, polyamides, polyesters, polyurethanes, polysulphones, polyaryl ketones, polyimides, polyphenyl sulphides (including polyphenylenesulfide PPS), liquid crystal polymers (LCPs), polyacetals, halogenated polymers, in particular halogenated polyoelefms, polyphenylene sulphides, polysulphones or polyethers. Corresponding copolymers or polymer mixtures are applicable also.
  • An especially preferred material group is the polyamides.
  • a polyamide suitable as material for a dental preparation is polyamide 12 (PAl 2).
  • a further preferred material is liquid crystalline polymers, that have been shown to be promising materials for high load applications in the medical field (see the PhD Thesis ETH No.13090 (ETH Zurich, 2000) by Pierre-Francois K ⁇ ver, the thesis being incorporated herein by reference in its entirety, chapter 12.6 and 12.7 and 12.8 and the references cited therein. Examplse of already tested LCPs are Vectra A950 and Vectra B950.
  • the materials or material systems which may be used in the preparation according to the invention must have sound-conducting properties and a sufficiently low damping so that the preparation is capable of oscillating.
  • the loss factor should be sufficiently high for liquefaction in the regions of stress concentrations. It has been found that for the tooth restoration according to the invention thermoplastic materials with softening temperatures of up to approx. 350° (the melting temperature of PEEK) are applicable, wherein the mechanical oscillations are to be applied for approx. 0.1 to 10 sec. Heat quantity and exposure time remain so small that thermal damage of the dentin or the surrounding vital tissue is not to be expected.
  • thermoplastic properties thermoplastic properties
  • thermoplastic materials thermoplastic materials
  • materials with thermoplastic properties thermoplastic properties
  • the regions of the preparation surface via which the oscillations are coupled into the preparation are advantageously to be designed such that no stress concentration arises there.
  • the filler elements may be filler particles of essentially heterogeneous or approximately round shapes, or they may be filler particles of whisker or fiber shape (short fibers or long fibers). According to a special embodiment, they may comprise non-particulate elements such as continuous fibers (preferably grouped together into at least one fiber strand) essentially ranging over an entire length of the preparation.
  • Suitable carbon fiber reinforcement fillers include AS4, IM7, T800, and TlOOO.
  • Fiber fillers are the carbon-based reinforceing additives discussed in chapter 13.8 of the PhD Thesis ETH No.13090 by Pierre-Francois K ⁇ ver. These materials include graphite whiskers, carbon fibers, and Fullerene-type carbon nanotubes.
  • suitable fillers are non-fibrous particulate fillers.
  • Such fillers may include suitable oxides, such as Zirconia, Tantantalum Oxide, silica, Titanium Oxide (TiO 2 ) etc.
  • suitable fillers includes the minerals such as Bentonite or modified bentonite, for example of the kind referred to in chapter 13.9 of the PhD Thesis ETH No.13090 by Pierre-Francois K ⁇ ver.
  • the preparation comprises at least 40% (weight percent), preferably at least 50%, and especially preferred at least 55% or at least 60% or at least 65% filler elements.
  • Preferred values for filler material maxima are 85%, especially preferred at most 80% or at most 75% filler material.
  • thermoplastic polymer material and the filler material was carefully mixed by hand before drying. After drying, the mixture was supplied to an injection molding setup (injection molding machine: Arburg 270S with a 18 mm screw auger.
  • injection molding machine Arburg 270S with a 18 mm screw auger.
  • the following table shows the injection molding parameters for the investigated matrix materials.
  • the matrix material was in pure quality.
  • the following fillers were used. "US-Fine" silicate fillers, Schottglass GM27884 K6 (3 ⁇ m particles of a Ba-Al-Borosilicate), pure and mixed with Schottglass GM27884 UF0.4 ⁇ m (0.4 ⁇ m particles of a Ba-Al- Borosilicate) in a ratio of 4:1, Zeeospheres W-210 ex 3M 5 Silbond FW600 EST, spherical silica nanoparticles (size below 100 nm). Polycarbonate was only filled by the US-Fine filler, the other fillers were used both, to for a PA 12 matrix and a PVC matrix. A filling grade of 50% (weight percent) was chosen in all variants of this example.
  • Attritional wear was found to be low comparable to and even lower than wear of human enamel versus human enamel (attrition of specimens and antagonists added).
  • small negative wear values indicative of water sorption were found. The best results in this respect were obtained with silica filled PVC samples.
  • the tested materials were found to be well suited for long-time use in dental preparations.
  • Inorganic nanoparticles are a promising group of inorganic fillers for dental preparations.
  • the dental preparation should preferably have a high transparency (in order to avoid visible dark spots or borders), and preferably they should have a high radioopacity in order to be well recognisable in x-ray images.
  • a) Choose a suitable polymer matrix and a filler material with indices of refraction that match as closely as possible (for example choose a polymer matrix material and choose a binary system such as (Ta 2 OsVSiO 2 particles and adapt the relative concentration x for the binary system for the index of refraction to approximately correspond to the index of refraction of the matrix)
  • the production method may for example include a thermal spraying method, such as flame spraying (according to a special embodiment, the production parameters are furthermore adapted so that the nanoparticles in themselves exhibit a low crystallinity).
  • a surface functionalization may take place, for example by chemically modifying the surface properties of the filler particles.
  • the surface may be provided with functional groups that are capable of incurring hydrogen bonds with the polymer matrix material and thus produce an affinity of the filler to be well dispersed in the polymer matrix.
  • a teaching of how the surfaces of Ta 2 OsZSiO 2 particles can be modified, by wet chemical steps or by functionalization in the gas phase, for can be found in the named PhD Thesis ETH 17188 by Heiko Schulz.
  • a special class of suitable inorganic fillers are, therefore, oxide nanoparticles, such as Ta-oxide-Si-Oxide particles.
  • a method of their manufacturing can be found in the PhD Thesis ETH 17188 by Heiko Schulz, chapter 2, and pages 54 and 83.
  • Tantalum Oxide or Zirconium Oxide and/or Titanium Oxide and/or Silicon Oxide based nano-particulate filler materials are proposed.
  • Nanoparticles in the context of this text are paricles of sizes between 1 nm and 1000 nm, preferably between 1 ran and 100 ran.
  • flame spray pyrolysis made nanoparticles with 0-100% wt.% Ta 2 Os further containing SiO 2 are proposed.
  • the determination of a suitable material and its manufacture may according to an example therefore comprise at least some of the steps of:
  • an appropriate solvent such as an aliphatic compound, for example alcohol, for example isopropanol or a higher order aliphatic alcohol,
  • a mechanical blending that may be a 'mechanical alloying' step
  • a mechanical blending step to blend the thermoplastic polymer with the powder, for example in an attritor, for example using mechanically hard particles (such as stainless steel spheres) for enhancing the blending effect
  • the sintered product may be coarsely grinded before being fed to an auger (extruder); If not grinded, optionally granulate the mixture, for example by dribbling it on a rotating disc
  • the mechanical blending step is a distinctive feature of the use of an approach according to the invention.
  • the blending step may include ultrasonication, but preferably includes the charging of the mixture with higher forces, such as in an attritor or similar.
  • the next section of this text deals with the preparation of a material conglomerate; the teaching of the next section may be combined with the above, but is also useful if applied to other particulate filler materials, for example non-transparent, filler materials.
  • translucency of the matrix material itself is also an issue.
  • One approach to obtain a good translucency is to use amorphous polymers, such as PA in amorphous qualities.
  • thermoplastic polymer matrices are, even above their melting point, more viscous than available thermosetting materials in an uncured state, the adding of filler elements in a high concentration of for example more than 50 weight % to the thermoplastic polymer matrix, as is advantageous for the here disclosed dental preparations, is not trivial.
  • a conglomerate subsequently used for manufacturing a dental preparation is manufactured by providing a strand of continuous fibers impregnated by a thermoplastic polymer matrix (not unlike a 'prepreg' material, but with a thermoplastic material), and then the strand is subsequently chopped into small pellets.
  • the fiber strand may optionally be consolidated at an elevated temperature, for example in a hot press.
  • the plurality of resulting chopped pellets may optionally be kept at a temperature above the melting temperature and stirred in an according vessel, before being cooled or directly fed to a injection molding setup.
  • the chopped pellet conglomerate may directly be feed to a conveying unit that injects the conglomerate into the mold.
  • thermoplastic-polymer-filler conglomerate According to a second embodiment, that may optionally be combined with the first embodiment (as a second mixing step), the following method of preparing a thermoplastic-polymer-filler conglomerate is suggested:
  • step c) the mixture is suspended in a solvent, which solvent is removed (after step d), for example by drying at room temperature or at an elevated temperature.
  • a solvent may be chosen so that the Zeta potential of the polymer matrix material and of the filler particles impedes agglomeration at least of the filler particles.
  • the Zeta potential may also be such that the polymer matrix and the filler particles do not repulse each other.
  • the Zeta potential of the filler material may have an absolute value of at least 25 mV, and the Zeta potential of the polymer matrix may have the opposite sign.
  • the bodies between which portions of the mixture are compressed in step d) include, for example, hard spheres, such as steel spheres; there may also be mechanisms where one of the bodies between which the material is compressed is a vessel wall.
  • steps d) methods known from metallurgy for mechanical alloying may be used, for example milling (there exist various milling machines, including planetary milling machines, pan milling machines, etc., attritor processing, vibrating apparatus with at least one hard body (such as a sphere) in the vibrating vessel, grinding, etc.
  • the resulting mixture may be granulated and supplied to an extruder, which may optionally be used for feeding the resulting conglomerate to an injection molding apparatus.
  • FIG. 1 An example of a set-up for carrying out a method of preparing a thermoplastic- polymer-filler conglomerate for manufacturing a dental preparation is illustrated in Figure 1.
  • the reference numerals denote: 1 : polymer matrix material (granulate), 3: polymer matrix material grinder, 5: vessel for pre-mixing the constituents, 7: solvent, 9: filler powder, 11 : attritor, 13: rotating disc for granulation, 15: resulting conglomerate granulate, 17: extruder.
  • a drying stage which may be between the attritor and the granulation stage.
  • Reversed integration Adding the polymer matrix to the filler which is immersed in a solvent, such as Ethanol, instead of pouring the filler powder into the polymer material powder immersed in a solvent. After the adding of the polymer matrix, the resulting conglomerate is stirred and/or treated by ultrasound processing and/or treated in an attritor (see below). After the mixing and prior to the injection molding or extrusion, the mixture may be dried to remove the possible solvent.
  • a solvent such as Ethanol
  • a method of manufacturing a dental preparation suitable of being fastened on a natural tooth part or tooth, and a dental preparation manufactured by such method including injection molding the dental preparation from a thermoplastic polymer and at least one filler comprising a plurality of filler elements.
  • Injection of the thermoplastic polymer into the mold is carried out at a temperature at which the thermoplastic polymer is liquid (the here used definition of the term "liquid” includes all states in which the viscosity of the thermoplastic polymer makes possible deformation to a degree that allows injecting the polymer into the mold), and at which the filler elements are solid.
  • the deformable thermoplastic polymer material and the filler elements may be pre-mixed before they are injected into the mold.
  • at least a portion of the filler elements may be added to the mold before the thermoplastic polymer is injected.
  • the method according to this aspect of the invention comprises the steps of:
  • thermoplastic polymer having a polymer melting temperature or melting temperature range
  • the method according to this aspect of the invention allows to pre-fabricate dental preparations of a filled polymer matrix, which preparations approximately fit the shape of a cavity to be filled or a tooth part to be replaced. Because of their thermoplastic properties, the method of US Patent 6,955,540 or of WO 2008/080239 may be used to in situ tailor the dental preparation to the shape of the cavity to be filled and/or to the shape of the remaining tooth part, and to anchor the dental preparation at the remaining tooth part.
  • the orientation of the fiber fillers is optimized in the injection molding process. Especially, it is possible to orient the fiber parallel to a mould surface along a flow direction.
  • Preparation with thus oriented fibers are especially advantageous and useful if they are of a shape and purpose that includes a certain anisotropy.
  • a special class of such preparations are the root pins, in which it has been found to be desirable under certain circumstances that the fibers are oriented parallel to the proximodistal axis.
  • the opening in the mold cavity into which the pre-mixed fiber-matrix- conglomerate (the "melt") is injected may be arranged at a proximal or distal end thereof;
  • the temperature of the mold is kept below the melting temperature of the thermoplastic matrix during injection molding;
  • the temperature of the melt is close to its melting temperature and not substantially above it, for example the temperature of the melt is not higher than
  • the injection velocity/the flow volume is/are kept low
  • the holding pressure is high.
  • the mold may comprise, in addition to a first opening in which the melt is injected, a second opening at an opposite side of the mold.
  • the injection molding may then take place in a flow-through manner, thus melt is injected from one side, and is pushed through the mold and exits on the other side.
  • this may be done in a unidirectional push-out injection molding process, where some of the molten material that has flown via the first opening into the mold and through it exits through the second opening and into a overflow volume.
  • This may, according to different variants, be done into a sufficiently large overflow volume that does not restrict the volume of overflow material, or in a manner in which an out-flow-gate is controlled and an outflow rate is adjustable.
  • the flow-through injection molding may be done by push-pull injection molding, where after melt injection, the melt is subject to a plurality of push-pull strokes from the two different mold openings (the portion of the melt that has not yet solidified is moved to and fro in the mold).
  • Figures 2, 3 and 4 show variants of flow-through injection molding of dental preparations, particularly of root pins.
  • the mold 21 has two openings 23, 25 serving as inlet and outlet openings.
  • the variant of Figure 2 comprises a single injection unit 17 (extruder), and an overflow volume 27 in which material exiting through the second opening may flow.
  • the overflow volume 27 distinguishes the set-up from classical injection molding setups.
  • the variant of Figure 3 is of the push-pull type with an injector 17 on both sides.
  • the variant of Figure 4 is of a same principle as the one of Figure 2, but with means 39 for adjusting the outflow, for example valve means, and/or a piston in the overflow volume.
  • the material properties of the material injected may be chosen to vary as a function of time (and thus as a function of filling of the mold).
  • the filler content may vary from an initially low grade (of for example between 0% and 50% (filler contents are weight percents in this text)) to a later high grade (of for example between 50% and 80%).
  • the resulting preparation will have a shell of a thermoplastic polymer rich conglomerate and a core region in which the filler material predominates.
  • the thermoplastic polymer shape may be beneficial in view of the fastening process by means of mechanical vibrations liquefying portions of the preparation.
  • the mold may be only partially filled by the conglomerate leaving a hollow pre-fabricated element which may be filled with further material (such as a thermosetting polymer core), or which may be put over a solid core, etc.
  • the filler elements may include continuous fiber strands.
  • Such continuous fiber strands may be provided in the form of pre-impregnated fiber strands placed in the mold cavity before the injection process and held therein by appropriate holding means (such as holding means of the cavity).
  • Such fiber strands may increase the mechanical stability considerably, and may be suitable for example for dental preparations that should withstand pulling forces.
  • the filler elements may comprise at least one of an inlay of Titanum or Zirconia or PEEK/IM7 and/or elements (fabricated) according to the teachings of WO 99/61081 or WO 96/19336.
  • Continuous fibers in the context of the present are fibers with fiber lengths corresponding to a length of the preparation and ranging essentially through a full cross section of the preparation.
  • the preparation may be subject to residual stress annealing after the injection molding process.
  • the invention features, according to a further aspect, a method of carrying out a dental restoration, the method comprising the steps of providing a plurality of preparations, for example made by any one or any combination of the above- described methods, the preparations being of defined, different shapes, of determining the at least approximate size and shape of a cavity to be filled or tooth part to be replaced, the preparations comprising thermoplastic material, of choosing an approximately fitting preparation of the plurality of preparations, and of fastening the chosen preparation to a remaining tooth part using mechanical vibrations to at least partially liquefy the thermoplastic material while at least a portion of the thermoplastic material is in contact with dentine and/or enamel and/or an already- produced filling body.

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  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Plastic & Reconstructive Surgery (AREA)
  • Dental Preparations (AREA)

Abstract

Selon différents aspects de la présente invention, une préparation dentaire est fabriquée. La préparation dentaire doit être fixée sur une partie dent naturelle ou une dent, en particulier pour le remplacement d’une partie dent porteuse. Ladite préparation est positionnable dans la partie dent naturelle ou sur la partie dent naturelle ou la dent et comprend au moins une région ou une partie d’un matériau présentant des propriétés thermoplastiques, la ou les régions formant au moins une partie de la surface de préparation, la ou les parties d’un matériau présentant des propriétés thermoplastiques comprenant un polymère thermoplastique formant une matrice polymère, et comprenant en outre une pluralité d’éléments de charge (tels que des particules ou des fibres de charge, etc.) d’un matériau qui est solide à la température de fusion de la matrice polymère.
PCT/CH2009/000259 2008-07-25 2009-07-21 Préparation devant être fixée sur une partie dent naturelle ou une dent et son procédé de fabrication WO2010009567A2 (fr)

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US8363608P 2008-07-25 2008-07-25
US61/083,636 2008-07-25

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3021521A1 (fr) * 2014-05-30 2015-12-04 Rech S Tech Dentaires Rtd Soc D Tenon dentaire en materiau composite a base de polymere thermoplastique
RU2609870C2 (ru) * 2011-07-13 2017-02-06 КАДОРЕЛЬ Катрин Композитная деталь для внутрикостной имплантации и способ изготовления такой детали
US9807701B2 (en) * 2011-01-13 2017-10-31 Google Technology Holdings LLC Inter-modulation distortion reduction in multi-mode wireless communication terminal

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