US20050106534A1 - Ceramic dental implant - Google Patents
Ceramic dental implant Download PDFInfo
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- US20050106534A1 US20050106534A1 US10/496,814 US49681404A US2005106534A1 US 20050106534 A1 US20050106534 A1 US 20050106534A1 US 49681404 A US49681404 A US 49681404A US 2005106534 A1 US2005106534 A1 US 2005106534A1
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- anchoring part
- dental implant
- anchoring
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- implant
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0012—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the material or composition, e.g. ceramics, surface layer, metal alloy
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0012—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the material or composition, e.g. ceramics, surface layer, metal alloy
- A61C8/0013—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the material or composition, e.g. ceramics, surface layer, metal alloy with a surface layer, coating
- A61C8/0015—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the material or composition, e.g. ceramics, surface layer, metal alloy with a surface layer, coating being a conversion layer, e.g. oxide layer
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0012—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the material or composition, e.g. ceramics, surface layer, metal alloy
- A61C8/0013—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the material or composition, e.g. ceramics, surface layer, metal alloy with a surface layer, coating
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0018—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the shape
- A61C8/0022—Self-screwing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
- A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
- A61C8/0066—Connecting devices for joining an upper structure with an implant member, e.g. spacers with positioning means
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
- A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
- A61C8/0069—Connecting devices for joining an upper structure with an implant member, e.g. spacers tapered or conical connection
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
- A61C8/0075—Implant heads specially designed for receiving an upper structure
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/53—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone involving the removal of at least part of the materials of the treated article, e.g. etching, drying of hardened concrete
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/91—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics involving the removal of part of the materials of the treated articles, e.g. etching
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0018—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the shape
- A61C8/0037—Details of the shape
- A61C2008/0046—Textured surface, e.g. roughness, microstructure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0089—Implanting tools or instruments
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00836—Uses not provided for elsewhere in C04B2111/00 for medical or dental applications
Definitions
- the invention relates to a dental implant comprising an anchoring part for anchoring within the bone and comprising a mounting part for receiving an element to be attached, such as an abutment or a crown, a bridge or a prosthesis construction.
- Dental implants have been successfully used since more than 10 years.
- the major part of the dental implants currently used consist of titanium, since titanium has a sufficiently low elastic modulus and also has a relatively large strength.
- a safe integral osteogenesis can be reached when the surface is suitably treated (e.g. roughened by sand blasting).
- the titanium implants after reaching a primary stability by screwing into the bone, safely ossify within a healing time of about 3 to 4 months so that a permanent bond between the anchoring part screwed into the bone and the bone is guaranteed.
- two-part implants are utilized. Basically, there are two possibilities for this end:
- the anchoring part of the implant is embedded until the bone ridge so that the mucoperiost cover can be sewn above the implant.
- a drawback is the necessary secondary operation at the end of the primary healing phase for allowing a subsequent application of a mounting part and thereon the desired prosthesis or crown.
- the anchoring part of the implant can be sunk in up to about 3 mm above the bone ridge at mucosal level, thus avoiding a secondary operation.
- the wound edges can be directly adapted to the implant neck portion, thereby effecting a primary soft tissue closure to the implant.
- Such a two-part implant construction for an open transgingival system is e.g. marketed by Institut-Straumann AG, Waldenburg/Switzerland under the mark ITI®DENTAL IMPLANT SYSTEM.
- Both the anchoring or primary part which is implanted transgingivally, as well as the assigned construction parts herein consist of pure titanium.
- the titanium surface is either coarsely sand blasted or is coated with titanium by thermal spraying. Both surfaces guarantee a good ossification or integrating osteogenesis.
- Ceramic abutments offer particular advantages during the subsequent matching of the supra-construction, such as bridges or crowns, to the abutment, They can be simply ground and allow to build constructions using prior art processes known to the dentist. Ceramic abutments offer particular advantages due to the fact that their color can be closely matched to the natural tooth color. Lately also abutments of zirconia have been developed which offer a particularly high strength.
- Such a system consisting of two-part implants having an anchoring part and a mounting part, an abutment and a prosthesis applied thereon offers a good matching to the geometric situation for different indications, however, generally the multitude of the components used is detrimental for the mechanical stability of the total system. Also each further bonding leads to possible starting points for bacteria which may cause parodontitis or gingivitis within the gap.
- zirconia ceramics have become available that have an extremely high strength, in particular when the shaped bodies are prepared by hot isostatic pressing or by subsequent hot isostatic densifying,
- Such a zirconia ceramic which may roughly comprise 92.1-93.5 wt.-% ZrO 2 , 4.5-5.5 wt.-% Y 2 O 3 and 3.8-2.2 wt.-% HfO 2 , is for instance known from U.S. Pat. No. 6,165,925.
- zirconia ceramic as a material for making the anchoring part of an implant seems not possible, since a sufficient mechanical stability of the zirconia ceramic is necessary, this requiring a highly dense preparation, practically without any porosity to be measured, this simultaneously leading to a clean cut extremely hard surface.
- Such a material is bio-inert, so that no integrating osteogenesis is to be expected, this is why this material is not regarded to be suitable for the preparation of an anchoring part of an implant.
- a dental implant comprising an anchoring part for anchoring within the bone, and comprising a mounting part for receiving an element to be applied, wherein the anchoring part and the mounting part are integrally made of a material based on zirconia, and wherein at least the anchoring part is pre-treated at its outer surface by a subtractive removing process, or is provided with a coating, whereby an ossification is facilitated.
- this object is achieved by a process for making a dental implant, wherein initially a base body having an anchoring part for anchoring within the bone and a mounting part for receiving an element to be applied, is provided integrally from a material based on zirconia, and wherein subsequently at least the anchoring part is pre-treated at its outer surface at least partially by a subtractive, removing process or is coated with a coating that facilitates ossification.
- a one-part dental implant having an anchoring part and a mounting part can be prepared that consists of a material based on zirconia and which still guarantees a good ossification during healing time.
- the mounting part can be approximated to the natural tooth color and thus in particular in the visible region allows the preparation of completely natural looking ceramic reconstructions.
- the mounting part can be directly ground which allows a simple and advantageous adaptation of the additional elements to be applied. Possibly additional abutments may become superfluous.
- DE 28 38 759 A1 it is basically known to provide an implant consisting of metal, plastic or ceramic with a layer system consisting of a passivating layer and/or of several physiologically active layers.
- a passivating layer of silicon nitride and a physiologically active layer of calcium fluoride, of ⁇ -alanin, of carbon or the like is contemplated.
- the implant according to the invention is applied transgingivally.
- the soft tissue attachment developing the biological breadth is not disturbed by a secondary operation such as occurring with systems that heal with covered mucous linings.
- a primary treatment by applying a temporary measure directly onto the mounting part is made possible.
- a sufficient primary stability e.g. by screwing the anchoring part into a bone bore
- only measures must be taken to avoid in particular sharing motions during the subsequent healing time.
- this can be effected by a blocking, while with single implants this can be effected by an attachment to adjacent teeth or to prosthetic parts partially by applying adhesive.
- the anchoring part comprises a threaded section.
- the implant according to the invention can be implanted with the necessary primary stability so that subsequently to the implantation directly a primary treatment is made possible by applying a temporary measure.
- the anchoring part at its outer surface is at least partially roughened by a removing process or is micro-structured.
- Such a surface structuring guarantees that the zirconium oxide material which would otherwise be bio-inert can reach an integral osteogenesis with the bone material.
- the dental implant in the region of the anchoring part has a maximum surface roughness between 1 and 20 ⁇ m, preferably between 2 and 15 ⁇ m, in particular between 4 and 12 ⁇ m, particularly preferred between 6 and 12 ⁇ m.
- an abrasive blasting such as sand blasting (using corundum), a blasting with boron carbide particles, or a high-pressure water blasting, is possible.
- abrasive blasting such as sand blasting (using corundum)
- a blasting with boron carbide particles or a high-pressure water blasting
- a hard material for blasting such as boron carbide particles which is considerably costly, however.
- an initial blasting treatment such as sand blasting with Al 2 O 3
- a subsequent etching treatment using phosphoric acid, sulphuric acid, hydrochloric acid or mixtures thereof.
- the blasting treatment may be performed using a pressure between about 1 bar and 10 bars, preferably between 2 and 6 bars, in particular between 3 and 5 bars.
- an etching treatment is desired using phosphoric acid of 10 to 90 vol.-%, preferably of 15 to 50 vol.-%, in particular of 20 to 40 vol.-%.
- the etching may e.g. be performed for a time of 10 seconds to 10 minutes, preferably between 10 and 120 seconds, in particular between about 15 to 60 seconds.
- the etching treatment suitably is followed by a cleaning step, such as rinsing within a NaCl solution and subsequent rinsing in deionized water.
- the anchoring part at its outer surface is at least partially provided with a bio-active coating.
- This may for instance be a silanizing or a hydroxylation which also facilitates osteogenesis
- the anchoring part is at least partially coated with a metallic or ceramic coating or with a cermet coating.
- the anchoring part may e.g. be coated by thermal spraying, by CVD or by PVD.
- a coating consisting of titanium or of a titanium alloy is regarded as advantageous, which possibly may be applied by thermal spraying.
- the bio-compatibility of titanium having been known since years, can be utilized for reaching a safe integral osteogenesis of the anchoring part during the healing phase.
- the titanium possibly applied by thermal spraying has a sufficient micro-structuring to avoid a distant osteogenesis and to guarantee a safe ossification.
- the region within the anchoring part is coated that will be recessed within the bone during implantation.
- the advantageous aesthetics of the zirconia-based ceramic in the region of the mounting part can be combined with the advantageous bio-compatibility of titanium.
- the mounting part comprises a support for applying a screwing tool.
- the mounting part may be designed for positive fitting of a screwing tool, such as basically already known in the art.
- the dental implant can be designed with all kinds of implant shapes already known or to be developed.
- the mounting part may be configured as an extension of the anchoring part or may be offset with respect to the anchoring part.
- the mounting part may have a frusto-conical basic shape, this facilitating an adhesive attachment of abutments for prosthesis constructions.
- the dental implant is stored in a suitable liquid, such as deionized water, after a previous activation of its surface, such as by silanizing or hydroxylation or by an etching treatment, before it is implanted by the doctor.
- a suitable liquid such as deionized water
- the dental implant may be stored within a container, preferably without air access.
- a zirconia ceramic prepared in this way may for instance be processed by grinding to the desired shape of the dental implant and may be subsequently surface-treated to reach the desired surface characteristics.
- FIG. 1 a side view of a first embodiment of an implant according to the invention
- FIG. 2 a side view of an embodiment of an implant according to the invention slightly modified with respect to the embodiment of FIG. 1 ;
- FIG. 3 a side view of a further embodiment of an implant according to the invention wherein the mounting part is slightly offset with respect to the anchoring part;
- FIG. 4 a REM photograph of a test specimen of an implant which has been implanted into a patient and which has been removed together with the adjacent bone material using a drill after a healing period of about 3 months.
- FIGS. 1-3 several possible embodiments of a one-part dental implant according to the invention are depicted, this being purely exemplary without limiting the scope of the invention to any kind of shape of the implant.
- a dental implant according to the invention is designated in total with numeral 10 . It comprises an anchoring part 12 having a threaded section 14 and a rounded lower end.
- the anchoring part 12 at its upper end transitions via a slightly enlarged conical section 16 to the outside into a mounting part 18 being integral therewith and extending within an extension of the longitudinal axis 24 of the threaded section 14 .
- the mounting part 18 has a frusto-conical or a conical shape and is provided with a flattening 20 at one side thereof. At the side opposite the flattening 20 there is provided a groove 22 within the outer surface that extends from the upper front surface of the mounting part 18 toward the lower side and ends in a conical section which forms the transition to the conical section 16 of the anchoring part 12 .
- the flattening 20 in combination with the groove 22 located on the opposite side functions to provide a positive attachment of a screwing tool which has a plug-in seat matched thereto.
- FIG. 2 shows a slightly modified embodiment of a dental implant designated in total with numeral 30 which again comprises an anchoring part 32 having a threaded section 34 being followed by a conical mounting part 38 on which the groove 42 can be seen, since the dental implant 30 is depicted rotated by 90° with respect to the dental implant 10 of FIG. 1 .
- the dental implant 30 does not have a conical section within the transitional region between the anchoring part 32 and the mounting part 38 .
- the mounting part 38 is configured as a conical section directly adjoining the anchoring part 32 which is shaped cylindrically. Again on the side opposite to the groove 42 a respective flattening may be provided, such as can be seen in FIG. 1 .
- FIG. 3 a modified embodiment of the dental implant is designated in total with numeral 50 .
- the dental implant 50 comprises an anchoring part 52 corresponding to the embodiment according to FIG. 1 and having a threaded section 54 which transitions via an outer conical section 56 into a mounting part 58 .
- the mounting part 58 has a conical basic shape, however, is offset with respect to the longitudinal axis of the anchoring part 52 , e.g. by an angle of about 15°, this being particularly suitable for applications within the incisor region in many cases.
- a suitable recess 60 at the outer surface of the mounting part 58 a positive engagement of a screwing tool is made possible to also allow to screw into a bone bore this dental implant having an offset mounting part.
- the anchoring part may e.g. have an axial length of 10 mm, wherein the other dimensions result in a corresponding manner.
- the dimensions and the shane may be modified in a suitable way, depending on the respective indication.
- the dental implants 10 , 30 , 50 according to the invention are prepared integrally from a zirconia ceramic which e.g. may be a stabilized zirconia ceramic having 92.1 to 93.5 wt.-% ZrO 2 and 4.5 to 5.5 wt.-% Y 2 O 3 and 1.8 to 2.2 wt.-% HfO 2 according to U.S. Pat. No. 6,165,925 mentioned at the outset.
- a stabilized zirconia ceramic in particular, when prepared by hot isostatic pressing or by sintering with subsequent hot isostatic densification offers a particularly high mechanical stability and strength. Also the utilization of any other zirconia ceramics is conceivable.
- the anchoring part at its outer surface thereof has been treated by a suitable removing pretreatment or by a suitable coating to thereby reach a good integral osteogenesis after implantation.
- the anchoring part may be silanated or hydroxylated or may be roughened by a removing process or may be micro-structured.
- an integral osteogenesis can be reached.
- a coating by thermal spraying consisting of pure titanium having a layer thickness of about 20 to 100 ⁇ m.
- a safe integral osteogenesis can be reached during healing time, wherein simultaneously the advantages of zirconia ceramic, such as grinding possibility and a color approximated to the natural tooth can be utilized.
- test implant samples according to FIG. 4 were prepared from a zirconia ceramic according to U.S. Pat. No. 6,165,925 and were processed by grinding to yield the shape according to FIG. 4 .
- the test implant sample 70 shown in FIG. 4 was implanted into a patient. After a healing time of about 3 months the test implant sample was removed together with a small amount of the surrounding bone material using a hollow drill and was analyzed histologically with respect to osteointegration. It was found that an integrating osteogenesis can be reached.
- Additional improvements with respect to an integrating osteogenesis already after short healing time are particularly expected when using increased surface roughnesses in the range of about 5 to 15 ⁇ m R max to which end in particular a subsequent treatment of the blasted surface by etching with phosphoric acid is contemplated.
- the surface roughness can be increased to 5 to 15 ⁇ m R max (in particular to about 8 to 12 ⁇ m, depending on the previous blasting treatment).
- the activation of the surface reached by etching facilitates an osteointegration.
Abstract
Description
- The invention relates to a dental implant comprising an anchoring part for anchoring within the bone and comprising a mounting part for receiving an element to be attached, such as an abutment or a crown, a bridge or a prosthesis construction.
- Dental implants have been successfully used since more than 10 years. The major part of the dental implants currently used consist of titanium, since titanium has a sufficiently low elastic modulus and also has a relatively large strength. In addition, it is of particular importance that when using titanium as an implant material a safe integral osteogenesis can be reached when the surface is suitably treated (e.g. roughened by sand blasting). This means that the titanium implants, after reaching a primary stability by screwing into the bone, safely ossify within a healing time of about 3 to 4 months so that a permanent bond between the anchoring part screwed into the bone and the bone is guaranteed. Herein usually two-part implants are utilized. Basically, there are two possibilities for this end:
- According to a closed sub gingival system the anchoring part of the implant is embedded until the bone ridge so that the mucoperiost cover can be sewn above the implant. Herein a drawback is the necessary secondary operation at the end of the primary healing phase for allowing a subsequent application of a mounting part and thereon the desired prosthesis or crown.
- By contrast, when using the open transgingival system, then the anchoring part of the implant can be sunk in up to about 3 mm above the bone ridge at mucosal level, thus avoiding a secondary operation. The wound edges can be directly adapted to the implant neck portion, thereby effecting a primary soft tissue closure to the implant.
- Such a two-part implant construction for an open transgingival system is e.g. marketed by Institut-Straumann AG, Waldenburg/Switzerland under the mark ITI®DENTAL IMPLANT SYSTEM. Both the anchoring or primary part which is implanted transgingivally, as well as the assigned construction parts herein consist of pure titanium. To guarantee a good ossification the titanium surface is either coarsely sand blasted or is coated with titanium by thermal spraying. Both surfaces guarantee a good ossification or integrating osteogenesis.
- Thereafter onto the mounting part of such implants prosthesis elements, such as bridges or crowns, are usually screwed or cemented usually using intermediate so-called abutments. Lately to this end also ceramic abutments have been developed that are applied onto the mounting part.
- Ceramic abutments offer particular advantages during the subsequent matching of the supra-construction, such as bridges or crowns, to the abutment, They can be simply ground and allow to build constructions using prior art processes known to the dentist. Ceramic abutments offer particular advantages due to the fact that their color can be closely matched to the natural tooth color. Lately also abutments of zirconia have been developed which offer a particularly high strength.
- Such a system consisting of two-part implants having an anchoring part and a mounting part, an abutment and a prosthesis applied thereon offers a good matching to the geometric situation for different indications, however, generally the multitude of the components used is detrimental for the mechanical stability of the total system. Also each further bonding leads to possible starting points for bacteria which may cause parodontitis or gingivitis within the gap.
- However, from an aesthetic point of view in particular in the front visible region it would be desired to make all transgingival parts, also the anchoring part, of ceramic. However, a screw connection between metal (anchoring part of titanium) and ceramic (mounting part) cannot be realized, inter alia, due to the differences in the coefficients of thermal expansion. By contrast, up to now anchoring parts made of ceramic could riot pervade, since these usually do not have the necessary mechanical stability.
- Lately also zirconia ceramics have become available that have an extremely high strength, in particular when the shaped bodies are prepared by hot isostatic pressing or by subsequent hot isostatic densifying, Such a zirconia ceramic which may roughly comprise 92.1-93.5 wt.-% ZrO2, 4.5-5.5 wt.-% Y2O3 and 3.8-2.2 wt.-% HfO2, is for instance known from U.S. Pat. No. 6,165,925.
- However, the application of zirconia ceramic as a material for making the anchoring part of an implant seems not possible, since a sufficient mechanical stability of the zirconia ceramic is necessary, this requiring a highly dense preparation, practically without any porosity to be measured, this simultaneously leading to a clean cut extremely hard surface.
- Such a material is bio-inert, so that no integrating osteogenesis is to be expected, this is why this material is not regarded to be suitable for the preparation of an anchoring part of an implant.
- From DE 195 30 981 A1 a pre-manufactured fully ceramic implant supra construction of zirconia is known for the design of artificial crown frustums of tooth color attached to implants. Although herein some kind of advantages with respect to the aesthetic of zirconia ceramic and possibly with respect to a simplified preparation for the design of the supra construction is made possible, however also this implant construction bears the basic disadvantages that rest with multiple-part implant constructions. Namely, since the actual implant consists of titanium, the same problems as before result within the bonding region between the implant and the supra construction made of zirconia ceramic.
- Thus, it is the object of the invention to avoid the drawbacks of the prior art and to provide an improved dental implant which guarantees a high mechanical stability of the total system and which simultaneously allows to exploit the advantages of ceramics in particular in the visible region. Also a suitable process of making such a ceramic shall be disclosed.
- According to the invention, this object is achieved by a dental implant comprising an anchoring part for anchoring within the bone, and comprising a mounting part for receiving an element to be applied, wherein the anchoring part and the mounting part are integrally made of a material based on zirconia, and wherein at least the anchoring part is pre-treated at its outer surface by a subtractive removing process, or is provided with a coating, whereby an ossification is facilitated.
- In addition, this object is achieved by a process for making a dental implant, wherein initially a base body having an anchoring part for anchoring within the bone and a mounting part for receiving an element to be applied, is provided integrally from a material based on zirconia, and wherein subsequently at least the anchoring part is pre-treated at its outer surface at least partially by a subtractive, removing process or is coated with a coating that facilitates ossification.
- The object of the invention is completely achieved in this way.
- Surprisingly it has been found that in this way a one-part dental implant having an anchoring part and a mounting part can be prepared that consists of a material based on zirconia and which still guarantees a good ossification during healing time.
- Herein a particular advantage must be seen in the one-part design of the implant that in combination with a high strength of zirconia ceramic guarantees a high stability of the total system. Simultaneously there is the particular advantage that the mounting part can be approximated to the natural tooth color and thus in particular in the visible region allows the preparation of completely natural looking ceramic reconstructions. In addition, the mounting part can be directly ground which allows a simple and advantageous adaptation of the additional elements to be applied. Possibly additional abutments may become superfluous.
- Although from DE 40 12 731 A1 basically several processes for the treatment of implants are known which generate a defined coarse surface, the invention is not rendered obvious thereby, since this publication merely relates to the treatment of metallic implants and in addition does not give any indication which would stimulate the person skilled in the art to design a one-part implant based on zirconia.
- In addition, from DE 28 38 759 A1 it is basically known to provide an implant consisting of metal, plastic or ceramic with a layer system consisting of a passivating layer and/or of several physiologically active layers. Herein in particular a passivating layer of silicon nitride and a physiologically active layer of calcium fluoride, of α-alanin, of carbon or the like is contemplated.
- However, also this does not render the invention obvious, since this document merely relates in general to possible coatings of implants and does not provide the person skilled in the art with any suggestions to design a one-part implant based on zirconia.
- Preferably, the implant according to the invention is applied transgingivally. Thus the soft tissue attachment developing the biological breadth is not disturbed by a secondary operation such as occurring with systems that heal with covered mucous linings.
- According to the invention after the implantation a primary treatment by applying a temporary measure directly onto the mounting part is made possible. To this end after reaching a sufficient primary stability, e.g. by screwing the anchoring part into a bone bore, only measures must be taken to avoid in particular sharing motions during the subsequent healing time. In case of several implants this can be effected by a blocking, while with single implants this can be effected by an attachment to adjacent teeth or to prosthetic parts partially by applying adhesive.
- Preferably the anchoring part comprises a threaded section.
- Thereby the implant according to the invention can be implanted with the necessary primary stability so that subsequently to the implantation directly a primary treatment is made possible by applying a temporary measure.
- According to a further embodiment of the invention the anchoring part at its outer surface is at least partially roughened by a removing process or is micro-structured.
- Such a surface structuring guarantees that the zirconium oxide material which would otherwise be bio-inert can reach an integral osteogenesis with the bone material.
- For reaching a good integral osteogenesis it is preferred in this regard, when the dental implant in the region of the anchoring part has a maximum surface roughness between 1 and 20 μm, preferably between 2 and 15 μm, in particular between 4 and 12 μm, particularly preferred between 6 and 12 μm.
- Basically to this end an abrasive blasting, such as sand blasting (using corundum), a blasting with boron carbide particles, or a high-pressure water blasting, is possible. However, problematic with such a treatment is the high hardness of the zirconium oxide ceramic. Therefore, a considerably improved surface roughness can be reached by using a hard material for blasting, such as boron carbide particles which is considerably costly, however.
- Therefore, alternatively also chemical processes, such as etching processes, are contemplated which partially may be applied as a subsequent treatment in addition to a previous mechanical treatment.
- Apart from that also for such removing processes laser-based processes are contemplated.
- In particular preferred is to perform an initial blasting treatment, such as sand blasting with Al2O3, and a subsequent etching treatment using phosphoric acid, sulphuric acid, hydrochloric acid or mixtures thereof.
- Ferein the blasting treatment may be performed using a pressure between about 1 bar and 10 bars, preferably between 2 and 6 bars, in particular between 3 and 5 bars.
- Herein in particular, as a subsequent treatment after a blasting treatment, an etching treatment is desired using phosphoric acid of 10 to 90 vol.-%, preferably of 15 to 50 vol.-%, in particular of 20 to 40 vol.-%.
- The etching may e.g. be performed for a time of 10 seconds to 10 minutes, preferably between 10 and 120 seconds, in particular between about 15 to 60 seconds.
- The etching treatment suitably is followed by a cleaning step, such as rinsing within a NaCl solution and subsequent rinsing in deionized water.
- Using such dental implants that are pretreated in particular in the region of the anchoring part a safe integral osteogenesis can be reached.
- According to a further embodiment of the invention the anchoring part at its outer surface is at least partially provided with a bio-active coating.
- This may for instance be a silanizing or a hydroxylation which also facilitates osteogenesis,
- According to a further embodiment of the invention the anchoring part is at least partially coated with a metallic or ceramic coating or with a cermet coating.
- Also in this way a particular surface structuring can be provided which facilitates an integral osteogenesis.
- Herein the anchoring part may e.g. be coated by thermal spraying, by CVD or by PVD.
- Herein, in particular, a coating consisting of titanium or of a titanium alloy is regarded as advantageous, which possibly may be applied by thermal spraying.
- With such a coating the bio-compatibility of titanium having been known since years, can be utilized for reaching a safe integral osteogenesis of the anchoring part during the healing phase. The titanium possibly applied by thermal spraying has a sufficient micro-structuring to avoid a distant osteogenesis and to guarantee a safe ossification.
- Preferably, herein only the region within the anchoring part is coated that will be recessed within the bone during implantation. Thereby the advantageous aesthetics of the zirconia-based ceramic in the region of the mounting part can be combined with the advantageous bio-compatibility of titanium.
- Suitably the mounting part comprises a support for applying a screwing tool.
- Herein the mounting part may be designed for positive fitting of a screwing tool, such as basically already known in the art.
- Basically, the dental implant can be designed with all kinds of implant shapes already known or to be developed.
- Herein the mounting part may be configured as an extension of the anchoring part or may be offset with respect to the anchoring part.
- Also the mounting part may have a frusto-conical basic shape, this facilitating an adhesive attachment of abutments for prosthesis constructions.
- Naturally, in addition also further shapes of the mounting part are possible, such as a square shape or hexagonal shape.
- According to a further embodiment of the invention the dental implant is stored in a suitable liquid, such as deionized water, after a previous activation of its surface, such as by silanizing or hydroxylation or by an etching treatment, before it is implanted by the doctor. Thus the dental implant may be stored within a container, preferably without air access.
- Thereby it is avoided that the surface of the dental implant before mounting loses its activation fully or partially due to air constituents. In this way an ossification is facilitated.
- The preparation of a zirconia ceramic for the one-part dental implant is basically known in the art and is not regarded as being part of the invention. In this regard it is referred e.g. to U.S. Pat. No. 6,165,925 mentioned at the outset, which is fully incorporated by reference into this application. A zirconia ceramic prepared in this way may for instance be processed by grinding to the desired shape of the dental implant and may be subsequently surface-treated to reach the desired surface characteristics.
- It will be understood that the above-mentioned and following features of the invention are not limited to the given combinations, but are applicable in other combinations or taken alone without departing from the scope of the invention.
- Further features and advantages of the invention will become apparent from the following description of preferred embodiments taken in conjunction with the drawings. In the drawings show:
-
FIG. 1 a side view of a first embodiment of an implant according to the invention; -
FIG. 2 a side view of an embodiment of an implant according to the invention slightly modified with respect to the embodiment ofFIG. 1 ; -
FIG. 3 a side view of a further embodiment of an implant according to the invention wherein the mounting part is slightly offset with respect to the anchoring part; -
FIG. 4 a REM photograph of a test specimen of an implant which has been implanted into a patient and which has been removed together with the adjacent bone material using a drill after a healing period of about 3 months. - In
FIGS. 1-3 several possible embodiments of a one-part dental implant according to the invention are depicted, this being purely exemplary without limiting the scope of the invention to any kind of shape of the implant. - In
FIG. 1 a dental implant according to the invention is designated in total withnumeral 10. It comprises an anchoringpart 12 having a threadedsection 14 and a rounded lower end. The anchoringpart 12 at its upper end transitions via a slightly enlargedconical section 16 to the outside into a mountingpart 18 being integral therewith and extending within an extension of thelongitudinal axis 24 of the threadedsection 14. The mountingpart 18 has a frusto-conical or a conical shape and is provided with a flattening 20 at one side thereof. At the side opposite the flattening 20 there is provided agroove 22 within the outer surface that extends from the upper front surface of the mountingpart 18 toward the lower side and ends in a conical section which forms the transition to theconical section 16 of the anchoringpart 12. - The flattening 20 in combination with the
groove 22 located on the opposite side functions to provide a positive attachment of a screwing tool which has a plug-in seat matched thereto. -
FIG. 2 shows a slightly modified embodiment of a dental implant designated in total withnumeral 30 which again comprises an anchoringpart 32 having a threadedsection 34 being followed by aconical mounting part 38 on which thegroove 42 can be seen, since thedental implant 30 is depicted rotated by 90° with respect to thedental implant 10 ofFIG. 1 . - By contrast to the embodiment shown in
FIG. 1 thedental implant 30 does not have a conical section within the transitional region between the anchoringpart 32 and the mountingpart 38. Instead, the mountingpart 38 is configured as a conical section directly adjoining the anchoringpart 32 which is shaped cylindrically. Again on the side opposite to the groove 42 a respective flattening may be provided, such as can be seen inFIG. 1 . - In
FIG. 3 a modified embodiment of the dental implant is designated in total withnumeral 50. - The
dental implant 50 comprises an anchoringpart 52 corresponding to the embodiment according toFIG. 1 and having a threadedsection 54 which transitions via an outerconical section 56 into a mountingpart 58. - Again the mounting
part 58 has a conical basic shape, however, is offset with respect to the longitudinal axis of the anchoringpart 52, e.g. by an angle of about 15°, this being particularly suitable for applications within the incisor region in many cases. Again, by asuitable recess 60 at the outer surface of the mounting part 58 a positive engagement of a screwing tool is made possible to also allow to screw into a bone bore this dental implant having an offset mounting part. - The anchoring part may e.g. have an axial length of 10 mm, wherein the other dimensions result in a corresponding manner. However, it should be understood that the dimensions and the shane may be modified in a suitable way, depending on the respective indication.
- The
dental implants - The anchoring part at its outer surface thereof has been treated by a suitable removing pretreatment or by a suitable coating to thereby reach a good integral osteogenesis after implantation. E.g. the anchoring part may be silanated or hydroxylated or may be roughened by a removing process or may be micro-structured.
- Also using a coating which is preferably applied by thermal spraying with a layer thickness preferably being in the range between about 20 and 100 μm, an integral osteogenesis can be reached.
- Apart from ceramic coatings e.g. consisting of zirconia, alumina, silica or mixtures thereof with possible further constituents, in particular a coating by thermal spraying is preferred consisting of pure titanium having a layer thickness of about 20 to 100 μm.
- It is suggested to perform a suitable pre-treatment of the surface before the spraying the coating possibly by plasma spraying, to guarantee a sufficient roughness for a good adhesion of the coating, e.g. using abrasive blasting or an etching treatment.
- Using a thin, thermally sprayed coating, in particular consisting of titanium applied only in the region of the anchoring part (not in the visible region), a safe integral osteogenesis can be reached during healing time, wherein simultaneously the advantages of zirconia ceramic, such as grinding possibility and a color approximated to the natural tooth can be utilized.
- By means of first field tests it has been shown that a one-part zirconia implant, the outer surface of which has merely been subjected to a subtractive treatment, can guarantee an integrating osteogenesis.
- To this end, test implant samples according to
FIG. 4 were prepared from a zirconia ceramic according to U.S. Pat. No. 6,165,925 and were processed by grinding to yield the shape according toFIG. 4 . - Thereafter, the surface was sand blasted with corundum using a blasting pressure of 4 bars. This yielded a maximum surface roughness of 6.4 μm with an average surface roughness of about 4.7 μm. The
test implant sample 70 shown inFIG. 4 was implanted into a patient. After a healing time of about 3 months the test implant sample was removed together with a small amount of the surrounding bone material using a hollow drill and was analyzed histologically with respect to osteointegration. It was found that an integrating osteogenesis can be reached. - Additional improvements with respect to an integrating osteogenesis already after short healing time are particularly expected when using increased surface roughnesses in the range of about 5 to 15 μm Rmax to which end in particular a subsequent treatment of the blasted surface by etching with phosphoric acid is contemplated. In particular, by etching with phosphoric acid of 30% for a time of 30 seconds, using a subsequent rinsing initially with NaCl solution and thereafter with deionized water, the surface roughness can be increased to 5 to 15 μm Rmax (in particular to about 8 to 12 μm, depending on the previous blasting treatment).
- In addition, the activation of the surface reached by etching facilitates an osteointegration. To keep this activation until implantation, in addition it is preferred to store the implant directly after the etching and rinsing treatment in a suitable liquid, such as deionized water, until the implant is implanted by the doctor. In this way it is avoided that the surface loses its activation fully or partially by means of air constituents, before the dental implant is applied.
Claims (23)
Priority Applications (3)
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US12/407,262 US20090176191A1 (en) | 2001-11-30 | 2009-03-19 | Ceramic dental implant |
US13/228,642 US10271927B2 (en) | 2001-11-30 | 2011-09-09 | Ceramic dental implant |
US14/978,781 US20160106524A1 (en) | 2001-11-30 | 2015-12-22 | Ceramic dental implant |
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DE10159683A DE10159683A1 (en) | 2001-11-30 | 2001-11-30 | Dantalimplantat |
DE10159683.9 | 2001-11-30 | ||
PCT/EP2002/013187 WO2003045268A1 (en) | 2001-11-30 | 2002-11-23 | Ceramic dental implant |
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PCT/EP2002/013187 A-371-Of-International WO2003045268A1 (en) | 2001-11-30 | 2002-11-23 | Ceramic dental implant |
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US13/228,642 Division US10271927B2 (en) | 2001-11-30 | 2011-09-09 | Ceramic dental implant |
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US13/228,642 Active 2024-05-18 US10271927B2 (en) | 2001-11-30 | 2011-09-09 | Ceramic dental implant |
US14/978,781 Abandoned US20160106524A1 (en) | 2001-11-30 | 2015-12-22 | Ceramic dental implant |
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US14/978,781 Abandoned US20160106524A1 (en) | 2001-11-30 | 2015-12-22 | Ceramic dental implant |
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EP (5) | EP1609436B1 (en) |
JP (5) | JP2006501867A (en) |
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AU (1) | AU2002356716A1 (en) |
DE (3) | DE10159683A1 (en) |
ES (4) | ES2661336T3 (en) |
WO (1) | WO2003045268A1 (en) |
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