CN116019583B - Composite base repair screw, bridge and mounting method thereof - Google Patents
Composite base repair screw, bridge and mounting method thereof Download PDFInfo
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- CN116019583B CN116019583B CN202310317584.4A CN202310317584A CN116019583B CN 116019583 B CN116019583 B CN 116019583B CN 202310317584 A CN202310317584 A CN 202310317584A CN 116019583 B CN116019583 B CN 116019583B
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- 230000008439 repair process Effects 0.000 title claims abstract description 126
- 239000002131 composite material Substances 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 76
- 239000004696 Poly ether ether ketone Substances 0.000 claims abstract description 56
- 229920002530 polyetherether ketone Polymers 0.000 claims abstract description 56
- 230000002093 peripheral effect Effects 0.000 claims abstract description 55
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000007943 implant Substances 0.000 claims abstract description 44
- 230000007704 transition Effects 0.000 claims description 24
- 230000006835 compression Effects 0.000 claims description 22
- 238000007906 compression Methods 0.000 claims description 22
- 230000013011 mating Effects 0.000 claims description 9
- 125000006850 spacer group Chemical group 0.000 claims description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
- 238000011161 development Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims 2
- 238000013461 design Methods 0.000 description 20
- 210000000988 bone and bone Anatomy 0.000 description 15
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 210000000214 mouth Anatomy 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 210000001519 tissue Anatomy 0.000 description 3
- 208000010392 Bone Fractures Diseases 0.000 description 2
- 206010017076 Fracture Diseases 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 206010061218 Inflammation Diseases 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 208000005358 Tooth Attrition Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004053 dental implant Substances 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
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- 229910052719 titanium Inorganic materials 0.000 description 1
- 210000000332 tooth crown Anatomy 0.000 description 1
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- Dental Prosthetics (AREA)
Abstract
The application relates to a composite abutment repair screw for fixing a bridge of PEEK material relative to an implant, which is designed to be suitable for embedding in the bridge with a screw head and for screwing directly or indirectly with a screw shaft to an implant fixed to a jaw via the abutment, wherein the screw shaft has an unthreaded section on the upper side and a threaded section on the lower side, the unthreaded section being dimensioned in length to span a thickness of the bridge material such that the radial pressure generated by the peripheral side of the unthreaded section against the contacted bridge material is within the tolerance of the PEEK material of the bridge, and the ratio of the screw head diameter to the screw shaft diameter is designed to be greater than in a standard screw such that the axial pressure generated by the axially projected area of the bottom side of the screw head projecting beyond the screw shaft against the contacted bridge material is within the tolerance of the PEEK material of the bridge. The application also relates to a corresponding bridge and a mounting method thereof.
Description
Technical Field
The application relates to a composite base repair screw, a bridge and a bridge mounting method.
Background
The implant is a method for repairing the missing teeth by embedding implant materials (implant) into the jaw bone and then making artificial crowns on the implant materials. Compared with movable false teeth, the implant has the advantages of comfortable use, firmness and stability, no injury to adjacent teeth, strong biting force, durability and the like. Common edentulous conditions in clinic include single edentulous, partial multiple edentulous and total mouth edentulous. In the case of partial multiple missing teeth and full mouth no teeth, the dental implant system also includes a bridge for carrying multiple artificial crowns.
Typically Maqiao is a way to repair a missing tooth in the mouth region of a toothless jaw. Firstly, a plurality of implants are planted on the dentognathic bones in the oral cavity, and then Maqiao is built on the fixed implants to form a stable bridge for connecting the artificial dental crowns. The difference between the artificial tooth and the whole removable half-mouth or full-mouth covered denture fixed on the implant by means of magnetic attraction, rod clamp, ball cap or falling buckle is that each artificial tooth crown which can be split automatically is connected on a bridge of Maqiao. Thus, the split maintenance of the single dental crown can be performed during the later maintenance.
For this purpose, the implant is generally designed in the shape of a screw having both internal and external threads, and the external threads are combined with the jaw bone after being tapped into the jaw bone, and a firm connection is formed after healing. The titanium base is screwed in the internal threaded hole of the implant, and the top is provided with a threaded hole for receiving a composite base repair screw screwed in through the bridge. This design allows the screw head of the composite abutment repair screw to directly contact in the form-fitting receiving hole in the bridge, both forming a metal-to-metal connection interface. According to the standard design of the composite abutment repair screw currently used in the art, the composite abutment repair screw is directly transited to the screw rod through a certain taper, and the unthreaded section on the screw rod is very short. Therefore, if the bridge contacted by the composite abutment repair screw is replaced with a PEEK material, the composite abutment repair screw may intrude into the PEEK material under the taper of the screw head, thereby breaking the mounting hole in the bridge in the axial direction, since the PEEK material is softer than the metal. In addition, since the composite abutment repair screw is hard and the PEEK material is soft, radial swinging of the composite abutment repair screw also penetrates the PEEK material to radially expand the mounting hole. This, therefore, results in the metal-PEEK connection interface failing to achieve strength and durability that meets regulatory medical standards.
Problems that can be encountered if the prior art metal bridge set screw is used directly are: the screw cap is smaller and the anchor length is shorter, so that the thicker bridge bottom hole cannot be fixed. The edge of the screw cap is provided with sharp edges, so that the cutting is easy to occur, and fatigue fracture is easy to occur at the cutting position. The screw is fixed with the bridge without connection, and the screw is easy to twist, so that the bridge is dislocated relative to the jawbone.
However, the development of the prior art has desired to manufacture the bridge from PEEK having a modulus of elasticity similar to that of human bone in order to bring a series of convenience and improvements in price and comfort. Accordingly, it would be desirable to provide a composite abutment repair screw and bridge that can achieve connection strength and durability with a bridge of PEEK material that meets regulatory medical standards.
Disclosure of Invention
To this end, according to a first aspect of the application, a composite abutment repair screw is provided for fixing a bridge of PEEK material relative to an implant, which is designed to be suitable for embedding in the bridge with a screw head and for screwing directly or indirectly with a screw shaft to an implant fixed to a jaw via the abutment, wherein the screw shaft has an upper thread-free section and a lower thread section, the length of the thread-free section being dimensioned to span a thickness of bridge material such that the radial compression of the contacted bridge material by the circumferential side of the thread-free section is within the tolerance of the PEEK material of the bridge, and the ratio of the screw head diameter to the screw shaft diameter is designed to be greater than in a standard screw such that the axial projection area of the bottom side of the screw head protruding beyond the screw shaft is within the tolerance of the material of the bridge for the contacted bridge.
It should be noted that when using the composite abutment repair screw according to the present application, the composite abutment repair screw may be screwed with an abutment fixed to the implant, or may be directly screwed to the implant. The threaded connection of the protruding bridge of the threaded section of the composite abutment repair screw is not limited to the abutment or the structural form without the abutment, but the structural form of directly threaded connection into the implant through the abutment is not limited to the structural form without the abutment, so that the abutment serving as a metal part is advantageously omitted, and the stability of soft and hard tissues around the implant is improved.
Compared with the traditional composite abutment repair screw, the composite abutment repair screw provided by the application has the advantages that the thread section extends out of the bridge frame to be connected with the abutment or the implant, and meanwhile, the unthreaded section which spans a certain thickness is reserved in the bridge frame. The unthreaded section has no sharp threads, as compared to the threaded section, but is in contact with the PEEK material of the bridge with a smooth peripheral surface, so that its dimensional parameters can be properly selected within the design space so that the PEEK is not subjected to intolerable radial pressure or stress concentrations. Similarly, the dimensional parameters of the axially projected area of the bottom side of the screw head can be appropriately selected within the design space so that the above-mentioned thickness of PEEK material left between the screw head and the abutment or implant can have a sufficiently large force area in the axial direction to absorb the axial pressure to which it is subjected. Therefore, although PEEK material of the bridge frame and the metal material of the composite base repair screw are in direct contact to form a PEEK-metal connection interface, the connection interface still can meet the strength and durability requirements of the specified medical standard due to the fact that a sufficient stress area is reserved in design, and long-term technical prejudice of the person skilled in the art in the aspect of metal-PEEK connection interface is overcome.
Preferably, the composite abutment repair screw is designed such that the bottom side of the screw head smoothly transitions to the unthreaded section of the screw shaft and the outer surface of the screw head smoothly transitions from the circumferential side to the bottom side. The smooth transition at two places eliminates stress concentration. In addition, this is not considered in prior art composite abutment repair screw designs because, as described above, the screw head transitions directly to the thread section with a taper, there is essentially no unthreaded section, nor is there an axially projected area of the bottom side of the screw head that protrudes significantly beyond the screw shank, and there is no transition between the so-called bottom side of the screw head and the screw shank.
According to a preferred embodiment of the composite abutment repair screw according to the application, the underside of the screw head is a flat surface protruding radially beyond the screw shank. In this case, the above-mentioned axial projection area of the bottom side of the screw head protruding beyond the screw shaft corresponds substantially to the planar surface of the bottom side of the screw head protruding beyond the screw shaft in the radial direction. The size of the composite base repair screw is properly selected to enable the stress of the screw in the axial direction to be dispersed to a large enough stress area, so that the composite base repair screw made of metal can be safely, firmly and durably connected with the bridge frame made of PEEK material. It should be understood that the flat surface of the bottom side of the screw head is not limited to protruding the screw shaft in the radial direction, but may have a suitable angle of inclination, for example, a declination angle of 5-15 degrees from the outside to the inside is also possible, and the dimensions of the flat surface may be appropriately selected to achieve a sufficiently large axial projection area as the bearing area, thereby meeting the connection strength requirement of the metal and the PEEK material.
Preferably, the peripheral side of the screw head is a cylindrical surface, a conical surface or a spherical cap surface. All three shapes can meet the requirement of providing enough stress area in the axial direction and the radial direction simultaneously.
According to another preferred embodiment of the composite abutment repair screw according to the application, the underside of the screw head is a spherical crown-shaped surface. The spherical cap surface may engage with a cylindrical surface, a conical surface or a spherical cap surface on the peripheral side of the screw head. In case the peripheral side of the screw head is a spherical-cap surface, the bottom side of the screw head may be a spherical-cap surface integrally transitioning to the peripheral side of the screw head. In this case, the peripheral side and the bottom side of the screw head are integrally formed as a spherical crown surface, so that a simplification of the process is achieved and the rounded transition between the peripheral side and the bottom side, which is to be provided in the structure, is omitted.
According to another preferred embodiment of the composite abutment repair screw according to the application, a separate annular spacer, for example of PEEK material, may also be provided for the underside of the screw head, in order to achieve protection of the bridge material by means of a spacer which can be replaced easily. The shape of the spacer may be designed to follow the shape of the bottom side of the screw head on its upper and lower sides and the bottom side of the corresponding screw head receiving hole. Thus, the top and bottom sides of the spacer are either flat or adapted to the bottom side of the screw head or screw head receiving hole of other curved shape. The peripheral side of the spacer may then be a cylindrical or conical surface adapted to the inner peripheral side of the screw head receiving hole. Both shapes are able to meet the design possibilities of providing a sufficiently large bearing surface in both axial and radial directions.
According to a further preferred embodiment of the composite abutment repair screw according to the application, the peripheral side of the screw head is provided with a fastening thread for engagement with a mating fastening thread provided on the inner peripheral wall of the screw head receiving hole in the bridge when the threaded section of the composite abutment repair screw is screwed onto the abutment or implant.
Conventionally, a locking compression bone plate that fits against a fractured bone and a screw driven generally normal thereto are used in fracture repair to fix the position of the fractured bone. The screw used in this bone-setting method also has threads on the peripheral side of the screw head, so that a fixed compression of the fractured bone is achieved during the screwing into the fractured bone. However, in technical principle, such screws, which are applied only in the field of bone surgery, do not give the person skilled in the art sufficient insight to use them in the field of dental restorations. The reason is that, first, the locking compression bone plate is positioned and oriented prior to the screws, which are then tapped into the preformed through holes of the locking compression bone plate and into the fractured bone to be secured, during which process no significant transverse stresses are placed between the individual tapped screws on the locking compression bone plate. Moreover, the metal-to-metal connection between the locking compression plate and the screw is less demanding than the metal-PEEK connection. In contrast, the composite abutment repair screw of the present application is attached to the PEEK bridge, and the process of implanting the implant, mounting the abutment, and then mounting the composite abutment repair screw to secure the bridge also results in the PEEK bridge being inevitably subjected to lateral stresses caused by the positioning of the composite abutment repair screw. Therefore, it is not possible to simply consider such a threaded screw with a threaded head for use with a locking compression bone plate without addressing the stress safety of the metal-PEEK interface.
In comparison with the prior art screws, it is only possible to provide the peripheral side of the screw head with fastening threads without damaging the bridge of PEEK material, provided that the screw shaft is provided with a sufficiently large contact area of the unthreaded section with the bottom side of the screw head as described above.
The fastening threads provided on the peripheral side of the screw head provide an additional compression effect. Preferably, the pitch of the fastening thread on the peripheral side of the screw head is smaller than the pitch of the thread section of the screw shaft. For example, the screw shaft diameter is designed to be M1.5-M2.0, the pitch of the corresponding thread segments is 0.4mm, and the pitch of the threads on the peripheral side of the screw head is designed to be less than 0.4mm. In this case, in the process of screwing the composite abutment repair screw onto the abutment or the implant, the composite abutment repair screw tightens and fixes the bridge further downward by the narrow-pitch screw thread in addition to the surface contact with the bottom side thereof.
According to a preferred embodiment of the composite abutment repair screw according to the application, the length of the unthreaded section is dimensioned to be at least two-thirds of the length of the threaded section. Two-thirds of the length of the thread segments used to achieve the strength of the connection structure is sufficient to provide a sufficiently large bearing area to protect the bridge of PEEK material from damage. In addition, in terms of axial stress of the composite abutment repair screw, the diameter of the screw head may also be designed to be at least twice the diameter of the unthreaded section. This design subjects the material of the bridge lower portion sandwiched between the top surface of the abutment and the bottom side of the screw head to a sufficiently low pressure.
According to a second aspect of the present application, there is provided a bridge having a plurality of artificial crowns fixed or formed on a top side thereof, the bridge being fixed to a jawbone by a screw connection between a composite abutment repair screw buried in the bridge and an implant or a screw connection between an abutment fixed to the implant, wherein the bridge is integrally made of PEEK material, and has a plurality of screw mounting holes respectively provided for each composite abutment repair screw, the screw mounting holes having screw head receiving holes and screw rod receiving holes having inner diameters respectively matched with screw heads and screw rods of the corresponding composite abutment repair screw from top to bottom. A screw head supporting surface for supporting the screw head bottom side of the corresponding composite abutment repair screw is formed at the bottom side of the screw head receiving hole in an axially projected area region between the inner diameters of the screw head receiving hole and the screw rod receiving hole. The screw rod receiving bore of the bridge has a length dimension corresponding to the length dimension of the unthreaded section of the screw rod such that the radial pressure exerted by the peripheral side of the screw rod on the contacted bridge material is within the tolerance of the PEEK material of the bridge. The ratio of the inner diameter of the screw head receiving hole to the inner diameter of the screw shaft receiving hole is designed to be larger than that in a standard screw, so that the axial compression generated by the bottom side of the screw head of the corresponding composite abutment repair screw on the screw head supporting surface of the screw mounting hole is within the allowable range of the PEEK material of the bridge.
It should be noted that in using the bridge according to the application, the composite abutment repair screw may be screwed between the abutment fixed to the implant or may be screwed directly to the implant. The threaded connection of the protruding bridge of the threaded section of the composite abutment repair screw is not limited to the abutment or the structural form without the abutment, but the structural form of directly threaded connection into the implant through the abutment is not limited to the structural form without the abutment, so that the abutment serving as a metal part is advantageously omitted, and the stability of soft and hard tissues around the implant is improved.
Unlike conventional bridges, the bridge according to the application adapts to the shape of a composite abutment repair screw having a length of unthreaded section. The screw rod is fixed on the bridge frame, and the screw rod is fixed on the bridge frame. The unthreaded section has no sharp threads as compared to the threaded section, but instead contacts the PEEK material of the screw shank receiving bore of the bridge with a smooth peripheral surface, so that the size parameters of the unthreaded section/screw shank receiving bore can be properly selected within the design space so that the PEEK is not subjected to intolerable radial pressure or stress concentrations. Similarly, the dimensional parameters of the axial projected area of the bottom side of the screw head/the screw head support surface can be appropriately selected within the design space so that the above-mentioned thickness of PEEK material left between the screw head and the abutment or implant can have a sufficiently large force area in the axial direction to absorb the axial pressure to which it is subjected. Therefore, although PEEK material of the bridge frame and the metal material of the composite base repair screw are in direct contact to form a PEEK-metal connection interface, the connection interface still can meet the strength and durability requirements of the specified medical standard due to the fact that a sufficient stress area is reserved in design, and long-term technical prejudice of the person skilled in the art in the aspect of metal-PEEK connection interface is overcome.
The PEEK material adopted by the bridge frame has the advantages that the upper repairing body does not contain metal, the interface can be directly connected to the implant without a base station, so that the biological safety is better, and the repairing body is light-weighted even if the occlusion space is very high. Because the bone-like elasticity of the PEEK material is shock-absorbing, the biting force can be borne by designing thickening, which stabilizes the soft and hard tissues around the implant. This design does not change due to occlusal wear compared to a metal bridge, thereby reducing the risk of inflammation around the implant.
Preferably, the bridge is designed such that the bottom side of the screw head receiving hole smoothly transitions into the screw shaft receiving hole, and the surface of the screw head receiving hole smoothly transitions from the circumferential side to the bottom side. The smooth transition at two places eliminates stress concentration. In addition, this is not considered in prior art bridge designs because prior composite abutment repair screws, as described above, have a screw head that transitions directly to a threaded section with a taper, there is essentially no unthreaded section, nor is there an axially projected area of the bottom side of the screw head that protrudes significantly beyond the screw shank, and there is no transition between so-called screw head receiving holes and screw shank receiving holes.
According to a preferred embodiment of the bridge according to the application, the bottom side of the screw head receiving hole is a flat surface protruding radially out of the screw shaft receiving hole. In this case, the above-mentioned axially projected area between the screw head receiving hole and the inner diameter of the screw shaft receiving hole corresponds substantially to the planar surface of the bottom side of the screw head receiving hole protruding radially beyond the screw shaft receiving hole. The size of the composite base repair screw is properly selected to enable the stress of the screw in the axial direction to be dispersed to a large enough stress area, so that the composite base repair screw made of metal can be safely, firmly and durably connected with the bridge frame made of PEEK material. It should be understood that the flat surface at the bottom side of the screw head receiving hole is not limited to protruding the screw shaft receiving hole in the radial direction, but may have a suitable inclination angle, for example, a declination angle of 5-15 degrees from the outside to the inside is also possible, and the size of the flat surface may be properly selected to achieve a sufficiently large axial projection area as the stress area under the inclination angle, so as to meet the requirement of the connection strength between the metal and the PEEK material.
Preferably, the peripheral side of the screw head receiving hole is a cylindrical surface or a conical surface. Both shapes can meet the requirement of providing a sufficiently large bearing area in the axial direction and in the radial direction at the same time.
According to another preferred embodiment of the bridge according to the application, the bottom side of the screw head receiving hole is a spherical crown surface. The spherical cap surface may engage with a cylindrical surface, a conical surface or a spherical cap surface on the peripheral side of the screw head receiving aperture.
According to a further preferred embodiment of the bridge according to the application, the inner peripheral wall of the screw head receiving hole is provided with mating fastening threads for engagement with fastening threads on the peripheral side of the screw head of the composite abutment repair screw.
Compared with the existing locking compression bone plate with the matched threaded holes, on the premise that the screw rod accommodating holes are matched with the sufficiently large unthreaded sections on the periphery and the bottom sides of screw heads are matched in the axial direction to realize a larger stressed area, the bridge frame with matched fastening threads on the inner periphery of the screw head accommodating holes is possible without damaging PEEK materials.
The fastening threads provided on the peripheral side of the screw head provide an additional compression effect. Preferably, the pitch of the mating fastening thread on the peripheral side of the screw head receiving hole is smaller than the pitch of the thread section of the screw shaft. For example, the screw shaft diameter is designed to be M1.5-M2.0, and the pitch of the corresponding thread section of the screw shaft is designed to be 0.4mm, and in this case, the pitch of the thread on the circumferential side of the screw head receiving hole is designed to be less than 0.4mm. In this case, in the process of screwing the composite abutment repair screw, the composite abutment repair screw further tightens and fixes the bridge downward by cooperation with the narrow-pitch screw thread on the inner peripheral wall of the screw head receiving hole in addition to the surface contact between the bottom side thereof and the screw head supporting surface of the screw head receiving hole.
According to a preferred embodiment of the bridge according to the application, the length of the screw rod receiving hole is dimensioned to be at least two-thirds the length of the threaded section of the composite abutment repair screw to receive the unthreaded section. Two-thirds of the length of the thread segments used to achieve the strength of the connection structure is sufficient to provide a sufficiently large bearing area to protect the bridge of PEEK material from damage. In addition, in terms of axial stress of the composite abutment repair screw, the inner diameter of the screw head receiving hole may also be designed to be at least twice the inner diameter of the screw shaft receiving hole. This design subjects the material of the bridge lower part clamped between the jaw and the underside of the screw head to a sufficiently low pressure.
According to an alternative embodiment of the bridge according to the application, in at least one screw mounting hole in the bridge, the screw head receiving hole and the screw shaft receiving hole each have a tapered surface shape narrowing towards the screw head supporting surface, so that a composite abutment repair screw can be mounted in the screw mounting hole with a certain adjustable angle range. The tapered surface shape narrowing toward the screw head support surface enables the composite abutment repair screw to achieve a degree of axial wobble in the screw head receiving bore and screw shaft receiving bore during installation and after seating. However, this modified design weakens the wall thickness at the corresponding location of the bridge, which may lead to local stresses which, in turn, necessitate a corresponding further increase in the axial and radial bearing surface area in the manner described above. It is therefore not preferable that all screw mounting holes of the bridge according to the application have such a design, while allowing the provision of such screw mounting holes to provide the convenience of adjustable screw angles.
According to a preferred embodiment of the bridge according to the application, the bridge material at least in the vicinity of the screw mounting holes contains a material component suitable for development under X-rays, preferably barium sulphate. This design enables the bridge to develop as desired under X-rays, while the bridge of PEEK material provides better biocompatibility, closer to the modulus of elasticity of human bone, than does the opaque metal material under X-rays, and additionally provides the advantage of being able to develop properties only in the necessary locations.
According to the present application, there is also provided a method for mounting the bridge frame as described above, characterized in that the bridge frame is fixed to the jawbone by the screw connection between the above-described composite abutment repair screw embedded in the bridge frame and the implant or the screw connection fixed between the implants, wherein the bottom side of the screw head receiving hole of the bridge frame supports the screw head bottom side of the corresponding composite abutment repair screw with an axially projected area region between the inner diameters of the screw head receiving hole and the screw shaft receiving hole, and the screw shaft receiving hole of the bridge frame supports the outer peripheral side of the unthreaded section of the screw shaft of the composite abutment repair screw with the inner peripheral side.
Drawings
Embodiments of the present application are explained below with reference to the drawings. In the drawings:
FIG. 1 schematically illustrates an installation position and an assembled cross-section of a composite abutment repair screw in a bridge according to the application;
FIG. 2 schematically illustrates a first embodiment of a composite abutment repair screw and bridge according to the application;
FIG. 3 schematically illustrates a second embodiment of a composite abutment repair screw and bridge according to the application;
FIG. 4 schematically illustrates a third embodiment of a composite abutment repair screw and bridge according to the application;
FIG. 5 schematically illustrates a fourth embodiment of a composite abutment repair screw and bridge according to the application;
fig. 6 shows bridge stress cloud and stress values in various embodiments of the application and in prior art manners of fixing a base repair screw to a bridge.
In the drawings, like reference numerals refer to like features.
Detailed Description
The present application will now be described in detail with reference to the accompanying drawings, which are only for the purpose of illustrating the application and are not to be construed as limiting the application. It should be understood that the features of the various embodiments described below may be combined with each other arbitrarily, unless otherwise specifically stated.
Fig. 1 schematically shows the mounting position and assembly section of a composite abutment repair screw according to the application in a bridge of PEEK material. The composite abutment repair screw is embedded in the bridge frame by a screw head and is in threaded connection with an implant fixed on the jawbone directly or indirectly through the abutment by a screw rod. The bridge is fixed on the jawbone through the threaded connection between the composite abutment repair screw embedded in the bridge and the implant.
The bridge is integrally made of PEEK material and is provided with a plurality of screw mounting holes which are respectively arranged for repairing screws of each composite base, and the number of the screw mounting holes is six in the figure. The screw mounting hole is internally provided with a screw head accommodating hole and a screw rod accommodating hole with inner diameters respectively matched with the screw head and the screw rod of the corresponding composite abutment repair screw from top to bottom, wherein a screw head supporting surface for supporting the bottom side of the screw head of the corresponding composite abutment repair screw is formed in the axial projection area between the inner diameters of the screw head accommodating hole and the screw rod accommodating hole at the bottom side of the screw head accommodating hole.
In fig. 1, the top of the abutment is only schematically shown in a cross-sectional detailed view. The composite abutment repair screw consists of an upper screw head and a lower screw rod. The screw shank has an unthreaded section on the upper side and a threaded section on the lower side, the unthreaded section having a length sized to fit across a thickness of bridge material such that radial compression of the contacted bridge material by the peripheral side of the unthreaded section is within the tolerance of the PEEK material of the bridge. The unthreaded section of the composite abutment repair screw according to the application forms a large area on its circumferential side that is subjected to radial pressure, compared to screws lacking an unthreaded section in the prior art. Also, in the axial direction of the composite abutment repair screw, the ratio of the diameter of the screw head to the diameter of the screw shank is designed to be greater than in a standard screw, so that the axial compression force generated by the axially projected area of the bottom side of the screw head protruding beyond the screw shank on the contacted bridge material is within the allowable range of the PEEK material of the bridge, the bottom side of the composite abutment repair screw forms a larger area that is subjected to axial compression force.
The screw rod receiving bore of the bridge has a length dimension corresponding to the length dimension of the unthreaded section of the screw rod such that radial compression of the contacting bridge material by the peripheral side of the screw rod is within the tolerance of the PEEK material of the bridge. Moreover, the ratio of the inner diameter of the screw head receiving hole to the inner diameter of the screw shaft receiving hole is designed to be larger than that in a standard screw, so that the axial compression force generated by the bottom side of the screw head of the corresponding composite abutment repair screw to the screw head supporting surface of the screw mounting hole is within the allowable range of the PEEK material of the bridge frame.
Compared with the screw lacking the unthreaded section in the prior art, the unthreaded section of the composite abutment repair screw mounted on the bridge frame provided by the application has a larger area which bears radial pressure on the peripheral side and a larger area which bears axial pressure on the bottom side. The bottom side of the screw head receiving hole and the peripheral side of the screw rod receiving hole on the bridge form correspondingly large matched bearing areas, so that the axial and radial pressure applied to the bridge material is kept within the tolerance range of the PEEK material of the bridge.
The installation locations of six composite abutment repair screws are shown only schematically on the bridge in fig. 1. These composite abutment repair screws may be identical to each other or may have the following embodiments that are different from each other. The bridge frame corresponds to the installation position of the composite abutment repair screws, namely, the respective screw head receiving holes and screw rod receiving holes can be identical to each other or can have the following implementation forms which are different from each other.
Example 1.
Fig. 2 schematically shows a first embodiment of a composite abutment repair screw and bridge according to the application. The underside of the screw head is a flat surface protruding radially beyond the screw shank. Accordingly, the bottom side of the screw head receiving bore is a planar surface that protrudes radially beyond the screw shank receiving bore. The screw head receiving hole is in the shape of a straight cylindrical hole. The peripheral side of the screw head is a conical flat surface that slopes slightly outwardly from top to bottom. Moreover, the circumferential side of the screw head of this shape does not press the lateral bridge in the radial direction, but is mainly pressed by the flat unthreaded section of the screw shaft. The outer surface of the screw head transitions smoothly from the peripheral side to the bottom side, while the bottom side of the screw head transitions smoothly to the unthreaded section of the screw shaft. Correspondingly, the bridge is mainly subjected to compression by the flat unthreaded section of the screw rod receiving bore. The surface of the screw head receiving hole smoothly transitions from the peripheral side to the bottom side, and the bottom side of the screw head receiving hole smoothly transitions to the screw shaft receiving hole. The rounded transition eliminates stress concentrations.
It will be appreciated that it is equally possible to design the peripheral side of the screw head as a cylindrical platform surface or a conical flat surface which is inclined slightly inwardly from top to bottom, and correspondingly also the peripheral side of the screw head receiving aperture as a conical flat surface which is inclined slightly inwardly from top to bottom. The peripheral side of the screw head, whether it be a cylindrical surface or a conical flat surface slightly inclined inwardly from top to bottom, can be easily fitted into such a screw head receiving hole.
Example 2.
Fig. 3 schematically shows a second embodiment of a composite abutment repair screw and bridge according to the application. The difference from the first embodiment is that both the peripheral side and the bottom side of the screw head of the composite abutment repair screw are spherical crown-like in shape and smoothly transition with each other. Of course, the underside of the screw head likewise transitions smoothly into the unthreaded section of the screw shaft. Correspondingly, the peripheral side and the bottom side of the screw head receiving hole of the bridge smoothly transition with each other. Of course, the bottom side of the screw head receiving bore likewise transitions smoothly into the screw shaft receiving bore.
Example 3.
Fig. 4 schematically shows a third embodiment of a composite abutment repair screw and bridge according to the application. The difference with the first embodiment is that an annular gasket made of the same material as the bridge is arranged between the bottom side of the screw head of the composite base repair screw and the supporting area of the bottom side of the bridge supporting screw head, so that a contact interface made of the same material is formed, the notch effect of the bridge is eliminated, the gasket is extruded and deformed by the composite base repair screw, and the fatigue performance of the bridge is improved. The annular shim should be placed into the screw head receiving hole of the bridge prior to installing the composite abutment repair screw into the bridge. The protection of the contact position between the bottom side of the screw head of the composite abutment repair screw and the bridge frame is realized through the annular gasket, and the processing requirement on the bottom side of the screw head of the composite abutment repair screw is reduced.
It should be understood that the annular shim here may have any shape that mates with the underside of the screw head of the composite abutment repair screw, i.e. with the underside of the screw head receiving hole of the bridge, and therefore the underside of the screw head of the composite abutment repair screw is not limited to the flat shape illustrated in this embodiment, but may also be designed as a spherical crown surface as shown in the second embodiment. In a variant embodiment, the bottom side of the screw head of the composite abutment repair screw is designed as a spherical crown surface, the bottom side of the screw head receiving hole of the bridge is designed as a flat shape, and can also be connected by an annular gasket which is correspondingly designed in shape. Or, the bottom side of the screw head of the composite abutment repair screw is designed to be flat, the bottom side of the screw head accommodating hole of the bridge is designed to be a spherical crown surface, and even the bottom side of the screw head of the composite abutment repair screw and the bottom side of the screw head accommodating hole of the bridge are respectively designed to be spherical crown surfaces with different curvatures, the composite abutment repair screw and the bridge can be connected through annular gaskets with corresponding shapes and matching designs.
Example 4.
Fig. 5 schematically shows a fourth embodiment of a composite abutment repair screw according to the application. In fig. 5, the screw head of the composite abutment repair screw is arranged with fastening threads on the circumferential side. The inner peripheral wall of the screw head accommodating hole in the bridge is provided with mating fastening threads meshed with the fastening threads. The axial projection area of the screw head protruding from the screw shaft on the bottom side as a whole, that is, the axial projection area of the screw head receiving hole of the bridge protruding from the screw shaft receiving hole on the bottom side is enough to bring the axial pressure generated on the contacted bridge material into the allowable range of the PEEK material of the bridge. When the composite abutment repair screw is screwed on the abutment or the implant in a threaded section, the fastening threads on the peripheral side of the screw head of the composite abutment repair screw are engaged with mating fastening threads provided on the inner peripheral wall of the screw head receiving hole in the bridge. Because the pitch of the fastening thread is set to be smaller than the pitch of the thread section of the screw rod, the composite abutment repair screw is enabled to downwards tension and press the bridge frame material to the implant in the screwing process, and therefore the fastening effect is achieved.
It should be understood that as a variant, it is likewise possible to design the screw head with threads on the circumference not in the form of a cone as shown in fig. 5, but in the form of a straight cylinder (not shown). At this time, the fastening thread on the peripheral side of the screw head of the composite abutment repair screw can have the same fastening effect.
To verify the mechanical properties of the bridge, the inventors of the present application analyzed the stress situation of the bridge when simulating the occlusion of the oral cavity, the bridge according to the present application was fixedly connected to two bases on the fixed base by the composite base repair screw according to the present application, and exerted downward pressure, and analyzed the effect on the bridge by the different composite base repair screws and bridge fixing means corresponding to the above-described embodiments 1 to 4 under the same load. The obtained maximum Mises stress values are 7.463, 7.279, 7.232 and 7.341, which are all smaller than the stress value 8.020 of the prior art in the fixing manner of the abutment repair screw and the bridge, as shown in fig. 6. Therefore, the bridge fracture risk can be reduced in all 4 embodiments, the service life of the implant is prolonged, and the risk of secondary operation is further reduced.
The foregoing describes preferred embodiments of the application, but the spirit and scope of the application is not limited to the specific disclosure herein. Those skilled in the art can make any combination and extension of the above embodiments according to the teachings of the present application to make further embodiments and applications within the spirit and scope of the present application. The spirit and scope of the present application are not limited by the specific embodiments, but by the appended claims.
Reference numerals
10. Composite abutment repair screw
20. Bridge rack
40. Screw head
50. Screw rod
51. Unthreaded section
52. Thread segment
70. Annular gasket
21. Screw head receiving hole
22. Mating fastening threads
Claims (22)
1. A composite abutment repair screw for fixing a bridge made of PEEK material integrally with respect to an implant, said composite abutment repair screw being designed to be adapted to be embedded in said bridge with a screw head and to be screwed with a screw shaft directly or indirectly via an abutment with an implant fixed to a jaw,
it is characterized in that the method comprises the steps of,
the screw shank has an upper thread-free section and a lower thread section, the length of the thread-free section being dimensioned to span a thickness of the bridge material such that the radial compression of the contacting bridge material by the peripheral side of the thread-free section is within the tolerance of the PEEK material of the bridge,
and the ratio of the screw head diameter to the screw shaft diameter is designed to be greater than in standard screws so that the axial compression of the bridge material contacted by the axially projected area of the underside of the screw head protruding beyond the screw shaft is within the tolerance of the PEEK material of the bridge.
2. The composite abutment repair screw according to claim 1, wherein the bottom side of the screw head smoothly transitions to the unthreaded section of the screw shank and the outer surface of the screw head smoothly transitions from the circumferential side to the bottom side.
3. The composite abutment repair screw according to claim 2, wherein the underside of the screw head is a flat surface radially protruding from the screw shank.
4. A composite abutment repair screw according to claim 3, wherein the peripheral side of the screw head is a cylindrical surface, a conical surface or a spherical cap surface.
5. The composite abutment repair screw according to claim 4, wherein the underside of the screw head is a spherical crown shaped surface.
6. The composite abutment repair screw according to claim 1, wherein the underside of the screw head is designed to be adapted to be supported on the PEEK material of the bridge by an annular spacer.
7. The composite abutment repair screw as claimed in any one of claims 4 to 6, wherein a peripheral side of the screw head is provided with a fastening thread for engaging with a mating fastening thread provided on an inner peripheral wall of a screw head receiving hole in the bridge when a threaded section of the composite abutment repair screw is screwed onto the abutment or implant.
8. The composite abutment repair screw according to claim 7, wherein the pitch of the fastening thread on the peripheral side of the screw head is smaller than the pitch of the thread section of the screw shaft.
9. The composite abutment repair screw of any one of claims 4-6, wherein the length dimension of the unthreaded section is at least two-thirds of the length of the threaded section.
10. The composite abutment repair screw of any one of claims 4-6, wherein the diameter of the screw head is at least twice the diameter of the unthreaded section.
11. A bridge fixed to a jaw by a threaded connection between a composite abutment repair screw as claimed in any one of claims 1 to 10 and an implant or abutment embedded in the bridge,
it is characterized in that the method comprises the steps of,
the bridge frame is provided with a plurality of screw mounting holes respectively arranged for each composite abutment repair screw, screw head accommodating holes and screw rod accommodating holes with inner diameters respectively matched with the screw heads and the screw rods of the corresponding composite abutment repair screws are arranged in the screw mounting holes from top to bottom,
wherein a screw head supporting surface for supporting the screw head bottom side of the corresponding composite abutment repair screw is formed at the bottom side of the screw head receiving hole in an axially projected area region between the inner diameters of the screw head receiving hole and the screw rod receiving hole so that an axial compression force generated by the screw head bottom side of the corresponding composite abutment repair screw to the screw head supporting surface of the screw mounting hole is within an allowable range of PEEK material of the bridge frame,
wherein the screw rod receiving hole of the bridge has a length dimension corresponding to a length dimension of the unthreaded section of the screw rod of the composite abutment repair screw such that radial compression of the peripheral side of the screw rod against the contacted bridge material is within an allowable range of the PEEK material of the bridge.
12. The bridge of claim 11, wherein the bottom side of the screw head receiving hole smoothly transitions to the screw shaft receiving hole and the surface of the screw head receiving hole smoothly transitions from the peripheral side to the bottom side.
13. The bridge of claim 12, wherein the bottom side of the screw head receiving aperture is a planar surface radially protruding from the screw shaft receiving aperture.
14. The bridge of claim 13, wherein the peripheral side of the screw head receiving aperture is a cylindrical surface or a conical surface.
15. The bridge of claim 14, wherein the bottom side of the screw head receiving aperture is a bulbous surface integrally transitioning to the peripheral side of the screw head receiving aperture.
16. Bridge according to claim 14 or 15, wherein the inner peripheral wall of the screw head receiving hole is provided with mating fastening threads for engagement with fastening threads on the peripheral side of the screw head of the composite abutment repair screw.
17. The bridge of claim 16, wherein the pitch of the mating fastening threads is less than the pitch of the threaded section of the screw shaft.
18. The bridge of claim 14 or 15, wherein the screw rod receiving bore has a length dimension that is at least two-thirds of a length of a threaded section of the composite abutment repair screw to receive the unthreaded section.
19. Bridge according to claim 14 or 15, wherein the inner diameter of the screw head receiving hole is at least twice the inner diameter of the screw shaft receiving hole.
20. Bridge according to claim 14 or 15, wherein in at least one screw mounting hole in the bridge, the screw head receiving hole and the screw shaft receiving hole each have a tapered shape narrowing towards the screw head supporting surface to enable a composite abutment repair screw to be mounted in the screw mounting hole at a range of adjustable angles.
21. Bridge according to claim 14 or 15, characterized in that the bridge material at least in the vicinity of the screw mounting holes comprises a material composition suitable for development under X-rays.
22. The bridge of claim 21, wherein the material composition suitable for development under X-rays is barium sulfate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310317584.4A CN116019583B (en) | 2023-03-29 | 2023-03-29 | Composite base repair screw, bridge and mounting method thereof |
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| CN202310317584.4A CN116019583B (en) | 2023-03-29 | 2023-03-29 | Composite base repair screw, bridge and mounting method thereof |
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| CN116019583A CN116019583A (en) | 2023-04-28 |
| CN116019583B true CN116019583B (en) | 2023-11-24 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000093435A (en) * | 1998-09-18 | 2000-04-04 | Yoshida Dental Mfg Co Ltd | Implant |
| CN202843834U (en) * | 2012-10-12 | 2013-04-03 | 无锡锐利医疗器械有限公司 | Split type dental implant |
| WO2017186834A1 (en) * | 2016-04-28 | 2017-11-02 | Kulzer Gmbh | Flexible dental basic structure for securing dental prosthetic fixtures to implants |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016102009A1 (en) * | 2016-02-04 | 2017-08-10 | Holger Zipprich | Abutment, in particular for use with a dental implant inserted into the jawbone of a patient, and method of making the abutment |
| EP3320877B1 (en) * | 2016-11-14 | 2021-05-26 | Andreas Schwitalla | Implant made from fibre-reinforced plastic |
-
2023
- 2023-03-29 CN CN202310317584.4A patent/CN116019583B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000093435A (en) * | 1998-09-18 | 2000-04-04 | Yoshida Dental Mfg Co Ltd | Implant |
| CN202843834U (en) * | 2012-10-12 | 2013-04-03 | 无锡锐利医疗器械有限公司 | Split type dental implant |
| WO2017186834A1 (en) * | 2016-04-28 | 2017-11-02 | Kulzer Gmbh | Flexible dental basic structure for securing dental prosthetic fixtures to implants |
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| CN116019583A (en) | 2023-04-28 |
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