CN113476162A - Dental implant with porous structure and preparation method thereof - Google Patents
Dental implant with porous structure and preparation method thereof Download PDFInfo
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- CN113476162A CN113476162A CN202110920520.4A CN202110920520A CN113476162A CN 113476162 A CN113476162 A CN 113476162A CN 202110920520 A CN202110920520 A CN 202110920520A CN 113476162 A CN113476162 A CN 113476162A
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Images
Classifications
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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
- A61C8/0018—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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/38—Process control to achieve specific product aspects, e.g. surface smoothness, density, porosity or hollow structures
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- B22F10/62—Treatment of workpieces or articles after build-up by chemical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/66—Treatment of workpieces or articles after build-up by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The invention provides a preparation method of a dental implant with a porous structure, which comprises the following steps: step S1: three-dimensionally modeling the dental implant with the porous structure, and storing data of the three-dimensional model; step S2: converting the three-dimensional model data in the step S1 into a file format for slicing software processing, the slicing software slicing the acquired three-dimensional model data; step S3: inputting the data processed by the slicing software in the step S2 into a rapid prototyping system for controlling a laser beam scanning path to obtain two-dimensional information data of each layer of slices, and performing rapid prototyping to obtain the dental implant with the porous structure; step S4: and (4) performing optimization treatment on the porous dental implant obtained in the step (S3). A dental implant with a porous structure comprises an implant with a porous structure, wherein the main body of the implant is made of a titanium alloy material, and the titanium alloy comprises the following chemical components in percentage by weight: 0.12-0.20% of O, 0.002-0.015% of H, 0.018-0.05% of N, 0.016-0.10% of C, 0.17-0.30% of Fe, 3.5-4.50% of V, 5.50-6.80% of Al and the balance of Ti.
Description
Technical Field
The invention relates to the technical field of dental implants, in particular to a dental implant with a porous structure and a preparation method thereof.
Background
Along with the loss of teeth caused by the increase of age, accidents in life or living habits, the teeth are generally implanted into the lost teeth along with the development of the society, so that the life quality is improved, and the facial beauty problem caused by the loss of the teeth is avoided.
There are three conventional repair methods:
1. the movable bridge: the hook (snap ring) is hung on the natural teeth on the two sides. Has slight foreign body sensation, is troublesome, needs to be repeatedly taken and worn, and has low price. 2. Fixing the bridge: two teeth (abutment teeth) need to be ground and changed, the teeth on the two sides are used as crowns and connected together like a bridge, and the middle bridge body is made into a missing tooth shape. Its advantages are no foreign body sensation, no need of wearing it, and low cost (2-3-7-8 thousand); but the biggest defect is that adjacent teeth on two sides are damaged, even pulp necrosis, secondary caries and the like of the adjacent teeth are caused, the success rate is low in the long term, and the method is not generally recommended. 3. Implanting a tooth: a tooth root (implant) of pure titanium with special surface treatment is implanted in an alveolar bone of a tooth-lacking area, after 2-3 months, osseointegration is formed between the implant and the alveolar bone, and a crown is made on the tooth root. The method has the advantages of comfort, no foreign body sensation, no need of wearing and taking, and no need of destroying natural teeth on two sides.
Because the implant has the advantages of comfort, no foreign body sensation, no need of taking off and wearing, and no need of destroying natural teeth on two sides, the implant is popular with people, and the preferred metal material of the implant material in the prior art is mainly titanium and alloy thereof, or titanium alloy is taken as a base material, and various bioactive coatings are coated on the surface of the titanium or titanium alloy. However, the existing process for manufacturing the dental implant needs to be cut by a machine tool, and cannot meet the requirements for producing various and precise dental implants.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a dental implant which not only can meet the requirements of manufacturing various dental implants, but also can accurately produce the required dental implant.
The technical scheme of the invention is as follows:
a preparation method of a dental implant with a porous structure comprises the following steps:
step S1: three-dimensionally modeling the dental implant with the porous structure, and storing data of the three-dimensional model;
step S2: converting the three-dimensional model data in the step S1 into a file format for slicing software processing, wherein the slicing software slices the acquired three-dimensional model data and plans a scanning path;
step S3: inputting the data processed by the slicing software in the step S2 into a rapid prototyping system for controlling a laser beam scanning path to obtain two-dimensional information data of each layer of slices, and performing rapid prototyping to obtain the dental implant with the porous structure;
step S4: and (4) performing optimization treatment on the porous dental implant obtained in the step (S3).
According to the technical scheme, three-dimensional modeling is carried out on the dental implant with the porous structure according to different user requirements to obtain an accurate three-dimensional model of the dental implant with the porous structure, the obtained three-dimensional model is subjected to data storage, then three-dimensional model data is converted into a file format for processing slicing software, the slicing software is subjected to slicing processing, the dental implant with the porous structure is obtained through rapid molding processing, and the dental implant with the porous structure is subjected to optimization processing to finally obtain the dental implant with the porous structure for implantation; the porous structure can effectively reduce the phenomenon of stress shielding and can also promote the combination and growth of the implant and the bone interface; the molded porous dental implant is prepared by adopting a selective laser melting technology and an additive manufacturing process, so that the complex space pore structure can be accurately prepared, and the stable interface combination between the porous dental implant and the bone tissue can be realized.
On the basis of the above scheme and as a preferable scheme of the above scheme, the optimization processing procedure in the step S4 includes the steps of:
step Q1: ultrasonically cleaning the intermediate by sequentially using acetone, absolute ethyl alcohol and purified water;
step Q2: the intermediate obtained after step Q1 was sandblasted with 60 mesh alumina grit at a pressure of 0.3MPa for 1-2 min.
Step Q3: carrying out acid etching treatment on the intermediate obtained after the step Q2;
step Q4: and D, sequentially carrying out absolute ethyl alcohol dehydration treatment and pure water washing on the porous dental implant obtained after the step Q3, and drying in an oven.
According to the technical scheme, the surface roughness of the porous structure implant is increased by adopting cleaning and sand blasting methods through optimization treatment, the rough surface of the porous structure implant can promote the proliferation and differentiation of osteocytes, and the bone forming speed around the porous structure implant and the quality of surrounding bones are increased, so that higher bone combination rate and combination strength are obtained, the growth combination state of the surrounding bones is promoted, and the combination area of important parameters such as the amount of the implant bones and the volume of the implant bones is promoted.
On the basis of and as a preferable aspect of the above aspect, the rapid prototyping process in step S3 includes the steps of:
step M1: feeding the raw material powder to a predetermined area by a feeding mechanism;
step M2: the powder paving mechanism paves and compacts raw material powder;
step M3: the laser beam is scanned under the control of the computer, and the raw material powder is melted and sintered according to the obtained two-dimensional data;
step M4: repeating the process of the step M3 until the intermediate printing of the porous dental implant is completed;
step M5: cooling the porous dental implant obtained in step S4;
step M6: and (4) cleaning the porous dental implant cooled in the step M5.
According to the technical scheme, the specific process of rapid prototyping treatment adopts a layer-by-layer superposition manufacturing method to obtain the integrated porous dental implant.
On the basis of the above scheme and as a preferable scheme of the above scheme, a gas protection environment is further included in the step M3, and the gas in the gas protection environment is argon.
According to the technical scheme, the protective gas is responsible for removing the active gas around the molten pool so as to prevent adverse effects caused by reaction with the atmosphere, and the porous dental implant manufactured under the protection of argon has slightly high strength and ductility.
On the basis of the above scheme and as a preferable scheme of the above scheme, step M1 is preceded by a raw material powder obtaining process of preparing titanium alloy powder from a titanium alloy bar by a gas atomization method or an iso-centrifugal rotary atomization method.
The technical scheme discloses that the raw material powder is titanium alloy powder, and discloses an obtaining method of the titanium alloy powder.
On the basis of the above scheme and as a preferable scheme of the above scheme, the cold treatment process in the step M5 is to first place the porous dental implant obtained in the step M4 in the powder of a vacuum chamber for cooling, and when the temperature is reduced to 100 ℃ and 150 ℃, take out the porous dental implant and further cool to room temperature;
the cleaning treatment in the step M6 is to clean and remove powder on the intermediate in the step M5.
According to the technical scheme, the cooling treatment process is divided into two stages of cooling, the first stage is firstly carried out on the cooling treatment of the vacuum chamber, and deformation caused by contact between a high-temperature state and the outside air is avoided; in the second stage, when the porous dental implant is cooled to 100-150 ℃, the porous dental implant is taken out and further cooled to room temperature. Through the stepped cooling of the first stage and the second stage, the accuracy of the whole structure of the porous structure dental implant can be maintained at the cooled room temperature.
The utility model provides a porous structure dental implant, includes the implant main part, have the porous structure that reduces the elastic modulus between implant main part and the bone tissue in the implant main part, the implant main part is titanium alloy material, titanium alloy's chemical composition percentage is: 0.12-0.20% of O, 0.002-0.015% of H, 0.018-0.05% of N, 0.016-0.10% of C, 0.17-0.30% of Fe, 3.5-4.50% of V, 5.50-6.80% of Al and the balance of Ti.
According to the technical scheme, the dental implant with the porous structure can effectively reduce the stress shielding phenomenon and promote the combination and growth of the implant and a bone interface; the molded porous dental implant is prepared by adopting a selective laser melting technology and an additive manufacturing process, so that the complex space pore structure can be accurately prepared, and the stable interface combination between the porous dental implant and the bone tissue can be realized.
Compared with the prior art, the invention has the following beneficial effects:
1. the preparation method can be customized according to the requirements, the dental implant obtained by the preparation method and the porous structure on the dental implant are integrated, and the mechanical properties of each direction of the dental implant and each mechanical property of the cortical bone tissue of the alveolar bone are matched with each other; the porous structure can effectively reduce the phenomenon of stress shielding and can also promote the combination and growth of the implant and the bone interface; the molded porous dental implant is prepared by adopting a selective laser melting technology and an additive manufacturing process, so that the complex space pore structure can be accurately prepared, and the stable interface combination between the porous dental implant and the bone tissue can be realized.
2. The optimization treatment adopts the methods of cleaning and sand blasting to increase the surface roughness of the porous structure implant, the rough surface of the porous structure implant can promote the proliferation and differentiation of osteocytes, and increase the bone forming speed around the porous structure implant and the quality of surrounding bones, so that higher bone combination rate and combination strength are obtained, the growth combination state of the surrounding bones is promoted, and the combination area of important parameters such as the amount of the implant bones and the volume of the implant bones is promoted. After sand blasting and cleaning in the optimized treatment process, the cleanness and tidiness of the implant and the sterility and non-toxicity of the implant can be promoted, the growth and implantation of the implant can be better promoted, and the growth state of the implant can be better.
3. The protective gas is responsible for removing the reactive gas around the molten pool to prevent adverse effects from reaction with the atmosphere, and the porous dental implant manufactured under the protection of argon has slightly high strength and ductility.
4. The cooling treatment process is divided into two stages of cooling, the first stage is to carry out the cooling treatment of the vacuum chamber firstly, and the porous structure dental implant in the high-temperature state is prevented from deforming when being contacted with the outside air; in the second stage, when the porous dental implant is cooled to 100-150 ℃, the porous dental implant is taken out and further cooled to room temperature. Through the stepped cooling of the first stage and the second stage, the intermediate body of the porous structure can maintain the accuracy of the integral state at the same time of the cooled room temperature.
5. A dental implant with a porous structure can effectively reduce the phenomenon of stress shielding and can also promote the combination and growth of the implant and a bone interface; the molded porous dental implant is prepared by adopting a selective laser melting technology and an additive manufacturing process, so that the complex space pore structure can be accurately prepared, and the stable interface combination between the porous dental implant and the bone tissue can be realized.
6. The molded porous dental implant is prepared by adopting a laser selective melting technology and an additive manufacturing process, the defects of the traditional processing and manufacturing are overcome, the preparation technology of the porous dental implant with the characteristics of accuracy, intelligence and nano-scale is realized, the mechanical strength of the porous dental implant is increased, the hardness is improved, the biological compatibility is increased, and the combination of the porous dental implant and bone and the bone absorption are promoted.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic flow chart of a method for preparing a porous dental implant according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of a regular hexahedral frame structure hole according to a first embodiment of the present invention;
fig. 3 is a schematic perspective view of a G7 structural hole provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic perspective view of a composite structural aperture provided in accordance with an embodiment of the present invention;
FIG. 5 shows the microscopic morphology of the pore structure of the regular hexahedral frame structure under the scanning electron microscope of the present invention;
FIG. 6 shows the micro-morphology of the pore structure of the G7 structure under the scanning electron microscope of the present invention;
FIG. 7 shows the microstructure of the composite structure pore structure under a scanning electron microscope.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
For a better illustration of the invention, the invention is described in detail below with reference to the accompanying figures 1-7.
The first embodiment is as follows:
a preparation method of a dental implant with a porous structure comprises the following steps:
step S1: three-dimensionally modeling the dental implant with the porous structure, and storing data of the three-dimensional model; in this embodiment, the porous dental implant is three-dimensionally modeled according to different user requirements, so as to obtain an accurate three-dimensional model of the porous dental implant, and the obtained three-dimensional model is subjected to data storage.
Step S2: converting the three-dimensional model data in the step S1 into a file format for slicing software processing, wherein the slicing software slices the acquired three-dimensional model data and plans a scanning path; the file format processed by the slicing software in this embodiment is an STL format file, and it should be noted that the thickness of the slice in this embodiment is 10-30 μm. In other implementations, the file format processed by the slicing software may be OBJ, AMF or 3MF, which are within the scope of the present invention.
Step S3: inputting the data processed by the slicing software in the step S2 into a rapid prototyping system for controlling a laser beam scanning path to obtain two-dimensional information data of each layer of slices, and performing rapid prototyping to obtain the dental implant with the porous structure;
the rapid prototyping process in this embodiment includes the following steps:
step M1: feeding the raw material powder to a predetermined area by a feeding mechanism; it should be noted that, before the step M1, a raw material powder obtaining process is further included, the raw material in this embodiment is a titanium alloy, and the titanium alloy powder obtaining process is to prepare titanium alloy powder from a titanium alloy bar by a gas atomization method or an iso-centrifugal rotary atomization method. It should be noted that the titanium alloy powder of the present embodiment is in the form of a spherical Ti6Al4V (TC4) alloyGold powder with theoretical density of 4.43g/cm3, titanium alloy powder with loose density of 2.50g/cm3 and tap density of 2.80g/cm3, titanium alloy powder with particle size diameter of 20-45 μm and flowability of not more than 25s/50g, and d10Controlled at 15 +/-3 mu m, d50Controlled at 43 +/-3 mu m, d90Controlling the particle size to be 67 +/-3 mu m; in addition, the sphericity of the titanium alloy powder in the embodiment is 90%, the titanium alloy powder has good fluidity and dispersibility, the particle size of the powder is 10-100 μm, and impurities are not generated.
It should be noted that in this embodiment, the titanium alloy powder is prepared by an additive manufacturing process using a selective laser melting (3D printing) technology, and the device is a laser rapid prototyping device manufactured by EOSs of germany, which is model number eosin M28 and is equipped with a Yb-fiber laser emitter, and the maximum prototyping size is 250mm × 250mm × 325 mm.
Step M2: the powder paving mechanism paves and compacts the titanium alloy powder; in this example, the titanium alloy powder was laid on the substrate, and the thickness of the titanium alloy powder was 30 to 50 μm.
Step M3: the laser beam is scanned under the control of the computer, and the raw material powder is melted and sintered according to the obtained two-dimensional data; the process parameters of the laser beam for rapidly melting the powder according to the slice shape and the scanning path in the embodiment are as follows: the laser power is 160-200W, the scanning speed is 1200-1800mm/s, the spot diameter is 0.1-0.3mm, the powder spreading thickness is 0.03-0.05mm, and the scanning lap ratio is 0.06-0.07. It should be noted that argon gas can be used as protective atmosphere during melting and sintering, the lowest oxygen content can be controlled within 0.1%, the density of the formed part can reach more than 98%, the argon gas is responsible for removing active gas around the molten pool to prevent adverse effect caused by reaction with the atmosphere, and the porous dental implant manufactured under the protection of argon gas has slightly high strength and ductility. It is worth mentioning that, in the embodiment, the argon gas is filled into the forming chamber of the dental implant by combining the vacuum pumping and the replacement, and the specific process is to first vacuum the forming chamber and then fill the forming chamber with the argon gas.
Step M4: repeating the process of the step M3 until the intermediate printing of the porous dental implant is completed; specifically, a printer is started, a laser beam is controlled by a computer to scan titanium alloy powder on a substrate in a forming chamber filled with argon gas through melting and sintering according to obtained two-dimensional data, the computer calculates the two-dimensional data of each layer according to the slicing data of each layer, the laser beam performs layer-by-layer printing according to the sliced two-dimensional data of each layer, and the actions are repeated until the printing of the porous dental implant is completed.
Step M5: cooling the porous dental implant obtained in step S4; in the embodiment, the cooling treatment process is divided into two stages of cooling, the first stage is to carry out the cooling treatment of the vacuum chamber firstly, so that the porous dental implant is prevented from deforming when being contacted with the outside air in a high-temperature state; in the second stage, when the porous dental implant is cooled to 100-150 ℃, the porous dental implant is taken out and further cooled to room temperature. Through the stepped cooling of the first stage and the second stage, the accuracy of the whole structure of the porous structure dental implant can be maintained at the cooled room temperature.
Step M6: and (4) cleaning the porous dental implant cooled in the step M5. The cleaning treatment in this embodiment is to remove the excess powder adhered to the porous dental implant.
Step S4: and (4) performing optimization treatment on the porous dental implant obtained in the step (S3). The optimization processing procedure in step S4 in this embodiment includes the following steps:
step Q1: cleaning the intermediate by using acetone, absolute ethyl alcohol and purified water sequentially and ultrasonically; the specific cleaning process in this embodiment is as follows: and ultrasonically cleaning the processed and molded porous dental implant by using acetone, absolute ethyl alcohol and purified water in sequence, wherein each cleaning solution is cleaned for 20-30min, and each structure is cleaned for 3-4 times.
Step Q2: the intermediate obtained after step Q1 was sandblasted with 60 mesh alumina grit at a pressure of 0.3MPa for 1-2 min. In the embodiment, after the sand blasting, the sand is washed by absolute ethyl alcohol and purified water for 3 to 4 times, each time for 15 to 20 min. The sand blasting material is Al2O3Without affecting the color of the workpiece and with high processing speedThe quality is high.
Step Q3: carrying out acid etching treatment on the intermediate obtained after the step Q2; in the implementation, a mixed solution of nitric acid (68% argon) and hydrofluoric acid (more than or equal to 40% argon) is adopted, and the specific proportion is as follows (volume ratio): 5.5 to 6.5 percent of nitric acid, 3 to 4 percent of hydrofluoric acid and 89.5 to 91.5 percent of purified water; the acid etching treatment process comprises the steps of pouring prepared acid liquor into a plastic beaker, enabling the liquid level of the mixed solution to be 10-20 mm higher than that of the titanium alloy dental implant, putting the titanium alloy dental implant into the plastic beaker for acid etching, keeping the temperature at 20-25 ℃, treating for 10-20 s, immediately fishing out the titanium alloy dental implant after the acid etching is finished, putting the titanium alloy dental implant into purified water for third cleaning for 3-4 times, and cleaning for 4-8min each time, wherein the acid etching aims to further reduce the roughness of the surface and remove Al2O3And (4) remaining.
Step Q4: and (4) sequentially carrying out absolute ethyl alcohol dehydration treatment and pure water washing on the porous dental implant obtained after the step Q3, and drying the porous dental implant through an oven. Specifically, the porous dental implant is placed in absolute ethyl alcohol for dehydration for 40min to 45min, the porous dental implant is taken out and washed by purified water for 13min to 20min, and the porous dental implant is placed in an oven for drying at 90 ℃ to 100 ℃, wherein the baking time in the oven is 25min to 35 min.
The optimization treatment adopts the methods of cleaning and sand blasting to increase the surface roughness of the porous structure implant, the rough surface of the porous structure implant can promote the proliferation and differentiation of osteocytes, and increase the bone forming speed around the porous structure implant and the quality of surrounding bones, so that higher bone combination rate and combination strength are obtained, the growth combination state of the surrounding bones is promoted, and the combination area of important parameters such as the amount of the implant bones and the volume of the implant bones is promoted.
The preparation method can be customized according to requirements, and the printing method integrates the dental implant obtained by the invention and the porous structure on the dental implant, so that the anisotropic mechanical properties of the porous structure dental implant and the mechanical properties of the cortical bone tissue of the alveolar bone are matched with each other; the porous structure can effectively reduce the phenomenon of stress shielding and can also promote the combination and growth of the implant and the bone interface; the molded porous dental implant is prepared by adopting a selective laser melting technology and an additive manufacturing process, so that the complex space pore structure can be accurately prepared, and the stable interface combination between the porous dental implant and the bone tissue can be realized.
Example two:
the utility model provides a porous structure dental implant, includes the implant main part, has the porous structure who reduces the elastic modulus between implant main part and the bone tissue in the implant main part, and the implant main part is titanium alloy material, and titanium alloy's chemical composition percentage is: 0.12-0.20% of O, 0.002-0.015% of H, 0.018-0.05% of N, 0.016-0.10% of C, 0.17-0.30% of Fe, 3.5-4.50% of V, 5.50-6.80% of Al and the balance of Ti.
A dental implant with a porous structure can effectively reduce the phenomenon of stress shielding and can also promote the combination and growth of the implant and a bone interface; the molded porous dental implant is prepared by adopting a selective laser melting technology and an additive manufacturing process, so that the complex space pore structure can be accurately prepared, and the stable interface combination between the porous dental implant and the bone tissue can be realized.
In this embodiment, the specific structure of the porous structure is at least one of a cubic frame structure, a G7 structure, and a composite structure, as shown in fig. 2, the specific example of the cubic frame structure in this embodiment is a cubic hollow structure, as shown in fig. 3, the specific example of the G7 structure in this embodiment is worth mentioning, the G7 structure refers to a truss-like lattice material unit structure, which is not described herein, and as shown in fig. 4, the composite structure in this embodiment is a composite structure of the cubic frame structure and the G7 structure.
The titanium alloy in the embodiment comprises the following specific components: 0.12% of O, 0.002% of H, 0.018% of N, 0.016% of C, 0.17% of Fe, 4.0% of V, 6.4% of Al and the balance of Ti.
As shown in fig. 5 to 7, in the practical example of the porous structure in the present embodiment, as shown in fig. 5, when the smallest pore unit of the porous structure is a regular hexagonal frame pore, the microscopic morphology of the pore structure of the regular hexagonal frame structure under the scanning electron microscope is shown. As shown in FIG. 6, the smallest pore unit of the porous structure is a G7 structure, and the microscopic morphology of the pore structure of the G7 structure is under a scanning electron microscope. As shown in fig. 7, the smallest pore unit of the porous structure is a composite structure pore, which is a micro-morphology of the composite structure pore structure under the scanning electron microscope of the present invention, and it should be noted that, in this embodiment, the composite structure pore is a combined pore of a regular hexagonal frame pore and a G7 structure pore. In other embodiments, the smallest unit of the porous structure may be other structures, or other structural designs that reduce the phenomenon of stress shielding and promote the bonding and growth of the implant to the bone interface are also within the scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (7)
1. The utility model provides a porous structure dental implant, includes the implant main part, its characterized in that, have the porous structure who reduces the elastic modulus between implant main part and the bone tissue in the implant main part, the implant main part is titanium alloy material, titanium alloy's chemical composition percentage is: 0.12-0.20% of O, 0.002-0.015% of H, 0.018-0.05% of N, 0.016-0.10% of C, 0.17-0.30% of Fe, 3.5-4.50% of V, 5.50-6.80% of Al and the balance of Ti.
2. A preparation method of a dental implant with a porous structure is characterized by comprising the following steps:
step S1: three-dimensionally modeling the dental implant with the porous structure, and storing data of the three-dimensional model;
step S2: converting the three-dimensional model data in the step S1 into a file format for slicing software processing, wherein the slicing software slices the acquired three-dimensional model data and plans a scanning path;
step S3: inputting the data processed by the slicing software in the step S2 into a rapid prototyping system for controlling a laser beam scanning path to obtain two-dimensional information data of each layer of slices, and performing rapid prototyping to obtain the dental implant with the porous structure;
step S4: and (4) performing optimization treatment on the porous dental implant obtained in the step (S3).
3. The method for preparing a porous dental implant according to claim 2, wherein the optimization process of step S4 comprises the following steps:
step Q1: ultrasonically cleaning the intermediate by sequentially using acetone, absolute ethyl alcohol and purified water;
step Q2: the intermediate obtained after step Q1 was sandblasted with 60 mesh alumina grit at a pressure of 0.3MPa for 1-2 min.
Step Q3: carrying out acid etching treatment on the intermediate obtained after the step Q2;
step Q4: and D, sequentially carrying out absolute ethyl alcohol dehydration treatment and purified water washing on the intermediate obtained after the step Q3, and drying in an oven to obtain the finished body of the dental implant with the porous structure.
4. The method of claim 2, wherein the rapid prototyping process in step S3 includes the steps of:
step M1: feeding the raw material powder to a predetermined area by a feeding mechanism;
step M2: the powder paving mechanism paves and compacts raw material powder;
step M3: the laser beam is scanned under the control of the computer, and the raw material powder is melted and sintered according to the obtained two-dimensional data;
step M4: repeating the process of the step M3 until the porous dental implant is printed;
step M5: cooling the porous dental implant obtained in step S4;
step M6: and (4) cleaning the porous dental implant cooled in the step M5.
5. The method of claim 4, further comprising a gas-shielded environment in step M3, wherein the gas in the gas-shielded environment is argon.
6. The method of claim 4, wherein the step M1 is preceded by a raw material powder obtaining step, wherein the raw material powder obtaining step is carried out by subjecting the titanium alloy bar to gas atomization or iso-centrifugal rotary atomization to obtain the titanium alloy powder.
7. The method as claimed in claim 4, wherein the step M5 is performed by placing the porous dental implant obtained in step M4 in powder in a vacuum chamber for cooling, and taking out the porous dental implant and further cooling to room temperature when the temperature is reduced to 100-150 ℃;
the cleaning treatment in the step M6 is to clean and remove the powder on the porous dental implant in the step M5.
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| CN115381570A (en) * | 2022-08-30 | 2022-11-25 | 江苏万疆高科技有限公司 | Truss structure-based 3D printing porous implant and manufacturing method thereof |
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