LU102180B1 - Process for the production of a dental implant blank - Google Patents

Abstract

The present invention discloses a method of manufacturing a dental implant blank comprising the following steps: 1) a dental implant blank model is constructed with SD software; 2) The STL format document is imported into Magics software to obtain a dental implant blank STL model; 3) A metal powder in 60 to 70% by weight of the raw materials and a binder in 30 to 40% by weight of the raw materials are uniformly mixed to obtain a mixture; 4) A dental implant preform is obtained by a metal injection molding method based on a dental implant blank STL model, and then the adhesive is removed to obtain a dental implant metal forming blank; 5) A final dental implant blank product is obtained by high temperature sintering. The present invention produces a final dental implant blank product with high accuracy and high density by the introduction of a metal injection molding process, which can uniquely shape the relatively complex surface microstructure of the dental implant and avoid secondary machining processes.

Description

i LU102180 Process for producing a dental implant blank

TECHNICAL FIELD The present invention relates to the field of dental implants, in particular to a method for manufacturing a dental implant blank.

BACKGROUND ART Implant restoration is currently the best restoration method because it can restore the aesthetics and chewing function of patients with malfunctioning teeth. Most of the existing dental implants are machined and molded, however, in the case of a dental implant having a complicated porous structure, conventional machining cannot realize manufacture for the complicated structure thereof. In addition, the elastic modulus and yield strength of solid machined dental implants are much greater than those of bone tissue, and stress shielding effects are easy to occur, thereby affecting the regeneration of the bone tissue, not promoting bone connection and ultimately affecting the stability and life of the implant . With the development of 3D printing technology (Selection Laser Meloding Technology: SLM), dental implants were made by 3D printing processes to solve the problem of tension shielding. However, the production of dental implants with a complicated structure by 3D printing is associated with a certain limitation in the machining accuracy, whereby there is a possibility of defects appearing during machining, whereby stress concentration occurs on the fine structures, which ultimately leads to that the mechanical strength of the final dental implant product is not up to standard. For example, when an implant with a porous structure is manufactured using a 3D printing technique, the pore diameter and the thickness of the porous structure must be 0.5 mm or more. In addition, the dimensional accuracy after compression molding is not high, and there is an error of 0.025-0.05mm, and the surface roughness of the printing component can only reach Ra 10-30 µm, with the grinding and polishing work being carried out on the printing component is greatly increased after it has been printed, which also affects the dimensional accuracy of the printing member, the strength and fatigue resistance of the printing member after molding are low, and the processing errors and stress concentrations may occur, thereby preventing the process of bonding the printing member to the Bone is affected.

SUMMARY OF THE PRESENT INVENTION 40 The present invention aims to provide a method of manufacturing a dental implant blank according to the above deficiency in the prior art, the manufacturing method being suitable for manufacturing a dental implant having a complicated structure and the minimum size and thickness of the final product can be only 0.2 mm and at the same time has a high compactness, high strength and high toughness.

The technical solution used by the present invention is: a method for manufacturing a dental implant blank comprises the following process steps: 1) a dental implant blank model is constructed with 3D software to obtain an STL format document; 2) The STL format document is imported into Magics software, the structure type of the dental implant and the fine structure parameters are designed and output to obtain a tame implant blank STL model; 3) A metal powder in 60 to 70% by weight of the raw materials and a binder in 30 to 40% by weight of the raw materials are uniformly mixed to obtain a mixture; 4) According to the dental implant blank STL model from step 2), the mixture obtained from step 3) is fed into a feeding machine, whereby a dental implant preform is obtained by means of a metal injection molding process, wherein the adhesive is then removed to form a dental implant metal forming blank to obtain; 5) The dental implant metal-forming blank obtained from step 4) is subjected to high-temperature sintering, a final dental implant blank being obtained after heat preservation.

The surface of an existing dental implant generally has a relatively complex microstructure, such as a porous structure with microgrooves, which microstructure enables an effective increase in the self-cutting ability of the entire dental implant and an increase in the contact area with the alveolar bone, thereby efficiently accelerating the bone bonding process becomes. With the continuous improvement of the metal injection molding technique, an attempt has gradually been made to be used in fields of engineering, medical machines and the like. Metal injection molding technology, however, places extremely high demands on the adaptability of important process parameters and materials, whereby, for example, the special limitation of the injection molding material used and the precise control of the heating temperature have a significant influence on the respective properties of the end products obtained by metal injection molding.

In particular, limiting the amount of metal powder and binder added in step 3} of the invention enables the metal powder in the mixture to be evenly coated with binder and formed into granules, which ensures effective removal of the binder and good sintering shrinkage during subsequent processing As a further improvement of the above solution, the heating temperature of the metal injection molding process described in step 4} of the present invention is 300-600 ° C, which is effective in removing 98% of the binder in the dental implant metal forming blank,

The present invention uses metal injection molding, rather than the existing 3D printing technique, to process such dental implants with a relatively complex microstructure on the surface, with a single molding to obtain a final dental implant blank, and with the minimum thickness of the product size up to zero .2mm, the product has a dimensional accuracy of + 0.1-0.3% and a surface roughness of Ra 0.8-1.6 µm and a relative density of 95-99%, with its mechanical properties such as strength , Hardness, elongation and the like are better than those in the final product obtained from 3D printing; while secondary processing can be avoided | As a further improvement of the above solution, the sintering temperature of the high temperature sintering described in step 5) is 1100-1400 ° C, which enables a complete removal of the binding agent in the dental implant metal forming blank.

As a further improvement of the above solution, the heat preservation time of the heat preservation described in step 5} is 3-4 hours, which is advantageous for improving the stability of the sintering shrinkage of the final dental implant blank product.

As a further improvement of the above solution, the particle diameter of the metal powder described in step 3) is 0.5 to 20 µm.

Specifically, the metal powder in the present invention is selected from materials with relatively small particle diameters, which have a large specific surface area, are easy to shape and sinter, and at the same time are adapted to the process parameters of the metal injection molding process.

As a further improvement of the above solution, the metal powder described in step 3) is selected from one of titanium, tantalum, molybdenum, rhenium and their alloys.

As a further improvement of the above solution, the type of structure of the dental implant described in step 2) is a porous diamond structure or a porous honeycomb structure, both of which have the properties of a porous connection, which effectively improves the bone bonding ability of the dental implant.

As a further improvement of the above-mentioned solution, the fine structure parameters described in step 2) relate to the pore diameter, the pore depth and the porosity.

As a further improvement of the above solution, the binder described in step 3) is an aqueous solution of polyethylene glycol which is excellent in conformity with the metal powder of the present invention, and a mixture having a good flowability can be obtained.

As a further improvement of the above solution, the relative density of the final dental implant blank obtained from step 5) is> 95%. The advantageous effects of the invention are: The present invention produces a final dental implant blank product with high accuracy and high density by the introduction of a metal injection molding process, whereby it can uniquely shape the relatively complex surface microstructure of the dental implant and avoid secondary machining processes.

The final dental implant blank made in accordance with the present invention exhibits good integrity and better mechanical

Properties such as strength, hardness, elongation, etc., as 3D printed products.

BRIEF DESCRIPTION OF THE DRAWING Figure 1 is a schematic representation of a course of the manufacturing process in accordance with the present invention.

DETAILED DESCRIPTION The present invention will be described in detail in connection with exemplary embodiments in order to facilitate the understanding of the present invention for those skilled in the art. At this point, it should be pointed out that exemplary embodiments are only used to further illustrate the present invention and are not used can be understood as limiting the scope of the present invention. The non-essential improvements and adaptations made to the present invention by those skilled in the art, based on the above-mentioned content of the invention, should still fall within the scope of the present invention. At the same time, the raw materials not described in detail below are all commercially available products; wherein the process steps or manufacturing methods not mentioned in detail are process steps or manufacturing methods that are known to those skilled in the art.

Embodiment 1 A method for producing a dental implant blank, the production process sequence of which is shown schematically as in FIG. 1, has the following process steps in particular: 1} A dental implant blank model is constructed with 3D software in order to assign an STL format document receive; 2) The STL format document is imported into Magics software, the structure type of the dental implant and the fine structure parameters are designed and output to obtain a dental implant blank STL model; 3) A titanium alloy powder having a particle diameter of 5 µm in 60% by weight of the raw materials is uniformly mixed with an aqueous solution of polyethylene glycol in 40% by weight of the raw materials to obtain a mixture; 4) According to the dental implant blank STL model of step 2), the mixture obtained from step 3) is fed into a feeding machine, whereby a dental implant preform is obtained by a metal injection molding method with the heating temperature being 300 ° C, and then the adhesive is removed to obtain a dental implant metal forming blank; 40 5) The dental implant metal-forming blank obtained from step 4} is subjected to high-temperature sintering at 1400 ° C. and heat preservation for 3 hours, then a dental implant blank end product of the exemplary embodiment! is obtained.

Specifically, in exemplary embodiment 1, the type of structure of the dental implant is designed as a hollow structure with 0.2 mm machining allowance inside and a pordse diamond structure with 5 porous and interconnected surfaces, the fine structure parameters having a pore diameter of 0.2 mm and a thickness of the porous layer of 0.4mm, a depth of the microgrooves of 0.05mm, a width of the microgrooves of 0.15 mm and a minimum thickness of the product size of 0.2 mm.

By examining the associated properties on the dental implant, the sample of the final tame implant blank of this embodiment 1 has a dimensional accuracy of + 0.1%, a relative density of 99% and a surface roughness of Ra 0.8 µm, a yield strength of 934.4 MPa and an elongation of 10%. COMPARATIVE EXAMPLE 1 A method for producing a dental implant blank, the production process sequence of which is shown schematically as in FIG. 1, has the following process steps in particular: 1) A dental implant blank model is constructed with 3D software in order to assign an STL format document receive; 2) The STL format document is imported into Magics software, the structure type of the dental implant and the fine structure parameters are designed and output to obtain a dental implant blank STL model; 3) A titanium alloy powder having a particle diameter of 5 µm in 85% by weight of the raw materials is uniformly mixed with an aqueous solution of polyethylene glycol in 15% by weight of the raw materials to obtain a mixture; 4) According to the dental implant blank STL model of step 2), the mixture obtained from step 3) is fed into a feeding machine, whereby a dental implant preform is obtained by a metal injection molding method with the heating temperature being 300 ° C, and then the adhesive is removed to obtain a dental implant metal forming blank; 5) The dental implant metal forming blank obtained from step 4} is subjected to high-temperature sintering at 1400 ° C. and heat preservation for 3 hours, after which a final dental implant blank product of the embodiment] is obtained.

Specifically, in Comparative Example 1, the type of structure of the dental implant is designed as a hollow structure with 0.2 mm machining allowance inside and a porous diamond structure with porous and interconnected surfaces, the fine structure parameters being a pore diameter of 0.2 mm, a thickness of the pordsen layer of 0.4mm, a depth of the microgrooves of 0.05mm, a width of the 40 microgrooves of 0.15mm and a minimum thickness of the product size of 0.2 mm. By examining the associated properties on the dental implant, the sample of the final tame implant blank of this comparative example 1 has a dimensional accuracy of + 0.4%, a relative density of 93%, a surface roughness of Ra 1.0 μm, a yield strength of 860.5 MPa and an elongation of 7.3%.

Comparative Example 2 A method of manufacturing a dental implant by 3D printing, specifically comprising the following steps: 1} A dental implant model is designed with 3D software to obtain an STL format document; 2) The STL format document is imported into Magics software, and the structure type of the dental implant and the fine structure parameters are designed and output to obtain a dental implant STL model; 3) According to the dental implant STL model in step 2}, the process parameters of the 3D printing are specifically selected as follows: the laser power of 200w, the scanning speed of 8000 mm / s, the scanning distance of 0.15 mm, the thickness of the laid Powder of 80 µm, the diameter of the light spot of 50 µm, the humidity of <49%; 4) By setting the essential process parameters in step 3), a titanium alloy powder with a particle diameter of 15 µm is selected and the dental implant is compression molded with a 3D printing device from DigiMaker-2250. Specifically, in Comparative Example 1, the type of structure of the dental implant is formed as a hollow structure with 0.2 mm machining allowance inside and a porous diamond structure with porous and interconnected surfaces, the fine structure parameters being a pore diameter of 0.4 mm, a thickness of the porous layer of 0.5 mm, a depth of the micro-grooves of 0.1 mm, a width of the micro-grooves of 0.15 mm and a minimum thickness of the product size of 0.5 mm. By examining the associated properties on the tooth implant, the sample of the tooth implant blank end product of this comparative example 1 has a dimensional accuracy of + 63 μm, a relative density of 90% and a surface roughness of Ra 6.5 μm, a yield strength of 493 MPa and an elongation of 4, 6% up.

Embodiment 2 A method for producing a dental implant blank comprises the following method steps: 1} A dental implant blank model is constructed with 3D software to obtain an STL format document; 2) The STL format document is imported into Magics software, the structure type of the dental implant and the fine structure parameters are designed and output to obtain a dental implant blank STL model; 3) A titanium alloy powder having a particle diameter of 5 µm in 70% by weight of the raw materials is uniformly mixed with an aqueous solution of polyethylene glycol in 30% by weight of the raw materials to obtain a mixture; 4) According to the dental implant blank STL model of step 2), the mixture obtained from step 3) 40 is fed into a feeding machine, whereby a dental implant preform is obtained by a metal injection molding method, the heating temperature is 600 ° C, and then the adhesive removed to obtain a dental implant metal forming blank;

5) The dental implant metal-forming blank obtained from step 4) is subjected to high-temperature sintering at 1100 ° C. and after heat preservation for 4 hours, after which a final dental implant blank of embodiment 2 is obtained.

Specifically, in exemplary embodiment 2, the type of structure of the dental implant is designed as a hollow structure with Q © 1 mm machining allowance inside and a porous diamond structure with porous and interconnected surfaces, the fine structure parameters being a pore diameter of 0.3 mm, a thickness of the porous layer of 0, 35mm, a depth of the microgrooves of 0.1mm, a width of the microgrooves 19 of 0.1mm and a minimum thickness of the product size of 0.2mm a painting accuracy of + 0.3%, a relative density of 95%, a surface roughness of Ra 1.6um, a yield point of 920.8 MPa and an elongation of 10.8%.

Embodiment 3 A method for producing a dental implant blank comprises the following method steps: 1) A dental implant blank model is constructed with 3D software to obtain an STL format document; 2) The STL format document is imported into Magics software, the structure type of the dental implant and the fine structure parameters are designed and output to obtain a dental implant blank STL model; 3) A tantalum alloy powder having a particle diameter of 0.5 µm in 65% by weight of the raw materials is uniformly mixed with an aqueous solution of polyethylene glycol in 35% by weight of the raw materials to obtain a mixture; 4) According to the dental implant blank STL model of step 2), the mixture obtained from step 3) is fed into a feeding machine, whereby a dental implant preform is obtained by a metal injection molding method, the heating temperature is 4500 ° C, and then the adhesive is removed to obtain a dental implant metal forming blank of Embodiment 3; 5) The dental implant metal forming blank obtained from step 4} is subjected to sintering at 1250 ° C. and after heat preservation for 3.5 hours, after which a final dental implant blank product is obtained.

Specifically, in embodiment 3, the type of structure of the dental implant is designed as a hollow structure with 0.15 m machining allowance inside and a porous honeycomb structure with porous and interconnected surfaces, the fine structure parameters being a pore diameter of 0.25 m, a thickness of the porous layer of 0, 4mm, a depth of the microgrooves of 0.08m, a width of the microgrooves of 0.15mm 40 and a minimum thickness of the product size of 0.2 mm.

When examining the related properties on the dental implant, the sample of the final dental implant blank of this embodiment 3 had a dimensional accuracy of + 0.2, a relative density of 98, a surface roughness of Ra 1.0, a yield strength of 918.2 MPa and a Elongation of 11.2%.

Embodiment 4 A method for producing a dental implant blank comprises the following method steps: 1) A dental implant blank model is constructed with 3D software to obtain an STL format document; 2) The STL format document is imported into Magics software, the structure type of the dental implant and the fine structure parameters are designed and output to obtain a dental implant blank STL model; | 3) A molybdenum metal powder with a particle diameter of 20 µm in 70%; 10% by weight of the raw materials is uniformly mixed with an aqueous solution of polyethylene glycol in 30% by weight of the raw materials to obtain a mixture; 4) According to the dental implant root STL model of step 2), the mixture obtained from step 3) is fed into a feeding machine, whereby a dental implant preform is obtained by means of a metal injection molding process, the heating temperature being 500 ° C, and then the adhesive is removed to obtain a dental implant metal forming blank of Embodiment 4; 5) The dental implant metal forming blank obtained from step 4) is subjected to high-temperature sintering at 1300 ° C. and after heat preservation for 4 hours / 20, after which a final tooth implant blank product is obtained. ; Specifically, in exemplary embodiment 4, the type of structure of the dental implant is designed as a hollow structure with 0.1 mm machining allowance inside and a porous honeycomb structure with porous and interconnected surfaces, the fine structure parameters being a pore diameter of 0.2 mm, a thickness of the porous layer of 0, 35mm, a depth of the microgrooves of 0.1mm, a width of the microgrooves of 0.1mm and a minimum thickness of the product size of 0.2mm.

By examining the associated properties on the tooth implant, the sample of the tooth implant blank final product of this embodiment 4 has a Malfi precision of + 0.3%, a relative density of 96%, a surface roughness of Ra 1.2 μm, a yield strength of 928.6 MPa and an elongation of 11.6%.

The above-described embodiments are preferred embodiments of the present invention, and any process similar to the present invention and equivalent changes made should belong to the scope of the present invention,

40

Claims (10)

Claims 1. A method for producing a dental implant blank, characterized in that it comprises the following process steps: 1) A dental implant blank model is constructed with 3D software in order to obtain an STL format document; 2) The STL format document is imported into Magics software, the structure type of the dental implant and the fine structure parameters are designed and output to obtain a dental implant blank STL model; 3) A metal powder in 60 to 70% by weight of the raw materials and a binder in 30 to 40% by weight of the raw materials are uniformly mixed to obtain a mixture; 4) According to the dental implant blank STL model from step 2), the mixture obtained from step 3) is fed into a feeding machine, whereby a dental implant preform is obtained by means of a metal injection molding process, and then the adhesive is removed to produce a dental implant metal forming. Get blank; 5) The dental implant metal forming blank obtained from step 4) is subjected to high-temperature sintering and, after heat preservation, after which a final dental implant blank product is obtained. 2. A method for producing the dental implant blank according to claim 1, characterized in that the heating temperature of the metal injection molding process described in step 4) is 300-600 ° C. 3. The method for producing the dental implant blank according to claim 1, characterized in that the sintering temperature of the high-temperature sintering described in step 5} is 1100-1400 ° C. 4. The method for producing the dental implant blank according to claim 1, characterized in that the heat preservation time of the heat preservation described in step 5) is 3-4 hours. 5. A method for producing the dental implant blank according to claim 1, characterized in that the particle diameter of the metal powder described in step 3) is 0.5 to 20 µm. 6. The method for producing the dental implant blank according to claim 1, characterized in that the metal powder described in step 3} is selected from one of titanium, tantalum, molybdenum, rhenium and their alloys. 7. The method for producing the dental implant blank according to claim 1, characterized in that the type of structure of the dental implant described in step 2} is a porous diamond structure or a porous honeycomb structure. 8. The method for producing the dental implant blank according to claim 1, characterized in that the fine structure parameters described in step 2} relate to the pore diameter, the pore depth and the porosity. 9. The method for producing the dental implant blank according to claim 1, characterized in that the binder described in step 3) is an aqueous solution of polyethylene glycol. 10. The method for producing the tooth implant blank according to claim 1, characterized in that the relative density of the tooth implant blank end product obtained from step 5} is> 95%, 10