CN113751598A - Plastic forming die and method for preparing oral implant - Google Patents
Plastic forming die and method for preparing oral implant Download PDFInfo
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- CN113751598A CN113751598A CN202111323074.5A CN202111323074A CN113751598A CN 113751598 A CN113751598 A CN 113751598A CN 202111323074 A CN202111323074 A CN 202111323074A CN 113751598 A CN113751598 A CN 113751598A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0006—Production methods
- A61C13/0021—Production methods using stamping techniques
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dentistry (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Materials For Medical Uses (AREA)
Abstract
The embodiment of the application provides a plastic forming die and a method for preparing an oral implant, and the method comprises a forming female die for accommodating an oral implant blank; the forming male die is used for extruding and processing the oral implant blank in the forming female die and comprises a supporting seat, a connecting part and a forming part which are sequentially connected, wherein the connecting part and the forming part are used for extruding the blank to form a top groove of the oral implant; the inner side wall of the forming concave die is provided with a plurality of microscopic protrusions for forming microscopic holes on the outer surface of the oral implant, the parts produced by adopting a plastic processing forming mode can form 20-40 microns and 2-4 microns hole structures on the surface of the oral implant in a controllable mode, and meanwhile, the streamline of the metal of the oral implant is basically complete along the direction of the implant, so that the processing cost of the product can be reduced in the aspect of improving the cost rate of the product.
Description
Technical Field
The application belongs to the field of oral medical instruments, and particularly relates to a plastic forming die and a method for preparing an oral implant.
Background
In view of the use of raw materials, the dental implant mainly uses pure titanium or titanium alloy mainly containing titanium (the purpose of using titanium alloy is to increase the strength of the product). Aiming at the requirements of clinical use, the product appearance form meeting the application scene is designed, from the industrial processing perspective, the mainstream processing method is to realize the appearance form of the product by cutting the product, and in recent years, the standard implant product is processed by adopting a 3D printing mode.
With conventional machining methods, mainly cutting processes are used, whereas the metal before cutting is usually a drawn or rolled bar or wire, which is usually internally streamlined from the microstructure of the metal itself. The metal parts obtained by the cutting method inevitably destroy the original streamline inside the metal, and thus the product strength of the formed parts is reduced. In addition, the metal scrap generated by the cutting process will increase the cost of the product manufacturing process (the price of the common raw materials titanium and titanium alloy is expensive). In addition, the oral implant with the small diameter is easy to form fatigue cracking of the mouth part in the clinical use process, and the problem that the product is difficult to solve through a cutting process is solved. In addition, the processing of the oral implant system is often realized by an expensive processing machine, which also increases the cost price of the processing method implant system. By processing the planting system, because the surface of the part obtained by processing is usually a smooth surface, and a subsequent surface treatment process is also needed, a microscopic surface clinically needed by the implant is obtained, which not only makes the processing process more complicated, but also is a main factor for increasing the cost of the implant.
In addition, the oral implant manufactured by 3D printing is economical in use of raw materials, but the strength of the oral implant realized by the process is limited.
Disclosure of Invention
In order to solve one of the above technical drawbacks, an embodiment of the present application provides a plastic forming mold for preparing an oral implant, including: the forming female die is used for accommodating the blank of the oral implant;
the forming male die is used for extruding and processing the oral implant blank in the forming female die and comprises a supporting seat, a connecting part and a forming part which are sequentially connected, wherein the connecting part and the forming part are used for extruding the blank to form a top groove of the oral implant;
the inner side wall of the forming concave die is provided with a plurality of microscopic bulges for forming microscopic holes on the outer surface of the oral implant.
In another aspect, there is also provided a plastic molding method for preparing an oral implant according to an embodiment of the present application, the method including the steps of:
step 1: preparing a titanium or titanium alloy blank;
step 2: placing the blank in an oral implant die for extrusion molding, wherein the deformation rate is controlled at 10-2S-1-10- 4S-1；
And step 3: after the oral implant is extruded and formed, carrying out stress annealing and ultrasonic cleaning;
the inner wall of the forming concave die of the oral implant die is provided with a plurality of microscopic protrusions, and the surface of the oral implant which is formed by extrusion is correspondingly provided with microscopic holes.
By adopting the technical scheme provided by the embodiment of the application, the inner side wall of the forming female die is densely distributed with microstructures which are convex structures and are used for forming the microscopic holes on the outer surface of the oral implant, and the microscopic holes are 20-40 microns and 2-4 microns, compared with the prior high-speed sand blasting impact process, the inner side wall of the forming female die is densely distributed with microstructures, so that the hole structures of 20-40 microns and 2-4 microns formed on the surface of the external structure of the oral implant blank material are controllable, the sizes of the formed microscopic holes are better in consistency, and the microscopic holes can be formulated as required; meanwhile, the forming cavity provided by the embodiment of the application is adopted to carry out plastic forming processing on the oral implant, the metal streamline of the oral implant is basically complete along the direction of the implant, and the oral implant produced by the plastic forming mode is obviously superior to the implant produced by a cutting mode in strength and fatigue life; in addition, due to the adoption of a plastic forming method, the use of materials can be saved to the maximum extent, the production efficiency of products is improved by reducing processing links, and the production cost of the products is reduced to the maximum extent. And because the requirement of the plastic forming processing method on equipment is reduced, the equipment cost of a newly added production line can be reduced, and meanwhile, the consistency of the processed product is good through the plastic forming processing method, the processing cost of the product can be reduced in the aspect of improving the cost rate of the product.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic structural diagram of the present application;
FIG. 2 is a schematic structural view of the assembled state of FIG. 1;
FIG. 3 is a schematic view of the state structure of FIG. 1 after sequential division;
FIG. 4 is a schematic structural view of the forming punch of FIG. 1;
FIG. 5 is a schematic mechanical view of the joint of FIG. 4;
FIG. 6 is a schematic view showing the effect of machining oral implants on metal flow lines by cutting;
fig. 7 is a schematic view showing the effect of plastic molding on metal flow lines in the process of manufacturing the dental implant.
Reference numerals: 1. forming a male die; 11. a supporting seat; 12. a connecting portion; 121. a circular truncated cone; 122. a hexagonal prism; 13. a molding section; 2. an oral implant blank; 3. a first molding female die; 4. and a second forming female die.
Detailed Description
In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Example 1
The embodiment of the application provides a plastic forming die for preparing an oral implant, which comprises a forming concave die and a forming convex die, wherein the forming concave die is used for accommodating an oral implant blank 2; the forming male die 1 is used for extruding and processing the oral implant blank 2 in the forming female die and comprises a supporting seat 11, a connecting part 12 and a forming part 13 which are sequentially connected, wherein the connecting part 12 and the forming part 13 are used for extruding the blank to form a top groove of the oral implant; wherein, the inner side wall of the molding concave die is provided with a plurality of microscopic bulges for forming microscopic holes on the outer surface of the oral implant. In the embodiment, the inner side wall of the forming concave die is densely distributed with microstructures which are convex structures and are used for forming micro holes on the outer surface of the oral implant, the micro holes are 20-40 microns and 2-4 microns, and one or two sizes can be selected according to requirements. Compared with the prior high-speed sand blasting impact process, the inner side wall of the forming concave die is densely distributed with the microstructures, so that the structure of holes with the size of 20-40 micrometers and the size of 2-4 micrometers formed on the surface of the external structure of the oral implant blank 2 are controllable, the sizes of the microscopic holes are relatively good in consistency, and the sizes, the positions, the arrangement modes and the like of the microstructures can be made according to actual requirements.
In the present embodiment, as shown in fig. 4 to 5, the connecting portion 12 is composed of a circular truncated cone 121 and a hexagonal prism 122, the diameter of the circular truncated cone 121 is larger than that of the hexagonal prism 122, the circular truncated cone 121 and the hexagonal prism 122 are used for forming a step-shaped mounting end surface for the internal structure of the oral implant blank 2 when closing the mold, the peripheral side of the forming portion 13 is provided with a thread, the bottom end of the forming portion has a tapered structure, the thread is used for forming a mounting thread for the internal structure of the oral implant blank 2 when closing the mold, the tapered structure is used for forming a bottom taper hole for the bottom of the internal structure of the oral implant blank 2 when closing the mold, and the diameter of the hexagonal prism 122 is larger than that of the forming portion 13.
In this embodiment, the forming die is composed of a first forming die 3 and a second forming die 4, and a forming cavity for accommodating the blank is formed inside the first forming die 3 and the second forming die 4 when they are combined together; the microscopic bulge is arranged on the inner wall of the molding cavity. Because the streamline in the metal of the oral implant is usually cut off when the oral implant is machined by adopting a cutting mode at present, the strength of a product and the fatigue life in use can be influenced, as shown in figure 6, the molding cavity provided in the embodiment of the application is adopted to carry out plastic molding on the oral implant, the streamline of the metal of the oral implant is basically complete along the direction of the implant, and the oral implant produced by the plastic molding mode is obviously superior to the implant in the cutting mode in the strength and the fatigue life, as shown in figure 7; in addition, due to the adoption of a plastic forming method, the use of materials can be saved to the maximum extent, the production efficiency of products is improved by reducing processing links, and the production cost of the products is reduced to the maximum extent. And because the requirement of the plastic forming processing method on equipment is reduced, the equipment cost of a newly added production line can be reduced, and meanwhile, the consistency of the processed product is good through the plastic forming processing method, the processing cost of the product can be reduced in the aspect of improving the cost rate of the product.
In this embodiment, in order to be directed against the high temperature superplastic forming, can obtain more ideal shaping effect, the inside thermocouple that is provided with of shaping die for the temperature in the monitoring shaping intracavity when the shaping, the heating galvanic couple has been laid near the inner wall surface in the shaping die, for the blank heating or the heat preservation in shaping cavity and the shaping intracavity when the shaping, the surface of shaping die has the heat preservation.
Example 2
The embodiment of the application provides a method for manufacturing an oral implant through plastic processing of an oral implant mold, which comprises the following steps:
step 1: preparing a titanium or titanium alloy blank;
step 2: placing the blank in an oral implant die for extrusion molding, wherein the deformation rate is controlled at 10-2S-1-10- 4S-1；
And step 3: after the oral implant is extruded and formed, carrying out stress annealing and ultrasonic cleaning;
wherein, the inner wall of the molding concave die of the oral implant die is provided with a plurality of microscopic bulges, and the surface of the oral implant which is extruded and molded correspondingly has microscopic holes.
Conventionally, there are cold working (normal temperature forming) and hot working (a blank is required to be formed after heating or in a heat-retaining state) in general for a metal material. Aiming at pure titanium materials, the plasticity is good under normal conditions, the cold forming can be directly finished, and a die and a production process are designed according to the cold deformation processing process requirement of the conventional selected materials. The titanium alloy material such as TC4 is usually subjected to thermal deformation, particularly the titanium alloy material such as TC4 can show the superplasticity of the material at a specific temperature, the superplasticity of the material can be utilized, the molding and processing of the product are facilitated, taking TC4 as an example, the temperature of the general superplasticity is 900-950 ℃, and the deformation rate of the molding is controlled to be 10-4S-1-10-4S-1Within the range of (1), the deformation rate is preferably controlled to 10-4S-1(ii) a The total deformation of the extrusion molding of the blank is controlled to be more than 70 percent, and preferably to reach the elongation of more than 100 percent, thereby obtaining the ideal molding effect.
In the embodiment of the application, in order to ensure the superplastic performance of the material, the blank is heated to 900-950 ℃ for processing, or the blank is heated to 900-950 ℃ and is kept warm for 20-80 minutes for processing, meanwhile, in the extrusion forming process of the oral implant blank 2, the temperature inside the oral implant die is monitored, and the temperature inside the oral implant die is kept at 900-950 ℃, and by adopting the technical means, the ideal forming effect can be obtained to the maximum extent.
In the embodiment of the application, in order to better keep the temperature in the oral implant mold to be 900-950 ℃, thermocouples are arranged at different positions in the oral implant mold, and the thermocouples are used for monitoring the temperature in the oral implant mold or the temperature of the blank.
In the embodiment of the application, in order to better eliminate the stress of the oral implant finished product, the stress annealing temperature is 580-750 ℃, and the duration is 15-45 minutes.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (15)
1. A plastic forming die for preparing an oral implant, comprising:
a forming concave die for accommodating the oral implant blank (2);
the forming male die is used for extruding and processing the oral implant blank (2) in the forming female die and comprises a supporting seat (11), a connecting part (12) and a forming part (13) which are sequentially connected, wherein the connecting part (12) and the forming part (13) are used for extruding the blank to form a top groove of the oral implant;
the inner side wall of the forming concave die is provided with a plurality of microscopic bulges for forming microscopic holes on the outer surface of the oral implant.
2. The plastic molding die for manufacturing an oral implant according to claim 1, wherein the microscopic projections have a size of 20 to 40 micrometers and/or 2 to 4 micrometers.
3. The plastic forming die for making an oral implant according to claim 1, wherein the connecting portion (12) comprises a circular truncated cone (121) and a hexagonal prism (122), the circular truncated cone (121) is connected with the supporting base (11), and the hexagonal prism is connected with the forming portion (13);
the diameter of the section of the circular truncated cone (121) is larger than that of a circumscribed circle of the section of the hexagonal prism (122), and the diameter of the circumscribed circle of the section of the hexagonal prism (122) is larger than that of the forming part (13).
4. A plastic forming mold for making an oral implant according to claim 3, wherein the forming portion (13) is provided with a screw thread on the peripheral side thereof, and has a tapered structure at the bottom end thereof, the screw thread being used to form a mounting screw thread to the internal structure of the oral implant when the mold is closed, and the tapered structure being used to form a bottom taper hole to the bottom of the internal structure of the oral implant when the mold is closed.
5. The plastic forming mold for preparing an oral implant according to any one of claims 1 to 4, wherein the forming cavity is composed of a first forming cavity (3) and a second forming cavity (4), and the first forming cavity (3) and the second forming cavity (4) form a forming cavity for accommodating the blank when they are combined together; the microscopic bulge is arranged on the inner wall of the molding cavity.
6. The plastic forming mold for preparing an oral implant according to claim 5, wherein a thermocouple is provided inside the forming cavity for monitoring the temperature inside the forming cavity during the forming process;
and a heating couple is laid on the surface, close to the inner wall, in the forming cavity and used for heating or insulating the forming cavity and the blank in the forming cavity during forming.
7. The plastic forming mold for preparing an oral implant according to claim 6, wherein the outer surface of the forming cavity has an insulating layer.
8. A plastic molding method for preparing an oral implant, comprising the steps of:
step 1: preparing a titanium or titanium alloy blank;
step 2: placing the blank in an oral implant die for extrusion molding, wherein the deformation rate is controlled at 10-2S-1-10-4S-1；
And step 3: after the oral implant is extruded and formed, carrying out stress annealing and ultrasonic cleaning;
the inner wall of the forming concave die of the oral implant die is provided with a plurality of microscopic protrusions, and the surface of the oral implant which is formed by extrusion is correspondingly provided with microscopic holes.
9. The plastic molding method for manufacturing an oral implant according to claim 8, wherein the microscopic protrusions have a size of 20 to 40 microns and/or 2 to 4 microns, and the microscopic holes have a concavity of 20 to 40 microns and/or 2 to 4 microns.
10. The plastic forming method for manufacturing an oral implant according to claim 8, wherein the blank is a titanium alloy, and the step 2 further comprises heating the blank to 900-950 ℃.
11. The plastic forming method for preparing an oral implant according to claim 10, further comprising, before the step 2, maintaining the temperature of the blank after heating the blank to 900 ℃ to 950 ℃ for 20 minutes to 80 minutes.
12. The plastic molding method for manufacturing an oral implant according to claim 11, wherein the step 2 further comprises monitoring the temperature inside the oral implant mold during extrusion of the blank and maintaining the temperature inside the oral implant mold at 900 ℃ to 950 ℃.
13. The plastic molding method for manufacturing an oral implant according to claim 12, wherein the stress annealing temperature in step 3 is 580 ℃ -750 ℃ for 15-45 minutes.
14. The plastic molding method for manufacturing an oral implant according to claim 13, wherein the step 2 further comprises controlling the total deformation amount of the extrusion molding of the blank to be more than 70%.
15. The plastic molding method for manufacturing an oral implant according to claim 8, wherein the oral implant mold is the plastic molding mold for manufacturing an oral implant according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111323074.5A CN113751598B (en) | 2021-11-10 | 2021-11-10 | Plastic forming die and method for preparing oral implant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111323074.5A CN113751598B (en) | 2021-11-10 | 2021-11-10 | Plastic forming die and method for preparing oral implant |
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| CN113751598A true CN113751598A (en) | 2021-12-07 |
| CN113751598B CN113751598B (en) | 2022-03-04 |
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| DE102006044210A1 (en) * | 2006-09-15 | 2008-03-27 | Auriga Medical Products Gmbh | Tooth implant for anchoring e.g. crown, in patient`s jaw, has jamb with mold part cooperating with complementarily formed front side section in wall that surrounds retainer, and gold layer that is arranged between mold part and side section |
| CN201564626U (en) * | 2009-11-27 | 2010-09-01 | 江阴金泰克生物技术有限公司 | Instant-repair dental implant |
| CN102946821A (en) * | 2010-06-23 | 2013-02-27 | 李昊度 | Production device and production method for an implant using amorphous alloy |
| CN202960803U (en) * | 2012-12-17 | 2013-06-05 | 重庆润泽医药有限公司 | Once-implanted type dental implant |
| CN107280789A (en) * | 2016-04-12 | 2017-10-24 | 重庆润泽医药有限公司 | A kind of tooth implant |
| CN109044544A (en) * | 2018-08-31 | 2018-12-21 | 乌鲁木齐大为创新信息科技有限公司 | Dental implant |
| CN212699191U (en) * | 2020-04-24 | 2021-03-16 | 郑州康德泰口腔医疗科技有限公司 | Immediate implant |
| CN112754698A (en) * | 2021-01-08 | 2021-05-07 | 上海交通大学医学院附属第九人民医院 | Outer-layer gradient porous short implant for 3D printing and preparation method thereof |
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2021
- 2021-11-10 CN CN202111323074.5A patent/CN113751598B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080017665A (en) * | 2006-08-22 | 2008-02-27 | 세종대학교산학협력단 | Porous implant fixture with multiplicity shapes |
| DE102006044210A1 (en) * | 2006-09-15 | 2008-03-27 | Auriga Medical Products Gmbh | Tooth implant for anchoring e.g. crown, in patient`s jaw, has jamb with mold part cooperating with complementarily formed front side section in wall that surrounds retainer, and gold layer that is arranged between mold part and side section |
| CN201564626U (en) * | 2009-11-27 | 2010-09-01 | 江阴金泰克生物技术有限公司 | Instant-repair dental implant |
| CN102946821A (en) * | 2010-06-23 | 2013-02-27 | 李昊度 | Production device and production method for an implant using amorphous alloy |
| CN202960803U (en) * | 2012-12-17 | 2013-06-05 | 重庆润泽医药有限公司 | Once-implanted type dental implant |
| CN107280789A (en) * | 2016-04-12 | 2017-10-24 | 重庆润泽医药有限公司 | A kind of tooth implant |
| CN109044544A (en) * | 2018-08-31 | 2018-12-21 | 乌鲁木齐大为创新信息科技有限公司 | Dental implant |
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| CN112754698A (en) * | 2021-01-08 | 2021-05-07 | 上海交通大学医学院附属第九人民医院 | Outer-layer gradient porous short implant for 3D printing and preparation method thereof |
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| CN113751598B (en) | 2022-03-04 |
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Effective date of registration: 20220802 Address after: 230091 Hefei Economic and Technological Development Zone, Anhui Province, intersection of Qinghua road and Susong Road, Hefei Qidi science and Technology City, workstation 9, joint office area, floor 3, building C1, maker space Patentee after: Hefei boyamite dental materials Co.,Ltd. Address before: 307, floor 3, building 3, No. 538, yongfengtun, Haidian District, Beijing 100094 Patentee before: Beijing rongchuang Huizhi Technology Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 230601 Area 01, Building 5, Robot Industrial Base, Tusi Science and Technology City, at the intersection of Jinxiu Avenue and Susong Road, Hefei Economic and Technological Development Zone, Anhui Province Patentee after: Hefei Boya Maite Biomaterials Co.,Ltd. Address before: 230091 Hefei Economic and Technological Development Zone, Anhui Province, intersection of Qinghua road and Susong Road, Hefei Qidi science and Technology City, workstation 9, joint office area, floor 3, building C1, maker space Patentee before: Hefei boyamite dental materials Co.,Ltd. |