CN107900332A - Dentistry plants the 3D printing method of stent - Google Patents
Dentistry plants the 3D printing method of stent Download PDFInfo
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- CN107900332A CN107900332A CN201711130905.0A CN201711130905A CN107900332A CN 107900332 A CN107900332 A CN 107900332A CN 201711130905 A CN201711130905 A CN 201711130905A CN 107900332 A CN107900332 A CN 107900332A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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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
- B22F10/36—Process control of energy beam parameters
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- 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
- B22F10/80—Data acquisition or data processing
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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
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
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- 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
- 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
- B22F10/32—Process control of the atmosphere, e.g. composition or pressure in a building chamber
- B22F10/322—Process control of the atmosphere, e.g. composition or pressure in a building chamber of the gas flow, e.g. rate or direction
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B22F10/64—Treatment of workpieces or articles after build-up by thermal means
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Abstract
The present invention relates to the 3D printing method of dentistry plantation stent, include 3-D scanning, three dimensional design, data processing, 3D printing and part post processing, blue light is first passed through in 3-D scanning to scan to obtain the global shape of threedimensional model, fine scanning is carried out to the interface section for planting stent by probe scanning again, and do not include car pin in three dimensional design to compensate, in data processing, the interface that dentistry plantation stent is connected with planting body, interface internal and the smooth surface texture that egress edge is no additional support.The 3D printing method of the dentistry plantation stent of the present invention, the formed precision of dentistry plantation stent can be increased substantially, and plantation stent is set to conform better to demand in detail section, it also simplify the forming process of selective laser fusing, the fabrication cycle of plantation stent has been obtained great shortening, effectively increase shaping efficiency.
Description
Technical field
The present invention relates to 3D printing method, is concretely the 3D printing method that dentistry plants stent.
Background technology
Dentistry implant operation is that current tooth body lacks most effective repair mode, in the top knot that planting body and plantation are repaired
Connection between structure needs to coordinate accurate plantation stent to be repaired.Since cochrome and titanium alloy material are in intensity, hard
There is excellent mechanical property in terms of degree, wearability and toughness, therefore be widely used in dentures repai field, wherein locally
Plantation stent and full mouth plantation stent are current most common metal artificial tooth implanting brackets.
The processing method of currently used dental metal plantation stent is machine cut method, but this molding mode takes
Length, utilization rate of raw materials are low, and are short of in precision aspect.The precision of car pin cutting at present can reach 60 μm of ranks, and
Dentistry plantation stent accuracy and quality can because cutting car pin loss be lower, in working angles car pin cutting less than place
It can not be molded, adjacent local precision is bad, makes accurate not being bonded between base station and planting body, base station and upper prosthesis,
Influence precision and the overall quality of plantation reparation.
It is titanium alloy to plant the most common metal of stent, and titanium alloy problems with easily occurs in working angles：Titanium closes
Golden hardness is excessive to be caused to be difficult to cut, and is less than plus titanium alloy deformation coefficient or close to 1, is usually aggravated tool wear.Meanwhile by
It is small in the elasticity modulus of titanium alloy, flexural deformation is easily produced under radial load effect during processing, causes vibration, is increased cutter and is ground
Damage and influence the precision of part.Since the chemism of titanium is big, under high cutting temperature, it is easy to absorb oxygen in air and
Nitrogen forms hard and crisp crust；The plastic deformation in working angles will also result in Surface hardened layer at the same time.What therefore cutting manufactured adds
Unsuitable progress high-performance, automatic quickly make plant stent to work method.
3D printing is the nickname of increasing material manufacturing, it is by Reconstruction Design three-dimensional digitalization model, using metal dust successively
Accumulation principle manufactures entity component, allows whole manufacturing process to be truly realized intelligent with digitizing.Selective laser fusing is should
With widest selective laser smelting technology, it is a kind of technology based on laser fusion metal dust, collection laser technology, numeral
Intelligent control technology, CAD analysis, rapid shaping in one, can directly manufacture metallurgical binding, dense structure,
The high metal parts of good mechanical properties, precision.
It is excellent that selective laser smelting technology has that personalization level is high, process is simple, fabrication cycle is short, stock utilization is high etc.
Point, can meet that oral restoration is personalized, complicates, highly difficult technical requirements, while make up the deficiencies in the prior art, it is not necessary to
Worry again because a variety of influences that cutting temperature is brought.Therefore selective laser fusing has more and more been applied to oral cavity and has repaiied
Among the manufacture of complex, become the indispensable emerging technology of oral cavity Digital manufacturing.
But selective laser is melted in when processing metal material, because the moulding mechanism of shock heating quenching, plantation stent is adding
Thermal stress is big during work, is easily deformed；The plantation stent of processing with the addition of after support carries out 3D printing, expense is compared in post processing
When, and the precision with the interface of planting body is easily influenced, therefore use the melt-processed metal implants stent difficulty in selective laser
It is very big.Due to usually requiring that precision is not high using the part of selective laser fusing at present, the part side after disposable laser scanning
The unsmooth structures such as edge is jagged, this is also not allow in dentistry plants stent.
The content of the invention
The present invention provides a kind of 3D printing method of dentistry plantation stent, improves the formed precision that dentistry plants stent,
And simplify the moulding process of selective laser fusing.
The 3D printing method of the dentistry plantation stent of the present invention, includes 3-D scanning, three dimensional design, data processing, 3D
Printing and part post processing, blue light is first passed through in 3-D scanning and scans to obtain the global shape of threedimensional model, then passes through probe
Scan and fine scanning is carried out to the interface section for planting stent, and the compensation of car pin is not provided with three dimensional design, at data
During reason, dentistry plants the interface that stent is connected with planting body, and interface internal is the smooth of no supporting item with egress edge
Surface texture.
A kind of optional mode is, when being put in the position of data processing, the major axis of threedimensional model and the trunnion axis of substrate
Angle is 30 °~60 °.
Preferably, the trunnion axis angle of the major axis of the threedimensional model and substrate is 45 °.
Further, benchmark is used as to three by the egress edge of threedimensional model and the Geometry edge of base station in three dimensional design
Interface position in dimension module is positioned, and the precision between designed threedimensional model and base station is coincide.
Further, after the completion of three dimensional design when threedimensional model is exported, all housings included in threedimensional model
Merge, the action of threedimensional model intermediate cam dough sheet is then set below 0.1mm, ensures the precision of threedimensional model.
Further, in 3D printing, laser scanning twice is at least carried out to the interface by selective laser fusing.
Optionally, it is first the low of 0.1~0.3J/mm with linear energy density to the interface in the laser scanning
Linear energy density laser carry out 4~6 multiple scannings after, then with linear energy density control 0.5~1J/mm high line energy
Metric density laser carries out fine and close remelting.
On this basis, in 3D printing, to local plantation stent using orthogonal continuous scanning, stent is planted to full mouth, is adopted
With checkerboard type subarea-scanning, to supporting moulding section, scanned using interlayer.
The 3D printing method of the dentistry plantation stent of the present invention, can increase substantially the shaping essence of dentistry plantation stent
Degree, and plantation stent is conformed better to demand in detail section, the forming process of selective laser fusing is also simplify,
The fabrication cycle of plantation stent has been obtained great shortening, effectively increase shaping efficiency.
Embodiment with reference to embodiments, is described in further detail the above of the present invention again.
But the scope that this should not be interpreted as to the above-mentioned theme of the present invention is only limitted to following example.Think not departing from the above-mentioned technology of the present invention
In the case of thinking, the various replacements or change made according to ordinary skill knowledge and customary means, should all be included in this hair
In bright scope.
Brief description of the drawings
Fig. 1 is the flow chart for the 3D printing method that dentistry of the present invention plants stent.
Fig. 2 is the schematic diagram that threedimensional model position is put.
Embodiment
The 3D printing method of dentistry of the present invention plantation stent, includes 3-D scanning, three dimensional design, data processing, 3D are beaten
Print and part post processing.Wherein 3-D scanning is the first step of dentistry Digital manufacturing, and patient can be obtained by 3-D scanning
Oral condition.The 3-D scanning of dentistry is divided into two major classes of scanning, the present invention in plaster cast scanning and patient mouthful and uses gypsum
The mode of model scanning.The process of plaster cast scanning is to produce out print out of patient mouthful using rapidly solidified materials such as silicon rubber
After mould, plaster cast is poured out by this stamp, then go out the three-dimensional profile of the plaster cast using scanner scanning.The stage
Scanning accuracy will directly determine the formed precision of whole work flow.Therefore it is first in 3-D scanning in order to lift scanning accuracy
Scan to obtain the global shape of threedimensional model by blue light, then the interface section for planting stent is carried out finely by probe scanning
Scanning, it is achieved thereby that the scanning of each tiny characteristics reappears, scanning accuracy can reach within 2 μm so that final design
Plantation stent can conform better to disease Man's Demands in detail section.Although blue light scans and probe scanning is existing skill
Art, but in traditional dentistry plantation stent 3D printing technique, can only use one of which scan mode as needed, and this hair
It is bright according to different positions and to need two kinds of scan modes being used in combination, the scanning essence to entirety and details is greatly improved
Degree, lays a good foundation for final high-precision printout.
Three dimensional design is that the oral cavity three-dimensional data of scanning is imported into the dentistry design software such as 3shape or EXOcad, root
The design of plantation stent is carried out according to plantation body position, reparation shape and planting body size.The thickness of hat and stent is minimum can be with
Reach 0.15mm, realize lightweight, and the compensation of car pin is not provided with three dimensional design, it is numerous and diverse time-consuming to eliminate the cutting of car pin
Process, the fabrication cycle of plantation stent has been obtained great shortening.The wherein described car pin compensation is in design software
One default value.In the dentistry plantation stent of conventionally employed machining shaping, in order to make up because diameter of car pin itself is big
It is small and caused by precision deficiency, can make preferably closely sealed with abutment at this in the more of the accurate place cutting such as cut end.And
It is not related to car pin in 3D printing, but still habitually will be into driving pin compensation usually in three dimensional design, and this can be influenced
The precision of final molding, therefore the present invention cancels the option, is improved the precision of 3D printing, while also ensure that design
The integrality of planting matrix bridge.The shape of dummy is first designed according to actual conditions in three dimensional design, is then set by switchback
Suitable plantation stent is counted out, to be that the dummy on top reserves the sufficient space of 1.5~3.0mm when Ji Qiao is designed.Pass through
The egress edge of threedimensional model and the Geometry edge of base station position the interface position in threedimensional model as benchmark, make to set
Precision between the threedimensional model and base station counted is coincide.When exporting as STL forms, the housing of all designs is merged, then
Set the tri patch action of STL to be less than 0.1mm, ensure the precision of threedimensional model in stl file.
Data processing is in data processing software, and data inspection and reparation, position are carried out to designed threedimensional model
Put, support addition and cut into slices and etc..In wherein being put in position, it is pair while the three-dimensional mould of multiple stl files of printing
Type typesetting and put, therefore, to assure that contact is occurred without between each threedimensional model, apart from border at least 10mm, each other away from
From>1mm.Position is as small as possible for principle with supporting surface height as few and vertical direction as possible when putting, to improve shaping
Efficiency.When position is put, the major axis of threedimensional model and the trunnion axis angle of substrate are about 45 °, can so strengthen powdering mistake
Cheng Zhong, ability of the plantation stent confrontation from scraper lateral force printed, makes the forming process of plantation stent more stable.
Part is added in the support of data processing, it is desirable to is guaranteeing the same of the printed plantation stent of firmly support
When, also to make to easily remove after plantation rack forming.Plant interface section with planting body in stent, cancel in interface and
The supporting item of egress edge, makes interface internal be the smooth surface texture of no additional support with egress edge, and passes through increasing
The density of adjunction mouth surrounding supports makes interface obtain good support, ensures interface Forming Quality.
In 3D printing, printed using selective laser melting process.In order to which printing effect is more preferable, printing is improved
The precision of part, in laser scanning, laser scanning twice is at least carried out to the position of interface makes the metal dust at this completely molten
Change, and make interface surface smooth, increase substantially the precision of interface.The laser energy scanned every time can be identical,
Can be different, such as the low linear energy density laser that linear energy density is 0.1~0.3J/mm can be first used to the position of scanning
After carrying out 4~6 multiple scannings, then caused in the high linear energy density laser of 0.5~1J/mm with linear energy density control
Close remelting.To local plantation stent using orthogonal continuous scanning, stent is planted to full mouth, using checkerboard type subarea-scanning, to branch
Moulding section is supportted, is scanned using interlayer.Set a diameter of 40~100 μm of laser focus on light beam, laser power 100~
300W, sweep speed is in 700~2000mm/s, 0.1~0.16mm of sweep span.
After 3D printing is molded, the lifting of plantation stent comprehensive performance is realized by post-processing.
Embodiment 1：
The present embodiment is exemplified by preparing the full mouth plantation stent of titanium alloy.
The 3D printing method of dentistry plantation stent of the present invention as shown in Figure 1, includes：
3-D scanning：After producing out stamp out of patient mouthful by silicon rubber, plaster cast is poured out by this stamp.For
Lifting scanning accuracy, by the way of blue light scanning technique and probe scanning technology are combined, first using 3shape blue lights
The shape of scanner scanning model, obtains the global pattern of threedimensional model, then using Nobel probe-types scanner to planting stent
Interface section carry out fine scanning, realize for bead, each tiny characteristics of planting body interface scanning reappear, finally sweep
Can be reached by retouching precision by 2 μm.
Three dimensional design：After having obtained the three-dimensional data of patient's cavity interior, oral cavity three-dimensional data is imported into EXOcad
In dentistry design software, the design of plantation stent is carried out according to plantation shape and reparation shape and the axial direction of the two.Root
According to thickness and patient tolerability of the plantation stent in mouth, the thickness of hat and stent is 0.5mm, both ensure that intensity, at the same time
Also comply with light-weight design.The compensation of car pin is not provided with during being designed.Needed in design process confirm tapping with
The scope of the boundary line of base station interface butted part, to ensure that later stage 3D printing can be carried out accurately.
After dentistry plantation stent completes three dimensional design, the STL formatted files comprising three-dimensional modeling data are exported as.Then
The housing of all designs in threedimensional model is merged, sets the tri patch action of threedimensional model in STL to be less than 0.1mm, is ensured
The precision of threedimensional model.
Data processing：After the completion of three dimensional design, the file of the STL forms of plantation stent is obtained, the STL texts of stent will be planted
Part is imported into magics data processing softwares, carries out data inspection and reparation, position are put, support is added, are cut into slices and scanned
Strategic planning and etc..
Wherein described data inspection and reparation part, are to check the threedimensional model in three-dimensional S TL files whether there is hole, bad selvedge
The defects of, find that defect needs to be repaired if checking, it is ensured that the threedimensional model in stl file is complete and closing a shell
Body.
Part is put in position, is pair while multiple stl files of printing carries out typesetting and put, therefore, to assure that each three-dimensional
Contact is occurred without between model, apart from border at least 10mm, distance each other>1mm.As shown in Fig. 2, position will be with when putting
Supporting surface height as few and vertical direction as possible as small as possible is principle, to improve molding efficiency.When position is put, make to add
The major axis of the threedimensional model 2 of work and the trunnion axis angle α of substrate 1 are about 45 °, can so strengthen the lateral force resistance of plantation stent
Ability, make formed precision higher, and in printing, the powdering scraper 3 of printing equipment is flutterred with direction of arrow movement
It during powder, can be contacted respectively with threedimensional model 2 with diverse location in face powder scraper 3, avoid the repetition of same position from contacting and cause
Wear it is unbalanced at the same time, also at utmost reduce the resistance of threedimensional model 2 being subject to when face powder scraper 3 is run.
When supporting addition, also to be easily removed while firmly support plantation stent is being guaranteed after shaping
Support.For different types of scraper in 3D printing device, can select to design corresponding supporting type.What the present embodiment used
It is rigid scraper, the support of addition is massive support.The interface section with planting body in stent is planted, eliminates in interface and connects
The supporting item at mouth edge, makes interface internal be the smooth surface texture of no additional support with egress edge, and pass through increase
The density of interface surrounding supports makes interface obtain good support, ensure that the Forming Quality of interface.
The sliced section is that by section the threedimensional model in stl file is obtained piece layer data, in the present embodiment
Piece thickness is arranged to 30 μm.
Scanning strategy planning part is the scan method for planning each lamella, determines the spacing distance between scan line
With the offset distance of contour line.In the present embodiment, using orthogonal continuous scanning strategy.
3D printing：After the completion of data processing, which is imported into the 3D printing equipment of selective laser fusing, be printed as
Type.Raw material is printed using micron-size spherical metal dust as material.Laser is by scanning each layer being melted and molded on substrate
The powder of cross section, then be layering as a plantation stent.The diameter of the laser focus on light beam of 3D printing equipment is set
For 80 μm, laser power is arranged to 120W, and the control accuracy of lead screw motor is within 1 μm.The exposure of printing plantation internal stent
Parameter is：Sweep span 0.14mm, speed 1200mm/s, intensity 270W, bias compensation 0.08mm, width of fringe 5mm, spring layer are swept
Retouch, rotate；Printing plantation frame upper exposure parameter be：Distance 0.14mm, speed 1300mm/s, intensity 300W, thickness
0.06mm；It is slightly weak compared with exposed parameter to plant the exposure parameter of stent lower part, has lowered in speed and exposure intensity, purport
Shorten the time in the case where ensureing Forming Quality, improve efficiency.
The Ti6Al4V Titanium Powders powder material of selection is produced using plasma atomizing type, and sphericity is more than 90%, powder
Last particle size range is 15~45 μm, and powder Hall flow data are less than 40s/50g, oxygen content in power 1000ppm.
Select TC4 (Ti6Al4V) to be used as baseplate material, make to have good wetability between moulding material and substrate, protect
It is firmly bonded, will not cracks between card substrate and part.
In forming process, according to material and the difference of thickness, adjust laser power, sweep speed of 3D printing equipment etc. into
Type technique, it is ensured that laser beam can be completely melt metal dust, form the molten road of a continuously smooth.Powder is printed in order to prevent
Aoxidize, printing powder is protected using nitrogen in forming process, nitrogen pressure 5bar in fusion process.In order to
The flue dust for preventing from producing in forming process pollutes printing powder, and smoke dust filter is provided with 3D printing equipment.
Part post-processes：, it is necessary to be post-processed after 3D printing is molded, the lifting of part comprehensive performance is realized.By
In selective laser, fusing is the forming process of a shock heating quenching, therefore internal stent can there are residual stress for molding plantation.
Deform in order to prevent, need molded part being put into togerther in the Muffle furnace of atmosphere protection together with substrate before being cut, carry out
Annealing heat-treats, remove the residual stress of plantation internal stent.
Processing procedure is：800 DEG C are warming up to from room temperature by two and one-half- hours in Muffle furnace, then keeps the temperature two hours,
Then 380 DEG C are naturally cooled to, whole process is protected using argon gas, and argon flow amount is controlled in 0.5m3/h。
After annealing is completed, it is possible to plantation stent is cut down from substrate, then removes support, then to table
Face carry out sandblasting and sanding and polishing etc. processing, print interface after being completed by post-processing fit closely it is seamless,
Molding effect is good.All-round property testing is as shown in table 1, and compared to machine cut technology, the present invention uses technology acuracy higher,
Mechanical property is more excellent, and Metal ion release amount is less in the mouth of dummy, to the security risk smaller of patient.
Table 1：
| Parameter | The method of the present embodiment | Machine cut |
| Material | Ti6Al4V spherical powders | Ti6Al4V circular cut disks |
| Precision | Error is below 20 μm | Generally at 60~120 μm |
| Tensile strength | 1100Mpa | 780Mpa |
| Yield strength | 1050Mpa | 580Mpa |
| Elongation after fracture | >10% | 5%~7% |
| Metal ion release amount in mouthful | Less than 1 μ g./cm3 | 10μg./cm3 |
Embodiment 2：
The present embodiment is used as example to prepare the full mouth plantation stent of pure titanium.
The 3D printing method of dentistry plantation stent of the present invention as shown in Figure 1, includes：
3-D scanning：After producing out stamp out of patient mouthful by silicon rubber, plaster cast is poured out by this stamp.For
Lifting scanning accuracy, by the way of blue light scanning technique and probe scanning technology are combined, first using 3shape blue lights
The shape of scanner scanning model, obtains the global pattern of threedimensional model, then using Nobel probe-types scanner to planting stent
Interface section carry out fine scanning, realize for bead, each tiny characteristics of planting body interface scanning reappear, finally sweep
Can be reached by retouching precision by 2 μm.
Three dimensional design：After having obtained the three-dimensional data of patient's cavity interior, oral cavity three-dimensional data is imported into EXOcad
In dentistry design software, the design of plantation stent is carried out according to plantation body position, reparation shape and planting body size.According to kind
Thickness and patient tolerability of the stent in mouth are planted, the thickness of hat and stent is 0.05mm, both ensure that intensity, while also accord with
Close light-weight design.The compensation of car pin is not provided with during being designed.Need to confirm tapping and base station in design process
The scope of the boundary line of interface butted part, to ensure that later stage 3D printing can be carried out accurately.
After dentistry plantation stent completes three dimensional design, the STL formatted files comprising three-dimensional modeling data are exported as.Then
The housing of all designs in threedimensional model is merged, sets the tri patch action of threedimensional model in STL to be less than 0.1mm, is ensured
The precision of threedimensional model.
Data processing：After the completion of three dimensional design, the file of the STL forms of plantation stent is obtained, the STL texts of stent will be planted
Part is imported into magics data processing softwares, carries out data inspection and reparation, position are put, support is added, are cut into slices and scanned
Strategic planning and etc..
Wherein described data inspection and reparation part, are to check the threedimensional model in three-dimensional S TL files whether there is hole, bad selvedge
The defects of, find that defect needs to be repaired if checking, it is ensured that the threedimensional model in stl file is complete and closing a shell
Body.
Part is put in position, is pair while multiple stl files of printing carries out typesetting and put, therefore, to assure that each three-dimensional
Contact is occurred without between model, apart from border at least 10mm, distance each other>1mm.As shown in Fig. 2, position will be with when putting
Supporting surface height as few and vertical direction as possible as small as possible is principle, to improve molding efficiency.When position is put, make to add
The major axis of the threedimensional model of work and the trunnion axis angle of substrate are about 45 °, can so strengthen the lateral force resistance of plantation stent
Ability, makes formed precision higher.
When supporting addition, also to be easily removed while firmly support plantation stent is being guaranteed after shaping
Support.For different types of scraper in 3D printing device, can select to design corresponding supporting type.What the present embodiment used
It is rigid scraper, the support of addition is massive support.The interface section with planting body in stent is planted, eliminates in interface and connects
The supporting item at mouth edge, makes interface internal be the smooth surface texture of no additional support with egress edge, and pass through increase
The density of interface surrounding supports makes interface obtain good support, ensure that the Forming Quality of interface.
The sliced section is that by section the threedimensional model in stl file is obtained piece layer data, in the present embodiment
Piece thickness is arranged to 30 μm.
Scanning strategy planning part is the scan method for planning each lamella, determines the spacing distance between scan line
With the offset distance of contour line.In the present embodiment, checkerboard type subarea-scanning strategy, to reduce the thermal stress in forming process, prevents
Only deform.
3D printing：After the completion of data processing, which is imported into the 3D printing equipment of selective laser fusing, be printed as
Type.Raw material is printed using micron-size spherical metal dust as material.Laser is by scanning each layer being melted and molded on substrate
The powder of cross section, then be layering as a plantation stent.The diameter of the laser focus on light beam of 3D printing equipment is set
For 80 μm, laser power is arranged to 120W, and the control accuracy of lead screw motor is within 1 μm.The exposure of printing plantation internal stent
Parameter is：Sweep span 0.14mm, speed 1500mm/s, intensity 290W, bias compensation 0.08mm, width of fringe 5mm, spring layer are swept
Retouch, rotate；Printing plantation frame upper exposure parameter be：Distance 0.14mm, speed 1500mm/s, intensity 300W, thickness
0.03mm；It is slightly weak compared with exposed parameter to plant the exposure parameter of stent lower part, has lowered in speed and exposure intensity, purport
Shorten the time in the case where ensureing Forming Quality, improve efficiency.
The pure titanium valve powder material selected, is produced, sphericity is more than 90%, powder diameter model using plasma atomizing type
Enclose for 15~45 μm, powder Hall flow data are less than 40s/50g, oxygen content in power 1200ppm.
Select TC4 (Ti6Al4V) to be used as baseplate material, make to have good wetability between moulding material and substrate, protect
It is firmly bonded, will not cracks between card substrate and part.
In forming process, according to material and the difference of thickness, adjust laser power, sweep speed of 3D printing equipment etc. into
Type technique, it is ensured that laser beam can be completely melt metal dust, form the molten road of a continuously smooth.Powder is printed in order to prevent
Aoxidize, printing powder is protected using nitrogen in forming process, nitrogen pressure 5bar in fusion process.In order to
The flue dust for preventing from producing in forming process pollutes printing powder, and smoke dust filter is provided with 3D printing equipment.
Part post-processes：, it is necessary to be post-processed after 3D printing is molded, the lifting of part comprehensive performance is realized.By
In selective laser, fusing is the forming process of a shock heating quenching, therefore internal stent can there are residual stress for molding plantation.
Deform in order to prevent, need molded part being put into togerther in the Muffle furnace of atmosphere protection together with substrate before being cut, carry out
Annealing heat-treats, remove the residual stress of plantation internal stent.
Processing procedure is：800 DEG C are warming up to from room temperature by two and one-half- hours in Muffle furnace, it is small then to keep the temperature 1~2
When, 380 DEG C are then naturally cooled to, whole process is protected using argon gas, and argon flow amount is controlled in 0.6m3/h。
After annealing is completed, it is possible to plantation stent is cut down from substrate, then removes support, then to table
Face carries out the processing such as sandblasting and sanding and polishing, obtains the full mouth plantation stent of pure titanium.
Claims (8)
1. dentistry plants the 3D printing method of stent, include 3-D scanning, three dimensional design, data processing, 3D printing and part
Post processing, it is characterized in that：Blue light is first passed through in 3-D scanning to scan to obtain the global shape of threedimensional model, then is swept by probe
Retouch and fine scanning is carried out to the interface section for planting stent, and do not include car pin in three dimensional design and compensate, in data processing
When, dentistry plants the interface that stent is connected with planting body, and interface internal is the flat of no additional support with egress edge
Sliding surface texture.
2. the 3D printing method of dentistry plantation stent as claimed in claim 1, it is characterized in that：Put in the position of data processing
When, the major axis of threedimensional model (2) is 30 °~60 ° with the trunnion axis angle (α) of substrate (1).
3. the 3D printing method of dentistry plantation stent as claimed in claim 1, it is characterized in that：Pass through three-dimensional mould in three dimensional design
The egress edge of type and the Geometry edge of base station position the interface position in threedimensional model as benchmark, make designed
Precision between threedimensional model and base station is coincide.
4. the 3D printing method of dentistry plantation stent as claimed in claim 1, it is characterized in that：When threedimensional model is exported,
All housings in threedimensional model merge, and then set the action of the tri patch of threedimensional model to be less than 0.1mm, ensure three
The precision of dimension module.
5. the 3D printing method of dentistry plantation stent as claimed in claim 1, it is characterized in that：The major axis of the threedimensional model with
The trunnion axis angle of substrate is 45 °.
6. the 3D printing method of dentistry plantation stent as claimed in claim 1, it is characterized in that：Melted by selective laser to institute
State interface and at least carry out laser scanning twice.
7. the 3D printing method of dentistry plantation stent as claimed in claim 6, it is characterized in that：In laser scanning, to described
After interface first carries out 4~6 multiple scannings with the low linear energy density laser that linear energy density is 0.1~0.3J/mm, then use
Linear energy density controls the high linear energy density laser in 0.5~1J/mm to carry out fine and close remelting.
8. the 3D printing method of dentistry plantation stent as claimed in claim 1, it is characterized in that：In 3D printing, to local plantation
Stent plants stent using orthogonal continuous scanning to full mouth, using checkerboard type subarea-scanning, to supporting moulding section, using every
Layer scanning.
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| CN201711130905.0A CN107900332B (en) | 2017-11-15 | 2017-11-15 | Dentistry plants the 3D printing method of holder |
| PCT/CN2018/087871 WO2019095660A1 (en) | 2017-11-15 | 2018-05-22 | 3d printing method for dental implant abutment |
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| CN201711130905.0A CN107900332B (en) | 2017-11-15 | 2017-11-15 | Dentistry plants the 3D printing method of holder |
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| WO2019095660A1 (en) | 2019-05-23 |
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Effective date of registration: 20181107 Address after: 610207 second, Tengfei two road 355 Economic Development Zone, Shuangliu District, Chengdu, Sichuan Patentee after: Chengdu Dent Dental Technology Development Co., Ltd. Address before: 610000 9 A 1 block, No. 1, two South Road, Keyuan garden, Chengdu hi tech Zone, Sichuan. Patentee before: Chengdu excellent technology Co., Ltd. |