CN101284302B - Selective laser sintering indirect manufacturing method of individuation tongue side orthodontic bracket - Google Patents
Selective laser sintering indirect manufacturing method of individuation tongue side orthodontic bracket Download PDFInfo
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- CN101284302B CN101284302B CN2008100264907A CN200810026490A CN101284302B CN 101284302 B CN101284302 B CN 101284302B CN 2008100264907 A CN2008100264907 A CN 2008100264907A CN 200810026490 A CN200810026490 A CN 200810026490A CN 101284302 B CN101284302 B CN 101284302B
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Abstract
The invention provides a method for indirectly manufacturing an individualized lingual orthodontic bracket by selective laser sintering, which comprises the steps of measuring teeth data and obtaining outer structure parameters of the teeth; building a three dimensional CAD model of the teeth by reverse engineering and storing the same in a computer; designing the structural model (including designing a bottom plate through which the bracket is contacted with the surface of the teeth) for each bracket according to the orthodontic requirements, bracket manufacturing materials and the shape characteristics of the teeth; determining a trough of the bracket according to the ideal position in which the bracket can be placed; manufacturing an investment pattern required by the bracket according to the requirement of the structural model of the bracket and the investment casting by using the selective laser sintering rapid prototyping technology and adopting the layered manufacturing method; and manufacturing the metal bracket by adopting investment casting. The method has the advantages of saved procedure, time and cost, wide application range and diversified manufacturing materials. Furthermore, the method can realize customized manufacture with high precision according to individual difference, and the bracket can be better attached to the surfaces of the teeth.
Description
Technical field
The present invention relates to be used for the orthodontic bracket manufacturing technology of straightening of teeth, specifically be meant the selective laser sintering indirect manufacturing method of individuation tongue side orthodontic bracket.
Background technology
For irregular teeth arrangement is neat, just abnormal technology is extensively adopted in clinical practice.Common way be with bracket bonding at dental surface, the elasticity arch wire passes the groove of bracket and transmits corrective force.Since the seventies in 20th century, as a kind of orthodontic procedure attractive in appearance, the lingual orthodontic correcting technology has caused to be paid close attention to widely and payes attention to.The lingual orthodontic technology is bonded at tooth near a side of tongue with bracket, rather than a side of the close lip of lip side in just abnormal.The linguoplate groove is bonded at the tooth lingual surface, can not influence patient's social activities because of the sense of vision factor of bracket, also can not influence the closure of lip because of the sticking bracket of tooth labial surface.Simultaneously, the white dot that tooth lip side enamel has avoided decalcification to cause because of the effect of acid and alkali erosion agent, also more convenient doctor directly observes the position and the form of tooth in the therapeutic process from the lip side.
The bracket of lingual orthodontic employing at present is the universal product of standardized production, and for the tooth of individuality, appropriateness is smaller.Because the configuration of surface complexity of tongue side tooth generally adopts less bracket, so that bonding.The space of bracket and dental surface is filled up by bonding agent.If dental surface curvature changes greatly, the bonding agent that then needs is more, causes bracket base away from tooth surface, influences rectification effect.Therefore, than lip side bracket, the structural form of linguoplate groove obviously changes, and requires bracket and individual tooth to have higher matching.
The major defect of lingual orthodontic technology is the stimulation to tongue.Tongue is one of the most responsive organ of human body, also is one of organ of activity such as participate in pronunciation, swallow, and activity is very frequent.And the linguoplate groove has occupied the piecemeal activity space of tongue, can stimulate the edge of tongue to produce pain.In order to alleviate patient's burden, the bracket of making tiny precision becomes development trend.
The development and the maturation of rapid shaping technique (Rapid Prototyping is called for short RP) make it be penetrated into each industrial circle gradually, especially in mould is made, have risen fast mould manufacturing (Rapid Tooling is called for short RT) technology.Fast mould manufacturing technology integrated level height based on the RP technology, transfer process from the cad data to the physical entity is fast, thereby compares with traditional numerical-control processing method, has the moulding cycle weak point, characteristics such as the molding cost is low and lack die life, production has very strong adaptability to single and mini-batch production.Wherein, the method that adopts precinct laser sintering (Selective Laser Sintering is called for short SLS) fabrication techniques wax-pattern to cast again has been widely used in the manufacturing of metal parts.The material of making bracket is generally dentistry gold, titanium alloy, stainless steel and other metal materials, can make bracket by the method for model casting behind the employing precinct laser sintering technology forming model.
Existing linguoplate groove tank manufacturing method is a standardized production, can not satisfy patient's individual demand, thereby has influenced result of treatment and increased patient's burden.
Summary of the invention
Purpose of the present invention is exactly in order to solve above-mentioned the deficiencies in the prior art part, the selective laser sintering indirect manufacturing method of individuation tongue side orthodontic bracket is provided, this method can not only realize customizing and make according to individual difference, and accuracy of manufacture height, make the bracket tooth surface of can as far as possible fitting.
The present invention is achieved through the following technical solutions: the selective laser sintering indirect manufacturing method of this individuation tongue side orthodontic bracket may further comprise the steps:
(1) measures the dentition data, obtain the contour structures parameter of tooth;
(2) according to described dentition data, the method for employing reverse engineering (Reverse Engineering) is set up the three-dimensional CAD model of tooth and is stored in the computer;
(3), design the structural model of each bracket according to the shape facility of just abnormal requirement, bracket making material and tooth; The structural model design of described bracket comprises the base plate that the design bracket contacts with dental surface, and the groove of determining bracket according to the desirable placement location of each bracket;
(4) according to the structural model of bracket and the requirement of model casting, utilize rapid shaping technique, the method that adopts layering to make is made the required fusible pattern of bracket;
(5) adopt the method for model casting to produce bracket;
(6), the bracket after the moulding is done surface treatment according to clinical demand.
For realizing the present invention better, the measurement of described dentition data adopts CT tomoscan or non-contacting spatial digitizer directly to scan tooth, and the model of perhaps at first producing tooth carries out three-dimensional scanning measurement again, and described scanning accuracy is better than 0.02mm.
The storage format of the three-dimensional CAD model of the described tooth of step (2) is the STL form.
The described rapid shaping technique of step (4) comprises that (material of described fusible pattern can be selected paraffin or soluble polymer macromolecular material for use to precinct laser sintering for Selective Laser Sintering, SLS) technology.
The described layered manufacturing method of step (4) is meant based on discrete/accumulation principle, by computer the threedimensional model of fusible pattern of design is carried out hierarchy slicing, obtain the two-dimensional silhouette information of each layer cross section, according to the bracket model of described two-dimensional silhouette information, guarantee that the shape of each layer of bracket entity is consistent with the individual-layer data of bracket structure by PC control rapid forming equipment sinter molding wax.Because single bracket volume is less, so one-shot forming can be made a plurality of bracket fusible patterns that shape has nothing in common with each other.
Described lift height is 50～100 μ m, and the employing interlayer cumulative errors compensation way control accuracy of manufacture is 10～20 μ m.
Described investment casting method, its operation include crust, dewaxing, roasting and cast shelling, become clinical individual tongue-side bracket after polishing is revised.
The thickness of described bracket base is below the 0.4mm.The manufactured materials of described bracket comprises dentistry gold, titanium alloy, cochrome or stainless steel.
The present invention has following advantage and effect with respect to prior art:
1, personalized customization, manufacture method provided by the invention is not subjected to the restriction of part complexity, therefore the bonding base plate of bracket and dental surface does not adopt the standard network lattice structure, but customize design according to the shape facility of single tooth, can realize customizing according to individual demand and produce, the bracket precision height of preparation, thin thickness, the dentist designs the bracket base shape as required, the base plate shape can accurately be mated with dental surface, increased contact area, and because of the different thickness of the different choice of the selection of material; The groove position of each bracket, shape difference, the interface fit between groove and the arch wire is good, has reduced torsional error.To realize rectification effect preferably.
2, the manufacturing cycle weak point has been saved operation, time and cost.
3, applied widely, the present invention can directly make the orthodontic bracket of dentistry gold, stainless steel, titanium alloy, cochrome.
Description of drawings
Fig. 1 is the process chart of the selective laser sintering indirect manufacturing method of individuation tongue side orthodontic bracket of the present invention.
Fig. 2 is the single tooth three-dimensional CAD model of setting up according to the dentition data among the present invention.
Fig. 3 is according to the bracket structure chart of the architectural feature of single tooth shown in Figure 2 design among the present invention.
Fig. 4 is the structural representation of the base plate shape and the dental surface coupling of bracket shown in Figure 3.
Fig. 5 is that the present invention adopts the precinct laser sintering make-up machine to make the process schematic representation of personalized bracket.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
As shown in Figure 1, the technological process of the selective laser sintering indirect manufacturing method of individuation tongue side orthodontic bracket of the present invention is:
(1) measures the dentition data, obtain the contour structures parameter of tooth; The measurement of dentition data adopts CT tomoscan or non-contacting spatial digitizer directly to scan tooth, and the model of perhaps at first producing tooth carries out three-dimensional scanning measurement again, and described scanning accuracy is better than 0.02mm;
(2), adopt the three-dimensional CAD model of the method foundation tooth as shown in Figure 2 of reverse engineering, and be stored in the computer with the STL form according to described dentition data; The appearance structure of tooth is complicated, is generally irregular curved surface;
(3) as shown in Figure 3, according to the shape facility of just abnormal requirement, bracket making material and tooth, design the structural model of each bracket; The structural model design of described bracket comprises the base plate that the design bracket contacts with dental surface, and the groove of determining bracket according to the desirable placement location of each bracket; Fig. 4 is the curved surface of tooth and the bracket that designs according to the tooth curved surface features, and bracket 2 bottoms and tooth 1 tongue side surface fit together fully;
(4) according to the structural model of bracket and the requirement of model casting, utilize rapid shaping technique, the method that adopts layering to make is made the required fusible pattern of bracket; Promptly based on discrete/accumulation principle, by computer the threedimensional model of fusible pattern of design is carried out hierarchy slicing, obtain the two-dimensional silhouette information of each layer cross section, described lift height is 50～100 μ m, and the employing interlayer cumulative errors compensation way control accuracy of manufacture is 10～20 μ m; According to the bracket model of described two-dimensional silhouette information, guarantee that the shape of each layer is consistent with the individual-layer data of bracket structure by PC control rapid forming equipment sinter molding wax.
Wherein, as shown in Figure 5, the present invention adopts the technical process of the personalized bracket of precinct laser sintering make-up machine manufacturing to be:
At first set up the three-dimensional CAD model of tooth by measurement data, make the shape facility of material and tooth, design the structural model of single linguoplate groove by computer according to just abnormal requirement, bracket by reverse engineering; The bracket structural model is imported to moulding bracket fusible pattern in the precinct laser sintering for quick formation machine, and forming process can be decomposed into following three steps: the one, and utilize power spreading device will expect that the powder in the cylinder is layered on the working face of moulding cylinder equably; The 2nd, computer controlled controlling laser beam scans; The 3rd, bed thickness distance of piston decline of moulding cylinder, bed thickness distance of material cylinder piston rising.Above-mentioned three processes constantly repeat, up to machining.At last, from forming room, take out the bracket fusible pattern.Because single bracket volume is less, so one-shot forming can be made a plurality of bracket fusible patterns that shape has nothing in common with each other.
Because single bracket volume is less, so one-shot forming can be made a plurality of bracket molds that shape has nothing in common with each other.
(5) adopt the method for model casting to produce bracket; This investment casting method is traditional investment casting method, and operation includes crust, dewaxing, roasting and cast shelling, becomes clinical individual tongue-side bracket after polishing is revised.
(6), the bracket after the moulding is done surface treatment according to clinical demand.
The thickness of bracket base is below the 0.4mm.The manufactured materials of described bracket comprises dentistry gold, titanium alloy, cochrome, stainless steel.
By above step, can obtain the tongue side orthodontic bracket that customizes according to individual demand.
As mentioned above, just can realize the present invention preferably, the foregoing description is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; Be that all equalizations of doing according to content of the present invention change and modification, all contained by claim of the present invention scope required for protection.
Claims (6)
1. the selective laser sintering indirect manufacturing method of individuation tongue side orthodontic bracket is characterized in that may further comprise the steps:
(1) measures the dentition data, obtain the contour structures parameter of tooth;
(2) according to described dentition data, the method for employing reverse engineering is set up the three-dimensional CAD model of tooth and is stored in the computer;
(3), design the structural model of each bracket according to the shape facility of just abnormal requirement, bracket making material and tooth; The structural model design of described bracket comprises the base plate that the design bracket contacts with dental surface, and the groove of determining bracket according to the desirable placement location of each bracket;
(4) according to the structural model of bracket and the requirement of model casting, utilize the precinct laser sintering technology, the method that adopts layering to make is made the required fusible pattern of bracket; The method of described layering manufacturing is meant by computer carries out hierarchy slicing to the threedimensional model of fusible pattern of design, obtain the two-dimensional silhouette information of each layer cross section, according to the bracket model of described two-dimensional silhouette information by PC control rapid forming equipment sinter molding wax; Described lift height is 50～100 μ m, and the employing interlayer cumulative errors compensation way control accuracy of manufacture is 10～20 μ m; Described PC control rapid forming equipment is the precinct laser sintering make-up machine, and the technical process that adopts the precinct laser sintering make-up machine to make the bracket model is:
At first set up the three-dimensional CAD model of tooth by measurement data, make the shape facility of material and tooth, design the structural model of single linguoplate groove by computer according to just abnormal requirement, bracket by reverse engineering; The bracket structural model is imported to moulding bracket fusible pattern in the precinct laser sintering for quick formation machine, and forming process is decomposed into following three steps: the one, and utilize power spreading device will expect that the powder in the cylinder is layered on the working face of moulding cylinder equably; The 2nd, computer controlled controlling laser beam scans; The 3rd, bed thickness distance of piston decline of moulding cylinder, bed thickness distance of material cylinder piston rising, above-mentioned three processes constantly repeat, up to machining; At last, from forming room, take out the bracket fusible pattern;
(5) adopt the method for model casting to produce bracket;
(6), the bracket after the moulding is done surface treatment according to clinical demand.
2. according to the selective laser sintering indirect manufacturing method of the described individuation tongue side orthodontic bracket of claim 1, it is characterized in that: the measurement of described dentition data adopts CT tomoscan or non-contacting spatial digitizer directly to scan tooth, the model of perhaps at first producing tooth carries out three-dimensional scanning measurement again, and described scanning accuracy is better than 0.02mm.
3. according to the selective laser sintering indirect manufacturing method of the described individuation tongue side orthodontic bracket of claim 1, it is characterized in that: the storage format of the three-dimensional CAD model of the described tooth of step (2) is the STL form.
4. according to the selective laser sintering indirect manufacturing method of the described individuation tongue side orthodontic bracket of claim 1, it is characterized in that: described investment casting method, its operation includes crust, dewaxing, roasting and cast shelling, becomes clinical individual tongue-side bracket after polishing is revised.
5. according to the selective laser sintering indirect manufacturing method of the described individuation tongue side orthodontic bracket of claim 1, it is characterized in that: the thickness of described bracket base is below the 0.4mm.
6. according to the selective laser sintering indirect manufacturing method of the described individuation tongue side orthodontic bracket of claim 5, it is characterized in that: the bracket manufactured materials of described casting comprises dentistry gold, titanium alloy, cochrome or stainless steel.
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| CN2008100264907A CN101284302B (en) | 2008-02-27 | 2008-02-27 | Selective laser sintering indirect manufacturing method of individuation tongue side orthodontic bracket |
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| CN2008100264907A CN101284302B (en) | 2008-02-27 | 2008-02-27 | Selective laser sintering indirect manufacturing method of individuation tongue side orthodontic bracket |
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| CN101647729B (en) * | 2009-09-11 | 2012-11-14 | 广州瑞通生物科技有限公司 | Manufacture method of individual orthodontic appliance for tongue |
| CN101991465B (en) * | 2010-09-10 | 2012-09-26 | 广州瑞通生物科技有限公司 | Manufacturing method of positioning tray and bracket with positioning hook used for manufacturing positioning tray |
| CN102113916B (en) * | 2011-01-18 | 2013-05-08 | 叶年嵩 | Method for making personalized bracket |
| EP3906870B1 (en) | 2011-02-18 | 2023-07-26 | 3M Innovative Properties Company | Computer-implemented method of simulating a collision between two virtual teeth |
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| CN102814590B (en) * | 2012-07-21 | 2014-07-30 | 北京工业大学 | Method for removing adhesive on bottom plate of orthodontic bracket by laser |
| EP2837356A1 (en) | 2013-08-14 | 2015-02-18 | 3M Innovative Properties Company | An orthodontic bracket and a method of making an orthodontic bracket |
| CN104084582A (en) * | 2014-07-23 | 2014-10-08 | 上海上远齿科技术有限公司 | False tooth support prepared from metal powder through laser casting and preparation method of false tooth support |
| CN104605950A (en) * | 2014-11-25 | 2015-05-13 | 深圳市康泰健牙科器材有限公司 | Digital impression support making method and system thereof |
| CN104398308A (en) * | 2014-12-17 | 2015-03-11 | 上海正雅齿科科技有限公司 | Method for machining individual bracket |
| CN104688362B (en) * | 2015-03-18 | 2016-11-09 | 西安交通大学口腔医院 | A kind of have straightening of teeth and the appliance and preparation method thereof promoting mandibular growth effect concurrently |
| CN105030349B (en) * | 2015-06-30 | 2017-10-17 | 叶年嵩 | A kind of preparation method of individual tongue-side straight arch wire self-ligating brackets |
| CN105055035B (en) * | 2015-07-01 | 2018-08-31 | 广州中国科学院先进技术研究所 | Pure titanium orthodontic bracket based on selective laser melting technology and manufacturing method |
| CN105436406A (en) * | 2015-12-01 | 2016-03-30 | 华中科技大学无锡研究院 | Precision lost wax casting technology based on selective laser powder sintering 3D printing |
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| CN109259877A (en) * | 2018-11-30 | 2019-01-25 | 广州牙道医疗器械有限公司 | A kind of digitlization customized production technique of dental product |
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