CN103405276B - The digitized manufacturing system method of Tooth orthodontic correction device and fixed appliance thereof - Google Patents
The digitized manufacturing system method of Tooth orthodontic correction device and fixed appliance thereof Download PDFInfo
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- CN103405276B CN103405276B CN201310289989.8A CN201310289989A CN103405276B CN 103405276 B CN103405276 B CN 103405276B CN 201310289989 A CN201310289989 A CN 201310289989A CN 103405276 B CN103405276 B CN 103405276B
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Abstract
The digitized manufacturing system method of Tooth orthodontic correction device, comprises CT data acquisition and mouth interscan; Oral cavity tissue reconstructing three-dimensional model obtains skeleton and tooth; Mouth interscan data reconstruction obtains gingiva and accurate tooth; Composite model is obtained after two model composition; Calculate the key parameters such as the Tooth Movement amount that comprises, required correction force and moment, afterburning mode, and discharge the target dentition after treatment; Accurately calculate the mode of every Tooth movement and displacement or angle, and calculate required force and moment; Calculate the shape and size parameter of required SMP force application mechanism, and then design forcing unit; According to the threedimensional model of every tooth, based on its surface, generate holding structure; The mobile design adnexa special according to some, and obtain the overall structure of integral type appliance; Go out integral type appliance with the one-time formed 3 D stereo printing and making of multiple material, be supplied to doctor's Clinical practice; During Clinical practice, integral type appliance is heated to phase transition temperature and makes forcing unit become soft, be adhesively fixed on dental surface easily.Described method makes the integral type fixed appliance obtained, and comprising: forcing unit, holding unit, adnexa.
Description
Background technology
Oral cavity Fixed Orthodontics be for tooth arrangement deformity or plate bite (tooth is combined into a word, lower same), what utilize arch wire, bracket etc. to form rescues apparatus, machinery is applied to tooth and rescues force and moment, adjustment face skeleton, tooth and the triangular balance and coordination of jaw facial muscle meat, improve face type, aligning improve masticatory efficiency after rescuing after a while.20 beginnings of the century, the U.S. dentist EdwardAngle being described as the father of modern correction starts to design dental appliance, is proposed edgewise technique to nineteen twenty-eight, has established the basis of modern orthodontics.Within 1970, U.S. orthodontist Andrews proposes six standards of best natural tooth conjunction, and has invented straight wire appliance on the basis of edgewise appliance, uses convenient.At present, the straight arch wire of application locking bracket rescues the mainstream technology becoming mouth cavity orthodontic, its key is to compensate size difference between every tooth and lines of occlusion with the bracket of special parameter corresponding to different tooth position, and equally bends arch wire without the need to image space silk begg appliance again.China is until just introduce edgewise technique the eighties in last century, and main to digest and assimilate and to be applied as master over more than 30 year, orthodontic appliance main at present such as self-locking bracket locks still dependence on import, and price is high.The outpatients of the annual correction of China only has hundreds of thousands, and data show that the sickness rate of China's teenager patho-occlusion is about 50%, along with economic development and growth in the living standard, China will increase fast to the demand of orthodontic treatment, in the urgent need to having the orthodontic appliance of independent intellectual property right.
In mouth cavity orthodontic, the Main Function of arch wire is by coordinating with bracket, applies corresponding force and moment, realize the movement of tooth to the tooth and dental arch needing movement.Traditional metal arch wire due to the power decay applied very fast, mechanical property is stable not, is progressively replaced by the alloy arch wire with shape memory function.The mechanical characteristic that the orthodontic arch filament that the shape-memory material such as Nitinol makes can provide is more excellent than traditional alloy material, can the less and stable Orthodontic force of sustained release.Its operation principle is that the normal arch of human oral cavity is carried out statistical analysis and grouping according to size, and make the arch wire of one group of normal size according to this grouping, its shape is consistent with normal arch shape, is the ideal form after correction patient denture comes into line; During clinical practice, orthodontist is according to the Dental arch dimension of patient's reality selected shape and the immediate arch wire of size from the arch wire of standard; Through doctor's operation, this arch wire makes that it becomes curved, torsion etc. is fixed on patient's tooth in standard bracket, under oral temperature environment, arch wire can slow recoverable force to initial standard shape, coordinate the load that Tooth Movement is provided with bracket, realize the movement of tooth.
At present, greatest problem in the Fixed Orthodontics of measured shape memory arch wire and straight silk bow supporting groove is that arch wire and bracket are all the shape and size of standard, the position difference compensated between different dental and normal occlusion line is changed by the size of the standard bracket in different tooth position, and everyone Tooth Size exists difference, lines of occlusion also can be different from normal data.Therefore current straight wire appliance does not consider individual variation, its Orthodontic force provided inaccuracy, easily cause the amount of movement that tooth is unnecessary, need constantly to adjust therapeutic scheme and adjustment appliance compensates and revises at therapeutic process, extend treatment time and add Operative risk.
On the other hand, doctor is in clinical implementation process, and needs are manual to be determined the position of bracket and implements to paste, and workload is very large.What latest developments were got up make by computer assisted design and 3 D-printing the guide plate that bracket pastes indirectly can help doctor to find rapidly the tram on bracket upper teeth surface, alleviate the labor intensity of doctor to a certain extent, but its design process is complicated, precision is difficult to ensure.And reach 1 to two years rescue in process, needs of patients regular return visit, to change arch wire, brings inconvenience to patient, increase treatment cost.
Summary of the invention
In order to overcome the above-mentioned deficiency of prior art, the present invention proposes a kind of digitized manufacturing system method of the as a whole novel integrated fixed appliance that arch wire and bracket developed.
The manufacture method of Tooth orthodontic correction device of the present invention, comprises following making step:
1) CT data acquisition: the CT image at shooting position, patient oral cavity, CT scan can utilize the sweep spacing that spiral CT is being not more than 1 millimeter to carry out, also in can utilizing, the visual field and above dentistry cone-beam shape CT (CBCT) carry out, to guarantee to scan the region of patient's socket of the eye lower edge to complete lower jaw.The Medical Image Format DICOM file of the result standard of scanning is preserved.
2) oral cavity tissue reconstructing three-dimensional model: the medical image of CT scan is input to Medical Image Processing and three-dimensional reconstruction software as MIMICS, reconstruction patients oral cavity model, reconstruction model comprises tooth and alveolar bone, in order to obtain each independently tooth, when image procossing, root of the tooth is separated from whole image, to obtain the complete tooth comprising corona and root of the tooth, the gap between root of the tooth and alveolar bone is periodontal membrane tissue.
3) scan and rebuild oral surfaces: owing to being only included sclerous tissues and tooth and skeleton by the model of CT image reconstruction, and CT image has fault in enlargement to tooth.Therefore in order to obtain gingival surface data and accurate tooth, utilize mouth interscan instrument scan patients oral cavity, obtain oral surfaces data, preserve with STL form, then reverse reconstruction software such as Geomagic is utilized to process scan-data, reconstruct the threedimensional model of oral surfaces, this model is overlapped with the model rebuild based on CT, obtain the composite model comprising tooth, alveolar bone and gingival surface.
4) on composite model, according to the tooth misalignment of patient, work up the step of Tooth Movement, and discharge the target dentition after treatment, work out orthodontic treatment plan.According to the contrast of target dentition and original denture, calculate and comprise tooth translational movement, amount of spin, required rescue force and moment and the key parameter such as ratio, afterburning step thereof.
5) force and moment needed for Tooth Movement, by the thermodynamical model of SMP material, calculates the shape and size parameter of each section of SMP force application mechanism, and then designs forcing unit geometry, obtain its threedimensional model.
6) with the force and moment needed for Tooth Movement for parameter, utilize three-dimensional static computing formula, to calculate on every tooth required retain strength, and then obtain the size with crown surfaces fitting part on holding unit.Then, according to the threedimensional model of every tooth, based on its surface, the method thickeied by curved surface generates the basic configuration of holding structure.Because every dental surface all has complicated curve form, therefore self poisoning can be realized by laminating, and without the need to designing the guide plate indirectly pasted in addition.
7) according to some special movements of tooth as the space closure after exodontia, design special adnexa as song.
8) overlap joint between the 3-D geometric model of forcing unit adjacent between two, holding unit and adnexa is formed seamless contact, between faying surface, design hasp simultaneously increase attachment force, obtain the overall structure of integral type appliance, the geometric model number that this overall structure comprises is the summation of forcing unit number and holding unit number and adnexa number, and each geometric model STL data format is preserved.
9) the STL data of all geometric models of integral type appliance are input to 3 D Printer as in the control computer of the Connex350 type of Objet company, make with the one-time formed 3 D stereo printing technique of multiple material, be supplied to doctor's Clinical practice.During printing, integral type rescue in each geometric model locus and to be original designly consistent, can not change, constant to ensure printing rear mutual alignment relation.Because model between two adjacent in all geometric models of integral type appliance is seamless overlap joint, add hasp structure simultaneously, therefore print the entity of latter two material natural affixed and connected by hasp strengthening, form the entirety of integral type appliance.Wherein the material of forcing unit and adnexa is SMP material, can adopt polyurethane (Polyurethane, the PU) material being proved and having had shape memory function and good biological blending, and holding unit adopts the macromolecular material of high strength.
10), during Clinical practice, integral type appliance is heated to phase transition temperature (50 ° of about C) and makes forcing unit become soft, be adhesively fixed on dental surface easily.Under oral temperature environment, there is softening inversion in the soft phase in forcing unit, returns to one-time formed original shape gradually, provides continual and steady orthodontic therapy power.
Phase transition temperature described in step 10 is 50 ° of C.
A kind of fixed appliance obtained according to said method, it is characterized in that comprising: forcing unit: be made up of SMP material, match with personalized correction scheme and there is personalized three dimensions geometry, for providing the force and moment of the complex three-dimensional needed for Tooth Movement, to realize the motion such as translation, control root, rotation, torsion of tooth; Holding unit: be made up of high strength macromolecular material, fits with the crown surfaces of every tooth, has personalized shape, provide the retain strength of appliance in the process of rescuing; Because tooth surface has complicated curved-surface structure, self poisoning can be realized by holding unit and tooth surface being fitted tightly, and without the need to being designed for the positioning guide plate indirectly pasted in addition; Adnexa: for providing the force and moment of specific position and particular/special requirement, as each yeast inoculation, drag hook; Described forcing unit, holding unit, adnexa by the seamless contact of geometric model and utilize hasp structure increase attachment force, realize one-shot forming manufacture with 3 D-printing.
Advantage of the present invention is: the SMP material with shape memory function makes forcing unit, and be compounded to form the overall structure of appliance mutually with the corona holding unit of macromolecular material, this structure has the personalized shape matched with patient self tooth arrangement; Realize Rapid pasting by the holding unit self poisoning of fitting completely with the surface curve shape of every tooth, and without the need to being designed for the indirect stickup guide plate of location in addition, reduce difficulty and the intensity of doctor's clinical manipulation.Meanwhile, the orthodontic power being provided stable by the shape recovery of SMP forcing unit under oral temperature environment, continued, realizes personalized orthodontic treatment, reduces treatment time and hospital's return visit number of times that patient wears appliance.
Accompanying drawing explanation
Fig. 1 is the structural representation of the fixed appliance made by the present invention
Fig. 1 a is SMP forcing unit sectional drawing
Fig. 1 b is the using state figure of the fixed appliance made by the present invention
Fig. 2 is dental and alveolar bone threedimensional model schematic diagram
Fig. 3 is the composite model of tooth, alveolar bone and gingival surface
The schematic diagram of the target dentition after Fig. 4 the invention process
Detailed description of the invention
With reference to accompanying drawing 1-4:
The manufacture method of Tooth orthodontic correction device of the present invention, comprises following making step:
1) CT data acquisition: the CT image at shooting position, patient oral cavity, CT scan can utilize the sweep spacing that spiral CT is being not more than 1 millimeter to carry out, also in can utilizing, the visual field and above dentistry cone-beam shape CT (CBCT) carry out, to guarantee to scan the region of patient's socket of the eye lower edge to complete lower jaw.The Medical Image Format DICOM file of the result standard of scanning is preserved.
2) oral cavity tissue reconstructing three-dimensional model: the medical image of CT scan is input to Medical Image Processing and three-dimensional reconstruction software as MIMICS, reconstruction patients oral cavity model, reconstruction model comprises tooth and alveolar bone.In order to obtain each independently tooth, be separated by root of the tooth when image procossing from whole image, to obtain the complete tooth comprising corona and root of the tooth, the gap between root of the tooth and alveolar bone is periodontal membrane tissue, as shown in Figure 2.
3) scan and rebuild oral surfaces: owing to being only included sclerous tissues and tooth and skeleton by the model of CT image reconstruction, and CT image has fault in enlargement to tooth.Therefore in order to obtain gingival surface data and accurate tooth, utilize mouth interscan instrument scan patients oral cavity, obtain oral surfaces data STL form to preserve, then reverse reconstruction software such as Geomagic is utilized to process scan-data, reconstruct the threedimensional model of oral surfaces, this model is overlapped with the model rebuild based on CT, obtains the composite model comprising tooth, alveolar bone and gingival surface, as shown in Figure 3.
4) on composite model, according to the tooth misalignment of patient, work up the step of Tooth Movement, and discharge the target dentition after treatment, work out orthodontic treatment plan.According to the contrast of target dentition and original denture, calculate and comprise tooth translational movement, amount of spin, required rescue force and moment and the key parameter such as ratio, afterburning step thereof, as shown in Figure 4.
5) force and moment needed for Tooth Movement, by the thermodynamical model of SMP material, calculates the shape and size parameter of each section of SMP force application mechanism, and then designs forcing unit geometry, obtain its threedimensional model.
6) with the force and moment needed for Tooth Movement for parameter, utilize three-dimensional static computing formula, to calculate on every tooth required retain strength, and then obtain the size with crown surfaces fitting part on holding unit.Then, according to the threedimensional model of every tooth, based on its surface, the method thickeied by curved surface generates the basic configuration of holding structure.Because every dental surface all has complicated curve form, therefore self poisoning can be realized by laminating, and without the need to designing the guide plate indirectly pasted in addition.
7) according to some special movements of tooth as the space closure after exodontia, design special adnexa as song.
8) overlap joint between the 3-D geometric model of forcing unit adjacent between two, holding unit and adnexa is formed seamless contact, between faying surface, design hasp simultaneously increase attachment force, obtain the overall structure of the integral type appliance shown in Fig. 1, the geometric model number that this overall structure comprises is the summation of forcing unit number and holding unit number and adnexa number, and each geometric model STL data format is preserved.
9) the STL data of all geometric models of integral type appliance are input to 3 D Printer as in the control computer of the Connex350 type of Objet company, make with the one-time formed 3 D stereo printing technique of multiple material, be supplied to doctor's Clinical practice.During printing, integral type rescue in each geometric model locus and to be original designly consistent, can not change, constant to ensure printing rear mutual alignment relation.Because model between two adjacent in all geometric models of integral type appliance is seamless overlap joint, add hasp structure simultaneously, therefore print the entity of latter two material natural affixed and connected by hasp strengthening, form the entirety of integral type appliance.Wherein the material of forcing unit and adnexa is SMP material, can adopt polyurethane (Polyurethane, the PU) material being proved and having had shape memory function and good biological blending, and holding unit adopts the macromolecular material of high strength;
10), during Clinical practice, integral type appliance is heated to phase transition temperature (50 ° of about C) and makes forcing unit become soft, be adhesively fixed on dental surface easily.Under oral temperature environment, there is softening inversion in the soft phase in forcing unit, returns to one-time formed original shape gradually, provides continual and steady orthodontic therapy power.
Phase transition temperature described in step 10 is 50 ° of C.
Polyurethane (Polyurethane, PU) material described in step 9, by fixing hard phase 4.4 ' methylene carbanil and the soft phase polycaprolactone of inversion (poly-ε-caprolactone, PCL) caulked copolymerization.As the typical SMP material of one, the raw material of synthesis PU can be bought in the market, then utilize material Preparation equipment under condition of different temperatures, synthesize the PU material met the demands.
The fixed appliance for personalized orthodontic treatment that this method obtains, this appliance forms as a whole by SMP forcing unit 1, macromolecular material corona holding unit 2 and adnexa 3.In order to obtain the personalized shape with patient self denture Data Matching, after reconstructing by patient CT data the three-dimensional oral cavity model comprising skeleton and tooth, data after rebuilding with the interscan of patient oral cavity overlap and obtain comprising the composite model of tooth, skeleton and gingival soft tissue, according to tooth arrangement and the skeleton condition of patient, work up orthodontic treatment plan, the final denture arrangement after obtaining medical treatment; On this basis, design the structure of forcing unit and holding unit respectively, namely its shape matches with the denture after orthodontic treatment and tooth position, is the shape that SMP forcing unit needs in the memory recovered; During clinical manipulation, integral type appliance is placed in certain temperature environment and makes its deliquescing, the form of then being pasted by holding unit can be fixed on the corona in patient oral cavity easily.
Appliance as shown in Figure 1, is divided into forcing unit, corona holding unit and adnexa by this invention cardinal principle:
(1) forcing unit 1: be made up of SMP material, match with personalized correction scheme and there is personalized three dimensions geometry, circle as shown in the figure, square or triangle equal section, for providing the force and moment of the complex three-dimensional needed for Tooth Movement, to realize the motion such as translation, control root, rotation, torsion of tooth.
(2) holding unit 2: be made up of high strength macromolecular material, fits with the crown surfaces of every tooth, has personalized shape, provide the retain strength of appliance in the process of rescuing.Because tooth surface has complicated curved-surface structure, self poisoning can be realized by holding unit and crown surfaces being fitted tightly, and without the need to being designed for the positioning guide plate indirectly pasted in addition.
(3) adnexa 3: for providing the force and moment of specific position and particular/special requirement, as each yeast inoculation, drag hook etc.
Described forcing unit, holding unit, adnexa by the seamless contact of geometric model and utilize hasp structure increase attachment force, realize one-shot forming manufacture with 3 D-printing.
Claims (2)
1. a manufacture method for Tooth orthodontic correction device, comprises following making step:
1) CT data acquisition: the CT image at shooting position, patient oral cavity, CT scan can utilize the sweep spacing that spiral CT is being not more than 1 millimeter to carry out, also in can utilizing, the visual field and above dentistry cone-beam shape CT (CBCT) carry out, to guarantee to scan the region of patient's socket of the eye lower edge to complete lower jaw; The Medical Image Format DICOM file of the result standard of scanning is preserved;
2) oral cavity tissue reconstructing three-dimensional model: the medical image of CT scan is input to Medical Image Processing and three-dimensional reconstruction software MIMICS, reconstruction patients oral cavity model, reconstruction model comprises tooth and alveolar bone; In order to obtain each independently tooth, be separated by root of the tooth when image procossing from whole image, to obtain the complete tooth comprising corona and root of the tooth, the gap between root of the tooth and alveolar bone is periodontal membrane tissue;
3) scan and rebuild oral surfaces: owing to being only included sclerous tissues and tooth and skeleton by the model of CT image reconstruction, and CT image has fault in enlargement to tooth; Therefore in order to obtain gingival surface data and accurate tooth, utilize mouth interscan instrument scan patients oral cavity, obtain oral surfaces data STL form to preserve, then reverse reconstruction software Geomagic is utilized to process scan-data, reconstruct the threedimensional model of oral surfaces, this model is overlapped with the model rebuild based on CT, obtains the composite model comprising tooth, alveolar bone and gingival surface;
4) on composite model, according to the tooth misalignment of patient, work up the step of Tooth Movement, and discharge the target dentition after treatment, work out orthodontic treatment plan; According to the contrast of target dentition and original denture, calculate and comprise tooth translational movement, amount of spin, the required key parameter rescuing force and moment and ratio thereof, afterburning step;
5) force and moment needed for Tooth Movement, by the thermodynamical model of SMP material, calculates the shape and size parameter of each section of SMP force application mechanism, and then designs forcing unit geometry, obtain its threedimensional model;
6) with the force and moment needed for Tooth Movement for parameter, utilize three-dimensional static computing formula, to calculate on every tooth required retain strength, and then obtain the size with crown surfaces fitting part on holding unit; Then, according to the threedimensional model of every tooth, based on its surface, the method thickeied by curved surface generates the basic configuration of holding unit; Because every dental surface all has complicated curve form, therefore realize self poisoning by laminating, and without the need to designing the guide plate indirectly pasted in addition;
7) according to some special movements of tooth, special adnexa song or drag hook is designed;
8) overlap joint between the 3-D geometric model of forcing unit adjacent between two, holding unit and adnexa is formed seamless contact, between faying surface, design hasp simultaneously increase attachment force, obtain the overall structure of integral type appliance, the geometric model number that this overall structure comprises is the summation of forcing unit number and holding unit number and adnexa number, and each geometric model STL data format is preserved;
9) the STL data of all geometric models of integral type appliance are input to 3 D Printer to control, in computer, to make with the one-time formed 3 D stereo printing technique of multiple material, be supplied to doctor's Clinical practice; During printing, the locus of each geometric model in integral type appliance and to be original designly consistent, can not change, constant to ensure printing rear mutual alignment relation; Because model between two adjacent in all geometric models of integral type appliance is seamless overlap joint, add hasp structure simultaneously, therefore print the entity of latter two material natural affixed and connected by hasp strengthening, form the entirety of integral type appliance; Wherein the material of forcing unit and adnexa is SMP material, adopts and has been proved polyurethane (Polyurethane, the PU) material with shape memory function and good biological blending, and holding unit adopts the macromolecular material of high strength.
2. one kind makes the integral type appliance obtained according to method according to claim 1, it is characterized in that comprising: forcing unit: be made up of SMP material, match with personalized correction scheme and there is personalized three dimensions geometry, for providing the force and moment of the complex three-dimensional needed for Tooth Movement, with realize tooth translation, control root, rotation, twist motion; Holding unit: be made up of macromolecular material, fits with the crown surfaces of every tooth, has personalized shape, provide the retain strength of appliance in the process of rescuing; Because tooth surface has complicated curved-surface structure, realize self poisoning by holding unit and tooth surface being fitted tightly, and without the need to being designed for the positioning guide plate indirectly pasted in addition; Adnexa: for providing song or the drag hook of the force and moment of specific position and particular/special requirement; Described forcing unit, holding unit, adnexa by the seamless contact of geometric model and utilize hasp structure increase attachment force, realize one-shot forming manufacture with 3 D-printing.
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| CN103405276A (en) | 2013-11-27 |
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