CN102078223A - Reasonable arrangement inducing device for teeth of children and manufacturing method thereof - Google Patents
Reasonable arrangement inducing device for teeth of children and manufacturing method thereof Download PDFInfo
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- CN102078223A CN102078223A CN2010106093637A CN201010609363A CN102078223A CN 102078223 A CN102078223 A CN 102078223A CN 2010106093637 A CN2010106093637 A CN 2010106093637A CN 201010609363 A CN201010609363 A CN 201010609363A CN 102078223 A CN102078223 A CN 102078223A
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Abstract
The invention relates to a reasonable arrangement inducing device for teeth of children and a manufacturing method thereof. The device is characterized by consisting of an arc-shaped groove body which is sleeved on the teeth; the shape, the size and the spatial arrangement position of the internal of the arc-shaped groove body are different from those of the teeth to be induced so that certain induction force to the teeth to be induced can be generated on the inner surface of the arc-shaped groove body along any direction; therefore, the teeth are induced to be arranged along a target direction reasonably. The device aims to overcome the defects of conventional dentofacial deformity correctors, tooth positioners and related tooth induction methods, and fulfills the aim of inducing the reasonable arrangement of the teeth of the children individually and accurately according to special situations of the teeth of the children.
Description
Technical field
The present invention relates to a kind of teenager teeth and rationally arrange apparatus for deivation and manufacture method thereof.
Background technology
Medically stick up before the chin with the people, after contract or tooth uneven, this phenomenon is called malocclusion.Malocclusion usually can cause brushing teeth not thorough, and food debris can be left in these positions, makes various focusing depths represented, dental caries (dental caries) and periodontitis etc. occur, influences oral health.Simultaneously, malocclusion also has a strong impact on social activity and work, and especially teenager and child usually feel oneself inferior owing to the ridicule who is subjected to classmate or junior partner becomes, and influence child's mental health.The investigation of China's stomatology meeting shows that Chinese children is 51.84% in the malocclusion prevalence of milk teeth period, and replacing the tooth phase is 71.21%, and the permanent teeth initial stage is 72.92%.
For the treatment of malocclusion, medically often take the method for orthodontics to carry out.Orthodontics is to treat wrong jaw abnormality by methods such as just abnormal or surgical operations.Common clinically antidote mainly contains removable appliance, fixed appliance, function corrector and orthognathic surgery, wherein is that the fixed appliance of representative is the most frequently used with the metal bracket.
There are the following problems for existing appliance:
1, non-personalized design is made, and precision is low.Existing appliance mostly adopts standardized equipment, and for example the metal bracket appliance adopts Standard arch wire, can not well react patient's personal feature, has brought the uncertainty of treatment thus.Eliminating these uncertainties then needs the doctor that abundant clinical practice experience and skilled operation skill are arranged, and therefore to executing attending doctor higher requirement is arranged;
2, tooth and the stressed distribution of tooth jaw are wayward.When adopting the elastic metallic arch wire to induce, the metal arch wire is to be delivered on tooth and the tooth sentence by a little metal bracket to the effect of tooth and tooth jaw.Tinsel contacts or the line contact for point with the way of contact of bracket.Because this metal holder limited and position can not be adjusted with the contact area of tooth, is subjected to tending to the power of Standard arch wire position so can only ensure tooth and alveolar bone, but can not ensure the biomechanics reasonability of its power distribution;
3, the fixing teeth appliance is worn for a long time and can be caused damage to tooth body and periodontal tissue owing to need be fixed on the facing;
4, the dental aligners influence is attractive in appearance.Existing dental aligners is metal or plastic material mostly, directly influences the attractive in appearance of oral cavity in the therapeutic process;
Advantages such as stealthy appliance has personalization as existing novel fixed appliance, and is attractive in appearance are induced but existing stealthy appliance mostly is applicable to adult tooth.Teenager teeth exists the tangible different tooth jaws that are to be grown up to finalize the design with adult tooth, can not change under the naturalness, and child's tooth jaw was conducted oneself well in the reasonable permutations phase, even in the permanent teeth phase, tooth is still unstable, therefore,, rather than correct because of inducing it rationally to be arranged as the master for teenager teeth.Simultaneously, existing stealthy appliance is being executed when controlling in the child, can well wraps around tooth because of having personalized feature, but also so hindered the reasonable arrangement of deciduous teeth, and also often cause problem such as appliance location instability because of loss of tooth in the tooth stage of replacement, have a strong impact on therapeutic effect.
Summary of the invention
The object of the present invention is to provide a kind of teenager teeth rationally to arrange apparatus for deivation and manufacture method thereof, be intended to overcome weak point above-mentioned existing dental jaw deformity corrector, braces and associated teeth abductive approach, and according to the residing special circumstances of teenager teeth, the realization personalization, accurately guide the raisonne target of teenager teeth.The present invention combines reverse Engineering Technology with the medical science modelling technique, obtain the three-dimensional digitalization model of individual patients feature by the method for machine vision, by whole process and each intermediate link of design of Computer-aided Design Technology simulation treatment, adopt rapid shaping and air compression molding techniques to make clear, thin-walled tooth persuader simultaneously on this basis with self adaptation concavity architecture.
Teenager teeth of the present invention is rationally arranged the manufacture method of apparatus for deivation, it is characterized in that: carry out according to the following steps:
(1) (promptly fills in the mouth according to a conventional method by odontologist with alginate, obtain alveolar former, reuse Gypsum Fibrosum filling former) acquisition patient's tooth jaw physical model, obtain the digital model of tooth jaw by the digital raster method, its ultimate principle is: the surface of the optical grating projection of coding structure to the Gypsum Fibrosum physical model, grating fringe can bend along with the height relief of solid object surface and be out of shape, the deformed grating striped that produces through the body surface reflection has comprised the object surfaces shape information, then by two high resolution CCD cameras according to the binocular vision principle, absorb the grating fringe of distortion synchronously from two different angles, can obtain the three-dimensional profile cloud data of object afterwards to the deformed grating analysis of different directions;
(2) this digital model is handled and reconstruct acquisition original dental jaw threedimensional model, comprised the steps:
A) data registration: from a plurality of visual angles plaster model is carried out data acquisition, by looking the data registration technique data at each visual angle are carried out the coordinate unification more again;
B) date processing: the whole cloud data behind the registration is carried out overlapping some cloud integrate, processing such as noise removal are to guarantee the quality of follow-up surface reconstruction;
C) surface reconstruction: the whole cloud data through date processing is carried out surface reconstruction;
D) model correction: there is a small amount of tiny hole in the threedimensional model that reconstruct obtains, must fill up hole, obtains complete tooth jaw Gypsum Fibrosum three-dimensional digitalization model;
(3) according to this threedimensional model, utilize 3-matic forward design software to design and induce the raisonne concavity structure of inducing of tooth, determine the step of inducing process and final, and obtain the tooth jaw threedimensional model in each step;
(4) employing under the control of computer, is produced patient tooth jaw reasonable permutations entity positive model in therapeutic process according to middle threedimensional model and target threedimensional model based on the Rapid Prototyping technique of laser sintered principle;
(5) be that master mold utilizes air compression punch die technology (promptly utilize the vacuum suction molding device, make the apparatus for deivation blank by the vacuum suction principle) to produce required apparatus for deivation blank with this positive model;
(6) specific requirement of wearing, using according to use is processed and is repaired blank again.
Teenager teeth of the present invention is rationally arranged apparatus for deivation, it is characterized in that: constitute by an arc groove body that is set on the tooth, shape, size and the spatial arrangements position of described arc groove body inside is with to wait to induce tooth different, induce tooth to produce certain induction force so that the inner surface of arc groove body can be treated along any direction, induce tooth rationally to arrange to target direction.
Above-mentioned arc groove external body shape is similar to pairing dental surface shape.The corona of described arc groove body wraps around tooth, front and back sides and part gingiva, the slot opening of described arc groove body is positioned at the gingiva bottom.The inner dental growth space of reserving of described arc groove body.
The present invention has following advantage:
1) personal feature according to patient designs, and persuader has personalized characteristics, can carry out accurate treatment, and persuader uses simple, and the patient can wear voluntarily, greatly reduces the requirement for the doctor;
2) produce by elastic deformation and induce motive force, induce tooth rationally to arrange, the way of contact of power is the face contact, and is subjected to the force direction can be towards removing the outside any direction of root of the tooth direction;
3) persuader is a clear, thin-walled concavity architecture, is worn in the oral cavity not obviously, does not affect the appearance;
4) tooth and periodontal tissue are not caused damage;
5) reserve the growing space for deciduous teeth, and in use can also guide deciduous teeth rationally to arrange, prevent breast alignment deviations rationally;
6) adopt full tooth self adaptation to cooperate localized mode, under the situation that has individual teeth to come off, still can guarantee the stable and therapeutical effect of persuader;
7) maintenance that can also carry out tooth in inductive treatment is treated, and prevents recurrence.
Description of drawings
Fig. 1 is the perspective view of persuader of the present invention.
Fig. 2 induces application of force schematic diagram for the present invention.
Fig. 3 is the computer-aided design procedure chart.
Fig. 4 is the rapid shaping schematic diagram.
Among the figure: 1 wears deformation position for the arc groove body, and 2 is arc groove body home position, and 3 is tooth; 4 is induction force; 5 is gingiva; 6 is scraper; 7 is laser instrument and scanning system; 8 is photocurable liquid polymer; 9 is liquid level; 10 is workpiece; 11 is lifting arm; 12 is liquid bath; 13 is the liftable workbench.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
Please refer to Fig. 1, teenager teeth of the present invention is rationally arranged apparatus for deivation, it is characterized in that: constitute by an arc groove body that is set on the tooth, shape, size and the spatial arrangements position of described arc groove body inside is with to wait to induce tooth different, induce tooth to produce certain induction force so that the inner surface of arc groove body can be treated along any direction, induce tooth rationally to arrange to target direction.
Above-mentioned arc groove external body shape is similar to pairing dental surface shape.The corona of described arc groove body wraps around tooth, front and back sides and part gingiva, the slot opening of described arc groove body is positioned at the gingiva bottom.The inner dental growth space of reserving of described arc groove body.
The principle of determining persuader parcel scope is: guaranteeing that induction force satisfies under the treatment requirement and the rational prerequisite that distributes, and reduces the parcel area, as much as possible so that the surrounding of tooth is as much as possible near home; When using, this apparatus for deivation requires the whole tooth coronas of parcel patient, thisly can prevent to cause phenomenons such as persuader is loosening because of individual teeth comes off by the fixed mode of full tooth, imperforation design simultaneously also helps to prevent in use to talk abusively because of factors such as feed deposits to eat between the slit.
Tooth of the present invention is rationally arranged persuader and is being analyzed child and adult's different dental environment, and takes into full account design under the situation of virtual condition of teenager teeth.Teenager teeth exists the tangible different tooth jaws that are to be grown up to finalize the design with adult tooth, under naturalness, can not change, and child's tooth jaw was conducted oneself well in the growth change phase, even in the permanent teeth phase, tooth is still unstable, still has the trend of growth, therefore,, rather than correct because of inducing its growth to be arranged as the master for teenager teeth.On this conceptual foundation, the present invention to be inducing, and mainly by tooth being applied the induction force on the certain orientation, thereby the guiding tooth reaches ideal target location at last towards the target direction permutations.
When metal bracket fixed appliance commonly used was corrected teenager teeth, the metal arch wire was to be delivered on tooth and the tooth sentence by a little metal bracket to the effect of tooth and tooth jaw.Tinsel contacts or the line contact for point with the way of contact of bracket.Because this metal holder limited and position can not be adjusted with the contact area of tooth, is subjected to tending to the power of Standard arch wire position so can only ensure tooth and alveolar bone, but the biomechanics reasonability of its power distribution can not be ensured, and the discomfort of mouthfeel can be caused; Limited owing to induction force simultaneously, thereby induction duration is long.And the present invention produces needed induction force with the resilience force of three dimensional structure when the little strain, and the size of induction force stable and its value, direction and distribution all are easy to control, therapeutic efficiency height; Sense of discomfort alleviates in the patient oral cavity, is easy to accept.
Figure 2 shows that the application of force schematic diagram of persuader of the present invention.This persuader in use, small strain takes place because of influenced by former tooth position in the arc groove intracoelomic cavity, owing to distortion produces reciprocal active force, this power directly acts on the contact surface of concavity structure and tooth simultaneously, and the transfer mode of power is the face contact.This active force is induction force, and it can induce tooth to the reasonable permutations of correct direction.
The induction force that persuader of the present invention acts on patient's tooth jaw (comprising tooth) when using is a distributed in three dimensions power, promptly be surrounded on the non-coplanar force on corona side and the occlusal surface, by size and the distribution of adjusting these power, can produce act on the tooth, remove the power where exodontia direction local official makes progress, the reasonable arrangement of guiding tooth on any direction except that this direction.
If the young tooth that the tooth that the concavity structure is wrapped up described in this persuader does not grow up to, the concavity structure will be reserved tooth and rationally arrange the space, persuader not only can not hinder tooth in use rationally to be arranged, and can also guide tooth rationally to arrange, and prevents that tooth from rationally arranging to bad direction.The corona tooth side of the arc groove body parcel upper jaw or all teeth of lower jaw and tooth below part gingiva, utilize all teeth to finish location and fixing, even therefore the tooth that is wrapped up when the arc groove body comes off in use, tooth kept the location constant before and after persuader still can rely on.
Persuader of the present invention adopts the pharmaceutical grade macromolecule resin material to make, and this material also is widely used in the jaw pad making just abnormal back keeper and prevent sleep bruxism etc.This apparatus needs complete use, every cover comprises one or more (can reach dozens of at the most) persuader, and each persuader can make patient's tooth jaw produce a certain amount of pincushion distortion shape on the original basis; Use each persuader can make patient's tooth jaw successively from gradually change to the end dbjective state of original deformities.
Suitably arrange the single instrumentation time in this rig, can also keep therapeutic process to combine inductive treatment and tooth, effectively prevent recurrence.
As shown in Figure 3, according to this original dental jaw threedimensional model, utilize the forward design software 3-matic based on digital model of specialty can design target tooth jaw threedimensional model and a plurality of middle tooth jaw threedimensional model of inducing process.
Adopt the rapid shaping technique of laser sintered principle then, under the control of computer, use special equipment to produce the entity positive model of patient's tooth jaw according to middle threedimensional model and target threedimensional model, be that master mold is molded into required apparatus for deivation blank with this positive model again, repair again at last, processing such as fairing promptly obtains operational persuader.
Rapid shaping (Rapid Prototyping is called for short RP) technology is to grow up in the later stage eighties 20th century, the technology general name of the three-dimensional physical entity of any complicated shape of the quick manufacturing that cad model directly drives.As shown in Figure 4, the ultimate principle of rapid shaping technique is the shape according to part, manufactures a cross section with certain small thickness and given shape at every turn, and then they are successively bondd, and has just obtained the spatial part of required manufacturing.Certainly, whole process is under the control of computer, is finished automatically by rapid forming system.The used moulding material difference of rapid prototyping system that different company makes, the operation principle of system is also different, but its ultimate principle all is the same, that is exactly " layering manufacturing, stack successively ".This technology can be called " growth method " or " addition " visually.Rapid shaping technique includes several big classes such as photocuring molding method, selective laser sintering method, laminated solid mass autofrettage, fusion sediment autofrettage and 3 D-printing.Photocuring molding method is to adopt laser pointwise illumination light-cured resin, thereby the solidified method of induced material generation chemical change is shaped; The laminated solid mass autofrettage is to adopt the cut foil, realize under the pressure of pressure roller and heat transfer effect by PUR between the foil bonding, superposition forming from level to level; The selective laser sintering method is to adopt laser pointwise illumination dusty material to make the material powder fusion, or the connection that is wrapped in the outer solid adhesive fusion realization material of dusty material is shaped; The 3 D-printing moulding process is to adopt the method injection melted material stack shaping of similar inkjet printing or the method shaping that bonding agent adhesive powder powder material is sprayed in pointwise; The fusion sediment autofrettage is that the thermoplastic forming material is sent into behind the shower nozzle heating and melting and ejection, progressively stack shaping therein continuously.
In the actual therapeutic process, after obtaining the original tooth deformity gnathode of patient, once can design and produce a complete set (comprising one or more) apparatus for deivation.
Teenager teeth of the present invention is rationally arranged the manufacture method of apparatus for deivation, it is characterized in that: carry out according to the following steps:
(1) (promptly fills in the mouth according to a conventional method by odontologist with alginate, obtain alveolar former, reuse Gypsum Fibrosum filling former) acquisition patient's tooth jaw physical model, obtain the digital model of tooth jaw by the digital raster method, its ultimate principle is: the surface of the optical grating projection of coding structure to the Gypsum Fibrosum physical model, grating fringe can bend along with the height relief of solid object surface and be out of shape, the deformed grating striped that produces through the body surface reflection has comprised the object surfaces shape information, then by two high resolution CCD cameras according to the binocular vision principle, absorb the grating fringe of distortion synchronously from two different angles, can obtain the three-dimensional profile cloud data of object afterwards to the deformed grating analysis of different directions;
(2) this digital model is handled and reconstruct acquisition original dental jaw threedimensional model, comprised the steps:
A) data registration: because the straight line line that light is propagated, obtain in the tooth jaw surface data process in the digital raster method, once can only obtain the partial information on tooth jaw plaster model surface, for obtaining complete tooth jaw surface three dimension model, must carry out data acquisition to plaster model from a plurality of visual angles, by looking the data registration technique data at each visual angle be carried out the coordinate unification more again;
B) date processing: the whole cloud data behind the registration is carried out overlapping some cloud integrate, processing such as noise removal are to guarantee the quality of follow-up surface reconstruction;
C) surface reconstruction: the whole cloud data through date processing is carried out surface reconstruction;
D) model correction: there is a small amount of tiny hole in the threedimensional model that reconstruct obtains, must fill up hole, obtains complete tooth jaw Gypsum Fibrosum three-dimensional digitalization model;
(3) according to this threedimensional model, utilize 3-matic forward design software to design and induce the raisonne concavity structure of inducing of tooth, determine the step of inducing process and final, and obtain the tooth jaw threedimensional model in each step;
(4) employing under the control of computer, is produced patient tooth jaw reasonable permutations entity positive model in therapeutic process according to middle threedimensional model and target threedimensional model based on the Rapid Prototyping technique of laser sintered principle;
(5) be that master mold utilizes air compression punch die technology (promptly utilize the vacuum suction molding device, make the apparatus for deivation blank by the vacuum suction principle) to produce required apparatus for deivation blank with this positive model;
(6) specific requirement of wearing, using according to use is processed and is repaired blank again.
The present invention does not limit to above-mentioned preferred forms, and anyone can draw other various forms of teenager teeths and rationally arrange apparatus for deivation and manufacture method thereof under enlightenment of the present invention.All equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (5)
1. manufacture method that teenager teeth is rationally arranged apparatus for deivation is characterized in that: carry out according to the following steps:
(1) obtains patient's tooth jaw physical model according to a conventional method by odontologist, obtain the digital detal cast of tooth jaw by the digital raster method;
(2) this digital detal cast is handled and reconstruct acquisition original dental jaw threedimensional model, comprised the steps:
A) data registration: from a plurality of visual angles plaster model is carried out data acquisition, by looking the data registration technique data at each visual angle are carried out the coordinate unification more again;
B) date processing: the whole cloud data behind the registration is carried out overlapping some cloud integrate, processing such as noise removal are to guarantee the quality of follow-up surface reconstruction;
C) surface reconstruction: the whole cloud data through date processing is carried out surface reconstruction;
D) model correction: there is a small amount of tiny hole in the threedimensional model that reconstruct obtains, must fill up hole, obtains complete tooth jaw Gypsum Fibrosum three-dimensional digitalization model;
(3) according to this threedimensional model, utilize 3-matic forward design software to design and induce the raisonne arc groove body of tooth, determine the intermediate steps and the final goal of inducing process, and obtain the tooth jaw threedimensional model in each step;
(4) employing under the control of computer, is produced patient tooth jaw tooth in therapeutic process rationally arrangement stepping entity positive model according to middle threedimensional model and target threedimensional model based on the Rapid Prototyping technique of laser sintered principle;
(5) be that master mold utilizes air compression punch die fabrication techniques to go out required apparatus for deivation blank with the entity positive model;
(6) specific requirement of wearing, using according to use is processed and is repaired blank again.
2. a teenager teeth is rationally arranged apparatus for deivation, it is characterized in that: constitute by an arc groove body that is set on the tooth, shape, size and the spatial arrangements position of described arc groove body inside is with to wait to induce tooth different, induce tooth to produce certain induction force so that the inner surface of arc groove body can be treated along any direction, induce tooth rationally to arrange to target direction.
3. teenager teeth according to claim 2 is rationally arranged apparatus for deivation, it is characterized in that: described arc groove external body shape is similar to pairing dental surface shape.
4. teenager teeth according to claim 2 is rationally arranged apparatus for deivation, it is characterized in that: the corona of described arc groove body wraps around tooth, front and back sides and part gingiva, the slot opening of described arc groove body is positioned at the gingiva bottom.
5. teenager teeth according to claim 2 is rationally arranged apparatus for deivation, it is characterized in that: the inner dental growth space of reserving of described arc groove body.
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Cited By (9)
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| CN102772255A (en) * | 2012-08-06 | 2012-11-14 | 周运松 | Auxiliary assembly used for growth of teeth |
| CN103494653A (en) * | 2013-10-17 | 2014-01-08 | 福州大学 | Method for digitally measuring dental jaw growth and development laws |
| WO2016154849A1 (en) * | 2015-03-30 | 2016-10-06 | 北京大学口腔医院 | Printing spray head, three-dimensional printer and control method |
| CN106580488A (en) * | 2017-01-24 | 2017-04-26 | 上海隐齐齿科科技有限公司 | Method for manufacturing personalized muscular function inducer |
| CN108495597A (en) * | 2015-09-08 | 2018-09-04 | 马丁·G·马茨 | Tooth positioning appliances and its manufacture and the system and method used |
| CN109452924A (en) * | 2018-10-25 | 2019-03-12 | 上海交通大学医学院附属第九人民医院 | A kind of preparation method of universal labial teeth mouth prop |
| CN110063806A (en) * | 2019-04-30 | 2019-07-30 | 北京大学口腔医学院 | For improving the auxiliary device and application method of 3-D scanning precision in polydonita position mouthful |
| CN110288640A (en) * | 2019-06-28 | 2019-09-27 | 电子科技大学 | Point cloud registration method based on convex density maximum |
| CN112368759A (en) * | 2018-06-07 | 2021-02-12 | 株式会社德山齿科 | Demonstration appliance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102772255A (en) * | 2012-08-06 | 2012-11-14 | 周运松 | Auxiliary assembly used for growth of teeth |
| CN103494653A (en) * | 2013-10-17 | 2014-01-08 | 福州大学 | Method for digitally measuring dental jaw growth and development laws |
| CN103494653B (en) * | 2013-10-17 | 2015-10-14 | 福州大学 | A kind of digital measuring method of tooth jaw growth-development law |
| WO2016154849A1 (en) * | 2015-03-30 | 2016-10-06 | 北京大学口腔医院 | Printing spray head, three-dimensional printer and control method |
| CN106457666A (en) * | 2015-03-30 | 2017-02-22 | 北京大学口腔医院 | Printing spray head, three-dimensional printer and control method |
| CN106457666B (en) * | 2015-03-30 | 2020-01-21 | 北京大学口腔医院 | Printing nozzle, three-dimensional printer and control method |
| CN108495597A (en) * | 2015-09-08 | 2018-09-04 | 马丁·G·马茨 | Tooth positioning appliances and its manufacture and the system and method used |
| US11065085B2 (en) | 2015-09-08 | 2021-07-20 | ArchForm Inc. | Tooth-positioning appliance, systems and methods of producing and using the same |
| CN106580488A (en) * | 2017-01-24 | 2017-04-26 | 上海隐齐齿科科技有限公司 | Method for manufacturing personalized muscular function inducer |
| US11779447B2 (en) | 2018-06-07 | 2023-10-10 | Tokuyama Dental Corporation | Demonstration instrument |
| CN112368759A (en) * | 2018-06-07 | 2021-02-12 | 株式会社德山齿科 | Demonstration appliance |
| CN112368759B (en) * | 2018-06-07 | 2022-06-14 | 株式会社德山齿科 | Demonstration appliance |
| CN109452924A (en) * | 2018-10-25 | 2019-03-12 | 上海交通大学医学院附属第九人民医院 | A kind of preparation method of universal labial teeth mouth prop |
| CN110063806A (en) * | 2019-04-30 | 2019-07-30 | 北京大学口腔医学院 | For improving the auxiliary device and application method of 3-D scanning precision in polydonita position mouthful |
| CN110063806B (en) * | 2019-04-30 | 2021-03-23 | 北京大学口腔医学院 | Auxiliary device for improving three-dimensional scanning precision in multi-tooth-position mouth and using method |
| CN110288640B (en) * | 2019-06-28 | 2021-05-14 | 电子科技大学 | Point cloud registration method based on convex density extreme value |
| CN110288640A (en) * | 2019-06-28 | 2019-09-27 | 电子科技大学 | Point cloud registration method based on convex density maximum |
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Application publication date: 20110601 |