CN103494653B - A kind of digital measuring method of tooth jaw growth-development law - Google Patents
A kind of digital measuring method of tooth jaw growth-development law Download PDFInfo
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Abstract
The present invention relates to Computer-Aided treatment in orthodontics technical field, particularly a kind of digital measuring method of tooth jaw growth-development law, Continuous Tracking also regularly obtains the dentognathic model of same children population, therefrom filter out the dentognathic model of normal (tooth conjunction), utilize tooth jaw palatine fold central incisor nipple mid point, left first palatine fold mid point, the dentognathic model of right first palatine fold mid point 3 different growth and development stages of the same individuality of position relationship registration, respectively with the dental arch curve variable quantity data that are reference measurement next stage jawbone of dentognathic model previous stage, finally carry out statistical analysis and determine this area's normal teeth jaw growth-development law.The method measuring accuracy is high, and measurement result is reliable and stable, and measuring process is simple.
Description
Technical field
The present invention relates to Computer-Aided treatment in orthodontics technical field, particularly a kind of digital measuring method of tooth jaw growth-development law.
Background technology
The growth promoter of tooth jaw is one of most important theories basis of orthodontics.Dentognathic model can be objective and intactly record relation between the form size of tooth, alveolar bone, dental arch etc., pathological changes, the arrangement of tooth, (tooth conjunction) curve height and upper lower jaw etc., is the important method of research child tooth jaw growth promoter.In addition, not agnate, between region and the crowd of sex tooth jaw morphosis has respective feature and rule, and correlational study complexity is various.Along with the progress of science and technology, the exploratory development of tooth jaw growth promoter is observed by transverse section and is transferred long-term longitudinal study to, information gathering develops into stereoscopic three-dimensional from conventional two-dimensional, add the development that computer technology is maked rapid progress, the application of various functional software, deeply and carefully can observe the growth change of jawbone on the one hand, on the other hand by the growth tendency of child in all ages and classes stage can be understood to the measurement of dental arch, attractive in appearance after the opportunity of guidance is stung (tooth conjunction) inductive treatment and treatment, function, stability etc., and sum up the growth-development law of normal person, the factor analyzed mistake (tooth conjunction) clinically to help orthodontist and formed, mechanism, and auxiliary to diagnose, the design of therapeutic scheme and the assessment for the treatment of prognosis.
Orthodontic therapy effect is mainly subject to the impact of therapeutic modality and cranium Maxillary region growth promoter.Wherein orthodontist is generally known quite well and is controlled orthodontic treatment to the impact of rectifying effect and effect, but easily ignore or compare the growth change being difficult to predict face, particularly single individuality, its growth opportunity, increment and the direction of growth are on the impact of rectifying effect and prognosis.Prediction clinically has certain limitation, but still need according to the growth change meansigma methods of the cranium jaw surface structure feature of individuality and this cranium jaw face type to its simple forecast, understand its growth tendency may act on correction, design therapeutic scheme, hold treatment timing and orthodontic treatment time, in orthodontic treatment process, note the growth change of observing patient, adjustment treatment plan and scheme in time simultaneously.Its growth potential of abundant excavation, good growth can contribute to rescuing of upper and lower sagittal jaw relationship, otherwise, then can increase the difficulty rescued.In addition, different hold modes is adopted according to the cranium jaw surface structure feature of patient and growth stage.
The measurement of dentognathic model mainly contains contact type measurement and non-contact measurement two kinds.Contact type measurement mainly carries out direct contact measurement by various gauge to dentognathic model, is divided into again manual contact measurement and pin to touch mechanical measurement.Hand dipping is a kind of traditional measuring method, still be widely used at present, main tool is: ruler, divider, slide gauge and universal protractor, it is a kind of two-dimensional measurement method, there is cost few, be applicable to the advantage that clinical individual models is measured, but owing to using instrument hard, thus anhydrite must be recorded, need a large amount of space stored models simultaneously, the operation of this method is wasted time and energy, precision is not high, camber line can not be measured, angle between curved surface or arbitrary plane, cannot make comprehensively to tooth jaw complex geometry form, accurate quantitative description and analysis, be difficult to provide the complex geometry form of tooth jaw comprehensively describe and analyze, repeatability is low.
It is directly contacted with tested model surface by the measuring probe of rigidity and record X, Y, Z three-dimensional coordinate of gage outfit place measurement point that pin touches mechanical measurement, computer passes through sensor control survey head with certain step-length, certain line-spacing is measured and record automatically, utilizes computer graphic image reconstruction to go out dentognathic model according to the three-dimensional coordinate of each measurement point.It is more accurate that 3 D measuring instrument measures comparatively hand dipping, from the three-dimensional perspective reflection aspect of model, calculate easy, decrease the workload of gauger, but measuring probe possibly cannot reach and measures blind area and the measurement error that causes and the equipment and technology comparatively complex and expensive needed.
Non-contact measurement is through optical instrument and computer software reconstructs dentognathic model 3-D view, its fine structure is clear and legible, not only can rotate arbitrarily or translation for observing and each position on measurement model surface, the three-dimensional coordinate that also can complete arbitrfary point extracts, the Measurement and analysis of the items such as space any two points distance, arbitrarily angled, arc length and surface area, the index that hand dipping cannot be related to becomes possibility, and it is convenient, directly perceived, digital information can be stored in computer, is conducive to preservation and the management of model data.
In the research that craniofacial development is grown, by Royal medical college
the implantation body's radioactive method proposed is a kind of special experimental technique for the mankind, micro-for metal plantation nail is implanted in the skeleton of craniofacial region by it, nail and the strong bonded of jawbone are that follow-up observational study provides reliable reference, substantially increase accuracy, but be have wound operate therefore fail extensively to adopt clinically because of it.U.S. Broadbent in 1931 and German Hofranth have founded x-ray head locating measurement method, and the analysis of x-ray anterioposterior and lateral film becomes the important method that postgraduate's long hair is educated.Along with the development of computer technology, cephalometry develops into the exploration analyzed full-automatic image measurement at present from initial manual described point measurement, improve precision and efficiency, become the Important Platform of growth promoter research, but because there is X-ray film Structural superposition, fault in enlargement, the measurement point location problem such as inaccuracy and x-ray radiation in growth promoter research, do not widely use in the perspective longitudinal study of long-time large sample.
Present stage great majority research is the standard according to indivedual normal (tooth conjunction), and the tooth jaw plaster model filtering out Different age group normal (tooth conjunction) for a certain area measures as object of study, and then the rule of research tooth jaw growth promoter.The method is when utilizing every data of the dentognathic model of Different Individual, all ages and classes to carry out longitudinal study, zero difference between acquiescence Different Individual, only according to the single individuality of Standard Selection of normal (tooth conjunction), namely think that all samples are homogeneities, change is uniform and succession is consistent, and all selection samples are completely according to normal (tooth conjunction) rule growth.This method only just has statistical significance in the experiment of great amount of samples, if itself differ greatly between Finite Samples or individuality, measured data can not the growth promoter situation of actual response tooth jaw.
Summary of the invention
The object of the present invention is to provide a kind of digital measuring method of tooth jaw growth-development law, the method accuracy of measurement is high, and measurement result is reliable and stable, and measuring process is simple.
For achieving the above object, technical scheme of the present invention is: a kind of digital measuring method of tooth jaw growth-development law, Continuous Tracking also regularly obtains the dentognathic model of same children population, therefrom filter out the dentognathic model of normal (tooth conjunction), utilize tooth jaw palatine fold central incisor nipple mid point, left first palatine fold mid point, the dentognathic model of right first palatine fold mid point 3 different growth and development stages of the same individuality of position relationship registration, respectively with the dental arch curve variable quantity data that are reference measurement next stage jawbone of dentognathic model previous stage, finally carry out statistical analysis and determine this area's normal teeth jaw growth-development law.
Further, the digital measuring method of described tooth jaw growth-development law, carries out according to the following steps:
(1) from child's milk teeth period, the same children population of Continuous Tracking also obtains its dentognathic model every year, strictly filters out some normal (tooth conjunction) individuality, obtain the dentognathic model of same individual different year by the standard of normal (tooth conjunction);
(2) obtain normal (tooth conjunction) individual tooth jaw physical model according to a conventional method, obtain tooth jaw digital model by digital raster method;
(3) described tooth jaw digital model is processed and reconstructed, obtain tooth jaw threedimensional model;
(4) according to the tooth jaw threedimensional model of the different growth and development stage of same individuality, utilize 3-matic Top-Down Design software, carry out registration according to the principle that tooth jaw palatine fold central incisor nipple mid point, left first palatine fold mid point, right first palatine fold mid point 3 relative positions are stable, under the same coordinate system, set up the relative position relation of same individual different year dentognathic model;
(5) to go out about upper gnathode the reference point at two central incisors, lateral incisor, canine tooth, frist premolar, the second premolars, first molar place according to curvature analysis result queue, set up (tooth conjunction) plane of each stage dentognathic model;
(6) above each reference point is projected to (tooth conjunction) plane, sets up dental arch curve, according to the position measurement corresponding data of dental arch curve, every measurement all with previous stage dentognathic model for benchmark;
(7) statistical analysis is carried out to every data, determine this area's normal teeth jaw growth-development law.
Further, in step (3), described tooth jaw digital model is processed and reconstructed, obtain tooth jaw threedimensional model, comprise the steps:
3.1 data acquisitions and registration: the geometric coordinate data being obtained dentognathic model discretization of half-space surface point by spatial digitizer, from multiple visual angle, data acquisition is carried out to dentognathic model, then by multi-view data registration technique, coordinate unification is carried out to the data that each visual angle obtains;
3.2 data prediction: carry out pretreatment to the cloud data after registration, comprise impurity point, remove noise spot, data interpolation, data smoothing, data compaction, Data Segmentation etc., to ensure the quality of follow-up surface reconstruction;
3.3 curved-surface structure feature reconstructions: utilize pretreated cloud data, build threedimensional model to approach tooth jaw prototype by difference or matching;
3.4 Modifying model: the hole tiny on a small quantity that exists in the threedimensional model obtained is filled up, and carry out repairing, the process such as fairing, obtain complete tooth jaw three-dimensional digitalization model.
Further, what described dentognathic model was chosen is the model of same individuality at different growth and development stage, and to eliminate interindividual difference, ensure that same sample is homogeneity, Growth and development is uniform and succession is consistent.
Further, the registration of the dentognathic model of the different growth and development stage of same individuality is based on the stable principle of tooth jaw palatine fold central incisor nipple mid point, left first palatine fold mid point, right first palatine fold mid point 3 relative positions.
Further, the measurement of described dentognathic model growth rhythm related data is that the dental arch curved surface set up in 3-matic Top-Down Design software carries out, and before every measurement all, a model is benchmark.
Compared to prior art, tool of the present invention has the following advantages:
1) follow the tracks of from milk teeth period child, after milk teeth period for the tooth phase, preventative rescue and barrier to rescue be the pith of orthodontic treatment, it can block further developing for tooth phase child's mistake (tooth conjunction) deformity, and guide the normal growth in (tooth conjunction), jaw, face, reduce the harmful effect that wrong (tooth conjunction) deformity causes infantile psychology, (tooth conjunction) for permanent dention sets up provides basic and convenient.Therefore to the research for the tooth phase, there is important clinical reference and directive significance.
2) carry out related data measurement according to based on the dentognathic model of the different growth and development stage of same individuality, to eliminate interindividual difference, ensure that data are true and reliable.
3) on same individuality different growth and development stage dentognathic model coordinate unification, registration is carried out according to the principle that upper jaw palatine fold central incisor nipple mid point, left first palatine fold mid point, right first palatine fold mid point 3 relative positions are stable, the method is simple, and reliability is high.
4) measuring method of this tooth jaw growth-development law is both by judging that the Dentofacial structure feature of same year age group carries out horizontal survey after normal (tooth conjunction) the colony's Average value compare of contemporaneity, sample again by one or several age group carries out longitudinal comparison at the Dentofacial structure of different developmental stage, reflect the growth tendency of individual tooth jawbone, the growth change of assessment tooth-alveolus position and hard and soft tissue, analyzes wrong (tooth conjunction) ter mechanism, position and degree.
5) dentognathic model initial data is preserved with tri patch surface mesh model, and in 3-matic software, realize every data accurately measure, dentognathic model initial data is stored in computer, be beneficial to the preservation of model data, call and manage, the distortion avoiding tooth jaw plaster model to cause due to long-term storage and wearing and tearing.Simultaneously, not only can rotate arbitrarily in 3-matic software or translation for observing and measuring each position on dentognathic model surface, the three-dimensional coordinate that also can complete arbitrfary point extracts, the Measurement and analysis of the items such as space any two points distance, arbitrarily angled, arc length and surface area, realize stable, measure fast, accurately.
Accompanying drawing explanation
Fig. 1 is the flow chart of the embodiment of the present invention.
Fig. 2 is dentognathic model superimposed triangular schematic diagram in the embodiment of the present invention.
Fig. 3 is each time dentognathic model registration schematic diagram in the embodiment of the present invention.
Fig. 4 is that in the embodiment of the present invention, on dentognathic model, reference point chooses schematic diagram.
Fig. 5 is dentognathic model dental arch curve contrast schematic diagram in the embodiment of the present invention.
Detailed description of the invention
The digital measuring method of tooth jaw growth-development law of the present invention, Continuous Tracking also regularly obtains the dentognathic model of same children population, therefrom filter out the dentognathic model of normal (tooth conjunction), utilize the dentognathic model of tooth jaw palatine fold central incisor nipple mid point, left first palatine fold mid point, right first palatine fold mid point 3 different growth and development stages of the same individuality of position relationship registration, respectively with the dental arch curve variable quantity data that are reference measurement next stage jawbone of dentognathic model previous stage, finally carry out statistical analysis and determine this area's normal teeth jaw growth-development law.Here it should be noted that, above-mentioned (tooth conjunction) represents a word, be made up of " tooth " and " conjunction ", the left side is " tooth ", and the right is " conjunction ", is a distinctive word in stomatology, owing to cannot be exported by input method, therefore, use for reference the general literary style in this field list of references, adopt (tooth conjunction) to represent this word.
Concrete, as shown in Figure 1, the digital measuring method of tooth jaw growth-development law of the present invention, carries out according to the following steps:
(1) from child's milk teeth period, the same children population of Continuous Tracking also obtains its dentognathic model every year, strictly filters out some normal (tooth conjunction) individuality, obtain the dentognathic model of same individual different year by the standard of normal (tooth conjunction);
(2) (namely filled in mouth with alginate, obtain the former of alveolus, then fill former with Gypsum Fibrosum) the tooth jaw physical model obtaining normal (tooth conjunction) individuality by odontologist according to a conventional method, obtain tooth jaw digital model by digital raster method; Tooth jaw digital model is obtained by digital raster method, its ultimate principle is: the surface of the optical grating projection of coding structure to Gypsum Fibrosum physical model, grating fringe can bend along with the height relief of solid object surface and be out of shape, deformed grating striped through body surface reflection generation contains the surface shape information of object, then by two high resolution CCD cameras according to Binocular Vision Principle, synchronously absorb the grating fringe of distortion from two different angles, carry out analyzing the three-dimensional profile cloud data that can obtain object to the deformed grating of different directions afterwards;
(3) described tooth jaw digital model is processed and reconstructed, obtain tooth jaw threedimensional model, comprise the steps:
3.1 data acquisitions and registration: the geometric coordinate data being obtained dentognathic model discretization of half-space surface point by spatial digitizer, carried out data acquisition from multiple visual angle to model, then carry out coordinate unification by multi-view data registration technique to the data that each visual angle obtains;
3.2 data prediction: obtain plaster model surface data and cloud data by said method, due to the impact of the inherent shortcoming of equipment, measuring method, piece surface, bad point and noise spot is had in the data collected, this point and patch around thereof may be made to depart from former curved surface, so the overall cloud data after the registration of reply acquisition carries out pretreatment.Pretreatment work comprises: remove impurity point, remove noise spot, data interpolation, data smoothing, data compaction, Data Segmentation etc., to ensure the quality of follow-up surface reconstruction;
3.3 curved-surface structure feature reconstructions: architectural feature reconstruct is the cloud data utilizing tooth jaw surface, builds an approximate model approach tooth jaw prototype by difference or matching.A kind of curve reestablishing method be first by data point by interpolation or approach and fit to curve, curve component is become curved surface by recycling molder tool; Another kind method is then directly to the matching of measurement data points march dough sheet, then through having operated the structure of architectural feature model to the transition, splicing, cutting etc. of patch;
3.4 Modifying model: the threedimensional model that curved-surface structure feature reconstruction obtains exists tiny on a small quantity hole, must fill up hole, then carry out repairing, the process such as fairing, obtain complete tooth jaw Gypsum Fibrosum three-dimensional digitalization model;
(4) according to the tooth jaw threedimensional model of the different growth and development stage of same individuality, utilize 3-matic Top-Down Design software, carry out registration according to the principle that tooth jaw palatine fold central incisor nipple mid point, left first palatine fold mid point, right first palatine fold mid point 3 relative positions are stable, under the same coordinate system, set up the relative position relation of same individual different year dentognathic model;
(5) to go out about upper gnathode the reference point at two central incisors, lateral incisor, canine tooth, frist premolar, the second premolars, first molar place according to curvature analysis result queue, set up (tooth conjunction) plane of each stage dentognathic model;
(6) above each reference point is projected to (tooth conjunction) plane, sets up dental arch curve, according to the position measurement corresponding data of dental arch curve, every measurement all with previous stage dentognathic model for benchmark;
(7) statistical analysis is carried out to every data, inquire into the internal relation of every data target, determine this area's normal teeth jaw growth-development law.
What described dentognathic model was chosen is the model of same individuality at different growth and development stage, and to eliminate interindividual difference, ensure that same sample is homogeneity, Growth and development is uniform and succession is consistent.
The registration of the dentognathic model of the different growth and development stage of same individuality is based on the stable principle of tooth jaw palatine fold central incisor nipple mid point, left first palatine fold mid point, right first palatine fold mid point 3 relative positions.
The measurement of described dentognathic model growth rhythm related data is that the dental arch curved surface set up in 3-matic Top-Down Design software carries out, and before every measurement all, a model is benchmark.
Below in conjunction with specific embodiment, the invention will be further described.
In the present embodiment, the digital measuring method of tooth jaw growth-development law of the present invention, carries out according to the following steps:
(1) milk teeth period children population is followed the tracks of, the information such as itemized record name, age, sex.After milk teeth period is quick phase of tooth (tooth conjunctions) and jaw growth for the tooth phase (6-12 year), is also the critical period of tooth, maxillofacial development.During this period, tooth and face are all constantly grown, and from the formation being erupted into mixed dentition of first permanent teeth, then sting (tooth conjunction) relation to permanent dentition foundation, tooth jaw and dental arch all need to experience complicated change procedure.In this process, set up and sting (tooth conjunction) relation normally, not only with the normal development of tooth, normal eruption and normally put in place relevant, also depend on the normal development of alveolar bone, jawbone and whole, cranium, simultaneously also by the impact of the factors such as heredity, metabolism, nutrition, endocrine and peripheral environment, so tooth (tooth conjunction) growth is a complex process of body and external environment factors joint effect thereof.Above factors all can impact the growth promoter of tooth and dental arch, thus easily causes the generation of mistake (tooth conjunction) deformity.Replacing the tooth phase, preventative rescue and barrier to rescue be the pith of orthodontic treatment, it can block further developing for tooth phase child's mistake (tooth conjunction) deformity, and guide the normal growth in (tooth conjunction), jaw, face, reduce the harmful effect that wrong (tooth conjunction) deformity causes infantile psychology, the foundation for the tooth jaw of permanent dention provides basic and convenient.Judge that stinging (tooth conjunction) relation for the tooth phase not only will carry out observation and analysis from form and functionally, and deep understanding to be had to the growth developmental characteristic such as jawbone, dental arch, therefore the present invention has important clinical reference and directive significance from beginning one's study for the tooth phase.
(2) screen normal (tooth conjunction) individuality and turn over tooth jaw plaster model processed.Normally (tooth conjunction) choice criteria is: face is symmetrical, without deformity, positive side profile is coordinated, without obvious prolapse or retrude, lip function is good, mixed dentition and denture is complete, first molar and canine tooth are indifference relation, cover (tooth conjunctions) covers normal, upper lower jaw center line and align, tooth arrangement is substantially neat, without crowded and gap, complete without orthodontic treatment history, tooth body, there is no large-area reparation, without the nearly neutral plane abrasion far away of serious tooth, without conical teeth, the exception of the dental morphologies such as fused tooth and number.Individuality is closed to each normal (tooth conjunction) and chooses sizeable pallet, upper lower impression is produced with alginate impression material, normally the production standard of (tooth conjunction) dentognathic model is: denture is complete, accurately, clear, bubble-free, comprise the part such as tooth, dental arch, base bone, mucobuccal fold, labial frenum, neat, attractive in appearance and (tooth conjunction) situation of patient can be reflected, finally edge trimming is carried out to model, the correction record model of model base formation standard parallel with plane numbering preservation.
(3) three dimensional data collection.High-precision three-dimensional digital raster method is utilized to scan the cloud data obtaining plaster model surface, reverse engineering software process is used to scan the cloud data obtained, three-dimensional grid model is obtained after gridding, owing to inevitably running into the defect such as noise, scan blind spot in the measurements, need to carry out the process such as fairing, repairing to the model obtained, finally obtain more satisfactory three-dimensional digital model.Specifically comprise following four steps: the geometric coordinate data being obtained dentognathic model discretization of half-space surface point by spatial digitizer, from multiple visual angle, data acquisition is carried out to model, then by multi-view data registration technique, coordinate unification is carried out to the data that each visual angle obtains; Plaster model surface data and cloud data is obtained by said method, due to the impact of the inherent shortcoming of equipment, measuring method, piece surface, bad point and noise spot is had in the data collected, this point and patch around thereof may be made to depart from former curved surface, so the overall cloud data after the registration of reply acquisition carries out pretreatment.Pretreatment work comprises: remove impurity point, remove noise spot, data interpolation, data smoothing, data compaction, Data Segmentation etc., to ensure the quality of follow-up surface reconstruction; Surface reconstruction is carried out to the overall cloud data through date processing, utilize the cloud data on tooth jaw surface, build an approximate model by difference or matching and approach tooth jaw prototype, then through having operated the structure of architectural feature model to the transition, splicing, cutting etc. of patch; There is tiny on a small quantity hole in the threedimensional model that curved-surface structure feature reconstruction obtains, must fill up hole, then carry out repairing, the process such as fairing, obtain complete tooth jaw Gypsum Fibrosum three-dimensional digitalization model.
(4) registration of same individual different year model.On Digital Three-Dimensional, the overlap of gnathode depends on stable anatomical reference position, palatine fold is the distinctive anatomical structure of the upper jaw, a forefathers' large quantity research prompting palate wrinkle ancient piece of jade, round, flat and with a hole in its centre, especially the 3rd palatine fold, change in location in growth promoter and orthodontic treatment process in sagittal direction and vertical direction is very little, can think stable.The stable principle of above gnathode palatine fold central incisor nipple mid point, left first palatine fold mid point, right first palatine fold mid point 3 relative positions carries out Registration of Measuring Data, the unification of same individual Different growth phases dentognathic model relative position relation under realizing coordinate system.First on dentognathic model, curvature analysis is carried out, according to the result of curvature analysis respectively at tooth jaw palatine fold central incisor nipple place, left first palatine fold place, right 3, first palatine fold place determine that point that curvature is larger is as central incisor nipple mid point, left first palatine fold mid point, right first palatine fold mid point, connect central incisor nipple mid point, left first palatine fold mid point, right 3, first palatine fold mid point structure projected triangle respectively, above-mentioned delta-shaped region is projected in dentognathic model, as shown in Figure 2, the superimposed triangular region corresponding with dentognathic model is set up.In like manner, construct the overlapping region of all the other all ages and classes stage dentognathic models, the overlapping region of above 1 year model is that benchmark carries out global registration respectively, and the registration finally obtaining all ages and classes stage each model is always schemed, as Fig. 3.
(5) Selection Model reference point and set up each model close plane.Curvature analysis is carried out to each dentognathic model, the three-dimensional dentognathic model in wherein deciduous teeth stage chooses 10 reference points alternately according to the result of curvature analysis: left and right central incisor incisxal edge mid point is respectively the 1st, 2 points, left and right sides incisor incisxal edge mid point is respectively the 3rd, 4 points, left and right canine tooth cusp is respectively the 5th, 6 points, frist premolar cheek side, left and right cusp is respectively the 7th, 8 points, and premolars cheek side, left and right second cusp is respectively the 9th, 10 points.Submit mutual election at the three-dimensional dentognathic model in permanent teeth stage and get 12 reference points: left and right central incisor incisxal edge mid point is respectively the 1st, 2 points, left and right sides incisor incisxal edge mid point is respectively the 3rd, 4 points, left and right canine tooth cusp is respectively the 5th, 6 points, frist premolar cheek side, left and right cusp is respectively the 7th, 8 points, left and right the second premolars cheek side cusp is respectively the 9th, 10 points, left and right first molar buccal groove mid point is respectively the 11st, 12 points, reference point determines each teeth model bow face, as Fig. 4 with trend surface analysis method after choosing again.
(6) projection obtains dental arch curve.Self threedimensional model is chosen 10 or 12 reference points are mapped on the dental arch curved surface of self model, and dental arch curve is obtained with fitting of a polynomial mapping point on this two dimensional surface, in like manner, again self threedimensional model is chosen 10 or 12 reference points are mapped on the dental arch curve face of a upper model, matching mapping point obtains the Article 2 dental arch curve of this dental arch curved surface, as Fig. 5.
(7) surveying record statistical analysis.On above-mentioned dental arch curved surface, measure following data respectively: need to measure arch width and arch length in dentognathic model self attributes, wherein arch width comprises dental arch leading portion width and buccal segment width, distance between dental arch leading portion width and upper jaw both sides canine tooth cusp, buccal segment width and upper jaw both sides first molar buccal groove mid point spacing, arch length comprises segment length and buccal segment length before dental arch, before dental arch segment length namely with line between the canine tooth cusp of upper jaw both sides for bottom line, in near by central incisor contact point to bottom line make the distance of vertical line, buccal segment length namely with line between the first molar buccal groove mid point of upper jaw both sides for bottom line, in near by central incisor contact point to bottom line make the distance of vertical line, wherein the nearly middle contact point of central incisor can be determined according to left and right central incisor incisxal edge mid point, the measurement of arch length first can determine this plane by the nearly middle contact point of central incisor and 3, left and right sides first molar buccal groove mid point, and make corresponding vertical line on that plane and measure its length, on the measurement of comparison in dentognathic model adjacent time, following 12 groups of data need be measured: upper gnathode left and right central incisor incisxal edge mid point is respectively relative to the distance between a upper model central incisor relevant position point, left and right sides incisor incisxal edge mid point is respectively relative to the distance in a upper model between the point of tooth relevant position, side, left and right canine tooth cusp is respectively relative to the distance in a upper model between the point of canine tooth relevant position, left and right first, two premolars cheek side cusps are respectively relative to the distance in a upper model between the point of premolars relevant position, left and right first molar buccal groove mid point is respectively relative to the distance between a upper model first molar relevant position point.If first molar does not have eruption in above-mentioned distance, without the need to measuring corresponding data.Repeat this step, measure the corresponding data of each model of the different growth and development stage of same individuality.Repeat said method is carried out in step (2) ~ (7) measurement for each individuality, obtain the initial data data of tooth jaw Growth and development, finally carry out the rule that statistical analysis sums up this area normal person tooth jaw growth promoter.
Be more than preferred embodiment of the present invention, all changes done according to technical solution of the present invention, when the function produced does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (2)
1. a digital measuring method for tooth jaw growth-development law, is characterized in that: Continuous Tracking also regularly obtains the dentognathic model of same children population, therefrom filters out normal
dentognathic model, utilize the dentognathic model of tooth jaw palatine fold central incisor nipple mid point, left first palatine fold mid point, right first palatine fold mid point 3 different growth and development stages of the same individuality of position relationship registration, respectively with the dental arch curve variable quantity data that are reference measurement next stage jawbone of dentognathic model previous stage, finally carry out statistical analysis and determine somewhere normal teeth jaw growth-development law; Specifically carry out according to the following steps:
(1) from child's milk teeth period, the same children population of Continuous Tracking also obtains its dentognathic model every year, by normal
standard strictly filter out normally some
individuality, obtains the dentognathic model of same individual different year;
(2) obtain according to a conventional method normally
individual tooth jaw physical model, obtains tooth jaw digital model by digital raster method;
(3) described tooth jaw digital model is processed and reconstructed, obtain tooth jaw threedimensional model;
(4) according to the tooth jaw threedimensional model of the different growth and development stage of same individuality, utilize 3-matic Top-Down Design software, carry out registration according to the principle that tooth jaw palatine fold central incisor nipple mid point, left first palatine fold mid point, right first palatine fold mid point 3 relative positions are stable, under the same coordinate system, set up the relative position relation of same individual different year dentognathic model;
(5) to go out about upper gnathode the reference point at two central incisors, lateral incisor, canine tooth, frist premolar, the second premolars, first molar place according to curvature analysis result queue, set up each stage dentognathic model
plane;
(6) above each reference point is projected to
plane, sets up dental arch curve, according to the position measurement corresponding data of dental arch curve, every measurement all with previous stage dentognathic model for benchmark;
(7) statistical analysis is carried out to every data, determine somewhere normal teeth jaw growth-development law.
2. the digital measuring method of a kind of tooth jaw growth-development law according to claim 1, is characterized in that: in step (3), processes described tooth jaw digital model and reconstructs, and obtains tooth jaw threedimensional model, comprises the steps:
3.1 data acquisitions and registration: the geometric coordinate data being obtained dentognathic model discretization of half-space surface point by spatial digitizer, from multiple visual angle, data acquisition is carried out to dentognathic model, then by multi-view data registration technique, coordinate unification is carried out to the data that each visual angle obtains;
3.2 data prediction: carry out pretreatment to the cloud data after registration, comprise impurity point, remove noise spot, data interpolation, data smoothing, data compaction, Data Segmentation, to ensure the quality of follow-up surface reconstruction;
3.3 curved-surface structure feature reconstructions: utilize pretreated cloud data, build threedimensional model to approach tooth jaw prototype by difference or matching;
3.4 Modifying model: the hole tiny on a small quantity that exists in the threedimensional model obtained is filled up, and carry out repairing, fairing processing, obtain complete tooth jaw three-dimensional digitalization model.
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