CN110147647A - Tooth jawbone 3-dimensional digital modeling method based on remporomandibular joint stability - Google Patents
Tooth jawbone 3-dimensional digital modeling method based on remporomandibular joint stability Download PDFInfo
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Abstract
The present invention is based on the tooth jawbone 3-dimensional digital modeling methods of remporomandibular joint stability, comprising the following steps: is scanned to obtain patient's tooth jaw three-dimensional digital model with spatial digitizer；Take patient's head in the normotopia of centric relation position and side position x-ray image；Construct virtual x-ray projection model and reference frame；It adjusts position and the angle of the upper lower tooth jaw of tooth jaw three-dimensional digital model respectively in virtual x-ray projection model, calculates two-dimentional x-ray projected image；The two-dimentional x-ray projected image of upper lower tooth jaw is registrated with actual head normotopia x-ray image and side position x-ray image, records upper parameter of the lower tooth jaw in reference frame when optimal registration；Its remporomandibular joint spatial positional information of reverse；Upper lower tooth jaw three-dimensional digital model information when with optimal registration reconstructs tooth jaw three-dimensional digital model；Its tooth jaw masticatory movement model and mechanics decomposition model are further constructed to three-dimensional digital model, provide virtual operation function, operation estimation function according to model.
Description
Technical field
The present invention relates to mouth cavity orthodontic digital technology, in particular to a kind of tooth jaw based on remporomandibular joint stability
Bone 3-dimensional digital modeling method.
Background technique
Malocclusion is one of high-incidence disease of the department of stomatology, can cause bad shadow to personal oral health and appearance appearance
It rings, serious person will cause oral cavity function exception.Currently, correction-orthognatic surgery is the main means for treating malocclusion.
Ideal correction operation is usually directed to following link: 1, the external manifestation by observation patient's malocclusion and inquiry
Its family's related history is to do error jaw type and the relevant preliminary judgement of heredity medication history；2, to patient impose both hands help method or
Autonomous retrogressing method sets temporomandibular joint (Temporomandibular Joint, referred to as " TMJ ") in centric relation position, together
When its TMJ stability judged by observation and palpation, and the occluding relation using wax disk(-sc) record at this time；3, patient's tooth jaw gypsum is taken
Model and x-ray head just/side position image, the physiological status such as analysis tooth, root of the tooth, jawbone, joint；4, in summary information provides
Diagnostic result simultaneously formulates operation plan.
TMJ is the growth and development center of mandibular, and the convergent force of masseter, supports spirit when major function is carrying occlusion
Changeable mandibular movement living, structure is close with occluding relation, even more closely related with orthodontic treatment.But in conventional diagnosis and treatment process
In, most of orthodontist formulate medical scheme in ignore completely to TMJ stability the considerations of.One the reason is that many corrections
Starting point be to improve facial appearance, do not recognize correction and TMJ be closely connected and TMJ stability is given birth to for a long time in patient
Importance in work.Second the reason is that there is presently no ready-made technological means, and doctor can be allowed to formulate in orthodontic treatment plan
The stability of accurate consideration TMJ in the process.The partial higher orthodontist TMJ stable character determining by palpation and observation
State, formulated for diagnostic analysis and operation plan increase it is important it is qualitative consider, however, during actual row's tooth, not
Have a kind of effective method or tool come quantitative measurement and with reference to TMJ stable state and provided for row's tooth operation and refer to or refer to
It leads, i.e., practical row's tooth operation can not almost determine influence to TMJ stability and TMJ stability requirement to the limit of row's tooth operation
System.In addition, dental information, jaw face information and TMJ status information derive from different models and technology, do not merged precisely,
Doctor can only by virtue of experience link together them with the imagination, to carry out analyzing and diagnosing and guided operation.This requires doctor to have
There are experience level abundant and stable subjective judgement, this significantly increases the uncertainty and randomness of operation.
With the development of image technology and computer technology, three-dimensional (Three-dimensional is referred to as " the 3D ") number of correction
Word model is widely studied and applied, and mathematical model compensates for the deficiency of traditional analysis diagnostic method to a certain extent, for doctor
Suffer from communication, surgical simulation and navigation etc. and provides effective means and the new visual field.The weight of mouth cavity orthodontic three-dimensional digital model at present
Building thinking can be divided mainly into two aspects: the 1, three-dimensional reconstruction based on CBCT technology；2, based on x-ray head just/side position image three
Dimension is rebuild, that is, uses x-ray head image as reference, the three-dimensional digital model of the molded tissue blocks such as tooth, jawbone is registrated therewith
And it rebuilds.
CT technology can reproduce the three-dimensional configuration and spatial information of the tissues such as jawbone, joint, root of the tooth, tooth, be to work as prosopyle
The optimum data source of chamber correction three-dimensional digital model, but presently relevant threedimensional model is to close from the occlusion of tooth substantially
System, face appearance etc. consider, consider root information and its arrangement mode completely, especially ignore TMJ function and its
Stability is the key factor of correction, increases the risk that patient is engaged problem (such as TMJ inflammation) for a long time, more practical
It is that CT technology itself is intrusive imaging, large dosage of X-ray has high Radiation risk, and its equipment price and film making valence
Lattice are expensive, can not be equipped with and popularize substantially in common dental clinic at present, and the mathematical model application based on this technology is also difficult to
Landing.
Based on x-ray head just/three-dimensional reconstruction of side position image avoids the use of CT technology, x-ray cephalometry instrument is universal
Degree is high, the standard configuration of substantially common dental clinic, so the three-dimensional digital model based on this technology has universal environment well.
X-ray head image is two-dimensional, although can provide comprehensively and accurate tooth, jawbone, joint without three-dimensional spatial information
Etc. institutional frameworks plane geometry of the reservoir, be good marker, can be used as other 3-dimensional digital moulds in three-dimensional reconstruction
The object of block registration, and reverse is come with this and determines itself coordinate position and spatiality, it realizes and quickly rebuilds.But due to X
Skull image can not provide the three-dimensional configuration and spatial relationship of institutional framework, and TMJ can not be judged especially from bidimensional image
The stability of structure, so the existing model based on this technology does not all bring the state of TMJ and its stability into modeling
The problem of in consideration, this largely affects the effect of mouth cavity orthodontic, brings long-term occlusion aspect to patient.
In conclusion the three-dimensional digital model based on CT technology, since its high radiation risk and expensive price are can be pre-
The future seen also is difficult to popularize, and really can not bring help for the diagnosis and treatment of clinic orthodontic operation；And it is based on x-ray head image reconstruction
Three-dimensional digital model, have in equipment and promote basis, but all do not bring the state of TMJ and its stability into modeling
In consideration.
Summary of the invention
The purpose of the present invention is in view of the above-mentioned drawbacks of the prior art, providing a kind of based on remporomandibular joint stability
Tooth jawbone 3-dimensional digital modeling method, this method is to be established based on x-ray head image and tooth jaw three-dimensional data with TMJ stability
For the tooth jawbone three-dimensional digital model of core, foundation is provided for the auxiliary intelligent diagnostics and Surgical correction of mouth cavity orthodontic.
The present invention to achieve the above object the technical solution adopted is that: a kind of tooth jawbone based on remporomandibular joint stability
3-dimensional digital modeling method, comprising the following steps: step 1: patient's tooth jaw plaster cast is taken, and plaster cast is swept using three-dimensional
It retouches instrument to scan to obtain its tooth jaw three-dimensional digital model, or directly obtains tooth jaw three-dimensional digital model using scanner in mouth；Step
Rapid 2: orthodontist sets temporomandibular joint in centric relation position, takes patient's head normotopia x-ray image and side position x-ray image；
Step 3: with reference to the space geometry relationship and image-forming mechanism of x-ray head shadow instrument, constructing virtual x-ray projection model and its reference coordinate
System；Step 4: in virtual x-ray projection model, arriving two-dimensional x-ray projection imaging algorithm using based on three-dimensional, adjust tooth jaw respectively
The position of the upper and lower tooth jaw of three-dimensional digital model and angle calculate the two-dimentional x-ray perspective view under its each angles and positions state
Picture；Step 5: registration Algorithm is based on, by actual head in the two-dimentional x-ray projected image of tooth jaw upper and lower in step 4 and step 2
Normotopia x-ray image and side position x-ray image are registrated, its optimal registration is taken, and are recorded upper and lower tooth jaw at this time respectively and sat in reference
Position, directioin parameter in mark system；Step 6: being imaged using patient's head normotopia x-ray image and side position x-ray image as virtual x-ray
The imaging results of model, its remporomandibular joint spatial positional information of reverse；Step 7: with upper and lower when optimal registration in step 5
Space coordinate, directioin parameter and the remporomandibular joint spatial positional information of tooth jaw three-dimensional digital model, in three-dimensional reconstruction software
Reconstruct tooth jaw three-dimensional digital model；Step 8: in three-dimensional reconstruction software, determine remporomandibular joint spatial position, and as it is upper,
The fulcrum of mandibular movement constructs the three-dimensional digital model that upper and lower jaw can move up and down, and then utilizes FInite Element, and building should
The mechanics decomposition model of three-dimensional digital model；Step 9: what it is based on building includes tooth jaw form, tooth jaw motor pattern and its mechanics
The stable tooth jaw three-dimensional digital model of the remporomandibular joint of model, provides virtual operation, operation estimation function.
The present invention is based on the tooth jawbone 3-dimensional digital modeling methods of remporomandibular joint stability to have the following beneficial effects:
1) existing correction three-dimensional digital model is mostly based on CT technology, and the technology is since CT equipment is at high price and has high radiation
Risk is in a foreseeable future difficult to be popularized in common clinic, benefits many patients.The present invention fully takes into account existing tooth
The device configuration of section clinic does not need additionally to purchase other highly sophisticated devices, it is only necessary to increase a price it is not high three
Scanner is tieed up, for the 3-D scanning of tooth jaw plaster cast, this is conducive to of the invention commonly used in terms of economic input.
2) existing correction three-dimensional digital model some be based on x-ray head image, tooth jaw three-dimensional data and general jaw
Bone model is rebuild, but not or TMJ stability can not be introduced into model in reconstruction process, brings long-term occlusion for patient
Uncomfortable risk.The present invention is based on x-ray head images and tooth jaw three-dimensional data to rebuild the tooth jaw 3-dimensional digital with TMJ stability
Model, and analyzed by meshing functionss simulation and distribution of force, three-dimensional view angle and occlusion degree can be provided for virtual row's tooth operation
Analysis, it is even more important that the upper and lower jaw and its spatial relationship that the present invention is rebuild are based on the x-ray head under TMJ stable state
Image, that is to say, that the upper lower jaw rebuild contains considering for TMJ stability, has the guarantee of TMJ stability, this is just
So that row's tooth process in later period need not consider further that the state of TMJ, because TMJ stable state has been quantized in mathematical model,
As long as the position of the fulcrum of masticatory movement does not change above and below upper and lower jaw, TMJ stable state would not change.
With reference to the accompanying drawings and examples to the present invention is based on the modelings of the tooth jawbone 3-dimensional digital of remporomandibular joint stability
Method is further described.
Detailed description of the invention
Fig. 1 is the flow chart of the tooth jawbone 3-dimensional digital modeling method the present invention is based on remporomandibular joint stability.
Specific embodiment
As shown in Figure 1, a kind of tooth jawbone 3-dimensional digital modeling method based on remporomandibular joint stability of the present invention, including
Following steps:
Step 1: taking patient's tooth jaw plaster cast, and plaster cast is scanned to obtain its tooth jaw 3-dimensional digital using spatial digitizer
Model, or directly tooth jaw three-dimensional digital model is obtained using scanner in mouth；
Step 2: orthodontist is by adjusting setting temporomandibular joint (TMJ) under centric relation position, centric relation position, that is, temporo
Jaw joint is in stable state, takes patient's head normotopia x-ray image and side position x-ray image；
Step 3: with reference to the space geometry relationship and image-forming mechanism of x-ray head shadow instrument, constructing virtual x-ray projection model, and its reference
Coordinate system constructs virtual x-ray cephalometry instrument coordinate system with specific reference to x-ray head shadow instrument, and using Ray-sum Algorithm,
Radon transform or Siddon ' s Algorithm scheduling algorithm constructs virtual projection imaging mechanism；
Step 4: in virtual x-ray projection model, arriving two-dimensional x-ray projection imaging algorithm using based on three-dimensional, adjust tooth respectively
The position of the upper and lower tooth jaw of jaw three-dimensional digital model and angle calculate the two-dimentional x-ray perspective view under its each angles and positions state
Picture；
Step 5: being based on registration Algorithm, registration Algorithm includes dimension rotation invariant features point registration Algorithm, gradient mutual information registration
Method, correlation registration method, principal component registration method or iteration closest approach essence are registrated method, by the two-dimentional x-ray of tooth jaw upper and lower in step 4
Projected image is registrated with head normotopia x-ray image actual in step 2 and side position x-ray image, takes its optimal registration, and divide
Position in reference frame of upper and lower tooth jaw at this time, directioin parameter are not recorded；
Step 6: using patient's head normotopia x-ray image in step 2 and side position x-ray image as the imaging of virtual x-ray imaging model
As a result, according to projection path and projection imaging algorithm used, its remporomandibular joint (TMJ) spatial positional information of reverse；
Step 7: under the space coordinate of the upper and lower tooth jaw three-dimensional digital model in step 5 when optimal registration, directioin parameter and temporo
Jaw joint (TMJ) spatial positional information reconstructs tooth jaw three-dimensional digital model in three-dimensional reconstruction software；
Step 8: in three-dimensional reconstruction software, determining the spatial position remporomandibular joint (TMJ), and the branch as the movement of upper and lower jaw
Point constructs the three-dimensional digital model that upper and lower jaw can move up and down, and then utilizes FInite Element, constructs the three-dimensional digital model
Mechanics decomposition model；
Step 9: the stable tooth of the remporomandibular joint including tooth jaw form, tooth jaw motor pattern and its mechanical model based on building
Jaw three-dimensional digital model provides virtual operation, operation estimation function by tooth jaw three-dimensional digital model.Utilize three-dimensional segmentation algorithm reality
The model segmentation of existing tooth, and virtual row's tooth operation is carried out, after the completion of arranging tooth, force analysis can utilize the mechanics point of step 8
Solution model is calculated, and the analysis of occlusion degree can pass through the contact point quantity and contact area degree of progress of the upper mandibular teeth of measurement
Amount.
The present invention is based on x-ray head images and tooth jaw three-dimensional data to rebuild the tooth jaw 3-dimensional digital mould with TMJ stability
Type, and analyzed by meshing functionss simulation and distribution of force, three-dimensional view angle and occlusion degree point can be provided for virtual row's tooth operation
Analysis, the upper and lower jaw and its spatial relationship of reconstruction are the upper lower jaws rebuild based on the x-ray head image under TMJ stable state
Considering for TMJ stability is contained, there is TMJ stability to guarantee, need not consider further that the state of TMJ in row's tooth process in later period,
Foundation is provided for the auxiliary intelligent diagnostics and Surgical correction of mouth cavity orthodontic.
Claims (1)
1. a kind of tooth jawbone 3-dimensional digital modeling method based on remporomandibular joint stability, which is characterized in that including following step
It is rapid:
Step 1: taking patient's tooth jaw plaster cast, and plaster cast is scanned to obtain its tooth jaw 3-dimensional digital using spatial digitizer
Model, or directly tooth jaw three-dimensional digital model is obtained using scanner in mouth；
Step 2: orthodontist sets temporomandibular joint in centric relation position, takes patient's head normotopia x-ray image and side position x-ray
Image；
Step 3: with reference to the space geometry relationship and image-forming mechanism of x-ray head shadow instrument, constructing virtual x-ray projection model, and its reference
Coordinate system；
Step 4: in virtual x-ray projection model, arriving two-dimensional x-ray projection imaging algorithm using based on three-dimensional, adjust tooth respectively
The position of the upper and lower tooth jaw of jaw three-dimensional digital model and angle calculate the two-dimentional x-ray perspective view under its each angles and positions state
Picture；
Step 5: registration Algorithm is based on, by actual head in the two-dimentional x-ray projected image of tooth jaw upper and lower in step 4 and step 2
Cranium normotopia x-ray image and side position x-ray image are registrated, and take its optimal registration, and record upper and lower tooth jaw at this time respectively and referring to
Position, directioin parameter in coordinate system；
Step 6: using patient's head normotopia x-ray image and side position x-ray image as the imaging results of virtual x-ray imaging model, instead
Seek its remporomandibular joint spatial positional information；
Step 7: under the space coordinate of the upper and lower tooth jaw three-dimensional digital model in step 5 when optimal registration, directioin parameter and temporo
Jaw joint space location information reconstructs tooth jaw three-dimensional digital model in three-dimensional reconstruction software；
Step 8: in three-dimensional reconstruction software, determining remporomandibular joint spatial position, and the fulcrum as the movement of upper and lower jaw, structure
The three-dimensional digital model that upper and lower jaw can move up and down is built, FInite Element is then utilized, constructs the mechanics of the three-dimensional digital model
Decomposition model；
Step 9: the stable tooth of the remporomandibular joint including tooth jaw form, tooth jaw motor pattern and its mechanical model based on building
Jaw three-dimensional digital model provides virtual operation, operation estimation function.
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| CN111613332A (en) * | 2020-05-22 | 2020-09-01 | 中国人民解放军空军军医大学 | Method for evaluating occlusion meshing degree based on scanned image and finite element model |
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| WO2023246461A1 (en) * | 2022-06-20 | 2023-12-28 | 杭州朝厚信息科技有限公司 | Method for generating simulated lateral views after orthodontic treatment |
| CN114998349A (en) * | 2022-08-04 | 2022-09-02 | 首都医科大学宣武医院 | Digital three-dimensional measurement evaluation method for temporomandibular joint |
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