CN112869894B - Design method, preparation system and preparation method of shell-shaped tooth appliance - Google Patents
Design method, preparation system and preparation method of shell-shaped tooth appliance Download PDFInfo
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- CN112869894B CN112869894B CN201911210400.4A CN201911210400A CN112869894B CN 112869894 B CN112869894 B CN 112869894B CN 201911210400 A CN201911210400 A CN 201911210400A CN 112869894 B CN112869894 B CN 112869894B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/002—Orthodontic computer assisted systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H80/00—ICT specially adapted for facilitating communication between medical practitioners or patients, e.g. for collaborative diagnosis, therapy or health monitoring
Abstract
The application provides a design method, a preparation system and a preparation method of a shell-shaped dental appliance, wherein the design method comprises the following steps: acquiring initial dentition model information of a patient; comparing the initial dentition model information with dentition information of a reference model to obtain dentition characteristic information of a patient; generating a digital dental correction scheme of the current patient according to the dentition characteristic information; according to the digitized tooth correction scheme, a shell-shaped tooth correction device digital model is generated. The application provides a design method, a preparation system and a preparation method of a shell-shaped dental appliance, wherein manual intervention is not needed in the design and the preparation process of the shell-shaped dental appliance, and intelligent design and manufacture are realized.
Description
Technical Field
The application relates to the technical field of tooth correction, in particular to a design method, a preparation system and a preparation method of a shell-shaped tooth correction device.
Background
The misjaw deformity can bring great harm to the local part of the mouth cavity and even the whole body: affecting maxillofacial development, affecting oral health, affecting oral function, affecting appearance, etc. Currently patients are being treated by surgery or by wearing appliances. With the development of technology and the improvement of aesthetic quality, based on the development of computer technology and materials, the treatment of malocclusions by using invisible orthodontic methods is accepted by more and more patients, and the dislocation teeth can be corrected by wearing a series of shell-shaped dental appliances and continuously moving the teeth in a small range.
The design of the existing shell-shaped dental appliance is generally that a technician or doctor designs an appliance scheme with the assistance of a corresponding program, and then the design of the shell-shaped dental appliance is carried out according to the appliance scheme. The existing design method has high manual participation, high dependence on design experience and medical experience, and longer design process period, and can not meet the personalized and efficient requirements of the invisible correction patients. Furthermore, in the existing procedure, the intraoral data of the patient needs to be manually identified and labeled, and the manual labeling of teeth has the defects of low efficiency, low speed and the like, and once the teeth are labeled by mistake, the subsequent design is seriously influenced.
Disclosure of Invention
The application provides a design method, a preparation system and a preparation method of a shell-shaped dental appliance, wherein manual intervention is not needed in the design and the preparation process of the shell-shaped dental appliance, and intelligent design and manufacture are realized.
The technical scheme provided by the application is as follows:
a method of designing a shell-shaped dental appliance, comprising:
acquiring initial dentition model information of a patient, wherein the initial dentition model information at least comprises tooth information, dental arch information and occlusion information;
Comparing the initial dentition model information with dentition information of a reference model to obtain dentition characteristic information of a patient, wherein the dentition characteristic information at least comprises single tooth characteristic parameter information and dental arch characteristic parameter information;
generating a digital dental correction scheme of the current patient according to the dentition characteristic information;
according to the digital dental appliance scheme, a shell-shaped dental appliance digital model is generated.
Further preferably, the reference model comprises at least one of a standard model, a big data fitting model, and a classification model.
Further preferably, the acquiring initial dentition model information of the patient includes:
acquiring intraoral data of a patient;
acquiring an initial dentition model of a patient based on the intraoral data, identifying a dentition arrangement of the initial dentition model, and determining tooth marks of individual teeth in the initial dentition model through the dentition arrangement;
based on the tooth position arrangement and the tooth marks, acquiring relative position parameters of the dental arch, and measuring and establishing parameters of the dental arch;
further preferably, the identifying the dentition arrangement of the initial dentition model includes the steps of:
establishing a first priori model; the method comprises the steps of collecting the distance between every two adjacent teeth in the existing dentition model in a database and the number of missing teeth corresponding to the distance, and calculating probability distribution function values for the distances between different numbers of missing teeth;
Acquiring the distance between two adjacent teeth in the initial dentition model;
the dentition of the initial dentition model is determined based on the hidden Markov model.
Further preferably, the step of identifying the dentition arrangement of the initial dentition model specifically includes the steps of:
constructing a tooth state sequence vector of an existing dentition model, wherein the tooth state sequence vector is represented by K, and K= [ K ] 1 ，k 2 ，k 3 ，...，k 2n-1 ]Wherein n is the number of teeth contained in the existing dentition model, the vector K contains 2n-1 elements, the value of the odd element is the tooth label, and the value of the even element is the number of missing teeth between two adjacent teeth;
constructing a tooth observation sequence vector of the initial dentition model, wherein the tooth observation sequence vector is represented by B, and B= [ X ] 1 ，b 1 ，X 2 ，b 2 ，X 3 ，b 3 ，...，b n-1 ，X n ]Wherein X is i Representing the ith tooth, expressed by a constant, i is an integer from 1 to n, b j Representing a distance value between two adjacent teeth, wherein j is an integer from 1 to n-1, and n is the number of teeth contained in the initial dentition model;
calculating the probability value of each value of the tooth state sequence and the occurrence of the tooth observation sequence simultaneously; and taking the tooth position arrangement condition represented by the value of the tooth state sequence corresponding to the calculated maximum probability value as the tooth position arrangement of the initial tooth sequence model.
Further preferably, the initial dentition model information is compared with single tooth information of corresponding labels in reference model dentition information to obtain single tooth characteristic parameter information of a patient;
the single tooth characteristic parameter information at least comprises: and obtaining a distance deviation value of the single tooth along the direction of the dental arch line, a distance deviation value of the single tooth along the direction of the dental arch line vertical line in the dental arch plane and an angle deviation value of the dental axis of each tooth and the dental axis of the reference model along the normal direction of the dental arch plane according to the tooth marks.
Further preferably, the dental arch characteristic parameter information representing the dental arch of the patient is obtained by comparing the dental arch information in the initial dental arch model information with the dental arch information in the reference model;
the dental arch characteristic parameter information comprises dental arch labels, and at least one of dental arch length, dental arch width and dental arch curvature in the initial dental arch model information and a dental arch length, a dental arch width and a dental arch curvature corresponding to a reference model, and a dental arch width and a dental arch curvature deviation value in the initial dental arch model information.
Further preferably, according to the dentition characteristic information, a digital dental correction scheme of the current patient is generated, which specifically includes:
Acquiring characteristic parameter information of dental arches of patients; calculating dental arch characteristic parameter information of the patient, selecting an orthodontic treatment process of a candidate dental arch matched with the calculation result in a database when the calculation result is not more than a first preset threshold, and designing a digital orthodontic treatment scheme of teeth to be corrected according to the orthodontic treatment process of the candidate dental arch;
when the calculated result is larger than a first preset threshold value, obtaining characteristic parameter information of a single tooth of a patient, calculating the characteristic parameter information of the single tooth and screening out correction target teeth; calculating and screening the correction process of the candidate dental arch in a database according to the characteristic parameter information of the correction target teeth, and designing a digital correction scheme of the teeth to be corrected according to the correction process of the candidate dental arch.
Further preferably, according to the dentition characteristic information, a digital dental correction scheme of the current patient is generated, which specifically includes:
acquiring characteristic parameter information of a single tooth of a patient; calculating the characteristic parameter information of the single tooth, and comparing the calculation result with a second preset threshold value to screen out at least one correction target tooth; selecting at least one candidate tooth data set matched with the target tooth after tooth correction from a database; acquiring dental arch characteristic parameter information of a patient, and combining the candidate tooth dataset and the dental arch characteristic parameter information of the patient to acquire parameter information of the dental arch of the patient after the patient is about to correct; and taking the correction target teeth as an initial state and taking the dental arches after the correction as target states, correcting and arranging the correction target teeth, and designing a digital correction scheme of the teeth to be corrected.
Further preferably, the method further comprises digital correction scheme verification of the teeth to be corrected, and specifically comprises the following steps:
calculating the stress magnitude and/or moment magnitude and direction of the target teeth by adopting a finite element algorithm for each step of correcting the target teeth movement in the digital correction scheme, and judging whether the stress magnitude and/or moment magnitude and direction are in a preset range or not; if yes, outputting a digital correction scheme of the teeth to be corrected, wherein the digital correction scheme comprises step-by-step information; if not, changing the first preset threshold value or the second preset threshold value, and screening the candidate dental arch or the candidate teeth in the database again for design.
Further preferably, before generating the digital dental correction scheme of the current patient according to the dentition characteristic information, the method further comprises an occlusion relationship classification step, specifically comprising:
acquiring occlusion information in the initial dentition model information;
comparing the occlusion information with the occlusion information of a reference model to obtain occlusion classification information of initial dentition;
and screening a database of corresponding occlusion types according to the occlusion classification information.
Further preferably, before the shell-shaped dental appliance digital model is generated according to the digital dental appliance scheme, the method further comprises the step of acquiring confirmation information of doctors and patients on the digital dental appliance scheme.
Further preferably, the obtaining the confirmation information of the doctor and the patient on the digital dental correction scheme specifically includes:
acquiring personal information of a patient, and generating patient file information containing information of teeth to be corrected of the patient;
retrieving doctor information and matching the doctor information with the to-be-patient file information;
pushing the matched doctor information to the patient, and obtaining the confirmation information of the doctor and the patient on the digital correction scheme.
The invention also provides a system for preparing a shell-shaped dental appliance, comprising: an information acquisition module, a shell-shaped tooth appliance design module and a preparation module,
the information acquisition module is used for acquiring initial dentition model information of a patient;
the shell-shaped tooth appliance design module adopts the design method of any shell-shaped tooth appliance to design and generate a shell-shaped tooth appliance digital model;
a preparation module configured to prepare a shell dental appliance based on the shell dental appliance digital model.
The invention also provides a preparation method of the shell-shaped dental appliance, which comprises the following steps:
acquiring initial dentition model information of a patient, wherein the initial dentition model information at least comprises tooth information, dental arch information and occlusion information;
Comparing the initial dentition model information with dentition information of a reference model to obtain dentition characteristic information of a patient, wherein the dentition characteristic information at least comprises single tooth characteristic parameter information and dental arch characteristic parameter information;
generating a digital dental correction scheme of the current patient according to the dentition characteristic information;
generating a shell-shaped dental appliance digital model according to the digital dental appliance scheme;
and preparing the shell-shaped dental appliance according to the shell-shaped dental appliance digital model.
The design method, the preparation system and the preparation method of the shell-shaped dental appliance provided by the invention have the following beneficial effects:
comparing the initial dentition model information with dentition information of a reference model, obtaining dentition characteristic information of a patient, and designing a digital dental correction scheme, thereby obtaining a shell-shaped dental appliance digital model; in the process of completing the establishment of the shell-shaped tooth appliance digital model, manual intervention is not needed, intelligent design is realized, and the visual experience of a patient is improved from the perspective of the patient; the on-line acquisition of the diagnosis and treatment parameters of the patient is performed on the doctor side, so that the design time is saved, the relevant data of the patient and the doctor can be mastered more systematically and comprehensively on the delivery side, and the design of the appliance is more accurate.
Drawings
The above features, technical features, advantages and implementation manners of the shell-shaped dental appliance will be further described in a clear and easily understood manner by referring to the following description of the preferred embodiments with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method of designing a shell-shaped dental appliance in accordance with the present invention;
FIG. 2 is a flow chart of a method for determining the tooth position arrangement of a tooth model to be tested according to the present invention;
FIG. 3 is a schematic view of the tooth arrangement of the tooth model of the present invention;
FIG. 4 is a schematic view of a tooth arrangement of a further tooth model according to the present invention;
FIG. 5 is a schematic view of a tooth arrangement of a further tooth model according to the present invention;
FIG. 6 is a schematic view of a tooth arrangement of a further tooth model according to the present invention;
FIG. 7 is a flowchart of the digitized tooth correction scheme generation of the present invention;
FIG. 8 is a flowchart of yet another digital dental appliance generation scheme of the present invention;
FIG. 9 is a flowchart of a digital dental appliance verification scheme of the present invention;
FIG. 10 is a flow chart of physician and patient interactions in the digital dental appliance design of the present invention;
FIG. 11 is a schematic block diagram of a shell dental appliance preparation system of the present invention;
Fig. 12 is a flow chart of a method of making a shell dental appliance of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
The invention provides a design method, a preparation system and a preparation method of a shell-shaped dental appliance, which are used for realizing the automatic design and production of the shell-shaped dental appliance.
First, the present embodiment provides a design method of a shell-shaped dental appliance, and a flowchart thereof is shown in fig. 1, and specifically includes the following steps.
S110: initial dentition model information of a patient is acquired.
Specifically, the intraoral data of the patient is acquired based on the intraoral scanner, and then the initial dentition model information of the patient is acquired based on the intraoral data.
Since the intraoral data acquired by the intraoral scanner is intraoral image information, the intraoral image information needs to be analyzed to obtain initial dentition model information of the patient, which includes at least dental information, dental arch information, and occlusion information.
The specific analysis processing comprises the following steps:
acquiring an initial dentition model of a patient based on intraoral data, identifying the dentition arrangement of the initial dentition model, and determining the tooth marks of each single tooth in the initial dentition model through the dentition arrangement;
based on the tooth position arrangement and the tooth marks, acquiring relative position parameters of the dental arch, and measuring and establishing parameters of the dental arch;
and acquiring occlusal parameters of the maxillofacial region.
The method specifically includes the steps of identifying the tooth position arrangement of the initial dentition model, and the flowchart is shown in fig. 2:
s1111: establishing a first priori model; the method comprises the steps of collecting the distance between every two adjacent teeth in the existing dentition model in a database and the number of missing teeth corresponding to the distance, and calculating probability distribution function values for the distances between different numbers of missing teeth;
s1112: acquiring the distance between two adjacent teeth in the initial dentition model;
s1113: the dentition of the initial dentition model is determined based on the hidden Markov model.
In S1111, constructing a tooth state sequence vector of an existing dentition model, where the tooth state sequence vector is denoted by K; the tooth state sequence is vector K, K= [ K ] 1 ，k 2 ，k 3 ，...，k 2n-1 ]N is the number of teeth contained in the existing tooth model; the vector K contains 2n-1 elements, the value of the odd element is the tooth number, and the value of the even element is the number of missing teeth between two adjacent teeth. The tooth state sequence K has 16-! /(n-! X (16-n) ≡! ]Seed value, wherein-! Representing a factorial operation, n being an integer from 0 to 16; each value of the tooth state sequence K corresponds to a tooth position arrangement of the tooth model.
As an example, the teeth are numbered: assuming that there is no missing tooth, the upper right wisdom teeth are numbered 1 to 16 in sequence in the upper left wisdom tooth direction, and the lower right wisdom teeth are numbered 17 to 32 in sequence in the lower left wisdom tooth direction. According to this tooth numbering, fig. 3 to 6 show different tooth arrangements of the upper row tooth model. Circles in the figure represent the actual teeth that remain, and the numbers in the circles are the tooth numbers. The square boxes in the figure represent the gaps between two adjacent retained teeth, and the numbers in the boxes represent the number of missing teeth between two adjacent retained teeth.
In S1112, a tooth observation sequence vector of the initial dentition model is constructed, the tooth observation sequence being vector B, b= [ X 1 ，b 1 ，X 2 ，b 2 ，X 3 ，b 3 ，...，b n-1 ，X n ]The method comprises the steps of carrying out a first treatment on the surface of the Wherein X is i Representing the ith tooth, wherein the ith tooth is represented by a constant, and i is an integer from 1 to n; b j Representing a spacing value between two adjacent teeth, j being an integer from 1 to n-1; n is the number of teeth the tooth model to be tested contains.
In S1111, a plurality of other prior models may be added to improve the accuracy of the calculation. If the second prior model is further added, the feature quantity of the characterization position of each tooth in the existing tooth model can be acquired, and the probability distribution function value is calculated for the feature quantity of at least the characterization position of the tooth with the same number. Optionally, the second prior model further includes collecting any one or more of characteristic quantities of the characteristic area, the volume and the shape size of each tooth in the existing tooth model, and calculating probability distribution function values for the characteristic quantities of the characteristic area, the characteristic quantity of the characteristic volume and the characteristic quantity of the shape size of the tooth with the same number respectively. Then at this time X i Representing the characteristic quantity of the ith tooth.
S1113 determines the dentition of the initial dentition model based on the hidden markov model.
The determining the tooth position of the tooth column model to be initialized based on the hidden Markov model means that: and calculating a probability value of each value of the tooth state sequence and the tooth observation sequence which occur simultaneously based on the established one or more prior models, and taking the tooth position arrangement condition represented by the value of the tooth state sequence corresponding to the calculated maximum probability value as the tooth position of the initial tooth column model.
Specifically, the probability P (B|K) of generating the tooth observation sequence B under each value of the tooth state sequence K and the state transition probability P (K) of forming the tooth state sequence K are calculated, and then the probability P (B|K) P (K) of simultaneously occurring each value of the tooth observation sequence B and the tooth state sequence K is calculated; and taking the tooth position arrangement condition represented by the value of the tooth state sequence K corresponding to the maximum probability value P (B, K) as the tooth position of the initial tooth column model.
For example, P (b|k) is calculated using the following formula;
wherein pi represents a multiplication number, P (X i |k 2i-1 ) Denoted by the number k 2i-1 The tooth appearance characteristic quantity X of (2) i Probability of (2); p (b) j |k 2j ) Representing the number of missing teeth as k 2j When the distance value between two adjacent teeth is b j Probability of P (X) i |k 2i-1 ) A uniform distribution may be employed.
For example, P (K) is calculated using the following formula;
wherein pi represents a multiplication number, P (k) 2i+1 |k 2i-1 ) Representative tooth number k 2i-1 The tooth number k appears behind the tooth of (2) 2i+1 Probability of arrangement of teeth, P (k) 2i+1 |k 2i-1 ) A uniform distribution may be employed.
For example, P (B, K) is calculated using the following formula;
where max represents the maximum value and Q represents the set of all values of the vector K.
The accurate calculation of tooth position arrangement and the determination of the label are the basis for realizing the comparison of corresponding teeth in a single tooth and a reference model, the reliable and correct guarantee of the characteristic parameter information of the following teeth, and the basis for simultaneously calculating dental arch parameters and dental arch characteristic parameters and acquiring occlusion parameters based on tooth position arrangement and the label of the teeth.
S120: and comparing the initial dentition model information with the dentition information of the reference model to obtain the dentition characteristic information of the patient.
Wherein the reference model comprises at least one of a standard model, a big data fitting model and a classification model.
The standard model can be an Angle ideal normal dental model, namely a model which stores all pairs of teeth, the teeth are orderly arranged on the upper dental arch and the lower dental arch, the upper dental cusp relationship is completely correct, and the dental jaw relationship of the upper dental arch and the lower dental arch is quite ideal. The initial dentition of the patient may be compared and calculated using the ideal normal dentition as a reference standard.
In the general orthodontic process, a big data fitting model can be used as a reference standard, the big data fitting model is based on huge data statistics, and then individual normal dentognathic of modern people is used for fitting a data source, and the fitting model can be continuously iterated and updated in the data process, so that the method has a practical reference meaning.
The classification model can be established by taking age and gender standards as the basis of classification. For example, in the age of 7-13 years, because the stage is in the replacement period of children/teenagers, an ideal normal dental model is slightly deficient and cannot truly reflect the specific conditions of deciduous teeth and permanent teeth, so that big data fitting and calculation can be performed by adopting the states of teeth and dental teeth of the children/teenagers in the age stage, and a reference standard suitable for patients in the age stage is established; further, the states of teeth and dentognathic states in the age of 13-19 years can be counted for fitting and calculation, and a reference standard suitable for patients in the age is established; and so on, building adult models, and the like. Furthermore, the method can be divided according to gender, or after the teeth and the jaw statistics are carried out by combining age and gender, fitting and calculation are carried out, and a reference standard suitable for the crowd is established.
In particular embodiments, the appropriate reference model may be selected based on age information, gender information, etc. in the patient's personal information, so that the reference standard is more targeted, and thus more appropriate for use in subsequent appliance designs.
The corresponding database in the invention can also be set according to the classification of the reference model, and the candidate data is selectively screened in the corresponding database in the generation of the digital appliance proposal, so that the design of the appliance proposal is more scientific.
Wherein, the dentition characteristic information at least comprises single tooth characteristic parameter information and dental arch characteristic parameter information.
Comparing the initial dentition model information with dentition information of a reference model, and particularly comparing the initial dentition model information with single tooth information at a corresponding position in the dentition information of the reference model to obtain single tooth characteristic parameter information of a patient; the single tooth characteristic parameter information at least comprises: and obtaining a distance deviation value of a single tooth along the direction of the dental arch line, a distance deviation value of the single tooth along the direction of the dental arch line vertical line in the dental arch plane and an angle deviation value of the dental axis of each tooth and the dental axis of the reference model along the normal direction of the dental arch plane according to the tooth marks.
In this embodiment, a distance deviation value of a single tooth along a direction of an arch line is denoted by c, a distance deviation value of the single tooth along a direction of a perpendicular to the arch line in a plane of the arch is denoted by d, and an angle deviation value of a tooth axis of the single tooth and a tooth axis of a reference model along a normal direction of the plane of the arch is denoted by e. Taking the maxillary permanent tooth as an example, the comparison with the standard model can be performed in a differential mode, the positive and negative of the differential value can further represent the deviation direction of the maxillary permanent tooth with the reference model in the mesial-distal direction, the lingual side direction or the rotation direction of the dental axis, and the deviation direction can be recorded schematically as follows:
table 1:
| tooth labels | 1 | 2 | 3 | …… | 15 | 16 |
| c/mm | 0 | 5 | 6 | …… | -9 | - |
| d/mm | 0 | -8 | 4 | …… | 5.2 | - |
| e/° | 0 | 20 | -7 | …… | 15 | - |
The tooth 1 is the third molar on the right upper part, the deviation is 0, and the comparison of the tooth with the tooth 1 of the reference model is basically no deviation; as shown in the above table, if No. 16 has no data, it indicates that the upper left third molar is missing, where there is no wisdom tooth; referring to the data of tooth number 2, which deviates 5mm farther in the arch line direction in the arch plane than the reference model, deviates 8mm lingually in the arch line perpendicular direction in the arch plane, and deviates 20 ° clockwise in the arch plane normal direction, each tooth can be identified with its index and three comparison index deviation values; similarly, the corresponding comparison analysis is carried out on each tooth, and the comparison data of the whole mouth single tooth can be obtained.
Comparing the initial dentition model information with the dentition information of the reference model, specifically, comparing the initial dentition model information with the dental arch information in the reference model to obtain dental arch characteristic parameter information representing dental arch of a patient; the dental arch characteristic parameter information comprises dental arch labels, and at least one of dental arch length, dental arch width, dental arch curvature in the initial dental arch model information and a dental arch length, a dental arch width, a dental arch curvature corresponding to a reference model, a dental arch width and a dental arch curvature deviation value in the initial dental arch model information.
Based on the obtained intraoral data, the overall dentition condition is identified, the dentition arrangement and the tooth labels are resolved, and initial arch information is further calculated. The calculation and the acquisition of the basic comparison information can have various characteristic values, and in the embodiment, the following steps are adopted: the dental arch length is recorded from the third molar (namely the tooth 1, the tooth 2 if the tooth 1 is missing) to the incisor (the tooth 8) in the first quadrant as the length in the first quadrant, the length in the second quadrant is calculated in the same way, the sum of the two lengths is the length of the dental arch of the upper jaw, and the length of the dental arch of the lower jaw is calculated in the same way; arch width, which can record a plurality of width values, in this embodiment with the second molar (tooth No. 2) in the first quadrant and the first tooth in the second quadrant Calculating the distance value between two teeth (15 th teeth), and adding the distance value between corresponding cuspids or other teeth for the accuracy of data; further, the curvature of the dental arch and the curvature r of the dental arch curve at the corresponding tooth center point on the curve are respectively calculated and identified xx (xx is the tooth mark) and selecting the point with the largest curvature change as the characteristic point r of the dentition curvature xx . Further, the present embodiment uses the curvature change of the cuspids as a reference for feature comparison.
The arch length in the initial dentition model information includes a maxillary arch length and a mandibular arch length, and a dental arch width a maxillary arch width and a mandibular arch width, wherein, in order to facilitate the subsequent description of the dental arch characteristic parameter information, in this embodiment, the maxillary arch length in the initial dentition model information is represented by S, the mandibular arch length is represented by T, the maxillary arch width is represented by U, the mandibular arch width is represented by V, and the dental arch rate is represented by W. Further, when the deviation degree value of the dental arch length, width and curvature corresponding to the reference model is obtained by comparing, the dental arch characteristic parameter information can be expressed by the deviation degree, namely, the maxillary dental arch length deviation value is expressed by s, the mandibular dental arch length deviation value is expressed by t, the maxillary dental arch width deviation value is expressed by u, the mandibular dental arch width deviation value is expressed by v, and the dental arch rate deviation value is expressed by w. That is, the arch characteristic parameters may be characterized using (s, t, u, v, w), as illustrated in table 2 below.
Table 2:
| characteristic parameters of dental arch | Dentition 1 | Dentition 2 | Dentition 3 | …… |
| Upper jaw arch length deviation value s | 1 | 1.2 | 0.95 | …… |
| Mandibular arch length deviation value t | 1 | 1.18 | 0.89 | …… |
| Upper jaw arch width deviation value u | 1 | 1.06 | 1.05 | …… |
| Mandibular arch width deviation value v | 1 | 1.05 | 1.0 | …… |
| Curvature characteristic point w | 1 | 1.04 | 1.05 | …… |
In the above table, the ratio of the corresponding parameters of the dental arch of the patient to the corresponding parameters of the reference dental arch is used to characterize the salt worker feature parameters. The closer the deviation value is to 1, the closer the dental arch is to the reference model, the greater the ratio is to 1, the greater the length or width is than the reference model, and the smaller the ratio is to 1, the smaller it is.
The deviation values of various distances between the single tooth in the single tooth characteristic parameter information and the single tooth of the reference model, the deviation values of the length, the width and the like in the dental arch characteristic parameter information and the corresponding parameters in the reference model can be in the form of a ratio value or a difference value, and can also be in the form of other calculated comparison values. Through calculation, each tooth and the dental arch information of each tooth can be provided with a group of numerical information on a mathematical model, and the numerical information can be further fed back to a large database for comparison.
In this embodiment, by comparing the tooth characteristic parameter information and the dental arch characteristic parameter information with the reference model, the dental row characteristic information including the tooth characteristic parameter information and the dental arch characteristic parameter information can be used for representing and/or representing the dental row condition, the pose condition and the like of a patient in the database system. After the class standardization processing is carried out, the data can be stored, called and compared more conveniently.
In order to simplify data calculation and accurately match the reference model, the method can further comprise a bite relationship classification step, which specifically comprises the following steps:
acquiring occlusion information in initial dentition model information;
comparing the occlusion information with the occlusion information of the reference model to obtain occlusion classification information of the initial dentition; specifically, the occlusion relationship of the initial dentition can be roughly divided into an Anshi class, an Anshi class and an Anshi class, and further fine classification can be performed on the basis of an Anshi classification.
Screening a database of occlusion types corresponding to the initial dentition occlusion relationship according to the occlusion classification information, and searching and comparing matched dentitions in the database, wherein the searching and comparing effects after correction are equal. Thereby greatly reducing the calculated amount in the design scheme calculation process.
The database used in generating the current patient's digitized dental appliance may be the original large database or a database of the corresponding bite types selected via the screening described above.
S130: and generating a digital dental correction scheme of the current patient according to the dentition characteristic information.
The present embodiment provides the following ways to generate a digitized dental correction regimen for a current patient:
The digital tooth correction scheme is generated by the following process, and the flow chart is shown in fig. 7:
s1311: and obtaining characteristic parameter information of dental arches of the patient.
Specifically, the deviation values of the dental arch length, the dental arch width, the dental arch curvature corresponding to the reference model and the dental arch width and the dental arch curvature of the dental arch length, the dental arch width and the dental arch curvature of the dental arch are obtained from the initial dental column model information of the patient: s, t, u, v, w.
S1312: and calculating characteristic parameter information of the dental arch of the patient.
In this step, specifically, a weighted average of the deviation values acquired in step S1311 is calculated, and the degree of deviation and/or deformity of the dental arch is represented by the magnitude of the weighted average.
S1313: whether the calculation result is not greater than the first preset threshold is determined, if yes, step S1314 is performed, and if not, step S1315 is performed.
The calculation result of S1312 is the deviation degree of the dental arch, when the deviation degree is smaller than a specific value, the ideal dental arch can be referred to for tooth arrangement, if the deviation degree is larger than the specific value, the calculation is further needed for each tooth data of the patient, so in this scheme, the specific value is defined as a first preset threshold, further, when the calculation result is smaller than or equal to the first preset threshold, the correction process of the dental arch of the corrected patient, which approximates to the patient, is selected through step S1314, and if the calculation result is larger than the first preset threshold, the correction target tooth of the patient is needed to be selected through steps S1315-S1316.
S1314: and selecting an orthodontic treatment process of the candidate dental arch matched with the calculation result in the database, and designing a digital orthodontic treatment scheme of teeth to be corrected according to the orthodontic treatment process of the candidate dental arch.
S1315: and obtaining characteristic parameter information of a single tooth of the patient.
The method comprises the steps of obtaining a distance deviation value of a single tooth along the direction of an arch line, a distance deviation value along the direction of a perpendicular line of the arch line in an arch plane and an angle deviation value of a tooth axis of each tooth and a tooth axis of a reference model along the direction of the normal line of the arch plane in initial dentition model information of a patient: c. d, e.
S1316: calculating the characteristic parameter information of the single tooth and screening out the correction target tooth.
For example, the deviation values of the individual teeth are sorted, and the individual teeth are screened out according to the deviation degree, for example, 3 to 5 teeth are screened out as the target teeth.
S1317: calculating and screening the correction process of the candidate dental arch in the database according to the characteristic parameter information of the correction target teeth, and designing a digital correction scheme of the teeth to be corrected according to the correction process of the candidate dental arch.
Similarly, the deviation values of the correction target teeth can be weighted and averaged to be sequentially arranged in a database to screen the correction process of the candidate dental arch.
The process of generating the digital dental correction scheme is as follows, and the flow chart is shown in fig. 8:
s1321: and obtaining characteristic parameter information of a single tooth of the patient.
Specifically, a distance deviation value of a single tooth along the direction of an arch line, a distance deviation value of the single tooth along the direction of a perpendicular line of the arch line in an arch plane and an angle deviation value of the tooth axis of each tooth and the tooth axis of a reference model along the direction of the normal line of the arch plane in the initial dentition model information of a patient are obtained: c. d, e.
S1322: and calculating characteristic parameter information of each single tooth.
Specifically, the deviation values c, d, e obtained in step S1321 are weighted and averaged.
S1323: and judging whether the calculation result is greater than or equal to a second preset threshold value, if so, executing the step S1324, and if not, ending.
The calculation result of S1322 is a deviation value of each individual tooth, and accordingly, when the deviation value of the individual tooth is greater than a specific value, it is indicated that the individual tooth needs to be corrected, so in this scheme, by defining the specific value as a second preset threshold value, comparing the calculation result with the second preset threshold value, it is determined whether each tooth of the patient needs to be corrected, that is, when the calculation result of the tooth is greater than or equal to the second preset threshold value, it is indicated that the individual tooth needs to be corrected, and when the calculation result of the tooth is less than the second preset threshold value, it is indicated that the individual tooth does not need to be corrected, that is, the individual tooth of the patient does not need to be corrected, and when it is determined that the individual tooth of the patient does not need to be corrected through S1323, the correction process is ended.
S1324: the single tooth is determined to be the target tooth, and generally, after the judgment of S1323, at least one target tooth is determined.
S1325: at least one post-dental-appliance candidate tooth dataset matching the appliance target tooth is selected in the database.
For example, a set value range of the deviation value from the target tooth is selected as the set of the candidate teeth after the correction, wherein the set value range of c is [ -10, 10], the set value range of d is [ -5,5], the set value range of e is [ -15, 15], and the set of the candidate teeth after the correction, which is matched with the target tooth, is selected.
S1326: and obtaining characteristic parameter information of dental arches of the patient.
Specifically, the deviation values of the upper jaw dental arch length, the lower jaw dental arch length, the upper jaw dental arch width, the lower jaw dental arch width and the dental arch curvature in the initial dental column model information of the patient are obtained: s, t, u, v, w.
S1327: and combining the candidate tooth data set and the characteristic parameter information of the dental arch of the patient to obtain the parameter information of the dental arch of the patient after the dental arch is to be corrected.
S1328: taking the teeth to be corrected as an initial state and the dental arches to be corrected as a target state, correcting and arranging the teeth to be corrected, and designing a digital correction scheme of the teeth to be corrected.
In the above two ways of generating the digital correction scheme, it should be noted that the weighted average value, the maximum deviation value, and the like in the calculation are all screening conditions, and may be interchanged to derive various embodiments, which are not specifically limited herein.
Because the first preset threshold and the second preset threshold are different according to the calculation mode or given parameters, the first preset threshold and the second preset threshold can change greatly, and the selection of the first preset threshold and the second preset threshold directly affects the result of the digital correction scheme designed in the two schemes, further, in order to verify the generated digital correction scheme, the embodiment further comprises the step of verifying the digital correction scheme of the teeth to be corrected:
calculating the stress magnitude and/or moment magnitude and direction of the target teeth by adopting a finite element algorithm for each step of correcting the target tooth movement in the digital correction scheme, and judging whether the stress magnitude and/or moment magnitude and direction are in a preset range or not; if yes, outputting a digital correction scheme of the teeth to be corrected, wherein the digital correction scheme comprises step-by-step information; if not, correcting the first preset threshold or the second preset threshold, and screening the similar dental arches or the similar teeth in the database again for design.
The force applied to each tooth may be preset to be less than or equal to 60g, and the moment=force is represented by a distance, where the force is represented by a multiplication, the distance from the acting point to the impedance center is determined, and then the range of the moment is determined, that is, the moment < =60×distance, and then the force applied to the tooth to be corrected is analyzed by finite elements to verify whether the digital tooth correction scheme is optimal, where the flowchart is shown in fig. 9, and specifically includes the following steps:
s1331: simulating the moving process from the initial state to the target state of each step of each correction target tooth in the digital tooth correction scheme;
s1332: determining the stress corresponding to the movement amount of each correction target tooth by using a finite element analysis method;
s1333: judging whether the stress of each correction target tooth is less than or equal to 60g, if not, executing the step S1334, and if so, executing the step S1335;
s1334: correcting the first preset threshold value or the second preset threshold value, and screening similar dental arches or similar teeth in the database again to design;
s1335: outputting a digital correction scheme of the teeth to be corrected, wherein the digital correction scheme comprises distribution information.
Through the verification, the optimal digital dental correction scheme can be obtained.
S140: according to the digitized tooth correction scheme, a shell-shaped tooth correction device digital model is generated.
In order to obtain the optimal shell-shaped dental appliance digital model, before the shell-shaped dental appliance digital model is generated, the method further comprises the step of obtaining confirmation information of doctors and patients on the digital dental appliance scheme, and specifically comprises the following steps of the flowchart shown in fig. 10:
s141: and obtaining personal information of the patient, and generating patient file information containing the information of the teeth requirement of the patient to be corrected.
The patient profile information includes personal information of the patient and may also include specific information required by the patient for dental correction. The personal information at least comprises the name, age, sex, contact information and the like of the patient; and may further include medical preference information such as distance information, medical preference information, etc. The file also comprises the teeth requirement information to be corrected of the patient, and at least comprises the following components: patient opening, frontal, side, smiling, patient intraoral data scan information, etc., for example, the patient may take a desired photograph via a smartphone and enter personal information via a personal information portal, which may be obtained via an intraoral scanner or via CBCT (3D oral imaging system).
The patient's personal information may also be used to select a reference model, database, etc. that matches the personal information at the time of design. For example, a reference model of a certain age group may be used to calculate dentition characteristic information at a certain age group.
S142: and retrieving doctor information, matching the doctor information with the file information of the patient to be tested, and pushing the matched doctor information to the patient.
The doctor information comprises doctor personal information, seniority information, evaluation information and the like, the doctor personal information comprises regions, languages, sexes and the like, the doctor seniority information comprises service life, qualification license, correction type and the like, and the doctor evaluation information comprises evaluation of corrected users, industry evaluation, clinic evaluation and the like.
The matching calculation and pushing are performed by combining the requirement information and doctor information of the patient in the patient file information, for example, the patient can be automatically pushed, and the pushing can be screened according to conditions.
The automatic pushing process comprises the following steps: classifying according to certain demand characteristics (such as orthodontic tooth type) according to the demand information of the patient, calling doctor information, calculating according to the demand characteristics, and pushing the front N doctors of the relevance to the patient.
The process of screening and pushing according to the conditions is as follows: and inputting a requirement condition, searching matched doctors according to the condition, and pushing the front N doctors of the relevance to the patient.
S143: and acquiring the confirmation information of doctors and patients on the digital correction scheme.
After the matched doctor is pushed to the patient in step S142, the patient and doctor can communicate through the interactive interface, and the patient can further propose refined design requirements, for example, whether to accept tooth extraction, whether to accept adjacent surface stripping, whether to accept combined anchorage implantation, or some time requirements, for example, planning a correction period, or consultation of other medical problems.
The doctor designs the correction scheme according to the requirement of refinement, and presents the scheme to the patient through a corresponding platform for the patient to confirm or select. In the design stage, the model can be subjective design of doctors, automatic design, modification of doctors after automatic design, and the platform provides animation demonstration of the whole treatment scheme for patients in a dynamic demonstration mode.
After patient confirmation, the patient is presented with a final protocol that may include other information, such as, for example, the cost of the appliance, in addition to the protocol itself (the method, process, cycle, etc.).
Based on the automated design method of the shell-shaped dental appliance provided by the implementation, the communication between doctors and patients can be in a remote mode, so that the patients can obtain the scheme of dental appliance without going home or nearby, and the doctor and the patient confirm the scheme of the appliance immediately.
The design method of the shell-shaped dental appliance provided by the embodiment has at least the following effects:
1) Comparing the initial dentition model information with dentition information of a reference model, obtaining dentition characteristic information of a patient, and designing a digital dental correction scheme, thereby obtaining a shell-shaped dental appliance digital model; in the process of completing the establishment of the shell-shaped tooth appliance digital model, manual intervention is not needed, intelligent design is realized, and the visual experience of a patient is improved from the perspective of the patient; the on-line acquisition of the diagnosis and treatment parameters of the patient is performed on the doctor side, so that the design time is saved, the relevant data of the patient and the doctor can be mastered more systematically and comprehensively on the delivery side, and the design of the appliance is more accurate.
2) Comparing the initial dentition model information with single tooth information of corresponding labels in reference model dentition information to obtain single tooth characteristic parameter information of a patient and dental arch characteristic parameter information representing dental arch of the patient; the initial dentition is standardized, the dentition real object and/or image information of the patient is converted into digital information, and the multi-dimensional parameter number is used for representing the patient information. Based on statistics and analysis of big data, the shell-shaped dental appliance digital model is more efficient and accords with humanized design, and the manufactured shell-shaped dental appliance enables a patient to have optimal wearing comfort.
3) In the initial dentition analysis, a hidden Markov model is used to determine the tooth positions of the initial dentition model, and each tooth is labeled based on the tooth positions. Compared with the manual numbering in the prior art, the automatic labeling machine realizes automatic labeling, has high efficiency and high speed, and provides a good foundation for automatic design. The accurate calculation of the tooth position arrangement and the determination of the marks provide a data basis for realizing the comparison of the corresponding teeth in the single tooth and the reference model, and the tooth characteristic parameter information is more reliable when further acquired.
4) And calculating the stress magnitude and/or moment magnitude and direction of the correction target teeth by adopting a finite element algorithm for the correction target tooth movement amount in the digital correction scheme, judging whether the stress magnitude and/or moment magnitude and direction are in a preset range, and if not, adjusting the digital correction scheme, so that the designed shell-shaped tooth correction device digital model is more in line with an individual patient.
5) Before the shell-shaped dental appliance digital model is generated, confirmation of a doctor and a patient on the digital dental appliance scheme is further acquired, and the patient can select a matched doctor in a remote mode and consult the doctor with an automatic dental appliance scheme and a design scheme of the shell-shaped dental appliance. After the doctor confirms and the patient accepts, the design scheme of the shell-shaped dental appliance is immediately obtained, the existing doctor-seeking mode is changed, the conventional doctor-seeking time is greatly shortened for the patient, and the working efficiency is greatly improved for the doctor. And the interaction and participation of both doctors and patients can improve the cognition and acceptance of patients on the designed shell-shaped tooth appliance.
The invention also provides a preparation system of the shell-shaped dental appliance, the functional block diagram of which is shown in fig. 11, comprising: an information acquisition module 1, a shell-shaped dental appliance design module 2 and a preparation module 3.
The information acquisition module 1 is configured to acquire initial dentition model information of a patient, and may be any form of electronic receiving device; still further, it may be configured to obtain intraoral data of the patient, and further obtain initial dentition model information according to the intraoral data, where the information acquisition module 1 may be an intraoral scanner, i.e. obtain intraoral data of the patient by intraoral scanning.
The shell-shaped dental appliance design module 2 is configured to obtain initial dentition model information of a patient through the information acquisition module 1, and design and generate a shell-shaped dental appliance digital model by adopting the design method of the shell-shaped dental appliance provided by the invention, and the detailed design process is omitted herein.
The preparation module 3 is configured to prepare a shell dental appliance based on the shell dental appliance digital model.
In some embodiments, the preparation module 3 may be a 3D printer, the preparation module 3 directly integrally printing into the shell dental appliance based on the shell dental appliance digital model.
In some embodiments, the preparation module 3 may also be a preparation method of hot-pressed film forming, for example, generating a corresponding dental model based on the digital model of the shell-shaped dental appliance, and then preparing the corresponding shell-shaped dental appliance based on the dental model using a conventional hot-pressed film preparation process.
In the invention, a design method of the shell-shaped dental appliance can be adopted to generate and generate a digital model of the shell-shaped dental appliance, so that the shell-shaped dental appliance can be directly and quickly generated and prepared.
The invention also provides a preparation method of the shell-shaped dental appliance, the flow chart of which is shown in fig. 12, and the preparation method specifically comprises the following steps.
S510: initial dentition model information of a patient is acquired.
The initial dentition model information includes at least tooth information, arch information, and bite information.
S520: and comparing the initial dentition model information with the dentition information of the reference model to obtain the dentition characteristic information of the patient.
The dentition characteristic information at least comprises single tooth characteristic parameter information and dental arch characteristic parameter information.
S530: and generating a digital dental correction scheme of the current patient according to the dentition characteristic information.
S540: according to the digitized tooth correction scheme, a shell-shaped tooth correction device digital model is generated.
S550: preparing a shell dental appliance from the shell dental appliance digital model.
The specific implementation process of the steps S510-S540 is referred to the steps S110-S140 of the present invention, and will not be described herein.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (13)
1. A method of designing a shell-shaped dental appliance, comprising the steps of:
acquiring initial dentition model information of a patient, wherein the initial dentition model information at least comprises tooth information, dental arch information and occlusion information;
comparing the initial dentition model information with dentition information of a reference model to obtain dentition characteristic information of a patient, wherein the dentition characteristic information at least comprises single tooth characteristic parameter information and dental arch characteristic parameter information; wherein the reference model comprises at least one of a standard model, a big data fitting model and a classification model;
generating a digital dental correction scheme of the current patient according to the dentition characteristic information;
Generating a shell-shaped dental appliance digital model according to the digital dental appliance scheme;
wherein the acquiring initial dentition model information of the patient comprises:
acquiring intraoral data of a patient;
acquiring the initial dentition model of a patient based on the intraoral data, identifying a dentition arrangement of the initial dentition model, and determining tooth labels of individual teeth in the initial dentition model through the dentition arrangement; and acquiring relative position parameters of the dental arch based on the dental position arrangement and the tooth marks, and measuring and establishing the parameters of the dental arch.
2. The method of designing a shell dental appliance of claim 1, wherein the identifying the dentition arrangement of the initial dentition model comprises the steps of:
establishing a first prior model, which comprises the steps of collecting the distance between every two adjacent teeth in the existing dentition model in a database and the number of missing teeth corresponding to the distance, and calculating probability distribution function values for the distances of the missing teeth of different numbers;
acquiring the distance between two adjacent teeth in an initial dentition model of the patient;
the dentition of the initial dentition model is determined based on the hidden Markov model.
3. The method of designing a shell dental appliance of claim 2, wherein the identifying the dental site of the initial dentition model specifically comprises the steps of:
Constructing a tooth state sequence vector of an existing dentition model, wherein the tooth state sequence vector is represented by K, and K= [ K ] 1 ,k 2 ,k 3 ,...,k 2n-1 ]Wherein n is the number of teeth contained in the existing dentition model, the vector K contains 2n-1 elements, the value of the odd element is the tooth label, and the value of the even element is the number of missing teeth between two adjacent teeth;
constructing a tooth observation sequence vector of the initial dentition model, wherein the tooth observation sequence vector is represented by B, and B= [ X ] 1 ,b 1 ,X 2 ,b 2 ,X 3 ,b 3 ,...,b n-1 ,X n ]Wherein X is i Representing the ith tooth, expressed by a constant, i is an integer from 1 to n, b j Representing a distance value between two adjacent teeth, wherein j is an integer from 1 to n-1, and n is the number of teeth contained in the initial dentition model;
calculating the probability value of each value of the tooth state sequence and the occurrence of the tooth observation sequence simultaneously; and taking the tooth position arrangement condition represented by the value of the tooth state sequence corresponding to the calculated maximum probability value as the tooth position arrangement of the initial tooth sequence model.
4. The method of designing a shell-like dental appliance of claim 1, wherein the initial dentition model information is compared with corresponding numbered individual tooth information in reference model dentition information to obtain individual tooth characteristic parameter information of the patient;
The single tooth characteristic parameter information at least comprises: and obtaining a distance deviation value of the single tooth along the direction of the dental arch line, a distance deviation value of the single tooth along the direction of the dental arch line vertical line in the dental arch plane and an angle deviation value of the dental axis of each tooth and the dental axis of the reference model along the normal direction of the dental arch plane according to the tooth marks.
5. The method of designing a shell-like dental appliance of claim 1, wherein arch characteristic parameter information representing a patient's arch is obtained by comparing arch information in the initial dentition model information with arch information in a reference model;
the dental arch characteristic parameter information comprises dental arch labels, and at least one of dental arch length, dental arch width and dental arch curvature in the initial dental arch model information and a dental arch length, a dental arch width and a dental arch curvature corresponding to a reference model, and a dental arch width and a dental arch curvature deviation value in the initial dental arch model information.
6. The method of designing a shell dental appliance of claim 1, wherein generating a digital dental appliance for a current patient based on the dentition characteristic information, comprises:
acquiring characteristic parameter information of dental arches of patients; calculating dental arch characteristic parameter information of the patient, selecting an orthodontic treatment process of a candidate dental arch matched with the calculation result in a database when the calculation result is not more than a first preset threshold, and designing a digital orthodontic treatment scheme of teeth to be corrected according to the orthodontic treatment process of the candidate dental arch;
When the calculated result is larger than a first preset threshold value, obtaining characteristic parameter information of a single tooth of a patient, calculating the characteristic parameter information of the single tooth and screening out correction target teeth; calculating and screening the correction process of the candidate dental arch in a database according to the characteristic parameter information of the correction target teeth, and designing a digital correction scheme of the teeth to be corrected according to the correction process of the candidate dental arch.
7. The method of designing a shell dental appliance of claim 6, wherein generating a digital dental appliance for the current patient based on the dentition characteristic information, comprises:
acquiring characteristic parameter information of a single tooth of a patient; calculating the characteristic parameter information of the single tooth, and comparing the calculation result with a second preset threshold value to screen out at least one correction target tooth; selecting at least one candidate tooth data set matched with the target tooth after tooth correction from a database; acquiring dental arch characteristic parameter information of a patient, and combining the candidate tooth dataset and the dental arch characteristic parameter information of the patient to acquire parameter information of the dental arch of the patient after the patient is about to correct; and taking the correction target teeth as an initial state and taking the dental arches after the correction as target states, correcting and arranging the correction target teeth, and designing a digital correction scheme of the teeth to be corrected.
8. The method of designing a shell dental appliance of claim 7, further comprising digital appliance verification of the tooth to be corrected, comprising:
calculating the stress magnitude and/or moment magnitude and direction of the target teeth by adopting a finite element algorithm for each step of correcting the target teeth movement in the digital correction scheme, and judging whether the stress magnitude and/or moment magnitude and direction are in a preset range or not; if yes, outputting a digital correction scheme of the teeth to be corrected, wherein the digital correction scheme comprises step-by-step information; if not, changing the first preset threshold value or the second preset threshold value, and screening the candidate dental arch or the candidate teeth in the database again for design.
9. The method of designing a shell dental appliance of claim 6 or 7, further comprising an bite relationship classification step prior to generating a digital dental appliance of the current patient based on the dentition characteristic information, comprising:
acquiring occlusion information in the initial dentition model information;
comparing the occlusion information with the occlusion information of a reference model to obtain occlusion classification information of initial dentition;
And screening a database of corresponding occlusion types according to the occlusion classification information.
10. The method of designing a shell dental appliance of any one of claims 1-7, further comprising obtaining confirmation of a doctor, patient, to the digital dental appliance prior to generating a digital model of the shell dental appliance according to the digital dental appliance protocol.
11. The method of designing a shell-like dental appliance of claim 10, wherein the obtaining of the doctor's and patient's confirmation of the digitized dental appliance regimen comprises:
acquiring personal information of a patient, and generating patient file information containing information of teeth to be corrected of the patient;
retrieving doctor information and matching the doctor information with the patient file information;
pushing the matched doctor information to the patient, and obtaining the confirmation information of the doctor and the patient on the digital correction scheme.
12. A system for preparing a shell-shaped dental appliance, comprising: the device comprises an information acquisition module, a shell-shaped tooth appliance design module and a preparation module;
the information acquisition module is used for acquiring initial dentition model information of a patient;
A shell dental appliance design module configured to generate a shell dental appliance digital model using the shell dental appliance design method of any one of claims 1-11;
the preparation module is used for preparing the shell-shaped dental appliance based on the shell-shaped dental appliance digital model.
13. A method of making a shell dental appliance comprising:
acquiring initial dentition model information of a patient, wherein the initial dentition model information at least comprises tooth information, dental arch information and occlusion information;
comparing the initial dentition model information with dentition information of a reference model to obtain dentition characteristic information of a patient, wherein the dentition characteristic information at least comprises single tooth characteristic parameter information and dental arch characteristic parameter information; wherein the reference model comprises at least one of a standard model, a big data fitting model and a classification model;
generating a digital dental correction scheme of the current patient according to the dentition characteristic information;
generating a shell-shaped dental appliance digital model according to the digital dental appliance scheme;
preparing a shell dental appliance from the shell dental appliance digital model;
wherein the acquiring initial dentition model information of the patient comprises:
Acquiring intraoral data of a patient;
acquiring the initial dentition model of a patient based on the intraoral data, identifying a dentition arrangement of the initial dentition model, and determining tooth labels of individual teeth in the initial dentition model through the dentition arrangement; and acquiring relative position parameters of the dental arch based on the dental position arrangement and the tooth marks, and measuring and establishing the parameters of the dental arch.
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| CN112869894A (en) | 2021-06-01 |
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