CN107704699A - Analysis method, terminal and computer-readable recording medium - Google Patents
Analysis method, terminal and computer-readable recording medium Download PDFInfo
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- 238000004458 analytical method Methods 0.000 title claims abstract description 87
- 210000000214 mouth Anatomy 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 42
- 230000000694 effects Effects 0.000 claims abstract description 34
- 238000012937 correction Methods 0.000 claims description 31
- 210000000988 bone and bone Anatomy 0.000 claims description 14
- 210000003781 tooth socket Anatomy 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 210000002379 periodontal ligament Anatomy 0.000 claims description 6
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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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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Abstract
Embodiment of the present invention is related to orthodontic technical field, discloses a kind of analysis method, terminal and computer-readable recording medium.In the present invention, analysis method includes：Pre-establish oral cavity model；After analysis instruction is received, the parameter information according to needed for clinical requirement is every component setting analysis in oral cavity model；According to parameter information, tooth caused offset in the case where annex applies different stress is determined with limited element analysis technique；The graph of a relation of annex offset and lifting surface area is drawn according to the lifting surface area of offset and annex, determines influence of the annex to orthodontic effect.Analysis method, terminal and the computer-readable recording medium that embodiment of the present invention provides, can accurately analyze annex under different installation sites, different stressing conditions, the influence to orthodontic effect.
Description
Technical Field
The embodiment of the invention relates to the technical field of tooth correction, in particular to an analysis method, a terminal and a computer readable storage medium.
Background
Invisible orthodontic treatment is introduced as a brand-new orthodontic treatment technology, and is popular among teeth beautifiers because the invisible orthodontic treatment does not have steel wires and brackets in the traditional orthodontic treatment process and does not influence the attractive appearance. For traditional dentognathic deformity unscrambler, stealthy is rescued the technique, does not need to hold in the palm groove and steel wire, and what adopted is a series of stealthy and rescued the ware, and this stealthy is rescued the ware and is made by safe transparent macromolecular material of elasticity, makes and rescues the process and accomplishes in other people are unaware almost, does not influence daily life and social. Meanwhile, the method has the advantages of no complication of bonding the bracket and adjusting the arch wire, greatly simplified clinical operation and time and labor saving in the whole correcting process.
At present, in the stealthy in-process of rectifying of tooth, the tooth that needs to be assisted to adopt annex (the preparation of photocuring resin, the auxiliary device of bonding on the tooth surface) removes and the fixed of correcting the ware to reach and prevent stealthy ware or the stealthy facing slippage from the tooth, and can also adjust the stress point between stealthy ware (or stealthy facing) of correcting and the annex promptly its stress position through designing different shapes, realize to multiple effects of correcting such as tooth skew, rotation, translation.
However, the inventors found that at least the following problems exist in the prior art: in practical applications, the final orthodontic effect of the teeth may deviate greatly from the expected orthodontic effect due to the position and stress of the attachment mounted on the teeth. The way in which such deviations are reduced is currently generally judged by medical personnel based on practical experience. However, such a method relying on personal experience often has a large error, and cannot ensure the tooth correction effect.
Disclosure of Invention
The embodiment of the invention aims to provide an analysis method, a terminal and a computer readable storage medium, which can accurately analyze the influence of an accessory on the tooth correcting effect under different installation positions and different stress conditions, so that a clinician can conveniently adjust the accessory in time, and the tooth correcting effect can reach the expected effect.
In order to solve the technical problems, the embodiment of the invention provides an analysis method, which is applied to the invisible tooth correction and used for analyzing the tooth correction effect of an accessory. The analysis method comprises the following steps: pre-establishing an oral cavity model; the oral cavity model comprises at least one accessory, and the accessory is arranged on a preset area of teeth in the oral cavity model; after receiving an analysis instruction, setting parameter information required by analysis for each component in the oral cavity model according to clinical requirements; determining the offset of the teeth under different stresses applied to the accessory by using a finite element analysis method according to the parameter information; drawing a relation graph of the accessory offset and the stress area according to the offset and the stress area of the accessory, and determining the influence of the accessory on the tooth correcting effect; wherein, the stress area is the contact area of the accessory and the tooth socket.
The embodiment of the invention also provides a terminal, which comprises at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the analysis method according to any of the embodiments of the present invention.
Embodiments of the present invention also provide a computer-readable storage medium storing a computer program, and the computer program can implement the analysis method according to any embodiment of the present invention when executed by a processor.
Compared with the prior art, the embodiment of the invention provides a method for analyzing the tooth correcting effect of an attachment in recessive tooth correction. By pre-establishing an oral cavity model comprising at least one accessory, after receiving an analysis instruction, setting specific parameter information required by analysis for each component in the oral cavity model according to clinical requirements, such as specifically designated correction targets, overlay coverage relations, teeth needing correction, gaps to be reserved, immovable teeth, the direction and distance of whether the midline is maintained or shifted and the like by a clinician. After the parameter information is set, the finite element analysis method is used for determining that the teeth exert different stresses on the accessory (namely, the orthodontic force generated by the deformation of the tooth socket is transmitted to the teeth through the accessory), and determining the offset of the teeth under different stresses. In practical application, the accessory is rigidly connected with the tooth, so that the offset of the tooth is also the offset of the accessory, and then a relation graph of the offset of the accessory and the stress area of the accessory can be drawn according to the obtained offset and the contact area of the accessory and the tooth socket installed on the tooth, so that the influence of the accessory on the tooth correcting effect can be obtained when the accessory is installed at different positions, different stresses and different stress areas, clinical medical personnel can adjust the accessory in time according to the obtained relation graph, and the tooth correcting effect can achieve the expected effect.
In addition, the method for establishing the oral cavity model in advance specifically comprises the following steps: creating an oral cavity model from the clinical data; alternatively, the patient's oral data is acquired using a three-dimensional scanning technique, and an oral model is created from the acquired oral data. According to the invention, the oral cavity model is created by utilizing clinical data, such as collection of oral cavity data of a patient, oral cavity data of experimental simulation and the like, so that the analysis method can be applied to various types of oral cavity models, and the test is enriched. The oral data of the patient is collected by utilizing the three-dimensional scanning technology, and the oral model is directly created according to the oral data obtained by scanning, so that the analysis result is more accurate, and the clinical treatment is convenient.
In addition, after the oral cavity model is created, the analysis method further comprises: determining teeth to be corrected, and performing zone division on the teeth to be corrected according to a preset zone division requirement; at least one accessory is mounted for each zone. In the process of correcting the teeth, the correcting force applied to the teeth is generated by deformation of the tooth socket, and the accessories are a transmission object which is arranged between the tooth socket and the teeth directly, so after the teeth to be corrected are determined, the teeth to be corrected are divided into regions according to the preset region division requirements, such as division of the regions, the area and the shape of each region and the like, the teeth to be corrected are divided into the regions, and at least one accessory is installed for each divided region, so that in the process of correcting the teeth, the effect of applying different forces to the accessories can be achieved by installing the accessories in different regions, and further in subsequent analysis, the accessories can be conveniently arranged in different regions, different forces are applied, and the influence on the tooth correcting effect is achieved.
In addition, before determining the offset of the tooth under different forces applied by the attachment using finite element analysis based on the parameter information, the analysis method further comprises: and carrying out meshing on the oral cavity model according to a preset meshing requirement. The method is characterized in that the finite element analysis method is used for determining the offset of the tooth under different stresses of the accessory, the oral cavity model is divided into a proper number of grids by carrying out grid division on the oral cavity model, each divided grid can be independently analyzed in the analysis process, and then the analysis speed can be increased while the accuracy of the analysis result is ensured.
In addition, the oral cavity model includes teeth, braces, alveolar bone and periodontal ligament. The oral cavity model created in the embodiment of the invention not only comprises three components of teeth, braces and accessories which are necessary in the tooth correcting process, but also adds alveolar bones and periodontal ligament, enriches the setting objects of parameter information, and ensures that the analysis result of the accessories on the tooth correcting effect is more accurate.
In addition, the parameter information specifically includes: material coefficient, friction coefficient, stress coefficient, and constraint coefficient.
In addition, the constraint coefficients specifically include normal constraint coefficients for the teeth and fixed preset coefficients for the alveolar bone base. Through the two constraint coefficients, the deformation of the alveolar bone can be accurately obtained during analysis, and the influence of the accessory on the tooth correcting effect can be accurately obtained.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a flow chart of an analysis method according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a semi-ellipsoidal attachment in accordance with a first embodiment of the invention;
FIG. 3 is a schematic diagram of a tooth to be corrected after zone division according to a preset zone division requirement in the first embodiment of the present invention;
FIG. 4 is a graph of attachment deflection versus force area for an optimized retention attachment in accordance with a first embodiment of the present invention;
FIG. 5 is a graph of the deflection of the attachment versus the force-receiving area for a quarter-ellipsoid attachment as the attachment in the first embodiment of the present invention;
FIG. 6 is a graph of the relationship between the deflection of the attachment and the force-receiving area when the attachment is a semi-ellipsoidal attachment according to the first embodiment of the present invention;
FIG. 7 is a graph of the offset of the attachment versus the force-receiving area for a vertical trapezoidal attachment in accordance with the first embodiment of the present invention;
FIG. 8 is a graph of the deflection of the attachment plotted against the force-receiving area when the quarter-ellipsoid attachment is mounted in the middle of the insert according to the first embodiment of the present invention;
FIG. 9 is a graph of the deflection of the attachment versus the force area of the attachment according to the first embodiment of the present invention when the quarter-ellipsoid attachment is mounted in the center of a tooth;
FIG. 10 is a graph of the deflection of the attachment versus the force-receiving area of the attachment according to the first embodiment of the present invention when the four attachments are mounted on the middle of the tooth;
FIG. 11 is a flow chart of an analysis method according to a second embodiment of the present invention;
fig. 12 is a schematic configuration diagram of a terminal according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
A first embodiment of the present invention relates to an analysis method. It should be noted that the analysis method provided in this embodiment is mainly applied to invisible tooth correction, and the accessory analyzes the tooth correction effect. The analysis method can be operated in any dental appliance simulation system supporting a lead-based dental appliance, and the dental appliance simulation system can be specifically a dental appliance simulation system which can be developed through JScript (Java description Language, JavaScript) and Xml (extended programming Language) programming languages and can be used on a client platform by utilizing a seamless interface technology of an existing strong finite element solver of finite element analysis software Ansys, an Ansys client development platform and computer aided design software CAD.
In addition, in order to ensure that the analysis method can be performed normally, an oral cavity model needs to be established in advance, and at least one accessory needs to be included in the created oral cavity model. The attachment is specifically mounted on a predetermined area of a tooth in the oral model.
Fig. 1 shows a schematic diagram of a common attachment, specifically a semi-ellipsoidal attachment, and in practical application and simulation test, the attachment may have various forms, such as a common optimized retention attachment, a quarter-ellipsoidal attachment, a vertical trapezoidal attachment, etc., which are not listed here, and those skilled in the art may select an appropriate attachment as needed, which is not limited here.
The pre-established oral cavity model in this embodiment may be specifically created according to clinical data, such as collection of oral cavity data of a patient, oral cavity data of a trial simulation, and the like. The three-dimensional scanning technology can be used for accurately scanning the oral cavity of a patient, the oral cavity data of the patient are collected, and then an oral cavity model is created according to the collected oral cavity data.
In addition, in order to enrich the setting objects of the parameter information in the subsequent analysis process and make the analysis result of the attachment on the tooth correction effect more accurate, the oral cavity model created in the embodiment mainly comprises the attachment, the teeth, the tooth sockets, the alveolar bones and the periodontal ligament. In practical applications, those skilled in the art can reasonably set the setting according to practical needs, and the setting is not limited herein.
In addition, it is worth mentioning that, in the embodiment, after the oral cavity model is created, the teeth to be corrected are determined, after the teeth to be corrected are determined, the teeth to be corrected are subjected to zone division according to a preset zone division requirement, and at least one attachment is installed for each zone.
The requirements for the zone division may include, for example, the tooth surface to be corrected is divided into several zones, the size of each zone, the shape of each zone, etc., and the zone division may be set by the clinical staff according to the actual state of the created oral cavity model, which is not limited herein.
As shown in fig. 2, in this embodiment, a preferred dividing method is provided, specifically, teeth to be corrected are divided in a grid manner of "well" to obtain A, B, C, D, E, F, G, H, L nine regions shown in fig. 2, and 4 attachments (not shown) are respectively installed in each region, specifically, one of 4 attachments, namely, an optimized retention attachment, a quarter-ellipsoid attachment, a semi-ellipsoid attachment, and a vertical trapezoid attachment.
It should be noted that, in practical applications, the installation position of the accessories, the type of the accessories, and the number of the accessories may be set by the clinical medical staff according to needs, and are not limited herein.
In addition, the analysis method provided in this embodiment mainly utilizes workbench in ansys software to implement analysis, and since the software is mature, details of how to introduce the created oral cavity model into the analysis module in the software are not repeated here.
The following describes a specific operation flow of the analysis method, and the specific flow is shown in fig. 3:
in step 301, parameter information required for analysis is set for each component in the oral cavity model according to clinical requirements.
Specifically, step 301 needs to be executed after receiving the analysis instruction.
The clinical requirements in this embodiment may be treatment schemes that are explicitly specified by clinical medical staff, such as a correction target, a draping coverage relation, a cuspid state, a molar state, a posterior teeth locking jaw, a dentition gap and crowding, an anchorage design scheme, teeth that need to be corrected, a gap to be reserved, teeth that are not allowed to be sliced, teeth that are not capable of being bonded with attachments, immovable teeth, a direction and a distance in which a midline is maintained or shifted, and the like.
In addition, the parameter information required for the analysis of the settings of the various components in the oral cavity model specifically includes material coefficients, friction coefficients, stress coefficients and constraint coefficients.
The material coefficients may be set according to the difference between the young's modulus and the poisson ratio of the tooth, alveolar bone, attachment, etc., and may be specifically set as shown in table 1, but not limited thereto, and the material coefficients set in table 1 are only used for reference, and do not limit the technical scheme of the present invention.
| Material | Young's modulus | Poisson ratio |
| Alveolar bone | 1.37×103 | 0.30 |
| Tooth with tooth-like structure | 1.96×104 | 0.30 |
| Accessories | 12.5×103 | 0.36 |
TABLE 1
Regarding the setting of the friction coefficient (i.e., the setting of the contact between the surfaces), since the movement of each component in the oral cavity model is sliding in the dental correction process according to the present embodiment, the contact type may be set to frictive. The specific friction coefficient can be set according to actual needs, for example, the friction coefficients between the tooth and the periodontal ligament and between the periodontal ligament and the alveolar bone in the embodiment are all between 0.8 and 1.5.
Because the oral cavity models created according to different data are various in types, the friction coefficient is not fixed, and the set is reasonably set by a person skilled in the art according to actual needs, and the deviation trends of the teeth under different conditions can be shown in the process of comparing groups with one another, so that the expected simulation purpose can be achieved.
In addition, it should be noted that the orthodontic force required for orthodontic specifically comes from the mouthpiece worn, and the attachment is mounted on the tooth and is in close contact with the inner wall of the mouthpiece, so the orthodontic force generated by deformation of the mouthpiece is mainly transmitted through the attachment and applied to the tooth, and then the tooth is driven to shift. In the real situation, the force applied to the attachment is various, and the mechanical effect applied to the same attachment is not only a few, but the main force applied to the attachment always acts in the correcting process so as to achieve the correcting effect.
Regarding the setting of the stress coefficient, in the embodiment, the approximate stress direction, or stress trend, of the three attachments in the tooth correction process is mainly selected, and the stress area is changed for many times, so that the force is unified between 0.5N and 2.5N, and the stress area is mainly between 0.1 and 0.8 square millimeters.
Regarding the setting of the constraint coefficients, the present embodiment is mainly set for two aspects, namely, the normal constraint coefficients for the teeth and the fixed preset coefficients for the alveolar bone base.
The normal constraint coefficient of the tooth can be set specifically by rotating along an axis in the vertical direction, but the movement in the front, back, left and right directions is limited on the plane, so that a Remote Displacement constraint command in the ansys software can be selected to select the tooth root of the tooth, and a Fixed fulcrum Fixed Support constraint command in the ansys software can be selected to constrain the bottom surface of the alveolar bone aiming at the setting of a Fixed preset system of the alveolar bone base, so that the deformation of the alveolar bone can be observed in subsequent analysis.
The above description is only for illustrative purposes and does not limit the technical aspects of the present invention.
In step 302, the amount of deflection of the tooth under different forces applied to the attachment is determined using finite element analysis based on the parameter information.
For convenience of understanding, the following 4 attachments selected from the optimized retention attachment, the quarter-ellipsoid attachment, the half-ellipsoid attachment and the vertical trapezoid attachment in the present embodiment are respectively disposed in B, E, H areas shown in fig. 2, and the maximum offset obtained when the force-bearing area of the attachment is respectively one area unit, two area units and three area units is detailed in tables 2 to 4, where the area unit is specifically 0.5 to 0.8 mm.
TABLE 2 maximum tooth offset (mm) in units of area
TABLE 3 maximum deflection of teeth in units of two areas (mm)
TABLE 4 maximum deflection of teeth in units of three areas (mm)
In step 303, a relationship graph of the attachment offset and the force-receiving area is drawn according to the offset and the force-receiving area of the attachment, and the influence of the attachment on the tooth correcting effect is determined.
It should be noted that the force-bearing area of the attachment specifically refers to the contact area between the attachment and the mouthpiece, and the size of this area is mainly determined by the shape of the attachment.
And (4) drawing a relation graph of the offset of the accessory and the force-bearing area according to the offset obtained in the step 302 and the force-bearing area of the accessory, specifically as shown in fig. 4 to 7.
Specifically, FIG. 4 is a graph illustrating the maximum deflection of the optimized retention attachment versus the force area. Wherein, the line denoted by 4B represents the variation trend of the offset and the force-receiving area when the tooth is installed in the region B of fig. 2; the line denoted by 4E represents the trend of the variation of the offset amount and the force-receiving area when installed in the region E of the tooth shown in fig. 2; the line denoted by 4H represents the trend of the variation of the amount of deflection with the force-receiving area, which is installed in the H region of the tooth shown in fig. 2.
As can be seen from FIG. 4, when the optimized retention attachment is installed on the upper portion of the tooth, i.e., the region B, the maximum deflection of the tooth gradually decreases as the force-bearing area increases; when the optimized retention accessory is arranged in the middle of the tooth, namely in the E area, the maximum offset of the tooth does not change greatly along with the increase of the stressed area; when the optimized retention attachment is installed on the lower portion of the tooth, i.e., the H region, the maximum deflection of the tooth will increase slowly with increasing force-bearing area. From the view of total offset, when the orthodontic bracket is arranged in the middle, the average value of the maximum offset is large, the fluctuation range is small, and the orthodontic bracket is easier to operate in actual tooth correction. Thus, from a number of considerations, it is believed that optimal correction results when optimizing the attachment to the immediate center of the tooth.
Figure 5 is a graph of the maximum deflection of a quarter-ellipsoid attachment versus force-bearing area. Wherein, the line 5B represents the variation trend of the offset and the force-bearing area when the tooth is installed in the area B of the tooth shown in FIG. 2; the line denoted by 5E represents the trend of the variation of the offset amount and the force-receiving area when installed in the E region of the tooth shown in FIG. 2; the line denoted by 5H represents the trend of the shift amount versus the force-receiving area of the tooth mounted in the H region shown in fig. 2.
As can be seen from FIG. 5, when the quarter-ellipsoid attachment is mounted on the upper portion of the tooth, the maximum deflection of the tooth decreases slowly with increasing force-bearing area; when the quarter ellipsoid accessory is arranged in the middle of the tooth, the maximum offset of the tooth is slowly reduced along with the increase of the stressed area; when the quarter-ellipsoid attachment is mounted on the lower part of a tooth, the maximum deflection of the tooth decreases slowly with increasing force-bearing area. In general, when the orthodontic bracket is installed in the middle, the average value of the maximum offset is the largest, the fluctuation range is small, and the orthodontic bracket is easy to operate in actual tooth correction. Thus, the quarter ellipsoid attachment can be considered to be optimally fitted to the mid-tooth for correction.
FIG. 6 is a graph of maximum deflection of a semi-ellipsoidal appendage as a function of force area. Wherein, the line shown in 6B represents the variation trend of the offset and the force-bearing area when the tooth is installed in the area B of the tooth shown in FIG. 2; the line denoted by 6E represents the trend of the variation of the offset amount and the force-receiving area when installed in the E region of the tooth shown in FIG. 2; the line indicated by 6H represents the trend of the shift amount versus the force-receiving area of the tooth mounted in the H region shown in fig. 2.
As can be seen from fig. 6, when the semi-ellipsoidal fitting is mounted on the upper part of the tooth, the maximum offset of the tooth increases first and then decreases with the increase of the force-bearing area; when the semi-ellipsoid accessory is arranged in the middle of the tooth, the maximum offset of the tooth is gradually reduced along with the increase of the stressed area; when the semi-ellipsoidal fitting is mounted on the lower portion of a tooth, the maximum deflection of the tooth increases and then decreases as the force-bearing area increases. In general, considering that the minimum stressed area is at least 1 unit area in the actual correction process, the situation that the stressed area is smaller than 0.5 square millimeter can be ignored, and at the moment, the maximum offset mean value when the device is installed in the middle part is the largest, and the maximum offset mean value is larger and the fluctuation is smaller when the device is installed in the upper part. Therefore, from various factors, it is considered that the correction effect of the upper portion and the middle portion is excellent.
FIG. 7 is a graph of maximum deflection versus force area for a vertical trapezoidal attachment. Wherein, the line 7B represents the variation trend of the offset and the force-bearing area when the tooth is installed in the area B of the tooth shown in FIG. 2; the line denoted by 7E represents the trend of the variation of the offset amount and the force-receiving area when installed in the region E of the tooth shown in fig. 2; the line denoted by 7H represents the trend of the shift amount versus the force-receiving area of the tooth mounted in the H region shown in fig. 2.
As can be seen from FIG. 7, when the vertical trapezoidal attachment is mounted on the upper portion of the tooth, the maximum deflection of the tooth will remain substantially constant with the change of the force-bearing area; when the vertical trapezoidal accessory is arranged in the middle of the tooth, the maximum offset of the tooth is basically kept unchanged along with the change of the stressed area; when the vertical trapezoidal attachment is mounted on the lower portion of a tooth, the maximum deflection of the tooth is gradually reduced along with the increase of the force-bearing area. When the device is arranged in the middle and the upper part, the average value of the maximum offset is large, and the fluctuation is small. Therefore, it is considered that the effect of correction by fitting to the upper portion and the middle portion is excellent in actual correction.
From the above analysis, it can be seen that, for most of the common attachments, the attachment can achieve a better correction effect when being mounted in the middle of the tooth. On the basis, the present embodiment further analyzes the influence of different force-bearing areas of the same attachment installed in the middle of the body on the maximum offset, and the following example takes a quarter-ellipsoid attachment as an example to analyze, as shown in fig. 8 and 9.
Specifically, fig. 8 is a Gaussian-Gaussian fit curve of the maximum offset when the quarter-ellipsoid attachment is mounted in the middle right portion, and fig. 9 is a least-squares fit curve of the maximum offset when the quarter-ellipsoid attachment is mounted in the middle right portion.
As can be seen from fig. 8 and 9, when the quarter-ellipsoid attachment is installed in the middle of a tooth, the maximum deflection of the tooth increases and then decreases as the force-bearing area increases. Combining with the actual correction condition, when the stressed area is in one unit area and two unit areas, the correction effect is better, and the maximum offset is larger.
The other three attachment analysis methods are the same as this method and will not be described herein. With the analysis method provided in this embodiment, it can be obtained that: for most common accessories, the orthodontic appliance is arranged right in the middle of teeth, and the orthodontic effect is best when the stressed area is 1-2 unit areas.
On the basis of the conclusion, the embodiment further analyzes the situation that the accessories are installed at the same position and the stressed area is 1-2 unit areas, and by combining the data, matlab software can be used for drawing a curve chart shown in fig. 10.
As can be seen from fig. 10, when four different attachments are installed at the same position in the middle of the tooth, and the force-bearing areas are all 1-2 unit areas, the magnitude relationship between the maximum deviation averages is: quarter ellipsoid > half ellipsoid > optimal retention > vertical trapezoid. And the maximum offset curve fluctuation of the quarter ellipsoid attachment is small, so that the correction effect by using the quarter ellipsoid attachment is the best, but in practical application, clinical medical staff can select different attachments according to the actual oral cavity model of a patient, select the best attachment for tooth correction by using the analysis method, and reasonably adjust the setting position, the stress area and the like of the attachment according to the curve graph obtained by analysis, and the details are not repeated here.
The above description is only for illustrative purposes and does not limit the technical aspects of the present invention.
Compared with the prior art, the analysis method for the tooth correcting effect of the attachment in the hidden tooth correction provided by the embodiment is an analysis method for the tooth correcting effect of the attachment. By pre-establishing an oral cavity model comprising at least one accessory, after receiving an analysis instruction, setting specific parameter information required by analysis for each component in the oral cavity model according to clinical requirements, such as specifically designated correction targets, overlay coverage relations, teeth needing correction, gaps to be reserved, immovable teeth, the direction and distance of whether the midline is maintained or shifted and the like by a clinician. After the parameter information is set, the finite element analysis method is used for determining that the teeth exert different stresses on the accessory (namely, the orthodontic force generated by the deformation of the tooth socket is transmitted to the teeth through the accessory), and determining the offset of the teeth under different stresses. In practical application, the accessory is rigidly connected with the tooth, so that the offset of the tooth is also the offset of the accessory, and then a relation graph of the offset of the accessory and the stress area of the accessory can be drawn according to the obtained offset and the contact area of the accessory and the tooth socket installed on the tooth, so that the influence of the accessory on the tooth correcting effect can be obtained when the accessory is installed at different positions, different stresses and different stress areas, clinical medical personnel can adjust the accessory in time according to the obtained relation graph, and the tooth correcting effect can achieve the expected effect.
A second embodiment of the present invention relates to an analysis method. This embodiment is substantially the same as the first embodiment, and mainly differs therefrom in that: in this embodiment, before determining the offset of the tooth under different forces applied to the attachment by using a finite element analysis method according to the parameter information, the oral cavity model is gridded according to the preset gridding requirement, and the specific flow is as shown in fig. 11.
Specifically, the present embodiment includes step 1101 to step 1104, where step 1101 is substantially the same as step 301 in the first embodiment, and step 1103 and step 1104 are substantially the same as step 302 and step 303 in the first embodiment, respectively, and are not repeated here, and the following differences are mainly introduced:
in step 1102, the oral model is gridded according to a preset gridding requirement.
Specifically, the operation of meshing the oral cavity model can be specifically divided into three steps, namely firstly defining unit attributes required for dividing the oral cavity model according to preset mesh requirements, then generating a control instruction according to the defined mesh, and finally meshing the oral cavity model according to the defined unit attributes and the mesh generation control instruction.
Since the operation of meshing the oral cavity model is mature, a person skilled in the art can set the meshing requirement according to actual needs, and mesh the oral cavity model according to the preset meshing requirement, which is not described herein again.
In addition, it is worth mentioning that in practical application, when the oral cavity model is subjected to mesh division operation, due to the fact that the number of division is too large, when a finite element analysis method is used for analysis, the processed objects are too large, the processing time is prolonged, and more resources are occupied. In addition, the smaller the area of each grid is, the less effective parameter information is carried, so that the more and more dense grids are not divided, and the more accurate the final analysis result is.
In this embodiment, through a plurality of tests, the mesh division requirement is set as: the diameter of the grid obtained after the grid division operation is required to be set to be about 0.5mm, so that the speed and the accuracy of the analysis process are effectively ensured.
It should be noted that the above is only an example, and does not limit the technical solution of the present invention, and in practical applications, those skilled in the art may reasonably set the network partition requirement according to the actual situation, and the present invention is not limited herein.
According to the method, the mesh division is carried out on the oral cavity model before the offset of the teeth under different stresses is determined by using a finite element analysis method, the oral cavity model is divided into the meshes with proper quantity, each divided mesh can be analyzed independently in the analysis process, and then the meshes are collected, so that the analysis speed can be increased while the accuracy of the analysis result is ensured.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
A third embodiment of the present invention relates to a terminal, as shown in fig. 12.
The terminal includes: one or more processors 1201 and a memory 1202, one processor 1201 being exemplified in fig. 12. The processor 1201 and the memory 1202 may be connected by a bus or other means, and fig. 12 illustrates an example of the bus connection. Memory 1202, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the area partitioning requirements, grid partitioning requirements, etc. that are preset in any of the method embodiments of the present invention, which are stored in memory 1202. The processor 1201 executes various functional applications of the device and data processing, i.e. implements the analysis method referred to in any of the method embodiments described above, by running non-volatile software programs, instructions and modules stored in the memory 1202.
The memory 1202 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store a list of options, etc. Further, the memory 1202 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 1202 may optionally include memory located remotely from processor 1201, which may be connected to an external device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more modules are stored in the memory 1202, which when executed by the one or more processors 1201 perform the analysis methods described in any of the method embodiments above.
The product can execute the method provided by the embodiment of the application, has corresponding functional modules and beneficial effects of the execution method, does not have detailed technical details in the embodiment, and can refer to the analysis method related to any method implementation of the invention.
A fourth embodiment of the present invention relates to a computer-readable storage medium storing a computer program. The computer program, when executed by a processor, implements the analysis method provided by any of the embodiments of the present invention.
That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the above embodiments may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments for practicing the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (9)
1. The analysis method is characterized in that the method is applied to invisible tooth correction, and an accessory analyzes the tooth correction effect; the analysis method comprises the following steps:
pre-establishing an oral cavity model; wherein the oral cavity model comprises at least one accessory, and the accessory is arranged on a preset area of the teeth in the oral cavity model;
after receiving an analysis instruction, setting parameter information required by analysis for each component in the oral cavity model according to clinical requirements;
determining the offset of the tooth under different stresses applied to the accessory by using a finite element analysis method according to the parameter information;
drawing a relation graph of the accessory offset and the stress area according to the offset and the stress area of the accessory, and determining the influence of the accessory on the tooth correcting effect; wherein the stressed area is the contact area of the accessory and the tooth socket.
2. The analysis method according to claim 1, wherein the pre-establishing an oral cavity model specifically comprises:
creating the oral cavity model from clinical data;
or,
the method comprises the steps of acquiring oral cavity data of a patient by utilizing a three-dimensional scanning technology, and creating the oral cavity model according to the acquired oral cavity data.
3. The analytical method of claim 2, wherein after the oral model is created, the analytical method further comprises:
determining teeth needing to be corrected, and performing zone division on the teeth needing to be corrected according to a preset zone division requirement;
at least one of said accessories is mounted for each zone.
4. The method of any one of claims 1 to 3, wherein prior to determining an offset of the tooth under different forces applied by the attachment using finite element analysis based on the parameter information, the method further comprises:
and carrying out meshing on the oral cavity model according to a preset meshing requirement.
5. The analytical method of any one of claims 1 to 3, wherein the oral cavity model further comprises teeth, braces, alveolar bone and periodontal ligament.
6. The analysis method according to claim 5, wherein the parameter information specifically includes: material coefficient, friction coefficient, stress coefficient, and constraint coefficient.
7. The analysis method according to claim 6, characterized in that said constraint coefficients comprise in particular a normal constraint coefficient for the teeth and a fixed preset coefficient for the alveolar bone base.
8. A terminal, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform an analysis method as claimed in any one of claims 1 to 7.
9. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the analysis method according to any one of claims 1 to 7.
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Application publication date: 20180216 |