CN109620431B - Digital arch wire selection method and device - Google Patents
Digital arch wire selection method and device Download PDFInfo
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- CN109620431B CN109620431B CN201811644606.3A CN201811644606A CN109620431B CN 109620431 B CN109620431 B CN 109620431B CN 201811644606 A CN201811644606 A CN 201811644606A CN 109620431 B CN109620431 B CN 109620431B
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- 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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- G—PHYSICS
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Abstract
The invention provides a digital tooth arrangement method and a device thereof, wherein a scanned dentition three-dimensional model is led into a computer, dentition variables are obtained according to the dentition three-dimensional model, an arch wire approach value is calculated based on the dentition variables, and a corresponding target arch wire is matched from an arch wire database based on the arch wire approach value. The digital arch wire selection method and the device thereof have simple steps, and select the most appropriate arch wire from the existing arch wires in a digital mode, thereby avoiding the error caused by selecting the arch wire by the experience of doctors, and avoiding the complicated process of acquiring the arch wire by arranging teeth on dentition and the large cost caused by manufacturing the individualized arch wire.
Description
Technical Field
The invention relates to the field of orthodontic arch wires, in particular to a digital arch wire selection method and a digital arch wire selection device.
Background
Malocclusion is a common and multiple oral disease. Malocclusion has a large impact on oral health, oral function, development of maxillofacial cranium, and appearance. Orthodontics is an essential and important component of oral health care. The arch wire is a common device used in the orthodontic correction process, and is given specific data by bending a specific arch shape, and the size of the correction force is embodied by the thickness of the arch wire. The arch wire is placed in the orthodontic appliance, and then the data of the arch wire is given to teeth, and the arch wire and the teeth mutually exert acting force to ensure that the dentition arrangement is more orderly and beautiful. The size of the arch wire and the arch shape of the arch wire are very important data of the arch wire, and the orthodontic correction effect is influenced.
In the orthodontic correction process, it is very important to select an arch wire suitable for a patient, but an orthodontist cannot select the most suitable arch wire for the patient due to different oral environments of each patient, so that the orthodontic treatment effect is influenced. There are two existing methods of selecting archwires: one method is to select the arch wire for the doctor by the experience of the doctor, but the method is easy to generate great error due to different environments and insufficient experience of the doctor; the other method is to arrange disordered dentitions into ideal dentitions by a digital dentition method and then reversely push the data of the arch wire through the ideal dentitions, but the arch wire obtained by the method is often an ideal arch wire which needs to be realized by a personalized design and customization method, so that the efficiency is low, the cost is high, and the method cannot be applied in a large scale.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for selecting the arch wire which is most suitable for a patient in a digital mode based on the existing arch wire.
The technical scheme of the invention is as follows:
the digital arch wire selection method comprises the following steps:
importing the scanned dentition three-dimensional model into a computer;
acquiring dentition variables according to the dentition three-dimensional model; the dentition variables include: A. b, C, D, E, F, respectively; wherein A is the offset of the central line of the same jaw side, B is the deviation of the torque angle 1-SN of incisors in the same jaw side from a normal value, C is the length of the connecting line of cuspid teeth tips on the two sides of the same jaw side, D is the length of the connecting line of the central sockets of the first molars on the two sides of the same jaw side, E is the length of the perpendicular bisector from the middle point of the incisors in the same jaw side to the connecting line of the central sockets of the first molars on the two sides of the same jaw side, and F is the deviation of the whole tooth segment of Bolton;
calculating an archwire approach value based on the dentition variables, the expression of which is as follows:
X＝(a-A)A+(b-B)B+(d-D)*squ(E2+(D/2)2)+(c-C)C-F
wherein X is an approach value of an arch wire, a is a tooth overlay mean value, b is a root gradient mean value, c is a mean value of a connecting line of cuspids of the canine teeth on two sides of the same jaw side, and d is a mean value of a connecting line of central pits of the first molar teeth on two sides of the same jaw side;
matching a corresponding target arch wire from an arch wire database based on the arch wire approach value.
Further, the arch wire database comprises a virtual ideal arch wire, wherein an application arch wire is arranged in the virtual ideal arch wire, the virtual ideal arch wire has a specific arch wire interval value, the arch wire approach value corresponds to the arch wire interval value, the arch wire interval value corresponds to the virtual ideal arch wire, the application arch wire is obtained based on the virtual ideal arch wire through iterative calculation, and the application arch wire is the target arch wire.
Furthermore, the arch wire database is provided with a plurality of application arch wires with specific data, the arch wire database is divided into a plurality of arch wire intervals, the arch wire intervals have arch wire interval values, and the application arch wires correspond to the arch wire intervals.
Further, the arch wire approach value corresponds to the arch wire interval value within the arch wire interval and corresponds to the application arch wire within the arch wire interval, and the application arch wire is the target arch wire.
Further, an arch wire approach value is calculated based on the dentition variable, and the expression can also be as follows: x is 0.2A +0.3B +0.8 × squ (E)2+(D/2)2)+0.6C-1.2F。
Further, the arch wire approach value comprises an upper jaw arch wire approach value, the arch wire interval value comprises an upper jaw arch wire interval value, the target arch wire comprises an upper jaw target arch wire, and the upper jaw approach value is matched with the upper jaw arch wire interval value to obtain the upper jaw target arch wire;
the arch wire approach value comprises a lower jaw arch wire approach value, the arch wire interval value comprises a lower jaw arch wire interval value, the target arch wire comprises a lower jaw target arch wire, and the lower jaw arch wire approach value is matched with the lower jaw arch wire interval value to obtain the lower jaw target arch wire.
Further, a tooth arrangement curve and a tooth arrangement plane are constructed based on the target arch wire, the translation amount and the rotation amount required by moving the teeth in the dentition three-dimensional model to the target tooth position are calculated through fitting optimization, the teeth in the dentition three-dimensional model are moved to the target tooth position, and the target dentition is generated.
Further, an upper jaw tooth arrangement curve and an upper jaw tooth arrangement plane are constructed based on the upper jaw target arch wire, the translation amount and the rotation amount required by the movement of the upper jaw teeth in the dentition three-dimensional model to the upper jaw target tooth position are calculated through fitting optimization, the upper jaw teeth are moved to the upper jaw target tooth position, and a target upper jaw dentition is generated;
and constructing a lower jaw tooth arrangement curve and a lower jaw tooth arrangement plane based on the lower jaw target arch wire, calculating the translation amount and the rotation amount required by moving the lower jaw teeth in the dentition three-dimensional model to the lower jaw target tooth position through fitting optimization, and moving the lower jaw teeth to the lower jaw target tooth position to generate a target lower jaw dentition.
Further, the tooth-arrangement plane comprises a median sagittal plane, a horizontal plane and a tooth-arrangement occlusal plane; the tooth arrangement curve comprises a tooth arrangement curve at the midpoint of a tooth crown; the target tooth positions include sagittal, vertical, and interdental positions.
Digital arch wire selection device includes:
the import module imports the scanned dentition three-dimensional model into a computer;
the acquisition module is used for acquiring dentition variables according to the dentition three-dimensional model; the dentition variables include: A. b, C, D, E, F, respectively; wherein A is the offset of the central line of the same jaw side, B is the deviation of the torque angle 1-SN of incisors in the same jaw side from a normal value, C is the length of the connecting line of cuspid teeth tips on the two sides of the same jaw side, D is the length of the connecting line of the central sockets of the first molars on the two sides of the same jaw side, E is the length of the perpendicular bisector from the middle point of the incisors in the same jaw side to the connecting line of the central sockets of the first molars on the two sides of the same jaw side, and F is the deviation of the whole tooth segment of Bolton;
a calculation module for calculating an approach value of the arch wire based on the dentition variable, wherein the expression is as follows:
X＝(a-A)A+(b-B)B+(d-D)*squ(E2+(D/2)2)+(c-C)C-F
wherein X is an approach value of an arch wire, a is a tooth overlay mean value, b is a root gradient mean value, c is a mean value of a connecting line of cuspids of the canine teeth on two sides of the same jaw side, and d is a mean value of a connecting line of central pits of the first molar teeth on two sides of the same jaw side;
and the matching module is used for matching the corresponding target arch wire from the arch wire database according to the arch wire approach value.
The invention has at least the following advantages:
1. the invention constructs the arch wire database by presetting a series of arch wires with different arch wire data, obtains the dentition variable through the dentition three-dimensional model obtained by scanning, obtains the arch wire approach value through the dentition variable, and matches the corresponding target arch wire from the arch wire database based on the arch wire approach value, so that the method has simple process for obtaining the target arch wire, obtains the arch wire most suitable for a patient through rigorous steps, and has more obvious orthodontic effect.
2. The arch wire database of the invention is provided with a series of virtual ideal arch wires, some practical and applicable application arch wires are provided in the virtual ideal arch wires, in the process of digitally selecting the arch wires, the approach values of the arch wires correspond to the arch wire interval values in the arch wire database, the arch wire interval values correspond to the virtual ideal arch wires one by one, the application arch wires with the most similar data are obtained through iterative calculation based on the virtual ideal arch wires, the application arch wires are the target arch wires selected by the digital arch wires, the steps are simple, the difficulties of designing and producing the individual arch wires are eliminated, the embarrassment of selecting the arch wires only by the experience of doctors is eliminated, and the arch wires are selected strictly and orderly.
3. The arch wire database is divided into arch wire intervals according to the difference of the data of the application arch wires, the application arch wires with specific arch wire data are arranged in each arch wire interval, the interval range of each application arch wire can be clearly divided, the distribution of the application arch wires is more standardized, and the searching and the data screening are convenient.
4. The arch wire database of the invention is provided with a series of practically existing and applicable application arch wires, a series of arch wire intervals are divided according to different data of the application arch wires, the arch wire intervals are internally provided with arch wire interval values, the arch wire approach values obtained by the dentition variable calculation can be in one-to-one correspondence with the arch wire interval values, and the arch wire interval values are positioned in the arch wire intervals and are provided with specific application arch wires, so that the arch wire approach values correspond to the application arch wires to obtain the target arch wires, the process is simple, and the target arch wires can be obtained without complicated comparison and matching.
5. The data of the invention are divided into upper and lower jaws, and the upper and lower jaws of the oral cavity have larger difference, even the upper jaw dentition and the lower jaw dentition with the same arch shape need to use arch wires with different data, so that the arch wires are divided into an upper jaw arch wire and a lower jaw arch wire, and an upper jaw arch wire approach value is calculated by the upper jaw dentition variable, so as to obtain an upper jaw target arch wire; and calculating the mandibular dentition variable to obtain the mandibular arch wire approach value so as to obtain the mandibular target arch wire. The arch wire selection process is more rigorous, different orthodontic treatment processes are carried out on the upper jaw dentition and the lower jaw dentition, different arch wires are used, and orthodontic correction is more accurate.
6. The invention can also arrange teeth through the target arch wire, the target arch wire is selected as a reference datum in the tooth arrangement process, a tooth arrangement plane and a tooth arrangement curve are constructed, the target tooth position is further obtained according to fitting optimization, and the target dentition is finally generated.
7. According to the invention, an upper jaw tooth arrangement curve and an upper jaw tooth arrangement plane are constructed by calculating an upper jaw target arch wire, and the translation amount and the rotation amount required by moving to a target tooth position are calculated through fitting optimization, so that each step of the upper jaw tooth arrangement process is supported by data, and the upper jaw tooth arrangement process is more precise and accurate;
a lower jaw tooth arrangement curve and a lower jaw tooth arrangement plane are constructed through a lower jaw target arch wire, and translation amount and rotation amount required by moving to a target tooth position are calculated through fitting optimization, so that each step of a lower jaw tooth arrangement process is supported by data, and the tooth arrangement process is more precise and accurate.
8. The tooth arrangement plane comprises a median sagittal plane, a horizontal plane and a tooth arrangement occlusion plane, the tooth arrangement curve comprises a tooth crown midpoint tooth arrangement curve, and the target tooth position comprises the dentition vertical position and the interdental position by subdividing the tooth arrangement plane and the tooth arrangement curve accurately, so that the target tooth position is more accurate without generating errors.
Description of the drawings:
fig. 1 is a flowchart of a digital arch wire selection method according to an embodiment of the present invention.
Fig. 2 is a flow chart of target archwire tooth alignment according to an embodiment of the present invention.
Fig. 3 is a block diagram of a digital arch wire selecting device according to an embodiment of the present invention.
Fig. 4 is a block diagram illustrating a target-based archwire tooth arrangement in accordance with an embodiment of the present invention.
The specific implementation mode of the invention is as follows:
exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. In order to make the advantages of the technical solutions of the present invention clearer, the present invention is described in detail below with reference to the accompanying drawings and examples.
The invention provides a digital arch wire selection method, which comprises the following steps:
10. and importing the scanned dentition three-dimensional model into a computer.
The dentition three-dimensional model comprises all teeth to be orthodontics, and the teeth to be orthodontics refer to all teeth of a patient needing to be orthodontics. Before the teeth of the patient are corrected, a doctor selects a correction scheme according to the crowding condition of the dentition of the patient, judges whether tooth extraction is needed or not, and determines all teeth to be corrected of the patient. It should be noted that the dentition three-dimensional model includes tooth root data and tooth crown data, that is, information representing concave-convex of the tooth surface and information of the tooth root wrapped in the gum, and can comprehensively reflect the position and state of the tooth. The dentition three-dimensional model may be obtained by other technologies such as an oral cavity scanning technology, a computed tomography technology, and the like, and the embodiment of the present invention is not particularly limited.
And importing the acquired dentition three-dimensional model into a computer for further processing by using a computer application program.
20. And acquiring dentition variables according to the dentition three-dimensional model.
Dentition variables include A, B, C, D, E, F; wherein A is the offset of the central line of the same jaw side, B is the deviation of the torque angle 1-SN of the incisor in the same jaw side from the normal value, C is the length of the connecting line of the cuspid teeth tips on the two sides of the same jaw side, D is the length of the connecting line of the central sockets of the first molars on the two sides of the same jaw side, E is the length of the perpendicular bisector from the middle point of the incisor in the same jaw side to the connecting line of the central sockets of the first molars on the two sides of the same jaw side, and F is the deviation of the whole tooth segment of the.
30. And calculating and acquiring an arch wire approach value based on the dentition variable.
Calculating an approach value of the arch wire through an expression based on dentition variables, wherein the expression is as follows:
X＝(a-A)A+(b-B)B+(d-D)*squ(E2+(D/2)2)+(c-C)C-F
wherein X is an approach value of the arch wire, a is a mean value of tooth coverage, b is a mean value of tooth root inclination, c is a mean value of the length of a connecting line of cuspids of the canine teeth on two sides of the same jaw side, and d is a mean value of the length of a connecting line of central pits of the first molar teeth on two sides of the same jaw side.
Wherein, the mean value of tooth covering, the mean value of tooth root inclination and the mean value of the connecting line of cuspids on two sides of the same jaw side and the mean value of the connecting line of first molar fovea on two sides of the same jaw side are average statistical data of human beings in all regions.
40. The arch wire approach value is matched with a corresponding target arch wire from an arch wire database.
The arch wire database comprises arch wires with various arch wire data, the arch wire approaching values correspond to the arch wire interval values in the arch wire database one by one, and the arch wire which is most suitable for a patient is obtained through matching the arch wire interval values with the arch wires in the arch wire database, namely the target arch wire. Each arch wire approach value corresponds to an arch wire interval value, and the arch wire approach value indirectly corresponds to a target arch wire through the target arch wire with unique specific data of the arch wire interval value.
Further, in order to alleviate the difficulty in obtaining the human tooth coverage mean, the root inclination mean, the mean of the connection line between the cuspids on the two sides of the same jaw and the mean of the connection line between the central sockets of the first molars on the two sides of the same jaw, the expression for calculating the approach value of the arch wire through the expression based on the dentition variables may be: x is 0.2A +0.3B +0.8 × squ (E)2+(D/2)2)+0.6C-1.2F。
Further, because of the differences in maxillary and mandibular dentitions, maxillary and mandibular dentitions require the use of completely different archwires.
Obtaining a maxillary dentition variable through a dentition three-dimensional model: the deviation amount of the maxillary central line, the deviation of the torque angle 1-SN of the maxillary central incisor from the normal value, the length of the connection line of the cuspids of the maxillary two sides, the length of the connection line of the first molar central sockets of the maxillary two sides, the length of the central perpendicular line of the connection line of the first molar central sockets of the maxillary two sides and the deviation of the maxillary Bolton total tooth section from the standard value difference. And acquiring a maxillary dentition approach value through calculation according to the maxillary dentition variable, and acquiring a maxillary target arch wire through matching the maxillary dentition approach value with an arch wire interval value of an arch wire database.
Acquiring a mandibular dentition variable through the dentition three-dimensional model: the deviation amount of the mandible midline, the deviation of the torque angle 1-SN of incisors in the mandible from a normal value, the length of the connecting line of the cuspid dental cusps at two sides of the mandible, the length of the connecting line of the first molar central sockets at two sides of the mandible, the length of the perpendicular line of the connecting line of the first molar central sockets at two sides of the mandible and the deviation of the mandible Bolton total dental segment from a standard value difference. And acquiring a mandibular dentition approach value through calculation according to the mandibular dentition variable, and acquiring a mandibular target arch wire through matching the mandibular dentition approach value with an arch wire interval value of an arch wire database.
50. And constructing a tooth arrangement plane and a tooth arrangement curve according to the target arch wire to obtain the position of the target tooth.
And constructing a tooth arrangement curve and a tooth arrangement plane through a computer application program based on the obtained target arch wire, wherein the tooth arrangement plane comprises a median sagittal plane, a horizontal plane and a tooth arrangement occlusal plane, and the tooth arrangement curve comprises a tooth crown midpoint tooth arrangement curve. Fitting and optimizing the three-dimensional model of the dentition obtained by scanning through a computer application program based on the tooth arrangement curve and the tooth arrangement plane to obtain the target tooth position of each tooth in the ideal target dentition, and calculating the translation amount and the rotation amount required by each tooth to move to the ideal target tooth position.
60. And moving the teeth in the dentition three-dimensional model to the target tooth position to generate the target dentition.
And moving the teeth in the dentition three-dimensional model to the target tooth position to generate the target dentition. Wherein the target tooth position comprises a sagittal position, a vertical position and an interdental position. By constructing the target dentition, the physician can control the progress of orthodontic correction while enhancing the patient's confidence.
In one embodiment, the arch wire of various arch wire data is led into a computer to generate an arch wire database, and the arch wire in the arch wire database is a virtual ideal arch wire. And screening arch wire data of the available arch wires or the imported available arch wires from the arch wire database, and entering the arch wire database, wherein the available arch wires in the arch wire database are application arch wires.
Each virtual ideal arch wire has a specific arch wire interval value, and the virtual ideal arch wires correspond to the arch wire interval values one to one. When the approach value of the arch wire of the patient is obtained through computer calculation, the approach value of the arch wire is matched and corresponds to the interval value of the arch wire in the arch wire database, and the interval value of the arch wire corresponds to a specific virtual ideal arch wire, namely the approach value of the arch wire corresponds to the specific virtual ideal arch wire. Automatically judging whether the virtual ideal arch wire is an application arch wire through a computer: if the arch wire is the application arch wire, the application arch wire is directly output, and the application arch wire is the target arch wire obtained by the calculation; if the arch wire is not the application arch wire, the computer matches the application arch wire with the most similar arch wire data through iterative calculation, and the application arch wire with the most similar arch wire data to the virtual ideal arch wire data is the target arch wire obtained through the calculation.
In one embodiment, the available arch wire data of the arch wire is imported into a computer to establish an arch wire database, wherein the arch wire in the arch wire database is the application arch wire. And predicting the treatment effect of each arch wire on different malocclusion deformities according to the arch wire data of the application arch wires in the arch wire database through fitting orthodontic correction treatment operation, dividing arch wire intervals according to the predicted treatment effect, wherein each application arch wire corresponds to a specific arch wire interval, the arch wire intervals have continuous arch wire interval values, and the arch wire interval values correspond to the arch wire approach values of the patient obtained through computer calculation.
The arch wire approach value of the patient obtained by the computer calculation corresponds to the arch wire interval value of the arch wire interval of the arch wire database, the arch wire interval where the corresponding arch wire interval value is located is determined, the only application arch wire in the arch wire interval is obtained through the arch wire interval, and the application arch wire is the target arch wire obtained by the calculation.
Based on the digital arch wire selection method, the invention also provides a digital arch wire selection device, which comprises: an import module 70, an acquisition module 80, a calculation module 90 and a matching module 100. The importing module 70 is used for importing the scanned dentition three-dimensional model into a computer; the obtaining module 80 obtains dentition variables according to the dentition three-dimensional model; the dentition variables include: A. b, C, D, E, F, respectively; wherein A is the offset of the central line of the same jaw side, B is the deviation of the torque angle 1-SN of incisors in the same jaw side from a normal value, C is the length of the connecting line of cuspid teeth tips on the two sides of the same jaw side, D is the length of the connecting line of the central sockets of the first molars on the two sides of the same jaw side, E is the length of the perpendicular bisector from the middle point of the incisors in the same jaw side to the connecting line of the central sockets of the first molars on the two sides of the same jaw side, and F is the deviation of the whole tooth segment of Bolton; the calculation module 90 is configured to calculate an archwire approach value based on the dentition variables, which is expressed as follows: x ═ a (a-a) a + (B-B) B + (D-D) × squ (E2+ (D/2)2) + (C-C) C-F; wherein X is an approach value of an arch wire, a is a tooth overlay mean value, b is a root gradient mean value, c is a mean value of a connecting line of cuspids of the canine teeth on two sides of the same jaw side, and d is a mean value of a connecting line of central pits of the first molar teeth on two sides of the same jaw side; the matching module 100 is configured to match a corresponding target arch wire from an arch wire database according to the arch wire approach value.
In addition, the digital arch wire selection device of the invention also comprises: a fitting module 110 and a moving module 120. The fitting module 110 constructs a tooth arrangement curve and a tooth arrangement plane based on the target arch wire, and calculates the translation amount and the rotation amount required by the teeth in the dentition three-dimensional model to move to the target tooth position through fitting optimization; the moving module 120 is configured to move the teeth in the three-dimensional model of the dentition to the target tooth position, and generate a target dentition.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including all such alterations and modifications as fall within the true spirit and scope of the invention.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not to be understood as the limitation of the patent scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The digital arch wire selection method is characterized by comprising the following steps:
importing the scanned dentition three-dimensional model into a computer;
acquiring dentition variables according to the dentition three-dimensional model; the dentition variables include: A. b, C, D, E, F, respectively; wherein A is the offset of the central line of the same jaw side, B is the deviation of the torque angle 1-SN of incisors in the same jaw side from a normal value, C is the length of the connecting line of cuspid teeth tips on the two sides of the same jaw side, D is the length of the connecting line of the central sockets of the first molars on the two sides of the same jaw side, E is the length of the perpendicular bisector from the middle point of the incisors in the same jaw side to the connecting line of the central sockets of the first molars on the two sides of the same jaw side, and F is the deviation of the whole tooth segment of Bolton;
calculating an archwire approach value based on the dentition variables, the expression of which is as follows:
X＝(a-A)A+(b-B)B+(d-D)*squ(E2+(D/2)2)+(c-C)C-F
wherein X is an approach value of an arch wire, a is a tooth overlay mean value, b is a root gradient mean value, c is a mean value of a connecting line of cuspids of the canine teeth on two sides of the same jaw side, and d is a mean value of a connecting line of central pits of the first molar teeth on two sides of the same jaw side;
matching a corresponding target arch wire from an arch wire database based on the arch wire approach value.
2. The digital archwire selection method of claim 1, wherein the database of archwires includes virtual ideal archwires with application archwires among them, the virtual ideal archwires having specific archwire slot values, the archwire approach values corresponding to the archwire slot values, the archwire slot values corresponding to the virtual ideal archwires, the application archwires being obtained based on the virtual ideal archwires iterative calculations, the application archwires being the target archwires.
3. The digital archwire selection method of claim 1, wherein there are a number of application archwires of specific data in the archwire database and the archwire database is divided into a number of archwire intervals having archwire interval values, the application archwires corresponding to the archwire intervals.
4. The digital archwire selection method of claim 3, wherein said archwire approach values correspond to said archwire slot values within said archwire slot and to said application archwire within said archwire slot, said application archwire being said target archwire.
5. The digital archwire selection method of claim 1, wherein an archwire approach value is calculated based on said dentition variables, which may also be expressed as: x is 0.2A +0.3B +0.8 × squ (E)2+(D/2)2)+0.6C-1.2F。
6. A digital archwire selection method of any of claims 2-4, wherein said archwire approach values comprise maxillary archwire approach values, said archwire interval values comprise maxillary archwire interval values, said target archwire comprises a maxillary target archwire, said maxillary archwire approach values match said maxillary archwire interval values to obtain said maxillary target archwire;
the arch wire approach value comprises a lower jaw arch wire approach value, the arch wire interval value comprises a lower jaw arch wire interval value, the target arch wire comprises a lower jaw target arch wire, and the lower jaw arch wire approach value is matched with the lower jaw arch wire interval value to obtain the lower jaw target arch wire.
7. The digital archwire selection method of claim 6, wherein a tooth arrangement curve and a tooth arrangement plane are constructed based on the target archwire, translation and rotation amounts required for moving the teeth in the three-dimensional model of the dentition to the target tooth position are calculated through fitting optimization, and the teeth in the three-dimensional model of the dentition are moved to the target tooth position to generate the target dentition.
8. The digital arch wire selection method of claim 7, wherein a maxillary tooth arrangement curve and a maxillary tooth arrangement plane are constructed based on the maxillary target arch wire, the translation amount and the rotation amount required for moving the maxillary teeth to the maxillary target tooth position in the dentition three-dimensional model are calculated through fitting optimization, and the maxillary teeth are moved to the maxillary target tooth position to generate a target maxillary dentition;
and constructing a lower jaw tooth arrangement curve and a lower jaw tooth arrangement plane based on the lower jaw target arch wire, calculating the translation amount and the rotation amount required by moving the lower jaw teeth in the dentition three-dimensional model to the lower jaw target tooth position through fitting optimization, and moving the lower jaw teeth to the lower jaw target tooth position to generate a target lower jaw dentition.
9. The digital archwire selection method of claims 7 or 8, wherein said occlusal planes comprise a midsagittal plane, a horizontal plane, and an occlusal plane; the tooth arrangement curve comprises a tooth arrangement curve at the midpoint of a tooth crown; the target tooth positions include sagittal, vertical, and interdental positions.
10. Digital arch wire selection device, its characterized in that includes:
the import module imports the scanned dentition three-dimensional model into a computer;
the acquisition module is used for acquiring dentition variables according to the dentition three-dimensional model; the dentition variables include: A. b, C, D, E, F, respectively; wherein A is the offset of the central line of the same jaw side, B is the deviation of the torque angle 1-SN of incisors in the same jaw side from a normal value, C is the length of the connecting line of cuspid teeth tips on the two sides of the same jaw side, D is the length of the connecting line of the central sockets of the first molars on the two sides of the same jaw side, E is the length of the perpendicular bisector from the middle point of the incisors in the same jaw side to the connecting line of the central sockets of the first molars on the two sides of the same jaw side, and F is the deviation of the whole tooth segment of Bolton;
a calculation module for calculating an approach value of the arch wire based on the dentition variable, wherein the expression is as follows:
X＝(a-A)A+(b-B)B+(d-D)*squ(E2+(D/2)2)+(c-C)C-F
wherein X is an approach value of an arch wire, a is a tooth overlay mean value, b is a root gradient mean value, c is a mean value of a connecting line of cuspids of the canine teeth on two sides of the same jaw side, and d is a mean value of a connecting line of central pits of the first molar teeth on two sides of the same jaw side;
and the matching module is used for matching the corresponding target arch wire from the arch wire database according to the arch wire approach value.
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