CN113268864B - Method for evaluating bracket positioning and bonding accuracy - Google Patents
Method for evaluating bracket positioning and bonding accuracy Download PDFInfo
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- CN113268864B CN113268864B CN202110504547.5A CN202110504547A CN113268864B CN 113268864 B CN113268864 B CN 113268864B CN 202110504547 A CN202110504547 A CN 202110504547A CN 113268864 B CN113268864 B CN 113268864B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002184 metal Substances 0.000 claims description 8
- 238000010586 diagram Methods 0.000 claims description 5
- 238000013499 data model Methods 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000012937 correction Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 210000003464 cuspid Anatomy 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036346 tooth eruption Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000004513 dentition Anatomy 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 210000004195 gingiva Anatomy 0.000 description 1
- 210000004283 incisor Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 210000004225 permanent dentition Anatomy 0.000 description 1
- 230000036342 permanent tooth eruption Effects 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000036339 tooth positioning Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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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
-
- 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
-
- 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
- A61C7/12—Brackets; Arch wires; Combinations thereof; Accessories therefor
- A61C7/28—Securing arch wire to bracket
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/50—Information retrieval; Database structures therefor; File system structures therefor of still image data
- G06F16/53—Querying
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
Abstract
The application relates to an evaluation method of bracket positioning bonding accuracy, which relates to the field of bracket bonding and comprises the following steps: s1, preparing a bracket digital model and a tooth digital model; s2, a standard positioning and bonding digital model is designed in a computer-aided mode; s3, outputting a standard positioning and bonding digital model; s4, preparing brackets and teeth; s5, actually positioning and bonding the bracket to the teeth; s6, scanning and outputting an actual positioning bonding digital model by using a 3D scanner; s7, inputting the standard positioning bonding digital model and the actual positioning bonding digital model into a model comparison software to measure the deviation between the models. The method has the effect of being capable of accurately evaluating bracket positioning and bonding.
Description
Technical Field
The application relates to the field of bracket bonding, in particular to a bracket positioning bonding accuracy evaluation method.
Background
Brackets are an important component of the fixed appliance technology, and are directly adhered to the surface of the dental crown by using adhesives, and archwires apply various types of appliance force to the teeth through the brackets.
The bracket is made of stainless steel, biological ceramics or composite resin and mainly has the function of fixing the arch wire, so that the arch wire can better play a role, and the orthodontic force is transmitted, thereby controlling the three-dimensional movement of teeth and achieving the aim of orthodontic correction.
Bracket positioning bonding is an important content of orthodontic treatment process, and the accuracy of the position angle of the bracket positioning bonding directly influences the correction effect and correction period of a patient.
For the above related technologies, the inventor believes that the accuracy of positioning and bonding of the clinical bracket often depends on visual observation and evaluation, and depends on experience of doctors to a great extent, and because the viewing angle of each person is inconsistent, the unified standard cannot be achieved, the bracket and the individual teeth are small in size and often in the mouth of the patient, and actual measurement and quantitative evaluation are difficult to perform.
Disclosure of Invention
In order to make more accurate evaluation on bracket positioning adhesion, the application provides an evaluation method for bracket positioning adhesion accuracy.
The method for evaluating the bracket positioning and bonding accuracy provided by the application adopts the following technical scheme:
the method for evaluating the accuracy of bracket positioning and bonding comprises the following steps:
s1, preparing a bracket digital model and a tooth digital model;
the bracket digital model is uploaded to a software bracket database by a virtual bracket positioning and bonding software design end, and is directly called from the database when in use; the tooth digital model is scanned by a 3D scanner to be an actual tooth model, and the obtained bracket digital model and the tooth digital model are input into virtual bracket positioning and bonding software after the tooth digital model is completed;
s2, a standard positioning and bonding digital model is designed in a computer-aided mode;
bonding the dental position bracket data model and the tooth data model in virtual bracket positioning bonding software, combining and wrapping each bracket digital model and the tooth digital model which are positioned by the virtual bracket positioning bonding software, and combining the bracket and the tooth into a standard positioning bonding digital model;
s3, outputting a standard positioning and bonding digital model;
the virtual bracket positioning and bonding software outputs a model file of a standard positioning and bonding digital model;
s4, preparing brackets and teeth;
selecting a dental metal bracket matched with the bracket digital model, and using the real teeth of the patient;
s5, actually positioning and bonding the bracket to the teeth;
bonding the dental metal bracket to the patient's teeth;
s6, scanning and outputting an actual positioning bonding digital model by using a 3D scanner;
scanning the bonded dental metal bracket on the tooth by using a 3D scanner to obtain an actual positioning bonding digital model, and outputting a model file of the actual positioning bonding digital model;
s7, inputting the standard positioning bonding digital model and the actual positioning bonding digital model into a model comparison software to measure the deviation between the models.
By adopting the technical scheme, the standard positioning and bonding digital model is firstly manufactured, then a patient bonded with the bracket is scanned to obtain the actual positioning and bonding digital model bonded with the teeth, the standard positioning and bonding digital model and the actual positioning and bonding digital model are respectively led into model comparison software, the standard positioning and bonding digital model and the actual positioning and bonding digital model are compared in the model comparison software, the actual bonding error is compared, and then the bracket bonding effect is evaluated.
Optionally, the dental digital model is imported into the virtual bracket positioning and bonding software for restoration operation.
By adopting the technical scheme, the defects on the teeth are eliminated, so that the manufactured tooth digital model is more in line with the restoration process of medical staff on the teeth of a patient, and the difference between the tooth digital model and the teeth which are actually scanned is reduced.
Optionally, the standard positioning of the brackets is performed using FA point method or height method or edge ridge leveling method in the virtual bracket positioning bonding software.
By adopting the technical scheme, the bonding work of the bracket digital model and the tooth digital model can be carried out by adopting various methods.
Alternatively, a three-point alignment method is used to align the standard positional adhesive digital model with the actual positional adhesive digital model.
By adopting the technical scheme, the three-point alignment method aligns the standard positioning bonding digital model with the actual positioning bonding digital model from the three reference points, so that the comparison can be more effectively and obviously carried out.
Optionally, the tooth digital model without the bracket is subtracted from the standard positioning bond digital model and the actual positioning bond digital model using boolean operations after the alignment of the standard positioning bond digital model and the actual positioning bond digital model.
By adopting the technical scheme, the difference can be conveniently obtained by staff.
Optionally, the standard positioning bond digital model comprises characteristic data of the body, the bottom plate, the groove and the midline of the bracket and data of the proximal-distal, gingival occlusal orientation, labial (buccal) lingual position and torque, axial inclination and compensation angles of the bracket digital model relative to the tooth digital model.
Through adopting above-mentioned technical scheme, set up a plurality of datum points, compare from a plurality of datum points, conveniently compare, be favorable to the derivation of difference.
Optionally, after the standard positioning bonding digital model is compared with the actual positioning bonding digital model, outputting data of the bracket including the near-far middle position, the gingival and tooth alignment direction, the labial (buccal) lingual position and torque, the axis inclination, the offset angle deviation, the offset tone scale map, the minimum deviation, the maximum deviation, the average deviation and the percentage in the tolerance.
By adopting the technical scheme, the differences are compared from multiple aspects, and the obvious degree of the differences is improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the standard positioning bonding digital model is obtained through software and is compared with the actual positioning bonding digital model, the actual bonding error is compared, and then the bonding effect of the bracket is evaluated;
2. by comparing various data, a more accurate difference result is effectively obtained;
3. through setting up a plurality of datum points, conveniently contrast the location.
Drawings
FIG. 1 is a schematic diagram of the steps of the method for evaluating the accuracy of bracket positioning and bonding in the present embodiment;
FIG. 2 is a table showing the recommended bracket height positioning in the present embodiment;
FIG. 3 is a diagram of a standard positioning bonding digital model of a bracket in this embodiment;
FIG. 4 is a schematic diagram showing a comparison of a single bracket in this embodiment.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-4.
The embodiment of the application discloses an evaluation method for bracket positioning and bonding accuracy. Referring to fig. 1, the method for evaluating bracket positioning and bonding accuracy includes the following steps:
s1, preparing a bracket digital model and a tooth digital model;
the bracket digital model is uploaded to a software bracket database by a virtual bracket positioning and bonding software design end, and is directly called from the database when in use; the tooth digital model is scanned by a 3D scanner, and the obtained bracket digital model and the tooth digital model are input into virtual bracket positioning and bonding software after the tooth digital model is completed. The dental digital model is scanned from the actual dental model and the dental digital model is scanned using a 3D scanner. Wherein the tooth model is identical to the patient's tooth form.
S2, a standard positioning and bonding digital model is designed in a computer-aided mode;
and (3) introducing the tooth digital model into the virtual bracket positioning and bonding software, and then repairing the tooth digital model to fill holes in the tooth digital model, overlapping the surface sheets, and forming bubbles in the plaster model.
Determining a reference direction, determining a coordinate system to determine the view direction of the teeth, selecting a reference tooth, determining the front view direction, and simultaneously selecting the nearest middle and the farthest middle of the reference tooth to determine the near-far middle position of the reference tooth.
And dividing dentition, namely separating teeth from gingiva by using a curve dividing instruction, marking tooth position numbers of the teeth, and determining that the tooth position numbers of the teeth are not repeated.
The clinical crown long axis of the tooth is determined, wherein "clinical crown" refers to the crown seen by the naked eye of the replacement and permanent dentition of a healthy gum. Wherein the clinical crown long axis of the tooth is positioned in the middle of the labial (buccal) surface of the crown, from the gingival to the occlusal, the most convex part of the crown.
The bracket positioning methods generally have three types:
FA point method (clinical coronal center method): the clinical crown center refers to the intersection point of the clinical crown long axis and the dental crown horizontal line, is positioned at half of the height of the dental crown, and when in positioning, the center points of the bracket groove and the buccal tube are overlapped with the clinical crown center, the bracket vertical mark line is overlapped with the clinical crown long axis, and the mark point on the bracket wing is positioned at the far middle gingival of the tooth;
height method: and (3) selecting a proper bracket positioning height according to the size of the tooth to determine the center position of the bracket groove, wherein the vertical mark line of the bracket coincides with the long axis of the clinical crown, and the mark point on the bracket wing is positioned on the far middle gingival square of the tooth. For each case, the height value of the clinical crown center of the front teeth is measured first and then compared with the front tooth data of each group. And selecting the group data closest to the measured data for bracket positioning. Marking a clinical crown long axis, determining front tooth positioning heights according to the average length of the front tooth clinical crown, and positioning other tooth heights according to data in a bracket positioning table;
edge ridge flush method: the posterior margin ridge is a stable anatomical landmark that is not affected by the extent of tooth eruption and abrasion, and its arrangement in a plane helps to stabilize the establishment of posterior occlusion. The step of using edge ridge localization: marking a clinical crown long axis, marking a near-far middle edge ridge connecting line of the rear teeth, marking a clinical crown center point of a first molar to determine the position of a first molar bracket, measuring the distance between the position of the first molar bracket and the edge ridge connecting line, marking parallel lines with the same distance as the edge ridge connecting line on other rear teeth, namely bonding the rear teeth bracket, determining the bracket height of the cuspid by using 0.5mm higher cuspid bracket than the first premolart, and then determining the bracket height of the incisors.
The present example chooses to use the height method to perform standard positioning of the brackets of the teeth and sets the bracket height to 5.0mm with reference to the recommended bracket height positioning table in fig. 2.
And after the computer-aided positioning and bonding are finished, combining each bracket digital model with the tooth digital model after the positioning is finished, and combining the bracket and the tooth into a standard positioning and bonding digital model by wrapping.
S3, outputting a standard positioning and bonding digital model;
referring to fig. 3, the virtual bracket positioning and bonding software outputs a standard positioning and bonding digital model as an STL model file, and the outputted standard positioning and bonding digital model should contain reference data such as a groove, a center line and the like of the bracket, so that the comparison operation is convenient.
S4, preparing brackets and teeth;
this embodiment uses a dental site metal bracket that matches the bracket digital model and uses the actual patient's teeth.
S5, actually positioning and bonding the bracket to the teeth;
dental metal bracket bonding is generally divided into direct bracket bonding and indirect bracket bonding, with direct bracket bonding being employed in this embodiment.
The tooth surface is cleaned before the direct bracket is bonded, and the tooth surface is washed and dried. The tooth surface is etched for 30-60s, so that the tooth surface has a microporous structure to enhance the bonding strength, and the tooth surface is washed, dried and isolated from moisture after being etched, and resin adhesive and base solution are prepared. The tooth surface is coated with primer liquid, and the bracket bottom plate is coated with resin adhesive. The bracket is placed at a proper position on the tooth surface, bonding is carried out, and excessive resin overflowed is scraped off. And (3) adjusting the position of the bracket to accurately position, and then performing a light curing process for 20 seconds, thereby completing the bonding process of the bracket and the tooth surface.
S6, scanning and outputting an actual positioning bonding digital model by using a 3D scanner;
general method of scanning using a 3D scanner: the scan starts from the last tooth row, scans the occlusal surface first, up to the front tooth, and then scans to the other side, up to the last tooth. After the occlusal surface scanning is completed, the lingual surface scanning is turned to scan along the lingual surface of the last tooth and forward until the lingual surface of the last tooth is opposite. After lingual scanning is completed, the buccal scanning is turned to scan forward along the buccal side of the last tooth until the buccal side of the last tooth is opposite.
The present embodiment can scan only the reference dentition teeth and the peripheral area.
After the scanning is finished, whether the model is complete and has no flaws or not is checked, whether the bracket is complete and clear is checked, and if necessary, the repair scanning is performed to ensure the scanning effect of the bracket and the teeth.
The derived model is in STL format, namely the actual positioning and bonding digital model.
S7, inputting the standard positioning bonding digital model and the actual positioning bonding digital model into a model comparison software to measure the deviation between the models.
The comparison steps are as follows: and respectively importing the dental standard positioning and bonding digital model and the dental actual positioning and bonding digital model into model comparison software. Introducing a tooth model which does not contain a bracket, and aligning the model to align the actual positioning bonding digital model with the tooth digital model which does not contain the bracket; during alignment, corresponding three points are selected on the actual positioning bonding digital model and the standard positioning bonding model respectively, the sampling rate is selected to be 35%, the maximum repetition number is selected to be 50 times, the maximum average deviation is selected to be 0.1mm for preliminary alignment of the models, and then the best fitting alignment of the models is carried out. For a standard positional adhesive digital model, the tooth surface is consistent with the tooth surface of the tooth model that does not include brackets, thus eliminating the need for alignment operations.
The tooth digital model without bracket is subtracted from the standard positioning bond digital model and the actual positioning bond digital model, respectively, using boolean operations.
For the standard positioning and bonding model of the bracket, the tooth surface of the standard positioning and bonding model is consistent with the tooth surface of the tooth model which does not contain the bracket; for the actual positioning and bonding digital model of the bracket, the tooth surface of the digital model is not completely consistent with the tooth surface of the tooth model which does not contain the bracket, so that model repair is required after Boolean operation, overlapped surface sheets are removed, and shells except the bracket are deleted, so that the accuracy of a comparison result is ensured to the greatest extent.
And measuring the deviation between the actual positioning and bonding digital model of the bracket and the standard positioning and bonding digital model:
for example, using a point deviation measuring tool, a mesial-distal deviation of 0.72mm, a gingival-occlusal deviation of 0.68mm, and a labial (buccal) lingual deviation of 0.11mm were measured between the individual brackets;
measuring the deviation of the inclination angles of the shafts among the single bracket by using an angle measuring tool to obtain the deviation of the inclination angles of the shafts of the bracket bonding of 2.2 degrees, the torque deviation data of 1.7 degrees and the compensation deviation data of 0.5 degrees;
using a 3D comparison tool to measure and obtain a deviation color level diagram, and simultaneously obtaining a minimum deviation of 0.09mm, a maximum deviation of 1.02mm and an average deviation of 0.41mm;
when the tolerance is set to 0.1mm, the percentage within the tolerance is 16.4%.
The mesial-distal, gingival-occlusal, labial (buccal) lingual positions of the bracket are output along with the torque, axises, compensation angles and deviation tone maps, minimum deviations, maximum deviations, average deviations, percentage data within tolerances.
Referring to fig. 4, multi-dimensional evaluation is made on the accuracy of the actual positioning and bonding reference dental bracket according to the comparison data, and objective, accurate and digital evaluation comments and guidance comments of bracket positioning and bonding accuracy are given.
The implementation principle of the method for evaluating the bracket positioning and bonding accuracy of the embodiment of the application is as follows: firstly, manufacturing a standard positioning bonding digital model, scanning a tooth model by using a 3D scanner, then performing bracket bonding in virtual bracket positioning bonding software to obtain a standard for comparison, storing a file into an STL format, then scanning a patient bonded with the bracket to obtain an actual positioning bonding digital model bonded with the tooth by the actual bracket, respectively importing the standard positioning bonding digital model and the actual positioning bonding digital model into model comparison software, comparing the standard positioning bonding digital model and the actual positioning bonding digital model in the model comparison software, comparing an actual bonding error, and further evaluating the bracket bonding effect.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (4)
1. The method for evaluating the accuracy of bracket positioning and bonding is characterized by comprising the following steps of:
s1, preparing a bracket digital model and a tooth digital model;
the bracket digital model is uploaded to a software bracket database by a virtual bracket positioning and bonding software design end, and is directly called from the database when in use; the tooth digital model is scanned by a 3D scanner to be an actual tooth model, and the obtained bracket digital model and the tooth digital model are input into virtual bracket positioning and bonding software after the tooth digital model is completed; the tooth digital model is guided into the virtual bracket positioning and bonding software to carry out repairing operation;
s2, a standard positioning and bonding digital model is designed in a computer-aided mode;
bonding the dental position bracket data model and the tooth data model in virtual bracket positioning bonding software, combining and wrapping each bracket digital model and the tooth digital model which are positioned by the virtual bracket positioning bonding software, and combining the bracket and the tooth into a standard positioning bonding digital model; the standard positioning and bonding digital model comprises characteristic data of a main body, a bottom plate, a groove and a central line of the bracket and data of a near-far middle, gingival tooth occlusal orientation, a labial (buccal) lingual position, torque, axial inclination and a compensation angle of the bracket digital model relative to the tooth digital model;
s3, outputting a standard positioning and bonding digital model;
the virtual bracket positioning and bonding software outputs a model file of a standard positioning and bonding digital model;
s4, preparing brackets and teeth;
selecting a dental metal bracket matched with the bracket digital model, and using the real teeth of the patient;
s5, actually positioning and bonding the bracket to the teeth;
bonding the dental metal bracket to the patient's teeth;
s6, scanning and outputting an actual positioning bonding digital model by using a 3D scanner;
scanning the bonded dental metal bracket on the tooth by using a 3D scanner to obtain an actual positioning bonding digital model, and outputting a model file of the actual positioning bonding digital model;
s7, inputting the standard positioning bonding digital model and the actual positioning bonding digital model into a model comparison software to measure the deviation between the models; and after the standard positioning bonding digital model is compared with the actual positioning bonding digital model, outputting data of the percentage in the middle of the approach and the distance of the bracket, the gingival occlusal direction, the labial (buccal) lingual direction position and the torque, the axial inclination, the compensation angle deviation, the deviation color level diagram, the minimum deviation, the maximum deviation, the average deviation and the tolerance.
2. The method for evaluating the accuracy of bracket positioning and bonding according to claim 1, wherein the method comprises the following steps: standard positioning of brackets is performed in the virtual bracket positioning and bonding software by using an FA point method or a height method or an edge ridge leveling method.
3. The method for evaluating the accuracy of bracket positioning and bonding according to claim 1, wherein the method comprises the following steps: the standard locating bond digital model is aligned with the actual locating bond digital model using a three-point alignment method.
4. The method for evaluating the accuracy of bracket positioning and bonding according to claim 1, wherein the method comprises the following steps: and after the standard positioning bonding digital model is aligned with the actual positioning bonding digital model, respectively subtracting the tooth digital model without the bracket from the standard positioning bonding digital model and the actual positioning bonding digital model by using Boolean operation.
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| CN112451151A (en) * | 2020-12-31 | 2021-03-09 | 四川大学 | Orthodontic inspection and evaluation method utilizing mixed reality technology |
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| US7296996B2 (en) * | 1999-11-30 | 2007-11-20 | Orametrix, Inc. | Virtual bracket placement and evaluation |
| US6648640B2 (en) * | 1999-11-30 | 2003-11-18 | Ora Metrix, Inc. | Interactive orthodontic care system based on intra-oral scanning of teeth |
| US9211166B2 (en) * | 2010-04-30 | 2015-12-15 | Align Technology, Inc. | Individualized orthodontic treatment index |
| US20140067334A1 (en) * | 2012-09-06 | 2014-03-06 | Align Technology Inc. | Method and a system usable in creating a subsequent dental appliance |
| US10687917B2 (en) * | 2017-07-14 | 2020-06-23 | Dental Smartmirror, Inc. | Using immersive photographs to guide placement of orthodontic brackets, and applications thereof |
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| CN112451151A (en) * | 2020-12-31 | 2021-03-09 | 四川大学 | Orthodontic inspection and evaluation method utilizing mixed reality technology |
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