CN110269703B - Method for generating occlusion curve of mandibular tooth model - Google Patents
Method for generating occlusion curve of mandibular tooth model Download PDFInfo
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- CN110269703B CN110269703B CN201910528666.7A CN201910528666A CN110269703B CN 110269703 B CN110269703 B CN 110269703B CN 201910528666 A CN201910528666 A CN 201910528666A CN 110269703 B CN110269703 B CN 110269703B
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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
Abstract
The invention discloses a method for generating an occlusion curve of a mandibular tooth model, which comprises the following steps: a. setting each parameter of the initial curve as an adjustable parameter; b. the Euclidean distance from two key points of the buccal incisal end of each tooth to the curve is used as a loss function; c. and continuously adjusting parameters of the curve according to a gradient descent method to minimize the output value of the loss function, and generating a final occlusion curve according with the tooth arrangement condition. The final occlusion curve generated by the generation method provided by the invention has greatly improved accuracy and provides more accurate reference for tooth arrangement conditions for subsequent tooth correction.
Description
Technical Field
The invention relates to the technical field of orthodontic treatment, in particular to a method for generating a bite curve of a mandibular tooth model.
Background
At present, in the dental correction, in order to obtain the arrangement of teeth, the conventional method is to judge the arrangement of teeth by manually observing and thinking a virtual occlusion curve, and the method has the problem that the accuracy is too low.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for generating an occlusion curve of a mandibular tooth model.
The technical scheme adopted by the invention is as follows:
a method for generating a bite curve of a mandibular tooth model, comprising the steps of:
a. setting each parameter of the initial curve as an adjustable parameter; wherein, the initial curve is any curve or a standard curve suitable for most people;
b. taking Euclidean distances from two key points of the buccal resection end of each tooth to the initial curve as a loss function;
c. the parameters of the curve are continuously adjusted according to a gradient descent method to minimize the output value of the loss function (i.e., the distance from the key point to the curve), and a final occlusion curve conforming to the tooth arrangement condition is generated.
Preferably, in step b, the far-middle point and the near-middle point of each tooth buccal-side incisal margin are taken as key points of each tooth. The key points are determined by direct calculation or directly visually marked by medical definition.
Preferably, in step c, the method further comprises the following steps:
judging whether the average difference value of the output value of the loss function after 10 times of adjustment is less than 0.1, if so, judging that the generated curve conforms to the tooth arrangement condition, and the curve at the moment is the final occlusion curve; if not, continuing to adjust and judging again.
The invention has the beneficial effects that:
the final occlusion curve generated by the generation method provided by the invention has greatly improved accuracy and provides more accurate reference for tooth arrangement conditions for subsequent tooth correction.
Drawings
FIG. 1 is a schematic top view of two key points and an initial curve of the buccal end of the tooth in step b of the present invention, wherein the black square points are proximal key points and the black circular points are distal key points;
fig. 2 is a schematic perspective view of two key points and an initial curve of the buccal-lateral incisal end of the tooth in step b of the present invention, wherein the square black point in the figure is the mesial key point, and the circular black point is the distal key point.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
A method for generating a bite curve of a mandibular tooth model, comprising the steps of:
a method for generating a bite curve of a mandibular tooth model, comprising the steps of:
a. setting each parameter of the initial curve as an adjustable parameter; wherein, the initial curve is any curve or a standard curve suitable for most people;
b. as shown in fig. 1 and 2, the Euclidean distance from two key points of the buccal resection end of each tooth to the initial curve is taken as a loss function;
c. the parameters of the curve are continuously adjusted according to a gradient descent method to minimize the output value of the loss function (i.e., the distance from the key point to the curve), and a final occlusion curve conforming to the tooth arrangement condition is generated.
In one embodiment, in step b, the distal and proximal points of the buccal margin of each tooth are used as the key points of each tooth. The key points are determined by direct calculation or directly visually marked by medical definition.
In another embodiment, specifically, in step c, the following steps are further included:
judging whether the average difference value of the output value of the loss function after 10 times of adjustment is less than 0.1, if so, judging that the generated curve conforms to the tooth arrangement condition, and the curve at the moment is the final occlusion curve; if not, continuing to adjust and judging again.
After 10 times of calculation and adjustment, if the average difference value is less than 0.1, the accuracy can meet the actual requirement, the generated curve can meet the tooth arrangement condition, and compared with the traditional occlusion curve which is artificially observed and virtually imagined, the occlusion curve generated by the method is quicker and more accurate.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the 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.
Claims (2)
1. A method for generating a bite curve of a mandibular tooth model, comprising the steps of:
a. setting each parameter of the initial curve as an adjustable parameter;
b. the far midpoint and the near midpoint of the buccal incisal margin of each tooth are taken as key points of each tooth, and the Euclidean distance from two key points of the buccal incisal end of each tooth to the curve is taken as a loss function;
c. and continuously adjusting parameters of the curve according to a gradient descent method to minimize the output value of the loss function, and generating a final occlusion curve according with the tooth arrangement condition.
2. The method for generating a bite curve of a mandibular tooth model according to claim 1, further comprising, in step c, the steps of:
judging whether the average difference value of the output value of the loss function after 10 times of adjustment is less than 0.1, if so, judging that the generated curve conforms to the tooth arrangement condition, and the curve at the moment is the final occlusion curve; if not, continuing to adjust and judging again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910528666.7A CN110269703B (en) | 2019-06-18 | 2019-06-18 | Method for generating occlusion curve of mandibular tooth model |
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| CN201910528666.7A CN110269703B (en) | 2019-06-18 | 2019-06-18 | Method for generating occlusion curve of mandibular tooth model |
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| CN110269703A CN110269703A (en) | 2019-09-24 |
| CN110269703B true CN110269703B (en) | 2021-02-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100553587C (en) * | 2007-07-31 | 2009-10-28 | 南京航空航天大学 | On the three-dimensional grid dentognathic model, accurately survey the method for arch wire fast |
| US9129363B2 (en) * | 2011-07-21 | 2015-09-08 | Carestream Health, Inc. | Method for teeth segmentation and alignment detection in CBCT volume |
| CN103700103A (en) * | 2013-12-05 | 2014-04-02 | 嘉兴学院 | Method for automatically extracting gingiva curves of three-dimensional digital dentition model |
| CN105389444B (en) * | 2015-12-14 | 2018-06-29 | 嘉兴学院 | A kind of gum edge curve design method of personalization tooth-implanting |
| WO2017172537A1 (en) * | 2016-03-28 | 2017-10-05 | Align Technology, Inc. | Systems, methods, and devices for predictable orthodontic treatment |
| KR20190087593A (en) * | 2016-11-30 | 2019-07-24 | 케어스트림 덴탈 테크놀로지 톱코 리미티드 | Method and system for brace removal from a dental mesh |
| CN106779073B (en) * | 2016-12-27 | 2019-05-31 | 西安石油大学 | Media information classification method and device based on deep neural network |
| US11534974B2 (en) * | 2017-11-17 | 2022-12-27 | Align Technology, Inc. | Customized fabrication of orthodontic retainers based on patient anatomy |
| CN108764048B (en) * | 2018-04-28 | 2021-03-16 | 中国科学院自动化研究所 | Face key point detection method and device |
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