Evaluation method and system for enforcement necessity of orthognathic surgery

Abstract

The invention discloses a method and system for evaluating necessity of orthognathic surgery implementation, and belongs to the technical field of medical orthodontic prediction.The method comprises the steps that firstly, head shadow measurement data of a patient is obtained, and the influence degree of a maxillofacial structure on the patient is quantitatively analyzed to obtain a primary score; thirdly, selecting a weight coefficient of the secondary evaluation index from a pre-constructed weight coefficient database according to the primary score; and finally, in combination with the patient data and the weight coefficient corresponding to the second-level evaluation index, calculating to obtain a score of the enforcement necessity of the orthognathic surgery of the patient. The method provides a systematic and quantitative evaluation means, and is used for scientifically judging the necessity of orthognathic surgery.

Description

Technical Field

[0001] The present invention relates to the field of medical correction prediction technology, and more specifically to a method and system for evaluating the necessity of orthognathic surgery. Background Art

[0002] Orthognathic surgery is a procedure that aims to correct maxillofacial bone deformities, restore oral function, and improve facial aesthetics. With the continuous advancement of medical technology, orthognathic surgery is increasingly used in the field of oral and maxillofacial surgery. However, the implementation of the surgery requires strict control of the indications to ensure the safety and effectiveness of the surgery. Therefore, how to scientifically and objectively evaluate the necessity of orthognathic surgery has become an urgent problem to be solved.

[0003] At present, the method of evaluating the necessity of orthognathic surgery mainly relies on the doctor's clinical experience and professional knowledge. Doctors usually make a comprehensive judgment based on the patient's maxillofacial deformity, dental occlusion, oral health, age, psychological state and other factors. In addition, some advanced medical imaging technologies, such as computed tomography (CT) and three-dimensional reconstruction technology, also provide doctors with more accurate maxillofacial structure information, which helps doctors develop personalized surgical plans.

[0004] However, the existing evaluation methods still have some shortcomings. First, although the doctor's clinical experience and professional knowledge are important, they are highly subjective and it is difficult to guarantee the objectivity and accuracy of the evaluation results. Secondly, although medical imaging technology can provide accurate maxillofacial structure information, it lacks a unified and quantitative evaluation standard, which makes it difficult for doctors to judge the necessity of surgery.

[0005] Therefore, how to provide a more scientific and objective evaluation method and system for the necessity of orthognathic surgery is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0006] In view of this, the present invention provides a method and system for evaluating the necessity of orthognathic surgery. By obtaining the patient's cephalometric data, quantitatively analyzing the impact of the maxillofacial structure on the patient, and combining a pre-constructed weight coefficient database including self-assessment, external force, physical condition and other factors, as well as a network relationship model between indicators, the necessity of the patient to undergo orthognathic surgery is comprehensively and objectively evaluated, providing a scientific basis for doctors to formulate treatment plans, while enhancing patients' understanding and acceptance of surgical decisions.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] In one aspect, the present invention provides a method for evaluating the necessity of orthognathic surgery, comprising:

[0009] Acquiring cephalometric data of the patient, analyzing the influence of maxillofacial structure on the patient according to the cephalometric data, and quantifying the influence to obtain a primary score;

[0010] Selecting a weight coefficient of a secondary evaluation indicator from a pre-constructed weight coefficient database according to the primary score;

[0011] The corresponding patient data is obtained according to the secondary evaluation index, and the score of the necessity of orthognathic surgery for the patient is calculated in combination with the weight coefficient corresponding to the secondary evaluation index.

[0012] Preferably, obtaining cephalometric data of the patient, and analyzing the influence of maxillofacial structure on the patient according to the cephalometric data, comprises:

[0013] Obtaining a lateral X-ray film of the patient;

[0014] Setting anatomical landmarks of craniofacial bones and teeth on the X-ray lateral film, and constructing the eye-ear plane Por-Or, the anterior skull base plane SN, the palate plane ANS-PNS and the occlusal plane OP according to the anatomical landmarks;

[0015] Constructing auxiliary measurement landmarks according to the anatomical landmarks and auxiliary lines, and constructing the mandibular plane Go-Me;

[0016] The eye-ear plane Por-Or is set as the reference plane, and the projection length of the anterior skull base plane SN on the eye-ear plane Por-Or is set to a fixed value to perform standardized correction on the size of the craniofacial structure;

[0017] Constructing the maxillary region and the mandibular region of the occlusal space according to the landmark points and the measurement plane, and establishing coordinate systems for the maxillary region and the mandibular region respectively;

[0018] Determining the cephalometric data of the patient according to the coordinate system, the cephalometric data including the inclination, eruption height and sagittal position corresponding to the maxillary anterior teeth, maxillary molars, mandibular anterior teeth and mandibular molars, and describing the length and relative position relationship of the upper and lower jaw areas in the occlusal space;

[0019] The degree of influence of the maxillofacial structure on the patient is determined based on the corresponding inclinations, eruption heights and sagittal positions of the maxillary anterior teeth, maxillary molars, mandibular anterior teeth and mandibular molars, and the lengths and relative positional relationships of the upper and lower jaw areas in the occlusal space.

[0020] Preferably, the weight coefficient database construction method includes:

[0021] Using the statistical analysis description method, the statistical distribution function P corresponding to each influencing indicator in the optimal indicator set is fitted. i(x);

[0022] Combined with the statistical distribution function P i (x) Calculate the cumulative probability distribution function of impact indicator i, and calculate the threshold interval corresponding to impact indicator i according to the threshold percentage interval set for impact indicator i, and combine with the corresponding assignment function to objectively calculate the percentage score of each impact indicator;

[0023] Obtain the secondary evaluation data of patients with different primary scores, combine the percentage score data of each influencing indicator, use the evaluation method to evaluate the necessity of surgery for patients with multiple different primary scores, and calculate the weighted assignment result of each influencing indicator obtained by each patient, and construct the horizontal and vertical information matrix [U, V] of the necessity of surgery for all patients;

[0024] Based on the horizontal and vertical information matrix [U, V] of the indicators, the horizontal and vertical difference matrix [C H ,C Z ];

[0025] According to the horizontal and vertical difference matrix results between the influencing indicators and the difference-driven evaluation principle, the weights of the necessity evaluation of surgery for each patient on each influencing indicator are re-weighted to obtain the weight value w of each patient on each influencing indicator. fi , the weight value w of each patient on each influencing indicator fi Composition weight coefficient database.

[0026] Preferably, the weight coefficients of the secondary evaluation indicators are selected from a pre-constructed weight coefficient database according to the primary score, specifically including:

[0027] Acquire secondary evaluation data of patients under different primary scores, and construct a weight coefficient database corresponding to secondary evaluation indicators under different primary scores based on the secondary evaluation data;

[0028] Searching the weight coefficient database according to the primary score, and returning the query result corresponding to the primary score;

[0029] After deduplication of the query results, the weight coefficients of the secondary evaluation indicators are obtained.

[0030] Preferably, the influencing indicators include: self-assessment indicators, external force indicators, and physical condition indicators.

[0031] Preferably, obtaining corresponding patient data according to the secondary evaluation index, and calculating the score of necessity of orthognathic surgery for the patient in combination with the weight coefficient corresponding to the secondary evaluation index, comprises:

[0032] Construct an indicator network model, in which nodes represent secondary evaluation indicators and edges represent the relationship between secondary evaluation indicators;

[0033] Based on the patient data, weight coefficients and indicator network model, an evaluation algorithm is used to score the necessity of surgery for the patient.

[0034] On the other hand, the present invention provides a system for evaluating the necessity of orthognathic surgery, which is used to implement the above-mentioned method for evaluating the necessity of orthognathic surgery, comprising:

[0035] A primary scoring module is used to obtain the patient's cephalometric data, analyze the influence of the maxillofacial structure on the patient according to the cephalometric data, and quantify the influence to obtain a primary score;

[0036] A weight coefficient selection module is used to select the weight coefficient of the secondary evaluation indicator from a pre-built weight coefficient database according to the primary score;

[0037] The scoring module is used to obtain the corresponding patient data according to the secondary evaluation indicators, and calculate the score of the necessity of orthognathic surgery for the patient in combination with the weight coefficient corresponding to the secondary evaluation indicators.

[0038] Preferably, the primary scoring module includes:

[0039] An image acquisition unit, used for acquiring a lateral X-ray film of the patient;

[0040] A landmark selection unit, used for setting anatomical landmarks of craniofacial bones and teeth on the X-ray lateral film;

[0041] A plane construction module is used to construct the eye-ear plane Por-Or, the anterior skull base plane SN, the palate plane ANS-PNS and the occlusal plane OP according to the anatomical landmarks; construct auxiliary measurement landmarks according to the anatomical landmarks and auxiliary lines, and construct the mandibular plane Go-Me;

[0042] A correction unit is used to set the eye-ear plane Por-Or as a reference plane, and to set the projection length of the anterior skull base plane SN on the eye-ear plane Por-Or to a fixed value, so as to perform standardized correction on the size of the craniofacial structure;

[0043] A coordinate system generating unit, used for constructing the maxillary region and the mandibular region of the occlusal space according to the landmark points and the measuring plane, and establishing coordinate systems for the maxillary region and the mandibular region respectively;

[0044] A data measurement unit, for determining the inclination, eruption height and sagittal position corresponding to the maxillary anterior teeth, maxillary molars, mandibular anterior teeth and mandibular molars according to the coordinate system, and describing the length and relative position relationship of the upper and lower jaw areas in the occlusal space;

[0045] An analysis unit, for determining the degree of influence of the maxillofacial structure on the patient according to the inclination, eruption height and sagittal position corresponding to the maxillary anterior teeth, maxillary molars, mandibular anterior teeth and mandibular molars, and the length and relative position relationship of the upper and lower jaw areas of the occlusal space;

[0046] The quantification unit is used to quantify the impact degree to obtain a primary score.

[0047] Preferably, the weight coefficient selection module includes:

[0048] A database construction unit, used to construct and store weight coefficients corresponding to secondary evaluation indicators under different primary scores, and to construct a weight coefficient database;

[0049] A search unit, configured to retrieve the weight coefficient of the corresponding secondary evaluation indicator from the weight coefficient database according to the primary score, and return the query result;

[0050] The screening unit is used to remove duplicates from the query results to obtain weight coefficients of the secondary evaluation indicators.

[0051] Preferably, the scoring module includes:

[0052] An indicator network model unit is used to construct an indicator network model. In the indicator network model, nodes represent secondary evaluation indicators, and edges represent the relationship between secondary evaluation indicators.

[0053] The evaluation unit is used to score the necessity of surgery for the patient using an evaluation algorithm based on the patient data, weight coefficients and indicator network model.

[0054] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a method and system for evaluating the necessity of orthognathic surgery, which obtains the patient's cephalometric data, analyzes the degree of influence of the maxillofacial structure on the patient, and combines the secondary evaluation indicators and their weight coefficients in the pre-constructed weight coefficient database to comprehensively evaluate the necessity of orthognathic surgery for the patient. The evaluation method provided by the present invention comprehensively considers the patient's maxillofacial structure characteristics, self-assessment, external factors (such as social, psychological, etc.), physical condition and other factors in a scientific and objective manner to provide a quantitative basis for whether the patient needs to undergo orthognathic surgery. By constructing a weight coefficient database and an indicator network model, this method can more accurately evaluate the necessity of the operation, thereby helping doctors make more reasonable treatment decisions, and also helps patients better understand the necessity of the operation and the changes that may be caused. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0056] Figure 1 A flow chart of the method provided by the present invention;

[0057] Figure 2 This is a system framework diagram provided by the present invention. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The embodiment of the present invention discloses a method for evaluating the necessity of performing orthognathic surgery. Figure 1 As shown, including:

[0060] The patient's cephalometric data were obtained, and the influence of maxillofacial structure on the patient was analyzed based on the cephalometric data. The influence was quantified to obtain a primary score.

[0061] Advanced medical imaging techniques (such as X-rays, CT scans or three-dimensional stereo photography) are used to obtain accurate cephalometric data of patients. These data cover multiple dimensions and angles of the craniofacial skeleton, including but not limited to the position, shape, length and relative relationship between the upper and lower jaws. Subsequently, professional cephalometric analysis software is used to conduct in-depth analysis of these data to clarify the characteristics of the patient's maxillofacial structure and its potential impact on oral function (such as chewing, breathing, pronunciation) and facial aesthetics. Based on this analysis, these impacts are quantified to obtain a primary score that reflects the comprehensive impact of maxillofacial structure on the patient. The primary score is used to determine the weight coefficient of the secondary evaluation index. For patients whose maxillofacial structure has a smaller impact on oral function, the weight coefficient of patient factors and the impact of maxillofacial deformity on appearance and function is increased. For patients whose maxillofacial structure has a greater impact on oral function, the weight coefficient of the impact of maxillofacial deformity on appearance and function is reduced, and the weight coefficient of bone tissue index and soft tissue index is increased.

[0062] The weight coefficients of the secondary evaluation indicators are selected from a pre-constructed weight coefficient database based on the primary scores.

[0063] The evaluation process is further refined based on a pre-built weight coefficient database. This database is built based on a large number of clinical studies and expert experience. It contains multiple secondary evaluation indicators (such as patient factors, the impact of maxillofacial deformities on appearance and function, bone tissue indicators and soft tissue indicators, physical factors, etc.) and their corresponding weight coefficients. These weight coefficients reflect the importance of different evaluation indicators in orthognathic surgery decisions. Based on the patient's primary score, we search for a matching set of weight coefficients in the database to ensure the accuracy and pertinence of the evaluation.

[0064] The corresponding patient data is obtained according to the secondary evaluation indicators, and the score of the necessity of orthognathic surgery for the patient is calculated by combining the weight coefficient corresponding to the secondary evaluation indicators.

[0065] In this embodiment, the patient data used for the secondary evaluation is obtained by questionnaire survey and instrument detection. The patient factors and the impact of maxillofacial deformities on appearance and function are obtained by patients' self-scoring. The questionnaire scoring content is shown in Table 1. The bone tissue index and soft tissue index scores are automatically generated by professional measuring equipment, and the scoring criteria are shown in Table 2.

[0066] Table 1 Questionnaire form

[0067]

[0068]

[0069]

[0070] Table 2 Scoring criteria for bone tissue and cartilage tissue

[0071]

[0072]

[0073]

[0074]

[0075] Furthermore, the patient's cephalometric data is obtained, and the degree of influence of the maxillofacial structure on the patient is analyzed based on the cephalometric data, including:

[0076] Obtain a lateral X-ray of the patient;

[0077] The anatomical landmarks of the craniofacial skeleton and teeth were set on the lateral X-ray film, and the oculo-auricular plane Por-Or, anterior skull base plane SN, palatal plane ANS-PNS and occlusal plane OP were constructed based on the anatomical landmarks.

[0078] Specifically, the craniofacial region is composed of multiple bones, which are divided into three basic regions: the skull base, maxilla, and mandible based on the anatomical structure, developmental characteristics, and feasibility of clinical treatment. These regions together constitute the basic structure of the face, support the teeth and soft tissues, are the cornerstone of the normal functioning of the chewing function, and play a decisive role in the facial contour and beauty. Therefore, they occupy a core position in the aesthetic and functional reconstruction of the maxillofacial region. During the growth and development process, the size, shape, and relative position of the various skeletal components of the craniofacial region continue to change. Before birth, the development of the cranium and brain has reached 60%, while the development of the face has only reached 30%. After birth, the skull matures first, and about 90% of the development is completed at about 6 years old. After that, the changes in the anterior skull base are minimal; in contrast, the development of the upper and lower jaws continues from birth to adulthood, among which the maxilla develops earlier than the mandible, and the mandible has a longer total growth period and a larger growth amount. Therefore, this trend of gradually extending the growth period and increasing the growth amount from top to bottom requires us to set a stable reference system at the skull base when analyzing and evaluating craniofacial morphology. Commonly used reference planes include the Frankfurt plane (i.e., the eye-ear plane) and the anterior skull base plane SN. Although the eye-ear plane has small differences between individuals, its fixed-point accuracy is easily affected by the quality of the X-ray film, resulting in increased errors in longitudinal comparisons; and although the SN plane has good repeatability, its inclination varies greatly between individuals, which is not conducive to cross-individual comparisons. In order to reveal the morphological differences of different bone facial types and provide guidance for clinical diagnosis and analysis, we can select the eye-ear plane and its perpendicular line as reference planes in the horizontal and vertical directions, respectively.

[0079] Auxiliary measurement landmarks were constructed based on anatomical landmarks and auxiliary lines, and the mandibular plane Go-Me was constructed; the landmarks included: ear point (Por), nasal root point (N), sella turcica point (S), skull base point (Ba), orbital point (Or), nasofrontal point, glabella, frontal tubercle, pterion, coronal sagittal point (frontal vertex, anterior fontanelle), external occipital protuberance, superior nuchal line, anterior nasal spine point (ANS), posterior nasal spine point (PNS), upper central incisor incisal edge point (Ui), and lower central incisor incisal edge point (Li).

[0080] The eye-ear plane Por-Or is set as the reference plane, and the projection length of the anterior skull base plane SN on the eye-ear plane Por-Or is set to a fixed value to perform standardized correction on the size of the craniofacial structure;

[0081] The maxillary and mandibular regions of the occlusal space are constructed according to the landmarks and the measurement plane, and coordinate systems are established for the maxillary and mandibular regions respectively;

[0082] Determine the cephalometric data of the patient according to the coordinate system, the cephalometric data including the inclination, eruption height and sagittal position corresponding to the maxillary anterior teeth, maxillary molars, mandibular anterior teeth and mandibular molars, and describe the length and relative position relationship of the upper and lower jaw areas in the occlusal space;

[0083] The degree of influence of maxillofacial structure on the patient is determined based on the corresponding inclination, eruption height and sagittal position of the maxillary anterior teeth, maxillary molars, mandibular anterior teeth and mandibular molars, and the length and relative position relationship of the upper and lower jaw areas in the occlusal space.

[0084] Furthermore, the weight coefficient database construction method includes:

[0085] Comprehensively collect influencing indicators that affect the implementation of orthognathic surgery, and construct a basic indicator set for evaluating the necessity of orthognathic surgery. This step requires extensive collection of information from clinical cases, medical literature, expert opinions, etc. to ensure the comprehensiveness and scientificity of the indicator set. Influencing indicators may include but are not limited to the patient's age, gender, degree of facial deformity, degree of occlusal abnormality, respiratory function, psychological state, past medical history, surgical risks and expected effects.

[0086] The agglomerative hierarchical clustering method based on the sum of squared deviations is used to optimize and streamline the influencing indicators in the basic indicator set, eliminate redundant indicators, and construct the optimal indicator set; by calculating the sum of squared deviations between indicators, the similarities and differences between them are measured, so as to gradually merge indicators with high similarity and eliminate redundant indicators, and finally construct an optimal indicator set that is both streamlined and effective, thereby improving the efficiency and accuracy of the evaluation system.

[0087] Using the statistical analysis description method, the statistical distribution function P corresponding to each influencing indicator in the optimal indicator set is fitted. i (x);

[0088] Combined with the statistical distribution function P i (x) Calculate the cumulative probability distribution function of impact indicator i, and calculate the threshold interval corresponding to impact indicator i according to the threshold percentage interval set for impact indicator i, and combine with the corresponding assignment function to objectively calculate the percentage score of each impact indicator;

[0089] Obtain the secondary evaluation data of patients with different primary scores, combine the percentage score data of each influencing indicator, use the evaluation method to evaluate the necessity of surgery for patients with multiple different primary scores, and calculate the weighted assignment result of each influencing indicator obtained by each patient, and construct the horizontal and vertical information matrix [U, V] of the necessity of surgery for all patients;

[0090] Based on the horizontal and vertical information matrix [U, V] of the indicators, the horizontal and vertical difference matrix [C H ,C Z ];

[0091] According to the horizontal and vertical difference matrix results between the influencing indicators and the difference-driven evaluation principle, the weights of the necessity evaluation of surgery for each patient on each influencing indicator are re-weighted to obtain the weight value w of each patient on each influencing indicator. fi , the weight value w of each patient on each influencing indicator fi Composition weight coefficient database.

[0092] In another embodiment, the weight coefficients of the secondary evaluation indicators are selected from a pre-constructed weight coefficient database according to the primary score, specifically including:

[0093] Obtain secondary evaluation data of patients under different primary scores, and construct a weight coefficient database corresponding to secondary evaluation indicators under different primary scores based on the secondary evaluation data;

[0094] Query the weight coefficient database according to the primary score, and return the query result corresponding to the primary score;

[0095] After removing duplicate query results, the weight coefficients of the secondary evaluation indicators are obtained.

[0096] Furthermore, the influencing indicators include: self-assessment indicators, external force indicators, and physical condition indicators.

[0097] In another embodiment, the corresponding patient data is obtained according to the secondary evaluation index, and the score of the necessity of orthognathic surgery for the patient is calculated in combination with the weight coefficient corresponding to the secondary evaluation index, including:

[0098] Construct an indicator network model. In the evaluation network model, nodes represent secondary evaluation indicators, and edges represent the relationship between secondary evaluation indicators.

[0099] Based on patient data, weight coefficients and indicator network model, an evaluation algorithm is used to score the necessity of surgery for patients.

[0100] On the other hand, the present invention provides a system for evaluating the necessity of orthognathic surgery, which is used to implement the above-mentioned method for evaluating the necessity of orthognathic surgery. Figure 2 As shown, including:

[0101] The primary scoring module is used to obtain the patient's cephalometric data, analyze the impact of the maxillofacial structure on the patient based on the cephalometric data, and quantify the impact to obtain a primary score;

[0102] A weight coefficient selection module is used to select the weight coefficient of the secondary evaluation indicator from a pre-built weight coefficient database according to the primary score;

[0103] The scoring module is used to obtain the corresponding patient data according to the secondary evaluation indicators, and calculate the score of the necessity of orthognathic surgery for the patient in combination with the weight coefficient corresponding to the secondary evaluation indicators.

[0104] Furthermore, the primary scoring module includes:

[0105] An image acquisition unit, used for obtaining a lateral X-ray film of a patient;

[0106] A landmark selection unit is used to set anatomical landmarks of craniofacial bones and teeth on the lateral X-ray film;

[0107] The plane construction module is used to construct the eye-ear plane Por-Or, the anterior skull base plane SN, the palate plane ANS-PNS and the occlusal plane OP according to the anatomical landmarks; construct auxiliary measurement landmarks according to the anatomical landmarks and auxiliary lines, and construct the mandibular plane Go-Me;

[0108] A correction unit is used to set the eye-ear plane Por-Or as a reference plane, and to set the projection length of the anterior skull base plane SN on the eye-ear plane Por-Or to a fixed value, so as to perform standardized correction on the size of the craniofacial structure;

[0109] A coordinate system generating unit, used for constructing the maxillary region and the mandibular region of the occlusal space according to the landmarks and the measuring plane, and establishing coordinate systems for the maxillary region and the mandibular region respectively;

[0110] A data measurement unit, used to determine the inclination, eruption height and sagittal position corresponding to the maxillary anterior teeth, maxillary molars, mandibular anterior teeth and mandibular molars according to the coordinate system, and to describe the length and relative position relationship of the upper and lower jaw areas in the occlusal space;

[0111] An analysis unit, for determining the degree of influence of the maxillofacial structure on the patient according to the corresponding inclinations, eruption heights and sagittal positions of the maxillary anterior teeth, maxillary molars, mandibular anterior teeth and mandibular molars, and the lengths and relative positional relationships of the upper and lower jaw regions of the occlusal space;

[0112] The quantitative unit is used to quantify the degree of impact to obtain a primary score.

[0113] Furthermore, the weight coefficient selection module includes:

[0114] A database construction unit, used to construct and store weight coefficients corresponding to secondary evaluation indicators under different primary scores, and to construct a weight coefficient database;

[0115] A search unit is used to retrieve the weight coefficient of the corresponding secondary evaluation indicator from the weight coefficient database according to the primary score, and return the query result;

[0116] The screening unit is used to remove duplicates from the query results and obtain the weight coefficients of the secondary evaluation indicators.

[0117] Furthermore, the scoring module includes:

[0118] An indicator network model unit is used to construct an indicator network model. In the indicator network model, nodes represent secondary evaluation indicators, and edges represent the relationship between secondary evaluation indicators.

[0119] The evaluation unit is used to score the necessity of surgery for patients using an evaluation algorithm based on patient data, weight coefficients and an indicator network model.

[0120] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0121] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for evaluating the necessity of orthognathic surgery, characterized in that: include: Acquiring cephalometric data of the patient, analyzing the influence of maxillofacial structure on the patient according to the cephalometric data, and quantifying the influence to obtain a primary score; Selecting a weight coefficient of a secondary evaluation indicator from a pre-constructed weight coefficient database according to the primary score; The corresponding patient data is obtained according to the secondary evaluation index, and the score of the necessity of orthognathic surgery for the patient is calculated in combination with the weight coefficient corresponding to the secondary evaluation index.

2. The method for evaluating the necessity of orthognathic surgery according to claim 1, characterized in that: Acquiring cephalometric data of the patient, and analyzing the influence of maxillofacial structure on the patient according to the cephalometric data, including: Obtaining a lateral X-ray film of the patient; Setting anatomical landmarks of craniofacial bones and teeth on the X-ray lateral film, and constructing the eye-ear plane Por-Or, the anterior skull base plane SN, the palate plane ANS-PNS and the occlusal plane OP according to the anatomical landmarks; Constructing auxiliary measurement landmarks according to the anatomical landmarks and auxiliary lines, and constructing the mandibular plane Go-Me; The eye-ear plane Por-Or is set as the reference plane, and the projection length of the anterior skull base plane SN on the eye-ear plane Por-Or is set to a fixed value to perform standardized correction on the size of the craniofacial structure; Constructing the maxillary region and the mandibular region of the occlusal space according to the landmark points and the measurement plane, and establishing coordinate systems for the maxillary region and the mandibular region respectively; Determining the cephalometric data of the patient according to the coordinate system, the cephalometric data including the inclination, eruption height and sagittal position corresponding to the maxillary anterior teeth, maxillary molars, mandibular anterior teeth and mandibular molars, and describing the length and relative position relationship of the upper and lower jaw areas in the occlusal space; The degree of influence of the maxillofacial structure on the patient is determined based on the corresponding inclinations, eruption heights and sagittal positions of the maxillary anterior teeth, maxillary molars, mandibular anterior teeth and mandibular molars, and the lengths and relative positional relationships of the upper and lower jaw areas in the occlusal space.

3. The method for evaluating the necessity of orthognathic surgery according to claim 1, characterized in that: The weight coefficient database construction method comprises: Collect all the influencing indicators that affect the implementation of orthognathic surgery and construct a basic indicator set for evaluating the necessity of orthognathic surgery implementation; The agglomerative hierarchical clustering method based on the sum of squared deviations is used to optimize and simplify the influencing indicators in the basic indicator set, eliminate redundant indicators, and construct the optimal indicator set; Using the statistical analysis description method, the statistical distribution function P corresponding to each influencing indicator in the optimal indicator set is fitted. i (x); Combined with the statistical distribution function P i (x) Calculate the cumulative probability distribution function of impact indicator i, and calculate the threshold interval corresponding to impact indicator i according to the threshold percentage interval set for impact indicator i, and combine with the corresponding assignment function to objectively calculate the percentage score of each impact indicator; Obtain the secondary evaluation data of patients with different primary scores, combine the percentage score data of each influencing indicator, use the evaluation method to evaluate the necessity of surgery for patients with multiple different primary scores, and calculate the weighted assignment result of each influencing indicator obtained by each patient, and construct the horizontal and vertical information matrix [U, V] of the necessity of surgery for all patients; Based on the horizontal and vertical information matrix [U, V] of the indicators, the horizontal and vertical difference matrix [C H ,C Z ]; According to the horizontal and vertical difference matrix results between the influencing indicators and the difference-driven evaluation principle, the weights of the necessity evaluation of surgery for each patient on each influencing indicator are re-weighted to obtain the weight value w of each patient on each influencing indicator. fi , the weight value w of each patient on each influencing indicator fi Composition weight coefficient database.

4. The method for evaluating the necessity of orthognathic surgery according to claim 1, characterized in that: The weight coefficients of the secondary evaluation indicators are selected from a pre-constructed weight coefficient database according to the primary score, specifically including: Acquire secondary evaluation data of patients under different primary scores, and construct a weight coefficient database corresponding to secondary evaluation indicators under different primary scores based on the secondary evaluation data; Searching the weight coefficient database according to the primary score, and returning the query result corresponding to the primary score; After deduplication of the query results, the weight coefficients of the secondary evaluation indicators are obtained.

5. The method for evaluating the necessity of orthognathic surgery according to claim 3, characterized in that: The influencing indicators include: self-assessment indicators, external force indicators, and physical condition indicators.

6. The method for evaluating the necessity of orthognathic surgery according to claim 1, characterized in that: Acquiring corresponding patient data according to the secondary evaluation index, and calculating the score of necessity of orthognathic surgery for the patient in combination with the weight coefficient corresponding to the secondary evaluation index, including: Construct an indicator network model, in which nodes represent secondary evaluation indicators and edges represent the relationship between secondary evaluation indicators; Based on the patient data, weight coefficients and indicator network model, an evaluation algorithm is used to score the necessity of surgery for the patient.

7. A system for evaluating the necessity of orthognathic surgery, characterized in that: A method for evaluating the necessity of performing orthognathic surgery as claimed in any one of claims 1 to 6, comprising: A primary scoring module is used to obtain the patient's cephalometric data, analyze the influence of the maxillofacial structure on the patient according to the cephalometric data, and quantify the influence to obtain a primary score; A weight coefficient selection module is used to select the weight coefficient of the secondary evaluation indicator from a pre-built weight coefficient database according to the primary score; The scoring module is used to obtain the corresponding patient data according to the secondary evaluation indicators, and calculate the score of the necessity of orthognathic surgery for the patient in combination with the weight coefficient corresponding to the secondary evaluation indicators.

8. The system for evaluating the necessity of orthognathic surgery according to claim 7, characterized in that: The primary scoring module includes: An image acquisition unit, used for acquiring a lateral X-ray film of the patient; A landmark selection unit, used for setting anatomical landmarks of craniofacial bones and teeth on the X-ray lateral film; A plane construction module is used to construct the eye-ear plane Por-Or, the anterior skull base plane SN, the palate plane ANS-PNS and the occlusal plane OP according to the anatomical landmarks; construct auxiliary measurement landmarks according to the anatomical landmarks and auxiliary lines, and construct the mandibular plane Go-Me; A correction unit is used to set the eye-ear plane Por-Or as a reference plane, and to set the projection length of the anterior skull base plane SN on the eye-ear plane Por-Or to a fixed value, so as to perform standardized correction on the size of the craniofacial structure; A coordinate system generating unit, used for constructing the maxillary region and the mandibular region of the occlusal space according to the landmark points and the measuring plane, and establishing coordinate systems for the maxillary region and the mandibular region respectively; A data measurement unit, for determining the inclination, eruption height and sagittal position corresponding to the maxillary anterior teeth, maxillary molars, mandibular anterior teeth and mandibular molars according to the coordinate system, and describing the length and relative position relationship of the upper and lower jaw areas in the occlusal space; An analysis unit, for determining the degree of influence of the maxillofacial structure on the patient according to the inclination, eruption height and sagittal position corresponding to the maxillary anterior teeth, maxillary molars, mandibular anterior teeth and mandibular molars, and the length and relative position relationship of the upper and lower jaw areas of the occlusal space; The quantification unit is used to quantify the impact degree to obtain a primary score.

9. The system for evaluating the necessity of orthognathic surgery according to claim 7, characterized in that: The weight coefficient selection module includes: A database construction unit, used to construct and store weight coefficients corresponding to secondary evaluation indicators under different primary scores, and to construct a weight coefficient database; A search unit, configured to retrieve the weight coefficient of the corresponding secondary evaluation indicator from the weight coefficient database according to the primary score, and return the query result; The screening unit is used to remove duplicates from the query results to obtain weight coefficients of the secondary evaluation indicators.

10. The system for evaluating the necessity of orthognathic surgery according to claim 7, characterized in that: The scoring module includes: An indicator network model unit is used to construct an indicator network model. In the indicator network model, nodes represent secondary evaluation indicators, and edges represent the relationship between secondary evaluation indicators. The evaluation unit is used to score the necessity of surgery for the patient using an evaluation algorithm based on the patient data, weight coefficients and indicator network model.

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