Method for determining maxillofacial cutting path of appliance, cutting method and cutting device
阅读说明：本技术 确定矫治器颌面切割路径的方法、切割方法及切割装置 (Method for determining maxillofacial cutting path of appliance, cutting method and cutting device ) 是由 沈斌杰 姚峻峰 于 2019-09-20 设计创作，主要内容包括：一种确定矫治器颌面切割路径的方法,包括步骤：建立上牙颌模型和下牙颌模型的咬合关系；根据咬合关系确定待去除咬合面,并根据咬合关系获得待去除咬合面所包含的咬合顶点；根据咬合顶点确定待去除咬合面切割边缘的切割路径。通过建立咬合关系确定待去除咬合面及该待去除咬合面所包含的咬合顶点,根据该咬合顶点自动进行切割路径的拟合,自动识别和确定需要切割的轨迹,切割路径精准可控,为后续激光切割提供切割基础；针对于凹面畸形矫治的矫治器制备时,使得切割后的矫治器在与对颌配合时,能够有效的对上下颌之间的相对位置进行固定。针对于助萌的应用时,对需要萌出的牙齿咬合面进行相应的切割,助于萌芽的导出。(A method of determining a maxillofacial incision path for an appliance, comprising the steps of: establishing an occlusion relation between the upper dental model and the lower dental model; determining an occlusal surface to be removed according to the occlusion relation, and obtaining an occlusion peak contained in the occlusal surface to be removed according to the occlusion relation; and determining a cutting path of the cutting edge of the occlusal surface to be removed according to the occlusion peak. Determining an occlusal surface to be removed and an occlusal peak contained in the occlusal surface to be removed by establishing an occlusion relation, automatically fitting a cutting path according to the occlusal peak, automatically identifying and determining a track to be cut, and providing a cutting basis for subsequent laser cutting, wherein the cutting path is accurate and controllable; when preparing the appliance for correcting the concave surface deformity, the cut appliance can be effectively fixed at the relative position between the upper jaw and the lower jaw when being matched with the jaws. When the eruption-assisting device is applied to eruption assistance, the occlusal surface of teeth needing to erupt is correspondingly cut, and the eruption is guided out favorably.)
1. A method of determining a maxillofacial incision path for an appliance, comprising the steps of:
establishing an occlusion relation between the upper dental model and the lower dental model;
determining an occlusal surface to be removed according to the occlusion relation, and obtaining an occlusion peak contained in the occlusal surface to be removed according to the occlusion relation;
and determining a cutting path of the cutting edge of the occlusal surface to be removed according to the occlusion peak.
2. The method of claim 1, wherein the occlusal surface to be removed is determined according to the occlusal relationship, and particularly the occlusal surface to be removed in the dental model is determined according to the occlusal relationship;
and determining a cutting path of the cutting edge of the occlusal surface to be removed according to the occlusion peak, specifically determining the cutting path of the cutting edge of the occlusal surface to be removed in the dental model according to the occlusion peak.
3. The method of determining a maxillofacial incision path of an appliance of claim 1, further comprising the step of obtaining an appliance model based on the occlusal relationship between the upper and lower dental models, wherein the occlusal surface to be removed is determined based on the occlusal relationship, and in particular the occlusal surface to be removed in the appliance model is determined based on the occlusal relationship;
and determining a cutting path of the cutting edge of the occlusal surface to be removed according to the occlusal peak, specifically determining a cutting path of the cutting edge of the occlusal surface to be removed in the appliance model according to the occlusal peak.
4. The method of determining the maxillofacial incision path of an appliance of claim 2, wherein the occlusal apex included in the occlusal surface to be removed is obtained according to the occlusal relationship, and the method comprises the steps of:
establishing a KD tree for the top point on the jaw tooth model;
searching each vertex on the corresponding tooth in the dental model of the occlusal surface to be removed and the nearest vertex on the opposite jaw tooth model based on the KD tree;
calculating the distance between the nearest vertex pair;
and taking the vertex with the distance smaller than the first threshold value as the occlusion vertex.
5. The method of determining the maxillofacial incision path of an appliance of claim 2, wherein the obtaining of the occlusal apex of the occlusal surface to be removed according to the occlusal relationship comprises:
calculating the distance between each vertex on the corresponding tooth model in the dental model of the occlusal surface to be removed and each vertex on the opposite jaw tooth model;
and taking the vertex with the distance smaller than the first threshold value as the occlusion vertex.
6. The method of determining an appliance jaw face cut path of claim 4 or claim 5, wherein the dental model is a digitized triangular patch dental model, and the first threshold range is between a negative value of the triangular patch average side length and a positive value of the triangular patch average side length.
7. The method for determining the maxillofacial cutting path of an appliance according to claim 2, wherein the determining the cutting path of the incisal edge of the occlusal surface to be removed in the dental model according to the occlusal apex comprises the following steps:
setting an initial curve on a tooth model corresponding to the dental model where the occlusal surface to be removed is positioned;
and driving the initial curve to move towards the expected target boundary of the occlusal surface to be removed based on a level set function evolution equation so as to obtain a cutting path of the cutting edge of the occlusal surface to be removed.
8. The method of determining an appliance maxillofacial incision path of claim 7, wherein the level set function-based evolution equation drives the initial curve to move toward a desired target boundary of the occlusal surface to be removed to obtain an incision path of the incisal edge to be removed, comprising:
calculating geodesic distance values of all vertexes on a tooth model corresponding to the occlusal surface to be removed in the dental model, wherein the geodesic distance values of the vertexes on one side of the occlusal vertex and the other side of the occlusal vertex of the current curve are negative values, and the geodesic distance values of the vertexes on the other side of the occlusal vertex and the current curve are positive values;
adopting geodesic curvature flow to obtain a level set function evolution equation, and obtaining the position of a next curve based on the geodesic distance value of the current curve;
judging whether the curvature change of the curve before and after evolution is within a preset range, if not, carrying out iterative evolution until the curve after evolution is moved to the expected target boundary of the occlusal surface to be removed;
the curve position of the desired target boundary moved to the occlusal surface to be removed is represented by a zero level set to obtain a cutting path of the cutting edge of the occlusal surface to be removed.
9. The method of claim 8, wherein the step of obtaining the evolution equation of the level set function using the geodetic curvature flow and obtaining the position of the next curve based on the geodetic distance value of the current curve comprises:
wherein phi (t)n+1) Is the next curve position, phi (t)n) The position of the former curve, delta t is the moving step length, and g is the geodesic distance value of all vertexes from the occlusion vertexes on the tooth model corresponding to the dental model where the occlusal surface to be removed is located.
10. A maxillofacial incision method of an orthopedic appliance is characterized by comprising the following steps:
the method of determining a maxillofacial incision path of an appliance of any one of claims 1 to 9, determining an incision path in the appliance from which an occlusal incision edge is to be removed;
and cutting the occlusal surface to be removed of the appliance according to the cutting path.
11. An appliance maxillofacial incision path determination apparatus, comprising:
the establishing module is used for establishing the occlusion relation between the upper dental model and the lower dental model;
the acquisition module is used for determining an occlusal surface to be removed according to the occlusion relation and acquiring an occlusion peak contained in the occlusal surface to be removed according to the occlusion relation;
and the determining module is used for determining the cutting path of the cutting edge of the occlusal surface to be removed according to the occlusion peak.
12. The determination apparatus according to claim 11, wherein the acquisition module is configured to determine an occlusal surface to be removed in the dental model according to the occlusion relationship;
the determining module is used for determining a cutting path of an occlusal surface cutting edge to be removed in the dental model according to the occlusal vertex.
13. The determination apparatus according to claim 11, wherein the obtaining module is configured to obtain the appliance model according to the occlusion relationship between the upper dental model and the lower dental model, and further configured to determine an occlusal surface to be removed in the appliance model according to the occlusion relationship;
the determining module is used for determining a cutting path of an occlusal surface cutting edge to be removed in the appliance model according to the occlusal peak.
14. An electronic device comprising a processor and a memory, the memory having stored therein at least one instruction, at least one program, a set of codes, or a set of instructions, the at least one instruction, the at least one program, the set of codes, or the set of instructions being loaded and executed by the processor to implement the method of determining an appliance maxillofacial cutting path of any one of claims 1 to 9.
15. An appliance maxillofacial cutting device, comprising:
a incised path determination module for determining a incised path of an occlusal incised edge to be removed in the appliance according to the determination method of an appliance maxillofacial incised path of any one of claims 1 to 9;
and the cutting module is used for cutting the occlusal surface to be removed of the appliance according to the cutting path.
16. An electronic device comprising a processor and a memory, the memory having stored therein at least one instruction, at least one program, a set of codes, or a set of instructions, the at least one instruction, the at least one program, the set of codes, or the set of instructions being loaded and executed by the processor to implement the appliance maxillofacial cutting method of claim 10.
Technical Field
The invention relates to the technical field of medical instruments, in particular to a method for determining a maxillofacial cutting path of a georger appliance, a cutting method and a cutting device.
Background
Malocclusion refers to congenital genetic factors or acquired environmental factors such as diseases, bad habits of the oral cavity, dysdonia of tooth replacement, etc., and may also be caused by trauma and periodontal diseases after growth, such as misalignment of teeth, abnormal occlusion of upper and lower dental arches, abnormal size and position of jaw, facial deformity, etc. The factors and mechanisms of malocclusion are intricate, and the process of occurrence may be effected by a single factor and a single mechanism, or may be the result of multiple factors or multiple mechanisms acting together. The pathogenesis of the malocclusion deformity can be divided into two categories, namely congenital factors and acquired factors, from the time of the formation of the malocclusion deformity, but aiming at the generation mechanism of the individual malocclusion deformity, the pathogenesis of the malocclusion deformity can be divided into internal genetic factors and external environmental factors.
The ware is rescued to stealthy tooth because it wears comfortable taking off and wearing, and pleasing to the eye, be selected by more and more people, wear stealthy tooth when correcting and rescure the ware and need its and tooth closely laminate, the annex of pasting on the cooperation tooth is rescued, and this kind of ware is rescued to stealthy tooth is stronger to the parcel nature of tooth, wear when replacing the tooth phase to teenager, because there is the deletion tooth easily, this deletion part wraps up the gum surface in the preparation process of ware is rescued to stealthy tooth, wear stealthy tooth and rescure the ware and need longer time, be unfavorable for the growth of erupting the tooth. In addition, the upper jaw and the lower jaw are simultaneously corrected, and the upper jaw and the lower jaw are matched to finish correction, because the invisible teeth correction device is made of high polymer materials, relative sliding is easily generated during the matching of the upper jaw and the lower jaw, the establishment of a stable relation between the upper jaw and the lower jaw is not facilitated, and particularly, when the jaw pad is arranged on the upper jaw teeth, the stability of the relative position of the jaw pad and the lower jaw in matching is poor. At present, the method for making the incision on the invisible tooth appliance is to manually cut the opening on the tooth socket according to the cutting requirement, but the method has large human factors, the uncertainty factor of the cutting result caused by the difference of personal making exists, and the cutting track result cannot be effectively controlled.
Therefore, it is of great significance to research a method for automatically determining the cutting track in the invisible tooth correction and automatically cutting holes on the invisible tooth correction device according to the oral cavity condition of a patient.
Disclosure of Invention
The invention solves the technical problem of providing a method for determining a maxillofacial cutting path of an orthopedic appliance, a cutting method and a cutting device, which can automatically identify and determine a track to be cut according to the intraoral condition of a patient, the cutting path is accurate and controllable, and a cutting basis is provided for subsequent laser cutting.
According to a first aspect, there is provided a method of determining a maxillofacial incision path of an appliance, comprising the steps of:
establishing an occlusion relation between the upper dental model and the lower dental model;
determining an occlusal surface to be removed according to the occlusion relation, and obtaining an occlusion peak contained in the occlusal surface to be removed according to the occlusion relation;
and determining a cutting path of the cutting edge of the occlusal surface to be removed according to the occlusion peak.
Further, determining an occlusal surface to be removed according to the occlusion relationship, specifically determining an occlusal surface to be removed in the dental model according to the occlusion relationship;
and determining a cutting path of the cutting edge of the occlusal surface to be removed according to the occlusion peak, specifically determining the cutting path of the cutting edge of the occlusal surface to be removed in the dental model according to the occlusion peak.
Further, the method comprises the step of obtaining an appliance model according to the occlusion relation of an upper dental model and a lower dental model, wherein an occlusal surface to be removed is determined according to the occlusion relation, and specifically, the occlusal surface to be removed in the appliance model is determined according to the occlusion relation;
and determining a cutting path of the cutting edge of the occlusal surface to be removed according to the occlusal peak, specifically determining a cutting path of the cutting edge of the occlusal surface to be removed in the appliance model according to the occlusal peak.
Further, obtaining an occlusion vertex included in the occlusion surface to be removed according to the occlusion relationship, specifically comprising the steps of:
establishing a KD tree for the top point on the jaw tooth model;
searching each vertex on the corresponding tooth in the dental model of the occlusal surface to be removed and the nearest vertex on the opposite jaw tooth model based on the KD tree;
calculating the distance between the nearest vertex pair;
and taking the vertex with the distance smaller than the first threshold value as the occlusion vertex.
Further, the obtaining of the occlusion vertex included in the occlusal surface to be removed according to the occlusion relationship specifically includes the steps of:
calculating the distance between each vertex on the corresponding tooth model in the dental model of the occlusal surface to be removed and each vertex on the opposite jaw tooth model;
and taking the vertex with the distance smaller than the first threshold value as the occlusion vertex.
Further, the dental model is a digital triangular patch dental model, and the first threshold range is between a negative value of the average side length of the triangular patch and a positive value of the average side length of the triangular patch.
Further, the determining the cutting path of the cutting edge of the occlusal surface to be removed in the dental model according to the occlusion peak specifically includes the steps of:
setting an initial curve on a tooth model corresponding to the dental model where the occlusal surface to be removed is positioned;
and driving the initial curve to move towards the expected target boundary of the occlusal surface to be removed based on a level set function evolution equation so as to obtain a cutting path of the cutting edge of the occlusal surface to be removed.
Further, the driving the initial curve to move toward the desired target boundary of the occlusal surface to be removed based on the level set function evolution equation to obtain the cutting path of the cutting edge of the occlusal surface to be removed specifically includes the steps of:
calculating geodesic distance values of all vertexes on a tooth model corresponding to the occlusal surface to be removed in the dental model, wherein the geodesic distance values of the vertexes on one side of the occlusal vertex and the other side of the occlusal vertex of the current curve are negative values, and the geodesic distance values of the vertexes on the other side of the occlusal vertex and the current curve are positive values;
adopting geodesic curvature flow to obtain a level set function evolution equation, and obtaining the position of a next curve based on the geodesic distance value of the current curve;
judging whether the curvature change of the curve before and after evolution is within a preset range, if not, carrying out iterative evolution until the curve after evolution is moved to the expected target boundary of the occlusal surface to be removed;
the curve position of the desired target boundary moved to the occlusal surface to be removed is represented by a zero level set to obtain a cutting path of the cutting edge of the occlusal surface to be removed.
Further, the specific process of obtaining the level set function evolution equation by using the geodesic curvature flow and obtaining the next curve position based on the geodesic distance value of the current curve is as follows:
wherein phi (t)n+1) Is the next curve position, phi (t)n) The position of the former curve, delta t is the moving step length, and g is the geodesic distance value of all vertexes from the occlusion vertexes on the tooth model corresponding to the dental model where the occlusal surface to be removed is located.
The invention also provides a method for cutting the maxillofacial area of the appliance, which comprises the following steps:
determining a cutting path of an occlusal surface cutting edge to be removed in the appliance according to the determination method of the maxillofacial cutting path of the appliance;
and cutting the occlusal surface to be removed of the appliance according to the cutting path.
The invention also provides a device for determining the maxillofacial incision path of the appliance, which comprises:
the establishing module is used for establishing the occlusion relation between the upper dental model and the lower dental model;
the acquisition module is used for determining an occlusal surface to be removed according to the occlusion relation and acquiring an occlusion peak contained in the occlusal surface to be removed according to the occlusion relation;
and the determining module is used for determining the cutting path of the cutting edge of the occlusal surface to be removed according to the occlusion peak.
Further, the acquisition module is used for determining an occlusal surface to be removed in the dental model according to the occlusion relation;
the determining module is used for determining a cutting path of an occlusal surface cutting edge to be removed in the dental model according to the occlusal vertex.
Further, the obtaining module is used for obtaining the appliance model according to the occlusion relation between the upper dental jaw model and the lower dental jaw model, and is also used for determining the occlusal surface to be removed in the appliance model according to the occlusion relation;
the determining module is used for determining a cutting path of an occlusal surface cutting edge to be removed in the appliance model according to the occlusal peak.
The present invention also provides an electronic device comprising: comprises a processor and a memory, wherein at least one instruction, at least one program, a code set or a set of instructions is stored in the memory, and the at least one instruction, the at least one program, the code set or the set of instructions is loaded and executed by the processor to realize the method for determining the maxillofacial incision path of the appliance.
The invention also provides a device for cutting maxillofacial surfaces of the appliance, which comprises:
a cutting path determining module, configured to determine a cutting path of an occlusal surface cutting edge to be removed in the appliance by using the determination method of the maxillofacial cutting path of the appliance;
and the cutting module is used for cutting the occlusal surface to be removed of the appliance according to the cutting path.
The present invention also provides an electronic device comprising: the orthodontic appliance comprises a processor and a memory, wherein at least one instruction, at least one program, a code set or a set of instructions is stored in the memory, and the at least one instruction, the at least one program, the code set or the set of instructions is loaded and executed by the processor to realize the orthodontic appliance maxillofacial cutting method.
The method for determining the maxillofacial cutting path of the appliance, the cutting method and the cutting device provided by the invention have the following beneficial effects:
determining an occlusal surface to be removed and an occlusal peak contained in the occlusal surface to be removed by establishing an occlusion relation, automatically fitting a cutting path according to the occlusal peak, automatically identifying and determining a track to be cut, and providing a cutting basis for subsequent laser cutting, wherein the cutting path is accurate and controllable; when preparing the appliance for correcting the concave surface deformity, the cut appliance can be effectively fixed at the relative position between the upper jaw and the lower jaw when being matched with the jaws. When the eruption-assisting device is applied to eruption assistance, the occlusal surface of teeth needing to erupt is correspondingly cut, and the eruption is guided out favorably.
Drawings
FIG. 1 is a flowchart of a method for determining a maxillofacial incision path of an appliance according to an embodiment;
FIG. 2 is a flow chart of one embodiment of a method of determining a maxillofacial resection path of an appliance;
FIG. 3 is a schematic view showing a simulation of a bite relationship between the upper dental model and the lower dental model according to the first embodiment;
FIG. 4 is a schematic view of an occlusion vertex included in an occlusion surface to be removed according to an embodiment;
FIG. 5 is a schematic view of an initial curve of the occlusal surface to be removed according to the first embodiment;
FIG. 6 is a schematic diagram illustrating a trend of the moving direction of the driving curve according to an embodiment;
FIG. 7 is a schematic view of a cutting path of a cutting edge of the bite surface to be removed according to one embodiment;
FIG. 8 is a schematic view of a lower dental appliance having an opening in one embodiment;
FIG. 9 is a schematic view of the upper and lower dental appliances of the first embodiment;
FIG. 10 is a flowchart of one embodiment of a method of determining a maxillofacial incision path of an appliance according to one embodiment;
FIG. 11 is a schematic view of an upper dental appliance model and a lower dental appliance model according to an embodiment;
FIG. 12 is a flowchart of a maxillofacial incision method of the orthosis according to the second embodiment;
FIG. 13 is a flowchart of a maxillofacial incision method of the orthosis according to the third embodiment;
FIG. 14 is a schematic view of an appliance maxillofacial cutting apparatus according to a sixth embodiment;
fig. 15 is a schematic diagram of an electronic device according to a seventh embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.