CN115886863A

CN115886863A - Tooth and facial bone three-dimensional overlapping measurement method and device with total skull base as datum plane

Info

Publication number: CN115886863A
Application number: CN202211595854.XA
Authority: CN
Inventors: 孔卫东; 查蕴宸; 李舒舒; 孔德明
Original assignee: First Affiliated Hospital of Jinan University
Current assignee: First Affiliated Hospital of Jinan University
Priority date: 2022-12-12
Filing date: 2022-12-12
Publication date: 2023-04-04

Abstract

The invention provides a tooth and facial bone three-dimensional overlapping measurement method and equipment with a total skull base as a reference plane, the method comprises the steps of obtaining front and back stage CBCT (cone beam projection computer reconstruction tomography) data to be compared, converting the CBCT data format, respectively establishing three-dimensional models for comparing front and back teeth and jaw bones, determining a coordinate system, marking mark points of the total skull base plane, namely a skull base point (Ba), a nasal root point (N), upper orbital incisal tracks (UOrN) on two sides and a middle point (O) of lower edges of the two sides so as to determine a skull base standard plane, overlapping the CBCT data to be compared by using the standard plane as the reference plane, automatically identifying by a computer, registering and overlapping again, marking points and measuring the change of the teeth, alveolar bones and facial jaws in the three-dimensional direction. By the method and the device, the CBCT data of the dentition and the jaw bone of the patient can be converted into the 3D model and overlapped, and the change of the teeth and the jaw bone can be evaluated and measured in the three-dimensional direction.

Description

Tooth and facial bone three-dimensional overlapping measurement method and device with total skull base as datum plane

Technical Field

The invention relates to the technical field of three-dimensional measurement, in particular to a tooth and facial bone three-dimensional overlapping measurement method, device, equipment and storage medium with a total skull base as a reference plane.

Background

The cephalogram measuring method is a necessary means required to be adopted in oral orthodontic clinical work, and has the function of providing reliable information for clinical diagnosis, reasonable treatment plan formulation and postoperative curative effect analysis by measuring index data of teeth, jaws, soft tissues and the like of patients in different stages before, during and after treatment. However, this method is susceptible to interference from overlaps or inaccurate positioning, resulting in the inability to accurately measure some of the indicators of clinical interest. In addition, the cephalogram measurement method only reflects the two-dimensional position change conditions of the jaw bone and the teeth in the sagittal direction and the vertical direction, cannot simultaneously realize measurement and analysis in three-dimensional directions such as the sagittal direction, the vertical direction, the horizontal direction and the like, and has limited application range.

With the clinical application of Cone Beam CT (CBCT), all three-dimensional data information of the skull, jaw and teeth can be obtained simultaneously. The existing software can be used for effectively establishing a measuring method of hard tissues such as cranium, jaw bone, teeth and the like in three-dimensional directions such as sagittal direction, vertical direction, horizontal direction and the like. Therefore, a new three-dimensional contrast measurement method is provided, the conversion and the overlapping of three-dimensional models of the skull, the jaw bone and the tooth at different stages can be realized only by CBCT data, and the dynamic change conditions of tooth movement and jaw bone form change in the three-dimensional direction are clearly displayed.

The aim of orthodontics is to better coordinate the relationship between teeth, jaw, and face. The mutual position relationship between teeth and jaw bones is known before, during or after orthodontic treatment, so that the aims of reasonably making a treatment plan, adjusting a treatment scheme and discussing related mechanisms can be fulfilled. Therefore, the establishment of a reasonable and effective tooth and jaw three-dimensional measurement method has certain clinical application value, and is a technical means for helping to realize accurate orthodontic treatment.

The traditional comparison measurement method comprises the following steps: method 1, overlap the skull side slice needed to be compared, and estimate the change of teeth and jaw by tracing the position change of each marking point. The disadvantages of this method are: the skull side film is difficult to realize accurate repetition of the head position when shooting every time, the skull side film is two-dimensional imaging data, the definition of results is influenced by the overlapping of tissues of the jaw faces at two sides, and fixed point errors are easily caused. In addition, the trace points of the cranial slice may become unreliable when the projection plane is rotated. Therefore, this method suffers from head position variation and inaccurate positioning, and reflects only approximate two-dimensional position variation of the jaw and teeth, and cannot accurately measure the distance moved.

And 2, converting Cone Beam CT (CBCT) data into a model and registering the model with tooth data acquired by an oral scanner, thereby measuring the moving distance of the teeth before and after treatment. The disadvantages of this method are: the intraoral scanning time is long, and repeated scanning is needed when a complex structure is encountered, so that the workload is large; cross infection is easily caused by repeatedly using the mouth scanning probe; when a three-dimensional model is constructed, different coordinate systems are adopted by a mouth scan model and a CBCT model, so that a quasi-matching error can be caused; the oral scan can only acquire data of the dental crown part of the tooth, namely the dental crown part can only be compared, the form of the dental root and the change data of the jaw bone are lost, and the data can not be matched with the data of the dental root and the jaw bone in CBCT during comparison, so that the data is wasted.

In summary, the conventional comparison method has the following disadvantages: due to the limitation of a two-dimensional plane, the overlapping result of the lateral skull film cannot reflect the three-dimensional changes of dentition and jaw bone; due to the influence of overlapping of soft and hard tissues on two sides, the measurement result of the distance is not accurate enough; the mouth broom needs to be operated in the mouth of a patient, so that the operation difficulty is increased, and the epidemic prevention work is not facilitated to be carried out; the oral scan can only obtain the data of the dental crown, but the data of the dental root and the jaw bone are deficient. Therefore, a new three-dimensional contrast measurement method is provided, the transformation and the overlapping of the three-dimensional models of the teeth and the jaw bone can be realized only through CBCT data, and the morphological and position changes of the whole teeth and the jaw bone can be clearly displayed. The method optimizes the existing three-dimensional plane overlay measurement method, can help clinical workers to observe the three-dimensional movement direction and position of the teeth and the jaw bone, and has visual and visualized clinical guidance significance.

Disclosure of Invention

The invention provides a tooth and facial bone three-dimensional overlapping measurement method, a device, equipment and a storage medium with a total skull base as a reference plane, aims to help clinical workers to observe the three-dimensional moving direction and position of teeth and jaw bones, and has visual and visualized clinical guidance significance.

Therefore, the first purpose of the invention is to provide a tooth and facial bone three-dimensional overlapping measurement method taking the total skull base as a reference plane, which comprises the following steps:

acquiring cone beam projection computer recombined tomography (CBCT) data of front and back stages to be compared, and converting the CBCT data format;

respectively establishing three-dimensional models for comparing front and rear teeth with jaw bones, determining a coordinate system, and marking index points of a full skull base plane to determine a skull base standard plane;

and taking the standard plane as a reference plane, overlapping the CBCT data to be compared, identifying, registering, overlapping and marking points, and measuring the change of the teeth, the alveolar bones and the facial jaws in the three-dimensional direction.

Wherein, in the step of respectively establishing three-dimensional models of the front and rear teeth and the jaw bone for comparison, the method comprises the following steps:

acquiring target dentition and jaw data to be compared of a patient through CBCT scanning, and importing the CBCT data into modeling software in a DICOM format file;

generating three-dimensional coordinates of the model, adjusting the contrast of the model, separating upper and lower jaws, upper and lower dentitions by threshold segmentation, and performing three-dimensional reconstruction;

the model is cut with modeling software, the jaw and teeth are cut into separate parts, and a set is built up.

Wherein, in the step of marking the marking points of the complete skull base plane to determine the skull base standard plane,

marking a skull base point (Ba), a nasion root point (N), upper orbital notches (UOrN) on both sides and a lower orbital midpoint (O) on both sides of a skull base plane as mark points;

and determining a standard plane through the mark points, preliminarily overlapping the CBCT data models to be compared by taking the standard plane as a reference plane, and then automatically registering and overlapping through a computer.

The method comprises the following steps of taking a standard plane as a reference plane, overlapping CBCT data to be compared, identifying, registering, overlapping and marking points, and measuring the change of teeth, alveolar bones and facial jaws in a three-dimensional direction, wherein the steps comprise:

distinguishing two CBCT data models which need to be compared by adjusting different colors and transparencies;

marking a measuring point on the tooth or jaw bone in the three-dimensional direction, and measuring the three-dimensional movement position change of the same point on the overlapped model to obtain the movement distance between the tooth and the jaw bone;

and (3) separating the overlapped model of the target tooth or jaw part independently, measuring the rotation and shaft inclination angle by taking the long axis of the tooth body as a standard, measuring the rotation angle of the maxilla by taking ANS-PNS as a standard, and measuring the rotation angle of the mandible by taking the lower jaw plane as a standard.

Wherein the cone beam projection computed tomography (CBCT) data at least comprises three-dimensional data of positions and morphological structures of maxilla, mandible, alveolar bone, dentition, dental crown and tooth root.

The tooth marking measurement points are root cusp points or cusp points before and after treatment of a target tooth, and the movement distances of the root cusp points and the cusp points before and after orthodontic treatment along the X axis, the Y axis and the Z axis are respectively measured to quantify the three-dimensional movement of the tooth.

Marking jaw marking points, namely selecting upper alveolar seat points, anterior nasal ridge points, nasal root points, infraorbital points and the like, and respectively measuring the moving distances of the same marking point along an X axis, a Y axis and a Z axis before and after orthodontic treatment so as to quantify a three-dimensional moving coordinate system of the jaw;

the tooth body rotation angle is the rotation angle of the tooth around the tooth body long axis observed after the three-dimensional models are overlapped;

the jaw rotation angle is the rotation angle of the maxilla around ANS-PNS or the rotation angle of the mandible around the mandible plane observed after the three-dimensional model is overlapped.

The second purpose of the invention is to provide a tooth and facial bone three-dimensional overlapping measuring device taking the total skull base as a reference plane, which comprises:

the data acquisition module is used for acquiring cone beam projection computer recombined tomography (CBCT) data of front and back stages to be compared and converting the CBCT data format;

the model building module is used for respectively building three-dimensional models for comparing front and back teeth and jawbones, determining a coordinate system, and marking index point skull base points of a full skull base plane to determine a skull base standard plane;

and the measuring module is used for overlapping the CBCT data to be compared by taking the standard plane as a reference plane, identifying, registering, overlapping and marking points, and measuring the change of teeth, alveolar bones and facial jaws in the three-dimensional direction.

A third object of the present invention is to provide an electronic apparatus, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to perform the steps of the method of the preceding claims.

A fourth object of the present invention is to propose a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the steps of the method according to the aforementioned technical solution.

Different from the prior art, the tooth and facial bone three-dimensional overlapping measurement method taking the total basis of cranium as the reference plane provided by the invention comprises the steps of obtaining the CBCT (cone beam projection computer recombination tomography) data of the front and back stages to be compared, converting the CBCT data format, respectively establishing three-dimensional models of the front and back teeth and the jaw bone, determining a coordinate system, marking the marking points of the total basis of cranium (Ba) and the nose root (N) to determine the standard plane of the basis of cranium, taking the standard plane as the reference plane, overlapping the CBCT data to be compared, automatically identifying by a computer, registering and overlapping again, marking points and measuring the change of the tooth, alveolar bone and facial jaw bone in the three-dimensional direction. By the method and the device, the CBCT data of the dentition and the jaw bone of the patient can be converted into the 3D model and overlapped, and the change of the teeth and the jaw bone can be evaluated and measured in the three-dimensional direction.

Drawings

The invention and/or additional aspects and advantages will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic flow chart of a method for measuring the three-dimensional overlap of teeth and facial bones with the basis of the total skull base provided by the invention.

Fig. 2 is a schematic diagram of landmark points of a skull base point (Ba), a nasion root point (N), bilateral supraorbital notches (UOrN) and a bilateral infraorbital midpoint (O) in the tooth and facial bone three-dimensional overlap measurement method using the total skull base as a reference plane provided by the invention.

Fig. 3 is a schematic diagram of three-dimensional movement distances on XYZ axes after treatment of the same marker in the method for measuring three-dimensional overlap of teeth and facial bones with the total skull base as a reference plane according to the present invention.

Fig. 4 is a schematic diagram of the variation of the opening and closing of anterior dentition with age in the three-dimensional overlap measurement method of teeth and facial bones with the total skull base as the reference plane provided by the invention.

Fig. 5 is a schematic diagram of a mark point when an upper alveolar seat point (point a) and the like are used as mark points for measurement in the three-dimensional overlap measurement method of teeth and facial bones with the total skull base as a reference plane provided by the invention.

Fig. 6 is a schematic side view of the mark point moving backward when the upper alveolar seat point (point a) is used as the mark point for measurement in the three-dimensional overlap measurement method of the tooth and the facial bone with the total skull base as the reference plane provided by the invention.

Fig. 7 is a schematic structural diagram of a tooth and facial bone three-dimensional overlapping measuring device with a total skull base as a reference plane according to the invention.

Fig. 8 is a schematic structural diagram of a non-transitory computer-readable storage medium storing computer instructions according to the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.

As shown in fig. 1, a method for measuring three-dimensional overlap of teeth and facial bones with a total basis skull as a reference plane provided in an embodiment of the present invention specifically includes:

s110: acquiring cone beam projection computer recombined tomography (CBCT) data of front and back stages to be compared, and converting the CBCT data format.

generating three-dimensional coordinates of the model, adjusting the contrast of the model, separating upper and lower jaws and upper and lower dentitions through threshold segmentation, and performing three-dimensional reconstruction; the three-dimensional coordinates are automatically generated by modeling software according to the imported CBCT three-dimensional data; the threshold segmentation is to make bones and teeth clearly contrast by adjusting contrast, separate upper and lower jaws and upper and lower dentitions by proper threshold units, store the separated upper and lower jaws and upper and lower dentitions as STL format files, and perform three-dimensional reconstruction.

The model is cut with modeling software, the jaw and teeth are cut into separate parts, and a set is built up. The model cutting is to cut and trim along the edges of the target dentition and the jaw respectively in modeling software, and cut the target dentition and the jaw into separate parts with clear edges. The jaw data before fixed treatment is set up into a group, and the treated jaw and the treated dentition are set up into a group, so that the treated dentition can move integrally along with the treated jaw.

S120: respectively establishing three-dimensional models for comparing front and back teeth with jaw bones, determining a coordinate system, and marking index point skull base points of the whole skull base plane to determine a skull base standard plane.

Marking a skull base point (Ba), a nasion root point (N), a bilateral supraorbital notch (UOrN) and a bilateral infraorbital midpoint (O) of the whole skull base plane as mark points;

After the computer registration superposition is formed into a primary superposition model, automatically identifying points at the same position on the model through the computer to carry out secondary superposition, repeating for many times to improve the precision of the accurate registration, finishing the repeated registration until the error value displayed by the computer is not reduced, and storing the superposed data in an STL format.

S130: and taking the standard plane as a reference plane, overlapping the CBCT data to be compared, identifying, registering, overlapping and marking points, and measuring the change of the teeth, the alveolar bones and the facial jaws in the three-dimensional direction.

And distinguishing two CBCT data models needing comparison by adjusting different colors, transparencies and the like.

The three-dimensional directions mark measurement points on the teeth or the jaw, and three-dimensional movement position changes of the same points on the post-superimposition model are measured to obtain the movement distance of the teeth from the jaw.

When the tooth is measured, the model of the tooth can be separated out independently, the measurement result is prevented from being influenced by adjacent teeth of the target tooth and peripheral alveolar bones, and the overall position change of the target tooth relative to the dentition can be observed in the dentition.

When the jaw bone is measured, the model of the jaw bone can be separated independently, and the measuring result is prevented from being influenced by dentition or other facial bones.

The tooth marking measurement points are root cusp points or cusp points before and after treatment of a target tooth, and the movement distances of the root cusp points and the cusp points along the X axis, the Y axis and the Z axis before and after orthodontic treatment are respectively measured so as to quantify the three-dimensional movement of the tooth. The physical meaning of the coordinate system is described in table 1 below:

TABLE 1 physical significance of the coordinate systems

Marking jaw marking points are that an upper alveolar seat point, an anterior nasal crest point, a nasal root point, an infraorbital point and the like are selected, and the moving distances of the same marking point along an X axis, a Y axis and a Z axis before and after orthodontic treatment are respectively measured to quantify a three-dimensional moving coordinate system of the jaw.

The tooth body rotation angle is the rotation angle of the tooth around the tooth body long axis observed after the three-dimensional model is overlapped.

The jaw rotation angle is the rotation angle of the maxilla around ANS-PNS or the rotation angle of the mandible around the mandible plane, which is observed after the overlapping according to the three-dimensional model; other measurement indexes can be added and applied according to the needs of doctors.

The specific implementation steps of the case are as follows:

example 1: in this embodiment, the patient has a right maxillary posterior occlusion, and after traction is performed on the occlusion, the curved surface fragment sheet and the cranial side sheet can only display the movement of the occlusion in the two-dimensional direction. Since the moving amplitude is small, the specific moving amount is unknown. CBCT data of the whole skull of a patient before and after treatment are obtained through scanning, the CBCT data are imported into modeling software in a DICOM format, three-dimensional coordinates of an image are automatically generated, the three-dimensional coordinates of the image are determined, rendering is clicked to adjust contrast, and maxilla dentition are separated out through proper threshold units respectively to carry out three-dimensional reconstruction. The three-dimensional models before and after treatment are cut to cut the jaw and teeth into separate parts. Original coordinates of the jaw and dentition before treatment are fixed, and the treated jaw and the treated dentition are established into a group, so that the treated dentition can move integrally along with the treated jaw. Selecting marking points (skull base point (Ba), nasion point (N), bilateral supraorbital notch (UOrN) and bilateral infraorbital midpoint (O)) of a full skull base plane before and after treatment to determine a standard plane (figure 2), performing preliminary overlapping on a CBCT data model needing comparison by taking the standard plane as a reference plane, automatically overlapping the jaw bones before and after treatment by using a computer, counting 2 ten thousand points for overlapping, and repeating the calculation for 3 times to improve the accuracy of matching so as to completely overlap the jaw bones and dentitions after treatment to the jaw bone positions before treatment. The overlapped models of the right posterior maxillary buried teeth 16 and 17 are separated, the buccal root apex point and the palatal root apex point of the right posterior maxillary buried teeth 16 and 17 before and after treatment are respectively marked, and the three-dimensional moving distance on the XYZ axis before and after treatment of the same marked point is measured (figure 3). All numerical measurements are carried out three times to obtain an average value, and the three-dimensional moving distances of the affected teeth 16 and 17 in the vertical direction, the horizontal direction and the disorderly direction are measured.

Example 2 the patient of the present example is a juvenile patient whose anterior teeth are opened and closed, and who is in a growth development peak stage, CBCT data of the patient during 3 years of observation and treatment are collected in order to observe that the opening and closing conditions of the dentition are influenced by the growth and development. And building a three-dimensional model of a jaw bone and a dentition, overlapping, separating a dental crown and a dental root part, and observing the change of the dentition. The final results show that the opening and closing of the anterior dentition increases significantly with age (fig. 4).

Example 3: this example is a patient classified by Anshi class II 2, maxillary protrusion. The anterior teeth of the patient adducted and the facial form improved after the treatment. CBCT data before and after treatment of a patient are collected, a three-dimensional model of a jaw bone and a dentition is established and then overlapped, and the jaw bone and a part of the jaw bone are separated. The final overlap showed significant adduction and mandibular advancement in this patient. The above alveolar seat point (point a) was measured as a mark point, and the mark point was found to move back by about 3mm (fig. 5 and 6).

The three-dimensional measurement method for different stages of the skull, the jaw bone and the teeth can be provided for each patient needing orthodontic treatment. The method effectively overcomes the defects of the traditional two-dimensional head shadow measuring method, and is further perfection and optimization of the existing three-dimensional direction overlapping measuring method. The measurement method can provide a visual and visual diagnosis and process monitoring means for clinical orthodontic practice and also provide a feasible three-dimensional analysis method for studying and judging a postoperative mechanism. Meanwhile, better economic benefit and social effect can be generated, and the method has good industrialization prospect.

Compared with the prior art, the method has the following beneficial effects:

1. it is difficult to directly measure the torsion, inclination angle, three-dimensional moving distance of the tooth in the mouth or in a two-dimensional plane. The three-dimensional overlay measurement method of the technology can realize measurement of the data outside the oral cavity by establishing a three-dimensional model of the target dentition and the jaw bone and completely overlapping the jaw bone and the dentition under the same coordinate system.

2. In the case of an embedded tooth, the process of tooth traction is very slow. When the moving amplitude of the teeth is small, the moving errors of the teeth observed on the panoramic film and the skull side film are large. The three-dimensional overlapping measurement technology can be used for measuring the moving distance of the affected tooth in the three-dimensional direction more accurately, and helps orthodontics to master the treatment process better.

3. The growth rotation of the jaw bone has an effect on both the torque of the teeth and the width of the dental arch. The three-dimensional overlapping measurement of the jaw bone change can help to predict the growth and development trend of the jaw bone and make a more appropriate treatment scheme.

4. For the cases of insufficient maxillary width and maxillary anterior protruding arch stenosis, arch expansion treatment is often required. Three-dimensional overlay measurements versus patient arch width changes before and after arch expansion can help physicians assess the effectiveness of arch expansion. In addition, after the palatal suture is opened by quickly expanding the arch, the expanded palatal suture can recur to a certain extent due to the tension of palatal soft tissue, and the monitoring and the maintenance of the width of the dental arch can be well carried out by contrast measurement.

5. One of the aims of orthodontic treatment is to eliminate pathological occlusion interference factors, reestablish occlusion, adapt and reconstruct joints through the change of occlusion relations, and well display the reconstruction condition of the condyles by comparing and analyzing the energy form changes of the condyles and the articular fossa through three-dimensional overlay measurement.

6. The existing three-dimensional model overlapping technology is improved and optimized, and the step of obtaining an oral scanning model is omitted, so that the operation is simpler and more convenient, and the risk of infectious disease transmission is reduced.

As shown in fig. 7, the present invention provides a three-dimensional overlap measuring device 300 for teeth and facial bones with a total basis of skull, comprising:

the data acquisition module 310 is configured to acquire cone beam projection computed tomography (CBCT) data of a preceding stage and a following stage to be compared, and convert a CBCT data format;

the model construction module 320 is used for respectively establishing three-dimensional models for comparing the front and rear teeth and the jaw bones, determining a coordinate system, and marking index point skull base points of the full skull base plane to determine a skull base standard plane;

and the measuring module 330 is configured to overlap the CBCT data to be compared with each other with the standard plane as a reference plane, identify, register, overlap and mark points, and measure changes of the teeth, alveolar bones and facial jaws in the three-dimensional directions.

In order to implement the embodiment, the present invention further provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to perform the steps of the tooth and facial bone three-dimensional overlay measurement method of the foregoing technical solution.

As shown in fig. 8, the non-transitory computer readable storage medium 800 includes a memory 810 of instructions executable by the processor 820 to perform a method according to a three-dimensional overlap of a tooth and a facial bone. Alternatively, the storage medium may be a non-transitory computer readable storage medium, for example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

To achieve the embodiments, the present invention also proposes a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a tooth and facial bone three-dimensional overlay measurement as embodiments of the present invention.

In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic representation of the terms does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the described embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

One of ordinary skill in the art will appreciate that all or part of the steps carried by the method implementing the embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and the program, when executed, includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The mentioned storage medium may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the embodiments described herein without departing from the scope of the invention.

Claims

1. A tooth and facial bone three-dimensional overlapping measurement method taking the total skull base as a datum plane is characterized by comprising the following steps:

respectively establishing three-dimensional models for comparing front and back teeth with jaw bones, determining a coordinate system, and marking index point skull base points of a complete skull base plane to determine a skull base standard plane;

and taking the standard plane as a reference plane, overlapping the CBCT data to be compared, identifying, registering, overlapping and marking points, and measuring the change of the teeth, alveolar bones and facial jaws in the three-dimensional direction.

2. The method for measuring the three-dimensional overlap of teeth and facial bones with the basis of the total skull base as the reference plane according to claim 1, wherein the step of establishing the three-dimensional models of the teeth and the jaw bones before and after the comparison respectively comprises:

3. The method for measuring the three-dimensional overlap of teeth and facial bones with the cranium base as the reference plane according to claim 2, wherein in the step of marking the index points of the cranium base plane to determine the standard plane of the cranium base,

4. The method for measuring the three-dimensional overlapping of the tooth and the facial bone with the total skull base as the reference plane according to claim 3, wherein the step of overlapping the CBCT data to be compared with the standard plane as the reference plane, identifying, registering, overlapping, marking, and measuring the change of the tooth, the alveolar bone and the facial jaw bone in the three-dimensional direction comprises:

marking a measuring point on the tooth or the jaw bone in the three-dimensional direction, and measuring the three-dimensional movement position change of the same point on the overlapped model to obtain the movement distance between the tooth and the jaw bone;

5. The method of claim 1, wherein the cone beam projection computed tomography (CBCT) data comprises at least three-dimensional data of positions and morphological structures of maxilla, mandible, alveolar bone, dentition, crown and root of tooth.

6. The method for measuring the three-dimensional overlapping of the tooth and the facial bone with the full skull base as the reference plane according to claim 1, wherein the measurement points for marking the tooth are selected from the apical points or the apical points before and after treatment of the target tooth, and the movement distances of the apical points and the apical points before and after orthodontic treatment along the X axis, the Y axis and the Z axis are respectively measured to quantify the three-dimensional movement of the tooth.

7. The method for measuring the three-dimensional overlapping of a tooth and a facial bone by taking the total basis of the skull as a reference plane according to claim 1, wherein the marked jaw bone mark points are selected from a superior alveolar seat point, an anterior nasal crest point, a nasal root point, an infraorbital point and the like, and the moving distances of the same mark point along the X axis, the Y axis and the Z axis before and after orthodontic treatment are respectively measured to quantify a three-dimensional moving coordinate system of the jaw bone;

the jaw rotation angle is the rotation angle of the maxilla around ANS-PNS or the rotation angle of the mandible around the mandible plane observed after the overlapping according to the three-dimensional model.

8. A tooth and facial bone three-dimensional overlapping measuring device taking the total skull base as a datum plane is characterized by comprising:

and the measuring module is used for overlapping the CBCT data to be compared by taking the standard plane as a reference plane, identifying, registering, overlapping and marking points, and measuring the change of the teeth, alveolar bones and facial jaws in the three-dimensional direction.

9. An electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the method of any one of claims 1-7.

10. A non-transitory computer readable storage medium having stored thereon computer instructions for causing the computer to perform the steps of the method according to any one of claims 1-7.