Dental support occlusion guide plate reconstruction method

Abstract

The invention provides a method for reconstructing an occlusion guide plate of a dentition support, which can solve the problem of occlusion fixation caused by incomplete dentition after a mandible fracture occurs, can fully consider the characteristics of mixed dentition and tooth embryo of children, and can perform customized design according to individual differences of patients. According to the technical scheme, the method comprises the steps that oral cavity data of a patient are obtained, and the obtained oral cavity data comprise deciduous dentition, mixed dentition and tooth embryo positions; three-dimensional reconstruction is carried out on oral cavity data to generate an upper jawbone model, a lower jawbone model, a dentition model and a tooth embryo model, the reconstruction of the occlusion relationship of a child patient suffering from the lower jawbone fracture needs to be realized by anatomical reduction of a fracture line and relative position characteristics of upper teeth and lower teeth during occlusion of an apical fossa, and under the computer-aided design, the reconstruction of the occlusion relationship of the child patient suffering from the lower jawbone fracture is realized. Performing reconstruction and simulated reduction on the mandible model by establishing upper and lower apical fossa occlusion through simulated reduction; generating an occlusal guide plate model through computer digital design of the simulated reset mandible model and the dentition model, and promoting occlusal relationship recovery of a dental crown part of the occlusal guide plate model by adopting tailoring design; a pore channel is established on the occlusion guide plate model based on Boolean operation, the pore channel is established based on anatomical characteristics of the lower jawbone of the patient and the dentition deletion condition, and the position of the pore channel and the position of the tooth embryo are not overlapped.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of maxillofacial plastic medical devices, and relates to a dentition support device and a reconstruction method thereof. BACKGROUND

[0002] In recent years, with the development of personalized precision medicine, digital technology and personalized 3D printing technology are increasingly widely used in the fields of plastic surgery and maxillofacial surgery. In particular, in the treatment of mandibular fractures, accurate reduction and fixation are crucial for restoring the normal occlusal function of patients. However, for children, especially those in the mixed dentition stage, the traditional treatment methods face many challenges due to the incomplete dentition and the presence of unerupted tooth germs.

[0003] Currently, the treatment of mandibular fractures mainly includes non-surgical treatment and surgical treatment. Non-surgical treatment is mainly suitable for fractures without displacement or with slight displacement, and usually uses intermaxillary fixation technology; while surgical treatment is suitable for fractures with obvious displacement, instability or comminution, and usually requires open reduction and internal fixation. In these treatment processes, the reconstruction of occlusal relationship is one of the key links. The traditional occlusal relationship fixation, i.e., maxillo-mandibular fixation (MMF) operation method mainly relies on dental arch splinting, intermaxillary fixation screws and other technologies. However, these methods have obvious limitations when applied to children in the mixed dentition stage (mixed dentition stage), because children at this stage may have malocclusion, missing dentition and unerupted tooth germs, and MMF operation in children may cause complications such as infection, temporomandibular joint stiffness due to early difficulty in opening training, difficulty in speaking, etc. One of the treatment goals for children at this stage is to minimize or completely stop MMF operation. A large number of literature has proved that children's fractures have strong self-healing and remodeling ability, and with the eruption of permanent teeth and the development of the jaw, even severe malposition of the mandibular fracture can achieve satisfactory occlusal relationship effect through simple reduction and fixation. Therefore, in the treatment of the child in this case, we first perform digital simulation to present the dentition and simulate the reduction of the fractured ends of the mandibular fracture, and then manufacture a dentition support type 3D printing guide plate to fix and reduce the fractured ends of the mandibular fracture without MMF operation.

[0004] A digital bite guide based on CT and CBCT fusion data and its reconstruction method (CN105342708B) proposes a solution to the difficulty of occlusal relationship reconstruction. This method uses CBCT and spiral CT fusion data to virtually reconstruct the occlusion, simulate surgical reduction, design an occlusion plate to record the occlusal relationship, and generate a physical guide plate through 3D printing. Although this method improves the accuracy of reconstruction, it does not specifically address the special case of incomplete dentition during the mixed dentition period in children. The digital fabrication method of oral surgery soft and hard tissue protection jaw pad (CN110507426B) combines CBCT and dental scanning three-dimensional images to obtain patient's upper and lower jaw hard tissue and dentition data, and designs personalized protection jaw pads according to the patient's surgical area. Although this method considers individualized design, it does not solve the problem of tooth germ protection during the mixed dentition period in children.

[0005] Therefore, the existing methods do not fully consider the special nature of child patients, especially the complex relationship of deciduous dentition, mixed dentition and tooth germ position. The traditional occlusal guide plate design cannot effectively avoid the tooth germ area, which may affect the normal development of children's teeth. In addition, the existing technology lacks special consideration for the anatomical characteristics of children's mandible and the missing dentition in the design of the hole, resulting in insufficient stability and comfort of the support. Finally, the existing technology lacks an effective method for individualized adjustment of the thickness and structure of the guide plate according to the specific needs of patients, making it difficult to meet the clinical needs of different patients.

[0006] Therefore, there is an urgent need for a dentition support occlusal guide plate reconstruction method that fully considers the characteristics of deciduous dentition and mixed dentition, avoids the tooth germ area, and is customized according to individual differences of patients, to improve clinical treatment effect and patient comfort. SUMMARY

[0007] The purpose of the present application is to provide a dentition support occlusal guide plate reconstruction method that can solve the occlusal fixation problem caused by incomplete dentition after mandibular fracture and fully consider the characteristics of deciduous dentition and mixed dentition in children, and is customized according to individual differences of patients.

[0008] To solve the above technical problems, the present application adopts the following technical solutions: A dentition support occlusal guide plate reconstruction method, comprising: Obtaining patient oral data, the oral data including deciduous dentition, mixed dentition and tooth germ position; Three-dimensional reconstruction of oral data, separating the mandible and tooth model, and exposing the fractured end of the deciduous dentition and tooth germ; Reconstructing and simulating the reduction of the mandibular model; Brushing the occlusal template lining model closely against the dentition, and making the occlusal guide plate model at a set distance from the occlusal guide plate lining model; trimming the crown portion of the deciduous tooth; deleting the occlusal guide liner model; creating a hole on the occlusal guide model based on Boolean operation, the hole is created based on the anatomical features of the patient's mandible and the missing dentition, and the hole position does not overlap with the tooth germ position.

[0009] Further, the three-dimensional reconstruction of the collected oral data includes region growing, threshold adjustment, extraction, and smoothing operation on the collected data.

[0010] Further, the region growing includes identifying and extracting the target region from the CT or MRI scan image, and the target region includes the mandible, dentition and / or tooth germ.

[0011] Further, the threshold adjustment includes extracting the target structure by setting the gray value range, and the target structure includes the mandible, dentition and / or tooth germ.

[0012] Further, the extraction includes selecting the target structure according to the set threshold or region, which is used to extract a specific region from the jaw or dentition, and the specific region includes the tooth germ and / or dentition.

[0013] Further, the smoothing operation is used to eliminate noise in the image and improve the surface quality of the three-dimensional model, and the smoothing operation includes Gaussian smoothing and local smoothing.

[0014] Further, a hole is created on the generated occlusal guide model based on Boolean operation, and the hole avoids the tooth germ position.

[0015] Further, the patient's oral data is obtained based on oral laser scanning technology or head CT scanning technology.

[0016] Further, based on the simulated reset digital mandible model and the generated occlusal guide model, an STL format file is output, and the STL format file is imported into a 3D printer to print the mandible model and the occlusal guide.

[0017] Further, the 3D printer uses photosensitive resin material.

[0018] The beneficial effects of the present application are: The reconstruction of the occlusal relationship of the child with mandibular fracture requires anatomical reduction of the fracture line and the relative position characteristics of the upper and lower teeth when the intercondylar fossa occlusion is achieved. Through digital reconstruction and 3D printing technology, the contact between the guide plate and the tooth germ can be accurately avoided, the tooth germ of children during the replacement tooth period and the development process of permanent teeth is protected, and the problem of tooth germ damage that may occur in the traditional surgical method is avoided.

[0019] The occlusal guide precisely made by the 3D printing technology can provide higher reduction accuracy in the operation, significantly reduces repeated adjustment in the operation, reduces the operation time and improves the operation efficiency.

[0020] The personalized 3D printing guide plate is adopted, the comfort of the patient when wearing after the operation is improved, and the discomfort caused by the traditional occlusal fixation method does not occur. In addition, the adjustability and comfortable design of the 3D printing guide plate can help reduce postoperative complications, such as temporomandibular joint adhesion and oral mucosa injury.

[0021] Through the application of the 3D printing technology, the personalized operation guide plate can be made in a short time, the complexity and time cost of the traditional preoperative and postoperative preparation work are reduced, so that the operation efficiency of the hospital is improved, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The flowchart of one embodiment of the present application.

[0023] Figure 2 The step flowchart of the occlusal guide plate reconstruction of one embodiment of the present application.

[0024] Figure 3 The schematic diagram of the virtual reconstruction model for restoring the upper and lower jaw occlusion relationship of one embodiment of the present application.

[0025] Figure 4 The schematic diagram of the occlusal guide plate lining model made by closely brushing the dentition of one embodiment of the present application.

[0026] Figure 5 The schematic diagram of the screw hole designed by using Boolean operation on the occlusal guide plate of one embodiment of the present application.

[0027] Figure 6 The design diagram of the shaped occlusal guide plate model of one embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described in detail below with reference to the drawings of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] The present application provides a reconstruction method for dentition support, and the specific implementation steps of one specific embodiment of the present application are as follows: Step one: obtaining patient oral data First, the patient's oral data, including the position of deciduous dentition, mixed dentition and tooth germ, are obtained by oral laser scanning or head CT scanning technology. The obtained data not only cover the bone structure, but also include detailed morphological information of the dentition. In an embodiment of the present application, a head spiral CT scan is used, and the layer thickness is set to 0.5 mm, so that the mandible and the surrounding structure can be clearly displayed. At the same time, the CT data of the dentition are collected, and the layer thickness is 0.16 mm, so as to avoid the data distortion or incompleteness problem that may be caused by conventional X-ray film or intraoral scanning.

[0030] Step two: three-dimensional digital reconstruction The DICOM format data collected is processed by three-dimensional reconstruction using Mimics21.0 software. Through three-dimensional reconstruction of the oral data, the three-dimensional digital model of the patient's mandible and dentition, tooth germ is obtained. In the reconstruction process, various operations such as region growing, extraction, threshold adjustment, smoothing, etc. are applied to ensure that the high-precision mandible and dentition model is obtained. The segmentation threshold of CT reconstruction is set to 311-3071HU. Through full digital modeling of the dentition structure (including tooth germ, deciduous teeth, mixed dentition, etc.), the accuracy of the mandible reconstruction and the comprehensive presentation of the dentition are ensured.

[0031] In step two, region growing is an automated process used to identify and extract target regions such as the mandible, dentition, and / or tooth germ from CT or MRI scan images. This method relies on the gray scale values of the image and the similarity of neighboring pixels.

[0032] For example, the region growing implementation steps are as follows: S11 Load CT scan data in Mimics, usually in DICOM format, to display the entire oral anatomy structure; S12 Set a profile line and seed point, and select on the area you want to extract (for example, in the mandible, dentition or tooth germ area); S13 Select the region growing tool, set the threshold parameters (such as gray scale value range, growing neighborhood width, etc.), and start the region growing algorithm; S14 The software automatically expands the region, compares the values of adjacent pixels with the gray scale value of the seed point, and expands to the region that meets the conditions.

[0033] The basic formula of region growing can be expressed as:

[0034] Where: R is the region after growing.

[0035] P is all the pixels in the image.

[0036] I(p) is the gray value of pixel p.

[0037] I(s) is the gray value of seed point s.

[0038] T is the set gray value difference threshold.

[0039] Threshold adjustment refers to extracting the target structure (such as the mandible, dentition or tooth germ) by setting the gray value range, and by adjusting the threshold, selecting the appropriate range to highlight the target structure.

[0040] For example, the threshold adjustment (Thresholding) implementation steps are as follows: S21 loads the CT image data in Mimics and selects the "Thresholding" tool; S22 manually adjusts the gray value range and selects the gray value range of the mandible, dentition or tooth germ. For example, the gray value of the dentition and tooth germ is usually above 1200; S23 previews the extracted area until the ideal area is obtained.

[0041] Formula: Threshold adjustment can be expressed as:

[0042] Where: S is the extracted structure (such as the mandible or dentition).

[0043] I(p) is the gray value of pixel p.

[0044] L and H are the lower and upper gray value ranges, respectively.

[0045] Extraction of specific area refers to extracting the target structure according to the set threshold or area, which is commonly used to extract specific areas (such as tooth germs and / or dentition) from the mandible or dentition.

[0046] For example, the specific implementation steps of extracting a specific area are as follows: S31 extracts the target area according to the preset threshold to ensure accurate selection range; S32 only retains the target mask after extraction and masks other masks, and performs three-dimensional reconstruction or other subsequent processing on the extracted structure.

[0047] The specific steps for extracting the tooth germ area are as follows: Set the threshold to 1200-3000HU, which is the typical gray value range of teeth; After the aforementioned region growth, threshold adjustment, and extraction operations, only the tooth germ mask is retained. The extracted tooth germ data mask is exported and 3D modeling calculation is performed to generate a 3D model of the tooth germ in the 3D quadrant (3D Objects) for subsequent operations.

[0048] Smoothing operations are used to eliminate noise in images and improve the surface quality of 3D models. Mimics provides various smoothing methods, such as Gaussian smoothing and local smoothing.

[0049] For example, the specific steps for implementing a smoothing operation are as follows: In S41, select the "Smoothing" tool in Mimics and choose the area you want to smooth (such as the mandible, dentition, or tooth germ). S42 sets the smoothing parameters, such as the smoothing radius and the number of iterations; S43 performs a smoothing operation, allowing you to view the results and optimize to obtain a satisfactory 3D reconstruction model.

[0050] formula: Smoothing operations can be expressed using the convolution formula:

[0051] in: I′(x,y) is the smoothed image.

[0052] I(x,y) is the original image.

[0053] N is the size of the neighborhood region.

[0054] w(i,j) is the weight of the smoothing kernel (such as the Gaussian kernel).

[0055] Taking a smoothed dental surface as an example, the dental arch region is selected separately after region growth, threshold adjustment, and extraction operations; Set the smoothing radius to 2mm and perform 3 iterations to remove small particle noise on the surface of the dental arch model. Observe the smoothing effect to ensure that the surface is smooth and that important anatomical details (such as cusps, pits, and grooves) are not lost. Obtain the smoothed 3D reconstruction model for subsequent operations.

[0056] For example, the steps for separating the mandibular region are as follows: S51 selects seed points for the mandible in CT images; S52 sets the grayscale threshold range, such as the CT density of bone tissue being approximately between 300-1500 HU.

[0057] S53 initiates region growth. Mimics will automatically identify the mandibular region and expand it with neighboring pixels to ultimately generate a 3D model of the mandibular region.

[0058] Steps for exposing the dentition and tooth germ areas: The S61 sets the grayscale value range of the dental arch to 1200-3000HU. According to oral CT images, the density of teeth is usually within this range. S62 adjusts the threshold in conjunction with the region growth operation until the dental arch region is visible.

[0059] By manipulating the three-dimensional reconstruction model of the separated and extracted anatomical structures such as the mandible, dental arch, and tooth germ, the Toggle transparency function in Mimics software is used to simultaneously display each anatomical structure.

[0060] For example, the specific steps for switching transparency are as follows: Use the toggle transparency function in the Mimics software. In the 3D Objects quadrant, select all the pre-displayed 3D reconstruction models of anatomical structures, and adjust the transparency of each model to switch between three modes (Low / Medium / High) to display each anatomical structure in the same quadrant.

[0061] Step 3: Reconstruct and simulate the repositioning of the mandibular model. Computer-simulated surgery is used to reduce mandibular fractures. In this step, the fractured mandible is virtually reduced to its normal anatomical position based on the patient's normal anatomy. Computer-simulated surgery allows for pre-assessment of the reduction outcome, reducing uncertainties during actual surgery and improving surgical precision.

[0062] Step 4: Reconstruct the occlusal guide plate Based on a 3D digital model, the occlusal guide was reconstructed using 3-matic software. The specific steps included: importing the repositioned mandibular model into 3-matic software; creating an inner lining model of the occlusal guide close to the dentition; creating the occlusal guide model at 3mm intervals based on the inner lining model, trimming the crown areas of the deciduous teeth, and then deleting the inner lining model; creating channels using Boolean operations, based on the anatomical characteristics of the patient's mandible and the extent of tooth loss. Cylinder cylinders used could be marked with different colors, and the cylinder hole diameter was designed according to the screw (1.2mm diameter recommended). The channel positions avoided overlapping with the tooth germ area, and generally four channels were drilled; finally, the Cylinder cylinders were deleted, and the final 3D guide model could be displayed in a more prominent color.

[0063] After resetting the three-dimensional reconstruction model of the mandible generated in the aforementioned steps, import it into the 3-matic software and design the occlusal guide liner model closely following the tension band and dentition of the mandible model. For example, the specific steps for brushing the engagement guide plate are given: Select the Mark function in the 3-matic software; Select Wave Brush Mark from the menu to brush over the lingual and labial sides of the dental arch model.

[0064] The surface area is deformed by a custom "wave function".

[0065] The wave function is used to describe the intensity and range of "waves" on the model surface, and is typically: Z(x,y)=A · sin(kx+ωt) in: Z(x,y) It is the surface in position (x,y) The height of the point (represented as the height of surface deformation in the 3D model); A The amplitude of the wave determines the size of the waveform (usually expressed as the intensity of the waveform in 3-matic). K The wave number determines the frequency of the waveform (in 3-matic, the fineness of the waveform can be adjusted via parameters). ω It is the angular frequency, which controls the speed of the fluctuation; t This refers to time, which is usually unrelated to the static processing of 3D models but can be used for dynamic simulations.

[0066] Perform localized surface deformation: Wave Brush Mark adjusts the amplitude of the waveform. A、 frequency K、 The radius of effect, along with the radius of application, allows for variations in localized surface areas. Adjusting these parameters helps to precisely control the brushing effect.

[0067] Z local (x,y)=A local · sin(kx+ωt) · f(r) in: f(r) It is a local influence function that describes the brushing range. r The intensity of the fluctuation within the area. This function ensures that the fluctuation effect only affects the local area.

[0068] Select the Wave Brush tool: In 3-matic, select the Wave Brush Mark tool and set the wave parameters: Amplitude. A ,frequency K and radius of action r These parameters will affect the waveform effect; Apply Wave Brush Mark: Use the mouse to brush across the model surface, selecting areas where wave adjustments are needed. For example, brush wave marks on the guide plate area of ​​the mandibular model to simulate the design requirements of the treatment area; Adjusting Wave Parameters: By adjusting the wave intensity and frequency, refine the marked area to ensure the brushing effect meets design requirements. Select different waveform modes as needed to obtain the best results; View and modify the marked areas: After completing the waveform marking, view the waveform changes of the model. If necessary, you can readjust the parameters to ensure the model surface achieves the desired design.

[0069] Design an occlusal guide liner and apply the Wave Brush Mark function; Select the waveform brush tool and set the amplitude to 2mm, the frequency to 5 cycles (for waveform fineness), and the radius of action to 10mm; Apply the waveform to the surface of the mandible, especially in areas requiring increased guide support or repair. Observe the effect and adjust the amplitude and frequency until the surface of the guide liner is smooth and meets the design requirements. Fabricate an occlusal guide model at a distance of 3-4 mm from the occlusal guide liner model.

[0070] In 3-matic software, based on the aforementioned liner model, switch to the Design mode and select Uniform offset; set appropriate parameters (distance, thickness, etc.) to design and manufacture an interlocking guide plate model with the same shape as the liner model.

[0071] The aforementioned lining model has been completed. In the 3-matic software, switch to Design mode and select the Uniform offset function. Set a bite guide model 3mm away from the inner lining model and 2mm thick. The bite guide model has the same shape as the inner lining model. Finally, delete the inner lining model.

[0072] The crown portion of the deciduous tooth corresponding to the occlusal guide is cut and designed; The specific steps for displaying the mandibular deciduous tooth crown using a occlusal guide model are as follows: The 3-matic software simultaneously displays the mandible, (deciduous) dentition, and occlusal guide models; using the trim function, trimming is performed on the (deciduous) dentition crowns corresponding to the occlusal guide models until the complete mandibular deciduous tooth crowns are exposed.

[0073] Screw holes were designed in the mandibular model.

[0074] In 3-matic, both the tooth germ and the occlusal guide model are simultaneously exposed; Four Cylinder cylinders with a diameter of 1.2 mm were designed on the occlusal guide model to avoid the tooth germ location.

[0075] Perform a Boolean subtraction operation: remove the overlapping portion of the Cylinder cylinder and the bite guide model.

[0076] The difference operation is a Boolean operation that removes the overlapping portions of one object from another, preserving the non-overlapping regions. The mathematical formula for the difference operation can be expressed as: C=A-B in: A It is the first three-dimensional model object; B It is the second 3D model object; C It is the result of the difference set.

[0077] After the difference operation, the Cylinder cylinders are deleted, leaving four suitable channels in the occlusal guide model to ensure that the design of the occlusal guide model meets the surgical requirements.

[0078] 3D-printed occlusal guides serve to fix teeth. The position of the guide crown is designed to expose the crown of the patient's own mandibular deciduous teeth, allowing for better contact with the maxillary deciduous teeth to form a correct occlusal relationship. Because traditional maxillary and mandibular occlusal fixation MMF procedures are not used, early postoperative mouth opening exercises can promote joint movement, reduce temporomandibular joint adhesions, and thus restore the normal position of the temporomandibular joint. Children's fractures have a strong ability to heal and remodel. With the eruption of permanent teeth and jawbone development, even severe mandibular fractures can achieve satisfactory results through simple reduction and fixation.

[0079] Step 5: 3D Printing Manufactured using high-precision photosensitive resin 3D printing technology, with a printing accuracy of 0.1mm, the resulting occlusal guide perfectly matches the patient's oral structure. 3D printing technology enables highly personalized occlusal guides to be produced in a short time, ensuring the precision and quality of each component. The thickness and structure of the guide can be adjusted according to the patient's specific needs, and through sophisticated modeling techniques, it provides stable occlusal support.

[0080] Throughout the reconstruction process, the occlusal guide of the dental arch support is fabricated using the steps described above. Due to the presence of the gums and postoperative swelling, an appropriate gap (e.g., 3mm) is left between the mandibular model and the occlusal guide in the design to ensure precise fit to the patient's dentition. Screws are placed through pre-designed channels for fixation, effectively avoiding the tooth germ position and reducing the impact on the patient's future tooth development. This method combines digital technology and 3D printing technology, improving the fabrication accuracy and individualization of the occlusal guide, providing a more precise treatment plan for patients with mandibular fractures. Operating based on CT data allows for the simultaneous acquisition of high-precision bone structure and dentition information, providing a reliable data foundation for the precise design of the dental arch support. This method is particularly suitable for mandibular fracture fixation in children during the mixed dentition period. In cases of malocclusion and dentition defects, the personalized 3D-printed dental arch support occlusal guide has unparalleled advantages in tension band fixation.

[0081] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0082] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0083] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0084] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method of reconstruction of a denture support occlusal guide, characterized in that, The method comprises the following steps: acquiring patient oral cavity data, which includes upper and lower jaw bones, deciduous tooth row, mixed tooth row and tooth germ position; performing three-dimensional reconstruction on the oral cavity data, separating the lower jaw bone and tooth model after virtually resetting the upper and lower jaw occlusion relationship, and exposing the fractured deciduous tooth row and tooth germ; manufacturing an occlusion guide plate on the lower jaw bone fracture model; brushing the occlusion template lining model close to the tooth row, and manufacturing an occlusion guide plate model at a set distance from the occlusion guide plate lining model; cutting the deciduous tooth crown part; deleting the occlusion guide plate lining model; creating a channel on the occlusion guide plate model based on Boolean operation, the channel being created based on the anatomical characteristics of the patient's lower jaw bone and the tooth row loss, and the channel position not overlapping with the tooth germ position.

2. The denture support occlusion guide reconstruction method according to claim 1, characterized in that The three-dimensional reconstruction of the oral cavity data includes region growing, threshold adjustment, extraction and smoothing operation on the collected data.

3. The denture support occlusion guide reconstruction method according to claim 2, characterized in that The region growing includes identifying and extracting the target region from the CT or MRI scan image, and the target region includes the lower jaw bone, tooth row and / or tooth germ.

4. The denture support occlusion guide reconstruction method according to claim 2, characterized in that The threshold adjustment includes extracting the target structure by setting the gray value range, and the target structure includes the lower jaw bone, tooth row and / or tooth germ.

5. The denture support occlusion guide reconstruction method according to claim 2, wherein The extraction includes selecting the target structure according to the set threshold or region, which is used to extract a specific region from the jaw bone or tooth row, and the specific region includes the tooth germ and / or tooth row.

6. The denture support occlusion guide reconstruction method according to claim 2, wherein The smoothing operation is used to eliminate noise in the image and improve the surface quality of the three-dimensional model, and the smoothing operation includes Gaussian smoothing and local smoothing.

7. The denture support occlusion guide reconstruction method according to claim 2, wherein: A channel is created on the generated occlusion guide plate model based on Boolean operation, and the channel avoids the tooth germ position.

8. The method according to any one of claims 1 to 7, wherein the method further comprises the step of: The patient oral cavity data is acquired based on oral laser scanning technology or head CT scanning technology.

9. The denture support occlusion guide reconstruction method according to claim 8, wherein, Based on the simulated reset digital lower jaw bone model and the generated occlusion guide plate model, an STL format file is output, the STL format file is imported into a 3D printer, and a lower jaw bone model and an occlusion guide plate are printed.

10. The denture support occlusion guide reconstruction method according to claim 9, wherein, The 3D printer uses photosensitive resin material.

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