Construction method for post-implantation secondary digital repair of edentulous patient

Abstract

The invention discloses a construction method for post-implantation second-stage digital repair of an edentulous jaw patient. The construction method comprises the following steps: acquiring a preoperative occlusion CT image; after an operation, a scanning rod is mounted on the composite abutment or the implant; obtaining a scanning rod type postoperative CT image and oral cavity scanning data; reconstructing the skull according to the postoperative CT image to obtain a first three-dimensional model; fitting the oral cavity scanning data with the first three-dimensional model to obtain a second three-dimensional model; reconstructing the skull according to the preoperative occlusion CT image to obtain a third three-dimensional model; fitting the second three-dimensional model and the third three-dimensional model to obtain oral cavity scanning data with correct occlusion; based on oral cavity scanning data with correct occlusion, post-repair is designed. According to the method, the printing steps of the 3D model are reduced, the production time is shortened, and the precision of the restoration is improved. Moreover, the method prevents a doctor from repeatedly wearing and dismounting accessories in the mouth of the patient, simplifies the steps, improves the chair-side efficiency, and improves the experience feeling of the patient.

Description

Technical Field

[0001] The present invention belongs to the technical field of edentulous implantology, and particularly relates to a construction method for the second-stage digital restoration after implant surgery for edentulous patients. Background Art

[0002] After the patient has the implant inserted and before wearing the implant denture, it is necessary to accurately transfer the positional relationship of the implant in the patient's mouth and the positional relationship of the hard and soft tissues of the upper and lower jaws to the technician. In the prior art, the following methods are usually adopted: 1. The traditional impression method using silicone rubber impression material and tray to transfer the implant position and hard and soft tissues, and using wax or silicone rubber material to transfer the positional relationship of the upper and lower jaws (bite registration); 2. The digital impression method of assembling corresponding digital scanning rods at the implant level or abutment level according to different types of implants, and using wax or silicone rubber material to transfer the positional relationship of the upper and lower jaws (bite registration). After receiving the data, the dental laboratory reconstructs the data into a processable file and prints it out with a printer, and fabricates the denture on the printed model according to the existing positional relationship. The process is cumbersome and lengthy, requires particularly high technical requirements for clinicians, and the patient experience is very poor.

[0003] The reasons are as follows:

[0004] 1. When using wax or silicone rubber material to record the occlusal relationship of the upper and lower teeth, it will be affected by different material properties and interference factors such as the displacement of the lower layer of the oral mucosa, excessive saliva, and complex oral structure. Especially when the patient has been edentulous for a long time and the occlusion is irregular. It is difficult for the patient to be in a relatively comfortable position (the bite registration should be a relatively comfortable position for the patient), and more rely on the doctor's experience to repeatedly confirm the accuracy of the bite registration, resulting in inaccurate recording results and low efficiency.

[0005] 2. a. Strong foreign body sensation: After the bite wax is put into the mouth, it will form an obvious foreign body sensation between the teeth and in the mouth. This feeling will make the patient feel that there is something in the mouth hindering normal oral activities such as swallowing and tongue movement, resulting in discomfort or even a slight sense of nausea. b. Long operation time: If the doctor or technician is not proficient in the operation, the process of taking the bite wax may be relatively long, and the patient needs to keep the mouth open and in a specific occlusal state for a long time, which will make the patient feel very uncomfortable and may even cause the patient to accidentally swallow or aspirate. c. Taste and smell interference: The bite wax itself may have some special tastes and odors, which may not be pleasant and will cause certain stimulation to the patient's taste and smell, further affecting the patient experience. Summary of the Invention

[0006] In order to overcome the above technical defects, the present invention provides a construction method for the second-stage digital restoration after implant surgery for edentulous patients, which can improve the patient experience.

[0007] To solve the above problems, the present invention is implemented according to the following technical solutions:

[0008] A construction method for the second-stage digital restoration after implantation for edentulous patients, characterized by comprising the steps of:

[0009] Obtain preoperative occlusal CT images;

[0010] After the operation, install a scanning rod on the composite abutment or implant;

[0011] Obtain postoperative CT images with a scanning rod type and oral scanning data;

[0012] Reconstruct the skull based on the postoperative CT images to obtain a first three-dimensional model;

[0013] Fit the oral scanning data with the first three-dimensional model to obtain a second three-dimensional model;

[0014] Reconstruct the skull based on the preoperative occlusal CT images to obtain a third three-dimensional model;

[0015] Fit the second three-dimensional model with the third three-dimensional model to obtain oral scanning data with correct occlusion;

[0016] Design the later restoration based on the oral scanning data with correct occlusion.

[0017] As a further improvement of the present invention, the occlusal CT images include: occlusal CT images obtained when wearing removable teeth and occlusal CT images obtained when wearing a radiation guide plate.

[0018] As a further improvement of the present invention, when installing the scanning rod, adjust the direction of the scanning rod so that the scanning rods are connected in accordance with the tooth arrangement.

[0019] As a further improvement of the present invention, when reconstructing the skull based on the postoperative CT images to obtain a first three-dimensional model, if the scanning rod and the skull threshold are inconsistent, the scanning rod needs to be readjusted and the first three-dimensional model needs to be reconstructed.

[0020] As a further improvement of the present invention, when fitting the oral scanning data with the first three-dimensional model to obtain a second three-dimensional model, if the data is unqualified, re-obtain the data.

[0021] As a further improvement of the present invention, the present invention further includes the steps of:

[0022] Extract the facial information of the patient according to the preoperative occlusal CT images;

[0023] Based on the facial information, trim out the smile curve.

[0024] As a further improvement of the present invention, the steps of designing the later restoration based on the oral scan data with correct occlusion include:

[0025] Design the later restoration based on the oral scan data with correct occlusion, facial information including the smile curve, and the reference radiological guide plate.

[0026] As a further improvement of the present invention, the steps of designing the later restoration based on the oral scan data with correct occlusion, the smile curve, and the reference radiological guide plate include:

[0027] Fit the oral scan rod to the database to obtain the implant position and the scan rod interface;

[0028] Arrange teeth according to the oral scan data with correct occlusion, the implant position, and the scan rod interface, referring to the facial information and the radiological guide plate;

[0029] Referring to the tooth arrangement, design the metal bracket in combination with the scan rod interface and the gingival information;

[0030] Referring to the tooth arrangement, design the upper crown on the metal bracket.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: The tooth occlusion transfer is more accurate and faster. The accurate occlusion of the patient is determined and saved in a three-dimensional model. Through the scan rod, the second three-dimensional model has similarity with the oral scan data, ensuring the consistency of the skull before and after surgery. The occlusion relationship is integrated. Since the occlusion relationship is transferred, the oral scan data obtains the implant site and the gingival information, and the restoration can be directly designed and processed, reducing the printing steps of the 3D model, shortening the production time, and improving the accuracy of the restoration. Moreover, this method avoids the repeated removal and wearing of accessories in the patient's mouth by the doctor, simplifies the steps, improves the chairside efficiency, and enhances the patient experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The following further describes in detail the specific embodiments of the present invention with reference to the drawings, where:

[0033] Figure 1 is the flowchart of the construction method described in the present invention;

[0034] Figure 2 is the occlusal CT image obtained when wearing the radiological guide plate in the present invention;

[0035] Figure 3 is the perspective view of the scan rod adopted in the present invention;

[0036] Figure 4 is the sectional view of the scan rod adopted in the present invention;

[0037] Figure 5Usage state diagram of the scanning rod adopted by the present invention;

[0038] Figure 6 Image of the first 3D model in the present invention;

[0039] Figure 7 Process diagram of fitting the second 3D model described in the present invention;

[0040] Figure 8 Schematic diagram of the coincidence degree between the oral cavity scanning data (red line in the figure) and the first 3D model of the present invention;

[0041] Figure 9 Another schematic diagram of the coincidence degree between the oral cavity scanning data (blue line in the figure) and the first 3D model of the present invention;

[0042] Figure 10 Image of the oral cavity scanning data when wearing the radiation guide plate described in the present invention;

[0043] Figure 11 Process diagram of fitting the second 3D model and the third 3D model described in the present invention;

[0044] Figure 12 Facial information of the patient extracted from the preoperative occlusal CT image;

[0045] Figure 13 Data diagram after fitting of the present invention;

[0046] Figure 14 Schematic diagram of the steps for arranging teeth with reference to the facial information and the radiation guide plate of the present invention;

[0047] Figure 15 Schematic diagram of the steps for designing the metal bracket described in the present invention;

[0048] Figure 16 Schematic diagram of the steps for designing the upper crown on the metal bracket described in the present invention. Specific embodiments

[0049] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0050] The present invention discloses a construction method for the second-stage digital restoration after implant surgery for edentulous patients, as Figure 1 shown, including the steps:

[0051] S1. Obtain preoperative occlusal CT images; as Figure 2 shown, the occlusal CT images include: occlusal CT images obtained when wearing removable teeth, occlusal CT images obtained when wearing a radiation guide plate, and occlusal CT images of the patient with natural teeth and accurate occlusion.

[0052] S2. After the implant surgery, install a scanning rod on the composite abutment or the implant; when installing the scanning rod, adjust the direction of the scanning rod so that the scanning rods are connected according to the tooth arrangement and are connected into a whole as much as possible. At this time, the tightness between the composite abutment and the scanning rod or the implant and the scanning rod can be checked by taking a CT scan to determine whether the installation is correct.

[0053] Exemplarily, as Figures 3 to 5 shown, the scanning rod adopted by the present invention includes: a scanning rod body 1, a scanning interface 2 and an auxiliary component 3; the scanning interface 2 is arranged through the scanning rod body 1; the scanning rod body 1 includes a gingiva-penetrating component 11 and a positioning component 12 connected to each other; the positioning component 12 is connected to the auxiliary component 3. The first end face of the positioning component 12 is set as a plane, the second end face is connected to the gingiva-penetrating component 11, and the scanning interface 2 includes: a first through hole 21, a second through hole 22 and a third through hole 23 that are connected in sequence. A fourth through hole 24 is also connected between the first through hole 21 and the second through hole 22. In addition, a fourth through hole 24 is also connected between the first through hole 21 and the second through hole 22. The shape of the third through hole 24 is the same as the shape of the composite abutment or the implant, and the auxiliary component 3 is set as a stepped shape.

[0054] A plurality of inclined surfaces 121 are arranged on the side surface of the positioning component 12. The first end face of the positioning component 12 is set as a plane. The first end face and the inclined surface 121 are the positioning surfaces of the scanning rod; the inclined surface 121 is used to identify the direction of the implant, and the first end face is used to position the height of the implant, so as to obtain the three-dimensional position of the implant.

[0055] The first through hole 21 is used for the bolt to pass through, the second through hole 22 is used for positioning the bolt, and its size is equal to or slightly larger than the diameter of the bolt. The shape of the third through hole 23 is the same as the shape of the composite abutment or the implant and is used to contact the composite abutment or the implant.

[0056] S3. Obtain the postoperative CT images and oral scanning data with the scanning rod type. During the whole operation process, it is necessary to keep the position of the scanning rod consistent.

[0057] S4. Reconstruct the skull based on the postoperative CT images to obtain a first three-dimensional model. Since the postoperative CT images already contain the scanning rod, the obtained first three-dimensional model also contains the scanning rod; in order to facilitate observing the images of the oral part in the model, the upper jaw and the lower jaw of the first three-dimensional model need to be separated, as Figure 6 shown.

[0058] When the scanning rod threshold and the skull threshold are inconsistent, reconstruct the first three-dimensional model to obtain the three-dimensional model closest to the real one. Specifically, when extracting the scanning rod and the skull from the postoperative CT images, the scanning rod should be extracted according to the threshold of the scanning rod, and the skull should be extracted according to the threshold of the skull, and then the two data are integrated. There is no fixed threshold for each case. While adjusting the threshold, compare the coincidence degree between the skull and the CT imaging. When the coincidence degree between the skull and the CT is highly coincident, it is okay. The same applies to the scanning rod.

[0059] S5. As Figure 7 shown, fit the oral scanning data with the first three-dimensional model to obtain the second three-dimensional model. Specifically, since the position of the scanning rod does not move when taking the postoperative CT images and performing the oral scanning data, and the scanning rods are the same set of scanning rods, the positions and shapes of the scanning rods on the reconstructed second three-dimensional model are the same as those on the oral scanning data. Fit according to the consistency of the scanning rods. Transfer the spatial position of the oral scanning data to the first three-dimensional model to obtain the second three-dimensional model.

[0060] As Figure 8 and Figure 9 shown, after fitting, the coincidence degree between the oral scanning data and the first three-dimensional model can be seen. In the figure, the scanning rod on the white first three-dimensional model, and the red and blue are the scanning rods on the oral scanning data. The level of the coincidence degree can reflect the accuracy of the oral scanning data, that is, when the scanning rod of the oral scanning data should be highly coincident with the shape of the scanning rod on the first three-dimensional model data, it is qualified. If the non-coincidence is visible to the naked eye, the data is unqualified, thus achieving a role of data inspection. If the oral scanning data and / or the first three-dimensional model is unqualified, the data can be obtained again in time to avoid the upper denture being unqualified due to unqualified data, which will cause the patient to toss around repeatedly, waste clinical time, and waste the materials of the processing factory.

[0061] S6. Reconstruct the skull based on the preoperative occlusal CT images and the oral scanning data when wearing the radiation guide plate to obtain the third three-dimensional model. At this time, the third three-dimensional model has the correct occlusion, as Figure 10 shown.

[0062] S7. As Figure 11As shown, the second 3D model is fitted to the third 3D model to obtain oral scan data with correct occlusion. Specifically, except for the surgical area, the skull at other positions remains unchanged. Using the consistency of the skull at other positions, the second 3D model is fitted to the third 3D model. The spatial positions of the upper and lower jaws of the second 3D model are respectively transferred to the spatial positions of the third 3D model with preoperative occlusion. At the same time, since the spatial position of the oral scan data is consistent with that of the third 3D model (already fitted before), the software can be used to move the spatial position of the oral scan data to the third 3D model following the second 3D model. At this time, the spatial positions of the second 3D model and the oral scan data have been transferred to the third 3D model (with correct occlusion), that is, oral scan data with correct occlusion is obtained.

[0063] The radiation guide plate and the occlusal CT image obtained when wearing the radiation guide plate also have common points (development marking points), and the radiation guide plate can be transferred to the spatial position of the third 3D model and used as a reference for the subsequent prosthetic design.

[0064] S8, as Figure 12 shown, extract the facial information of the patient according to the preoperative occlusal CT image; on the basis of the facial information, trim out the smile curve.

[0065] S9. Based on the oral scan data with correct occlusion, the facial information including the smile curve, and the reference radiation guide plate, design the later repair, which specifically includes the following steps:

[0066] S91, as Figure 13 shown, according to the database, obtain the information of the implant position and the scanning rod, such as the position, shape, and related parameters of the scanning rod interface. In Figure 13 it, the yellow part on the left is the scanning rod in the database, and the light blue part on the right is the implant substitute.

[0067] The database contains the external shapes and relative position information of a single scanning rod, a scanning rod interface, a composite abutment, and an implant. After the scanning rod is fitted to the scanning rod on the oral scan data, the parameter information such as the position, shape, and the position of the scanning rod interface, composite abutment, and implant corresponding to the implant site can be obtained.

[0068] S92, as Figure 14 shown, according to the oral scan data with correct occlusion, the implant position and the scanning rod interface, and referring to the facial information and the radiation guide plate, arrange the teeth. Considering that the radiation guide plate already contains the information of tooth arrangement, if the patient and the doctor think that the tooth arrangement is okay, the teeth can be arranged according to this information. If there are problems, the teeth can be arranged referring to the radiation guide plate according to the requirements of the doctor or the patient.

[0069] S93. Referring to the tooth arrangement, combining the scanning rod interface and the gingival information, as Figure 15 shown, design the metal bracket.

[0070] S94. Refer to tooth arrangement, and design the upper crown on the metal bracket as shown in Figure 16 .

[0071] After the above design, output the design files of the metal bracket and the upper crown. The design files contain the processable stl files of the metal bracket and the upper crown. Cut the metal bracket and the upper crown, or print them through printing technology, and then perform simple grinding, polishing, and glazing. This step can be implemented by different processes according to the actual situation of the case and the processing method of the material.

[0072] Through the above steps, the following technical effects can be achieved:

[0073] 1. The tooth occlusion transfer is more accurate and faster. Determine the accurate occlusion of the patient and save it with a three-dimensional model. Through the scanning rod, the second three-dimensional model has similarity with the oral scan data, ensuring the consistency of the skull before and after the operation, and integrating the occlusion relationship.

[0074] 2. Because the occlusion relationship is transferred, the oral scan data obtains the implant site and gingival information, and the restoration can be directly designed and processed, reducing the printing steps of the 3D model, shortening the production time, and improving the accuracy of the restoration. Moreover, this method avoids the repeated removal and wearing of accessories in the patient's mouth by the doctor, simplifies the steps, improves the chairside efficiency, and improves the patient's experience.

[0075] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Therefore, any modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A construction method for the second-stage digital restoration after implantation for edentulous patients without jaws, characterized in that Including the steps: Obtain preoperative occlusal CT images; After dental implantation, install a scanning rod on the composite abutment or implant; Obtain postoperative CT images with a scanning rod and oral scanning data; Reconstruct the skull based on the postoperative CT images to obtain a first three-dimensional model; Fit the oral scanning data with the first three-dimensional model to obtain a second three-dimensional model; Reconstruct the skull based on the preoperative occlusal CT images to obtain a third three-dimensional model; Fit the second three-dimensional model with the third three-dimensional model to obtain oral scanning data with correct occlusion; Based on the oral scanning data with correct occlusion, design the later restoration; 2. The construction method according to claim 1, characterized in that, The occlusal CT images include: occlusal CT images obtained when wearing removable teeth, occlusal CT images obtained when wearing a radiographic guide plate, and occlusal CT images of the patient with natural teeth and accurate occlusion; 3. The construction method according to claim 1, characterized in that When installing the scanning rod, adjust the direction of the scanning rod so that the scanning rods are connected according to the tooth arrangement; 4. The construction method according to claim 1, wherein When reconstructing the skull based on the postoperative CT images to obtain a first three-dimensional model, if the scanning rod threshold and the skull threshold are inconsistent, reconstruct the first three-dimensional model; 5. The construction method according to claim 1, wherein When fitting the oral scanning data with the first three-dimensional model to obtain a second three-dimensional model, if the oral scanning data and / or the first three-dimensional model are unqualified, re-obtain the data; 6. The construction method according to claim 1, wherein It also includes the steps: Extract the facial information of the patient based on the preoperative occlusal CT images; On the basis of the facial information, trim out the smile curve; 7. The construction method according to claim 6, wherein The step of designing the later restoration based on the oral scanning data with correct occlusion includes: Design the later restoration based on the oral scanning data with correct occlusion, facial information including the smile curve, and a reference radiographic guide plate; 8. The construction method according to claim 7, characterized in that The step of designing the later restoration based on the oral scanning data with correct occlusion, the smile curve, and the reference radiographic guide plate includes: Obtain the information of the implant position and the scanning rod according to the database; According to the oral scanning data with correct occlusion, the implant position, and the scanning rod interface, arrange the teeth with reference to the facial information and the radiographic guide plate; With reference to the tooth arrangement, design a metal bracket in combination with the scanning rod interface and the gingival information; With reference to the tooth arrangement, design the upper crown on the metal bracket;

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