A method for multi-unit implant abutment transfer and precise impression taking

Abstract

The patent of this invention relates to the application field of oral technology, and in particular to a method for transferring and accurately taking impressions of multi-unit implant abutments; it includes the steps of installing implant substitutes on implants and making models, selecting composite abutments, scanning abutment position relationships, modeling and designing, and making personalized transfer rods; it combines three-dimensional digital acquisition technology with digital design and production technology, and the device has a simple structure and is easy to operate. It can simulate the selection and fix the orientation of the composite abutment outside the oral cavity, making it convenient for later physicians to quickly install the composite abutment in the oral cavity according to the position and direction simulated on the model and to achieve accurate horizontal impressions of the multi-unit implant abutments.

Description

Technical Field

[0001] This invention patent relates to the field of oral technology applications, and particularly to methods for multi-unit implant abutment transfer and precise impression taking. Background Art

[0002] Oral implants, also known as dental implants, are surgically implanted into the upper and lower jaws of the human body at the tooth-deficient sites. After the surgical wound heals, a device for installing a prosthetic denture is mounted on its upper part; the upper prosthetic restoration of the implant can be divided into adhesive retention and screw retention according to different retention forms. Due to the convenience of later maintenance and the absence of problems such as adhesive residue in the screw retention restoration method, which can cause peri-implantitis and other advantages, more and more clinicians choose to adopt the screw retention implant restoration plan; at the same time, with the continuous progress of edentulous implant technology, more and more edentulous patients choose implant restoration solutions, and the upper prosthetic restoration of edentulous patients mostly uses screw retention implant bridges.

[0003] However, to ensure that the screw retention implant bridge can be passively seated on the implant, there are relatively high requirements for the implanting angle of the implant. Usually, it is required that the implanting angles of the implants are relatively parallel; in the actual implanting process, the implanted implants cannot be completely parallel. Therefore, a composite abutment is needed to correct the seating direction of the screw retention implant bridge. Since the operation of selecting a composite abutment in the mouth is not intuitive and convenient enough, doctors usually take an implant-level impression and then select a composite abutment on the poured plaster model and determine the seating direction of the composite abutment. However, if a non-anti-rotation angle composite abutment is selected (anti-rotation and non-anti-rotation, among which the non-anti-rotation composite abutment can adjust the implant angle more widely), it is impossible to accurately transfer the simulated seating position on the model to the mouth.

[0004] In addition, the key to successful implant restoration is to obtain an accurate impression. When performing restoration impression taking for multi-tooth implantations, to maintain the stability of multiple implant impression transfer rods and thus obtain accurate implant position relationships, it is often necessary to rigidly connect the implant impression transfer rods in various ways before taking the impression. However, the traditional method is cumbersome and time-consuming during the rigid connection process, and the long operation time in the patient's mouth is likely to cause discomfort to the patient. Summary of the Invention

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by this invention patent is to accurately transfer a composite abutment (especially a non-anti-rotation angle composite abutment) to the oral implant after selecting and determining its position by an indirect method and complete the final multi-tooth implant abutment level precise impression taking method and device; it can directly, quickly, conveniently and accurately complete the seating of the composite abutment in the mouth according to the simulated direction and position, and complete the precise impression taking of the multi-unit implant abutment level.

[0006] To achieve the above object, a method for multi-unit implant abutment transfer and precise impression taking provided by the present invention for a patent for invention is characterized by comprising the following steps:

[0007] 1. After the doctor takes an implant-level impression, install an implant analog, mix high-strength dental stone after pouring artificial gingiva, and complete the pouring of the dental stone model;

[0008] 2. On the model, according to the implant position and direction, taking into account the dentition arrangement, opening position, and common insertion path of the final restoration, select a suitable composite abutment. That is, if the anti-rotation angular composite abutment cannot meet the restoration requirements, select a non-anti-rotation angular composite abutment, position the composite abutment on the model in the correct direction, and fix the composite abutment to the model implant analog with a central screw; 3. Install a digital scanning bar on the composite abutment of the model and fasten the digital scanning bar to the composite abutment with a screw;

[0009] 4. Use a model scanner to scan to obtain the three-dimensional point cloud data of each digital scanning bar and the three-dimensional point cloud data of the oral tissues around the digital scanning bar;

[0010] 5) Use the supporting software to edit and model the point cloud data obtained in step 4, complete the design of the personalized transfer bar, and finally manufacture the personalized transfer bar by CNC machining;

[0011] 6. Assemble the processed personalized transfer bar with the composite abutment on the model, loosen the central screw, remove the personalized transfer bar together with the connected composite abutment, and deliver it to the clinic for implant impression taking;

[0012] 7. In the oral cavity, position the personalized transfer bar together with the composite abutment in sequence according to the positioning order on the model, adjust the positioning direction of the composite abutment so that the connecting rod end face of the personalized transfer bar connected above it is flush with the connecting rod end face of the adjacent personalized transfer bar, and fix the central screw to the torque value recommended by the implant manufacturer; complete the positioning of the composite abutment in the same way in sequence;

[0013] 8. After the composite abutment is properly positioned, use rapid prototyping resin to connect the connecting end faces of two adjacent personalized transfer bars into a whole;

[0014] 9. Select a suitable tray, inject impression material into the tray, position it in the oral cavity, wait for the impression material to solidify, first unscrew the central screw from the composite abutment, and then remove the personalized transfer bar and the tray as a whole to complete impression taking.

[0015] Further, the modeling method in step 5 includes:

[0016] 1. Match and fuse the acquired 3D point cloud data of several digital scanning rods with the software scanning rod database to generate a digital model at the implant abutment level; build a personalized transfer rod, the interface of which matches the abutment connection of the composite abutment; extend the body of the personalized transfer rod along the long axis of the composite abutment, with a body length of 7-9mm and an outer wall thickness of 0.5-1mm;

[0017] 2. Deflect the body of the personalized transfer rod 17° or 30° along the long axis to design a central screw channel. The size of the central screw channel ensures that the central screw of the composite abutment can pass through.

[0018] 3. Design a deep concave retention part on the shaft wall of the body of the personalized transfer rod;

[0019] 4. The upper part of the shaft wall of the personalized transfer rod is 2-4mm away from the upper edge of the interface, and a 1.5-2mm diameter connecting rod is designed to avoid the central screw channel. The shape of the connecting rod is consistent with the curvature of the dental arch;

[0020] 5. Design the connecting rods of two adjacent personalized transfer rods to be connected in cross section at the center;

[0021] 6. Complete the personalized transfer rod design and modeling, and then complete the CNC cutting and production.

[0022] The aforementioned device used in the method for transferring and accurately taking impressions of multiple-unit implant bases includes a personalized transfer rod; the personalized transfer rod includes a positioning transfer rod, a central screw and a connecting rod; the connecting rod is arranged on the side of the positioning transfer rod; the positioning transfer rod includes a body, an interface, a central screw channel and a central screw channel, the lower part of the body is a hollow interface, and the inner diameter of the interface matches the outer diameter of the base connecting part of the composite base; a central screw channel is opened on one side of the interface, and the central screw channel matches the central screw channel of the composite base; the central screw channel matches the repair screw channel of the composite base; the personalized transfer rod is connected and fixed to the composite base by tightening the central screw; the composite base is connected and fixed to the implant or implant replacement by tightening the central screw.

[0023] Furthermore, a deep groove retaining portion is provided on the side of the body.

[0024] The beneficial effects of the present invention are:

[0025] 1. The device has a simple structure and is easy to operate. It can simulate the selection of the composite abutment placement direction outside the oral cavity, which is convenient for the physician to quickly install it in the oral cavity later;

[0026] 2. The present invention provides a method and device for transferring and accurately taking impressions of a multi-unit implant abutment. The impression taking method combines three-dimensional digital acquisition technology, digital design and production technology, and can accurately, quickly and efficiently complete the installation of a composite abutment (especially a non-rotation angle composite abutment) in the mouth and the impression taking of the multi-unit implant abutment level. At the same time, this method is also suitable for young doctors and doctors in grassroots dental hospitals and clinics, which increases the popularization of the correct selection, placement and accurate impression taking technology of multi-unit implant composite abutments.

[0027] 3. This method solves the problem of unsatisfactory implant orientation during implant restoration, which requires the selection of a composite abutment (especially a non-rotational composite abutment) to adjust the positioning path. The position and orientation of the composite abutment simulated outside the mouth can be quickly and accurately installed on the intraoral implant, and precise horizontal molding of multi-unit implant abutments can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the installation position relationship of the patented personalized transfer rod of the present invention.

[0029] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A.

[0030] Figure 3 It is a schematic diagram of the external structure of the patented personalized transfer rod of the present invention.

[0031] Figure 4 It is a schematic diagram of the position structure of the digital scanning rod and the implant replacement.

[0032] Figure 5 It is a schematic diagram of the positional relationship between adjacent connecting rods and positioning transfer rods. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited by the specific implementation disclosed below.

[0034] The following is combined with Figures 1-5 The present invention is further described in the following embodiments: A method for transferring and accurately taking impressions of a multi-unit implant abutment comprises the following steps:

[0035] 1) After the doctor takes the implant-level impression (since the doctor implants implants in the patient's oral cavity, and the implants vary from person to person and the implant directions are also very different. Therefore, a model simulating the implant position relationship in the oral cavity is made through the implant-level impression process), install the implant analog 1 (in the real oral cavity, high-cost metal / other implants are implanted, but here we only need to utilize the position relationship of the implants. Therefore, an implant substitute 1 with the same position relationship as the actual implants in the oral cavity is installed on the model), mix super-hard gypsum after pouring artificial gums, and complete the pouring of the gypsum model;

[0036] 2) On the model, according to the implant position and direction, after considering the dentition arrangement, opening position, and common insertion path of the final restoration (which can be briefly described as the technician arranges / selects a better dentition position relationship according to the actual situation in the patient's oral cavity), select a suitable composite abutment 2. If the anti-rotation angle composite abutment cannot meet the requirements of the restoration, then select a non-anti-rotation angle composite abutment (if the ready-made composite abutment still cannot meet the requirements, then consideration can be given to making a personalized composite abutment by CAD / CAM method). Position the composite abutment on the model in the correct direction and fix the composite abutment to the implant analog 1 on the model through the central screw 415;

[0037] 3) Install the digital scanning bar 3 on the composite abutment 2 of the model and fasten the digital scanning bar 3 to the composite abutment 2 through the screw 31;

[0038] 4) Use the model scanner to scan to obtain the three-dimensional point cloud data of each digital scanning bar 3 and the three-dimensional point cloud data of the oral soft and hard tissues around the digital scanning bar 3;

[0039] 5) Use the supporting software to edit and model the point cloud data obtained in step 4, complete the design of the personalized transfer bar 4, and finally manufacture the personalized transfer bar 4 through CNC numerical control machining;

[0040] 6) Assemble the processed personalized transfer bar 4 with the composite abutment 2 on the model. By loosening the central screw 415, remove the personalized transfer bar 4 together with the connected composite abutment 2 and deliver it to the clinic for taking the implant impression;

[0041] 7) In the oral cavity, position the personalized transfer bar 4 together with the composite abutment 2 in the order of positioning on the model in sequence, adjust the positioning direction of the composite abutment 2 so that the end face of the connecting rod 43 of the personalized transfer bar connected above it is aligned with the end face of the connecting rod of the adjacent personalized transfer bar, and fix the central screw 415 to the torque value recommended by the implant manufacturer; Complete the positioning of the composite abutment 2 in the same way in sequence;

[0042] 8) After the composite abutment 2 is properly positioned, use rapid prototyping resin to connect the end faces of the connecting ends 43 of two adjacent personalized transfer bars into a whole;

[0043] 9) Select a suitable tray, inject impression material into the tray, position it in the mouth, and wait for the impression material to solidify. First, unscrew the central screw 42 from the composite abutment 2, and then remove the personalized transfer bar 4 and the tray as a whole to complete the impression taking.

[0044] The modeling method in the above-mentioned 5) includes:

[0045] 2.1 Match and fuse the 3D point cloud data of several obtained digital scanning bars 3 with the software scanning bar database to generate a digital model at the implant abutment level; model the personalized transfer bar, and the interface part 412 of the personalized transfer bar matches the abutment connecting part 221 of the composite abutment 2; extend the body part 411 of the personalized transfer bar along the long axis of the composite abutment, the length of the body part is 7 - 9 mm, and the outer wall thickness is 0.5 - 1 mm; the length and thickness here are only recommended thicknesses and can be adjusted according to actual needs;

[0046] 2.2 Design the central screw channel 414 along the direction where the body part 411 of the personalized transfer bar deflects 17° or 30° (the angle between the angled abutment / composite abutment) along the long axis, and the deflection angle is consistent with the angle of the selected composite abutment. The size of the central screw channel 414 ensures that the central screw 415 of the composite abutment 2 can pass through;

[0047] 2.3 Design a deep concave retention part on the axial wall of the body part 411 of the personalized transfer bar;

[0048] 2.4 Above the axial wall of the body part 411 of the personalized transfer bar, 2 - 4 mm away from the upper edge of the interface part (412) (this distance is recommended based on practical experience), avoid the central screw channel 414 and design a connecting rod 43 with a diameter of 1.5 - 2 mm (the recommended distance range in practice). The shape of the connecting rod 43 is consistent with the dental arch curvature;

[0049] 2.5 Design the connecting rods 43 of two adjacent personalized transfer bars 4 to be butt - jointed at the center in terms of cross - section;

[0050] 2.6 Complete the modeling of the personalized transfer bar 4, and then deliver it for CNC cutting and numerical control machining.

[0051] In actual production and processing design, a personalized transfer rod; the personalized transfer rod includes a positioning transfer rod 41, a central screw 42 and a connecting rod 43; the connecting rod 43 is arranged on the side of the positioning transfer rod 41; the positioning transfer rod 41 includes a body portion 411, an interface portion 412, a central screw channel 413 and a fastening screw channel 414. The lower part of the body portion 411 is a hollow interface portion 412, and the inner diameter of the interface portion 412 matches the outer diameter of the abutment connecting portion 221 of the composite abutment 22; a central screw channel 414 is provided on one side of the interface portion 412, and the central screw channel 414 matches the central screw channel 224 of the composite abutment; the central screw channel 413 matches the repair screw channel 222 of the composite abutment. By tightening the central screw 42, the personalized transfer rod 4 is connected and fixed to the composite abutment 22; by tightening the central screw 415, the composite abutment 22 is connected and fixed to the implant or implant substitute.

[0052] Specifically, a deep groove retention portion 44 is provided on the side of the body portion 41 to increase the mechanical combination of the transfer rod and the impression material.

[0053] In practical applications, first, implants are implanted in the patient's oral cavity. When implanting the implants, the direction of the implants will inevitably deviate, which will cause the screw-retained prosthesis supported by multiple implants to not obtain a common insertion path. At this time, it is necessary to select a composite abutment to adjust the insertion direction of the implant. In some cases, selecting a straight composite abutment may not be able to obtain a common insertion path on the one hand, and on the other hand, it may also cause the final dental crown not to form a neat dental arch or the position of the opening to affect the aesthetics. Therefore, an angled composite abutment is required; however, how to select a composite abutment with a suitable gingival penetration angle, especially when multiple implants need to be performed, it may be relatively difficult and cumbersome for the doctor to rotate the composite abutment in the patient's oral cavity to find a suitable correction position due to factors such as the operation field of view; therefore, in this application, an in vitro mold is made, and then the technician selects on the model, selects a suitable composite abutment and a suitable insertion direction; after installing a matching scanning rod, a model scanner is used to obtain three-dimensional point cloud data and a personalized transfer rod is designed through design software modeling; then numerical control cutting processing is used to complete the numerical control cutting processing of the personalized transfer rod; the personalized transfer rod is successively seated on the composite abutment of the model, then the central screw is loosened, the personalized transfer rod is removed together with the composite abutment, and numbered in sequence (for easy distinction), and the selection of the composite abutment is completed and delivered to the clinic; during clinical use, the seating devices are successively installed in sequence according to the numbers, and their directions are adjusted so that the cross-sections of the connecting rods 43 of two adjacent seating devices are anastomosed, and then the central screw 415 is tightened to complete the accurate seating of the composite abutment. Then the central screw 42 is loosened, and the composite abutment is loaded according to the recommendations of the implant manufacturer to complete the full seating of the composite abutment. Thus, the entire insertion path is selected outside the oral cavity and quickly installed inside the oral cavity; the advantages of selecting outside the oral cavity and quickly installing inside the oral cavity are realized. In addition, when this application is for the transfer of multi-unit implant abutments, it can accurately, quickly and efficiently complete the installation and seating of non-anti-rotation composite abutments in the oral cavity through the auxiliary judgment of the cross-sections of adjacent connecting rods 43.

[0054] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A method for multi-unit implant abutment transfer and precise impression taking, characterized in that, It includes the following steps: 1) After the doctor makes an implant-level impression, install the implant analog (1), pour artificial gingiva, and then mix high-strength dental stone to complete the pouring of the dental stone model. 2) On the model, according to the implant position and direction, while considering the dentition arrangement, opening position, and common insertion path of the final restoration, select a suitable composite abutment (2), position the composite abutment on the model in the correct direction, and fix the composite abutment to the implant analog (1) on the model through the central screw (415). 3) Install the digital scanning bar (3) on the composite abutment (2) of the model, and fasten the digital scanning bar (3) to the composite abutment (2) through the screw (31). 4) Use a model scanner to scan to obtain the three-dimensional point cloud data of each digital scanning bar (3) and the three-dimensional point cloud data of the oral soft and hard tissues around the digital scanning bar (3). 5) Use the supporting software to edit and model the point cloud data obtained in step 4), complete the design of the personalized transfer bar (4), and finally manufacture the personalized transfer bar (4) through CNC machining. 6) Assemble the processed personalized transfer bar (4) with the composite abutment (2) on the model. By loosening the central screw (415), remove the personalized transfer bar (4) together with the connected composite abutment (2) and deliver it to the clinic for the seating of the composite abutment and the making of the implant-level impression. 7) In the oral cavity, seat the personalized transfer bar (4) together with the composite abutment (2) in the order of seating on the model, adjust the seating direction of the composite abutment (2) so that the end face of the connecting rod (43) of the personalized transfer bar connected above it is aligned with the end face of the connecting rod of the adjacent personalized transfer bar, and fix the central screw (415) to the torque value recommended by the implant manufacturer; complete the seating of the composite abutment (2) in the same way in sequence. 8) After the composite abutment (2) is seated, use rapid prototyping resin to connect the end faces of the connecting rods (43) of two adjacent personalized transfer bars into a whole. 9) Select a suitable tray, inject impression material into the tray, seat it in the oral cavity, wait for the impression material to solidify, first unscrew the central screw (42) from the composite abutment (2), and then remove the personalized transfer bar (4) and the tray as a whole to complete the impression taking.

2. The method for multi-unit implant abutment transfer and precise impression taking according to claim 1, wherein, The modeling method in step (5) includes: 2.1 Match and fuse the obtained three-dimensional point cloud data of several digital scanning bars (3) with the software scanning bar database to generate a digital model at the implant abutment level; model the personalized transfer bar, and the interface part (412) of the personalized transfer bar matches the abutment connecting part (221) of the composite abutment (2); extend the body part (411) of the personalized transfer bar along the long axis of the composite abutment, the length of the body part is 7 - 9 mm, and the outer wall thickness is 0.5 - 1 mm. 2.2 Design a central screw channel (414) in the body part (411) of the personalized transfer bar along the long axis deflected by 17° or 30° direction, and the size of the central screw channel (414) ensures that the central screw (415) of the composite abutment (2) can pass through. 2.3 Design a deep concave retention part on the axial wall of the body part (411) of the personalized transfer bar. 2.4 The upper side of the shaft wall of the body (411) of the personalized transfer rod is 2-4 mm away from the upper edge of the interface (412), and a connecting rod (43) with a diameter of 1.5-2 mm is designed to avoid the central screw channel (414), and the shape of the connecting rod (43) is consistent with the curvature of the dental arch; 2.5 Design the connecting rods (43) of two adjacent personalized transfer rods (4) to be connected in cross section at the center; 2.6 Complete the modeling of the personalized transfer rod (4), and then deliver and complete the CNC cutting production.

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