Metallic bracket removable partial denture digital design and manufacturing method

Abstract

The application relates to the technical field of denture manufacturing, and discloses a metal support removable partial denture digital design and manufacturing method. The manufacturing method comprises the following steps: scanning three-dimensional data of a patient's intraoral dentition to obtain an initial dentition model and determine a design scheme of a metal support; scanning three-dimensional information data of the intraoral dentition after abutment preparation to obtain a post-abutment preparation dentition model; designing the metal support according to the post-abutment preparation dentition model, and performing physiological adjustment on the metal support to obtain a metal support model with an assembly structure; obtaining a metal support-residual tooth model and a free end mucosa-residual tooth model according to the metal support model, and registering the two models with the post-abutment preparation dentition model to obtain a free end mucosa-metal support actual position model; and designing and manufacturing artificial teeth and a base according to the free end mucosa-metal support actual position model. The manufacturing method can reduce the complex process in the traditional removable denture manufacturing method, and improve the manufacturing precision and stability of the prosthesis.

Description

Technical Field

[0001] This invention relates to the field of denture fabrication technology, and proposes a digital design and fabrication method for removable partial dentures with metal frameworks. Background Technology

[0002] Removable partial dentures, commonly known as dentures, are a common type of dental prosthesis used to restore missing teeth. The traditional manufacturing process involves first fabricating a metal framework on a model, then fixing resin artificial teeth to the missing tooth site with wax and creating a wax model of the denture base. Finally, the resin base is fabricated by filling a mold with wax and then connecting the metal framework and artificial teeth to obtain the final denture. This traditional method is time-consuming and affects the restorative effect and the health of remaining soft and hard tissues in the mouth. The development and application of digital technology have greatly improved the fabrication level of removable partial dentures. However, existing digitally designed removable partial dentures have complex structures and cumbersome manufacturing processes, increasing the workload of design and fabrication, making it difficult to guarantee the precision of denture fabrication, and thus failing to meet actual clinical needs. Summary of the Invention

[0003] This invention provides a digital design and fabrication method for removable partial dentures with metal frameworks, which effectively realizes the acquisition of digital physiological adjustment and digital correction models of the metal framework. It can reduce the complex procedures in traditional removable denture fabrication methods, improve the accuracy and stability of prosthesis fabrication, reduce the number of follow-up visits and treatment time for patients, and improve the clinical work efficiency of doctors.

[0004] This invention provides a digital design and fabrication method for metal-framed removable partial dentures, comprising:

[0005] Scan the patient's intraoral dentition three-dimensional data to obtain an initial dentition model;

[0006] The initial dentition model is observed to determine the design scheme of the metal framework; according to the design scheme, the abutment teeth are prepared in the patient's mouth and then the three-dimensional information data of the dentition in the mouth are scanned to obtain the dentition model after tooth preparation.

[0007] Based on the prepared dentition model, the metal framework of the removable denture is designed. The denture insertion direction is determined in the design software and the undercuts of soft and hard tissues are observed. The rests, connectors, proximal panels, retainers, and base connectors are designed. According to the position of the artificial teeth to be arranged, the assembly structure is set at the corresponding part of the base connector. The physiological adjustment of the morphology of the metal framework is carried out with the rest line on the abutment near the dentition tooth as the axis of rotation, so as to obtain a metal framework model with assembly structure.

[0008] Based on the metal framework model, a metal framework is fabricated and the actual positional relationship between the metal framework and the remaining tooth is obtained to obtain the metal framework-remaining tooth model.

[0009] The accurate morphology of the mucosa in the edentulous area and the actual positional relationship between the mucosa in the edentulous area and the remaining teeth and metal framework are obtained to obtain the free end mucosa-remaining tooth model;

[0010] The metal framework-remaining tooth model and the free end mucosa-remaining tooth model were registered with the dentition model after tooth preparation using software, so that the positional relationship between the metal framework, the remaining tooth, and the free end mucosa was consistent with the actual positional relationship in the patient's mouth, thus obtaining the actual positional model of the free end mucosa-metal framework.

[0011] Based on the actual position model of the free end mucosa-metal framework, the base design, artificial tooth design, and assembly structure design were carried out using software, resulting in a base model with assembly structure and an artificial tooth model with assembly structure.

[0012] Artificial teeth and bases are fabricated according to the base model and the artificial tooth model, respectively; the artificial teeth and the bases are assembled onto the metal bracket through the assembly structure.

[0013] According to the present invention, a method for digital design and fabrication of a removable partial denture with a metal framework includes the following steps: obtaining the accurate morphology of the edentulous area mucosa and the actual positional relationship between the edentulous area mucosa, the remaining teeth, and the metal framework.

[0014] Based on the initial dentition model and the dentition model after tooth preparation, an impression base plate for taking impressions is designed, the impression base plate is printed, and the impression base plate is fixed to the metal support; the edges of the impression base plate are functionally shaped using heavy silicone rubber material, and the occlusal relationship is recorded on the occlusal surface of the impression base plate using silicone rubber material; a light silicone rubber material is placed on the tissue surface of the impression base plate to obtain a fine impression of the free end of the mucosa in the free end defect area.

[0015] Intraoral scanning was used to obtain the positional relationship between the free end fine impression and the remaining tooth, resulting in a free end impression-remaining tooth model;

[0016] Remove the metal framework, scan the edentulous area outside the mouth, obtain complete morphological data of the free end mucosa, and obtain a free end impression model;

[0017] The free end impression model is registered with the free end impression-remaining tooth model to obtain the actual positional relationship between the mucosa and the remaining tooth at the site of tooth loss, thus obtaining the free end mucosa-remaining tooth model.

[0018] According to the present invention, a digital design and fabrication method for a removable partial denture with a metal framework is provided, wherein the distance between the impression substrate and the tissue surface of the initial dental arch model is greater than 1 mm.

[0019] According to the present invention, a digital design and fabrication method for a removable partial denture with a metal frame is provided, wherein the impression substrate and the metal frame are connected by a fluid resin.

[0020] According to the present invention, a digital design and fabrication method for a removable partial denture with a metal framework includes the step of fabricating the artificial tooth and the denture base based on the denture base model and the artificial tooth model, respectively, comprising:

[0021] The denture base model and the artificial tooth model are 3D printed to obtain the artificial tooth and the denture base;

[0022] Alternatively, the resin material can be cut according to the base model and the artificial tooth model to obtain the artificial tooth and the base.

[0023] According to the present invention, a digital design and fabrication method for a removable partial denture with a metal framework, after the step of fabricating the artificial tooth and the denture base respectively based on the denture base model and the artificial tooth model, the method further includes:

[0024] The artificial teeth and the base are respectively ground and polished.

[0025] According to the present invention, a digital design and fabrication method for a removable partial denture with a metal framework includes the step of fabricating the metal framework based on the metal framework model and obtaining the actual positional relationship between the metal framework and the remaining teeth, comprising:

[0026] The metal bracket model is 3D printed to obtain the metal bracket;

[0027] The position of the metal framework in the patient's mouth is adjusted, and an intraoral scan is performed after confirming that the fitting is suitable to obtain the actual positional relationship between the metal framework and the remaining tooth, thus obtaining a metal framework-remaining tooth model.

[0028] According to the present invention, a method for digitally designing and manufacturing a removable partial denture with a metal framework, after the step of 3D printing the metal framework model, further includes:

[0029] The metal bracket is subjected to grinding, polishing, and heat treatment in sequence.

[0030] According to the present invention, a digital design and fabrication method for a metal-framed removable partial denture is provided, wherein both the artificial tooth and the base are made of resin.

[0031] According to the present invention, a digital design and fabrication method for a removable partial denture with a metal framework is provided, wherein the artificial tooth and the base are both bonded to the metal framework with resin adhesive.

[0032] The above-described one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0033] According to the embodiment of the present invention, the method for digital design and fabrication of removable partial dentures with metal frameworks involves physiologically adjusting the shape of the metal framework by using the abutment line on the abutment near the edentulous tooth as the axis of rotation during the metal framework design process. This allows for the grinding of areas of excessive contact between the metal framework and the remaining tooth, enabling the metal framework to rotate freely to a certain extent. Simultaneously, it efficiently and accurately obtains a metal framework that fits the patient's dentition model after tooth preparation. By registering the metal framework-remaining tooth model and the free end mucosa-remaining tooth model with the dentition model after tooth preparation, the positional relationship between the metal framework, remaining tooth, and free end mucosa is kept consistent with their actual positional relationship in the patient's mouth. This yields a digitally corrected model and ensures that the tissue surfaces of the final restoration's metal framework and resin base can simultaneously maintain close contact with the patient's teeth and the edentulous area mucosa, thereby improving the fabrication accuracy and stability of the restoration. The present invention provides a digital design and fabrication method for removable partial dentures with metal frameworks. By using software, the method realizes the acquisition of digital physiological adjustment and digital correction models of the digital metal framework. This method can reduce the complex procedures in traditional removable denture fabrication methods, improve the accuracy and stability of prosthesis fabrication, reduce the number of follow-up visits and treatment time for patients, and improve clinical work efficiency.

[0034] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a flowchart of the digital design and fabrication method for metal-framed removable partial dentures provided in this embodiment of the invention;

[0037] Figure 2 This is a schematic diagram of the digital model of the initial dental arch model provided in an embodiment of the present invention;

[0038] Figure 3 This is a top-view digital model schematic diagram of the metal bracket model with assembly structure provided in the embodiment of the present invention;

[0039] Figure 4 This is a bottom-view digital model diagram of the metal bracket model with assembly structure provided in an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the digital model of the actual positional relationship between the metal support and the remaining tooth provided in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the connection relationship between the printing plate and the metal support provided in an embodiment of the present invention;

[0042] Figure 7 This is a top-view digital model diagram of the artificial tooth model with assembly structure provided in an embodiment of the present invention;

[0043] Figure 8 This is a schematic diagram of a bottom-view digital model of an artificial tooth model with an assembly structure provided in an embodiment of the present invention;

[0044] Figure 9 This is a top-view digital model diagram of the base model with assembly structure provided in an embodiment of the present invention;

[0045] Figure 10 This is a schematic diagram of a bottom-view digital model of a base model with an assembly structure provided in an embodiment of the present invention;

[0046] Figure 11 This is a schematic diagram of the assembly relationship between the artificial tooth, the metal framework, and the base provided in an embodiment of the present invention;

[0047] Figure 12 This is a schematic diagram of a digital model of a denture after it has been worn, as provided in an embodiment of the present invention.

[0048] Figure label:

[0049] 10. Metal frame; 11. Support; 12. Connector; 13. Adjacent panel; 14. Retainer; 15. Base connector; 20. Remaining tooth; 30. Free end mucosa; 40. Impression base plate; 50. Artificial tooth; 60. Base; 70. Assembly structure. Detailed Implementation

[0050] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0051] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0053] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0055] Figure 1 A flowchart illustrating the digital design and fabrication method for metal-framed removable partial dentures provided in an embodiment of the present invention is shown. Figure 2A schematic diagram of the digital model of the initial dentition model provided in an embodiment of the present invention is illustrated. Figure 3 A top-view digital model diagram of a metal bracket model with an assembly structure provided in an embodiment of the present invention is illustrated. Figure 4 A schematic diagram of a bottom-view digital model of a metal bracket model with an assembly structure provided in an embodiment of the present invention is shown, as follows: Figures 1 to 4 As shown, the digital design and fabrication method for metal-framed removable partial dentures includes the following steps:

[0056] Step 100: Scan the three-dimensional data of the patient's intraoral dentition to obtain an initial dentition model.

[0057] like Figure 2 As shown, when a patient visits for the first time, an intraoral scanner is used to scan the patient's mouth to obtain three-dimensional data of the patient's dental arch and obtain an initial dental arch model.

[0058] Step 200: Observe the initial dentition model to determine the design scheme of the metal framework 10; according to the design scheme, prepare the abutment teeth in the patient's mouth and scan the three-dimensional information data of the dentition in the mouth to obtain the dentition model after tooth preparation.

[0059] In this embodiment, dental arch observation is performed on the initial dental arch model using oral scanning software. By performing dental arch observation on the initial dental arch model, the parallel relationship between the axial planes of each remaining tooth 20 and the parallel relationship between each remaining tooth 20 and the alveolar ridge surface are determined, thereby determining the design scheme of the metal framework 10.

[0060] Step 300: Design the removable denture metal framework 10 based on the posterior dentition model. Determine the denture insertion direction and observe undercuts in the soft and hard tissues using the design software. In this embodiment, the denture insertion direction is the insertion direction of the metal framework 10. After designing the removable denture metal framework 10, design the abutment 11, connector 12, proximal panel 13, retainer 14, and base connector 15. Based on the position of the artificial teeth 50 to be arranged, install the assembly structure 70 at the corresponding location on the base connector 15. In this embodiment, the corresponding location on the base connector 15 is determined by the position of the artificial teeth 50 to be arranged. Using the line connecting the abutments 11 near the abutment teeth as the axis of rotation, physiologically adjust the morphology of the metal framework 10 to obtain a metal framework model with the assembly structure.

[0061] Step 400: Based on the metal framework model, fabricate the metal framework 10 and obtain the actual positional relationship between the metal framework 10 and the remaining tooth 20 to obtain the metal framework-remaining tooth model.

[0062] Step 500: Obtain the accurate morphology of the mucosa in the edentulous area and the actual positional relationship between the mucosa in the edentulous area and the remaining tooth 20 and the metal framework 10, to obtain the free end mucosa-remaining tooth model.

[0063] Step 600: Using software, the metal framework-remaining tooth model and the free end mucosa-remaining tooth model are registered with the dentition model after tooth preparation, so that the positional relationship between the metal framework 10, the remaining tooth 20, and the free end mucosa 30 is consistent with the actual positional relationship in the patient's mouth, thus obtaining the actual positional model of the free end mucosa-metal framework.

[0064] In this embodiment, the dentition portions of the metal framework-remaining tooth model, the free-end mucosa-remaining tooth model, and the post-preparation dentition model are used as registration reference points to complete the registration of these three models. By completing the registration of these three models, a corrected model of the actual position of the free-end mucosa-metal framework can be obtained, ensuring that the tissue surfaces of the final restoration's metal framework 10 and base 60 can simultaneously maintain close contact with the patient's teeth and the edentulous mucosa, thus improving the fabrication accuracy and stability of the restoration.

[0065] Step 700: Using software, design the base 60, the artificial tooth 50, and the assembly structure 70 based on the actual position model of the free end mucosa-metal framework, and obtain the base model with assembly structure and the artificial tooth model with assembly structure, respectively.

[0066] Step 800: Fabricate artificial teeth 50 and base 60 according to the base model and artificial tooth model respectively; assemble artificial teeth 50 and base 60 onto metal bracket 10 through assembly structure 70.

[0067] According to the embodiment of the present invention, the method for digital design and fabrication of removable partial dentures with metal frameworks involves physiologically adjusting the shape of the metal framework 10 by using the line connecting the abutment 11 of the near-missing tooth as the axis of rotation during the design of the metal framework 10. This allows for the grinding of areas of excessive contact between the metal framework 10 and the remaining tooth 20, enabling the metal framework 10 to rotate freely to a certain extent. This efficiently and accurately obtains a metal framework 10 that fits the patient's dentition model after tooth preparation. By registering the metal framework-remaining tooth model and the free end mucosa-remaining tooth model with the dentition model after tooth preparation, the positional relationship between the metal framework 10, the remaining tooth 20, and the free end mucosa 30 is kept consistent with their actual positional relationship in the patient's mouth. This obtains a digital correction model and ensures that the tissue surfaces of the metal framework and resin base of the final restoration can simultaneously maintain close contact with the patient's teeth and the mucosa of the edentulous area, improving the fabrication accuracy and stability of the restoration. The present invention provides a digital design and fabrication method for removable partial dentures with metal frameworks. By using software, the physiological adjustment of digital metal frameworks and the acquisition of digital correction models are realized. This method can reduce the complex procedures in traditional removable denture fabrication methods, improve the fabrication accuracy and stability of the prosthesis, reduce the number of follow-up visits and treatment time for patients, and improve clinical work efficiency.

[0068] In embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the digital model of the metal framework with assembly structure includes a support 11, a connector 12, a proximal panel 13, a retainer 14, a base connector 15, and an assembly structure 70. The support 11, connector 12, proximal panel 13, retainer 14, base connector 15, and assembly structure 70 are designed as a single unit using design software. The support 11 and retainer 14 are used to fix the metal framework 10. The connector 12 and proximal panel 13 are replicated based on the posterior dentition model after tooth preparation, and the proximal panel 13 is adapted to the remaining tooth 20. The base connector 15 is located at the end of the metal framework 10 furthest from the remaining tooth 20, and the assembly structure 70 is disposed on the base connector 15.

[0069] When physiologically adjusting the metal framework 10 in the design software, the metal framework 10 uses the abutment 11 as a support point and the line connecting the abutments 11 to the abutment near the dentition tooth as a rotation axis. The metal framework 10 rotates around the rotation axis, causing the end of the metal framework 10 away from the remaining tooth 20 to sink 0.3-0.5mm towards the mucosa. By observing the change in the relative position between the metal framework 10 and the remaining tooth 20, the tooth axial surface area where they contact and conflict during rotation is selected. The selected tooth axial surface area is then subtracted from the rotated metal framework model using a Boolean subtraction operation. The excessive contact area between the proximal plate 13 of the metal framework 10 and the remaining tooth 20 is ground down, and the metal framework model is then appropriately smoothed. This completes the finishing of the metal framework model, which better fits the post-dental arch model. Simultaneously, through physiological adjustments to the metal framework 10, the occlusal force can be transmitted along the long axis of the abutment tooth, eliminating the need for the abutment tooth to bear the lateral and non-axial forces applied by the metal framework, thus achieving longer-lasting and more effective protection of the abutment tooth. The modified metal framework model is rotated back to its initial position, enabling physiological adjustments of the metal framework 10 to be completed in the software. This allows for efficient and accurate acquisition of a metal framework 10 that fits the patient's dentition model after tooth preparation, significantly saving clinical time.

[0070] In embodiments of the present invention, the steps of obtaining the accurate morphology of the edentulous mucosa and the actual positional relationship between the edentulous mucosa and the remaining tooth 20 and the metal framework 10 include:

[0071] Step 510: Based on the initial dentition model and the dentition model after tooth preparation, design an impression base plate 40 for taking impressions, print the impression base plate 40, and fix the impression base plate 40 to the metal support 10. Use heavy silicone rubber material to perform functional shaping on the edge of the impression base plate 40, and use silicone rubber material to record the occlusal relationship on the occlusal surface of the impression base plate 40; place light silicone rubber material on the tissue surface of the impression base plate 40 to obtain a fine impression of the free end of the mucosa in the free end defect area.

[0072] Figure 6 A schematic diagram illustrating the connection relationship between the printing plate and the metal support provided in an embodiment of the present invention is shown, such as... Figure 6 As shown, the 3D-printed impression substrate 40 is connected to the metal support 10 in a grid-like structure, and the impression substrate 40 and the metal support 10 are temporarily fixed by fluid resin.

[0073] Step 520: Intraoral scanning is used to obtain the positional relationship between the free end fine impression and the remaining tooth 20, resulting in a free end impression-remaining tooth model.

[0074] Step 530: Remove the metal framework 10, scan the edentulous area outside the mouth, obtain the complete morphological data of the free end mucosa 30, and obtain the free end impression model.

[0075] In this embodiment, the metal support 10 has a fine impression, and the occlusal surface of the fine impression records the occlusal relationship, that is, the fine impression has complete morphological data of the free end mucosa 30.

[0076] Step 540: Register the free end impression model with the free end impression-remaining tooth model to obtain the actual positional relationship between the mucosa of the missing tooth and the remaining tooth 20, and obtain the free end mucosa-remaining tooth model.

[0077] In an embodiment of the present invention, the distance between the impression substrate 40 and the tissue surface of the initial dental arch model is greater than 1 mm, and the impression substrate 40 and the metal support 10 are connected by fluid resin.

[0078] In an embodiment of the present invention, the steps of fabricating a metal framework 10 based on a metal framework model and obtaining the actual positional relationship between the metal framework 10 and the remaining tooth 20 include:

[0079] Step 410: 3D print the metal bracket model to obtain the metal bracket 10.

[0080] The physiologically adjusted metal scaffold model was sliced ​​and then printed using a 3D printing device to obtain the metal scaffold 10. In this embodiment, the metal scaffold 10 was 3D printed using selective laser sintering (SLS) technology and a 3D printing device (BLT-S200). The material used for 3D printing was TC4 titanium alloy. However, the 3D printing material for the metal scaffold 10 is not limited to TC4 titanium alloy and can also be other metal materials.

[0081] Step 420: Adjust the position of the metal framework 10 in the patient's mouth, and after confirming that the trial fitting is appropriate, perform an intraoral scan to obtain the actual positional relationship between the metal framework 10 and the remaining tooth 20, and obtain the metal framework-remaining tooth model.

[0082] Figure 5 A schematic diagram of the digital model of the actual positional relationship between the metal framework and the remaining tooth provided in an embodiment of the present invention is illustrated, such as... Figure 5 As shown, when the patient visits for the second time, the post-processed metal framework 10 is tried on in the patient's mouth, and the position of the metal framework 10 in the patient's mouth is adjusted. After confirming that it is suitable, the actual positional relationship between the metal framework 10 and the remaining tooth 20 is obtained by intraoral scanning, and then the metal framework-remaining tooth model is obtained.

[0083] In an embodiment of the present invention, after the step of 3D printing the metal support model, the method further includes:

[0084] Step 411: Grinding, polishing and heat treatment are performed on the metal bracket 10 in sequence.

[0085] The surface finish of the 3D-printed metal bracket 10 is improved by grinding, polishing, and heat treatment, thereby enhancing the comfort of the patient when wearing it.

[0086] In an embodiment of the present invention, the steps of fabricating the artificial tooth 50 and the base 60 according to the base model and the artificial tooth model respectively include:

[0087] Step 801: 3D print the base model and the artificial tooth model to obtain the artificial tooth 50 and the base 60.

[0088] Alternatively, in step 802, the resin material is cut according to the base model and the artificial tooth model to obtain the artificial tooth 50 and the base 60.

[0089] In this embodiment, the resin material is machined using CNC machining to improve cutting accuracy and enhance wearing comfort. However, the machining method for the resin material is not limited to CNC machining and can be other methods as well.

[0090] In an embodiment of the present invention, the steps of fabricating the artificial tooth 50 and the base 60 based on the base model and the artificial tooth model respectively further include:

[0091] Step 810: Grind and polish the artificial tooth 50 and the base 60 respectively.

[0092] In the embodiments of the present invention, both the artificial tooth 50 and the base 60 are made of resin. By grinding and polishing the artificial tooth 50 and the base 60 respectively, the surface smoothness of the artificial tooth 50 and the base 60 is improved, which effectively improves the comfort of the patient when wearing them.

[0093] In this embodiment, the base 60 is made of DENTCA resin, and the artificial tooth 50 is made of Bego resin. The base 60 and the artificial tooth 50 are 3D printed using digital light processing (DLP) technology.

[0094] Figure 7 A top-view digital model diagram of an artificial tooth model with an assembly structure provided in an embodiment of the present invention is illustrated. Figure 8 A schematic diagram of a bottom-view digital model of an artificial tooth model with an assembly structure provided in an embodiment of the present invention is shown. Figure 9 A top-view digital model diagram of the base model with assembly structure provided in an embodiment of the present invention is illustrated. Figure 10 A schematic diagram of a bottom-view digital model of a base model with an assembly structure provided in an embodiment of the present invention is shown. Figure 11 A schematic diagram illustrating the assembly relationship between the artificial tooth, metal framework, and denture base provided in an embodiment of the present invention is illustrated. Figure 12An example is a schematic diagram of a digital model of a denture after it has been worn, as provided in an embodiment of the present invention. Figures 7 to 12 As shown, the artificial tooth 50 and the base 60 are assembled to the metal framework 10 via the assembly structure 70. Specifically, the assembly structure 70 of the artificial tooth 50 is connected to the assembly structure 70 of the metal framework 10, and the assembly structure 70 of the base 60 is connected to the assembly structure 70 of the metal framework 10, thus completing the fabrication of the restoration. The restoration is then delivered to the dentist to complete the patient's final restoration, allowing the patient to have their missing teeth repaired during a second visit, thereby reducing the number of visits required.

[0095] According to the digital design and fabrication method for removable partial dentures with metal framework provided by the present invention, a sandwich-style assembly structure is completed by connecting the assembly structure 70 of the artificial tooth 50 with the assembly structure 70 of the metal framework 10, and connecting the assembly structure 70 of the metal framework 10 with the assembly structure 70 of the base 60. The assembly gap between the artificial tooth 50 and the metal framework 10 is 0.1-0.2 mm, and the assembly gap between the metal framework 10 and the base 60 is 0.1-0.2 mm. The assembly accuracy deviation between the three components can reach within 0.3 mm. The sandwich-style assembly structure achieves accurate connection between the three components, improving the assembly accuracy and stability of the three components.

[0096] The following is combined Figures 1 to 12 This invention describes a specific embodiment of the digital design and fabrication method for metal-framed removable partial dentures provided by the present invention.

[0097] Step 1100: When the patient visits for the first time, use the Ruike CS3600 intraoral scanner to scan the three-dimensional data of the patient's intraoral dentition to obtain the patient's initial dentition model.

[0098] Step 1200: Observe the initial dentition model in the oral scanning software, determine the design scheme of the metal framework 10, and scan the three-dimensional information data of the dentition in the patient's mouth after preparing the abutment teeth according to the design scheme to obtain the dentition model after tooth preparation.

[0099] Step 1300: Based on the posterior dentition model, the morphology of the metal framework 10 and the pre-arrangement of the artificial teeth 50 are designed using denture design software (Exocad DentalCAD). According to the arrangement of the artificial teeth 50, assembly structures 70 are added to the metal framework 10 at appropriate positions using 3D scanning analysis software (Geomagic Wrap). After adding the assembly structures 70, the metal framework 10 is rotated around the axis of rotation, using the abutment 11 as the support point and the line connecting the abutments 11 to the abutment near the nick of tooth 20 as the axis of rotation. This causes the end of the metal framework 10 furthest from the remaining tooth 20 to sink 0.3-0.5 mm towards the mucosa, and the change in the relative position between the metal framework 10 and the remaining tooth 20 is observed. The tooth axial surface region where the two parts come into contact and conflict during rotation is selected, and a subtractive Boolean operation is performed with the rotated metal framework model. The excessive contact area between the adjacent panel 13 of the metal framework 10 and the remaining tooth 20 is adjusted and ground, and then the metal framework model is appropriately smoothed. The modified metal framework model is then rotated back to its initial position, completing the physiological adjustment of the morphology of the metal framework 10. Through the physiological adjustment of the morphology of the metal framework 10, a metal framework model with assembly structure is obtained.

[0100] Step 1410: The metal bracket model with assembly structure is sliced ​​and processed using selective laser sintering (SLS) technology and 3D printing equipment (BLT-S200). The metal bracket 10 is then subjected to post-processing such as grinding, polishing and heat treatment.

[0101] Step 1420: During the patient's second visit, the post-processed metal framework 10 is tried on in the patient's mouth, and its position is adjusted. After the metal framework 10 is properly adjusted, the three-dimensional data of the patient's dentition is scanned using a Ruike CS3600 intraoral scanner to obtain the actual positional relationship between the metal framework 10 and the remaining tooth 20, thus obtaining a metal framework-remaining tooth model.

[0102] Step 1510: By designing the impression substrate 40 and recording the occlusal relationship on the occlusal surface of the impression substrate 40, the accurate morphology of the mucosa in the edentulous area is obtained, and a fine impression of the free end of the mucosa in the free end defect area is made.

[0103] Step 1520: Obtain the positional relationship between the free end fine impression and the remaining tooth 20 through intraoral scanning to obtain the free end impression-remaining tooth model.

[0104] Step 1530: Obtain complete morphological data of the free end mucosa 30 by scanning the edentulous area of ​​the free end fine impression outside the mouth, and obtain the free end impression model.

[0105] Step 1540: The free end fine impression and the free end impression-remaining tooth model are registered using 3D scanning analysis software (Geomagic Wrap) to obtain the actual positional relationship between the mucosa of the missing tooth and the remaining tooth 20, thus obtaining the free end mucosa-remaining tooth model.

[0106] Step 1600: Using 3D scanning analysis software (Geomagic Wrap), the metal framework-remaining tooth model and the free end mucosa-remaining tooth model are registered with the posterior dentition model after tooth preparation, so that the positional relationship between the metal framework 10, the remaining tooth 20, and the free end mucosa 30 is consistent with their actual positional relationship in the patient's mouth. This ensures that the positional relationship between the metal framework 10 and the remaining tooth 20 is consistent with their actual positional relationship in the patient's mouth, and the positional relationship between the metal framework 10 and the free end mucosa 30 is consistent with their actual positional relationship in the patient's mouth, thus obtaining the actual positional model of the free end mucosa-metal framework.

[0107] Step 1700: Based on the actual position model of the free end mucosa-metal framework, the design of artificial tooth 50, base 60 and assembly structure 70 are completed using denture design software (Exocad DentalCAD), resulting in an artificial tooth model with assembly structure and a base model with assembly structure.

[0108] Step 1810: The artificial tooth model with assembly structure is 3D printed using resin material and digital light processing (DLP) technology to complete the fabrication of artificial tooth 50; the base model with assembly structure is 3D printed using resin material and digital light processing (DLP) technology to complete the fabrication of base 60. After the fabrication of artificial tooth 50 and base 60 is completed, artificial tooth 50 and base 60 are respectively ground and polished.

[0109] Step 1820: According to the assembly structure designed in the software, the base 60 is assembled to the metal framework 10 from bottom to top, and the artificial tooth 50 is assembled to the metal framework 10 from top to bottom. After adjusting and confirming the assembly position, light-cured resin is used for bonding and curing to obtain the restoration. The restoration is then polished to complete the fabrication of the restoration. After the restoration is completed, it is delivered to the dentist to complete the patient's final restoration, thus enabling the patient to meet their need for tooth replacement at their second visit and reducing the number of visits required.

[0110] The present invention provides a digital design and fabrication method for removable partial dentures with metal frameworks, which realizes the physiological adjustment of digital metal frameworks and the acquisition of digital correction models. It can reduce the complex procedures in traditional removable denture fabrication methods, improve the fabrication accuracy and stability of restorations, reduce the number of follow-up visits and treatment time for patients, and improve clinical work efficiency.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for digital design and fabrication of a metal framework removable partial denture, characterized in that, include: Scan the patient's intraoral dentition three-dimensional data to obtain an initial dentition model; The initial dental arch model was used for dental arch observation to determine the design scheme of the metal framework; According to the design plan, after preparing the abutment teeth in the patient's mouth, the three-dimensional information data of the dental arch in the mouth is scanned to obtain the dental arch model after tooth preparation; Based on the prepared dentition model, the metal framework of the removable denture is designed. The denture insertion direction is determined in the design software and the undercuts of soft and hard tissues are observed. The supports, connectors, proximal panels, retainers, and base connectors are designed. According to the position of the artificial teeth to be arranged, the assembly structure is set at the corresponding part of the base connector. Using the abutment line on the near-missing abutment tooth as the axis of rotation, the morphology of the metal framework was physiologically adjusted to obtain a metal framework model with assembly structure. Based on the metal framework model, a metal framework is fabricated and the actual positional relationship between the metal framework and the remaining tooth is obtained to obtain the metal framework-remaining tooth model. The accurate morphology of the mucosa in the edentulous area and the actual positional relationship between the mucosa in the edentulous area and the remaining teeth and metal framework are obtained to obtain the free end mucosa-remaining tooth model; The metal framework-remaining tooth model and the free end mucosa-remaining tooth model were registered with the dentition model after tooth preparation using software, so that the positional relationship between the metal framework, the remaining tooth, and the free end mucosa was consistent with the actual positional relationship in the patient's mouth, thus obtaining the actual positional model of the free end mucosa-metal framework. Based on the actual position model of the free end mucosa-metal framework, the base design, artificial tooth design, and assembly structure design were carried out using software, resulting in a base model with assembly structure and an artificial tooth model with assembly structure. Artificial teeth and bases are fabricated according to the base model and the artificial tooth model, respectively; the artificial teeth and bases are assembled onto the metal bracket using the assembly structure; The steps of obtaining the accurate morphology of the edentulous mucosa and the actual positional relationship between the edentulous mucosa and the remaining teeth and metal framework include: Based on the initial dentition model and the dentition model after tooth preparation, an impression base plate for taking impressions is designed, the impression base plate is printed, and the impression base plate is fixed to the metal support; the edges of the impression base plate are functionally shaped using heavy silicone rubber material, and the occlusal relationship is recorded on the occlusal surface of the impression base plate using silicone rubber material; a light silicone rubber material is placed on the tissue surface of the impression base plate to obtain a fine impression of the free end of the mucosa in the free end defect area. Intraoral scanning was used to obtain the positional relationship between the free end fine impression and the remaining tooth, resulting in a free end impression-remaining tooth model; Remove the metal framework, scan the edentulous area outside the mouth, obtain complete morphological data of the free end mucosa, and obtain a free end impression model; The free end impression model is registered with the free end impression-remaining tooth model to obtain the actual positional relationship between the mucosa and the remaining tooth at the site of tooth loss, thus obtaining the free end mucosa-remaining tooth model.

2. The method for digital design and fabrication of a metal framework removable partial denture according to claim 1, wherein, The distance between the impression base plate and the tissue surface of the initial dental arch model is greater than 1 mm.

3. The method for digital design and fabrication of a metal framework removable partial denture according to claim 2, wherein, The printing plate and the metal support are connected by a fluid resin.

4. The method for digital design and fabrication of a metal framework removable partial denture according to claim 3, wherein, The steps of fabricating artificial teeth and denture bases based on the denture base model and the artificial tooth model respectively include: The denture base model and the artificial tooth model are 3D printed to obtain the artificial tooth and the denture base; Alternatively, the resin material can be cut according to the base model and the artificial tooth model to obtain the artificial tooth and the base.

5. The method for digital design and fabrication of a metal framework removable partial denture according to claim 2 or 3, wherein, After the step of fabricating the artificial tooth and the base based on the base model and the artificial tooth model respectively, the method further includes: The artificial teeth and the base are respectively ground and polished.

6. The method for digital design and fabrication of a metal framework removable partial denture according to any one of claims 1 to 3, wherein, The steps of fabricating a metal framework based on the metal framework model and obtaining the actual positional relationship between the metal framework and the remaining tooth include: The metal bracket model is 3D printed to obtain the metal bracket; The position of the metal framework in the patient's mouth is adjusted, and an intraoral scan is performed after confirming that the fitting is suitable to obtain the actual positional relationship between the metal framework and the remaining tooth, thus obtaining a metal framework-remaining tooth model.

7. The method for digital design and fabrication of a metal framework removable partial denture according to claim 6, wherein, Following the step of 3D printing the metal support model, the method further includes: The metal bracket is subjected to grinding, polishing, and heat treatment in sequence.

8. The method for digital design and fabrication of a metal framework removable partial denture according to claim 7, wherein, Both the artificial teeth and the denture base are made of resin.

9. The method for digital design and fabrication of a metal framework removable partial denture according to claim 7, wherein, Both the artificial teeth and the base are bonded to the metal framework with resin adhesive.

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