Digital complete denture manufacturing method

Abstract

The invention provides a digital complete denture manufacturing method which comprises the following steps: designing a personalized tooth test tray with exposed anterior teeth on the basis of surface scanning and an impression, then wearing the personalized tooth test tray to manufacture a closed impression, determining a vertical and horizontal jaw position relationship, and then precisely machining a complete denture by adopting a digital method. By adopting the method provided by the invention, the patient can wear a pair of closely-attached and comfortable complete dentures when seeing a doctor for the third time. The whole-process digital processing method is adopted, clinical operation is more standard and consistent, the comfort level of a patient is improved, and the processing time and difficulty are greatly reduced.

Description

Technical Field

[0001] The invention relates to a complete denture, and in particular to a method for manufacturing a digital complete denture. Background Art

[0002] Full dentures are the main method of restoring edentulous jaws, and manual operation is still used in clinical practice. It takes years of clinical experience to make a full denture that satisfies the patient. The traditional impression paste technique is very sensitive. Only after long-term experience accumulation can the operator master the subtle changes in the force used to pull the lip and cheek muscles, and use forces of different sizes and directions for different situations. In addition to the complexity of clinical operations, it is also very difficult for dental technicians to make full dentures. The arrangement of 28 teeth in all directions is not easy. Even for experienced dental technicians, it takes at least half a day to produce a denture that meets the perfect balance, and any slight modification must be chained. (Reference book: Jiro Abe, Kyoko Kokubo, Yukiji Sato. Mandibular suction denture and BPS clinical guide)

[0003] As digital technology is applied in the field of oral fixed restoration, researchers are trying to use digital technology for full denture restoration. At present, digital technology has been explored in all stages of full denture diagnosis and treatment, but there are difficulties in the process, such as the complex installation of Gothic bows and face bows, and the existing digital production process cannot achieve the same effect as traditional methods, so it has not yet been widely used.

[0004] Specifically speaking, the edentulous jaw impression obtained by simple intraoral scanning cannot meet the requirements of full denture production, and can only meet the theoretical requirements after a secondary impression; the tooth arrangement can be completed using commercial software, and the technology is relatively mature; the jaw relationship needs to be determined by wax ridges, Gothic bows or mandibular movement recording systems, and then the buccal scan is used to obtain data, but it is more troublesome to install the Gothic bow on the digital tray; the facebow transfer technology is highly sensitive, requires many supporting equipment, and is difficult to apply clinically; in terms of production technology, the mechanical strength and biosafety of additive manufacturing need to be improved, and CNC cutting requires cutting in different areas and then bonding, so the aesthetics and long-term function remain to be seen. Since full denture production itself involves multiple clinical and processing processes, full-process digital technology has great medical, social and economic value in saving manpower and improving efficiency, and it is urgent to continue to develop and explore the parts of existing technologies that cannot be solved digitally. Summary of the invention

[0005] The present invention provides a method for producing a digital complete denture, the method comprising the following steps:

[0006] S1. Obtain digital information of the intraoral soft tissues of the upper and lower jaws and establish a digital model of the intraoral soft tissues;

[0007] S2. Establishing a digital model of a face scanning tray according to the digital model of the intraoral soft tissue, wherein the digital model of the face scanning tray comprises a first maxillary tray model and a first mandibular tray model, wherein the first maxillary tray model is integrally formed with a registration tray model extending outside the mouth, and the registration tray model is provided with marking points on the part outside the mouth;

[0008] S3, printing and forming the digital model of the face scan tray and placing it in the patient's mouth, and obtaining the median relationship between the upper and lower jaws and the digital face scan information after face scan registration by optically scanning the registration tray outside the mouth;

[0009] S4, establishing a digital model of a trial tooth tray according to the digital face scan information, wherein the digital model of the trial tooth tray includes a second maxillary tray model, a second mandibular tray model, and a Gothic bow tracing model, wherein a plurality of anterior teeth are arranged on the labial side of the second maxillary tray model, and the Gothic bow tracing model includes an upper Gothic bow model and a lower Gothic bow model which are detachably connected to the second maxillary tray model and the second mandibular tray model, respectively;

[0010] S5, respectively printing out the digital models of the trial tooth trays, installing the upper Gothic arch and the lower Gothic arch on the second maxillary tray and the second mandibular tray respectively, filling the inner surfaces of the second maxillary tray and the second mandibular tray in contact with the alveolar ridge with silicone rubber, and then placing them in the patient's mouth to make a closed-mouth impression, and the patient's mandible moves forward and laterally, and the patient's movement trajectory is traced on the plane plate of the upper Gothic arch to determine the position of the horizontal jaw position relationship;

[0011] S6. Scan the final impression of the closed-mouth impression and design and generate the digital models of the maxillary and mandibular half-mouth final dentures respectively in combination with the horizontal jaw position relationship;

[0012] S7, fitting the digital model of the half-mouth final denture into the digital model of the mold box, subtracting the digital model of the half-mouth final denture from the digital model of the mold box, and forming a cavity having the outline of the digital model of the half-mouth final denture in the digital model of the mold box;

[0013] S8, dividing the mold box digital model into two upper and lower mold box digital models, wherein the lower mold box digital model is provided with a tooth row groove;

[0014] S9, the upper and lower mold boxes are digitally printed and formed respectively, and the prefabricated finished teeth are placed into the tooth groove of the lower mold box, and then the upper and lower mold boxes are molded together and the base material is injected into the cavity, and the base and the finished teeth are tightly combined as the maxillary final denture or the mandibular final denture;

[0015] S10. Repeat steps S7-S9 to prepare another set of final dentures.

[0016] Furthermore, in step S1, the method for obtaining digital information of the intraoral soft tissues of the upper and lower jaws is as follows:

[0017] Insert the digital oral impression device into the patient's mouth to scan the inside of the mouth to obtain digital information of the intraoral soft tissues of the upper and lower jaws.

[0018] Furthermore, in step S1, the method for obtaining digital information of the intraoral soft tissues of the upper and lower jaws is as follows:

[0019] The inner surfaces of the maxillary and mandibular impression trays that contact the alveolar ridge are filled with silicone rubber and then placed in the patient's mouth to make a closed-mouth impression. The initial impression of the closed-mouth impression is taken out and optically scanned to obtain digital information on the intraoral soft tissues of the maxillary and mandibular regions.

[0020] Furthermore, in step S3, the inner surfaces of the first maxillary tray and the first mandibular tray that are in contact with the alveolar ridge are filled with silicone rubber and then placed in the patient's mouth.

[0021] Furthermore, in step S4, the digital models of the standard parts of the upper Gothic bow and the lower Gothic bow are imported into the digital model design software, and the digital models of the standard parts of the upper Gothic bow and the lower Gothic bow are adjusted according to the second maxillary tray model and the second mandibular tray model, and after the adjustment, the upper Gothic bow model and the lower Gothic bow model are formed, and the second maxillary tray model and the upper Gothic bow model are designed to match the connecting mechanisms, and the second mandibular tray model and the lower Gothic bow model are designed to match the connecting mechanisms;

[0022] In step S5, after the second maxillary tray model, the second mandibular tray model, the upper Gothic bow model, and the lower Gothic bow model are printed and formed respectively, the upper Gothic bow and the lower Gothic bow are installed on the second maxillary tray and the second mandibular tray respectively.

[0023] Furthermore, both the upper Gothic bow and the lower Gothic bow are provided with a U-shaped body and a crossbar connected across the two ends of the U-shaped body, the crossbar is higher than one end surface of the U-shaped body, a tracing board is provided in the middle of the crossbar of the upper Gothic bow, and a threaded hole is provided in the middle of the crossbar of the lower Gothic bow; slots for accommodating the crossbar are provided on both sides of the occlusal end surfaces of the second upper jaw tray and the second lower jaw tray;

[0024] A protruding connecting column is provided in the card slot, and connecting holes matching with the connecting column are provided on both sides of the upper Gothic bow and the lower Gothic bow;

[0025] The U-shaped main body is provided with a plurality of protruding positioning columns, and the occlusal end surfaces of the second maxillary tray and the second mandibular tray are both provided with a plurality of positioning holes matched with the positioning columns.

[0026] Furthermore, in step S8, the digital mold model is divided into two upper and lower digital mold models using the connecting line of the necks of the teeth as a tangent.

[0027] Furthermore, the method further comprises embedding a metal base plate in the maxillary final denture, the specific steps being as follows:

[0028] In step S6, a metal base plate model is digitally designed, and the metal base plate model is fitted with the digital model of the maxillary final denture to obtain a metal plate half-mouth final denture model;

[0029] In step S7, the metal plate half-mouth final denture model is fitted into the mold box digital model, the metal plate half-mouth final denture model is subtracted from the mold box digital model, and a cavity having the contour of the metal plate half-mouth final denture model is formed in the mold box digital model;

[0030] In step S8, the mold box digital model is divided into two upper and lower mold box digital models, and the lower mold box digital model is provided with a tooth row groove;

[0031] In step S9, the digital models of the upper and lower mold boxes are printed separately, and after the prefabricated finished teeth are placed in the tooth grooves of the lower mold box, the printed metal base plate is placed in the lower mold box. Subsequently, the upper and lower mold boxes are molded together and injection molding is performed in the cavity to form a base with a metal base plate embedded in it and tightly combined with the finished teeth, thereby forming a maxillary final denture.

[0032] Furthermore, the contact end surfaces of the upper and lower mold boxes are provided with steps that engage with each other;

[0033] In step S9, after the upper and lower mold boxes are molded together, the upper and lower mold boxes are fastened and sealed together using a clamping device.

[0034] Furthermore, the method further comprises: fine-tuning the formed complete denture, the steps comprising:

[0035] In step S7, the following steps are performed: designing a positioning mechanism on the outer surface of the digital model of the lower mold box;

[0036] After step S10 is completed, the following steps are performed:

[0037] S11. After the injection molding of the half-mouth final dentures of the maxilla and the mandible is completed, the upper mold box is opened, and the two lower mold boxes loaded with the maxillary final dentures and the mandibular final dentures are fixed to an occlusal adjustment fixture, wherein the occlusal adjustment fixture is provided with an upper fixture and a lower fixture that can rotate relative to each other up and down, and the two lower mold boxes are respectively accurately positioned and connected with the upper fixture and the lower fixture through the positioning mechanism on the outer surface;

[0038] S12. Adjust the upper and lower fixtures to make the maxillary final denture and the mandibular final denture occlude, fix the upper and lower fixtures, and adjust the maxillary final denture and the mandibular final denture to meet the intraoral occlusal state requirements.

[0039] This method introduces facial scanning into the data collection of the initial visit. The first personalized trial tooth tray is designed based on the facial scan and impression. The closed-mouth impression is made during the second visit, and the vertical and horizontal jaw position relationship is determined. After that, the denture is precisely processed using a digital method. At the third visit, a pair of close-fitting and comfortable full dentures can be worn. In addition, the full-process digital processing method improves the production accuracy and efficiency of full dentures, reduces the errors that may occur in the traditional manual production process, makes the personalized design of dentures more accurate, and makes clinical operations more standardized and consistent. Patient comfort is improved, and the processing time and difficulty are greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 This is a schematic diagram of the intraoral soft tissue digital model of the maxillary soft tissue obtained in the implementation steps of the present invention in Example 1;

[0042] Figure 2 A schematic diagram of a digital model of intraoral soft tissue for obtaining mandibular soft tissue in the implementation steps of the present invention;

[0043] Figure 3 A schematic diagram of a face scan tray digitized model including a first maxillary tray model, a first mandibular tray model and a registration tray model extending outside the mouth;

[0044] Figure 4 This is a scanning diagram of the face scanning tray being placed in the patient's mouth after the digital model is printed;

[0045] Figure 5 This is a scanning diagram of the face scanning tray being placed in the patient's mouth after the digital model is printed;

[0046] Figure 6 A schematic diagram of a second maxillary tray having a plurality of anterior teeth formed in one piece;

[0047] Figure 7 for Figure 6 Schematic diagram from another perspective;

[0048] Figure 8A schematic diagram of the Upper Gothic bow;

[0049] Fig. 9 This is a schematic diagram of the second mandibular tray;

[0050] Fig.10 This is a schematic diagram of the Lower Gothic bow;

[0051] Fig.11 Schematic diagram of assembling the upper Gothic bow and the lower Gothic bow with the second upper jaw tray and the second lower jaw tray respectively;

[0052] Fig.12 for Fig.11 Schematic diagram from another perspective;

[0053] Fig.13 Schematic diagram of importing the digital model of the finished dentition into the upper and lower jaw soft tissue models;

[0054] Fig.14 For Fig.13 Schematic diagram of the base part of the design;

[0055] Fig.15 A digital model of the designed maxillary denture;

[0056] Fig.16 Schematic diagram of introducing the maxillary denture into the digital model of the mold box;

[0057] Fig.17 This is a schematic diagram of the printed lower mold box with tooth grooves;

[0058] Fig.18 A schematic diagram of placing the finished teeth into the groove of the lower mold box;

[0059] Fig.19 This is a schematic diagram of the upper and lower mold boxes after mold closing and injection molding;

[0060] Fig. 20 A schematic diagram of opening the upper mold box to form the maxillary final denture in the lower mold box;

[0061] Fig.21 Schematic diagram of another set of upper and lower mold boxes forming the mandibular final denture inside;

[0062] Fig. 22 A schematic diagram of opening the upper mold box to form the mandibular final denture in the lower mold box;

[0063] Fig.23 It is a schematic diagram of two lower mold boxes containing upper and lower complete dentures fixed to the occlusal adjustment fixture in the second embodiment;

[0064] Fig.24 is a schematic diagram of the bite adjustment fixture in the second embodiment;

[0065] Fig.25 It is a schematic diagram of two lower mold boxes with a first positioning mechanism in the second embodiment;

[0066] Fig.26 It is a schematic diagram of the occlusion of the upper and lower mandibular complete dentures of two lower mold boxes in Example 2;

[0067] Fig. 27 This is a diagram of a hinge structure in which two lower mold boxes are provided with rotationally matched hinges in embodiment 3;

[0068] Fig.28 is a schematic diagram of a hinge in Embodiment 3;

[0069] Fig.29 This is a schematic diagram of a digitally designed metal base plate model in Embodiment 4;

[0070] Fig.30 This is a schematic diagram of implanting a finished tooth and a metal base plate in a lower mold box in Example 4;

[0071] Fig.31 This is a schematic diagram of the upper and lower mold boxes after mold closing and injection molding in Example 4;

[0072] Fig.32 This is the maxillary final denture with a metal base plate in Example 4. DETAILED DESCRIPTION

[0073] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0074] In order to fully understand the present invention, detailed steps and detailed structures will be proposed in the following description to illustrate the technical solution of the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0075] Embodiment 1

[0076] The present invention provides a method for manufacturing a digital complete denture, the manufacturing method comprising the following steps:

[0077] Step S1: Obtain digital information of the soft tissues in the upper and lower jaws and establish Figure 1 and Figure 2 The digital model 1 of the intraoral soft tissue corresponding to the upper and lower jaw soft tissue is shown. The present invention can obtain the digital information of the intraoral soft tissue of the upper and lower jaw by means of optical impression or silicone rubber impression.

[0078] The process of optical impression is: insert the digital oral impression device into the patient's mouth to scan the inside of the mouth to obtain digital information of the soft tissues in the upper and lower jaws.

[0079] The process of silicone rubber impression is as follows: take the maxillary impression tray and the mandibular impression tray, fill the inner surface of the upper and lower mandibular impression trays in contact with the alveolar ridge with silicone rubber, and then put them into the patient's mouth to make a closed-mouth impression, take out the initial impression of the closed-mouth impression and perform an optical scan to obtain digital information on the intraoral soft tissue of the upper and lower jaws.

[0080] S2, based on the digital model of intraoral soft tissue 1 Figure 3 The face scanning tray digitized model 20 shown includes a first maxillary tray model 21 and a first mandibular tray model 22. The first maxillary tray model 21 is integrally formed with a registration tray model 23 extending outside the mouth. The registration tray model 23 is provided with a marking point 23-1 on the part outside the mouth for use as a registration area.

[0081] S3. After the face scan tray digital model 20 is printed and formed, a silicone rubber material is placed in the tray and then placed in the patient's mouth. The registration tray outside the mouth is optically scanned, and the position of the tray inside the oral cavity can be located through the marking point 23-1, so as to obtain the median relationship between the upper and lower jaws and the face scan digital information after face scan registration, which is used to determine the position relationship between the upper and lower jaws, such as Figure 4-5 shown.

[0082] S4. A digital model of a trial tooth tray is established according to the digital information of the face scan. The digital model of the trial tooth tray includes a second maxillary tray model, a second mandibular tray model and a Gothic bow tracing model. The labial side of the second maxillary tray model is designed with a plurality of anterior teeth. The Gothic bow tracing model includes an upper Gothic bow model and a lower Gothic bow model which are detachably connected to the second maxillary tray model and the second mandibular tray model, respectively. A tracing needle is provided on the lower Gothic bow model, and a flat plate for cooperating with the tracing needle is provided on the upper Gothic bow model.

[0083] In step S4, the digital models of the standard parts of the upper Gothic bow and the lower Gothic bow are imported into the digital model design software, and the digital models of the standard parts of the upper Gothic bow and the lower Gothic bow are adjusted according to the second maxillary tray model and the second mandibular tray model. After the adjustment, the upper Gothic bow model and the lower Gothic bow model that can be worn in the mouth are formed. In order to realize the detachable connection between the upper and lower Gothic bows and the second upper and lower mandibular trays, it is also necessary to design the second maxillary tray model and the upper Gothic bow model in the software to design mutually matching buckles, and to design mutually matching buckles on the second mandibular tray model and the lower Gothic bow model. Step S5 After the second upper and lower mandibular trays and the upper and lower Gothic bows are printed and formed, the second upper and lower mandibular trays can be directly connected to the upper and lower Gothic bows respectively by buckle connection. In order to ensure the fixing effect, on the basis of the buckles, screws can be further used for connection to ensure stability.

[0084] In the traditional denture preparation process, the patient cannot see the aesthetic state of exposed teeth until the last moment when he puts on the full denture. If the patient is not satisfied, there is no way to adjust it, or scrap the entire set of final dentures and re-order them. In order to solve this problem, in step S4, six front teeth are directly designed when designing the second maxillary tray model. After the second maxillary tray is printed, it can be printed out together with the front teeth. The upper front teeth are used to observe aesthetic elements such as fullness, the amount of exposed front teeth, the shape of the front teeth, and the midline. After the patient wears it in his mouth and smiles, he can preview the aesthetic state of exposed teeth after wearing the full denture in advance. If he is not satisfied with the exposed tooth state, he can make further fine adjustments in the subsequent step S6 digital design of the full denture, so that the final denture prepared can meet the patient's aesthetic needs to the greatest extent.

[0085] S5, the components of the trial tooth tray digital model (i.e., the second maxillary tray model, the second mandibular tray model, the upper Gothic arch model, and the lower Gothic arch model) are integrally printed using materials such as resin or polylactic acid to form a trial tooth tray consisting of the second maxillary tray 41, the second mandibular tray 42, the upper Gothic arch 43, and the lower Gothic arch 44, such as Figure 6-12 shown.

[0086] The upper Gothic bow 43 and the lower Gothic bow 44 are both provided with a U-shaped body 431 and a crossbar 432 connected across the two ends of the U-shaped body 431, and the crossbar 432 is higher than one end face of the U-shaped body 431; the second upper jaw tray 41 and the second lower jaw tray 42 are provided with a slot 433 for accommodating the crossbar 432 on both sides of the occlusal end face, and the slot 433 cooperates with the crossbar 432 to realize the rapid fixation of the Gothic bow assembly and the tray. A tracing board 438 is provided in the middle of the crossbar 432 of the upper Gothic bow 43, and a threaded hole 435 is provided in the middle of the crossbar 432 of the lower Gothic bow 44 for installing a tracing needle 441.

[0087] The U-shaped body 431 is provided with a plurality of raised positioning posts 434, and the occlusal end surfaces of the second maxillary tray 41 and the second mandibular tray 42 are provided with a plurality of positioning holes 435 that match the positioning posts 434. When the upper Gothic arch 43 (or the lower Gothic arch 44) is installed on the second maxillary tray 41 (or the second mandibular tray 42), the relative position of the upper Gothic arch 43 (or the lower Gothic arch 44) and the second maxillary tray 41 (or the second mandibular tray 42) can be quickly positioned by matching the positioning posts 434 with the positioning holes 435, so as to ensure the position accuracy of the Gothic arch tracing device when it is installed in the mouth, and further ensure the accuracy of the horizontal jaw position relationship.

[0088] A protruding connecting column 436 is provided in the slot 433, and through holes 437 are provided on both sides of the upper Gothic bow 43 and the lower Gothic bow 44 to engage with the connecting column 436. The through hole 437 of the upper Gothic bow 43 (or the lower Gothic bow 44) is interference-fitted with the connecting column 436 of the second upper jaw tray 41 (or the second lower jaw tray 42) to achieve a fixed connection between the tray and the Gothic bow. In another optional embodiment, in order to further ensure the stability of the connection between the tray and the Gothic bow, the connecting column 436 can be designed as a threaded column, and after the through hole 437 of the upper Gothic bow 43 (or the lower Gothic bow 44) passes through the threaded column, it is locked with a nut to achieve a more secure connection between the tray and the Gothic bow.

[0089] The present invention has a plurality of matching structures for the gabion assembly and the tray, namely: 1) the slot 433 matches the crossbar 432; 2) the positioning column 434 matches the positioning hole 435; 3) the connecting column 436 matches the through hole 437. The relative position of the gabion assembly and the tray can be quickly located to ensure the position accuracy of the gabion recording device installed in the mouth, thereby ensuring the accuracy of the horizontal jaw position relationship.

[0090] In an optional embodiment, six front teeth 411 are integrally formed on the labial side of the second maxillary tray 41 to simulate the tooth-revealing state of the patient when smiling.

[0091] In one embodiment, the tracing needle 441 can be integrally formed with the lower Gothic bow 44, or the tracing needle 441 and the lower Gothic bow 44 can be designed as two separate parts, which can be manufactured separately and then fixed to the lower Gothic bow 44. For example, the tracing needle 441 can be fixedly connected to the lower Gothic bow 44 by means of threads.

[0092] The upper Gothic arch 43 and the lower Gothic arch 44 are respectively mounted on the second upper jaw tray 41 and the second lower jaw tray 42. Figure 11-Figure 12After the inner surfaces of the second maxillary tray 41 and the second mandibular tray 42 in contact with the alveolar ridge are filled with silicone rubber, they are placed in the patient's mouth to make a closed-mouth impression. The patient's mandible moves forward and laterally, so that the tracing needle 441 traces the patient's mandibular movement trajectory on the flat tracing board 438 of the upper Gothic arch 43.

[0093] S6, scanning the final impression of the closed-mouth impression and combining it with the motion trajectory, generating the final accurate upper and lower jaw soft tissue model 50 in the digital model design software, and then importing the digital model 60 of the finished dentition into the upper and lower jaw soft tissue model 50, as shown in FIG. Fig.13 Then, the base 70 is designed in the software, as shown in FIG. Fig.14 Then, the upper and lower jaw soft tissue models 50 are removed to obtain a digital model of the complete denture, for example Fig.15 The design process of the digital model 80 for the maxillary final denture is as follows Figure 13-Figure 15 shown.

[0094] S7, such as Fig.16 As shown, the maxillary final denture digital model 80 is fitted into the mold box digital model 90, the maxillary denture digital model 80 is subtracted from the mold box digital model 90, and a cavity having the outline of the maxillary final denture digital model 80 is formed in the mold box digital model.

[0095] S8, using the connecting line of the necks of the teeth as a tangent line, the mold box digital model 90 is divided into an upper mold box digital model 91 and a lower mold box digital model 92, as shown in FIG. Fig.16 As shown, the segmented lower mold box digital model 92 is provided with a dentition groove 921, as shown in FIG. Fig.17 shown.

[0096] S9, the upper and lower mold box digital models are printed and formed respectively. The contact end surfaces of the printed upper mold box 94 and the lower mold box 95 are provided with mutually engaged steps 93, so that the two can ensure good positioning and sealing matching relationship after the mold is closed. Then, the prefabricated finished teeth 97 are placed into the tooth row groove 921 of the lower mold box 95, as shown in FIG. Fig.18 The upper mold box 94 is sealed and buckled on the lower mold box 95 and is fixed with a clamping device (not shown in the figure) (such as Fig.19 As shown), the base material is then injected into the mold box cavity after the mold is closed, and after the base material is cooled and formed, the upper mold box 94 is opened, and the maxillary final denture 101 consisting of the tray and the finished dentition is formed in the lower mold box 95, as shown Fig. 20 As shown. Since the tray is integrally formed by injection molding, it can greatly enhance the bonding strength with the finished dentition, increase the strength of the denture and prevent the dentition from falling off.

[0097] The mold box of the present invention is initially designed with an injection hole and an exhaust hole, the base material is injected through the injection hole, and the exhaust is exhausted through the exhaust hole during the injection process.

[0098] S10, repeat steps S7-S9 to prepare the mandibular final denture 102, such as Figure 21-22 As shown, the process is the same as the preparation process of the maxillary final denture 101, and will not be repeated here.

[0099] This method introduces facial scanning into the data collection of the initial visit. The personalized trial tooth tray (i.e., the digital model of the trial tooth tray with the front teeth) is designed based on the facial scanning and the impression for the first time. The closed-mouth impression is made at the second visit (step S5), and the vertical and horizontal jaw position relationship is determined. After that, the denture is precisely processed by the digital method, and a pair of close-fitting and comfortable full-mouth dentures can be worn at the third visit. In addition, the full-process digital processing method improves the production accuracy and efficiency of full-mouth dentures, reduces the errors that may occur in the traditional manual production process, makes the personalized design of dentures more accurate, and makes the clinical operation more standardized and consistent. The patient's comfort is improved, and the processing time and difficulty are greatly reduced.

[0100] Embodiment 2

[0101] The steps of this embodiment are used to fine-tune the manufactured complete denture to ensure that the complete final denture has a good occlusal fit. The specific steps are as follows:

[0102] First, in step S7, in the design software of the mold box digital model, firstly, the outer surface of the lower mold box digital model 92 of the maxillary final denture and the outer surface of the lower mold box digital model 92 of the mandibular final denture are designed with a first positioning mechanism 96 in the form of a buckle, such as Fig.25 The first positioning mechanism 96 is formed integrally with the main body of the lower mold box during the printing process of the lower mold box 95. Since the positioning mechanism is located on the outer surface of the lower mold box 95, it will not affect the manufacturing form of the final denture inside the mold box.

[0103] After the final denture is prepared by injection molding in the upper and lower mold boxes, the upper mold box 94 is opened to obtain the following Fig. 20 The lower mold box 95 with the maxillary final denture 101 and Fig. 22 The lower mold box 95 with the mandibular final denture 102 is shown.

[0104] Then, the two lower mold boxes 95 loaded with the maxillary final denture and the mandibular final denture are fixed to an occlusal adjustment fixture 110, such as Fig.23As shown, the bite adjustment fixture 110 is provided with an upper fixture 111 and a lower fixture 112 which can rotate relative to each other. The upper fixture 111 and the lower fixture 112 are provided with a second positioning mechanism 114. The two lower mold boxes are respectively precisely positioned and connected with the second positioning mechanisms 114 of the upper fixture 111 and the lower fixture through the first positioning mechanism 96 on the outer surface. Fig.23 shown.

[0105] Adjust the upper clamp 111 and the lower clamp 112 to simulate the occlusal relationship between the upper and lower jaws so that the maxillary final denture 101 and the mandibular final denture 102 form an occlusion, and then use the locking device 113 to fix the upper clamp 111 and the lower clamp 112, and properly grind the maxillary final denture 101 and / or the mandibular final denture 102 to meet the intra-oral occlusal state requirements, and grind the redundant dentition that affects the occlusion of the full denture to avoid improper occlusion of the full denture due to improper coordination of individual upper and lower teeth.

[0106] Embodiment 3

[0107] The steps of this embodiment are used to fine-tune the manufactured complete denture to ensure that the mandibular complete final denture has a good occlusal fit. The difference from the second embodiment is that this embodiment can fine-tune the complete denture without the aid of an auxiliary fixture.

[0108] like Figure 27-28 As shown, first in step S7, in the design software of the mold box digital model, the hinge model 98 is fitted with the lower mold box digital model 92 of the upper and lower final dentures, and the hinge model is composed of a split upper hinge model and a lower hinge model. After the lower mold box digital model 92 of the upper and lower final dentures is printed, an upper hinge 98-1 and a lower hinge 98-2 are formed on one side respectively. The upper hinge 98-1 and the lower hinge 98-2 are connected together, thereby realizing the rotation connection of the two lower mold boxes 95 of the maxillary final denture and the mandibular final denture together.

[0109] Then, the two lower mold boxes 95 are rotated relative to each other to simulate the occlusal relationship between the upper and lower jaws, so that the maxillary final denture 101 and the mandibular final denture 102 form an occlusion, and the maxillary final denture 101 and / or the mandibular final denture 102 are appropriately polished to meet the intraoral occlusal state requirements, and the redundant dentition that affects the occlusion of the upper and lower jaws is polished to avoid improper occlusion of the full mouth final denture due to improper coordination of individual upper and lower teeth.

[0110] Embodiment 4

[0111] In this embodiment, a metal base plate may be embedded in the maxillary final denture to improve strength. The specific steps are as follows:

[0112] In step S6 of the first embodiment, a metal base plate model 120 matching the digital model of the maxillary final denture is designed. Fig.29 The metal base plate model 120 is fitted with the maxillary final denture digital model to obtain a metal plate maxillary final denture model.

[0113] In step S7, the metal sheet final maxillary denture model is fitted into the mold box digital model, and the metal sheet final maxillary denture model is subtracted from the mold box digital model to form a cavity with the contour of the metal sheet final maxillary denture model in the mold box digital model.

[0114] In step S9, after the upper and lower mold boxes are printed and formed, the prefabricated finished teeth are first placed in the tooth row groove of the lower mold box, and then the printed metal base plate is placed in the lower mold box, such as Fig.30 As shown, the upper and lower mold boxes are then molded together (as shown Fig.31 ) and injection molding is performed in the cavity to form a base with a metal base plate embedded in it and tightly combined with the finished tooth, forming a maxillary final denture containing a metal plate, such as Fig.32 shown.

[0115] The design and manufacturing process of the other half-denture is the same and will not be described here.

[0116] In this embodiment, the base part with the metal bottom plate is formed by injection molding, which greatly improves the bonding strength between the finished tooth and the metal plate, thereby ensuring the strength of the base.

[0117] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A method for making digital complete dentures, characterized in that: The production method comprises the following steps: S1. Obtain digital information of the intraoral soft tissues of the upper and lower jaws and establish a digital model of the intraoral soft tissues; S2. Establishing a digital model of a face scanning tray according to the digital model of the intraoral soft tissue, wherein the digital model of the face scanning tray comprises a first maxillary tray model and a first mandibular tray model, wherein the first maxillary tray model is integrally formed with a registration tray model extending outside the mouth, and the registration tray model is provided with marking points on the part outside the mouth; S3, printing and forming the digital model of the face scan tray and placing it in the patient's mouth, and obtaining the median relationship between the upper and lower jaws and the digital face scan information after face scan registration by optically scanning the registration tray outside the mouth; S4, establishing a digital model of a trial tooth tray according to the digital face scan information, wherein the digital model of the trial tooth tray includes a second maxillary tray model, a second mandibular tray model, and a Gothic bow tracing model, wherein a plurality of anterior teeth are arranged on the labial side of the second maxillary tray model, and the Gothic bow tracing model includes an upper Gothic bow model and a lower Gothic bow model which are detachably connected to the second maxillary tray model and the second mandibular tray model, respectively; S5, respectively printing out the digital models of the trial tooth trays, installing the upper Gothic arch and the lower Gothic arch on the second maxillary tray and the second mandibular tray respectively, filling the inner surfaces of the second maxillary tray and the second mandibular tray in contact with the alveolar ridge with silicone rubber, and then placing them in the patient's mouth to make a closed-mouth impression, and the patient's mandible moves forward and laterally, and the patient's movement trajectory is traced on the plane plate of the upper Gothic arch to determine the position of the horizontal jaw position relationship; S6. Scan the final impression of the closed-mouth impression and design and generate the digital models of the maxillary and mandibular half-mouth final dentures respectively in combination with the horizontal jaw position relationship; S7, fitting the digital model of the half-mouth final denture into the digital model of the mold box, subtracting the digital model of the half-mouth final denture from the digital model of the mold box, and forming a cavity having the outline of the digital model of the half-mouth final denture in the digital model of the mold box; S8, dividing the mold box digital model into two upper and lower mold box digital models, wherein the lower mold box digital model is provided with a tooth row groove; S9, the upper and lower mold boxes are digitally printed and formed respectively, and the prefabricated finished teeth are placed into the tooth groove of the lower mold box, and then the upper and lower mold boxes are molded together and the base material is injected into the cavity, and the base and the finished teeth are tightly combined as the maxillary final denture or the mandibular final denture; S10. Repeat steps S7-S9 to prepare another set of final dentures.

2. A method for making digital complete dentures as claimed in claim 1, characterized in that: In step S1, the method for obtaining digital information of the intraoral soft tissues of the upper and lower jaws is as follows: Insert the digital oral impression device into the patient's mouth to scan the inside of the mouth to obtain digital information of the intraoral soft tissues of the upper and lower jaws.

3. A method for making digital complete dentures as claimed in claim 1, characterized in that: In step S1, the method for obtaining digital information of the intraoral soft tissues of the upper and lower jaws is as follows: The inner surfaces of the maxillary and mandibular impression trays that contact the alveolar ridge are filled with silicone rubber and then placed in the patient's mouth to make a closed-mouth impression. The initial impression of the closed-mouth impression is taken out and optically scanned to obtain digital information on the intraoral soft tissues of the maxillary and mandibular regions.

4. A method for making digital complete dentures as claimed in claim 1, characterized in that: In step S3, the inner surfaces of the first maxillary tray and the first mandibular tray that are in contact with the alveolar ridge are filled with silicone rubber and then placed in the patient's mouth.

5. A method for making digital complete dentures as claimed in claim 1, characterized in that: In step S4, the digital models of the standard parts of the upper Gothic bow and the lower Gothic bow are imported into the digital model design software, and the digital models of the standard parts of the upper Gothic bow and the lower Gothic bow are adjusted according to the second maxillary tray model and the second mandibular tray model. After the adjustment, the upper Gothic bow model and the lower Gothic bow model are formed, and the second maxillary tray model and the upper Gothic bow model are designed to match the connecting mechanisms, and the second mandibular tray model and the lower Gothic bow model are designed to match the connecting mechanisms; In step S5, after the second maxillary tray model, the second mandibular tray model, the upper Gothic bow model, and the lower Gothic bow model are printed and formed respectively, the upper Gothic bow and the lower Gothic bow are installed on the second maxillary tray and the second mandibular tray respectively.

6. A method for making digital complete dentures as claimed in claim 5, characterized in that: The upper Gothic bow and the lower Gothic bow are both provided with a U-shaped body and a crossbar connected across the two ends of the U-shaped body, the crossbar is higher than one end surface of the U-shaped body, a tracing board is provided in the middle of the crossbar of the upper Gothic bow, and a threaded hole is provided in the middle of the crossbar of the lower Gothic bow; slots for accommodating the crossbar are respectively provided on both sides of the occlusal end surfaces of the second upper jaw tray and the second lower jaw tray; A protruding connecting column is provided in the card slot, and connecting holes matching with the connecting column are provided on both sides of the upper Gothic bow and the lower Gothic bow; The U-shaped main body is provided with a plurality of protruding positioning columns, and the occlusal end surfaces of the second maxillary tray and the second mandibular tray are both provided with a plurality of positioning holes matched with the positioning columns.

7. A method for making digital complete dentures as claimed in claim 1, characterized in that: In step S8, the digitized mold model is divided into two upper and lower digitized mold models using the connecting line of the necks of the teeth as a tangent.

8. A method for making digital complete dentures as claimed in claim 1, characterized in that: The method further comprises embedding a metal base plate in the maxillary final denture, and the specific steps are as follows: In step S6, a metal base plate model is digitally designed, and the metal base plate model is fitted with the digital model of the maxillary final denture to obtain a metal plate half-mouth final denture model; In step S7, the metal plate half-mouth final denture model is fitted into the mold box digital model, the metal plate half-mouth final denture model is subtracted from the mold box digital model, and a cavity having the contour of the metal plate half-mouth final denture model is formed in the mold box digital model; In step S8, the mold box digital model is divided into two upper and lower mold box digital models, and the lower mold box digital model is provided with a tooth row groove; In step S9, the digital models of the upper and lower mold boxes are printed separately, and after the prefabricated finished teeth are placed in the tooth grooves of the lower mold box, the printed metal base plate is placed in the lower mold box. Subsequently, the upper and lower mold boxes are molded together and injection molding is performed in the cavity to form a base with a metal base plate embedded in it and tightly combined with the finished teeth, thereby forming a maxillary final denture.

9. A method for making digital complete dentures as claimed in claim 1, characterized in that: The contact end surfaces of the upper and lower mold boxes are provided with steps that engage with each other; In step S9, after the upper and lower mold boxes are molded together, the upper and lower mold boxes are fastened and sealed together using a clamping device.

10. The method for making a digital complete denture according to claim 1, characterized in that: The method further comprises: fine-tuning the formed complete denture, the steps comprising: In step S7, the following steps are performed: designing a positioning mechanism on the outer surface of the digital model of the lower mold box; After step S10 is completed, the following steps are performed: S11. After the injection molding of the half-mouth final dentures of the maxilla and the mandible is completed, the upper mold box is opened, and the two lower mold boxes loaded with the maxillary final dentures and the mandibular final dentures are fixed to an occlusal adjustment fixture, wherein the occlusal adjustment fixture is provided with an upper fixture and a lower fixture that can rotate relative to each other up and down, and the two lower mold boxes are respectively accurately positioned and connected with the upper fixture and the lower fixture through the positioning mechanism on the outer surface; S12. Adjust the upper and lower clamps to make the maxillary final denture and the mandibular final denture occlude, fix the upper and lower clamps, and adjust the maxillary final denture and the mandibular final denture to meet the intraoral occlusal state requirements.

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