WO2020082520A1

WO2020082520A1 - Cad/cam digital manufacturing method for support-type movable denture

Info

Publication number: WO2020082520A1
Application number: PCT/CN2018/119686
Authority: WO
Inventors: 邢浩
Original assignee: 邢浩
Priority date: 2018-10-24
Filing date: 2018-12-07
Publication date: 2020-04-30
Also published as: CN109223218A; CN109223218B

Abstract

A CAD/CAM digital manufacturing method for a formwork-type movable denture, comprising the follow steps: 1) obtaining data: scanning a tooth working model to obtain A data required for CAD design; 2) CAD design: CAD designing a formwork structure B, forming A+ data required for the design of teeth and a base, CAD designing a tooth structure C and a base shape, forming A++ data required for the design of a base mold shell, and CAD designing a base mold shell structure D; 3) CAM manufacturing: extracting three types of data such as the formwork structure B, the tooth structure C, the base mold shell structure D for CAM typesetting, CAM cutting, and then lost wax casting to obtain the formwork structure B, CAM cutting to obtain the tooth structure C, and 3D printing to obtain the base mold shell structure D; 4) injection molding; 5) grinding and polishing. The formwork-type movable denture is simple to manufacture, has high precision and short manufacturing cycle, reduces production cost, and improves the quality of the movable denture restoration.

Description

Digital manufacturing method of CAD / CAM of scaffold movable denture

Technical field

The invention relates to the technical field of manufacturing a stent-type movable denture, in particular to a CAD / CAM digital manufacturing method of a stent-type movable denture.

Background technique

Movable dentures are used to repair missing dentures and dentition defects. Among them, the repair of missing dentition refers to full dentures, and the repair of missing dentition refers to removable partial dentures.

At present, CAD / CAM digital denture manufacturing technology is widely used in the field of oral fixed dentures and implant dentures due to its delicate design, accurate manufacturing and comfortable use. However, due to the lack of dentition and many types of dentition defect, the movable denture usually consists of three components: bracket, tooth, denture, and base. The three components are composed of three different types of materials, which is difficult The manufacturing is completed with a single device and process, so the movable denture in the prior art is still in the traditional hand-made mode stage.

Movable denture brackets are widely used in the field of traditional movable denture production because of their flexible design, small foreign body sensation, and good biocompatibility. The stent-type movable denture repair occupies a dominant position in movable denture repair.

However, the manufacturing process of traditional stent-type movable dentures is complicated. First of all, the stent manufacturing part mainly includes: filling the concave, remaking the refractory model, stent wax design, embedding casting, stent polishing and other steps. After the bracket is completed, put it on the model (hinge) rack, arrange teeth, engrave the shape of the base, box, wax, apply the separating agent, fill the glue, heat treatment, open the box and polish it. Due to the complicated manufacturing process, cumbersome steps, long production cycle, and difficulty in arranging teeth, the level of manual production is uneven, and the error is large. The quality of the movable denture restoration is difficult to control, resulting in the restoration of movable dentures completed by traditional manufacturing processes The body weight is generally poor, the satisfaction of patients wearing and using is not high, and the high labor production cost also increases the economic burden of patients.

At present, China has entered an aging society, and the main users of movable dentures are mostly the elderly. Therefore, it is especially necessary to develop a high-efficiency, low-cost, stent-type movable denture production method that can improve the quality of movable denture restorations and satisfy more users.

Summary of the invention

The present invention is to overcome the above-mentioned shortcomings of the prior art, and provides a CAD / CAM digital manufacturing method of a stent-type movable denture; the solution of the invention adopts a stent-type movable denture repair method, and the maxillary dentition in the technical solution of the invention The missing and mandibular dentition defect movable denture restorations are composed of three components: bracket, tooth and base. Compared with the prior art, the scaffold movable denture of the present invention has less artificial reliance, simple manufacture, high accuracy and short production cycle, which reduces the production cost and improves the quality of the movable denture restoration.

The technical solutions adopted by the present invention to solve its technical problems are:

A digital manufacturing method for CAD / CAM of a stent-type movable denture includes the following steps:

1) Prepare data:

According to the dental working model, use the dental model scanner to scan the oral model to prepare the A data required for CAD design;

2) CAD design:

Use the denture design software to design the bracket structure B of the movable denture on the A data, and save the bracket structure B data in STL format;

Use denture design software to form A + data containing A data and stent structure B as a whole, and save A + data in STL format;

Use the denture design software to design the tooth structure C on the A + data, and save the tooth structure C data in STL format;

Further complete the design of the dental base;

Use denture design software to form A ++ data containing A data, scaffold structure B, tooth structure C and base as a whole, and save A ++ data in STL format data;

Use the denture design software to design and complete the base mold structure D on the A ++ data, and save the base mold structure D data in STL format;

3) CAM production:

Extract the three data of bracket structure B, tooth structure C, and base mold shell structure D, CAM layout, and then use casting to get the bracket structure B, CNC cutting to get the tooth structure C, 3D printing method to get the base mold shell structure D;

4) Injection molding:

First put the support structure B on the working model, then put the tooth structure C in the base mold shell structure D, and then put the working model with the support structure B and the base mold shell with the tooth structure C Structure D is matched and matched, and the edges are fixed by injection molding;

5) Polishing and polishing:

First remove the working model and the base mold shell structure D to obtain the overall movable denture, then grind away the injection hole, exhaust hole and excess resin on the edge of the base, and polish the final movable denture restoration.

The step 1) specifically includes: first, use a dental three-dimensional scanner to scan the working model using a bilateral plaster model scanning mode, and then sequentially scan the full bite model, mandibular plaster model, and maxillary plaster model, and then the software automatically matches the upper and lower jaw models , Scan to obtain three-dimensional A data of upper and lower jaws consistent with the working model bite, and then save the upper jaw model data one and mandible model data two in STL format.

The stent design in step 2) first uses denture design software to create orders in the stent mode, designing the upper jaw stent 1 and the lower jaw stent 2, and then saving the data of the upper jaw stent 1 and the lower jaw stent 2 in STL format;

The A + data model in the above step 2) uses denture design software to save the maxillary data model 1 and the mandibular data model 2 containing the stent structure as a whole, forming the maxillary A + data model and the mandible A + data model, and then save them in STL format;

The tooth design in step 2) uses denture design software, uses the anatomical missing tooth model to create orders, extracts the upper and lower jaw A + data model for tooth arrangement design; according to the remaining tooth shape, the tooth selects the tooth shape in the tooth database that is similar to the remaining tooth shape Perform tooth arrangement design, then adjust the position, size and shape of the maxillary and mandibular teeth in sequence according to the tooth arrangement design process, set the distance of the teeth from the gums, set the contact distance with the adjacent teeth, complete the design of the maxillary and mandibular teeth, and then in STL format Save the upper jaw tooth data one by one, and the lower jaw tooth data two by one;

In the step 2) of the base design, based on the completion of the tooth arrangement design, use the gingival pattern design software in the denture design software to design the base, set the maxillary base thickness, neck base thickness, and the base edge The margin covers the maxillary nodules, the buccal edge to the mucosal turning point, and the lingual edge to the end of the stent; set the thickness of the mandible base, set the thickness of the neck base, the base of the base covers the molar back pad, and the tongue edge The bottom of the tongue is aligned with the end line of the stent, and the buccal edge to the mucosal turning point; after designing the range of the maxillary and mandibular bases, the base is bionicly adjusted according to the gum anatomy to complete the base design;

The A ++ data model in step 2) uses denture design software to save the upper and lower jaw data models containing the bracket, teeth, and base structure as a whole, forming the upper jaw A ++ data model 2 and the lower jaw A ++ data model 3, and then in STL format. save.

The base mold design in step 2) uses denture design software to build the order with the occlusal splint module, and extract the maxillary A ++ data model and the mandible A ++ data model respectively, and then design according to the missing type of maxilla and mandible; set the maxilla The bottom gap of the base mold shell is set, the thickness of the mold shell is set, and the edge line is set to exceed the edge of the base. The injection hole is designed at the incisor mastoid of the maxillary base mold shell, and the vent holes are provided at the upper nodules on both sides. The design is completed Then save the maxillary base mold shell data in STL format; set the bottom gap of the mandible base mold shell, set the thickness of the mold shell, the edge line is set to exceed the edge of the base plate, the adjacent tooth exceeds one tooth position, and the injection hole is designed on the tongue side , Corresponding to the design of the vent hole on the buccal side, after the design of the base mold shell, the data of the mandible base mold shell is saved in STL format.

In the step 3), the prosthesis making software uses denture typesetting software, extracts the upper and lower jaw support data, uses the support module for layout design, and then uses a denture cutting machine to cut the upper jaw support wax pattern and the lower jaw support wax pattern, using the lost wax method Casting process, casting, grinding and polishing to complete the upper cobalt chromium metal bracket and lower mandible cobalt chromium metal bracket;

In step 3), the teeth are made using denture typesetting software, which extracts the data of the upper and lower jaw teeth, and uses the full crown module for layout design, and then uses the denture cutting machine to cut the upper jaw and lower jaw teeth by CNC, and grind the excess connecting rod to complete the tooth production;

In the step 3), the denture mold making software uses denture typesetting software to extract the data of the maxillary and mandibular base mold shells for layout design, and uses a 3D printer and soft photo-curable resin to print the maxillary base mold shell and mandibular base. Pallet shell.

The specific steps of injection molding in the step 4) include: first, the upper jaw cobalt-chromium metal bracket is placed on the upper jaw working model, and the lower jaw cobalt-chromium metal bracket is placed on the lower jaw working model;

Position the maxillary teeth in the maxillary base mold shell and the mandible teeth in the lower jaw base mold shell;

Match the maxillary working model and the maxillary base mold shell into the structure to be injected; match the mandible working model and the mandible base mold shell into the structure to be injected; the model and the mold shell edge are fixed with an adhesive;

Use injection base resin, adjust the base resin in the vessel, and then pour into the syringe. When the resin is polymerized into the thinner, align the syringe mouth with the injection hole of the maxillary palate side and inject the resin. The vent hole of the maxillary nodule has Complete maxillary injection when the resin flows out completely;

Align the syringe with the injection hole on the lingual side of the mandible and inject resin, and complete injection of the mandible when the resin is completely discharged from the vent hole on the buccal side of the mandible;

Put the model after injection molding into an injection pressure cooker with a temperature of 55 ° C, maintain the pressure of 2.5 MPa, polymerize and mold within 30 minutes, take it out and cool down naturally to complete injection molding.

The grinding and polishing in the step 5) includes the following steps: first, the maxillary base mold shell and the bottom plaster working model are removed to obtain the overall movable denture of the upper jaw, and different types of grinding heads are used for grinding according to the grinding principle from coarse grinding to fine grinding Injection hole, vent hole and excess resin on the edge of the base, and then use wet and dry cloth wheels to polish the maxillary movable denture restoration;

Remove the mandibular base mold shell and the bottom working plaster model to obtain the whole mandibular movable denture. According to the grinding principle from coarse grinding to fine grinding, different types of grinding heads are used in order to remove the excess resin from the injection hole, exhaust hole and the edge of the base Then, use wet and dry cloth wheels to polish the mandibular movable denture restoration.

The beneficial effects of the present invention are:

1: The stent-type movable denture of the present invention adopts the CAD / CAM digital design and manufacturing method, manual injection molding, and manual grinding and polishing. The entire process has less manual dependence and high manufacturing accuracy, which solves the complex structure of movable dentures in the prior art. , The process is cumbersome, completely dependent on manual production, which has the problems of large errors, long production cycle, high labor cost, and poor quality of movable denture restorations, which reduces the production cost and improves the quality of movable denture restorations.

2: The CAD / CAM digital manufacturing technology of the stent-type movable denture of the present invention has completely changed the most complicated and most difficult artificial tooth arranging link in the movable denture manufacturing technology. The traditional artificial tooth arranging is often subject to the single artificial tooth model and movable denture working model Due to the complexity and other conditions, most artificial teeth need to be polished and adjusted. Therefore, artificial teeth are not only inefficient but also ineffective. The teeth in the stent-type digital movable denture of the present invention are designed with CAD, and the tooth shape can be quickly and personalized. Aesthetic design, completely get rid of the problem of the traditional single-shaped artificial tooth shape, artificial grinding and modification of poor aesthetics, dental CAD design improves the speed of tooth arrangement, and enhances the aesthetics of the tooth; after the CAD design of the tooth is completed, it is produced by CAM and CNC Cutting teeth not only ensures the accuracy of the teeth, but also improves the speed of making dentures.

3: The CAD design of the base mold shell in the present invention, 3D printing the base mold shell, and then the manual injection molding method is a necessary link to realize the digital stent-type movable denture. The stent-type movable denture is the stent, tooth, base, three All kinds of components are organically integrated into one body to restore the missing tissue of the patient's mouth, but in the existing denture production technology, 3D printing and CNC cutting methods cannot produce a base that can be embedded with a stent-retaining mesh, and the digital manufacturing technology of stent-type movable dentures lags behind It is also derived from this; the invention adopts CAD design and 3D printing to complete the base mold shell, and then artificially injection molds the denture base, which not only accurately mounts the bracket retention mesh in the base, but also accurately connects the base and the teeth. , The three are perfectly combined into one, the whole process is simple to operate, with high accuracy and low error, and the injection molding method can be applied to the restoration of dentition defect or missing dentition movable denture, which is more conducive to the support type movable denture CAD / CAM Wide application of digital production methods.

4 The difference between the manual grinding and polishing of the present invention and the traditional manual grinding and polishing is that after the base denture shell injection molding method is used to obtain the overall denture, after removing the base bracket mold shell and the working model, it is only necessary to simply grind the injection hole, the exhaust hole and the base A small amount of resin spilled from the edge of the bracket and then polished to complete the final movable denture restoration. The whole process is simple, efficient and accurate.

5: With the popularization and rapid development of digital technology, adopting the digital manufacturing method of the mobile denture of the present invention can realize mass production and low cost manufacturing. The application and promotion of the present invention can not only bring gospel to more mobile denture patients, In addition, it has a certain promotion effect in the related fields of digital production of movable dentures and has a wide range of social benefits.

BRIEF DESCRIPTION

Figure 1: Working model of bracket movable denture;

Figure 2: Schematic diagram of the data preparation of the stent-type movable denture;

Figure 3: Design of bracket-type movable denture bracket, A + model diagram;

Figure 4: Schematic diagram of the design of bracket-type movable denture teeth;

Figure 5: Schematic design of bracket-type movable denture base, A ++ model;

Figure 6: Schematic diagram of the design of the stent-type movable denture base bracket;

Figure 7: Schematic diagram of the production of a bracket-type movable denture bracket;

Figure 8: Schematic diagram of the production of bracket-type movable denture teeth;

Figure 9: Schematic diagram of the production of a bracket-type movable denture base support mold shell;

Figure 10: Schematic diagram of injection molding of bracket-type movable denture;

Figure 11: Schematic diagram of the completion of the scaffold movable denture restoration.

detailed description

In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only a part of the embodiments of the present invention, but not all the embodiments.

As shown in FIGS. 1-11, based on the dentition loss and dentition defect in the type of stent-type movable denture repair, in order to enable those skilled in the art to better understand the technical solutions in the present invention and the technical solutions in the present invention For a clear and complete description, as shown in FIG. 1, the embodiment of the present invention adopts a maxillary 1 dentition loss, a mandibular 2 dentition defect, and 17-27, 35, 36, 46, 47 teeth with upper and lower bite Working model of relationship.

One: make data

First, use the dental 3D scanner to scan the working model using the bilateral plaster model scanning mode, and then scan the full occlusal model, mandibular plaster model, and maxillary plaster model in turn, and then the software automatically matches the upper and lower jaw models, as 1, 2 in Figure 2 As shown, after the scan is completed, the three-dimensional data of the upper and lower jaws consistent with the working model's jaw bite are obtained, and then the upper jaw data model one 1 and the lower jaw data model two 2 are respectively saved in the STL format.

Two: CAD design

1: Bracket design

Use the denture design software to create a single order in the scaffold mode, and extract the upper and lower jaw STL data models for scaffold design.

As shown in 1,2,3,4 in Figure 3, the upper jaw is designed in order according to the type of dentition loss, and then the maxillary stent 1-1 is completed after the termination line; the mandible is designed in order according to the dentition defect. , Tongue bar, small connecting body, snap ring, terminating line, complete the mandibular bracket II 2. Then save the data of maxillary stent-1 and mandibular stent-2 respectively in STL format;

The denture design software was used to further save the upper and lower jaw data models containing the stent structure to form the upper jaw A + data model 3 and mandible A + data model 4, and then save them in STL format.

2: tooth design

Use the denture design software to build a single anatomical missing tooth model, and then extract the upper and lower jaw A + data model for tooth arrangement design; according to the remaining tooth shape, the tooth is selected from the tooth database similar to the remaining tooth shape for tooth arrangement design, and then according to the tooth arrangement In the design process, the position, size and shape of the upper and lower jaw teeth are adjusted in sequence, the distance from the gums is set at 0.8mm, and the contact distance with the adjacent teeth is set at 0.1mm. As shown in 1,2 in Figure 4, complete the upper and lower jaw teeth design, and then save the upper jaw 17-27 tooth data one by one in STL format, and save the lower jaw 35, 36, 46, 47 tooth data two by one.

3: Keto design

Based on the completion of the tooth arrangement design, the base design is further used to design the gingival pattern in the denture design software for base design. The maxillary base thickness is set at 1.8mm, the neck base thickness is set at 1.2mm, and the base is behind the edge The margin covers the maxillary nodules, the buccal edge to the mucosal transition, the lingual edge to the end of the stent; the thickness of the mandibular base is set at 1.8mm, the thickness of the neck base is set at 1.2mm, and the rear edge of the base is covered with the molar back pad. The lingual edge reaches the bottom of the tongue and is aligned with the end line of the stent, and the buccal edge reaches the mucosal turning point. After designing the upper and lower mandibular bases, further use the functions of increase, decrease and smoothing in the software to adjust the bases bionic adjustment according to the anatomy of the gums to complete the base shape design.

As shown in 1,2,3 in Figure 5, design 1 of the maxillary base and mandible base is completed.

Further, the denture design software was used to save the upper and lower jaw data models containing the stent, teeth, and base structure to form the upper jaw A ++ data model 2 and the lower jaw A ++ data model 3, and then save them in STL format.

4: Design of the base mold shell

Use the denture design software to build the order with the occlusal splint module, extract the maxillary A ++ data model 2 and the mandible A ++ data model 3 in Figure 5 respectively, and then design according to the missing types of the upper and lower jaws.

As shown in 1,2 in Figure 6, the bottom gap of the maxillary base mold shell is set to 0.01mm, the thickness of the mold shell is set to 3.5mm, the edge line is set to exceed the edge of the base plate by 3.00mm, and the maxillary base mold shell cut tooth milk A 4mm injection hole is designed at the protrusion, and a 3mm exhaust hole is provided at the maxillary nodules on both sides. After the design is completed, the data of the maxillary base mold shell 1 is saved in the STL format. The bottom gap of the mandibular base mold shell is set to 0.01mm, the thickness of the mold shell is set to 3mm, the edge line is set to exceed the edge of the base plate by 3mm, the adjacent tooth side exceeds one tooth position, the tongue side is designed with a 2.5mm injection hole, and the corresponding buccal side is designed with 2mm The vent hole, after designing the base mold shell, save the data of the mandible base mold shell 2 in STL format.

Three: CAM production

1: Bracket production

Use the denture typesetting software to extract the upper and lower jaw bracket data, use the bracket module for layout design, and then use a denture cutting machine to cut a 98mmx25 blue wax disk, as shown in 1, 2, 3, 4 in Figure 7, cutting the upper jaw. Stent wax type 1, mandibular wax type 2. Then using the lost wax casting process, the upper jaw uses 24g and the lower jaw uses 18g cobalt-chromium alloy steel. The upper jaw cobalt-chromium metal bracket 3 and the lower jaw cobalt-chromium metal bracket 4 are cast, polished and polished.

CAD design is used in the manufacturing process of the bracket, and then the lost wax casting method is adopted based on the economic and practicality of digital movable dentures. The CAD design and CNC cutting of the bracket wax model completely get rid of the cumbersome manual manufacturing of the bracket wax model and eliminate the production errors. ; The lost wax casting process belongs to precision casting, the existing lost wax casting process technology is very mature, this digital movable denture manufacturing method using CAD / CAM design and manufacturing combined with the lost wax casting process not only guarantees the precision of the bracket And the production cost is low, which is conducive to wide application.

2: Tooth making

Use the denture typesetting software to extract the data of the upper and lower jaw teeth, use the full crown module for layout design, and then use the denture cutting machine, as shown in Figure 8, select A2 color, 98mmx18 specifications gradient color PMMA resin disc, cutting completed 18 upper and lower jaws tooth. Then remove the PMMA resin disc and grind off excess connecting rods to complete the tooth production.

The tooth-cutting material used in this invention is a domestic graded PMMA resin disc. Compared with other types of materials such as zirconia and elastic porcelain dentures, the price and performance of PMMA resins are more suitable for the application in the field of digital movable denture CAD / CAM production. However, due to the relative lag of the digital manufacturing technology of movable dentures CAD / CAM, compared with the denture materials used for fixed dentures and implant dentures, there are fewer machinable materials that can be applied to the field of digital manufacturing of movable dentures CAD / CAM, but with the support of the invention The application and promotion of the digital manufacturing method of mobile removable denture CAD / CAM, in the future there will be more machinable tooth materials used in the field of digital removable denture manufacturing.

3: Manufacture of the base mold shell

Use denture typesetting software to extract upper and lower jaw base mold shell data for typesetting design. As indicated by 1 and 2 in FIG. 9, using a 3D printer and using a soft photo-curable resin, the upper jaw base mold shell 1 and the lower jaw base mold shell 2 are printed.

3D printing technology has long been used in the field of oral denture production. 3D printing technology has been applied in the field of digital production of movable dentures. The performance, accuracy and cost of its technology and materials are fully suitable for the requirements of digital production of movable dentures. With the rapid development of 3D printing technology and the rapid increase in 3D printing speed, it will be possible to fully realize the rapid production of digital mobile dentures in large quantities and at low cost in the future.

Four: injection molding

As shown in 1, 2, 3, 4, 5, 6, a in Figure 10:

First, place the maxillary cobalt-chromium metal bracket on the maxillary working model 1 and the mandible cobalt-chromium metal bracket on the mandibular working model 2;

Further positioning the maxillary teeth in the maxillary base mold shell 3, and the mandibular teeth in the lower jaw base mold shell 4;

Further match the maxillary working model 1 with the maxillary base mold shell 3 into position to be injection-molded 5; match the mandible working model 2 with the mandible base mold shell 4 into position to be injection-molded 6, and the model and mold shell edges are glued The adhesive is solid.

Further select injection-molded base resin, based on the total amount of missing tooth gum resin, according to the ratio of 1.5 g: 1 ml of injection-molded dental powder, mix with 35ml base resin in cups and utensils, and then pour into a 50ml syringe, When the resin is polymerized into the thinner, the injection of the syringe is aligned with the injection hole of the maxillary palate side, and the injection of the maxilla is completed when the resin of the maxillary nodule exhaust hole completely flows out.

Further align the syringe with the injection hole on the lingual side of the mandible and inject the resin. When the resin is completely discharged from the vent hole on the buccal side of the mandible, the injection of the mandible is completed.

Further, after the injection molding, the model is placed in an injection pressure cooker with a temperature of 55 ° C., the pressure is maintained at 2.5 MPa, and the polymerization molding can be carried out within 30 minutes. After taking out, natural cooling completes the injection molding.

The use of injection molding is an essential part of the digitalization of movable dentures. As shown in a of Figure 10, the use of stent-type movable dentures is repaired. There will always be 0.5-0.9mm of space between the stent-retaining mesh design and the bottom gums. The existing 3D printing and numerical control cutting methods can not produce a base that can match the gums, teeth, and brackets, and the lag in digital production of movable dentures also originates from this. The injection molding method is used to inject the flowing resin into the base mold shell and fill the polymer molded base, which not only fully fits the bottom with the gums, but also can be precisely connected with the teeth and the bracket.

Five: polishing and finishing

As shown in 1, 2, 3, 4, a in Figure 11:

First remove the maxillary base mold shell and the bottom plaster work model to obtain the upper jaw overall movable denture 1, according to the grinding principle from coarse grinding to fine grinding, different types of grinding heads are used in order to remove the injection holes, exhaust holes and the edges of the base Excess resin, and then use wet and dry cloth wheel polishing to complete the maxillary movable denture restoration 2.

Further remove the mandible base mold shell and the bottom working plaster model to obtain the mandible overall movable denture 3. According to the grinding principle from coarse grinding to fine grinding, different types of grinding heads are used in order to remove the injection holes, exhaust holes and the edges of the base. Excess resin, and then use wet and dry cloth wheel polishing to complete the mandibular movable denture restoration4.

As shown in a of Figure 11, the movable denture restoration is completed.

Different from the traditional grinding and polishing, after the integral denture is obtained by the mold shell injection molding method, only a small amount of overflowing resin of the injection hole, the exhaust hole and the edge of the base bracket need to be simply polished, and then the final movable denture restoration can be completed by integral polishing The whole process is simple and fast.

In the description of the present invention, it should be noted that in the process of CAD / CAM digital production of movable dentures, working data scanning and preparation, selection and use of denture software, materials used in the production of teeth and brackets, and the manufacturing process should be broadly understood For example, the working data scan includes an external model scan and an intraoral scan; the materials used for tooth cutting are zirconia, elastic porcelain, PMMA, composite resin, etc .; the manufacturing process of the bracket includes lost wax casting, CNC cutting and 3D printing; the bracket The production materials include cobalt-chromium steel, titanium alloy, pure titanium, PEEK materials, etc .; 3D printing materials include hard printing materials, soft printing materials, etc. For those of ordinary skill in the art, the specific meaning of the foregoing in the present invention can be understood in specific situations.

Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Claims

A digital manufacturing method for CAD / CAM of stent-type movable denture, which is characterized by comprising the following steps:

1) Prepare data:

According to the dental working model, use the dental model scanner to scan the oral model to prepare the A data required for CAD design;

2) CAD design:

Use the denture design software to design the bracket structure B of the movable denture on the A data, and save the bracket structure B data in STL format;

Use denture design software to form A + data containing A data and stent structure B as a whole, and save A + data in STL format;

Use the denture design software to design the tooth structure C on the A + data, and save the tooth structure C data in STL format;

Further complete the design of the dental base;

Use denture design software to form A ++ data containing A data, stent structure B, tooth structure C and base as a whole, and save A ++ data in STL format data;

Use the denture design software to design and complete the base mold structure D on the A ++ data, and save the base mold structure D data in STL format;

3) CAM production:

Extract the three data of bracket structure B, tooth structure C, and base mold shell structure D, CAM layout, and then use casting to get the bracket structure B, CNC cutting to get the tooth structure C, 3D printing method to get the base mold shell structure D;

4) Injection molding:

First put the support structure B on the working model, then put the tooth structure C in the base mold shell structure D, and then put the working model with the support structure B and the base mold shell with the tooth structure C Structure D is matched and matched, and the edges are fixed by injection molding;

5) Polishing and polishing:

First remove the working model and the base mold shell structure D to obtain the overall movable denture, then grind away the injection resin injection hole, the exhaust hole and the excess resin on the edge of the base, and polish the final movable denture restoration.
The digital manufacturing method of the CAD / CAM of the stent-type movable denture according to claim 1, characterized in that the step 1) specifically includes: firstly use a dental three-dimensional scanner to scan the working model using a bilateral plaster model scanning mode, and then Scan the full occlusal model, mandibular plaster model, maxillary plaster model, and then automatically match the upper and lower jaw models, scan to obtain the three-dimensional data of the upper and lower jaws consistent with the working model bite, and then save the upper jaw data model in the STL format two.
The digital manufacturing method of the CAD / CAM of the stent-type movable denture according to claim 1, characterized in that the stent design in the step 2) first uses denture design software to create a single order in the stent mode, and the upper jaw stent 1 and the lower jaw are designed. Bracket two, and then save the data of maxillary bracket one and mandibular bracket two in STL format;

The A + data model in the above step 2) uses denture design software to save the maxillary data model 1 and the mandibular data model 2 containing the stent structure as a whole, forming the maxillary A + data model and the mandible A + data model, and then save them in STL format;

The tooth design in step 2) uses denture design software, uses the anatomical missing tooth model to create orders, extracts the upper and lower jaw A + data model for tooth arrangement design; according to the remaining tooth shape, the tooth selects the tooth shape in the tooth database that is similar to the remaining tooth shape Perform tooth arrangement design, then adjust the position, size and shape of the maxillary and mandibular teeth in sequence according to the tooth arrangement design process, set the distance of the teeth from the gums, set the contact distance with the adjacent teeth, complete the design of the maxillary and mandibular teeth, and then in STL format Save the upper jaw tooth data one by one, and the lower jaw tooth data two by one;

In the step 2) of the base design, based on the completion of the tooth arrangement design, use the denture design software to design the gingival pattern for base design, set the maxillary base thickness, neck base thickness, and the base edge The margin covers the maxillary nodules, the buccal edge to the mucosal turning point, and the lingual edge to the end of the stent; set the thickness of the mandible base, set the thickness of the neck base, the base of the base covers the molar back pad, and the tongue edge The bottom of the tongue is aligned with the end line of the stent, and the buccal edge to the mucosal turning point; after designing the range of the maxillary and mandibular bases, the base is bionicly adjusted according to the gum anatomy to complete the base design;

The A ++ data model in step 2) uses the denture design software to save the upper and lower jaw data models containing the bracket, teeth, and base structure to form the upper jaw A ++ data model 2 and the lower jaw A ++ data model 3, and then save them in STL format. .

The base mold design in step 2) uses denture design software to build the order with the occlusal splint module, and extract the maxillary A ++ data model and the mandible A ++ data model respectively, and then design according to the missing type of maxilla and mandible; set the maxilla The bottom gap of the base mold shell is set, the thickness of the mold shell is set, the edge line is set beyond the set edge of the base plate, the injection hole is designed at the incisor mastoid of the maxillary base mold shell, and the vent holes are provided at the upper nodules on both sides After the design is completed, the maxillary base mold shell data is saved in STL format; the bottom gap of the mandible base mold shell is set, the thickness of the mold shell is set, the edge line is set to exceed the edge of the base plate, the adjacent tooth is beyond a tooth position, and the lingual design The injection hole corresponds to the design of the vent hole on the buccal side. After the design of the base mold shell, the data of the mandible base mold shell is saved in STL format.
The digital manufacturing method for the CAD / CAM of the stent-type movable denture according to claim 1, characterized in that, the stent is made using denture typesetting software, extracting the data of the upper and lower jaws, using the stent module for layout design, and then using the denture cutting machine Cutting, cutting the wax pattern of the maxillary bracket and the wax pattern of the lower jaw bracket, using the lost wax casting process, casting, grinding and polishing to complete the maxillary cobalt chromium metal bracket and the mandible cobalt chromium metal bracket;

The tooth production uses denture typesetting software, extracts the data of upper and lower jaw teeth, and uses the full crown module for layout design, and then uses the denture cutting machine to cut the upper and lower jaw teeth, and grinds the excess connecting rods to complete the tooth production;

The production of the base mold shell uses denture typesetting software, extracts the data of the upper and lower jaw base mold shells for layout design, and uses a 3D printer and selects a soft light-curing resin to print the upper jaw base mold shell and the lower jaw base mold shell.
The digital manufacturing method for the CAD / CAM of the stent-type movable denture according to claim 1, characterized in that the step of injection molding includes: firstly positioning the maxillary cobalt-chromium metal stent on the maxillary working model, and the mandibular cobalt-chromium metal stent Place on the mandibular working model;

Position the maxillary teeth in the maxillary base mold shell and the mandible teeth in the lower jaw base mold shell;

Match the maxillary working model and the maxillary base mold shell into the structure to be injected; match the mandible working model and the mandible base mold shell into the structure to be injected; the model and the mold shell edge are fixed with an adhesive;

Use injection base resin, adjust the base resin in the vessel, and then pour into the syringe. When the resin is polymerized into the thinner, align the syringe mouth with the injection hole of the maxillary palate side and inject the resin. The vent hole of the maxillary nodule has Complete maxillary injection when the resin flows out completely;

Align the syringe with the injection hole on the lingual side of the mandible and inject resin, and complete injection of the mandible when the resin is completely discharged from the vent hole on the buccal side of the mandible;

After the injection molding, put the model into an injection pressure cooker with a temperature of 55 ° C, maintain the pressure of 2.5 MPa, polymerize and mold for 30 minutes, and take it out to cool naturally to complete the injection molding.
The digital manufacturing method of the CAD / CAM of the stent-type movable denture according to claim 1, wherein the grinding and polishing includes the steps of: first removing the maxillary base mold shell and the bottom plaster working model, to obtain the upper jaw overall movable denture, according to According to the grinding principle from rough grinding to fine grinding, different types of grinding heads are used in turn to remove excess resin from the injection holes, exhaust holes and the edges of the base, and then the wet and dry cloth wheels are used to polish the maxillary movable denture restoration;

Remove the mandibular base mold shell and the bottom working plaster model to obtain the whole mandibular movable denture. According to the grinding principle from coarse grinding to fine grinding, different types of grinding heads are used in order to remove the excess resin from the injection hole, exhaust hole and the edge of the base Then, use wet and dry cloth wheels to polish the mandibular movable denture restoration.