Manufacturing method of digital complete denture

Abstract

The invention discloses a manufacturing method of a digital complete denture. A finished artificial tooth product and a digital manufacturing mode are combined. According to the manufacturing method of the digital complete denture, provided by the invention, the tooth arrangement efficiency and quality are improved, and the labor cost is greatly saved; and meanwhile, the problems existing in matching of finished artificial teeth and digital tooth arrangement are solved, so that the complete dentures are quickly manufactured, and the use safety is ensured.

Description

Technical Field

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

[0002] Full dentures currently include traditional full dentures and digital full dentures, and the position arrangement of artificial teeth in full dentures is a very important part. Traditional full dentures are finished artificial teeth arranged by people based on experience, while digital full dentures are completed through software design and digital manufacturing. The tooth position is designed by software, and artificial teeth are made through 3D printing or CNC cutting.

[0003] However, compared with traditional finished artificial teeth, 3D printing and cutting artificial teeth have disadvantages in material performance, and there is currently no registration certificate in China, which makes them unsuitable for long-term use in the oral cavity. However, the method of directly using finished artificial teeth to bond to cut or 3D printed bases is not suitable for every case because the size of finished artificial teeth is fixed, and the use of finished artificial teeth combined with cut bases requires manual adjustment and then the traditional injection molding process to complete, which is complicated and costly. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the existing method for making digital full dentures uses 3D printing and cutting methods, the color and material of which are not as good as those of finished artificial teeth, and are not suitable for long-term use in the oral cavity, or finished artificial teeth are used but not suitable for every case, and the bonding strength problem caused by the reduction of the bonding surface of artificial teeth after modifying the finished artificial teeth. Therefore, the present invention provides a method for making digital full dentures, which improves the efficiency and quality of tooth arrangement and greatly saves labor costs; at the same time, it solves the problem of matching finished artificial teeth with digital tooth arrangement, thereby quickly completing the production of full dentures and ensuring safety in use.

[0005] To achieve the above object, the present invention provides a method for making a digital complete denture, comprising the following steps:

[0006] First determine the model of the maxillary and mandibular positions, i.e. the upper and lower jaw external shape models;

[0007] Scan a set of finished artificial teeth to obtain the 3D model of each single tooth;

[0008] The software is used to modify the root data of each single tooth in the three-dimensional model, and the corresponding tooth-shaped holes are designed at the bottom of each artificial tooth model, and then the cutting parameters are formed; among them, the cutting parameters are a cutting file with the suffix nc, which can be defined as a code, named using brand name + artificial tooth number + artificial tooth model (L or M or S).nc.

[0009] Arrange the modified 3D model as required to form position data for digital tooth arrangement operation;

[0010] According to the position data and the holes of the artificial tooth model, the protrusions of the base that match the holes of the artificial tooth model are positioned and designed to form the base protrusion cutting data;

[0011] Design a positioning plate for finished artificial teeth, including positioning space for 28 teeth;

[0012] Place the finished artificial teeth at the corresponding position in the positioning plate;

[0013] The positioning plate with the finished artificial teeth is placed in the automatic cutting device, a cutting program is designed according to the cutting parameters, and the finished artificial teeth are cut;

[0014] Put the base into the automatic cutting device, design the cutting program according to the base protrusion cutting data, and cut the base;

[0015] The cut finished artificial teeth are matched one by one with the base, and the base and the finished artificial teeth are connected to complete the production of full dentures.

[0016] Furthermore, a hole in the shape of a corresponding tooth is designed at the bottom of each artificial tooth model, and a retention shape is provided in the hole.

[0017] Furthermore, the protrusion of the base is configured to match the retention shape in the hole of the artificial tooth model.

[0018] Further, the finished artificial tooth is configured to use a resin material.

[0019] Furthermore, scanning the finished artificial tooth includes two scans, and the two scans respectively scan two opposite surfaces of the finished artificial tooth.

[0020] Furthermore, software is used to modify the root data in the acquired three-dimensional model. Specifically, the root of each artificial tooth in the three-dimensional model is shortened by processing the model using dental design software. The length of the root of each artificial tooth model includes three conditions: long, medium, and short (leaving 80%, 60%, and 40%).

[0021] Furthermore, when the length of the root is set to long, 80% of the root is retained; when it is set to medium, 60% of the root is retained; and when it is set to short, 40% of the root is retained.

[0022] Furthermore, shortening the root of each artificial tooth in the three-dimensional model also includes shortening the root according to the set length, thickness and inclination, which is related to the thickness and inclination of each artificial tooth.

[0023] Furthermore, a corresponding tooth-shaped hole is designed at the bottom of each artificial tooth model, and then cutting parameters are formed, which specifically includes the following steps:

[0024] First, obtain the contour information of each artificial tooth model in the specified direction, and then set the reduction ratio according to the contour information to form the cutting contour data of the hole. According to the cutting contour data of the hole, determine the cutting depth, and then set the parameters for removing undercuts, smoothing the shape, and removing sharp angles and edges to form the cutting parameters.

[0025] Furthermore, the finished artificial teeth and the base after cutting are matched one by one, specifically, the protrusions of the base are matched and fixed with the retention shapes in the holes of the artificial tooth roots, and the base and the artificial teeth are bonded with an adhesive.

[0026] Furthermore, the protrusions of the base and the retention shapes in the artificial tooth holes form a one-to-one correspondence.

[0027] Technical Effects

[0028] The present invention provides a method for making a digital full denture, which uses a mature finished artificial tooth system, and its material, color, and safety can be guaranteed. At the same time, it combines digital tooth arrangement and a production method, does not require artificial tooth arrangement, reduces technical difficulty, improves efficiency and quality, and solves the bonding problem existing in finished artificial teeth and digital production, ensures the bonding stability of the full denture, and is suitable for customization for each case, thereby improving customer satisfaction and comfort of use.

[0029] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a method for making a digital complete denture according to a preferred embodiment of the present invention before and after the front teeth are trimmed;

[0031] Figure 2 It is a schematic diagram of the posterior teeth before and after trimming in a method for making a digital complete denture according to a preferred embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of the combination of a modified artificial tooth and a base in a method for making a digital complete denture according to a preferred embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of the bottom hole of an artificial tooth in a method for making a digital complete denture according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] In the following description, specific details such as specific internal procedures and techniques are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0036] A preferred embodiment of the present invention provides a method for making a digital complete denture, comprising the following steps:

[0037] Step 100, first determine the model of the upper jaw, lower jaw and their positional relationship, that is, the upper and lower jaw shape model;

[0038] Step 200, scan a pair of finished artificial teeth and obtain the three-dimensional model of each single tooth respectively; at this time, the first database is obtained: the single tooth morphology database of the finished artificial teeth, which provides a basis for subsequent data processing; wherein, the finished artificial teeth use resin materials, and scanning the finished artificial teeth includes two scans, and the two scans scan two opposite sides of the finished artificial teeth respectively. After scanning twice, they are spliced ​​in the software to form a complete three-dimensional model of the finished artificial teeth (single teeth), thereby forming a single tooth morphology database of artificial teeth, and the full appearance and morphology of 28 teeth can be seen from the single tooth morphology database.

[0039] Step 300, using software to modify the data of the root in the acquired three-dimensional model, and designing a corresponding tooth-shaped hole at the bottom of each artificial tooth model, and then forming cutting parameters; wherein a retention shape is provided in the hole;

[0040] In this embodiment, dental design software is used to process the model, such as exocad, 3shape, etc. The cutting parameters in this embodiment form a second database. Specifically, the contour information of each artificial tooth model in a specified direction is first obtained, and then the reduction ratio is set according to the contour information to form the cutting contour data of the hole. According to the cutting contour data of the hole, the cutting depth is determined, and then the parameters for removing undercuts, smoothing the shape, and removing sharp angles and sharp edges are set to form the cutting parameters. In this embodiment, the model is processed using dental design software to shorten the root of each artificial tooth in the three-dimensional model. The length of the root of each artificial tooth model includes three situations: long, medium, and short. Among them, the long situation is to retain 80% of the root, the medium situation is to retain 60% of the root, and the short situation is to retain 40% of the root.

[0041] In addition, in the embodiment of the present invention, the shape contour information of each artificial tooth model in a specified direction is obtained because its cutting data is related to the thickness and inclination of each tooth. Therefore, the parameter data for cutting the root of the artificial tooth is related to the length, thickness and inclination of the artificial tooth. The 28 teeth can be divided into four types: incisors, canines, premolars and molars. Different types of teeth have different cutting inclinations and thicknesses. For the incisors, first take the side of the incisor and take the two farthest endpoints. The connecting line is the long axis of the tooth. The cutting direction of the incisor is 30° with the long axis of the tooth (the cutting direction is basically along the original direction of the root), forming two sets of cutting parameter data:

[0042] y1=0.9x+0.21

[0043] y2=0.75x+0.85

[0044] Among them, y1 is the length of the artificial tooth after modification (when the longer length is retained), y2 is the length of the artificial tooth after modification (when the shorter length is retained), and x is the length of the original artificial tooth.

[0045] For the canine, the two farthest endpoints are taken from the side of the canine. The connecting line is the long axis of the tooth. The cutting direction of the canine is 30° with the long axis of the tooth (the cutting direction is basically along the original direction of the tooth root), forming two sets of cutting parameter data:

[0046] y1=0.94x-0.1

[0047] y2=1.12x-2.9

[0048] Among them, y1 is the length of the artificial tooth after modification (when the longer length is retained), y2 is the length of the artificial tooth after modification (when the shorter length is retained), and x is the length of the original artificial tooth.

[0049] For premolars, the line connecting the two vertices of the occlusal surface of the premolars is the long axis of the tooth, and the cutting direction of the premolars is an angle of 45° with the long axis of the tooth (the cutting direction is basically along the original direction of the tooth root), forming two sets of cutting parameter data:

[0050] y1=1.18x-3

[0051] y2=1.61x-8.9

[0052] Among them, y1 is the length of the artificial tooth after modification (when the longer length is retained), y2 is the length of the artificial tooth after modification (when the shorter length is retained), and x is the length of the original artificial tooth.

[0053] For molars, the line connecting the two vertices of the occlusal surface of the molar is used as the long axis of the tooth. The cutting direction of the molar is 10° with the long axis of the tooth (the cutting direction is basically along the original direction of the tooth root), forming two sets of cutting parameter data:

[0054] y1=0.89x-0.2

[0055] y2=0.9x-1.97

[0056] Among them, y1 is the length of the artificial tooth after modification (when the longer length is retained), y2 is the length of the artificial tooth after modification (when the shorter length is retained), and x is the length of the original artificial tooth.

[0057] Different types of teeth, according to their thickness, inclination and three lengths, determine the three cutting parameter data of each tooth. Among them, the cutting parameter is a cutting file with the suffix nc, which can be defined as a code, named using brand name + artificial tooth number + artificial tooth model (L or M or S).nc.

[0058] Step 400, the three-dimensional model modified by the use data is arranged as required to form position data for digital tooth arrangement operation; the position data forms a third database, and the position data can be used to design tooth arrangement for each patient, realize digital tooth arrangement, and greatly save the time and cost of manual tooth arrangement. Since the finished artificial teeth are used in this embodiment, when each single tooth in a set of finished artificial teeth has a fixed position, the single artificial teeth modified by the use data are arranged according to the original position, and each tooth is numbered to form position data. After the position data is formed for each tooth, each tooth has its own fixed position, and only different lengths need to be adjusted or selected when arranging teeth.

[0059] Step 500, based on the position data and the hole of the artificial tooth model, locate and design the protrusion of the base that matches the retention shape in the hole to form the base protrusion cutting data; in this embodiment, the protrusion of the base corresponds to the retention shape one by one, that is, one tooth only matches one base protrusion, which further reduces errors in tooth arrangement. Among them, the size of the hole of the artificial tooth model is one-third of the cutting surface after the artificial tooth length is cut. Among them, when designing the base, it is necessary to take a mold of the base. In this embodiment, the mold taking includes two forms, 1: Use a mold taking tool (tray) and a mold taking material (silicone rubber, etc.) to put it into the patient's mouth to make an impression, and then scan the impression to obtain the upper and lower jaw shape data. 2: Directly use an intraoral scanner to scan the upper and lower jaw shape data in the mouth, and at the same time obtain the relative position relationship of the upper and lower jaw models. According to the above data, the base shape of the appropriate model is generated. The intraoral scanner has auxiliary software that adapts to the model size, shape, etc., and the appropriate base shape is generated through the auxiliary software. At the same time, the intraoral scanner can also provide reference data on the appropriate artificial tooth size and shape based on the model size and the position relationship between the upper and lower models; then cooperate with the multi-functional final impression device to make a base that matches the user.

[0060] Then in the 3D model software, match the artificial teeth and the base, and you can visually see whether the artificial teeth of different lengths will penetrate the base. If it penetrates the base, you can directly select other lengths. This can avoid re-grinding or adjustment after cutting and bonding the artificial teeth and the base.

[0061] Step 600, design a positioning plate for a finished artificial tooth, including positioning space for 28 teeth; in this embodiment, the positioning plates are numbered and correspond to the 28 teeth one by one, so that they can be cut simultaneously during cutting, improving efficiency and cutting accuracy. The positioning plate for the finished artificial tooth is a positioning tool for the artificial tooth when it is placed in the cutting device. The shape of each artificial tooth is modified by the cutting device and the position needs to be matched (for example, the cutting path of tooth No. 1 (the trajectory of the cutting knife in the cutting device, determined by the cutting program) will run in a specific position, then artificial tooth No. 1 needs to be placed in the corresponding position to be cut correctly).

[0062] Step 700, placing the finished artificial tooth at a corresponding position in the positioning plate;

[0063] In step 800, the positioning plate with the finished artificial teeth is placed into the automatic cutting device, a cutting program is designed according to the cutting parameters, and the finished artificial teeth are cut; in steps 200 and 500, each model of the finished artificial teeth needs to be cut and positioned with the positioning plate to facilitate placing the artificial teeth on the positioning plate, and then the corresponding cutting program is selected to modify the cutting of the finished artificial teeth to complete the modified artificial tooth shape.

[0064] Step 900, placing the base into an automatic cutting device, designing a cutting program according to the base protrusion cutting data, and cutting the base;

[0065] Step 1000, the finished artificial teeth and the base are matched one by one, and the base and the finished artificial teeth are bonded with an adhesive to complete the production of the full denture. The full denture prepared by the method for making a digital full denture of the present invention can be suitable for the user without trial wearing and adjustment. This is because in the production process, by establishing three databases and applying a three-dimensional model to perform digital tooth arrangement operations, it is ensured that the base is suitable for the user, and the artificial teeth matched with the base are perfectly matched with the base, so that there is no need for secondary adjustment, and the design is accurate and the production is convenient.

[0066] In another preferred embodiment of the present invention, Figure 4 As shown, the hole also includes a positioning groove 1, a retention groove 2 and an overflow groove 3, and the corresponding base also includes a positioning protrusion and a retention protrusion. The positioning groove 1 and the retention groove 2 in the hole match the positioning protrusion and the retention protrusion on the base respectively. When in use, the positioning groove and the positioning protrusion cooperate to play a positioning role when the artificial tooth is inserted into the base; the adhesive material is placed in the retention groove in the retention groove, and the retention of the artificial tooth and the base is increased through the cooperation of the retention protrusion, the adhesive material and the retention groove, and if there is excess adhesive material, the adhesive material will overflow through the overflow groove.

[0067] The present invention provides a method for making a digital full denture, which performs different treatments on different teeth for use in tooth arrangement. Figure 1-3 As shown, the anterior teeth before trimming Figure 1 Left, after trimming Figure 1 Right side, before posterior teeth trimming Figure 2 As shown on the left, after trimming Figure 2 As shown on the right. After the artificial teeth are modified, they will fit better with the base, and after trimming, it can ensure that the artificial teeth will not penetrate the base when the teeth are arranged, thus avoiding secondary grinding and saving time and effort. The schematic diagram of the trimmed artificial teeth combined with the base after the teeth are arranged is shown as follows Figure 3 shown.

[0068] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A method for making a digital complete denture, characterized in that: The following steps are involved: First determine the model of the maxilla, mandible and their positional relationship; Scan a set of finished artificial teeth to obtain the 3D model of each single tooth; The software is used to modify the root data in the three-dimensional model of each single tooth, and a corresponding tooth-shaped hole is designed at the bottom of each artificial tooth model, and then the cutting parameters are formed; Arrange the modified 3D model as required to form position data for digital tooth arrangement operation; According to the position data and the holes of the artificial tooth model, the protrusions of the base that match the holes of the artificial tooth model are positioned and designed to form the base protrusion cutting data; Design a positioning plate for finished artificial teeth, including positioning space for 28 teeth; Placing the finished artificial teeth at corresponding positions in the positioning plate; The positioning plate with the finished artificial teeth is placed in the automatic cutting device, a cutting program is designed according to the cutting parameters, and the finished artificial teeth are cut; Put the base into the automatic cutting device, design the cutting program according to the base protrusion cutting data, and cut the base; The cut finished artificial teeth are matched one by one with the base, and the base and the finished artificial teeth are connected to complete the production of full dentures.

2. A method for making a digital complete denture according to claim 1, characterized in that: The bottom of each artificial tooth model is designed with a hole in the shape of a corresponding tooth, and a retention shape is arranged in the hole.

3. A method for making a digital complete denture according to claim 2, characterized in that: The protrusion of the base is configured to match the retention shape in the hole of the artificial tooth model.

4. The method for making a digital complete denture according to claim 1, characterized in that: The finished artificial tooth is configured to use a resin material.

5. The method for making a digital complete denture according to claim 1, characterized in that: Scanning the finished artificial tooth includes two scans, and the two scans respectively scan two opposite sides of the finished artificial tooth.

6. The method for making a digital complete denture according to claim 1, characterized in that: The software is used to modify the data of the roots in the acquired three-dimensional model. Specifically, the root of each artificial tooth in the three-dimensional model is shortened by processing the model with dental design software. The length of the root of each artificial tooth model includes three conditions: long, medium and short (leaving 80%, 60% and 40%).

7. A method for making a digital complete denture according to claim 6, characterized in that: When the length of the root is set to long, 80% of the root is retained; when it is set to medium, 60% of the root is retained; when it is set to short, 40% of the root is retained.

8. The method for making a digital complete denture according to claim 6, characterized in that: The root of each artificial tooth in the three-dimensional model is shortened, and the root is shortened according to the set length, thickness and inclination in relation to the thickness and inclination of each artificial tooth.

9. The method for making a digital complete denture according to claim 5, characterized in that: A corresponding tooth-shaped hole is designed at the bottom of each artificial tooth model, and then cutting parameters are formed, which specifically includes the following steps: First, obtain the contour information of each artificial tooth model in the specified direction, and then set the reduction ratio according to the contour information to form the cutting contour data of the hole. According to the cutting contour data of the hole, determine the cutting depth, and then set the parameters for removing undercuts, smoothing the shape, and removing sharp angles and edges to form the cutting parameters.

10. The method for making a digital complete denture according to claim 1, characterized in that: The finished artificial teeth and the base after cutting are matched one by one, specifically, the protrusions of the base are matched and fixed with the retention shapes in the holes of the artificial tooth roots, and the base and the artificial teeth are bonded with an adhesive.

11. A method for making a digital complete denture according to claim 10, characterized in that: The protrusions of the base and the retention shapes in the artificial tooth holes form a one-to-one correspondence.

Images