3D printing method and system for a dental instrument

Abstract

The present invention discloses a 3D printing method for dental instruments, which includes obtaining a dental fluorescence reaction image around the tooth to be 3D printed. First, positioning at a specific position is performed. The positioning at the specific position is to receive a preset window position and size around the target tooth to be obtained. The tooth at the preset position in the oral cavity is irradiated by an ultraviolet light source to cause the tooth to have a fluorescence reaction. The dental fluorescence image of a specific area is collected by an image acquisition device, and the image is processed. The area to be processed of the dental fluorescence image is selected according to the position and size of the window, and the average grade corresponding to the fluorescence reaction of all natural teeth in the area to be processed is extracted, that is, the fluorescence reaction data of each natural tooth in the area to be processed is obtained, and the fluorescence reaction data is quantified into corresponding grade data. A coloring dye corresponding to the fluorescence reaction grade is selected to color the 3D printed tooth.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D dental printing, and particularly to a 3D printing method and system for dental instruments. Background Art

[0002] 3D printing (AM) is a new manufacturing technology different from traditional manufacturing, which combines scientific knowledge in multiple fields such as computers, material processing, and machining. Among them, stereolithography 3D printing technology is an additive manufacturing process that selectively cures photopolymer materials through photoactivated polymerization reactions. In this technology, the model is built layer by layer, either by scanning polymerization points (stereolithography - SLA) or by projecting the entire layer at once (digital light processing - DLP). Stereolithography technology can be used to prepare models with high definition and smooth surfaces, and can have high precision without mechanical post - processing of the surface, thus showing great potential in the field of additive manufacturing.

[0003] The technology of realizing the physical structure of an object by layer - by - layer printing is also called additive manufacturing, which covers a variety of different types of technologies. In recent years, dental restorations based on software design have been rapidly popularized. Many dental clinics and professional denture production enterprises have introduced 3D printing equipment, and combined with 3D - printed digital dentistry technology, directly convert 3D design models into real products, bringing high - precision and low - cost oral data and products to the dental industry. Compared with the traditional manufacturing mode, oral 3D printing is more suitable for making small - batch customized and complex - shaped products. Currently, 3D printing has been applied to fields such as denture printing, orthodontic appliance production, preoperative rehearsal model production, and surgical guide production in oral medicine, which will greatly improve the precision and efficiency of oral medicine.

[0004] The prior art CN111730863A discloses a polishing method for 3D printed teeth. The specific implementation method is as follows: S1. Input three-dimensional tooth model data and use a 3D printing device to print teeth; S2. Evaluate the roughness of the printed teeth; S3. Use relevant equipment to roughly polish and level the surface of the printed teeth to weaken the cross-striped structure; S4. Gradually polish the printed teeth after rough polishing and leveling; S5. Surface clean the printed teeth after gradual polishing; S6. Perform surface curing treatment on the cleaned printed teeth; S7. Clean and polish the printed teeth after the curing treatment is completed. That is, the beauty of the teeth is achieved by surface cleaning the printed teeth. However, the existing beauty method can only beautify in the general visible light range. Natural teeth emit blue fluorescence under ultraviolet light irradiation. Since not only sunlight contains ultraviolet light components, but also some artificial light sources such as some fluorescent lamps, camera flashes, and lights in entertainment venues emit ultraviolet light components, this will cause restorations, especially 3D printed teeth, that are in these specific environments with ultraviolet light and have no or weak or strong fluorescence effects to form an obvious difference from natural teeth and cannot be coordinated with natural teeth.

[0005] There is no content in the prior art about fluorescent coloring of 3D printed dental appliances. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention discloses a 3D printing method for dental instruments, and the printing method includes the following steps:

[0007] Step 1, obtain a tooth fluorescence reaction image around the tooth to be 3D printed. First, perform positioning of a specific position. The positioning of the specific position is to receive a preset window position and size around the target tooth to be obtained. Irradiate the teeth at a preset position in the oral cavity with an ultraviolet light source to make the teeth produce a fluorescence reaction;

[0008] Step 2, collect a tooth fluorescence image of a specific area through an image acquisition device and process the image. Select the area to be processed of the tooth fluorescence image according to the position and size of the window, extract the average grade corresponding to the fluorescence reactions of all natural teeth in the area to be processed, that is, obtain the fluorescence reaction data of each natural tooth in the area to be processed, and quantify the fluorescence reaction data into corresponding grade data;

[0009] Step 3, select a coloring dye corresponding to the fluorescence reaction grade to color the 3D printed teeth.

[0010] Further, the quantification of the fluorescence reaction data into corresponding grade data further includes: obtaining the fluorescence intensity of natural teeth, then classifying the fluorescence intensity, and classifying the fluorescence reactions within a certain range into the same grade data.

[0011] Further, each grade of fluorescence reaction corresponds to a ratio of fluorescent dye.

[0012] Further, it further includes step 4. Irradiate the teeth at a preset position in the oral cavity with a visible light source to obtain a general reflection image of the teeth, and obtain the average color value of the natural teeth around the specific position; input the three-dimensional model data of the teeth to be 3D printed, and use a 3D printing device to print the teeth. After polishing and cleaning the printed target teeth, perform a coloring process. First, perform corresponding tooth color adjustment according to the average color value, select a coloring dye with the same color as the average color value for tooth coloring, and perform the first curing after coloring. Then, select a fluorescent staining agent associated with the average grade corresponding to the fluorescence reaction to perform a second coloring on the 3D printed teeth to ensure the same fluorescence reflection as the natural teeth under specific ultraviolet light. After passing the fluorescence inspection, perform a second curing on the 3D printed teeth.

[0013] Further, the fluorescence inspection is to irradiate the 3D printed teeth after fluorescence staining with the same ultraviolet light source, and then compare the fluorescence similarity between the natural teeth and the 3D printed teeth. After the similarity reaches a preset value, it is determined that the fluorescence coloring for this time meets the requirements and permission for the second curing is granted; otherwise, it is determined that the coloring is unqualified, and the fluorescence coloring for this time needs to be removed and recolored.

[0014] The present invention also discloses a 3D printing system for dental instruments, and the printing system includes the following units:

[0015] A fluorescence image generation unit, which obtains a tooth fluorescence reaction image around the teeth to be 3D printed. First, perform positioning of a specific position. The positioning of the specific position is to receive a preset window position and size for obtaining around the target teeth, and irradiate the teeth at a preset position in the oral cavity with an ultraviolet light source to make the teeth produce a fluorescence reaction;

[0016] A fluorescence image acquisition unit, which collects a tooth fluorescence image of a specific area through an image acquisition device, and processes the image. Select the area to be processed of the tooth fluorescence image according to the position and size of the window, extract the average grade corresponding to the fluorescence reaction of all natural teeth within the area to be processed, that is, obtain the fluorescence reaction data of each natural tooth within the area to be processed, and quantify the fluorescence reaction data into corresponding grade data;

[0017] The fluorescence coloring unit selects a coloring dye corresponding to the fluorescence reaction level to color the 3D printed tooth.

[0018] Furthermore, the quantification of the fluorescence reaction data into corresponding level data further includes: obtaining the fluorescence intensity of natural teeth, then classifying the fluorescence intensity, and classifying the fluorescence reactions within a certain range into the same level data.

[0019] Furthermore, each level of fluorescence reaction corresponds to a specific ratio of fluorescent dye.

[0020] Furthermore, it further includes a fluorescence high-order coloring unit. By irradiating the teeth at a preset position in the oral cavity with a visible light source, a general reflection image of the teeth is obtained, and the average color value of the natural teeth around the specific position is acquired; the three-dimensional model data of the teeth to be 3D printed is input, and the teeth are printed using a 3D printing device. After the printed target teeth are polished and cleaned, they are subjected to a coloring process. First, corresponding tooth color adjustment is performed according to the average color value, and a coloring dye with the same color as the average color value is selected for tooth coloring. After the coloring is completed, the first curing is carried out. Then, a fluorescent staining agent associated with the average level corresponding to the fluorescence reaction is selected to perform a second coloring on the 3D printed teeth to ensure the same fluorescence reflection as the natural teeth under specific ultraviolet light. After passing the fluorescence inspection, the 3D printed teeth are subjected to a second curing.

[0021] The fluorescence inspection is to irradiate the 3D printed teeth after fluorescence staining with the same ultraviolet light source, and then compare the fluorescence similarity between the natural teeth and the 3D printed teeth. After the similarity reaches the preset value, it is determined that the fluorescence coloring meets the requirements and the second curing is permitted; otherwise, it is determined that the coloring is unqualified, and the fluorescence coloring for this time needs to be removed and re-colored.

[0022] Aiming at the prior art, the beneficial effects of the present invention are very significant. The beneficial effects of the present invention are as follows: for 3D printed teeth, it solves the problem that in these specific environments with ultraviolet light, restorations without or with weak or strong fluorescence effects, especially 3D printed teeth, can form an obvious difference from natural teeth. At the same time, by using the method of classifying and grading the fluorescence of natural teeth, the selection of fluorescent agents is carried out to reduce the difference between the printed teeth and natural teeth. At the same time, for better curing effects, the present invention performs multiple curings in the coating part, ensuring durability on the premise that the color itself does not conflict with the fluorescence effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention can be further understood from the following description in conjunction with the drawings. The components in the drawings are not necessarily drawn to scale, but the emphasis is placed on showing the principles of the embodiments. In the drawings, the same reference numerals designate corresponding parts in different views.

[0024] Figure 1 It is the flowchart of the 3D printing method of a dental instrument of the present invention.

[0025] Figure 2 It is the flowchart of the 3D printing method of a dental instrument in an embodiment of the present invention. Detailed implementation manners

[0026] Embodiment 1

[0027] As Figure 1 shown, this embodiment provides a 3D printing method for dental instruments. The printing method includes the following steps:

[0028] Step 1: Obtain the dental fluorescence reaction image around the tooth to be 3D printed. First, perform positioning at a specific position. The positioning at the specific position is to receive the preset window position and size for obtaining around the target tooth. Irradiate the teeth at the preset position in the oral cavity with an ultraviolet light source to cause the teeth to have a fluorescence reaction;

[0029] Step 2: Collect the dental fluorescence images of a specific area through an image acquisition device, and process the images. Select the area to be processed of the dental fluorescence image according to the position and size of the window, extract the average grade corresponding to the fluorescence reactions of all natural teeth in the area to be processed, that is, obtain the fluorescence reaction data of each natural tooth in the area to be processed, and quantify the fluorescence reaction data into corresponding grade data;

[0030] Step 3: Select a coloring dye corresponding to the fluorescence reaction grade to color the 3D printed tooth.

[0031] Furthermore, the quantification of the fluorescence reaction data into corresponding grade data further includes: obtaining the fluorescence intensity of natural teeth, then performing grade division on the fluorescence intensity, and classifying the fluorescence reactions within a certain range into the same grade data.

[0032] Furthermore, each grade of fluorescence reaction corresponds to a proportioned fluorescent dye.

[0033] Embodiment 2

[0034] As Figure 2 shown, this embodiment provides a 3D printing method for dental instruments. The printing method includes the following steps:

[0035] Step 1: Obtain the dental fluorescence reaction image around the tooth to be 3D printed. First, perform positioning at a specific position. The positioning at the specific position is to receive the preset window position and size for obtaining around the target tooth. Irradiate the teeth at the preset position in the oral cavity with an ultraviolet light source to cause the teeth to have a fluorescence reaction;

[0036] Step 2: Collect the fluorescence image of teeth in a specific area through an image acquisition device, and process the image. Select the area to be processed of the teeth fluorescence image according to the position and size of the window, and extract the average grade corresponding to the fluorescence reaction of all natural teeth in the area to be processed, that is, obtain the fluorescence reaction data of each natural tooth in the area to be processed, and quantify the fluorescence reaction data into corresponding grade data;

[0037] Step 3: Irradiate the teeth at a preset position in the oral cavity with a visible light source to obtain a general reflection image of the teeth, and obtain the average color value of the natural teeth around the specific position;

[0038] Step 4: Input the three-dimensional model data of the teeth to be 3D printed, and use a 3D printing device to print the teeth. After polishing and cleaning the printed target teeth, perform a coloring process. First, perform corresponding tooth color adjustment according to the average color value, select a coloring dye with the same color as the average color value for tooth coloring, and perform the first curing after the coloring is completed. Then, select a fluorescent stain associated with the average grade corresponding to the fluorescence reaction to perform a second coloring on the 3D printed teeth to ensure the same fluorescence reflection as the natural teeth under specific ultraviolet light. After passing the fluorescence inspection, perform a second curing on the 3D printed teeth.

[0039] Furthermore, the fluorescence inspection is to irradiate the 3D printed teeth after fluorescence staining with the same ultraviolet light source, and then compare the fluorescence similarity between the natural teeth and the 3D printed teeth. After the similarity reaches a preset value, it is determined that the fluorescence coloring of this time meets the requirements, and the second curing is allowed. Otherwise, it is determined that the coloring is unqualified, and the fluorescence coloring of this time needs to be removed and re-colored.

[0040] Embodiment III

[0041] From the perspective of hardware, the inventive concept of the present invention is described, and a 3D printing system for dental instruments is provided. The printing system includes the following units:

[0042] A fluorescence image generation unit, which acquires the teeth fluorescence reaction image around the teeth to be 3D printed. First, perform positioning of a specific position. The positioning of the specific position is to receive the preset window position and size for acquiring around the target teeth, and irradiate the teeth at a preset position in the oral cavity with an ultraviolet light source to make the teeth produce a fluorescence reaction;

[0043] The fluorescence image acquisition unit collects the fluorescence images of teeth in a specific area through an image acquisition device, processes the images, selects the area to be processed of the teeth fluorescence image according to the position and size of the window, extracts the average grade corresponding to the fluorescence reactions of all natural teeth in the area to be processed, that is, obtains the fluorescence reaction data of each natural tooth in the area to be processed, and quantifies the fluorescence reaction data into corresponding grade data;

[0044] The fluorescence coloring unit selects a coloring dye corresponding to the fluorescence reaction grade to color the 3D printed teeth.

[0045] Furthermore, the quantification of the fluorescence reaction data into corresponding grade data further includes: obtaining the fluorescence intensity of the natural teeth, then classifying the fluorescence intensity, and classifying the fluorescence reactions within a certain range into the same grade data.

[0046] Furthermore, each grade of fluorescence reaction corresponds to a proportion of fluorescent dye.

[0047] Furthermore, it further includes a fluorescence high-order coloring unit. By irradiating the teeth at a preset position in the oral cavity with a visible light source, a general reflection image of the teeth is obtained, and the average color value of the natural teeth around the specific position is obtained; the three-dimensional model data of the teeth to be 3D printed is input, and the teeth are printed using a 3D printing device. After the printed target teeth are polished and cleaned, they are subjected to a coloring process. First, corresponding tooth color adjustment is performed according to the average color value, and a coloring dye with the same average color value is selected for tooth coloring. After the coloring is completed, the first curing is performed. Then, a fluorescent staining agent associated with the average grade corresponding to the fluorescence reaction is selected to perform the second coloring on the 3D printed teeth to ensure the same fluorescence reflection as the natural teeth under specific ultraviolet light. After passing the fluorescence inspection, the 3D printed teeth are subjected to the second curing.

[0048] The fluorescence inspection is to irradiate the 3D printed teeth after fluorescence staining with the same ultraviolet light source, and then compare the fluorescence similarity between the natural teeth and the 3D printed teeth. After the similarity reaches a preset value, it is determined that the fluorescence coloring of this time meets the requirements and the second curing is permitted; otherwise, it is determined that the coloring is unqualified and the fluorescence coloring of this time needs to be removed and re-colored.

[0049] It should also be noted that the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, commodity or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, commodity or device comprising said element.

[0050] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems or computer program products. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer-usable program code.

[0051] Although the present invention has been described above with reference to various embodiments, it should be understood that many changes and modifications can be made without departing from the scope of the present invention. Therefore, it is intended that the above detailed description be regarded as illustrative rather than restrictive, and it should be understood that the following claims (including all equivalents) are intended to define the spirit and scope of the present invention. These embodiments should be understood as being only for the purpose of illustrating the present invention and not for limiting the scope of protection of the present invention. After reading the content described in the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent changes and modifications also fall within the scope defined by the claims of the present invention.

Claims

1. A 3D printing method for a dental instrument, characterized in that, The printing method includes the following steps: Step 1: Obtain the tooth fluorescence reaction image around the tooth to be 3D printed. First, perform positioning at a specific position. The positioning at the specific position is to receive the preset window position and size for obtaining around the target tooth. Irradiate the teeth at the preset position in the oral cavity with an ultraviolet light source to make the teeth produce a fluorescence reaction. Step 2: Collect the tooth fluorescence image of a specific area through an image acquisition device and process the image. Select the area to be processed of the tooth fluorescence image according to the position and size of the window, extract the average grade corresponding to the fluorescence reaction of all natural teeth within the area to be processed, that is, obtain the fluorescence reaction data of each natural tooth within the area to be processed, and quantify the fluorescence reaction data into corresponding grade data. Step 3: Select a coloring dye corresponding to the fluorescence reaction grade to color the 3D printed tooth. Step 4: Irradiate the teeth at the preset position in the oral cavity with a visible light source to obtain a general reflection image of the teeth, and obtain the average color value of the natural teeth around the specific position. Input the three-dimensional model data of the tooth to be 3D printed, and use a 3D printing device to print the tooth. After polishing and cleaning the printed target tooth, perform a coloring process. First, perform corresponding tooth color adjustment according to the average color value, select a coloring dye with the same average color value for tooth coloring, perform the first curing after coloring, and then select a fluorescent staining agent associated with the average grade corresponding to the fluorescence reaction to perform a second coloring on the 3D printed tooth to ensure the same fluorescence reflection as the natural tooth under specific ultraviolet light. After passing the fluorescence inspection, perform a second curing on the 3D printed tooth. Among them, the fluorescence inspection is to irradiate the 3D printed tooth after fluorescence staining with the same ultraviolet light source, and then compare the fluorescence similarity between the natural tooth and the 3D printed tooth. After the similarity reaches the preset value, it is determined that the fluorescence coloring meets the requirements and permission for the second curing is granted; otherwise, it is determined that the coloring is unqualified, and the fluorescence coloring for this time needs to be removed and re-colored.

2. The 3D printing method of a dental instrument according to claim 1, characterized in that The quantification of the fluorescence reaction data into corresponding grade data further includes: obtaining the fluorescence intensity of the natural tooth, and then performing grade division on the fluorescence intensity. The fluorescence reactions within a certain range are classified into the same grade data.

3. The 3D printing method of a dental instrument according to claim 2, wherein, Each grade of fluorescence reaction corresponds to a specific ratio of fluorescent dye.

4. A 3D printing system for dental instruments, characterized in that, The printing system includes the following units: A fluorescence image generation unit, which obtains the tooth fluorescence reaction image around the tooth to be 3D printed. First, perform positioning at a specific position. The positioning at the specific position is to receive the preset window position and size for obtaining around the target tooth. Irradiate the teeth at the preset position in the oral cavity with an ultraviolet light source to make the teeth produce a fluorescence reaction. A fluorescence image acquisition unit acquires a fluorescence image of teeth in a specific area through an image acquisition device, processes the image, selects a processing area of the teeth fluorescence image according to the position and size of the window, extracts the average grade corresponding to the fluorescence reaction of all natural teeth in the processing area, that is, obtains the fluorescence reaction data of each natural tooth in the processing area, and quantifies the fluorescence reaction data into corresponding grade data; A fluorescence coloring unit selects a coloring dye corresponding to the fluorescence reaction grade to color the 3D printed teeth; A high-order fluorescence coloring unit irradiates the teeth at a preset position in the oral cavity with a visible light source to obtain a general reflection image of the teeth, and obtains the average color value of the natural teeth around the specific position; inputs the three-dimensional model data of the teeth to be 3D printed, and uses a 3D printing device to print the teeth, and after polishing and cleaning the printed target teeth, performs a coloring process. First, performs corresponding tooth color adjustment according to the average color value, selects a coloring dye with the same average color value for tooth coloring, performs the first curing after coloring, and then selects a fluorescent stain associated with the average grade corresponding to the fluorescence reaction to perform the second coloring on the 3D printed teeth to ensure the same fluorescence reflection as the natural teeth under specific ultraviolet light. After passing the fluorescence inspection, performs the second curing on the 3D printed teeth; The fluorescence inspection is to irradiate the 3D printed teeth after fluorescence staining with the same ultraviolet light source, and then compare the fluorescence similarity between the natural teeth and the 3D printed teeth. After the similarity reaches a preset value, it is determined that the fluorescence coloring of this time meets the requirements and the second curing is permitted; otherwise, it is determined that the coloring is unqualified and the fluorescence coloring of this time needs to be removed and recolored.

5. The 3D printing system for a dental instrument according to claim 4, characterized in that, The quantification of the fluorescence reaction data into corresponding grade data further includes: obtaining the fluorescence intensity of the natural teeth, and then performing grade division on the fluorescence intensity, and classifying the fluorescence reactions within a certain range into the same grade data.

6. The 3D printing system for a dental instrument according to claim 5, characterized in that, Each grade of fluorescence reaction corresponds to a ratio of fluorescent dye.

Images