A cutting method and system for convenient removal of dental crowns

Abstract

The present application provides a cutting method and system for facilitating the removal of a crown, the method comprising the steps of: obtaining a digital processing model of the crown, wherein the digital processing model of the crown has a support rod model; determining a processing contour surface according to the outer surface of the support rod model in the depth direction, wherein the processing contour surface is used to limit the processing boundary range and the processing depth, and the processing contour surface is separated from the outer surface of the support rod model by a first distance, and the first distance is determined according to the reserved thickness of the support rod to be retained; generating a processing path according to the processing contour surface, wherein the processing path is used to control the tool to process the support rod. The problem that manual processing of the support rod in the prior art easily leads to damage to the crown and unsafe production process is solved.

Description

Technical Field

[0001] The present application relates to the field of oral digital medical technology, and more specifically, to a cutting method and system for facilitating the removal of a dental crown. Background Art

[0002] In life, some patients face oral problems and thus have a need for dentures. With the improvement of living standards, people have higher and higher requirements for the quality of dentures. Existing denture crowns usually use zirconia crowns or titanium alloy crowns. Fig.10 As shown in Figure (c), the existing crown is usually cut and formed on a zirconium oxide plate or a titanium plate (plate body) during the production process. A support rod is connected between the formed crown and the plate body, such as Fig.10 As shown in the middle (d) figure, the support rod needs to be manually ground using a trolley, and the support rod (cylindrical 2.0mm or larger diameter) is cut and ground using the trolley.

[0003] like Fig.10 As shown in the middle (d) figure, in the process of grinding the support rod by hand using a manual trolley, the trolley tool is used for grinding, which is easy to hit the crown and cause chipping and cracking. In addition, dust and block particles are generated in the process of manual grinding and cutting of the support rod, which are easy to shoot into the eyes and cause personal injury.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] The purpose of the present application is to provide a cutting method and system for facilitating the removal of a dental crown, thereby solving the problem in the prior art that manual removal of a support rod may easily lead to damage to the dental crown and an unsafe production process.

[0006] To achieve the above purpose, the technical solution adopted in this application is:

[0007] In one aspect, the present application provides a cutting method for facilitating the removal of a dental crown, the method comprising the steps of:

[0008] Acquire a digital processing model of a dental crown, wherein the digital processing model of the dental crown has a support rod model;

[0009] Determine a machining contour surface according to the outer surface of the support rod model in the depth direction, wherein the machining contour surface is used to limit the machining boundary range and the machining depth, and the machining contour surface is spaced a first distance from the outer surface of the support rod model, and the first distance is determined according to a reserved thickness of the support rod that needs to be retained;

[0010] A machining path is generated according to the machining contour surface, wherein the machining path is used to control the tool to machine the support rod.

[0011] Optionally, the step of determining the machining contour surface according to the outer surface of the support rod model in the depth direction includes:

[0012] Determine a reference datum curved surface according to the outer surface of the support rod model in the depth direction, wherein the reference datum curved surface matches the outer contour of the outer surface of the support rod model in the depth direction;

[0013] According to the reserved thickness of the support rod, the reference datum plane is offset by a first distance in the depth direction to generate a machining contour surface.

[0014] Optionally, in the step of determining the machining contour surface according to the outer surface of the support rod model in the depth direction:

[0015] Determine a first reference datum surface according to the bottom surface of the back-knife side of the support rod model;

[0016] The first reference datum plane is offset by a first distance in the depth direction to generate a first processing contour surface, wherein the first distance is a reserved thickness of the support rod.

[0017] Optionally, in the step of determining the machining contour surface according to the outer surface of the support rod model in the depth direction:

[0018] Determine a first reference datum surface according to the bottom surface of the back-knife side of the support rod model;

[0019] The first reference datum plane is offset upward along the depth direction by the bottom processing distance to generate a first processing contour surface;

[0020] Determine a second reference datum surface according to the top surface of the support rod model on the knife-facing side;

[0021] The second reference datum plane is offset downward in the depth direction by the top processing distance to generate a second processing contour surface;

[0022] The first distance includes the bottom processing distance and the top processing distance, and the reserved thickness of the support rod = the thickness of the support rod model - the top processing distance - the bottom processing distance.

[0023] Optionally, in the step of generating a machining path according to the machining contour surface:

[0024] The cutting angle of the tool in the machining path is inclined.

[0025] Optionally, the cutting angle is determined according to the inclination of the surface of the digitally processed model of the crown at the support rod model, and the cutting angle is 3°-5°.

[0026] Optionally, according to the machining contour surface, the step of generating a machining path further includes:

[0027] According to the material of the digital processing model of the crown, the step-down distance of the tool in the processing path is determined.

[0028] Optionally, in the step of determining the step-down distance of the tool in the machining path according to the material of the digital machining model of the dental crown:

[0029] The materials of the crown digital processing model include: zirconia crown and metal crown, among which the cutting step of zirconia crown is 0.1-0.2mm;

[0030] The step down distance of the metal crown is 0.08mm.

[0031] Optionally, according to the machining contour surface, the step of generating a machining path further includes:

[0032] According to the material of the digital processing model of the crown, the feed speed of the tool in the processing path is determined, among which the feed speed of zirconia crown is 600-1000mm / r, and the feed speed of metal crown is 1000-1500mm / r.

[0033] On the other hand, the present application also proposes a cutting system for facilitating the removal of a dental crown, which includes: a cutting machine, a processor, a memory, and a communication bus;

[0034] The memory stores a computer-readable program executable by the processor;

[0035] The communication bus realizes the connection and communication between the processor and the memory;

[0036] The processor controls the cutting machine to execute the computer-readable program to implement the steps of the cutting method for facilitating the removal of the dental crown as described above.

[0037] The beneficial effects of a cutting method and system for facilitating the removal of a crown provided by the present application are at least as follows: a machining contour surface is determined based on the outer surface of the support rod model in the depth direction on the digital processing model of the crown, so that the machining contour surface matches the outer surface of the support rod model, thereby determining the machining boundary range and the machining depth through the machining contour surface; since the machining contour surface is separated from the outer surface of the support rod model by a first distance, the first distance is determined according to the reserved thickness of the support rod that needs to be retained, so that there is a uniform reserved thickness of the support rod between the processed contour surface and the outer surface, ensuring that the force on the support rod is relatively stable in each area during the cutting process, avoiding the problem of local fracture causing the crown to fall with a large amount of support rod residue when it is not processed in place. Finally, a machining path is generated based on the machining contour surface, wherein the machining path is used to control the tool to process the support rod. In this way, an automatic cutting processing path is formed. When the crown is cut normally, the support rod can be cut to leave a very small amount of support rod (reserved thickness of the support rod), so that the operator can break the processed crown off the plate, thereby replacing the manual handcart to grind the support rod flat, avoiding the problem of manual processing of the support rod that easily leads to damage to the crown, improving the quality of the processed crown, and making the quality of crown processing uniform. In addition, the production process is basically completed by digital programming and processing. The dust and block particles in the process of processing by CNC machine tools are blocked by the machine tools, and basically will not be shot into the eyes to cause injuries to people, making the processing process safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A flowchart of the main steps of a cutting method for facilitating the removal of a dental crown provided in an embodiment of the present application;

[0040] Figure 2 A flowchart of detailed steps of a first method of step S200 of a cutting method for facilitating removal of a dental crown provided in an embodiment of the present application;

[0041] Figure 3 A schematic diagram of the principle of a first mode of step S200 of a cutting method for facilitating removal of a dental crown provided in an embodiment of the present application;

[0042] Figure 4 A flowchart of detailed steps of a second method of step S200 of a cutting method for facilitating removal of a dental crown provided in an embodiment of the present application;

[0043] Figure 5 A schematic diagram of the principle of a second method of step S200 of a cutting method for facilitating removal of a dental crown provided in an embodiment of the present application;

[0044] Figure 6 A flowchart of the detailed steps of step S300 of a cutting method for facilitating the removal of a dental crown provided in an embodiment of the present application;

[0045] Figure 7 A schematic diagram of the principle of the inclination a in step S300 of a cutting method for facilitating removal of a dental crown provided in an embodiment of the present application;

[0046] Figure 8 The effect diagram of the support rod after cutting by a cutting method for facilitating the removal of a crown provided in an embodiment of the present application, wherein Figure 8 The middle (a) figure shows the state after cutting. Figure 8 The middle (b) picture shows the state after breaking.

[0047] Fig. 9 A structural principle block diagram of a cutting system for facilitating the removal of a dental crown provided in an embodiment of the present application;

[0048] Fig.10 This is a rendering of the support rod behind the manual handcart in the prior art, wherein Fig.10 Figure (c) shows the state of the support rod. Fig.10 The middle (d) figure shows the status of the trolley.

[0049] Among them, the reference numerals in the figure are:

[0050] 10. Digital processing model of dental crown; 11. Support rod model; 20. Tool; 30. Processing contour surface; 31. First processing contour surface; 32. Second processing contour surface; 40. Reference datum surface; 41. First reference datum surface; 42. Second reference datum surface; 60. Processor; 61. Display screen; 62. Memory; 63. Bus; 64. Communication interface; 65. Cutting machine tool. DETAILED DESCRIPTION

[0051] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application 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 application and are not used to limit the present application.

[0052] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0053] Embodiment 1

[0054] like Figure 1 As shown, this embodiment proposes a cutting method that is convenient for disassembling a dental crown, which is mainly used for processing a support rod through a CNC machine tool in a CNC programming manner. The support rod is used to connect the processed dental crown and the tray body, so that the support rod retains a very small reserved thickness of the support rod, so that after the processing is completed, it is convenient for the operator to break the processed dental crown off the tray body, or during the cutting process, the support rod with a very small thickness is broken due to the squeezing of the cutting tool, and the dental crown can fall directly.

[0055] like Figure 1 As shown, the cutting method for facilitating removal of a dental crown in this embodiment mainly comprises the following steps:

[0056] Step S100: obtaining a digital processing model of a dental crown, wherein the digital processing model of the dental crown has a support rod model.

[0057] like Figure 3 As shown, in the specific process, the crown digital processing model 10 is imported into the processing software, and the support rod model 11 is added to the crown digital processing model 10, so as to form a processing model. The processing model is a conventional processing model, and a crown processing program is generated according to the processing model, and imported into a CNC machine tool to process the tray body, so that the crown and the support rod are processed on the tray body. This process is a conventional processing process. In this embodiment, in order to realize the cutting processing of the support rod, it is necessary to design the processing path based on the support rod model 11 on the crown digital processing model 10.

[0058] Step S200, determine a machining contour surface based on the outer surface of the support rod model in the depth direction, wherein the machining contour surface is used to limit the machining boundary range and the machining depth, and the machining contour surface is separated from the outer surface of the support rod model by a first distance, and the first distance is determined according to the reserved thickness of the support rod that needs to be retained.

[0059] like Figure 3 As shown, in the specific process, for the convenience of description, the cutting depth direction of the machining tool 20 is taken as the machining depth direction, such as the Z-axis direction of the machine tool, which is usually the up-down direction. In this embodiment, the structure is described with the up-down direction as the depth direction, and the tool 20 cuts in a step-by-step manner from top to bottom. First, according to the outer surface of the support rod model 11 in the depth direction, the reference reference surface 40 is determined, wherein the reference reference surface 40 matches the outer contour of the outer surface of the support rod model 11 in the depth direction. Then, according to the reserved thickness of the support rod, the reference reference surface is offset by a first distance in the depth direction to generate a machining contour surface 30. In this way, the reference reference surface 40 is generated by first referring to the outer surface in the depth direction, and the contour of the reference reference surface 40 is basically the same as the contour of the outer surface in the depth direction (which can be the lower surface, or the lower surface and the upper surface), and the range of the reference reference surface 40 can be: the maximum diameter of the support rod model 11 + the tool diameter. Then the reference datum curved surface 40 is moved equidistantly, and the machining contour surface 30 is obtained after the first distance is offset in the depth direction. Then the machining contour surface 30 has the same contour as the reference datum curved surface 40, but the distance is different. Therefore, it is also the same as the contour of the outer surface of the support rod model 11 in the depth direction. Due to the offset distance, after the machining path is generated, the tool 20 performs machining in the depth direction according to the shape of the machining contour surface 30, and the machining depth is determined according to the offset first distance, so that the machined surface is similar to the contour shape of the outer surface of the support rod model 11 in the depth direction, so that the machining contour surface 30 matches the outer surface of the support rod model 11, so that there is a uniform support rod reserved thickness between the machined contour surface and the outer surface, ensuring that the force on the support rod is relatively stable in each area during the cutting process, avoiding the problem of local fracture causing the crown to fall off with a large amount of support rod residue when it is not fully machined.

[0060] According to the cutting strategy, this embodiment can be divided into two forms: single-sided cutting and double-sided cutting, as follows:

[0061] In the form of single-sided cutting, such as Figure 1 , Figure 2 As shown, step S200 specifically includes the following steps:

[0062] Step S201: Determine a first reference datum curved surface according to the bottom surface of the back-knife side of the support rod model.

[0063] Step S202: offset the first reference datum plane by a first distance in the depth direction to generate a first processing contour surface, wherein the first distance is a reserved thickness of the support rod.

[0064] In the specific process of the above steps S201-S202, if Figure 3As shown, in the single-sided cutting mode, the tool 20 is cut in steps from top to bottom, and the support rod model 11 to be processed is not flipped. Then the outer surface in the depth direction at this time is only the bottom surface of the back-tool side of the support rod model 11. In this embodiment, the side of the support rod model 11 facing the tool 20 in the depth direction is the tool-facing side (upper side), and the side facing away from the tool 20 in the depth direction is the back-tool side (lower side). In this way, the first reference datum plane is the lower surface of the support rod model 11. After the first reference datum plane is offset upward by a first distance, the first processing contour surface 31 is obtained, and the first processing contour surface 31 is the processing contour surface 30. When the subsequent production processing path is produced, the tool 20 is processed from top to bottom according to the step distance. After processing to the first processing contour surface 31, the reserved thickness of the retained support rod is equal to the first distance. The single-sided cutting method only retains a part of the lower part of the original support rod model 11. This processing method is simple.

[0065] In the form of double-sided cutting, such as Figure 1 , Figure 4 As shown, step S200 specifically includes the following steps:

[0066] Step S210: Determine a first reference datum curved surface according to the bottom surface of the back-knife side of the support rod model.

[0067] Step S211: offset the first reference datum plane upward along the depth direction by the bottom processing distance to generate a first processing contour surface.

[0068] Step S212: Determine a second reference datum curved surface according to the top surface of the support rod model on the knife-facing side.

[0069] Step S213, offset the second reference datum plane downward in the depth direction by the top processing distance to generate a second processing contour surface, wherein the first distance includes the bottom processing distance and the top processing distance, and the support rod reserved thickness = support rod model thickness - top processing distance - bottom processing distance.

[0070] In the above steps S210-S213, if Figure 5As shown, in the double-sided cutting mode, cutting is performed separately or simultaneously on the upper and lower sides in the depth direction. According to the bottom surface of the back-knife side (lower side) of the support rod model, the generated first reference datum surface 41 is the same as the contour of the bottom surface. After the first reference datum surface is offset upward in the depth direction, the first processing contour surface 31 is generated; when processing, the offset distance is the processing amount that needs to be processed from the bottom. According to the bottom surface of the knife side (upper side) of the support rod model, the generated second reference datum surface 42 is the same as the contour of the upper surface. After the second reference datum surface is offset downward in the depth direction, the second processing contour surface 32 is generated; when processing, the offset distance is the processing amount that needs to be processed from the top. Therefore, processing and cutting are performed from the upper and lower sides respectively, and the final support rod reserved thickness = support rod model 11 thickness - top processing distance - bottom processing distance.

[0071] The method of processing from both the upper and lower sides is adopted. During the processing, the tool first processes the upper part of the support rod according to the second processing contour. Then the crown is turned 180°, and the lower part is turned to the upper part without changing the tool, and the processing is performed according to the first processing contour, thereby realizing the processing of the lower part. In this way, the middle position of the support rod can be retained. The part in the middle position of the support rod is retained, and the force on the support rod is relatively stable during the cutting process, so that it is not easy to break before the cutting is completed, resulting in a large residual margin.

[0072] By processing on both sides, the upper cutting process can be divided into multiple steps, and the lower cutting process can be divided into multiple steps, and the multiple-step upper cutting process and the multiple-step lower cutting process are performed alternately. In this way, during the process of alternating cutting, the upper and lower cutting forces on the support rod are relatively stable, making the cutting process of the support rod more stable.

[0073] In addition, the upper and lower tools can be used for processing at the same time, so that the cutting force on the support rod is more stable during the processing.

[0074] The specific reserved thickness needs to be determined according to different materials. For example, when cutting a zirconia crown, the reserved thickness of the support rod can be 15% of the maximum diameter of the support rod model thickness. When cutting a metal crown, the reserved thickness of the support rod can be 1%-2% of the maximum diameter of the support rod model thickness, such as 0.3-0.4mm.

[0075] Step S300: Generate a machining path according to the machining contour surface, wherein the machining path is used to control a tool to machine the support rod.

[0076] In the specific process, the machining programming software can produce a machining path according to the machining contour surface and the set cutting parameters. The machining path (machining program) is imported into the CNC machine tool to control the tool to cut the support rod on the crown, so that only a small part of the support rod is retained, so that the operator can directly break it off. After breaking it off, it only needs a simple grinding process to grind off the little bit of residue.

[0077] Furthermore, the cutting angle of the tool in the processing path in this embodiment is an inclined cutting angle. Because the crown surface is inclined or uneven, the vertical cutting of the needle is changed to an inclined cutting angle to prevent the needle from going straight in, thereby preventing the tool from breaking and overcutting.

[0078] Furthermore, if Figure 7 As shown, the cutting angle is determined according to the inclination a of the surface of the digital processing model of the crown at the support rod model. In particular, the connection between the outer contour of the support rod model and the digital processing model of the crown needs to be processed at the cutting angle during the cutting process. The maximum protrusion of the contour of the digital processing model of the crown toward the side of the support rod model is calculated, and the inclination a can be calculated according to the maximum protrusion and the distance from the surface of the support rod model to the maximum protrusion in the depth direction. Cutting according to the determined inclination a can make the cutting angle of the needle smaller than the inclination, thereby ensuring that the end of the support rod connected to the crown can be cut, and the problems of tool breakage and overcutting are avoided. The cutting angle of this embodiment is 3°-5°. With this cutting angle, the problems of tool breakage and overcutting can be effectively prevented.

[0079] The cutter of this embodiment uses a 1.0mm / 1.5mm / 2.0mm ball cutter, and the cutting step of each layer needs to be specially designed. Figure 6 As shown, in step S300, the following steps are also specifically included:

[0080] Step S310: Determine the step-down distance of the tool in the processing path according to the material of the digital processing model of the crown.

[0081] Commonly used crown digital processing models include: zirconia crown and metal crown. For two different materials, set different downcutting step distances. The details are as follows:

[0082] The down-cutting step distance of the zirconia crown is: 0.1-0.2mm. In addition, it should be noted that the down-cutting step distance refers to the amount of cutting each time. Since the zirconia crown has a relatively small spring during the cutting process and is relatively easy to cut, a larger down-cutting step distance can be used. However, when the remaining amount of the support rod is getting smaller and smaller, a larger cutting step distance will cause a greater cutting extrusion force on the support rod. Therefore, in this embodiment, when cutting the zirconia crown, as the depth increases, the down-cutting step distance is made smaller and smaller, that is, the maximum preset value is first used for cutting, and then gradually reduced to the minimum preset value for cutting. In this way, at the end of cutting, when the support rod becomes smaller, the cutting force on the support rod is relatively small, thereby avoiding the problem of local fracture causing the crown to fall off with a large amount of support rod remaining when it is not fully processed.

[0083] The step down distance of metal crown is 0.08mm. Metal crowns are usually titanium alloy crowns. Since metal is elastic, the smaller the step down distance, the smaller the spring of the knife. Under a relatively small step down distance, the support rod of titanium alloy can be cut off very stably.

[0084] Step S320: Determine the feed speed of the tool in the processing path according to the material of the digital processing model of the crown, wherein the feed speed of the zirconia crown is 600-1000 mm / r, and the feed speed of the metal crown is 1000-1500 mm / r.

[0085] For zirconia crowns, the feed rate is 600-1000mm / r. Because zirconia is a powder die-casting, too large a step down and too fast a feed rate can easily cause cracking. Therefore, during the processing, as the processing depth increases, the feed rate gradually decreases to avoid cracking.

[0086] For metal crowns, the feed speed is 1000-1500mm / r. When cutting metal, a 2.0mm ball cutter is used for cutting, and the feed rate is 1000-1500mm / r. Because the metal is elastic and the metal hardness is high, a relatively high feed rate is used to improve work efficiency.

[0087] In the above steps S100-S300, the machining contour surface is determined according to the outer surface of the support rod model in the depth direction on the digital machining model of the crown, so that the machining contour surface matches the outer surface of the support rod model, thereby determining the machining boundary range and the machining depth through the machining contour surface; since the machining contour surface and the outer surface of the support rod model are separated by a first distance, the first distance is determined according to the reserved thickness of the support rod that needs to be retained, so that there is a uniform reserved thickness of the support rod between the machined contour surface and the outer surface, ensuring that the force on the support rod is relatively stable in each area during the cutting process, avoiding the problem of local fracture causing the crown to fall off with a large amount of support rod residue when it is not fully machined. Finally, a machining path is generated according to the machining contour surface, wherein the machining path is used to control the tool to machine the support rod. In this way, an automatic cutting machining path is formed. When the crown is cut normally, as shown in FIG. Figure 8 As shown in (a), support rod cutting can be performed. Figure 8 As shown in (b), the support rod retains a very small margin (reserved thickness of the support rod), so that the operator can easily break the processed crown from the plate, thereby replacing the method of grinding the support rod with a manual handcart, avoiding the problem of manual processing of the support rod easily causing damage to the crown, improving the quality of the processed crown, and making the quality of the crown processing uniform. In addition, the production process is basically completed by digital programming and processing. The dust and block particles in the process of processing by the CNC machine tool are blocked by the machine tool, and basically will not be shot into the eyes to cause injuries to people, making the processing process safer and more reliable.

[0088] Embodiment 2

[0089] like Fig. 9 As shown, this embodiment proposes a cutting system for facilitating the removal of a crown, which includes a cutting machine 65, at least one processor 60 (processor), a display screen 61 and a memory 62 (memory), and may also include a communication bus, wherein the communication bus includes a communication interface 64 (Communications Interface) and a bus 63. The processor 60, the display screen 61, the memory 62 and the communication interface 64 can communicate with each other through the bus 63. The display screen 61 is configured to display a user operation interface and a related three-dimensional software interface. The communication interface can transmit information. The processor 60 can call the logic instructions in the memory to control the cutting machine 65 to execute the cutting method for facilitating the removal of a crown in the above embodiment.

[0090] In addition, the logic instructions in the above-mentioned memory 62 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. The memory, as a computer-readable storage medium, can be configured to store software programs, computer executable programs, such as program instructions or modules corresponding to the method in the embodiment of the present disclosure. The processor executes functional applications and data processing by running the software programs, instructions or modules stored in the memory, that is, implementing the cutting method for facilitating the removal of the crown in the above-mentioned embodiment.

[0091] The memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal system, etc. In addition, the memory may include a high-speed random access memory and may also include a non-volatile memory. For example, a variety of media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, may also be a transient storage medium.

[0092] In addition, the specific process of loading and executing the plurality of instructions in the storage medium and the processor in the mobile terminal has been described in detail in the method above, and will not be described one by one here.

[0093] In summary, the present application provides a cutting method and system for disassembling a crown, which controls the processing range and processing depth through the surface group of the processing programming software, and automatically generates the processing boundary on the surface of the support rod by adding a support rod through the software. The tool movement trajectory is only within the bottom range of the support rod, and the depth is controlled by the processing value set by the surface group. In this way, automatic control of the processing tool is realized, and the production process is basically completed by digital programming. The dust and block particles in the process of processing by the CNC machine tool are blocked by the machine tool, and basically will not be shot into the eyes to cause injuries to people, making the processing process safer and more reliable.

[0094] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A cutting method for facilitating the removal of a dental crown, characterized in that: The method comprises the steps of: Acquire a digital processing model of a dental crown, wherein the digital processing model of the dental crown has a support rod model; Determine a machining contour surface according to the outer surface of the support rod model in the depth direction, wherein the machining contour surface is used to limit the machining boundary range and the machining depth, and the machining contour surface is spaced a first distance from the outer surface of the support rod model, and the first distance is determined according to a reserved thickness of the support rod that needs to be retained; A machining path is generated according to the machining contour surface, wherein the machining path is used to control a tool to machine the support rod.

2. The cutting method for facilitating removal of a dental crown according to claim 1, characterized in that: The step of determining a machining contour surface according to the outer surface of the support rod model in the depth direction comprises: Determine a reference datum curved surface according to the outer surface of the support rod model in the depth direction, wherein the reference datum curved surface matches the outer contour of the outer surface of the support rod model in the depth direction; According to the reserved thickness of the support rod, the reference datum plane is offset by a first distance in the depth direction to generate a machining contour surface.

3. The cutting method for facilitating removal of a dental crown as claimed in claim 2, characterized in that: In the step of determining a machining contour surface according to the outer surface of the support rod model in the depth direction: Determine a first reference datum curved surface according to the bottom surface of the back-knife side of the support rod model; The first reference datum plane is offset by a first distance in a depth direction to generate a first processing contour surface, wherein the first distance is a reserved thickness for the support rod.

4. The cutting method for facilitating removal of a dental crown as claimed in claim 2, characterized in that: In the step of determining a machining contour surface according to the outer surface of the support rod model in the depth direction: Determine a first reference datum curved surface according to the bottom surface of the back-knife side of the support rod model; The first reference datum plane is offset upwards in the depth direction by a bottom processing distance to generate a first processing contour surface; Determine a second reference datum curved surface according to the top surface of the support rod model on the knife-facing side; The second reference datum plane is offset downwardly in the depth direction by a top processing distance to generate a second processing contour surface; The first distance includes a bottom processing distance and a top processing distance, and the reserved thickness of the support rod = support rod model thickness - top processing distance - bottom processing distance.

5. The cutting method for facilitating removal of a dental crown as claimed in claim 4, characterized in that: According to the machining contour surface, the steps of generating a machining path are: The cutting angle of the tool in the processing path is an inclined cutting.

6. The cutting method for facilitating removal of a dental crown as claimed in claim 5, characterized in that: The cutting angle is determined according to the inclination of the surface of the digitally processed model of the crown at the support rod model, and the cutting angle is 3°-5°.

7. The cutting method for facilitating removal of a dental crown according to claim 6, characterized in that: According to the machining contour surface, the step of generating a machining path also includes: The step-down distance of the tool in the machining path is determined according to the material of the digital machining model of the dental crown.

8. The cutting method for facilitating removal of a dental crown as claimed in claim 7, characterized in that: In the step of determining the step-down distance of the tool in the machining path according to the material of the digital machining model of the dental crown: The digital processing model of the dental crown includes: a zirconia dental crown and a metal dental crown, wherein the undercutting step of the zirconia dental crown is 0.1-0.2 mm; The step down distance of the metal crown is 0.08mm.

9. The cutting method for facilitating removal of a dental crown as claimed in claim 8, characterized in that: According to the machining contour surface, the step of generating a machining path also includes: The feed speed of the tool in the processing path is determined according to the material of the digital processing model of the crown, wherein the feed speed of the zirconia crown is 600-1000mm / r, and the feed speed of the metal crown is 1000-1500mm / r.

10. A cutting system for facilitating removal of a dental crown, characterized in that: include: Cutting machine tools, processors, memories and communication buses; The memory stores a computer-readable program executable by the processor; The communication bus realizes the connection and communication between the processor and the memory; When the processor controls the cutting machine to execute the computer-readable program, the steps of the cutting method for facilitating the removal of a dental crown as described in any one of claims 1 to 9 are implemented.

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