Manufacturing method and manufacturing device for cutting false tooth without connecting rod

Abstract

The invention provides a connecting-rod-free manufacturing method and device for cutting false teeth, and the manufacturing method comprises the steps: carrying out connecting-rod-free cutting on a ceramic disc, and bonding the false teeth by adopting a bonding medium in the connecting-rod-free cutting; the local tensile stress of the bonding medium is smaller than or equal to 30 MPa, and the bonding force of the bonding medium is larger than or equal to 1 MPa; the manufacturing device comprises a connecting-rod-free cutting unit used for carrying out bonding fixation and processing on false teeth by adopting a bonding medium; the medium removing unit is used for removing a bonding medium on the surface of the false tooth; the sintering unit is used for sintering the false tooth. According to the invention, the phenomenon of cracking on the surface of the false tooth can be reduced while the false tooth is cut without a connecting rod, the cutting success rate is improved, the manufacturing time is further shortened, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of dental prosthesis processing technology, and in particular to a method and apparatus for manufacturing cut dental prostheses without connecting rods. Background Technology

[0002] Dentures are artificial teeth placed to restore chewing, aesthetics, and speech functions after teeth have been lost or extracted. Medically, they are a general term for restorations made after partial or complete loss of the upper and lower jaws.

[0003] Currently, connecting rods are used to fix the layout during the process of forming dentures from ceramic discs. However, due to the small size of the denture structure, these connecting rods need to be removed manually afterward, which is time-consuming and the manual polishing process can easily damage the surface of the denture.

[0004] Manual denture production is slow and inefficient, resulting in low product yield and making it difficult to meet the demands of denture processing. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a manufacturing method and apparatus for cutting dentures without connecting rods, which can reduce the crack rate of zirconia denture surfaces in automated cutting dentures without connecting rods, further improve production efficiency, and allow for the recycling of the medium, thus having broad application prospects.

[0006] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for manufacturing a shankless denture, the method comprising: performing shankless machining on a ceramic disc, wherein the shankless machining is performed by bonding the denture with an adhesive medium. The local tensile stress of the adhesive medium is ≤30MPa, and the adhesive force of the adhesive medium is ≥1MPa.

[0007] Currently, the production speed of manually operated dentures is slow and the work efficiency is low. To address this, the applicant has developed a method for cutting dentures without connecting rods, which can improve production efficiency, reduce manpower, and achieve mechanized production.

[0008] In the process of cutting without connecting rods, dentures are bonded using an adhesive medium, which enables mechanized production. However, different adhesive media can easily affect zirconia dentures. Research has found that the adhesive medium generates local tensile stress during the curing process. When the local tensile stress of the adhesive medium is within the above-mentioned range, it can reduce the crack rate on the surface of the zirconia denture and improve the surface integrity of the denture in mechanized production. When the adhesive force of the adhesive medium is within the above-mentioned range, it can ensure that the denture is firmly fixed during processing and improve production stability.

[0009] For example, the local tensile stress of the adhesive medium is ≤30MPa, such as 1MPa, 5MPa, 8MPa, 11MPa, 14MPa, 18MPa, 21MPa, 24MPa, 27MPa or 30MPa, but not limited to the listed values, and other unlisted values ​​within this range are also applicable; and the adhesive force of the adhesive medium is ≥1MPa, such as 1MPa, 2MPa, 3MPa, 4MPa, 5MPa, 6MPa, 7MPa, 8MPa, 9MPa or 10MPa, but not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0010] Preferably, the kinematic viscosity of the bonding medium at 100°C is 10~15 mm. 2 / s, for example, could be 10mm 2 / s, 10.6mm 2 / s, 11.2mm 2 / s, 11.7mm 2 / s, 12.3mm 2 / s, 12.8mm 2 / s, 13.4mm 2 / s, 13.9mm 2 / s, 14.5mm 2 / s or 15mm 2 / s, etc., but not limited to the listed values, other unlisted values ​​within this range also apply.

[0011] Research has shown that when the kinematic viscosity of the bonding medium is within the above-mentioned range, it can minimize the penetration into the zirconia surface during the production process, thereby reducing the carbon content of the zirconia denture after sintering, improving the service life of the denture and its biocompatibility during service.

[0012] Preferably, the melting point of the adhesive medium is 70~130℃, for example, it can be 70℃, 77℃, 84℃, 90℃, 97℃, 104℃, 110℃, 117℃, 124℃ or 130℃, etc., but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0013] The present invention further preferably uses a bonding medium with a melting point within the above-mentioned range, which facilitates cooling and curing on the one hand, and takes into account the temperature resistance of the equipment and energy consumption on the other hand.

[0014] Preferably, the bonding medium is microcrystalline wax.

[0015] Research has shown that using microcrystalline wax with a specific melting point as a bonding medium not only leaves no residue on the surface of zirconia dentures, but also has minimal impact on the dentures throughout the entire production process, resulting in strong bonding during the cutting process and a low crack rate in the dentures.

[0016] As a preferred technical solution of the present invention, the manufacturing method includes the following steps: A ceramic disc is subjected to rodless cutting, in which a bonding medium is used to bond the denture, resulting in a first denture with a bonding medium. The bonding medium on the surface of the denture is removed to obtain a second denture; The second denture is sintered to obtain the denture product.

[0017] Research has revealed that cutting debris (zirconia material) is generated during the cutting process. This debris adheres to the bonding medium. If the bonding medium is not removed first, the zirconia cutting debris will easily adhere to the zirconia denture during the subsequent direct sintering process, and the residual bonding medium will also adhere to the denture, resulting in a high carbon content in the final denture.

[0018] Preferably, the adhesive medium for removing the denture surface includes: the first denture being subjected to a first negative pressure heat treatment, a second fluid cleaning, and a third drying in sequence.

[0019] By employing the above steps to remove and recycle the adhesive medium, this invention enables the secondary recycling of the adhesive medium.

[0020] The method for removing the bonding medium from the surface of dentures according to this invention comprises the steps described above. In the first negative pressure heat treatment, the temperature is raised above the melting point of the bonding medium, causing it to essentially melt and flow into a medium recovery tank for recycling. The second fluid cleaning step further cleans the remaining zirconia on the denture surface, further removing residual bonding medium and reducing white spots on the sintered denture surface. The third drying step gently removes residual liquid phase from the denture surface, thereby reducing the crack rate.

[0021] It should be noted that since a bonding medium is placed in the gap before the second processing, which is essentially the cutting of the zirconia ceramic disc, cutting debris is generated during the cutting process. This debris adheres to the bonding medium. Therefore, during the recycling process, the bonding medium recovered in the recycling tank after melting essentially contains residual zirconia debris. When recycling the bonding medium, it is necessary to filter it promptly after melting to obtain a large quantity of bonding medium. For the bonding medium obtained through the second fluid cleaning, it can be exemplarily passed through a 300-mesh sieve after melting, filtered under pressure, the filtered water kept warm, and then the water vapor discharged. The molten bonding medium can then be passed into a storage container at room temperature for reuse.

[0022] Preferably, the pressure of the first negative pressure heat treatment is 0.3~0.8MPa, for example, it can be 0.3MPa, 0.36MPa, 0.42MPa, 0.47MPa, 0.53MPa, 0.58MPa, 0.64MPa, 0.69MPa, 0.75MPa or 0.8MPa, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0023] Preferably, the temperature T1 of the first negative pressure heat treatment is greater than the melting point T2 of the bonding medium.

[0024] Preferably, the temperature T1 of the first negative pressure heat treatment and the melting point T2 of the bonding medium satisfy T1-T2≥30℃, for example, it can be 30℃, 33℃, 35℃, 37℃, 39℃, 42℃, 44℃, 46℃, 48℃ or 50℃, etc., but are not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0025] The present invention preferably satisfies the temperature T1 of the first negative pressure heat treatment and the melting point T2 of the bonding medium as T1-T2≥30℃, so that the bonding medium bonded to the denture surface melts as soon as possible, reduces the time of the first negative pressure heat treatment, improves production efficiency, and can fully remove the bonding medium from the denture surface in the first negative pressure heat treatment step, reducing the negative impact on the sintered denture.

[0026] Preferably, the duration of the first negative pressure heat treatment is 10 to 60 minutes, for example, it can be 10 minutes, 16 minutes, 22 minutes, 27 minutes, 33 minutes, 38 minutes, 44 minutes, 49 minutes, 55 minutes or 60 minutes, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0027] Preferably, during the first negative pressure heat treatment, the bonding medium melts and flows from the surface of the first denture into the medium recovery tank.

[0028] Preferably, the second fluid cleaning includes: a denture placement component containing the first denture entering a cleaning tunnel, and fluid being introduced into the cleaning tunnel through an air hole to rinse away the adhesive medium remaining on the surface of the first denture.

[0029] Preferably, the temperature of the second fluid cleaning is 120~180℃, for example, it can be 120℃, 127℃, 134℃, 140℃, 147℃, 154℃, 160℃, 167℃, 174℃ or 180℃, etc., but is not limited to the listed values, and other unlisted values ​​in this range are also applicable.

[0030] The present invention preferably controls the temperature of the second fluid cleaning within the above-mentioned range, which is more conducive to the formation of vaporized fluid, improves heat transfer efficiency, more effectively removes the adhesive medium remaining on the denture surface, and takes into account energy consumption.

[0031] Preferably, the second fluid cleaning time is 30 to 60 minutes, for example, it can be 30 minutes, 34 minutes, 37 minutes, 40 minutes, 44 minutes, 47 minutes, 50 minutes, 54 minutes, 57 minutes or 60 minutes, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0032] Preferably, the pressure of the second fluid cleaning is 0.3~0.4MPa, for example, it can be 0.3MPa, 0.32MPa, 0.33MPa, 0.34MPa, 0.35MPa, 0.36MPa, 0.37MPa, 0.38MPa, 0.39MPa or 0.4MPa, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0033] Preferably, the fluid in the second fluid cleaning includes any one or a combination of at least two of air, steam, or a dewaxing agent, wherein typical but non-limiting combinations are a combination of air and steam, a combination of air and a dewaxing agent, or a combination of a dewaxing agent and steam.

[0034] Preferably, the dewaxing agent comprises n-hexane and / or n-heptane.

[0035] Preferably, the temperature of the third drying is 120~180℃, for example, it can be 120℃, 127℃, 134℃, 140℃, 147℃, 154℃, 160℃, 167℃, 174℃ or 180℃, etc., but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0036] Preferably, the third drying time is 60 to 120 minutes, for example, it can be 60 minutes, 67 minutes, 74 minutes, 80 minutes, 87 minutes, 94 minutes, 100 minutes, 107 minutes, 114 minutes or 120 minutes, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0037] Preferably, the sintering includes a first heating stage, a second heating stage, and a holding stage.

[0038] Preferably, the heating rate of the first heating stage is 40~60℃ / min, for example, it can be 40℃ / min, 42℃ / min, 45℃ / min, 48℃ / min, 49℃ / min, 50℃ / min, 53℃ / min, 55℃ / min, 57℃ / min, 59℃ / min or 60℃ / min, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0039] Preferably, the final temperature of the first heating stage is 1000~1100℃, for example, it can be 1000℃, 1012℃, 1023℃, 1034℃, 1045℃, 1056℃, 1067℃, 1078℃, 1089℃ or 1100℃, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0040] Preferably, the heating rate of the second heating stage is 1~10℃ / min, for example, it can be 1℃ / min, 2℃ / min, 3℃ / min, 4℃ / min, 5℃ / min, 6℃ / min, 7℃ / min, 8℃ / min, 9℃ / min or 10℃ / min, etc., but is not limited to the listed values, and other unlisted values ​​in this range are also applicable.

[0041] Preferably, the final temperature of the second heating stage is 1500~1600℃, for example, it can be 1500℃, 1512℃, 1523℃, 1534℃, 1545℃, 1556℃, 1567℃, 1578℃, 1589℃ or 1600℃, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0042] Preferably, the heat preservation stage lasts for 50 to 70 minutes, for example, 50 minutes, 53 minutes, 55 minutes, 57 minutes, 59 minutes, 62 minutes, 64 minutes, 66 minutes, 68 minutes, or 70 minutes, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0043] Preferably, the rodless cutting of the ceramic disc includes: The first surface of the ceramic disc is processed according to the layout path to form a preliminary denture. The first surfaces of the preliminary denture have gaps between them, and the second surfaces of the preliminary denture are connected to each other, with the first and second surfaces positioned opposite each other. Fill the gaps in the preliminary denture with bonding medium; The ceramic disc, after being filled with bonding medium, is flipped over, and the second side of the flipped ceramic disc is processed a second time to form the first denture.

[0044] Preferably, the gap between adjacent dentures in the layout path is 3 to 5 mm, for example, it can be 3 mm, 3.3 mm, 3.5 mm, 3.7 mm, 3.9 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm or 5 mm, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0045] Preferably, the first surface is the root of the denture.

[0046] Preferably, the second surface is the cusp of the denture.

[0047] Preferably, filling the gaps in the preliminary denture with an adhesive medium includes: The bonding medium in the medium storage chamber is heated to a first temperature and kept at a first temperature. The gas valve is opened to control the internal pressure of the medium storage chamber. The first automatic dispensing is performed in the gap of the preliminary denture according to the dispensing path until it is level with the height of the processed surface; After the first interval, a second automatic dispensing is performed in the gap of the preliminary denture according to the dispensing path until it is level with the processing surface again, and then cured.

[0048] It is worth noting that the bonding medium shrinks during the curing process, which causes gaps to reappear between the initial dentures. The present invention performs a second automatic dispensing to improve support, thereby reducing the likelihood of dentures falling off during the subsequent second-side processing and improving the denture processing accuracy.

[0049] Preferably, the first temperature T3 is greater than the melting point T2 of the adhesive medium. Preferably, the first temperature T3 and the melting point T2 of the adhesive medium satisfy T3-T2≥30℃, for example, it can be 30℃, 33℃, 35℃, 37℃, 39℃, 42℃, 44℃, 46℃, 48℃ or 50℃, etc., but are not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0050] The present invention preferably sets the first temperature T3 to be at least 30°C higher than the melting point of the adhesive medium, which is sufficient to make the adhesive medium melt into a liquid state quickly, so that dispensing can be performed with a shorter heat preservation time, resulting in higher production efficiency.

[0051] Preferably, the duration of the first heat preservation is 5 to 10 minutes, for example, it can be 5 minutes, 5.6 minutes, 6.2 minutes, 6.7 minutes, 7.3 minutes, 7.8 minutes, 8.4 minutes, 8.9 minutes, 9.5 minutes or 10 minutes, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0052] Preferably, the internal pressure is 0.1~0.2MPa, for example, it can be 0.1MPa, 0.12MPa, 0.13MPa, 0.14MPa, 0.15MPa, 0.16MPa, 0.17MPa, 0.18MPa, 0.19MPa or 0.2MPa, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0053] Preferably, the speeds of the first and second automatic dispensing systems are each independently 10-25 mL / min, for example, 10 mL / min, 12 mL / min, 14 mL / min, 15 mL / min, 17 mL / min, 19 mL / min, 20 mL / min, 22 mL / min, 24 mL / min, or 25 mL / min, but are not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0054] The present invention preferably controls the speed of the first automatic dispensing and the second automatic dispensing within a reasonable range. When the spraying speed is too high, it is easy to cause liquid splashing of the adhesive medium, resulting in the loss of the adhesive medium. Moreover, the splashed adhesive medium is easy to adhere to the surface of the fixture or instrument and solidify, causing wear or damage, which affects subsequent cutting. When the spraying speed is too slow, it will affect production efficiency.

[0055] Preferably, the first duration is 40~120s, for example, it can be 40s, 49s, 58s, 67s, 76s, 85s, 94s, 103s, 112s or 120s, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0056] Preferably, the curing method includes cooling.

[0057] Preferably, the cooling time is 5 to 10 minutes, for example, it can be 5 minutes, 5.6 minutes, 6.2 minutes, 6.7 minutes, 7.3 minutes, 7.8 minutes, 8.4 minutes, 8.9 minutes, 9.5 minutes or 10 minutes, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0058] Preferably, the temperature of the cooled ceramic disc is ≤35℃, for example, it can be 10℃, 13℃, 16℃, 19℃, 22℃, 24℃, 27℃, 30℃, 33℃ or 35℃, etc., but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0059] Preferably, the ceramic disc is made of zirconia ceramic.

[0060] Preferably, the manufacturing method further includes generating a typesetting path.

[0061] Preferably, the layout path includes a first processing path for processing the first side and a second processing path for processing the second side.

[0062] Preferably, the first processing path and the second processing path can be the same or different.

[0063] Preferably, the second processing includes: cutting the second surface of the ceramic disk and cutting the bonding medium.

[0064] As a preferred technical solution of the present invention, the manufacturing method includes the following steps: S1. Generate layout path; S2. The first surface of the ceramic disc is processed according to the layout path to form a preliminary denture; there are gaps between the first surfaces of the preliminary denture, and the second surfaces of the preliminary denture are connected to each other, with the first surface and the second surface facing each other; the first surface is the root of the denture; the second surface is the tip of the denture. S3. Filling the gaps in the preliminary denture with an adhesive medium; the filling of the gaps in the preliminary denture with an adhesive medium includes: S31. Heat the bonding medium in the medium storage chamber to a first temperature and maintain the temperature for 5-10 minutes. Open the gas valve to control the internal pressure of the medium storage chamber to 0.1-0.2 MPa. The first temperature T3 and the melting point T2 of the bonding medium satisfy T3-T2≥30℃. S32. Perform the first automatic dispensing in the gap of the preliminary denture according to the dispensing path until it is level with the height of the processing surface; S33. After an interval of 40-120 seconds, perform a second automatic dispensing in the gap of the preliminary denture according to the dispensing path until the height is level with the processing surface again. Then, cool for 5-10 minutes until the temperature of the ceramic disc is ≤35℃ for curing. The speed of the first and second automatic dispensing is 10-25 mL / min, respectively. S4. Flip the ceramic disc after filling it with bonding medium, perform a second processing on the second surface of the flipped ceramic disc, and cut the bonding medium to form the first denture. S5. Remove the bonding medium from the surface of the denture to obtain a second denture; the bonding medium removed from the surface of the denture includes: S51. The first denture is subjected to a first negative pressure heat treatment for 10 to 60 minutes under a pressure of 0.3 to 0.8 MPa. The temperature T1 of the first negative pressure heat treatment and the melting point T2 of the bonding medium satisfy T1-T2≥30℃. During the first negative pressure heat treatment, the bonding medium melts and flows from the surface of the first denture into the medium recovery tank. S52. The denture placement component containing the first denture enters the cleaning tunnel. Fluid with a pressure of 0.3~0.4MPa and a temperature of 120~180℃ is introduced into the cleaning tunnel through the air hole to rinse the adhesive medium remaining on the surface of the first denture. The rinsing time is 30~60 minutes. S53. The denture placement component containing the first denture is placed in a forced-air drying oven and dried at 120~180℃ for 60~120 minutes to obtain the second denture with the adhesive medium removed.

[0065] S6. Place the second denture in the sintering unit, first raise the temperature to 1000-1100℃ at 40-60℃ / min, then raise the temperature to 1500-1600℃ at 1-10℃ / min, and hold at 1500-1600℃ for 50-70 minutes to sinter, and obtain the denture product.

[0066] The manufacturing method for making cut dentures without connecting rods as described in the first aspect of the present invention can be carried out using the manufacturing apparatus for making cut dentures without connecting rods as described in the second aspect.

[0067] Secondly, the present invention provides a manufacturing apparatus for machining dentures without connecting rods, the manufacturing apparatus comprising: A rodless cutting unit is used for bonding and fixing dentures together using an adhesive medium.

[0068] The media removal unit is used to remove the bonding media from the surface of the denture.

[0069] Sintering unit, used for sintering dentures.

[0070] Preferably, the media removal unit includes a denture placement component, and sequentially includes a first media removal section, a second media removal section, and a third drying section along the denture processing steps. The denture placement component sequentially passes through the first media removal section, the second media removal section, and the third drying section to perform the first media removal, the second media removal, and the third drying.

[0071] Preferably, the denture placement component includes a denture tray and a media collection section disposed at the bottom of the denture tray, and the bottom of the denture tray has a mesh structure.

[0072] Preferably, the media recovery unit includes a media recovery tank.

[0073] Preferably, the first medium removal section includes a drying oven.

[0074] Preferably, the second medium removal section includes a cleaning tunnel, which has a plurality of air holes for the passage of cleaning fluid.

[0075] Preferably, the second medium removal section further includes a cleaning fluid conveying device connected to the cleaning tunnel.

[0076] Preferably, the second medium removal section includes a housing, and the cleaning tunnel is placed inside the housing.

[0077] Preferably, the top of the housing is provided with an exhaust port.

[0078] Preferably, a denture placement section is provided in the middle of the cleaning tunnel for placing dentures.

[0079] Preferably, a cleaning medium storage tank and a medium recovery tank are sequentially provided at the bottom of the housing.

[0080] Preferably, the cleaning medium storage tank is connected to the heating vessel through a cleaning medium return pipe, and the steam generated by the heating vessel is transported to the upper part of the cleaning tunnel through a steam pipe.

[0081] Preferably, a circulation pipe is provided at the top of the cleaning tunnel, and the circulation pipe is provided with air holes for the cleaning medium to pass through.

[0082] Preferably, the third drying section includes a forced-air drying oven.

[0083] Preferably, the rodless cutting unit includes: The processing unit includes at least one processing module, which performs a first processing on a first surface of a ceramic disc according to a layout path to form a preliminary denture. The first surfaces of the preliminary denture have gaps between them, and the second surfaces of the preliminary denture are interconnected, with the first and second surfaces positioned opposite each other.

[0084] The adhesive application section is used to fill the gaps in the preliminary denture with adhesive medium.

[0085] The flipping section is used to flip the ceramic disc after the adhesive coating section has been filled with the bonding medium.

[0086] The processing unit is also used to perform a second processing on the second surface of the flipped ceramic disc to form the first denture.

[0087] The control system is used to control the processing operations of the machining section, the gluing section, and the flipping section according to the process.

[0088] Preferably, the machining section includes a cutting machine.

[0089] Preferably, the cutting machine includes a 5-axis cutting machine and / or a 6-axis cutting machine.

[0090] Preferably, the processing module has a built-in first processing path for processing the first surface, and the processing module has a built-in second processing path for processing the second surface.

[0091] Preferably, the adhesive coating section includes a medium storage chamber and a medium delivery pipe connected to the medium storage chamber, and the medium storage chamber is provided with a gas valve for controlling the pressure inside the medium storage chamber.

[0092] Preferably, the adhesive coating section further includes a heat insulation section disposed outside the medium storage cavity.

[0093] Preferably, the adhesive coating section further includes a temperature control device disposed on the insulation section.

[0094] Preferably, the control system includes an adhesive application program, which controls the air valve to perform the adhesive application process.

[0095] Preferably, the adhesive application process includes at least two adhesive application steps.

[0096] Preferably, the adhesive application process includes a first adhesive application process and a second adhesive application process.

[0097] Compared with the prior art, the present invention has at least the following beneficial effects: (1) The manufacturing method of cutting dentures without connecting rods provided by the present invention can significantly reduce the crack rate on the surface of zirconia dentures by selecting a specific bonding medium, wherein the crack rate on the surface of zirconia dentures is preferably ≤10%, and the residual carbon content in dentures is reduced, wherein the carbon content of dentures is preferably reduced to 0.

[0098] (2) The manufacturing method of cutting dentures without connecting rods provided by the present invention can significantly improve the heating rate during the sintering process by first removing the bonding medium on the surface of the denture and then sintering, thereby improving the overall production efficiency and shortening the production time. Attached Figure Description

[0099] Figure 1 This is a flowchart of the manufacturing method for cutting dentures without connecting rods provided by the present invention.

[0100] Figure 2 This is a schematic diagram of the second media removal unit in the manufacturing apparatus for cutting dentures without connecting rods provided by the present invention.

[0101] In the diagram: 1. Heating vessel; 2. Cleaning medium return pipe; 3. Cleaning medium storage tank; 4. Medium recovery tank; 5. Denture placement section; 6. Circulation pipe; 7. Exhaust port; 8. Steam pipe. Detailed Implementation

[0102] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0103] It should be understood that in the description of this invention, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0104] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0105] Those skilled in the art should understand that the present invention necessarily includes the necessary pipelines, conventional valves and general pump equipment for achieving complete process, but the above content is not the main inventive point of the present invention. Those skilled in the art can add layouts based on process flow and equipment structure selection, and the present invention does not make any special requirements or specific limitations in this regard.

[0106] Example A1 This embodiment provides a manufacturing apparatus for machining dentures without connecting rods, the manufacturing apparatus comprising: A connecting rodless cutting unit is used for bonding and fixing dentures together using an adhesive medium; the connecting rodless cutting unit includes: The processing unit includes at least one processing module, which performs a first processing on the first surface of the ceramic disc according to the layout path to form a preliminary denture; the first surfaces of the preliminary denture have gaps between them, the second surfaces of the preliminary denture are connected to each other, and the first surfaces and the second surfaces are arranged opposite to each other.

[0107] The adhesive application section is used to fill the gaps in the preliminary denture with adhesive medium. The adhesive application section includes a medium storage chamber and a medium delivery pipe connected to the medium storage chamber. The medium storage chamber is equipped with an air valve for controlling the pressure within the medium storage chamber. The adhesive application section also includes a heat insulation section located outside the medium storage chamber, and a temperature control device located on the heat insulation section.

[0108] The flipping section is used to flip the ceramic disc after the adhesive coating section has been filled with the bonding medium.

[0109] The processing unit is also used to perform a second processing on the second surface of the flipped ceramic disc to form the first denture.

[0110] The control system is used to control the processing operations of the machining section, the gluing section, and the flipping section according to the process. The control system includes a gluing program, which controls the air valve to perform the gluing process; the gluing program includes at least two gluing steps; the gluing program includes a first gluing step and a second gluing step.

[0111] A media removal unit is used to remove adhesive media from the surface of a denture. The media removal unit includes a denture placement component and, sequentially along the denture processing steps, a first media removal section, a second media removal section, and a third drying section. The denture placement component sequentially passes through the first media removal section, the second media removal section, and the third drying section to perform the first media removal, the second media removal, and the third drying. The denture placement component includes a denture tray and a media recovery section disposed under the denture tray. The bottom of the denture tray has a mesh structure. The media recovery section includes a media recovery tank. The first media removal section includes a drying chamber. Figure 2 As shown, the second medium removal section includes a cleaning tunnel with multiple vents for the passage of cleaning fluid. The second medium removal section also includes a cleaning fluid delivery device connected to the cleaning tunnel. Specifically, the second medium removal section includes a housing, with the cleaning tunnel placed inside the housing. An exhaust port 7 is provided at the top of the housing. A denture placement section 5 is provided in the middle of the cleaning tunnel for placing dentures. A cleaning medium storage tank 3 and a medium recovery tank 4 are sequentially provided at the bottom of the housing. The cleaning medium storage tank 3 is connected to the heating vessel 1 via a cleaning medium return pipe 2, and steam generated by the heating vessel 1 is transported to the upper part of the cleaning tunnel via a steam pipe 8. A circulation pipe 6 is provided at the upper part of the cleaning tunnel, and vents for the passage of the cleaning medium are provided on the circulation pipe 6.

[0112] The third drying section includes a blower drying oven.

[0113] Sintering unit, used for sintering dentures.

[0114] Example B1 This embodiment provides a method for manufacturing a cut-and-strut-free denture. The method uses the cut-and-strut-free denture manufacturing apparatus provided in Embodiment A1, and specifically includes the following steps: S1. Generate layout path; S2. The first surface of the ceramic disc (zirconia) is processed according to the layout path to form a preliminary denture; there are gaps between the first surfaces of the preliminary denture, the second surfaces of the preliminary denture are connected to each other, and the first surface and the second surface are arranged opposite to each other; the first surface is the root of the denture; the second surface is the tip of the denture. S3. Fill the gaps in the preliminary denture with an adhesive medium (select a microcrystalline wax with a melting point of 100℃, a local tensile stress of 7.0MPa, and an adhesive strength of 3.5MPa, and a kinematic viscosity of 11.7m at 100℃). 2 / s); the filling of the gaps in the preliminary denture with adhesive medium includes: S31. Heat the bonding medium in the medium storage chamber to a first temperature of 140°C and keep it at that temperature for 8 minutes. Open the air valve to control the internal pressure of the medium storage chamber to 0.15 MPa. S32. Perform the first automatic dispensing in the gap of the preliminary denture according to the dispensing path until it is level with the height of the processing surface; S33. After a first interval of 60 seconds, perform a second automatic dispensing in the gap of the preliminary denture according to the dispensing path until the height is level with the processing surface again, and then cool for 8 minutes until the temperature of the ceramic disc is 25°C for curing; the speed of the first automatic dispensing and the second automatic dispensing are both 15mL / min. S4. Flip the ceramic disc after filling it with bonding medium, perform a second processing on the second surface of the flipped ceramic disc, and cut the bonding medium to form the first denture. S5. Remove the bonding medium from the surface of the denture to obtain a second denture; the bonding medium removed from the surface of the denture includes: S51. The first denture is subjected to a first negative pressure heat treatment at 0.5MPa for 30 minutes, and the temperature T1 of the first negative pressure heat treatment is 140℃. During the first negative pressure heat treatment, the bonding medium melts and flows from the surface of the first denture into the medium recovery tank. S52. The denture placement component containing the first denture enters the cleaning tunnel. Fluid at a pressure of 0.35MPa and a temperature of 150℃ is introduced into the cleaning tunnel through the air hole to rinse the adhesive medium remaining on the surface of the first denture. The rinsing time is 40 minutes. S53. The denture placement component containing the first denture is placed in a forced-air drying oven and dried at 150°C for 80 minutes to obtain the second denture with the adhesive medium removed.

[0115] S6. Place the second denture in the sintering unit, first raise the temperature to 1050°C at 50°C / min, then raise the temperature to 1550°C at 5°C / min, and hold at 1550°C for 60 minutes to sinter, thereby obtaining the denture product.

[0116] Example B2 This embodiment provides a method for manufacturing a rodless, cut-and-strut denture. The method uses the rodless, cut-and-strut denture manufacturing apparatus provided in Embodiment A1, and the specific manufacturing method includes the following steps: S1. Generate layout path; S2. The first surface of the ceramic disc (zirconia) is processed according to the layout path to form a preliminary denture; there are gaps between the first surfaces of the preliminary denture, the second surfaces of the preliminary denture are connected to each other, and the first surface and the second surface are arranged opposite to each other; the first surface is the root of the denture; the second surface is the tip of the denture. S3. Fill the gaps in the preliminary denture with an adhesive medium (select a microcrystalline wax with a melting point of 70℃, a local tensile stress of 2.8MPa, and an adhesive strength of 3.0MPa, and a kinematic viscosity of 10.3m at 100℃). 2 / s); the filling of the gaps in the preliminary denture with adhesive medium includes: S31. Heat the bonding medium in the medium storage chamber to a first temperature of 100°C and keep it at that temperature for 10 minutes. Open the air valve to control the internal pressure of the medium storage chamber to 0.1 MPa. S32. Perform the first automatic dispensing in the gap of the preliminary denture according to the dispensing path until it is level with the height of the processing surface; S33. After a first interval of 40 seconds, perform a second automatic dispensing in the gap of the preliminary denture according to the dispensing path until the height is level with the processing surface again, and then cool for 5 minutes until the temperature of the ceramic disc is 30°C for curing; the speed of the first automatic dispensing and the second automatic dispensing are both 25 mL / min. S4. Flip the ceramic disc after filling it with bonding medium, perform a second processing on the second surface of the flipped ceramic disc, and cut the bonding medium to form the first denture. S5. Remove the bonding medium from the surface of the denture to obtain a second denture; the bonding medium removed from the surface of the denture includes: S51. The first denture is subjected to a first negative pressure heat treatment at 0.3 MPa for 60 minutes, and the temperature T1 of the first negative pressure heat treatment is 110℃. During the first negative pressure heat treatment, the bonding medium melts and flows from the surface of the first denture into the medium recovery tank. S52. The denture placement component containing the first denture enters the cleaning tunnel. Fluid at a pressure of 0.3MPa and a temperature of 120℃ is introduced into the cleaning tunnel through the air hole to rinse the adhesive medium remaining on the surface of the first denture. The rinsing time is 60 minutes. S53. The denture placement component containing the first denture is placed in a forced-air drying oven and dried at 180°C for 60 minutes to obtain the second denture with the adhesive medium removed.

[0117] S6. Place the second denture in the sintering unit, first raise the temperature to 1000℃ at 60℃ / min, then raise the temperature to 1500℃ at 10℃ / min, and hold at 1500℃ for 70 minutes to sinter, thereby obtaining the denture product.

[0118] Example B3 This embodiment provides a method for manufacturing a rodless, cut-and-strut denture. The method uses the rodless, cut-and-strut denture manufacturing apparatus provided in Embodiment A1, and the specific manufacturing method includes the following steps: S1. Generate layout path; S2. The first surface of the ceramic disc (zirconia) is processed according to the layout path to form a preliminary denture; there are gaps between the first surfaces of the preliminary denture, the second surfaces of the preliminary denture are connected to each other, and the first surface and the second surface are arranged opposite to each other; the first surface is the root of the denture; the second surface is the tip of the denture. S3. Fill the gaps in the preliminary denture with an adhesive medium (select a microcrystalline wax with a melting point of 130℃, a local tensile stress of 18.5MPa, and an adhesive strength of 4.5MPa, and a kinematic viscosity of 13.8m at 100℃). 2 / s); the filling of the gaps in the preliminary denture with adhesive medium includes: S31. Heat the bonding medium in the medium storage chamber to a first temperature of 170°C and keep it at that temperature for 5 minutes. Open the air valve to control the internal pressure of the medium storage chamber to 0.2 MPa. S32. Perform the first automatic dispensing in the gap of the preliminary denture according to the dispensing path until it is level with the height of the processing surface; S33. After a first interval of 120 seconds, perform a second automatic dispensing in the gap of the preliminary denture according to the dispensing path until the height is level with the processing surface again, and then cool for 10 minutes until the temperature of the ceramic disc is 20°C for curing; the speed of the first automatic dispensing and the second automatic dispensing are both 10 mL / min. S4. Flip the ceramic disc after filling it with bonding medium, perform a second processing on the second surface of the flipped ceramic disc, and cut the bonding medium to form the first denture. S5. Remove the bonding medium from the surface of the denture to obtain a second denture; the bonding medium removed from the surface of the denture includes: S51. The first denture is subjected to a first negative pressure heat treatment for 10 minutes under a pressure of 0.8 MPa, and the temperature T1 of the first negative pressure heat treatment is 175°C. During the first negative pressure heat treatment, the bonding medium melts and flows from the surface of the first denture into the medium recovery tank. S52. The denture placement component containing the first denture enters the cleaning tunnel. Fluid at a pressure of 0.4MPa and a temperature of 180°C is introduced into the cleaning tunnel through the air hole to rinse the adhesive medium remaining on the surface of the first denture. The rinsing time is 30 minutes. S53. The denture placement component containing the first denture is placed in a forced-air drying oven and dried at 120°C for 120 minutes to obtain the second denture with the adhesive medium removed.

[0119] S6. Place the second denture in the sintering unit, first raise the temperature to 1100℃ at 40℃ / min, then raise the temperature to 1600℃ at 1℃ / min, and hold at 1600℃ for 50 minutes to sinter, thereby obtaining the denture product.

[0120] Example B4 This embodiment provides a manufacturing method for cutting dentures without connecting rods. Except for step S33, which omits the "second automatic dispensing of adhesive along the dispensing path in the gap of the initial denture until it is level with the height of the machining surface again", the manufacturing method is the same as that in embodiment B1, and will not be described again here.

[0121] Example B5 This embodiment provides a manufacturing method for cutting dentures without connecting rods. The manufacturing method is the same as that in Embodiment B1 except that the third drying step S53 is omitted and the sintering step S6 is performed directly. It will not be described again here.

[0122] Example B6 This embodiment provides a manufacturing method for cutting dentures without connecting rods. The manufacturing method is the same as that in embodiment B1 except that step S52 is omitted, and will not be described again here.

[0123] Example B7 This embodiment provides a manufacturing method for cutting dentures without connecting rods. Except for the fact that the speed of the first automatic dispensing and the second automatic dispensing are both 30 mL / min, the manufacturing method is the same as that in Embodiment B1, and will not be described again here.

[0124] Example B8 This embodiment provides a manufacturing method for cutting dentures without connecting rods. Except for step S31, in which the air valve is opened and the internal pressure of the medium storage chamber is controlled to be 0.35 MPa, the manufacturing method is the same as that in embodiment B1, and will not be described again here.

[0125] Example B9 This embodiment provides a manufacturing method for cutting dentures without connecting rods. Except for step S31, where the first temperature is 120°C and the holding time needs to be extended by 10 minutes to allow the bonding medium to fully melt, the manufacturing method is the same as that in embodiment B1, and will not be described again here.

[0126] Example B10 This embodiment provides a manufacturing method for cutting dentures without connecting rods. Except for step S51, where the temperature T1 of the first negative pressure heat treatment is 120°C and the time of the first negative pressure heat treatment needs to be extended by 40 minutes to ensure that the bonding medium is fully melted, the manufacturing method is the same as that in embodiment B1, and will not be described again here.

[0127] Example B11 This embodiment provides a manufacturing method for cutting dentures without connecting rods. Except for the fluid temperature of 110°C in step S52, the manufacturing method is the same as that in embodiment B1, and will not be described again here.

[0128] Example B12 This embodiment provides a manufacturing method for cutting dentures without connecting rods. Except for the fluid temperature of 190°C in step S52, the manufacturing method is the same as that in embodiment B1, and will not be described again here.

[0129] Example B13 This embodiment provides a manufacturing method for cutting dentures without connecting rods. The method involves replacing microcrystalline wax with casting wax (model SL162 wax), which has a kinematic viscosity of 3.5 mm at 100°C. 2 Except for / s, everything else is the same as in Example B1, and will not be repeated here.

[0130] Comparative Example DB1 This comparative example provides a manufacturing method for cutting dentures without connecting rods. The manufacturing method is the same as in Example B1, except that the microcrystalline wax is replaced with hot melt adhesive, the brand name is EVA, Delixi, and the local tensile stress of the hot melt adhesive is 31.0 MPa. It will not be described again here.

[0131] Comparative example DB2 This comparative example provides a manufacturing method for cutting dentures without connecting rods. The manufacturing method is the same as in Example B1, except that the microcrystalline wax is replaced with foam adhesive, specifically Oriental Rainbow PU200, and the adhesive strength of the foam adhesive is 0.5 MPa. Therefore, it will not be described again here.

[0132] This comparative example has insufficient adhesion, making it difficult to support the cutting process.

[0133] Comparative example DB3 This comparative example provides a manufacturing method for cutting dentures without connecting rods. The manufacturing method is the same as that in Example B1 except that step S5 is omitted and step S6 is performed directly. It will not be described again here.

[0134] Comparative example DB4 This comparative example provides a manufacturing method for cutting dentures without connecting rods. The manufacturing method is the same as in Example B1 except that step S5 is omitted and step S6 is performed directly, and the heating rate in the first stage of step S6 is adapted to be 5℃ / min. It will not be described again here.

[0135] Comparative example DB5 This comparative example provides a method for processing dentures, which employs traditional processing methods. The specific steps are as follows: (1) The dentures are arranged with connecting rods. In order to facilitate the subsequent removal of the connecting rods, the gap between the dentures is 6mm, which means that the same ceramic disc diameter as in Example 1 can only accommodate 18 dentures.

[0136] (2) The ceramic disc is machined using a machining device; (3) After processing, each denture is manually removed and the root of the denture is ground. (4) Clean the surface of the denture of any remaining connecting rod material; (5) Sinter the dentures.

[0137] This comparative example not only cannot achieve mechanized and automated production, but also has a breakage rate of about 25%. This breakage rate is different from the crack rate. Damaged dentures are difficult to use as denture products, and the production efficiency and material utilization rate are far inferior to those of Example 1. The total time t (min) spent on pre-sintering processing, manual tooth removal, and polishing of the denture root, plus sintering, is 1245 min.

[0138] The method for testing the local tensile stress of the bonding medium in this invention includes: the double-layer beam deflection method: a certain thickness of bonding medium is coated onto an extremely thin substrate (such as a flexible steel sheet or ceramic sheet). As the medium cools and contracts, the entire double-layer structure bends to one side (similar to a deflected cantilever beam). By measuring the radius of curvature R of the beam, the internal stress is calculated using the Stoney formula or its modified version. Where: σ: local average shrinkage stress (MPa) generated by the bonding medium; E s Young's modulus (GPa) of the substrate; t s Substrate thickness (mm); t c : Thickness of the adhesive medium layer (mm); v s Poisson's ratio of the substrate (dimensionless); R: Radius of curvature (mm).

[0139] The standard reference for the test method of adhesive strength of bonding media is GB / T7124; the specific operation includes the following steps: 1. Process the zirconia blank into standard cylindrical blocks (or cubes).

[0140] 2. Apply molten adhesive medium (such as #70 microcrystalline wax) between the two blocks, controlling the adhesive layer thickness (such as 0.1 mm).

[0141] 3. After curing, use a universal testing machine to stretch vertically along the axial direction at a constant speed (e.g., 2 mm / min).

[0142] The standard reference for the test method of kinematic viscosity of adhesive media at 100℃ is GB / T265; the specific operation includes the following steps: Preparation: Place the microcrystalline wax in an oven and heat it to about 110°C until it is completely melted into a clear and transparent liquid. Then filter it through a 100-mesh standard sieve to remove mechanical impurities.

[0143] Sample loading: Immerse the clean and dry capillary viscometer vertically into a constant-temperature oil bath preheated to 100°C. Use a bulb syringe to draw molten wax into the expansion section and capillary of the viscometer, ensuring the liquid level remains between the marks.

[0144] Temperature equilibrium: The sample is kept at a constant temperature in a 100℃ oil bath for at least 20-30 minutes to ensure uniform temperature distribution inside the wax liquid.

[0145] Timing measurement: Turn on the stopwatch and record the time t (seconds) required for the wax liquid to flow through the upper and lower scale lines of the viscometer.

[0146] Repeated measurements: Repeat the measurement at least 4 times, discard data with large errors, and take the average flow time. The reference standard for the test method of the melting point of the bonding medium is GB / T8026; the specific experimental steps include: Sample application: The molten adhesive medium is applied into the metal grease cup and cured under specified cooling conditions.

[0147] Heating: Place the grease cup into the heating mantle of the dropping meter and heat it uniformly at a rate of 1-1.5℃ / min.

[0148] Reading: Record the temperature at which the first drop of liquid wax falls from the bottom orifice of the grease cup and touches the bottom of the test tube; this is the dropping point.

[0149] 1. Assess the crack rate of the denture surface. Machine vision is used to detect the surface of the denture. The crack rate is calculated as the number of dentures with cracks on the zirconia surface divided by the total number of dentures, expressed as a percentage. It should be noted that cracks are not the same as breakage. Cracks do not affect the use of the denture, but they can affect its service life. Cracks, on the other hand, refer to fissures on the denture surface with a length ≤2.0mm and a width ≤0.05mm.

[0150] 2. The carbon residue on the surface of the sintered denture was determined by EDS elemental analysis using scanning electron microscopy to assess the influence of the bonding medium on the composition of the denture.

[0151] 3. Using the methods of the above embodiments and comparative examples, ceramic discs of the same diameter (98mm) were processed (the number of dentures in a single ceramic disc was 21 in the layout path design), and the total time t (min) spent on pre-sintering processing + removal of bonding medium + sintering was calculated.

[0152] It is worth noting that in actual production, sintering is not performed on a single ceramic disc. Multiple ceramic discs can be sintered together. However, in order to evaluate production efficiency, the sintering time of a single ceramic disc is used for statistical analysis in the specific embodiments of this invention.

[0153] The test results of the above embodiments and comparative examples are shown in Table 1.

[0154] Table 1 The following points can be observed from Table 1: (1) As can be seen from the comprehensive examples B1~B3, the manufacturing method of cutting dentures without connecting rods provided by the present invention can achieve a crack rate of less than 10% on the basis of 100% yield, and the carbon residue is 0wt%. The production time required for a single ceramic disc is less than 794min, which is short, has high production efficiency and broad application prospects. (2) It can be seen from the combined examples B1 and B4 that in example B4, the second automatic dispensing is not performed, which leads to local voids and gaps between the zirconia denture and the zirconia wall. During the second surface processing, there is a lack of support, which causes the denture to fall off prematurely due to incomplete processing, or the support is weak, which causes a decrease in the processing accuracy of the denture. Although the crack rate on the surface of the denture is only 5% in the end, the yield of the single ceramic disc is reduced. This shows that the present invention preferably adopts two dispensing steps, which can improve the yield of the single ceramic disc.

[0155] (3) As can be seen from the combined examples B1 and B5, if drying is not performed but the sintering process is used directly, the surface of the denture will be prone to cracks due to the residual moisture on the surface of the denture during the rapid heating process of sintering. The crack rate is 60%. This shows that the present invention preferably dries first and then sinters, which can further improve the product quality of the denture.

[0156] (4) As can be seen from the combined examples B1 and B6, the present invention preferably uses tunnel cleaning in the step of removing the bonding medium, which can further remove the residual zirconium oxide and bonding medium on the surface of the denture, thereby reducing the carbon residue on the surface of the denture after sintering; while in Example B6, white spots appeared on the surface of the denture after sintering, the residual carbon content was high and some zirconium oxide debris was adhered to the surface.

[0157] (5) As can be seen from the combined examples B1, B7 and B8, a faster dispensing speed or higher internal pressure will not have a negative impact on the performance of the denture. However, a larger spraying speed is more difficult to control, and the high-temperature liquid phase bonding medium splashes, resulting in the loss of the bonding medium. After solidification on the surface of the fixture or instrument, it causes wear or damage, affecting subsequent cutting and hindering production.

[0158] (6) As can be seen from the combined examples B1 and B9~B10, the present invention preferably controls the first temperature and the temperature of the first negative pressure heat treatment within a reasonable range of the melting point of the bonding medium, which can further shorten the production time and improve the production efficiency.

[0159] (7) It can be seen from the combined examples B1 and B11~B12 that the present invention preferably controls the temperature of the fluid within a reasonable range, which can not only take into account the low energy consumption, but also improve the removal efficiency of the bonding medium on the denture surface. After sintering, there is no carbon residue in the denture and the crack rate is lower. In contrast, in example B11, not only is the crack rate higher than that in example B1, but the bonding medium adheres to the surface of the denture and is easily sintered directly, which can lead to carbon residue.

[0160] (8) As can be seen from the combined examples B1 and B13, the present invention preferably controls the kinematic viscosity of the bonding medium within a reasonable range, which can reduce carbon residue in the denture and reduce the crack rate.

[0161] (9) In comparative example DB1, the use of hot melt adhesive easily leads to cracks on the surface of the denture, resulting in a high crack rate; in comparative example DB2, the use of foam adhesive results in weak bonding strength and difficulty in supporting the cutting process; in comparative example DB3, the bonding medium is not removed in advance and sintering is carried out directly, resulting in high surface carbon content and a significant increase in crack rate; in comparative example DB4, the bonding medium is not removed and the heating rate during sintering is appropriately reduced. Although the crack rate can be reduced compared to comparative example DB3, the surface carbon residue is still high and the production efficiency will decrease.

[0162] The present invention has been illustrated with the above embodiments to illustrate its detailed features, but the present invention is not limited to the above detailed features, that is, it does not mean that the present invention must rely on the above detailed features to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions for the selected technical features, additions of auxiliary technical features, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A method for manufacturing a cut denture without connecting rods, characterized in that, The manufacturing method includes: performing connecting rodless cutting on a ceramic disc, wherein a bonding medium is used to bond the denture during the connecting rodless cutting; The local tensile stress of the adhesive medium is ≤30MPa, and the adhesive force of the adhesive medium is ≥1MPa.

2. The manufacturing method according to claim 1, characterized in that, The kinematic viscosity of the adhesive medium at 100°C is 10~15 mm. 2 / s; Preferably, the melting point of the bonding medium is 70~130℃; Preferably, the bonding medium is microcrystalline wax.

3. The manufacturing method according to claim 1 or 2, characterized in that, The manufacturing method includes the following steps: A ceramic disc is subjected to rodless cutting, in which a bonding medium is used to bond the denture, resulting in a first denture with a bonding medium. The bonding medium on the surface of the denture is removed to obtain a second denture; The second denture is sintered to obtain the denture product.

4. The manufacturing method according to claim 3, characterized in that, The adhesive medium for removing the denture surface includes: the first denture undergoing a first negative pressure heat treatment, a second fluid cleaning, and a third drying in sequence; Preferably, the pressure of the first negative pressure heat treatment is 0.3~0.8 MPa; Preferably, the temperature T1 of the first negative pressure heat treatment is greater than the melting point T2 of the bonding medium; Preferably, the temperature T1 of the first negative pressure heat treatment and the melting point T2 of the bonding medium satisfy T1-T2≥30℃; Preferably, the duration of the first negative pressure heat treatment is 10-60 minutes; Preferably, during the first negative pressure heat treatment, the bonding medium melts and flows from the surface of the first denture into the medium recovery tank; Preferably, the second fluid cleaning includes: a denture placement component containing the first denture entering a cleaning tunnel, and fluid being introduced into the cleaning tunnel through an air hole to rinse the adhesive medium remaining on the surface of the first denture; Preferably, the temperature of the second fluid cleaning is 120~180℃; Preferably, the second fluid cleaning time is 30-60 minutes; Preferably, the pressure of the second fluid cleaning is 0.3~0.4 MPa; Preferably, the fluid used in the second fluid cleaning includes any one or a combination of at least two of air, steam, or a dewaxing agent; Preferably, the dewaxing agent comprises n-hexane and / or n-heptane; Preferably, the temperature of the third drying step is 120~180℃; Preferably, the third drying time is 60-120 minutes; Preferably, the sintering includes a first heating stage, a second heating stage, and a holding stage; Preferably, the heating rate in the first heating stage is 40~60℃ / min; Preferably, the final temperature of the first heating stage is 1000~1100℃; Preferably, the heating rate in the second heating stage is 1~10℃ / min; Preferably, the final temperature of the second heating stage is 1500~1600℃; Preferably, the heat preservation stage lasts for 50 to 70 minutes.

5. The manufacturing method according to claim 3 or 4, characterized in that, The process of cutting the ceramic disk without connecting rods includes: The first surface of the ceramic disc is processed according to the layout path to form a preliminary denture; there are gaps between the first surfaces of the preliminary denture, the second surfaces of the preliminary denture are connected to each other, and the first and second surfaces are arranged opposite to each other; Fill the gaps in the preliminary denture with bonding medium; The ceramic disc, after being filled with bonding medium, is flipped over, and the second side of the flipped ceramic disc is processed a second time to form the first denture.

6. The manufacturing method according to claim 5, characterized in that, The spacing between adjacent dentures in the layout path is 3~5mm; Preferably, the first surface is the root of the denture; Preferably, the second surface is the cusp of a denture tooth; Preferably, filling the gaps in the preliminary denture with an adhesive medium includes: The bonding medium in the medium storage chamber is heated to a first temperature and kept at a first temperature. The gas valve is opened to control the internal pressure of the medium storage chamber. The first automatic dispensing is performed in the gap of the preliminary denture according to the dispensing path until it is level with the height of the processed surface; After the first interval, a second automatic dispensing is performed in the gap of the preliminary denture according to the dispensing path until it is level with the height of the processed surface again, and then cured. Preferably, the first temperature T3 is greater than the melting point T2 of the bonding medium; Preferably, the first temperature T3 and the melting point T2 of the bonding medium satisfy T3-T2≥30℃; Preferably, the duration of the first heat preservation is 5-10 minutes; Preferably, the internal pressure is 0.1~0.2 MPa; Preferably, the speeds of the first automatic dispensing and the second automatic dispensing are each independently 10~25 mL / min; Preferably, the first duration is 40~120s; Preferably, the curing method includes cooling; Preferably, the cooling time is 5-10 minutes; Preferably, the temperature of the cooled ceramic disc is ≤35℃.

7. A manufacturing apparatus for cutting dentures without connecting rods, characterized in that, The manufacturing apparatus includes: A rodless cutting unit is used for bonding and fixing dentures together using an adhesive medium; The media removal unit is used to remove the bonding media from the surface of the denture; Sintering unit, used for sintering dentures.

8. The manufacturing apparatus according to claim 7, characterized in that, The media removal unit includes a denture placement component, and sequentially includes a first media removal section, a second media removal section, and a third drying section along the denture processing steps. The denture placement component sequentially passes through the first media removal section, the second media removal section, and the third drying section to perform the first media removal, the second media removal, and the third drying. Preferably, the denture placement component includes a denture tray and a media collection section disposed at the lower part of the denture tray, and the bottom of the denture tray has a mesh structure; Preferably, the media recovery unit includes a media recovery tank; Preferably, the first medium removal section includes a drying oven; Preferably, the second medium removal section includes a cleaning tunnel, which has a plurality of air holes for the passage of cleaning fluid; Preferably, the second medium removal section further includes a cleaning fluid conveying device connected to the cleaning tunnel; Preferably, the third drying section includes a forced-air drying oven.

9. The manufacturing apparatus according to claim 7 or 8, characterized in that, The connecting rodless cutting unit includes: The processing unit includes at least one processing module, which performs a first processing on a first surface of a ceramic disc according to a layout path to form a preliminary denture; the first surfaces of the preliminary denture have gaps between them, and the second surfaces of the preliminary denture are connected to each other, with the first and second surfaces arranged opposite to each other; The adhesive application section is used to fill the gaps in the preliminary denture with adhesive medium; The flipping section is used to flip the ceramic disc after the adhesive coating section has been filled with the bonding medium. The processing unit is also used to perform a second processing on the second surface of the flipped ceramic disc to form a first denture; The control system is used to control the processing operations of the machining section, the gluing section, and the flipping section according to the process.

10. The manufacturing apparatus according to claim 9, characterized in that, The adhesive coating section includes a medium storage chamber and a medium delivery pipe connected to the medium storage chamber. The medium storage chamber is equipped with a gas valve for controlling the pressure inside the medium storage chamber. Preferably, the adhesive coating section further includes a heat insulation section disposed outside the medium storage cavity; Preferably, the adhesive coating section further includes a temperature control device disposed on the insulation section; Preferably, the control system includes an adhesive application program, which controls the air valve to perform the adhesive application process. Preferably, the adhesive application process includes at least two adhesive application steps; Preferably, the adhesive application process includes a first adhesive application process and a second adhesive application process.

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