A production process for metal porcelain teeth

Abstract

The present invention relates to A61C13, and more specifically, the present invention relates to a metal porcelain tooth production process. The process comprises the following steps: (1) pretreatment; (2) infusion; and (3) cutting. The pretreatment includes model disinfection, model inspection, model repair, casting insertion, and wax embedding. The metal porcelain tooth provided by the present invention has good bonding strength and is not easy to break. By controlling the preheating, firing temperature, and firing time, the synergistic effect is beneficial to improving the resistance of the metal porcelain tooth to rapid heating and cooling. The metal porcelain tooth has a realistic shape, high oral comfort, and is not likely to cause a foreign body sensation. The obtained metal porcelain tooth has good stability and can maintain its own color for a long time. It will not turn yellow after being placed in the air at a humidity of 50% for 6 months.

Description

Technical Field

[0001] The present invention relates to A61C13, and more particularly to a production process of metal porcelain teeth. Background Art

[0002] Many people suffer from oral diseases in today's society, and dental problems are the most common of these. Damage to teeth can affect chewing function, causing problems with daily eating. Dentures are a good solution to these problems, as they can help alleviate symptoms.

[0003] Although dentures can improve chewing efficiency, they also bring some other problems. When installed in the mouth, they are not easy to clean, which will lead to the growth of bacteria and reduce their service life. At the same time, dentures will also cause a certain degree of discomfort to the body and make people feel the presence of foreign objects.

[0004] Patent No. CN108210101B provides a denture bracket manufacturing process, which increases the success rate of subsequent casting by controlling the increase rate of the firing temperature during the firing process. Summary of the Invention

[0005] In order to solve the above problems, the first aspect of the present invention provides a metal porcelain tooth production process, which includes the following steps: (1) pretreatment; (2) perfusion; and (3) cutting.

[0006] As a preferred technical solution of the present invention, the pretreatment includes model disinfection, model inspection, model repair, casting insertion, and wax-up embedding.

[0007] The patient bites the plaster in his or her mouth, leaving a tooth impression and obtaining a model.

[0008] The preparation method of gypsum is as follows: 25g of distilled water and 75g of gypsum powder are mixed and stirred for 9 minutes to obtain gypsum.

[0009] When checking the model, ensure that the model used is free of bubbles and has a clear shape.

[0010] As a preferred technical solution of the present invention, the model repairing step includes controlling the neck edge to extend to 0.2mm-0.5mm.

[0011] Dental crowns are divided into clinical crowns and anatomical crowns. The clinical crown refers to the part exposed to the mouth, and its dividing line is the gingival margin; the anatomical crown refers to the part covered by enamel, and its dividing line is the tooth neck, that is, the cervical margin.

[0012] As a preferred technical solution of the present invention, the sprue is inserted by inserting the porcelain wax-up model into the casting crown, the thickness of the porcelain wax-up model is 0.4mm-0.5mm, and the thickness of the casting crown is 0.8mm-1mm.

[0013] Preferably, the cast crown is selected from one of a gold alloy cast crown, a nickel-chromium alloy cast crown, and a cobalt-chromium alloy cast crown.

[0014] A cast crown includes a casting cavity.

[0015] As a preferred technical solution of the present invention, the embedding of the wax model includes: after stirring the phosphohydrochloric acid embedding material under vacuum conditions, embedding the porcelain wax model to obtain a casting, which is located at 3 / 10-5 / 10 of the upper end of the casting cavity length of the casting crown.

[0016] As a preferred technical solution of the present invention, the pouring includes roasting and casting.

[0017] Preferably, the baking furnace is preheated to 150-200° C., the cast crown containing the casting is placed therein, and baked.

[0018] The cast crown is a part of the denture, which plays the role of fixing and supporting the denture body. Together with the denture body, it is inlaid in the missing part of the mouth.

[0019] After extensive experimentation, the applicant has determined that preheating the furnace before firing not only improves the glossiness of the metal-ceramic crown but also facilitates the production of metal-ceramic crowns with superior resistance to rapid heating and cooling. The applicant speculates that this may be due to the fact that preheating the furnace can, to a certain extent, remove some impurities from the furnace, allowing these chemicals to decompose prematurely without negatively impacting the firing of the cast crown. Furthermore, the coordinated firing temperature and firing time ensure that the cast crown is fully bonded and solidified during firing, facilitating the formation of a dense oxide film on its surface. This makes the cast crown more stable and provides a seamless connection to the denture body without generating bubbles.

[0020] As a preferred technical solution of the present invention, the temperature during the calcination is 0°C-900°C, and the calcination time is 0.9-1.8h.

[0021] As a preferred technical solution of the present invention, the roasting further includes heat preservation, and the heat preservation time is 20-45 minutes.

[0022] The alloy is melted and poured into the casting cavity, cooled, and the cooling rate is controlled at 5-8°C / s, and cooled to room temperature to obtain the denture.

[0023] Preferably, the alloy is selected from nickel-chromium alloy, cobalt-chromium alloy, and pure titanium alloy.

[0024] The denture is ground and polished to a thickness of 0.3mm-0.4mm and the thickness of the denture casting crown is 0.5mm-0.8mm.

[0025] Porcelain powder is piled up on the denture to create the shape of the denture and then sintered in a porcelain furnace to form metal porcelain teeth. The thickness of the magnetic powder is 1.0mm-1.2mm, and the thickness of the alloy is 0.3mm-0.5mm.

[0026] As a preferred technical solution of the present invention, the metal porcelain tooth production process also includes inspection.

[0027] The alloy surface of metal porcelain teeth is smooth, without scratches, gaps and burrs, which means they pass the inspection.

[0028] A second aspect of the present invention provides an application of a metal porcelain tooth production process, wherein the metal porcelain tooth process is applied in the field of medical devices.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The metal porcelain tooth provided by the present invention has good bonding strength and is not easy to break.

[0031] (2) It provides high oral comfort and is not likely to cause a foreign body sensation.

[0032] (3) By controlling the preheating, firing temperature and firing time, the synergistic effect is beneficial to improving the resistance of metal porcelain teeth to rapid heating and cooling.

[0033] (4) The metal porcelain teeth provided by the present invention have realistic shapes and high aesthetics.

[0034] (5) The obtained metal porcelain teeth have good stability and can maintain their own color for a long time. They will not turn yellow after being placed in the air under 50% humidity for 6 months. DETAILED DESCRIPTION

[0035] Example

[0036] The raw materials for preparing the compositions in the embodiments are all commercially available, wherein gypsum powder was purchased from Guangzhou Gypsum Products Factory in Guangzhou, model is superhard gypsum, porcelain wax type was purchased from Yikeshu, model is T1, cast crown was purchased from Qingdao Jinborui Dental Technology Co., Ltd., which is a cobalt-chromium alloy cast crown, phosphate embedding material was purchased from Feima Casting Powder Factory in Qingyunpu District, Nanchang City, model is LS-25, cobalt-chromium alloy was purchased from Suzhou Rongqian Rare Metal Products Co., Ltd., brand is Co99.98, porcelain powder was purchased from Hangzhou Hengge Nano Technology Co., Ltd., model is HN-R50K.

[0037] Example 1

[0038] This example provides a metal porcelain tooth production process, which includes the following steps: (1) pretreatment; (2) pouring; (3) cutting.

[0039] The pretreatment includes model disinfection, model inspection, model repair, casting, and wax-up embedding.

[0040] The patient bites the plaster in his or her mouth, leaving a tooth impression and obtaining a model.

[0041] The preparation method of gypsum is as follows: 25g of distilled water and 75g of gypsum powder are mixed and stirred for 9 minutes to obtain gypsum.

[0042] When checking the model, ensure that the model used is free of bubbles and has a clear shape.

[0043] The model restoration step includes controlling the neck edge extension to 0.3 mm.

[0044] The sprue is inserted into the cast crown. The thickness of the wax-up model is 0.4 mm, and the thickness of the cast crown is 0.8 mm.

[0045] The embedding of the wax pattern includes: after stirring the phosphohydrochloric acid embedding material under vacuum conditions, embedding the porcelain wax pattern to obtain a casting, which is located at 2 / 5 of the upper end of the casting cavity length of the casting crown.

[0046] The pouring includes roasting and casting.

[0047] Preheat the furnace to 185°C, place the crown containing the casting, and bake it at 730°C for 1.5 hours. Hold at this temperature for 30 minutes.

[0048] The cobalt-chromium alloy was melted and injected into the casting cavity, cooled, and the cooling rate was controlled at 6°C / s until it cooled to room temperature to obtain the denture.

[0049] The dentures were ground and polished to a thickness of 0.3 mm and the denture crowns were 0.5 mm thick.

[0050] Porcelain powder is piled up on the denture to create the shape of the denture and then sintered in a porcelain furnace to form a metal porcelain tooth. The thickness of the magnetic powder is 1mm, and the thickness of the alloy is 0.4mm.

[0051] The metal porcelain teeth production process also includes inspection.

[0052] The alloy surface of metal porcelain teeth is smooth, without scratches, gaps and burrs, which means they pass the inspection.

[0053] Example 2

[0054] This example provides a process for producing metal porcelain teeth. Unlike Example 1, the firing furnace is preheated to 170°C, the cast crown containing the casting is placed in the furnace, and the firing is performed at a temperature of 800°C for 1.7 hours and a holding time of 25 minutes.

[0055] Example 3

[0056] This example provides a process for producing metal porcelain fused to metal teeth. Unlike Example 1, this example preheats the furnace to 170°C, places the cast crown containing the casting, and then fires it. The firing temperature is 800°C for 1.7 hours, followed by a 25-minute hold. A molten cobalt-chromium alloy is then injected into the casting cavity and cooled at a controlled cooling rate of 8°C / s.

[0057] Example 4

[0058] This example provides a process for producing metal porcelain teeth. Unlike Example 1, the firing furnace is preheated to 100°C, the cast crown containing the casting is placed in the furnace, and the firing is performed at a temperature of 900°C for 1.5 hours and a holding time of 25 minutes.

[0059] Example 5

[0060] This example provides a process for producing metal porcelain teeth. Unlike Example 1, the firing furnace is preheated to 190°C, the cast crown containing the casting is placed in the furnace, and then fired. The firing temperature is 850°C for 1.3 hours, followed by a 30-minute hold. A molten cobalt-chromium alloy is then injected into the casting cavity and cooled at a controlled cooling rate of 10°C / s.

[0061] Performance testing:

[0062] 1. Appearance test: The appearance of the metal porcelain teeth obtained in Examples 1-5 was observed. The results are shown in Table 1:

[0063] Table 1

[0064]

[0065]

[0066] 2. Rapid cooling and heating resistance test: The metal porcelain teeth obtained in Examples 1-5 were subjected to rapid cooling and heating resistance tests according to YY 0300-2009. The results are shown in Table 2:

[0067] Table 2

[0068] Example Resistance to rapid cooling and heating 1 Resistant to sudden cold and heat 2 Resistant to sudden cold and heat 3 Resistant to sudden cold and heat 4 Intolerant of rapid cold and heat 5 Resistant to sudden cold and heat

[0069] 3. Porosity test: The porosity test of the metal porcelain teeth obtained in Examples 1-5 was performed according to YY 0300-2009. The results are shown in Table 3:

[0070] Table 3

[0071]

[0072] 4. Metal-porcelain bonding strength test: The metal-porcelain bonding strength test was performed on the metal-porcelain teeth obtained in Examples 1-5 according to YY 0621.1-2016. The results are shown in Table 4:

[0073] Table 4

[0074] Example Metal-ceramic bonding strength (MPa) 1 30 2 29 3 32 4 23 5 24

[0075] 5. Color stability: The metal porcelain teeth obtained in Examples 1-5 were placed in air at a humidity of 50% for 6 months, and the surface color was observed. The results are shown in Table 5:

[0076] Table 5

[0077] Example color 1 Glossy, no yellowing 2 Glossy, no yellowing 3 Glossy, no yellowing 4 Poor gloss, yellowing 5 Poor gloss, yellowing

[0078] It can be seen that the metal porcelain teeth obtained in Examples 1-3 have a smooth, shiny surface, no cracks, no bubbles, are resistant to rapid cooling and heating, have good porosity and metal-porcelain bonding strength, and good color stability. They are shiny and do not turn yellow after being placed in air at a humidity of 50% for 6 months.

Claims

1. A metal porcelain tooth production process, characterized in that, The following steps are involved: (1) Pretreatment; (2) Infusion; (3) Cutting; The pretreatment includes model disinfection, model inspection, model repair, casting, and wax-up embedding; The step of repairing the model includes extending the neck edge to 0.2mm-0.5mm; The sprue is inserted by inserting the porcelain wax model into the casting crown, the thickness of the porcelain wax model is 0.4mm-0.5mm, and the thickness of the casting crown is 0.8mm-1mm; The embedding of the wax pattern comprises: after stirring the phosphohydrochloric acid embedding material under vacuum conditions, embedding the wax, and the casting is located at 3 / 10-5 / 10 of the upper end of the casting cavity length; The pouring comprises preheating a baking furnace to 170-185° C., placing the cast crown containing the casting, and baking; The calcination temperature is 730-800°C and the calcination time is 0.9-1.8h; The roasting also includes heat preservation, and the heat preservation time is 20-45 minutes.

2. The metal porcelain tooth production process according to claim 1, characterized in that: The metal porcelain tooth production process also includes inspection.

3. An application of the metal porcelain tooth production process according to claim 1, characterized in that: The metal porcelain tooth process is applied in the field of medical devices.

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