CN112830779B - Colored transparent zirconia ceramic bracket and powder injection molding process thereof - Google Patents
Colored transparent zirconia ceramic bracket and powder injection molding process thereof Download PDFInfo
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- CN112830779B CN112830779B CN202110299420.4A CN202110299420A CN112830779B CN 112830779 B CN112830779 B CN 112830779B CN 202110299420 A CN202110299420 A CN 202110299420A CN 112830779 B CN112830779 B CN 112830779B
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- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 239000000919 ceramic Substances 0.000 title claims abstract description 67
- 239000000843 powder Substances 0.000 title claims abstract description 63
- 238000001746 injection moulding Methods 0.000 title claims abstract description 22
- 239000011230 binding agent Substances 0.000 claims abstract description 24
- 239000011812 mixed powder Substances 0.000 claims abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 38
- 238000004043 dyeing Methods 0.000 claims description 37
- 235000015895 biscuits Nutrition 0.000 claims description 23
- 239000003086 colorant Substances 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 21
- 239000000741 silica gel Substances 0.000 claims description 20
- 229910002027 silica gel Inorganic materials 0.000 claims description 20
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 18
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims description 18
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 18
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 claims description 18
- 239000004743 Polypropylene Substances 0.000 claims description 10
- 235000021355 Stearic acid Nutrition 0.000 claims description 10
- 229920001903 high density polyethylene Polymers 0.000 claims description 10
- 239000004700 high-density polyethylene Substances 0.000 claims description 10
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 10
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 10
- 239000012188 paraffin wax Substances 0.000 claims description 10
- -1 polypropylene Polymers 0.000 claims description 10
- 229920001155 polypropylene Polymers 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 239000008117 stearic acid Substances 0.000 claims description 10
- 229910000416 bismuth oxide Inorganic materials 0.000 claims description 9
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical group [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 9
- 239000000292 calcium oxide Substances 0.000 claims description 9
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 9
- 239000000395 magnesium oxide Substances 0.000 claims description 9
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 9
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 9
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 8
- 235000012239 silicon dioxide Nutrition 0.000 claims description 8
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- YWECOPREQNXXBZ-UHFFFAOYSA-N praseodymium(3+);trinitrate Chemical compound [Pr+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O YWECOPREQNXXBZ-UHFFFAOYSA-N 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- YBYGDBANBWOYIF-UHFFFAOYSA-N erbium(3+);trinitrate Chemical compound [Er+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O YBYGDBANBWOYIF-UHFFFAOYSA-N 0.000 claims description 6
- 238000004040 coloring Methods 0.000 claims description 5
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000009776 industrial production Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 230000002265 prevention Effects 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000010794 food waste Substances 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 2
- 210000000214 mouth Anatomy 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical group [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009694 cold isostatic pressing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
- C04B35/486—Fine ceramics
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/12—Brackets; Arch wires; Combinations thereof; Accessories therefor
- A61C7/14—Brackets; Fixing brackets to teeth
- A61C7/16—Brackets; Fixing brackets to teeth specially adapted to be cemented to teeth
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- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/24—Producing shaped prefabricated articles from the material by injection moulding
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- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
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- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
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- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to a colored transparent zirconia ceramic bracket which comprises 82-86 parts by weight of mixed powder formed by ceramic powder and 14-18 parts by weight of a binder. The invention also relates to a powder injection molding process of the colored transparent zirconia ceramic bracket. The ceramic bracket has higher biocompatibility with human teeth, easier tooth color matching, high degree of automation production and convenient operation, and enables large-scale industrial production to be possible.
Description
[ field of technology ]
The invention relates to the technical field of tooth orthodontics, in particular to a colored transparent zirconia ceramic bracket and a powder injection molding process thereof.
[ background Art ]
Brackets are a device that must be used in orthodontic techniques. The structure is compact and diversified, and the preparation method is complex. For example, chinese patent CN 1701764A discloses a "transparent alumina bracket and a method for preparing the same", wherein the bracket is prepared from high purity alumina with a content of 99% or more, and although the transparency is good, the method of dry pressing and cold isostatic pressing is not suitable for industrial mass production. CN 103263302B discloses a "preparation method of highly transparent ceramic bracket for orthodontic treatment", the ceramic bracket is yttrium aluminum garnet and magnesium aluminum spinel ceramic bracket, not only the cost of raw materials is high, but also sintering under vacuum or nitrogen atmosphere and up to 1900 ℃ is required, and the clinical applicability is not great. CN 105130431A discloses a "personalized color zirconia dental bracket and a preparation method thereof", wherein the mole percent of yttria added as a stabilizer is too high, so that the prepared ceramic bracket has insufficient toughness, is easy to break in use, and is particularly unsuitable for industrial mass production due to the fact that the ceramic bracket is molded by a dry pressing method.
Thus, the prior art has yet to be developed.
[ invention ]
In view of the above, the present invention provides a colored transparent zirconia ceramic bracket and a powder injection molding process thereof, which aims to solve various defects existing in the zirconia ceramic bracket preparation method in the prior art.
In order to achieve the above object, the embodiments of the present invention provide a colored transparent zirconia ceramic bracket.
The bracket comprises the following raw materials, namely 82-86 parts by weight of ceramic powder and 14-18 parts by weight of binder.
Preferably, the ceramic powder comprises high-purity nano zirconia powder, yttrium oxide powder with the content of less than 5 mol%, alkaline earth metal oxide with the content of less than or equal to 5 mol%, trivalent element oxide with the content of 0.2-10 mol% and silicon dioxide with the content of 6-17 mol%.
Preferably, the binder comprises paraffin wax, high density polyethylene, polypropylene and stearic acid, the alkaline earth metal oxide is selected from calcium oxide, barium oxide, magnesium oxide or/and strontium oxide, and the trivalent element oxide is selected from aluminum oxide, lanthanum oxide or/and bismuth oxide.
In order to achieve the above object, the embodiment of the invention provides a powder injection molding process of a colored transparent zirconia ceramic bracket, comprising the following steps:
(1) Mixing ceramic powder and binder into mixed powder by an internal mixer;
(2) Injecting the mixed powder in the step (1) into a bracket biscuit through a die on a high-speed injection molding machine, and demolding for later use;
(3) Raising the temperature of the biscuit obtained in the step (2) to 800-1000 ℃ in a dryer at a speed of 15-50 ℃ per hour, and preserving heat for 1-2 hours;
(4) Immersing the biscuit obtained in the step (3) into a dyeing liquid for dyeing for 15 seconds, sucking off excessive dyeing liquid, and drying in a dryer with the temperature of 100 ℃;
(5) And (3) raising the temperature of the bracket in the step (4) to 1400-1500 ℃ in a dryer at a speed of raising the temperature by 300 ℃ per hour, preserving the heat for 2-3 hours, and naturally cooling to room temperature to form the colored transparent zirconia ceramic bracket.
Preferably, the dyeing liquid comprises the following raw materials in parts by weight:
100 parts of deionized water, 0.4-46 parts of erbium nitrate colorant, 0.06-2.4 parts of praseodymium nitrate colorant and 0.04-3.66 parts of ferric chloride colorant.
Preferably, the dyeing color value of the dyeing in the step (4) is A1-A5, B1-B5 and C1-C5 of a VITA clinical colorimetric plate.
Preferably, the weight part of the ceramic powder in the mixed powder is 82-86 parts, and the weight part of the binder is 14-18 parts.
Preferably, the ceramic powder comprises high-purity nano zirconia powder, yttrium oxide powder with the content of less than 5 mol%, alkaline earth metal oxide with the content of less than or equal to 5 mol%, trivalent element oxide with the content of 0.2-10 mol% and silicon dioxide with the content of 6-17 mol%.
Preferably, the binder comprises paraffin wax, high density polyethylene, polypropylene and stearic acid, the alkaline earth metal oxide is selected from calcium oxide, barium oxide, magnesium oxide or/and strontium oxide, and the trivalent element oxide is selected from aluminum oxide, lanthanum oxide or/and bismuth oxide.
The beneficial effects of the invention are as follows:
1, compared with the alumina ceramic bracket, the colored transparent zirconia ceramic bracket prepared by the invention has higher biocompatibility with human teeth and easier tooth color matching.
2, the invention adopts the ceramic powder injection molding production process, has high degree of automation and convenient operation, and enables large-scale industrial production to be possible.
The fixing protection of the device to the arch wire is completed through the bottom plate, the groove, the ligature wing groove, the first clamping groove, the fixing hole, the fixing mechanism, the bolt, the leaf spring, the elastic limiting piece, the arch wire and the second clamping groove, the bolt is inserted into the inner side of the fixing hole, the leaf spring is clamped into the inner side of the first clamping groove, the bottom end and the front end of the elastic limiting piece are respectively clamped into the inner side of the groove and the inner side of the second clamping groove, the longitudinal traction protection is provided for the fixing mechanism, the transverse traction protection is reinforced, and the accidental falling of the arch wire in the using process is avoided, so that the tooth correction treatment progress of a wearer is influenced.
According to the invention, the cleaning of the device is convenient and fast through the bottom plate, the groove, the ligature wing groove, the front groove wing, the rear groove wing, the first clamping groove, the fixing hole, the fixing mechanism, the front silica gel cover piece, the rear silica gel cover piece and the second clamping groove, and the first clamping groove, the second clamping groove and the groove are completely filled through the front silica gel cover piece and the rear silica gel cover piece, so that food residues are prevented from being accumulated on the inner sides of the first clamping groove, the second clamping groove and the groove, the cleaning of the device is inconvenient, and the oral health of a wearer is influenced.
Drawings
FIG. 1 is a perspective view of the structure of the present invention;
FIG. 2 is a front view of the structure of the present invention;
FIG. 3 is a right side view of the structure of the present invention;
FIG. 4 is a right cross-sectional view of the structure of the present invention;
fig. 5 is a perspective view showing the structure of the fixing mechanism of the present invention.
In the figure: 1 bottom plate, 2 slot, 3 ligature wing ditch, 4 preceding slot wing, 5 back slot wing, 6 first draw-in groove, 7 fixed orifices, 8 fixed establishment, 81 bolt, 82 springs, 83 elasticity spacing piece, 84 preceding silica gel cover piece, 85 back silica gel cover piece, 86 archwire, 9 second draw-in groove.
[ detailed description ] of the invention
In order that the invention may be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated below. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," "upper," "lower," "inner," "outer," "bottom," and the like as used in this specification are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items. The technical features of the different embodiments of the invention may be combined with each other as long as they do not collide with each other.
The colored transparent zirconia ceramic bracket comprises 82-86 parts by weight of mixed powder formed by ceramic powder and 14-18 parts by weight of binder. The colored transparent zirconia ceramic bracket for orthodontic treatment comprises a base plate, and groove wings, groove grooves and ligature wing grooves which are arranged on the base plate, wherein the transmittance of the bracket in the visible light range is more than 35% when the thickness of the bracket is 1 mm.
The ceramic powder comprises high-purity nano zirconia powder and yttrium oxide powder with the content of less than 5 mol%. The ceramic powder comprises high-purity nano zirconia powder, yttrium oxide powder with the content of less than 5 mol%, alkaline earth metal oxide with the content of less than or equal to 5 mol%, trivalent element oxide with the content of 0.2-10 mol% and silicon dioxide with the content of 6-17 mol%.
The binder comprises paraffin wax, high-density polyethylene, polypropylene and stearic acid, wherein the alkaline earth metal oxide is selected from calcium oxide, barium oxide, magnesium oxide or/and strontium oxide, and the trivalent element oxide is selected from aluminum oxide, lanthanum oxide or/and bismuth oxide.
Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides a pottery auto-lock holds in palm groove, includes bottom plate 1, and groove 2 has been seted up at the top surface middle part of bottom plate 1, and ligature wing ditch 3 has been seted up in the outside of bottom plate 1, and groove wing 4 and back groove wing 5 before the top front side of bottom plate 1 and the rear side fixedly connected with respectively, and first draw-in groove 6 has been seted up at the top of preceding groove wing 4, and fixed orifices 7 have been seted up at the top of preceding groove wing 4, and fixed establishment 8 has been pegged graft to the inboard of fixed orifices 7, and second draw-in groove 9 has been seted up at the top of back groove wing 5.
The fixing mechanism 8 comprises a bolt 81, the bottom end of the bolt 81 is inserted into the inner side of the fixing hole 7, the top end of the bolt 81 is provided with a rotary groove, the inner side of the rotary groove is movably connected with the front side of the top end of an elastic limit piece 83, the top end of the bolt 81 is fixedly connected with two leaf springs 82, the bottom ends of the two leaf springs 82 are respectively and fixedly connected with the left side and the right side of the top end of the bolt 81, the outer sides of the top ends of the two leaf springs 82 are respectively and fixedly connected with the inner side of the first clamping groove 6, the top end of the bolt 81 is movably connected with an elastic limit piece 83, the top end of the elastic limit piece 83 is connected with the inner side of a second clamping groove 9, the bottom end of the elastic limit piece 83 is connected with the inner side of a groove 2, the front side of the top end of the elastic limit piece 83 is fixedly connected with a rotary ball, the front side and the rear side of the top end of the elastic limit piece 83 are respectively fixedly connected with a front silica gel cover piece 84 and a rear silica gel cover piece 85, the front bottom end of the front silica gel cover piece 84 is propped against the top end of the leaf spring 82, the outer side of the front silica gel cover piece 84 and the outer side of the rear silica gel cover piece 85 are respectively clamped on the inner side of the first clamping groove 6 and the inner side of the second clamping groove 9, the bottom end of the elastic limiting piece 83 is propped against the arch wire 86, the outer side of the arch wire 86 is wound on the outer side of the ligature wing groove 3, the outer side of the arch wire 86 is sleeved on the inner side of the groove 2, longitudinal traction prevention protection and transverse traction reinforcement prevention protection are provided for the fixing mechanism 8 through the bolt 81, the leaf spring 82 and the elastic limiting piece 83, longitudinal traction prevention protection and transverse traction reinforcement prevention protection are provided for the fixing mechanism 8, accidental falling of the arch wire 86 in the using process is avoided, the dental correction treatment progress of a wearer is influenced, the first clamping groove 6, the second clamping groove 9 and the groove 2 are completely filled through the front silica gel cover piece 84 and the rear silica gel cover piece 85, preventing food waste from being accumulated inside the first clamping groove 6, the second clamping groove 9 and the groove 2, resulting in inconvenient cleaning of the device and affecting oral health of a wearer.
Working principle:
when the ceramic self-locking bracket is used, the bottom plate 1 of the device is adhered to the outer side of a dental crown to be worn through an adhesive, the archwire 86 is sleeved at the slot 2 and wound on the outer side of the ligature wing slot 3 to fix the archwire 86, the plug pin 81 is inserted into the inner side of the fixing hole 7, the leaf spring 82 is clamped on the inner side of the first clamping slot 6, the fixing mechanism 8 is provided with a transverse traction prevention protection, the bottom end and the front end front side of the elastic limiting piece 83 are respectively clamped on the inner side of the slot 2 and the inner side of the second clamping slot 9, the fixing mechanism 8 is provided with a longitudinal traction prevention protection and a reinforced transverse traction prevention protection, accidental falling of the archwire 86 in the use process is avoided, the dental correction treatment progress of a wearer is influenced, and at the moment, the front silica gel cover piece 84 and the rear silica gel cover piece 85 completely fill the first clamping slot 6, the second clamping slot 9 and the slot 2, food residues are prevented from being accumulated on the inner sides of the first clamping slot 6, the second clamping slot 9 and the slot 2, and the oral cavity of the device is prevented from being cleaned conveniently, and the oral cavity health of the device is not influenced for a wearer.
The embodiment of the invention provides a powder injection molding process for a colored transparent zirconia ceramic bracket, which comprises the following steps:
(1) Mixing ceramic powder and binder into mixed powder by an internal mixer;
(2) Injecting the mixed powder in the step (1) into a bracket biscuit through a die on a high-speed injection molding machine, and demolding for later use;
(3) Raising the temperature of the biscuit obtained in the step (2) to 800-1000 ℃ in a dryer at a speed of 15-50 ℃ per hour, and preserving heat for 1-2 hours;
(4) Immersing the biscuit obtained in the step (3) into a dyeing liquid for dyeing for 15 seconds, sucking off excessive dyeing liquid, and drying in a dryer with the temperature of 100 ℃;
(5) And (3) raising the temperature of the bracket in the step (4) to 1400-1500 ℃ in a dryer at a speed of raising the temperature by 300 ℃ per hour, preserving the heat for 2-3 hours, and naturally cooling to room temperature to form the colored transparent zirconia ceramic bracket.
The dyeing liquid comprises the following raw materials in parts by weight:
100 parts of deionized water, 0.4-46 parts of erbium nitrate colorant, 0.06-2.4 parts of praseodymium nitrate colorant and 0.04-3.66 parts of ferric chloride colorant.
The dyeing color value of the dyeing in the step (4) is A1-A5, B1-B5 and C1-C5 of the VITA clinical colorimetric plate.
The ceramic powder in the mixed powder is 82-86 parts by weight, and the binder is 14-18 parts by weight.
The ceramic powder comprises high-purity nano zirconia powder, yttrium oxide powder with the content of less than 5 mol%, alkaline earth metal oxide with the content of less than or equal to 5 mol%, trivalent element oxide with the content of 0.2-10 mol% and silicon dioxide with the content of 6-17 mol%.
The binder comprises paraffin wax, high-density polyethylene, polypropylene and stearic acid, wherein the alkaline earth metal oxide is selected from calcium oxide, barium oxide, magnesium oxide or/and strontium oxide, and the trivalent element oxide is selected from aluminum oxide, lanthanum oxide or/and bismuth oxide.
In detail, the invention relates to an injection molding production process of colored transparent zirconia ceramic bracket powder for orthodontic treatment, which comprises the following steps:
(1) Preparation of the slurry
Ceramic powder with the content of less than 5% mol of Y2O3 powder as a stabilizer is doped into high-purity nano zirconia powder, an adhesive formed by combining paraffin, high-density polyethylene, polypropylene and stearic acid is added, and the proportion of the ceramic powder to the adhesive is (86-82): (14-18), mixing the two materials, and banburying the mixture into mixed powder on an internal mixer.
(2) Injection molding and biscuit processing
Injecting the mixed powder mixed in the step (1) into Cheng Tuocao biscuit by a high-speed injection molding machine through a mold, dewaxing and drying by a dewaxing agent, then raising the temperature to 800-1000 ℃ at a rate of 15-50 ℃ per hour under an air atmosphere, preserving heat for 1-2 hours, and discharging all the adhesive out of the bracket biscuit.
(3) Coloring of
Immersing the whole adhesive discharged clean bracket biscuit into a dyeing liquid for dyeing for 15 seconds, wherein the dyeing color value is A1-A5, B1-B5 and C1-C5 of a VITA clinical colorimetric plate, sucking the redundant liquid, and drying at 100 ℃.
The dyeing liquid consists of the following raw materials:
100 parts of deionized water;
0.4-46 parts of an er nitrate colorant;
0.06-2.4 parts of praseodymium nitrate colorant;
0.04-3.66 parts of ferric chloride colorant;
and (3) heating the dyed and dried bracket biscuit to 1400-1500 ℃ at a speed higher than 300 ℃ per hour in an air atmosphere for 2-3 hours, and naturally cooling to room temperature to obtain the colored transparent zirconia ceramic bracket, wherein the transmittance of the colored transparent zirconia ceramic bracket in the visible light range is more than 35% when the thickness of the colored transparent zirconia ceramic bracket is 1 mm.
Embodiment one:
the process steps for preparing the coloring transparent zirconia ceramic bracket for orthodontic treatment are as follows:
(1) Mixing ceramic powder and a binder into mixed powder by an internal mixer, wherein the weight part of the ceramic powder is 82 parts, and the weight part of the binder is 14 parts; the ceramic powder comprises high-purity nano zirconia powder, yttrium oxide powder with the content of less than 5 mol%, alkaline earth metal oxide with the content of less than or equal to 5 mol%, trivalent element oxide with the content of 0.2 mol% and silicon dioxide with the content of 6 mol%, and the binder comprises paraffin, high-density polyethylene, polypropylene and stearic acid; the alkaline earth metal oxide is selected from calcium oxide, barium oxide, magnesium oxide or/and strontium oxide, and the trivalent element oxide is selected from aluminum oxide, lanthanum oxide or/and bismuth oxide.
(2) Injecting the mixed powder in the step (1) into a bracket biscuit through a die on a high-speed injection molding machine, and demolding for later use;
(3) Raising the temperature of the biscuit obtained in the step (2) to 800 ℃ in a dryer at a speed of raising the temperature by 15 ℃ per hour, and preserving the temperature for 1 hour;
(4) Immersing the biscuit obtained in the step (3) into a dyeing liquid for dyeing for 15 seconds, sucking off excessive dyeing liquid, and drying in a dryer with the temperature of 100 ℃;
(5) And (3) raising the temperature of the bracket in the step (4) to 1400 ℃ in a dryer at a speed of raising the temperature to 300 ℃ per hour, preserving the heat for 2-3 hours, and naturally cooling to room temperature to form the colored transparent zirconia ceramic bracket.
The dyeing liquid comprises the following raw materials in parts by weight:
100 parts of deionized water, 0.4 part of erbium nitrate colorant, 2.4 parts of praseodymium nitrate colorant and 3.66 parts of ferric chloride colorant. The dyeing color value of the dyeing in the step (4) is A1-A5, B1-B5 and C1-C5 of the VITA clinical colorimetric plate.
Embodiment two:
the process steps for preparing the coloring transparent zirconia ceramic bracket for orthodontic treatment are as follows:
(1) Mixing 86 parts by weight of ceramic powder and 18 parts by weight of binder by an internal mixer; the ceramic powder comprises high-purity nano zirconia powder, yttrium oxide powder with the content of less than 5 mol%, alkaline earth metal oxide with the content of less than or equal to 5 mol%, trivalent element oxide with the content of 10 mol% and 17 mol% silicon dioxide, and the binder comprises paraffin, high-density polyethylene, polypropylene and stearic acid; the alkaline earth metal oxide is selected from calcium oxide, barium oxide, magnesium oxide or/and strontium oxide, and the trivalent element oxide is selected from aluminum oxide, lanthanum oxide or/and bismuth oxide.
(2) Injecting the mixed powder in the step (1) into a bracket biscuit through a die on a high-speed injection molding machine, and demolding for later use;
(3) Raising the temperature of the biscuit obtained in the step (2) to 1000 ℃ in a dryer at a speed of raising the temperature by 50 ℃ per hour, and preserving the temperature for 1-2 hours;
(4) Immersing the biscuit obtained in the step (3) into a dyeing liquid for dyeing for 15 seconds, sucking off excessive dyeing liquid, and drying in a dryer with the temperature of 100 ℃;
(5) And (3) raising the temperature of the bracket in the step (4) to 1500 ℃ in a dryer at a speed of raising the temperature to 300 ℃ per hour, preserving the heat for 3 hours, and naturally cooling to room temperature to form the colored transparent zirconia ceramic bracket.
The dyeing liquid comprises the following raw materials in parts by weight:
100 parts of deionized water, 46 parts of erbium nitrate colorant, 0.06 part of praseodymium nitrate colorant and 3.66 parts of ferric chloride colorant. The dyeing color value of the dyeing in the step (4) is A1-A5, B1-B5 and C1-C5 of the VITA clinical colorimetric plate.
Embodiment III:
the process steps for preparing the coloring transparent zirconia ceramic bracket for orthodontic treatment are as follows:
(1) Mixing ceramic powder and a binder into mixed powder by an internal mixer, wherein the weight parts of the ceramic powder are 84 parts, and the weight parts of the binder are 16 parts; the ceramic powder comprises high-purity nano zirconia powder, yttrium oxide powder with the content of less than 5 mol%, alkaline earth metal oxide with the content of less than or equal to 5 mol%, trivalent element oxide with the content of 5 mol% and 12 mol% silicon dioxide, and the binder comprises paraffin, high-density polyethylene, polypropylene and stearic acid; the alkaline earth metal oxide is selected from calcium oxide, barium oxide, magnesium oxide or/and strontium oxide, and the trivalent element oxide is selected from aluminum oxide, lanthanum oxide or/and bismuth oxide.
(2) Injecting the mixed powder in the step (1) into a bracket biscuit through a die on a high-speed injection molding machine, and demolding for later use;
(3) Raising the temperature of the biscuit obtained in the step (2) to 900 ℃ in a dryer at a speed of raising the temperature by 35 ℃ per hour, and preserving the temperature for 1.5 hours;
(4) Immersing the biscuit obtained in the step (3) into a dyeing liquid for dyeing for 15 seconds, sucking off excessive dyeing liquid, and drying in a dryer with the temperature of 100 ℃;
(5) And (3) raising the temperature of the bracket in the step (4) to 1450 ℃ at a speed of 300 ℃ per hour in a dryer, preserving heat for 2.5 hours, and naturally cooling to room temperature to form the colored transparent zirconia ceramic bracket.
The dyeing liquid comprises the following raw materials in parts by weight:
100 parts of deionized water, 20 parts of erbium nitrate colorant, 1.5 parts of praseodymium nitrate colorant and 3 parts of ferric chloride colorant. The dyeing color value of the dyeing in the step (4) is A1-A5, B1-B5 and C1-C5 of the VITA clinical colorimetric plate.
The foregoing description is only of embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (6)
1. A coloured transparent zirconia ceramic bracket comprising a base plate (1), characterized in that: the novel ligature device is characterized in that a groove (2) is formed in the middle of the top surface of the bottom plate (1), a ligature wing groove (3) is formed in the outer side of the bottom plate (1), a front groove wing (4) and a rear groove wing (5) are fixedly connected to the front side and the rear side of the top end of the bottom plate (1) respectively, a first clamping groove (6) is formed in the top of the front groove wing (4), a fixing hole (7) is formed in the top of the front groove wing (4), a fixing mechanism (8) is inserted into the inner side of the fixing hole (7), and a second clamping groove (9) is formed in the top of the rear groove wing (5);
the fixing mechanism (8) comprises a bolt (81), the bottom end of the bolt (81) is inserted into the inner side of the fixing hole (7), the top end of the bolt (81) is fixedly connected with a leaf spring (82), the top end of the bolt (81) is movably connected with an elastic limiting piece (83), the front side and the rear side of the top end of the elastic limiting piece (83) are respectively fixedly connected with a front silica gel covering piece (84) and a rear silica gel covering piece (85), the bottom end of the elastic limiting piece (83) is abutted against an arch wire (86), the top end of the bolt (81) is provided with a rotary groove, the inner side of the rotary groove is movably connected with the front side of the top end of the elastic limiting piece (83), the number of the leaf springs (82) is two, the bottom ends of the two leaf springs (82) are respectively and fixedly connected to the left side and the right side of the top end of the bolt (81), the outer sides of the top ends of the two leaf springs (82) are both clamped on the inner side of the first clamping groove (6), the top ends of the elastic limiting sheets (83) are clamped on the inner side of the second clamping groove (9), the bottom ends of the elastic limiting sheets (83) are clamped on the inner side of the groove (2), the front sides of the top ends of the elastic limiting sheets (83) are fixedly connected with rotating balls, the bottom ends of the front silica gel covering sheets (84) are abutted on the top ends of the leaf springs (82), the outer sides of the front silica gel covering sheet (84) and the rear silica gel covering sheet (85) are respectively clamped on the inner sides of the first clamping groove (6) and the second clamping groove (9), the outer sides of the archwires (86) are wound on the outer sides of the ligature wing grooves (3), and the outer sides of the archwires (86) are sleeved on the inner sides of the grooves (2) in a penetrating mode;
the bracket comprises the following raw materials, by weight, 82-86 parts of mixed powder formed by ceramic powder and 14-18 parts of binder; the ceramic powder comprises high-purity nano zirconia powder, yttrium oxide powder with the content of less than 5 mol%, alkaline earth metal oxide with the content of less than or equal to 5 mol%, aluminum oxide with the content of 0.2-10 mol%, lanthanum oxide or/and bismuth oxide, and silicon dioxide with the content of 6-17 mol%; the binder comprises paraffin wax, high density polyethylene, polypropylene and stearic acid, and the alkaline earth metal oxide is selected from calcium oxide, barium oxide, magnesium oxide or/and strontium oxide.
2. A powder injection molding process for making a colored transparent zirconia ceramic bracket as defined in claim 1, comprising the steps of:
(1) Mixing ceramic powder and binder into mixed powder by an internal mixer;
(2) Injecting the mixed powder in the step (1) into a bracket biscuit through a die on a high-speed injection molding machine, and demolding for later use;
(3) Raising the temperature of the biscuit obtained in the step (2) to 800-1000 ℃ in a dryer at a speed of 15-50 ℃ per hour, and preserving heat for 1-2 hours;
(4) Immersing the biscuit obtained in the step (3) into a dyeing liquid for dyeing for 15 seconds, sucking off excessive dyeing liquid, and drying in a dryer with the temperature of 100 ℃;
(5) And (3) raising the temperature of the bracket in the step (4) to 1400-1500 ℃ in a dryer at a speed of raising the temperature by 300 ℃ per hour, preserving the heat for 2-3 hours, and naturally cooling to room temperature to form the colored transparent zirconia ceramic bracket.
3. The powder injection molding process of the colored transparent zirconia ceramic bracket according to claim 2, wherein the coloring liquid comprises the following raw materials in parts by weight:
100 parts of deionized water, 0.4-46 parts of erbium nitrate colorant, 0.06-2.4 parts of praseodymium nitrate colorant and 0.04-3.66 parts of ferric chloride colorant.
4. The powder injection molding process of a colored transparent zirconia ceramic bracket according to claim 2, wherein the color values of the color in the step (4) are A1-A5, B1-B5 and C1-C5 of the VITA clinical color chart.
5. The powder injection molding process of a colored transparent zirconia ceramic bracket according to claim 2, wherein the weight part of the ceramic powder in the mixed powder is 82-86 parts, and the weight part of the binder is 14-18 parts.
6. The powder injection molding process of a colored transparent zirconia ceramic bracket according to claim 5, wherein the ceramic powder comprises high purity nano zirconia powder, yttria powder with a content of less than 5 mol%, alkaline earth metal oxide with a content of 5 mol% or less, aluminum oxide with a content of 0.2 to 10 mol%, lanthanum oxide or/and bismuth oxide, and silica with a content of 6 to 17 mol%; the binder comprises paraffin wax, high density polyethylene, polypropylene and stearic acid, and the alkaline earth metal oxide is selected from calcium oxide, barium oxide, magnesium oxide or/and strontium oxide.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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