CN114903625A - A kind of dental orthodontic bracket made of chemically strengthened glass and its manufacturing method - Google Patents

Abstract

The invention discloses a bracket for dental orthodontics made of chemically reinforced glass and a manufacturing method thereof. The high-alumina silicate glass is selected, the raw material purity is high, the transparency is high, the strength is good, the chemical stability is good, and the strength of the high-alumina silicate glass can be greatly improved after chemical enhancement. The bracket of the invention almost has all the advantages of stainless steel, single crystal and ceramic brackets: such as small size, beautiful appearance, high hardness, high strength, firm adhesion, easy detachment, etc., and overcomes their respective disadvantages. The manufacturing method of the invention can manufacture brackets with various specifications and shapes at one time, including the totally transparent self-ligating bracket which is not sold in the market at present. The invention has simple and practical manufacture and is easy to realize automatic production.

Description

A kind of dental orthodontic bracket made of chemically strengthened glass and its manufacturing method

technical field

The invention relates to the field of medical instruments, in particular to a dental orthodontic bracket made of chemically strengthened glass and a manufacturing method thereof.

Background technique

Orthodontic brackets are a very popular medical device. They can be used for tens of millions of pairs of dentition and other symptoms every year. There are many varieties of orthodontic brackets, and a very important difference is with or without the self-locking function. The self-locking bracket has a good therapeutic effect and is easy to use, which is deeply favored by doctors, and its market price is also much higher than that of the bracket without self-locking function.

At present, the materials of commercially available orthodontic brackets are mainly stainless steel, alumina ceramics and alumina single crystal. The brackets of these three materials have their own advantages and disadvantages: stainless steel brackets are low in production cost, small in size, firm in bonding, and easy to remove, but the color of stainless steel brackets is often rejected by patients because of their unsightly color; ceramic brackets are generally translucent. It is more suitable for the color of the teeth and has a beautiful appearance, but it is difficult to have both mechanical strength and transparency. During the treatment process, problems such as broken wings, overall falling off and not easy to take off are prone to occur, and the product quality is very unstable; single crystal trays The groove is very beautiful because of its full transparency, and its strength and hardness are also very good. However, it is based on single crystals and all rely on processing methods such as mechanical grinding and laser cutting, so the processing cost is high and the production efficiency is low. So far, there is no finished single crystal self-locking bracket on the market, because the shape of the self-locking bracket is relatively complex, and the high production cost makes it difficult to participate in the market competition.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above problems, and provide an orthodontic bracket made of chemically strengthened glass and a manufacturing method thereof. To achieve the above object, the present invention adopts the following technical solutions:

A dental orthodontic bracket made of chemically strengthened glass, the bracket is made of chemically strengthened glass.

The invention also discloses a pressing mold for orthodontic brackets made of chemically strengthened glass. The mold is in the form of a half mold, including a lower template, an upper left template and an upper right template, and the lower template is provided with stoppers on both sides. The baffle plate is fixedly connected to the lower template by fixing screws, the upper left template and the upper right template are provided with a protrusion and a push-pull rod, and the baffle is provided with a limit slot matched with the protrusion, By moving the push-pull rod, the upper left template and the upper right template slide along the limit slot;

The lower template, the upper left template, and the upper right template enclose a mold cavity of the bracket, the mold cavity is provided with a molding strip, the top is provided with an upper indenter module, and the lower template is provided with a mold core at the bottom position of the mold cavity, The mold core is provided with a molding seam for clamping the molding.

As an improvement, the bottom of the upper indenter module is in the shape of a convex arc.

As an improvement, the moldings are straight or are further provided with push-plate moldings and round-hole moldings on the side.

The invention also discloses a method for manufacturing orthodontic brackets made of chemically reinforced glass, wherein the brackets are manufactured by pressing and forming hot-melt materials, and the specific method includes the following steps:

S1. Glass melting

Melt the glass frit in a crucible above 1250°C;

S2. Feeding

Use scissors to cut a piece of glass drop material according to the required amount on the drop material supply machine connected to the discharge port of the crucible, and then quickly drop it onto the cavity of the pressing mold for pressing and forming; The core, the upper left template and the upper right template are heated and insulated;

S3. Mold pressing

Insert the molding on the molding seam of the mold core, and close the mold; after the glass frit is sent to the mold cavity, the upper indenter module is quickly pressed down to the predetermined position, so that the glass frit fills the mold cavity, thereby completing the pressing action; Compression molding adopts the method of overflowing, so as to prevent the glass frit in the mold cavity from losing temperature too quickly;

S4. Acid etching to remove fillets

The filler is made of metal material; after the bracket is pressed and formed, the bracket and the filler are immersed in high-concentration hydrochloric acid; after the filler is acid-etched, the bracket is taken out, washed and dried;

S5. Annealing

Keep the temperature at the glass annealing point for 20 minutes to eliminate the thermal stress generated during molding;

S6. Chemical Enhancement

Immerse the annealed brackets in a potassium nitrate solution heated to 420°C for more than 12 hours;

As an improvement, the brackets are subjected to bottom texturing treatment after acid etching in step S5, and the specific method is to soak the bottom of the brackets with hydrofluoric acid for 3-8 hours.

As an improvement, the brackets are coated with a transparent hard film after S6 chemical enhancement.

As an improvement, the bottom of the bracket is provided with an arc surface that matches the teeth, and the arc surface is concave-convex pattern, smooth or textured with hydrofluoric acid.

The advantages of the present invention are:

1. The present invention uses high-alumina silicate glass, which has high raw material purity, high transparency, good strength and good chemical stability. After chemical strengthening, its own strength can be greatly improved. The bracket of the present invention has almost all the advantages of stainless steel, single crystal and ceramic brackets, such as small size, beautiful appearance, high hardness, high strength, strong adhesion, easy disassembly, etc., and overcomes their respective shortcomings.

2. The manufacturing method of the present invention can manufacture brackets of various specifications and shapes at one time, including fully transparent self-locking brackets that are not commercially available today. The invention is simple to manufacture, practical and easy to realize automatic production.

Description of drawings

Fig. 1 is the top view of bracket in embodiment 1;

Fig. 2 is the front view of bracket in embodiment 1;

Fig. 3 is the structural diagram of the mould in the embodiment 1;

4 is a cross-sectional view of a mold in Example 1;

Fig. 5 is the structural diagram of the fillet in embodiment 1;

6 is a structural diagram of a bracket in Embodiment 2;

Fig. 7 is the top view of bracket in embodiment 2;

8 is a structural diagram of a self-locking push plate in Embodiment 2;

Fig. 9 is the structural diagram of the fillet in embodiment 2;

FIG. 10 is a structural diagram of the bracket in Embodiment 2. FIG.

Indicated in the figure:

1- Lower template, 2- Upper left template, 3- Upper right template, 4- Core, 5- Filling strip, 51- Straight board, 52- Pushing plate molding, 53- Round hole molding, 6- Upper indenter module, 7- Filling slot, 8- Push-pull rod, 9- Baffle plate, 91- Fixing screw, 92- Limit slot, 10- Self-locking push plate, 11- Chute, 12- Small round hole.

Detailed ways

The present invention will be described in detail and concretely below through specific embodiments, so as to better understand the present invention, but the following embodiments do not limit the protection scope of the present invention.

Example 1

This embodiment discloses an orthodontic bracket made of chemically strengthened glass.

The brackets are made of chemically strengthened glass. The bottom of the bracket is provided with an arc surface that matches the teeth, and the arc surface is etched and textured with hydrofluoric acid.

This embodiment also discloses a pressing mold for orthodontic brackets made of chemically strengthened glass.

The mold is in the form of a half mold, including a lower template 1 , an upper left template 2 and an upper right template 3 , baffles 9 are provided on both sides of the lower template, and the baffles 9 are fixedly connected to the lower template 1 by fixing screws 91 . The upper left template 2 and the upper right template 3 are provided with a protrusion and a push-pull rod 8, and the baffle 9 is provided with a limit slot 92 that cooperates with the protrusion. The limiting slot 92 slides.

The lower die plate 1, the upper left die plate 2, and the upper right die plate 3 form the cavity of the bracket. There is a molding 5 inside the die cavity, an upper indenter module 6 on the top, and a die core 4 at the bottom of the die cavity corresponding to the lower die plate 1. , the mold core 4 is provided with a molding seam 7 for clamping the molding 5.

The bottom of the upper indenter module 6 is in the shape of a convex arc surface, which can form an arc surface at the bottom of the bracket during pressing.

In this embodiment, the fillet 5 is in the shape of a straight plate.

The invention also discloses a manufacturing method of a dental orthodontic bracket made of chemically strengthened glass. The bracket is manufactured by a hot-melt material pressing and molding method, and the specific method includes the following steps:

S1. Glass melting

In this embodiment, high-alumina silicate glass is used, and its composition is: 5% Na ₂ O, 2% CaO, 7% Al ₂ O ₃ , 73% SiO ₂ , and others are 3% ZrO ₂ , ZnO, Li ₂ O .

The glass frit is melted in a crucible above 1250°C. At this time, the viscosity of the glass frit is log3-4dPa·s, which has good fluidity and can ensure that the frit can flow out of the discharge port smoothly.

S2. Feeding

Use scissors to cut a piece of glass drop material according to the required amount on the drop material supply machine connected to the discharge port of the crucible, and then quickly drop it onto the cavity of the pressing mold for pressing and forming; The core, the upper left template and the upper right template are heated and kept warm to keep the cavity temperature around 700-750°C.

S3. Mold pressing

Insert the molding on the molding seam of the mold core, and close the mold; after the glass frit is sent to the mold cavity, the upper indenter module is quickly pressed down to the predetermined position, so that the glass frit fills the mold cavity, thereby completing the pressing action; Compression molding adopts the method of overflowing, so as to prevent the glass frit in the mold cavity from losing temperature too quickly;

S4. Acid etching to remove fillets

The moldings are made of ordinary iron materials; after the brackets are pressed and formed, the brackets and moldings are immersed in high-concentration hydrochloric acid; after the moldings are acid-etched, the brackets are taken out, washed, and dried;

S5. Annealing

Keep the temperature at the glass annealing point for 20 minutes to eliminate the thermal stress generated during molding;

S5-1. Bottom texturing treatment

Using hydrofluoric acid to soak the bottom of the bracket for 3-8 hours can make the bottom of the bracket fully textured to improve the bonding fastness;

S6. Chemical Enhancement

The annealed brackets were immersed in a potassium nitrate solution heated to 420°C for more than 12 hours. Make the product produce a diffusion layer with K ion concentration from high to low from the surface to the inside, and the thickness of the diffusion layer can reach more than 100um. The strength of the reinforced glass bracket of the present invention can generally reach more than 5 to 6 times of the original after chemical strengthening, and can fully meet the requirements for the strength of the bracket in orthodontic treatment;

S6-1. Plating transparent hard film after chemical enhancement

A layer of ZrO2 ceramic film is plated by PVD method; the film thickness is ~100nm, HV1500. Its high hardness not only improves the wear resistance of glass brackets, but also provides an ultra-low friction coefficient for stainless steel and nitinol wires, thus effectively shortening the time for orthodontic treatment.

Example 2

This embodiment discloses a passive self-locking bracket.

In this embodiment, the top of the bracket is provided with a self-locking push plate 10 , and correspondingly, a chute 11 for installing the self-locking push plate and a small round hole 12 in the chute 11 are added to the bracket. A high elastic filament is installed in the small round hole 12 . The bottom of the self-locking push plate 10 is provided with a groove for accommodating high elastic filaments, and the high elastic filaments are respectively connected to the bottom of the small round hole 10 and the bottom of the self-locking push plate 10 to achieve the purpose of self-locking.

The molding 5 in this embodiment includes a straight plate 51 , a push plate molding 52 and a round hole molding 53 provided on the side of the straight board 51 . In order to form the chute 11 and the small round hole 12 on the bracket during press forming.

Other technical solutions of this embodiment are the same as those of Embodiment 1.

The specific embodiments of the present invention have been described above in detail, but they are only used as examples, and the present invention is not equivalent to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be included within the scope of the present invention.

Claims (8)

1. A bracket for dental orthodontics, which is made of chemically reinforced glass, is characterized in that the bracket is made of chemically reinforced glass.

2. A pressing die for a bracket for dental orthodontics made of chemically strengthened glass according to claim 1, wherein the die is in a half die form and comprises a lower die plate, a left upper die plate and a right upper die plate, baffle plates are arranged on two sides of the lower die plate and fixedly connected with the lower die plate through fixing screws, a protruding portion and a push-pull rod are arranged on the left upper die plate and the right upper die plate, a limiting groove hole matched with the protruding portion is formed in each baffle plate, and the left upper die plate and the right upper die plate slide along the limiting groove hole by moving the push-pull rod;

the lower template, the left upper template and the right upper template enclose a die cavity of the bracket, a fillet is arranged inside the die cavity, an upper pressure head module is arranged at the top of the die cavity, a die core is arranged at the position of the lower template corresponding to the bottom of the die cavity, and a fillet seam for clamping the fillet is arranged on the die core.

3. The pressing die for the orthodontic bracket made of the chemically strengthened glass as claimed in claim 2, wherein the bottom of the upper pressure head module is in a convex arc shape.

4. The die for pressing the orthodontic bracket made of the chemically strengthened glass as set forth in claim 2, wherein the fillet is a straight plate or a push plate fillet and a round hole fillet are further provided on the side.

5. The method for manufacturing the bracket for the dental orthodontic appliance made of the chemically reinforced glass as claimed in claim 2, wherein the bracket is manufactured by adopting a hot melt compression molding method, and the method comprises the following steps:

s1. glass melting

Melting the glass material in a crucible at 1250 ℃ or above;

s2, feeding

Cutting off a section of glass gob by using scissors on a gob supply machine connected with a discharge port of the crucible according to the required amount, and then rapidly dropping the glass gob onto a mold cavity of a pressing mold for pressing and molding; heating and insulating the lower template, the mold core, the upper left template and the upper right template during feeding;

s3, die pressing

Inserting a fillet into the fillet seam of the mold core, and closing the mold; after the glass melt is sent into the die cavity, the upper pressure head module is quickly pressed to a preset position, so that the die cavity is filled with the glass melt, and the pressing action is finished; the press forming adopts a flash mode, so that the glass melting material in the die cavity is prevented from being overheated too quickly;

s4, removing the embedded strip by acid etching

The embedded strip is made of metal; after the bracket is pressed and formed, the bracket and the insertion strip are immersed into high-concentration hydrochloric acid; taking out the bracket after the fillet is subjected to acid etching, cleaning and drying;

s5, annealing

Keeping the temperature at the annealing point of the glass for 20 minutes to eliminate the thermal stress generated during the forming;

s6. chemical enhancement

The annealed bracket was immersed in a potassium nitrate solution heated to 420 ℃ and held for 12 hours or more.

6. The method for manufacturing a bracket for orthodontic treatment by using chemically strengthened glass as claimed in claim 5, wherein the bracket is subjected to bottom texturing after acid etching in step S5, and the method comprises immersing the bottom of the bracket in hydrofluoric acid for 3-8 hours.

7. A method for making a bracket for an orthodontic treatment using a chemically strengthened glass as set forth in claim 5, wherein the bracket is chemically strengthened at S6 and then coated with a transparent hard film.

8. The bracket for dental orthodontics made of chemically strengthened glass according to claim 1, wherein the bottom of the bracket is provided with a tooth-fitting curved surface, and the curved surface is embossed, smooth or roughened by hydrofluoric acid etching.

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