JP2844317B2 - Dental materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stainless steel dental material used for artificially correcting teeth and the like, and more particularly to a method for applying a wear-resistant ceramic thin film having a milky to pale yellow color tone. Or, after applying a gold-containing alloy plating, a transparent and wear-resistant ceramic thin film is applied to obtain a color tone similar to that of natural teeth and to prevent dental discoloration due to tooth brushing and the like. is there.

[0002] Here, the alloy plating containing gold refers to alloy plating that has been co-precipitated, or alloy plating that has been alloyed by performing diffusion annealing after plating the constituent metals in multiple layers.

[0003]

2. Description of the Related Art Conventionally, alloys such as stainless steel and Ni-Ti which is a kind of shape memory alloy have been used for dental steel wires. And a coating film formed by baking of tetrafluoroethylene resin (registered trademark Teflon). However, the above-mentioned dental steel wire has defects such as that the coating of the steel wire is strangely noticeable as compared with the color of the tooth while being worn for the treatment of the tooth, and the coating is easily peeled off. .

[0004] In addition, stainless steel is mainly used as a dental bracket, and although it is excellent in strength, it is too conspicuous and inferior in aesthetics as in the case of a dental steel wire.

[0005]

[0006] Good aesthetic materials include plastics and ceramics, but these materials have weaknesses in strength, and have defects such as the possibility of breakage and dropout during treatment.

SUMMARY OF THE INVENTION In view of the problem that stainless steel and shape memory alloys are much more noticeable than the ivory color of teeth, the object of the present invention is to prevent corrosion and discoloration by subjecting a conventional metallic dental material to surface treatment. An object of the present invention is to provide a dental material such as a bracket or a steel wire, which is inconspicuous, does not break and has excellent aesthetics.

[0007]

In order to achieve the above object, the present invention provides a stainless steel dental bracket and a steel wire, in which an alloy containing gold having a milky to pale yellow aesthetic color is provided. After the plating film is formed, a transparent and wear-resistant ceramic thin film is formed.

[0008]

According to the present invention, stainless steel (preferably, austenitic stainless steel) having high strength and excellent ductility and corrosion resistance is used for dental materials such as dental brackets and dental steel wires. Apply a wear-resistant ceramic thin film with a milky to pale yellow color on the surface by vacuum evaporation, sputtering, precision spraying, or other methods, or use gold plating by electroplating, vacuum evaporation, or sputtering. Subjected to multi-layer plating containing
By heating in a non-oxidizing atmosphere, the metal of each plating layer is thermally diffused and alloyed to form a milky white to pale yellow color, and then transparent and wear-resistant by vacuum evaporation, sputtering, precision spraying, etc. By applying a ceramic thin film, it is inconspicuous, not damaged, hardly discolored by abrasion,
Good aesthetics are obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, in the present invention, a dental material such as a dental bracket or a dental steel wire is provided with an aesthetic color of ivory having excellent corrosion resistance. In the case of the dental steel wire 1, a wear-resistant ceramic thin film 4 having a milky to pale yellow color tone is applied to the surface of the stainless steel wire 2 by a vacuum evaporation method, a sputtering method, a precision spraying method or the like.

As shown in FIG. 2, the dental steel wire 1a
After a metal plating film 3 is formed on the surface of the stainless steel wire 2 by electroplating, vacuum evaporation, sputtering or the like, a transparent ceramic thin film 4a is formed. However, it is difficult to obtain an appropriate color tone with a single metal plating, and it is obtained by applying an alloy plating. The components of alloy plating that have excellent corrosion resistance and do not adversely affect the human body include gold, platinum, silver, palladium,
It is necessary to select rhodium or the like. Gold has a golden color tone, and platinum, silver, palladium, rhodium, etc. have a white color tone. Therefore, in order to perform alloy plating having an ivory aesthetic color, gold, platinum, silver,
By performing a binary or more alloy plating with palladium or the like and reducing the content ratio of gold in the alloy plating, the golden color is reduced and the alloy plating film 3 having an ivory color tone is obtained. In order to maintain a milky white to pale yellow color tone, a vacuum evaporation method, a sputtering method,
A transparent and wear-resistant ceramic thin film 4a is applied by a precision spraying method or the like.

Specific Example 1 A dental material made of stainless steel (preferably, austenitic stainless steel) is washed, and fats and oils adhering to the surface are removed.
Remove dust etc. Next, the dental material is set inside the vacuum chamber and evacuated to a vacuum. After exhausting sufficiently, heat it to evaporate the ceramics from the evaporation source, and react the evaporant with the gas using the plasma of the reactive gas,
A wear-resistant ceramic thin film made of nitride, oxide, or carbide such as TiN, Al ₂ O ₃ , SiC, TiC, and TiCN is formed on the surface of the dental material.

Concrete Example 2 First, when a surface of a stainless steel (preferably, austenitic stainless steel) dental material is subjected to silver plating, platinum plating, and gold plating, the surface of the stainless steel is plated. A pretreatment is performed to remove the passivation film such as fats and oils, chromium oxide, and nickel oxide. That is,
After performing alkaline electrolytic degreasing, washing with water, and neutralizing, performing cathodic electrolysis in an aqueous solution of 100 g / lt of hydrochloric acid and 100 g / lt of nickel chloride, washing with water, and removing a passive film on the surface of stainless steel (lt is Let's represent a little).

Next, the process proceeds to a silver plating step, wherein the composition of the silver plating bath is 45 g / lt of silver cyanide and 1 g of free potassium cyanide.
It was adjusted to 00 g / lt, potassium carbonate 15 g / lt, and plated for 2 minutes under the conditions of a plating bath temperature of 25 ° C. and a current density of 0.5 A / dm ^2. As a result, the stainless steel surface had a silver plating coating thickness of 0.60 μm. Deposited.

Then, the process proceeds to a platinum plating step. The composition of the platinum plating bath is 100 g / lt of ammonium nitrate, 10 g / lt of sodium nitrate, 3 g / lt of platinum amino nitrite dissolved in ammonia, and 55 g / lt of ammonium hydroxide.
The plating bath temperature is 97 to 100 ° C. and the current density is 2.
As a result of plating for 32 minutes under the condition of 5 A / dm ² , a platinum plating film thickness of 1.60 μm was deposited on the surface of the silver plating film.

Next, the process proceeds to a gold plating step. The composition of the gold plating bath is 15 g / lt of potassium potassium cyanide, 60 g / lt of ammonium citrate, and 60 g / lt of ammonium sulfate.
, Plating bath temperature 60 ° C, current density 0.5A / d
As a result of plating for 4 minutes under the condition of m ^2, a 1.00 μm-thick gold plating film was deposited on the surface of the platinum plating film.

As described above, the thickness of the silver plating film is 0.60 μm.
m, a dental material formed with a three-layer plating film having a platinum plating film thickness of 1.60 μm and a gold plating film thickness of 1.00 μm was heated in a non-oxidizing atmosphere at a heating temperature of 500 ° C. for 10 minutes. , The gold plating layers diffuse each other,
This resulted in ternary alloy plating of silver-platinum-gold.

Cleaning is performed to remove oils, fats, dusts and the like adhering to the surface of the alloy-plated dental material.
Next, the dental material is set inside the vacuum chamber and evacuated to a vacuum. After exhausting sufficiently, heat it and dissolve alumina particles, which is a ceramic material, with an electron beam.
A transparent alumina thin film is formed on the surface of an alloy plating film of a dental material.

As a result of using the above-mentioned dental material for orthodontic patients, a dental material obtained by applying a wear-resistant ceramics thin film having an aesthetic color of milky white to pale yellow on a stainless steel wire is also a stainless steel wire. After alloy plating on
Even a dental material provided with a transparent and wear-resistant ceramic thin film has a color tone similar to that of a human tooth, so that it is difficult to recognize that orthodontics is being performed.

By the way, the corrosion resistance and abrasion resistance when a transparent and wear-resistant ceramics thin film is applied to an orthodontic patient after the above-described alloy plating is applied is important as a dental material. That is what. Since saliva is weakly acidic in addition to food residues remaining in the mouth of humans, if the dental material turns black due to food residues or saliva, or if the ceramics thin film or plating film is worn away by tooth brushing, the stainless steel material will be lost. May be exposed.

From the above-mentioned point of view, in order to investigate the corrosion resistance and abrasion resistance of the dental material according to the present invention, as a result of trial use of the dental material in orthodontic patients, 6 months after the start of wearing, In addition, it was not recognized that the dental material turned black or that the ceramic thin film or plating film of the dental material was worn away or peeled off by tooth brushing or the like, and that the stainless steel substrate was exposed.

According to the dentist, the dental material can be put to practical use if it has been worn for about three months without discoloration or wear, so that the dental material according to the present invention maintains a sufficiently stable quality. Proved to be something.

[0022]

As described above, the present invention provides, as a dental material, an alloy containing stainless steel having excellent corrosion resistance and containing gold having an aesthetic color of milky to pale yellow on the surface of the stainless steel. An aesthetic dental material with a milky to pale yellow color tone similar to natural teeth, with improved corrosion and wear resistance by applying a transparent and wear-resistant ceramic thin film after the plating film is applied. Is obtained,
Its practical value is extremely high.

In the dental material according to the present invention, since the multi-layered alloy plating film containing gold is covered with a transparent and wear-resistant ceramic thin film, the Ni content in the stainless steel is reduced.
Is blocked, and there is no problem in using it for a person allergic to Ni.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an end of a dental steel wire according to a first embodiment of the present invention in a cutaway manner.

FIG. 2 is a cross-sectional view showing an end of a dental steel wire according to a second embodiment of the present invention in a cutaway manner.

[Explanation of symbols]

1: Dental steel wire 1a: Dental steel wire with diffusion alloy plating film 2: Stainless steel wire 3: Diffusion alloy plating film 4: Ceramic thin film 4a: Transparent ceramic thin film

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C25D 7/00 C23C 14/06 A // C23C 14/06 B H 14/08 A 14/08 (72) Inventor Kiyoshi Ogawa Okegawa-shi, Saitama 2-5-6 Minami (56) References JP-A-62-164450 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61C 7/14 A61C 7/28 A61K 6/00 C23C 16/30 C23C 28/00 C25D 7/00 C23C 14/06 C23C 14/08

Claims (1)

(57) [Claims] A stainless steel dental bracket and a steel wire are coated with a gold-containing alloy plating film having an aesthetic color of milky white to pale yellow, and then a transparent and wear-resistant ceramic thin film is formed. A dental material characterized by being applied.