JP2007186458A - Teeth bleaching method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bleaching method easily applying and keeping a sufficient amount of teeth bleaching material necessary for bleaching the teeth and performing the treatment in a simpler manner, even in the case where a light irradiation unit of high intensity is used, in a bleaching treatment using a teeth bleaching material formed by combining a compound containing titanium oxide effecting a photocatalytic action by irradiation with light and a compound generating hydrogen peroxide in an aqueous solution. <P>SOLUTION: The teeth bleaching method characterised in that a necessary and sufficient amount of the teeth bleaching material can be applied and kept by putting a water-absorbing sheet impregnated with the teeth bleaching material on the teeth surface when the teeth bleaching material formed by combining the titanium oxide effecting a photocatalytic action by irradiating with light and the compound generating hydrogen peroxide in an aqueous solution is applied to discolored teeth. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bleaching method for bleaching and removing pigments (coloring, discoloration) deposited on teeth. More specifically, bleaching of a discolored tooth characterized in that a bleaching material having a specific composition having photocatalytic activity is attached to the surface of the discolored tooth, and the tooth is bleached based on a photocatalytic action caused by irradiating the part with light. It is about the method.

  In recent years, in dental practice, there has been a strong demand for improving aesthetics such as tooth shape, arrangement, and harmony, especially when young women seek dental practice to whiten teeth as an important cosmetic element. Is increasing. In general, the causes of tooth discoloration or pigmentation (pigmentation, stain) are the deposition of colored substances (tobacco, tea astringency, etc.), pigment-producing bacteria, discoloration of restorations (mainly composite resins), metal salts (mainly So-called extrinsic substances such as amalgam, silver nitrate, silver ammonia) and so-called intrinsic substances due to aging, chemical substances and drugs (fluorine, tetracycline, etc.), metabolic abnormalities, genetic diseases, tooth injury, etc. ).

  As a method for improving the aesthetics of discolored teeth, several methods have been proposed in the past. Among them, the bleaching method has some problems such as a slight backlash. It can be said that this is an excellent treatment method with high preservation of the tooth quality. This bleaching method is basically a method of removing a colored substance by a chemical reaction. Conventionally, the bleaching method for vital teeth and the non-vital bleaching method are mainly used. A bleaching material composed of various chemical agents and a bleaching method using the same have been reported.

  By the way, with respect to the bleaching material and bleaching method used for tooth bleaching, (a) the bleaching effect is remarkable, (b) the drug used is not toxic, (c) the work is simple, (d Various conditions are required such as :) the physical properties of the tooth are not deteriorated, (e) effective for both vital teeth and inactivated teeth, and (f) the bleaching effect appears in a short period of time. However, the bleaching material and the bleaching method that have been used in the past are based on the fact that 30 to 35% by weight of hydrogen peroxide water having strong tissue corrosivity is used as a main agent and bleaching is performed by its oxidizing action. There were problems with simplicity and safety.

  In view of the current state of the bleaching method as described above, titanium oxide having a photocatalytic action as a new bleaching method and bleaching method which is excellent in safety and simplicity and has a remarkable effect on both myelinated and nonmedullary teeth in a short period of time. It has been reported that a bleaching material using a combination of a low-concentration hydrogen peroxide solution is effective (see Patent Document 1).

  In tooth bleaching material consisting of a combination of these photocatalytic titanium oxide and a compound that generates hydrogen peroxide in aqueous solution, inorganic clay minerals such as saponite and hectorite and inorganic thickeners such as silica gel or sodium polyacrylate, Organic thickeners such as methylcellulose and carboxymethylcellulose have been used (see Patent Documents 1 and 2). However, when an organic thickener is used among these thickeners, the decomposition reaction of the organic thickener proceeds by the action of titanium oxide having photocatalytic action and a compound that generates hydrogen peroxide in an aqueous solution. The effect may be reduced and the viscosity may be greatly reduced. For this reason, inorganic thickeners are preferred and used, more preferably inorganic clay minerals.

  On the other hand, in the conventional tooth bleaching, the bleaching treatment is mainly performed for each tooth, and a tooth bleaching material having a fluid viscosity that allows easy application and wiping of the bleaching material has been preferred and used. Recently, however, tooth bleaching methods such as a method of irradiating and bleaching a large number of teeth such as 6 teeth and 8 teeth at once, a method using a light irradiator with higher light intensity, etc. have been proposed, and high application to the tooth surface. And the retention property has been demanded.

There is a method to increase the viscosity by increasing the amount of thickener added in order to give high coatability and retention to the tooth surface, but in the case of inorganic clay minerals, the bleaching effect decreases due to the decrease in light transmittance In addition, problems such as poor adhesion to the tooth surface occur. There is a need for a bleaching method that can easily apply a sufficient amount of tooth bleaching material necessary for bleaching to the tooth surface without increasing the amount of inorganic clay mineral added, and has excellent retention and high bleaching effect. It was rare.
Japanese Patent No. 3030380 JP 2002-220330 A JP 2002-284656 A

  An object of the present invention is to provide a tooth surface by a simple operation in a bleaching treatment using a tooth bleaching material formed by combining a compound containing titanium oxide that generates photocatalysis by light irradiation and a compound that generates hydrogen peroxide in an aqueous solution. In addition, a sufficient amount of tooth bleaching material necessary for bleaching treatment can be easily applied and retained, sufficient bleaching effect can be obtained without deteriorating the original photocatalytic activity, and post-treatment operation is also easy. It is to provide a bleaching method.

  As a result of intensive research on the above-mentioned tooth bleaching method, the present inventors have developed a tooth bleaching material comprising a combination of a compound containing titanium oxide that produces a photocatalytic action by light irradiation and a compound that generates hydrogen peroxide in an aqueous solution. When applying to the tooth surface, by placing a water-absorbent sheet on the tooth surface, it is easy to wipe off for each tooth treatment, and even in a tooth bleaching material with fluid viscosity that is easy to handle even in a small container The present inventors have found that a tooth bleaching material can be applied and held by a simple operation and can exhibit sufficient bleaching power, and the present invention has been achieved.

That is, the present invention relates to the following (1) to (8).
(1) A tooth bleaching material comprising a combination of titanium oxide that produces photocatalytic action by light irradiation and a compound that generates hydrogen peroxide in an aqueous solution is soaked in a water-absorbent sheet and applied to the tooth surface. Tooth bleaching method.
(2) The tooth bleaching method according to the above (1), wherein an inorganic clay mineral is further combined with titanium oxide that generates photocatalysis upon irradiation with light and a compound that generates hydrogen peroxide in an aqueous solution.
(3) The above-mentioned (2), wherein titanium oxide that generates photocatalysis upon irradiation with light, a compound that generates hydrogen peroxide in an aqueous solution, and an inorganic clay mineral are further combined with phosphoric acid and / or condensed phosphate. The tooth bleaching method as described.
(4) The tooth bleaching method according to the above (1) to (3), wherein the material of the water absorbent sheet is paper, ceramics, natural fiber, chemical fiber or glass fiber.
(5) The tooth bleaching method according to the above (1) to (3), wherein the water-absorbent sheet is processed so that the shape thereof matches the tooth shape.
(6) The tooth bleaching method according to (1) to (3), wherein the water-absorbent sheet is processed so that the shape of the water-absorbent sheet covers one or more teeth.
(7) The tooth bleaching method according to the above (1) to (3), wherein the viscosity of the tooth bleaching material is 2.0 Pa · s or less.
(8) A tooth bleaching material comprising a combination of titanium oxide that generates a photocatalytic action by light irradiation and a compound that generates hydrogen peroxide in an aqueous solution, a water absorbent sheet for impregnating the tooth bleaching material, and a light irradiation device A combination of tooth bleaching system.

  According to the tooth bleaching method of the present invention, a sufficient amount of tooth bleaching material necessary for the bleaching treatment can be easily applied and retained on the tooth surface, and sufficient bleaching effect can be achieved without reducing the original photocatalytic activity. Is obtained.

  Hereinafter, the present invention will be described in more detail. As the titanium oxide used in the present invention, any compound can be used regardless of its form and properties as long as it is a compound containing titanium oxide that generates a photocatalytic action. Preferred is a crystalline titanium oxide of any one of anatase type, rutile type and brookite type, and rutile type titanium oxide is particularly preferred. Further, it is also possible to use an anatase type, rutile type or brookite type titanium oxide whose surface has improved affinity with the tooth surface by coating with calcium phosphate. Further, the photocatalytic activity is improved by supporting a metal such as platinum on titanium oxide, or the titanium oxide is responsive to light in the visible light region by plasma treatment, N-containing material or S-containing material. Those having a photocatalytic action can also be used.

  The titanium oxide may be in a powder state or a sol state dispersed in a medium such as water. The particle size of the compound containing titanium oxide is preferably 1 to 500 nm, more preferably 5 to 200 nm. The effect is sufficiently obtained even if the amount of titanium oxide is small, specifically 0.001 to 10% by weight, preferably 0.01 to 1% by weight, more preferably 0.01 to 0%. .1% by weight. If the blending amount is too small, it may take a long time to obtain a favorable result depending on the degree of discoloration of the teeth, and if it is too large, the light transmittance of the compound itself containing titanium oxide is not good. Decrease may occur.

  The compound that generates hydrogen peroxide in the aqueous solution used in the present invention may be any compound that can generate hydrogen peroxide when made into an aqueous solution, such as hydrogen peroxide, perborate, percarbonate, superphosphorus. Acid salts, persulfates, calcium peroxide, magnesium peroxide, urea peroxide and the like can be mentioned, and hydrogen peroxide is preferred.

  In the tooth bleaching material of the present invention, the compound that generates hydrogen peroxide can obtain a remarkable bleaching effect at a sufficiently low concentration as compared with a conventionally used bleaching material. That is, the content of the compound that generates hydrogen peroxide in the aqueous solution is 35% by weight or less, preferably 1 to 10% by weight. Even if the content is higher than this range, there is no significant difference in the bleaching effect, and it is not advantageous from the viewpoint of safety.

  Examples of the inorganic clay mineral used in the present invention include talc, pyrophyllite, saponite, hectorite, soconite, stevensite, swinholderite, montmorillonite, beidellite, nontronite, bolconscoteite, vermiculite, phlogopite, iron Mica, muscovite, sericite, illite, sea green stone, clintnite, clinochlore, chamosite, antigolite, lizardite, chrysotile, kaolinite, dickite, naclite, halloysite, metahalosite, anoxite, sepiolite, imogolite , Allophane, sea chlorite-montmorillonite, rholite-montmorillonite, chlorite-vermiculite, illite-montmorillonite, halloysite-montmorillonite, kaolinite-montmorillonite, etc. Used.

  Among the above inorganic clay minerals, a lamellar structure type clay mineral such as talc, montmorillonite, saconite, stevensite, beidellite, nontronite, saponite, hectorite, vermiculite and kaolinite is more preferably used in the present invention. This is because the layered structure type inorganic clay mineral has the property of being easily swollen by incorporating water molecules between unit layers in the structure. These inorganic clay minerals may be natural products or synthetic products. Synthetic products include synthetic sodium magnesium silicate lithium (Laponite) and the like. A mixture of two or more of these can also be used. In addition, the compounding quantity of these inorganic clay minerals becomes like this. Preferably it is 0.1 to 10 weight%, More preferably, it is 0.5 to 5 weight%.

  The viscosity of the tooth bleaching material used in the present invention is 2 Pa · s or less, preferably 0.001 to 2 Pa · s, more preferably 0.001 to 1 Pa · s. If the viscosity is within these ranges, the absorption to the water-absorbent sheet is good and the application to the tooth surface is easy, the adhesiveness of the water-absorbent sheet containing the tooth bleaching material to the teeth is good, and the bleaching material Will not sag.

  The present invention is also applicable to tooth bleaching materials containing phosphoric acid and condensed phosphate used as stabilizers and bleach accelerators. As phosphoric acid, orthophosphoric acid is preferable. Examples of the condensed phosphate include potassium phosphate such as pyrophosphoric acid and tripolyphosphoric acid which are condensed phosphoric acid, sodium salt, etc., preferably tetrasodium pyrophosphate. In addition, the tooth bleaching material used in the present invention may contain a fragrance, a dye, a sensitizer, a solvent and the like in addition to the aforementioned components.

  The water-absorbent sheet used in the present invention is not particularly limited, but materials such as paper, ceramics, natural fibers, chemical fibers, and glass fibers are preferably used, and these fibers are woven and fused. Nonwoven fabrics obtained by attaching and / or adhering and bonding are used. And preferably, a water-absorbent sheet having high light transmittance is used. Further, the shape of the water-absorbent sheet is not particularly limited, but it is preferably a shape that can be easily subjected to bleaching treatment, such as one that has been processed to match the shape of the tooth, one that has been processed so as to cover one or more teeth. used. Specifically, (1) a rectangle covering one tooth, (2) a cut into a tooth shape covering one tooth, (3) a rectangle covering a plurality of teeth, (4) covering a plurality of teeth However, there is a case where only the gingival part is cut so that the bleaching material does not adhere to the gingival part, and (5) a part cut into a tooth mold covering a plurality of teeth.

  The method for impregnating the tooth bleaching material in the water-absorbent sheet according to the present invention is not particularly limited, but the method for impregnating the tooth bleaching material after the water-absorbing sheet is set on the tooth in advance, and the tooth bleaching material in advance There is a method of setting the water absorbent sheet on the teeth.

  The tooth bleaching material of the present invention is used by repeating the treatment of irradiating light one or more times, preferably a plurality of times after being applied using a water absorbent sheet. The light to be irradiated is preferably light having a wavelength that can be absorbed by titanium oxide and cause photocatalytic action, and has a wavelength that has little adverse effect on the human body. As such a wavelength, light including a wavelength of 300 nm or more, more preferably light including a wavelength of 380 or more is used. Examples of the light source used in the present invention include exothermic lamps, fluorescent lamps, halogen lamps, black lights, metal halide lamps, xenon lamps, mercury lamps, UV lamps, LEDs (light emitting diodes), and semiconductor lasers. Unnecessary wavelengths of the light from these light sources may be cut through an appropriate filter.

  The frequency | count of application | coating of the tooth bleaching material of this invention and light irradiation can be suitably adjusted according to the grade of the discoloration degree of a tooth. The tooth bleaching material of the present invention is effective for bleaching both unmyelinated and myelinated teeth, and exhibits a remarkable effect in bleaching those teeth safely and simply.

  According to a preferred embodiment of the present invention, a tooth bleaching material comprising a combination of a compound containing titanium oxide that generates a photocatalytic action by light irradiation and a compound that generates hydrogen peroxide in an aqueous solution can be easily provided in a sufficient amount necessary for the bleaching treatment. The tooth bleaching material can be sufficiently retained by the water-absorbent sheet even when light is irradiated for a long time using a high-intensity light irradiator. Further, when treating one by one, the bleaching treatment can be easily performed in any case where a large number of teeth are treated at once.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention does not receive a restriction | limiting at all to a following example. The applicability and retainability on the tooth surface were examined by (1) an applicability test on the tooth and (2) an retainability test on the tooth surface.

Examples 1-4
Using each manufacturer's water-absorbent sheet, (1) a test for applicability to teeth and (2) a test for retention on the tooth surface were performed.
<Applicability test on teeth>
1) The water-absorbent sheet was cut into a 1 cm × 1 cm square.
2) A tooth bleaching material having a total amount of 100 g was prepared by adding purified water to 0.06 g of titanium oxide, 10.00 g of 35 wt% hydrogen peroxide and 1.50 g of laponite (inorganic clay mineral).
3) Place the water absorbent sheet (1 cm × 1 cm) prepared in 1) on the extracted tooth (maxillary anterior tooth),
The tooth bleaching material prepared in 2) was applied with a dropper.
4) The maximum application amount without dripping was examined even when the extracted tooth was vertical (90 degrees from the horizontal).
The results are summarized in Table 1.

<Retention test on tooth surface>
1) The water-absorbent sheet was cut into a 1 cm × 1 cm square.
2) A tooth bleaching material having a total amount of 100 g was prepared by adding purified water to 0.06 g of titanium oxide, 10.00 g of 35 wt% hydrogen peroxide and 1.50 g of laponite (inorganic clay mineral).
3) Place the water absorbent sheet (1 cm × 1 cm) prepared in 1) on the extracted tooth (maxillary anterior tooth),
The tooth bleaching material prepared in 2) was applied with a dropper.
4) After applying the maximum amount of tooth bleaching material without dripping even when the extracted tooth was vertical (90 degrees from the horizontal), it was irradiated with light by a dental light irradiator Hyperlightel (manufactured by Kuraray Medical) for 5 minutes.
5) The amount of decrease in the applied tooth bleaching material after the end of light irradiation was examined.
The results are summarized in Table 1.

Comparative Example 1
Without using a water-absorbent sheet, (1) an applicability test on a tooth and (2) a retention test on a tooth surface were performed.

Claims (8)

  A tooth bleaching method characterized in that a tooth bleaching material comprising a combination of titanium oxide that generates photocatalytic action by light irradiation and a compound that generates hydrogen peroxide in an aqueous solution is impregnated into a water absorbent sheet and applied to the tooth surface. .   The tooth bleaching method according to claim 1, wherein an inorganic clay mineral is further combined with titanium oxide that generates photocatalysis upon irradiation with light and a compound that generates hydrogen peroxide in an aqueous solution.   3. Teeth bleaching according to claim 2, characterized in that phosphoric acid and / or condensed phosphate is further combined with titanium oxide that generates photocatalysis upon irradiation with light, a compound that generates hydrogen peroxide in an aqueous solution, and an inorganic clay mineral. Method.   The tooth bleaching method according to claim 1, wherein a material of the water absorbent sheet is paper, ceramics, natural fiber, chemical fiber, or glass fiber.   The tooth bleaching method according to claim 1, wherein the water absorbent sheet is processed so that the shape of the water absorbent sheet matches the shape of the tooth.   The tooth bleaching method of Claims 1-3 processed so that the shape of a water absorbing sheet may cover one or several teeth.   The tooth bleaching method according to claim 1, wherein the tooth bleaching material has a viscosity of 2.0 Pa · s or less.   A combination of a tooth bleaching material comprising a combination of titanium oxide that produces photocatalytic action by light irradiation and a compound that generates hydrogen peroxide in an aqueous solution, a water absorbent sheet for impregnating the tooth bleaching material, and a light irradiation device Tooth bleaching system.