JP2006061292A - Tooth bleaching method and plaque controlling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tooth bleaching method which can be executed by a person who likes to whiten the teeth at home without going to a dentist and is more convenient and excellent in safety while having the same bleaching effect of the office bleach, and a plaque controlling method which can prevent a decayed tooth and a periodontal disease. <P>SOLUTION: A distinctive feature of the tooth bleaching method and the plaque controlling method is brushing the surfaces of the teeth while the light is emitted from a dentifrice containing titanium dioxide which generates a photocatalytic action by the radiation of light and a compound which can generate hydrogen peroxide placed on a tooth brush having a light emitting function. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for bleaching and removing pigments deposited on teeth and a plaque control method. More specifically, a toothpaste having a specific composition having photocatalytic activity is applied to a toothbrush having a light irradiation function, and the discolored tooth is brushed by bleaching and removing the pigment deposited on the tooth. The present invention relates to a method and a plaque control method.

  In recent years, in dental practice, there has been an increasing demand for improvement of so-called aesthetics such as tooth shape, arrangement, and harmony. In addition, as an important cosmetic factor, there are many requests for whitening teeth, and teeth are bleached in dental practice. This is so-called office bleach. The inventors have also developed a bleaching material used for office bleaching (see Patent Documents 1 and 2).

  Some bleaching materials are already used in office bleach, such as Matsukaze Highlights (trade name). Whether it is Matsukaze Highlight or Patent Documents 1 and 2, a bleaching material containing a photocatalyst is applied to the tooth on which the pigment is deposited, and the pigment is decomposed by irradiating light with a light irradiator. It is necessary to repeat the application of the bleaching material and the light irradiation several times until the teeth have the desired whiteness. However, since office bleaching involves repeated application of bleaching material and light irradiation, there is a heavy burden on those who receive treatment, such as time constraints and regular visits, and improvements are desired.

As a method for preventing tooth decay and periodontal disease, there are plaque control methods such as brushing and periodic calculus removal. On the other hand, it is also true that many people still have tooth decay and periodontal disease. If the reproduction can be suppressed by sterilizing gram-positive bacteria in the oral cavity that cause dental caries and periodontal disease, the onset of these can be prevented. However, from the viewpoint of safety, sterilization in the oral cavity is not easy, and there is no effective means.
JP 2002-220330 A JP 2002-284656 A

  As mentioned above, since office bleaching requires specialized techniques such as gingival protection for tooth bleaching, it is necessary to visit a dentist, and since the application of bleaching material and light irradiation are repeated, time constraints are imposed. There is a need for a simpler tooth bleaching method that places a heavy burden on those who receive treatment, such as the need for regular visits. In addition, it is not easy to sterilize the oral cavity to prevent tooth decay and periodontal disease.

  The present invention solves such problems, and it is possible to carry out at home without requiring a person who wants to whiten teeth to go to a dentist, which is more convenient and safer with the same bleaching effect as office bleaching. It is another object of the present invention to provide a bleaching method and a plaque control method capable of preventing tooth decay and periodontal disease at the same time.

  The inventors of the present invention have conducted extensive research on a tooth bleaching method and a plaque control method that have a high tooth bleaching effect and that can be carried out at home and that are simple and excellent in safety. Tooth bleaching and plaque control can be achieved by applying a dentifrice containing the resulting titanium dioxide and a compound capable of generating hydrogen peroxide to a toothbrush having a light irradiation function, and brushing the tooth surface while irradiating light. And found the present invention.

That is, the present invention relates to the following.
(1) To apply a dentifrice containing titanium dioxide that generates photocatalytic action by light radiation and a compound capable of generating hydrogen peroxide to a toothbrush having a light irradiation function, and brushing the tooth surface while irradiating light. A feature of bleaching teeth.
(2) Applying a dentifrice containing titanium dioxide that produces photocatalytic action by light radiation and a compound capable of generating hydrogen peroxide to a toothbrush having a light irradiation function, and brushing the tooth surface while irradiating light Characteristic plaque control method.

  According to the tooth bleaching method and the plaque control method of the present invention, (1) without being constrained by a visit to a dentist, the toothbrushing in daily life, (2) safely, (3) the tooth Bleaching is possible and (4) plaque control is also possible.

  In order to achieve the above-mentioned object, in the present invention, a dentifrice comprising a titanium dioxide that generates a photocatalytic action by light irradiation or a mixture containing the same and a compound capable of generating hydrogen peroxide or a mixture containing the same is provided. Use. These are mixed immediately before use, or each is attached to a toothbrush having a light irradiation function alone, and the tooth surface is brushed while irradiating light. As a result, teeth can be whitened in daily tooth brushing, and plaque control can be performed.

  The main action used in the present invention is a bleaching action and a plaque control action due to a synergistic effect of titanium dioxide as a photocatalyst and hydrogen peroxide or hydrogen peroxide generated from a compound. That is, when light is irradiated onto titanium dioxide as a photocatalyst, electrons and holes are generated, which react with hydrogen peroxide to generate active oxygen. This active oxygen has a much stronger oxidizing power than ozone, can oxidize and decompose almost all organic substances to carbon dioxide gas, and is effective in sterilizing gram-positive bacteria in the oral cavity.

  The first component of the dentifrice, titanium dioxide, may be used alone or as a mixture containing it. When used alone, it is a powder, but in the case of a mixture, it may be a powdery mixture or a sol state dispersed in a medium such as water. Titanium dioxide can have various crystal structures, but anatase type, rutile type or brookite type having photocatalytic activity is used in the present invention.

  The particle system of titanium dioxide is preferably 1 to 500 nm, more preferably 5 to 200 nm. If the amount of titanium dioxide is too small, it may take a long time to obtain a desirable tooth bleaching effect. On the other hand, if the amount is too large, the light transmittance of titanium dioxide itself is not good. The effect and the plaque control effect may be reduced. Therefore, the concentration of titanium dioxide after mixing titanium dioxide or a mixture containing it with a compound capable of generating hydrogen peroxide or a mixture containing the same is preferably 0.001 to 10% by weight, More preferably, it is 0.01 to 1 weight%, More preferably, it is 0.01 to 0.5 weight%.

  In addition, since titanium dioxide is insoluble in water, it is effective to add an inorganic thickener when it is intended to be uniformly dispersed in water. As the inorganic thickener, it is preferable to use a layered structure type inorganic clay mineral having a property of expanding in the presence of water. Examples of the layered structure type inorganic clay mineral that can be preferably used in the present invention include saponite, montmorillonite, stevennite, hectorite, smectite, nectite, and sepiolaoto. These may be natural products or synthetic products. Moreover, 1 type may be used and 2 or more types may be used. The blending amount thereof is preferably 0.1 to 10% by weight after mixing titanium dioxide or a mixture containing it with a compound capable of generating hydrogen peroxide or a mixture containing the same. Preferably it is 0.5 to 5 weight%.

  The second component, hydrogen peroxide, may be a hydrogen peroxide solution or a compound capable of generating hydrogen peroxide by reacting with water. For example, hydrogen peroxide, perborate, percarbonate, persulfate, perphosphate, calcium peroxide, magnesium peroxide, urea peroxide and the like can be mentioned.

  The hydrogen peroxide solution is a liquid and can be used alone as it is, but an organic thickener can be added for easy handling. Organic thickeners that can be preferably used include sodium polyacrylate, methylcellulose and sodium carboxymethylcellulose. 1 type may be used and 2 or more types may be used. The blending amount of the thickener is preferably 0.1 to 10% by weight after mixing the titanium dioxide or the mixture containing it with the compound capable of generating hydrogen peroxide or the mixture containing the same. Preferably it is 0.1 to 5 weight%.

  Perborate, percarbonate, persulfate, perphosphate, calcium peroxide, magnesium peroxide and urea peroxide are powders and can be used as they are. 1 type may be used and 2 or more types may be used. Since these undergo a decomposition reaction when they come into contact with water, they are preferably not stored in a liquid form, but rather stored as a powder and mixed immediately before brushing.

  A surfactant can be added to the dentifrice in order to improve adhesion to the teeth during brushing. As the surfactant, an anionic surfactant, a cationic surfactant, a nonionic surfactant, and a zwitterionic surfactant can be blended.

  When brushing a toothpaste that has a light irradiation function using a toothpaste that is a mixture of titanium dioxide that generates photocatalysis by light irradiation or a mixture containing the same and a compound capable of generating hydrogen peroxide or a mixture containing the same. In order to reduce irritation in the oral cavity, the amount of generated hydrogen peroxide is preferably 3% or less in terms of effective oxygen concentration.

  Any structure and principle of the toothbrush having a photocatalytic function can be used, but a halogen lamp, LED (light emitting diode), semiconductor laser, or the like can be preferably used as a light source. The wavelength of the irradiated light is light having a wavelength that can be absorbed by titanium dioxide and can cause photocatalysis, and light that does not adversely affect the human body is preferable. Light that includes visible light, particularly light that has a wavelength of 380 to 500 nm. Are preferably used.

  Next, the present invention will be described more specifically with reference to examples and comparative examples. However. The present invention is not limited to the following examples.

Example 1
Purified water was added to 0.05 g of titanium dioxide and 3.00 g of synthetic hectorite to make the total amount 100 g (mixture 1). Further, purified water was added to 5.00 g of 35% hydrogen peroxide water and 0.3 g of sodium polyacrylate to make the total amount 100 g (mixture 2). After mixing the same amount of the mixture 1 and the mixture 2 and immersing the brush part of a toothbrush having a light irradiation function (including light having a wavelength of 400 to 500 nm) using a halogen lamp as a light source, and adhering the mixture, The extracted teeth of the cow were brushed for 5 minutes while irradiating with light, and then rinsed with water. Brushing with the mixture and rinsing with water were repeated 50 times. Plaque control action was observed with a 5-grade evaluation based on the degree of color change and staining method.

Comparative Example 1
Except not irradiating light, it carried out like Example 1.

Comparative Example 2
It carried out similarly to Example 1 on the conditions which use a commercially available dentifrice and do not irradiate light. The results are shown in Table 1.

The classification of the degree of discoloration in the bleaching test was as follows.
F1: The whole crown is uniformly colored with pale yellow, brown and gray, and no stripe pattern is seen.
F2: Darker than F1, the entire crown is uniformly colored, and no striped pattern is observed.
F3: Dark gray, bluish gray with stripes.
F4: Extremely dark purple, grayish purple and the entire crown is discolored.

Claims (14)

  It is characterized in that a toothpaste containing a titanium dioxide that generates photocatalytic action by light radiation and a compound capable of generating hydrogen peroxide is attached to a toothbrush having a light irradiation function, and the tooth surface is brushed while irradiating light. Tooth bleaching method.   The method for bleaching teeth according to claim 1, wherein the titanium dioxide is anatase type, rutile type or brookite type.   The method for bleaching teeth according to claim 1, wherein the titanium dioxide that produces a photocatalytic action by light irradiation contains an inorganic thickener.   The tooth bleaching method according to claim 1, wherein the compound capable of generating hydrogen peroxide contains an organic thickener.   The compound capable of generating hydrogen peroxide is at least one compound selected from the group consisting of hydrogen peroxide, perborate, percarbonate, perphosphate, calcium peroxide, magnesium peroxide, and urea peroxide. The method for bleaching teeth according to claim 1.   The tooth bleaching method according to claim 1, wherein the effective oxygen concentration after mixing titanium oxide and a compound capable of generating hydrogen peroxide to produce a photocatalytic action by light irradiation is 3% or less.   The tooth bleaching method according to claim 1, wherein the wavelength of light emitted from a toothbrush having a light irradiation function includes 380 to 500 nm.   It is characterized in that a toothpaste containing a titanium dioxide that generates photocatalytic action by light radiation and a compound capable of generating hydrogen peroxide is attached to a toothbrush having a light irradiation function, and the tooth surface is brushed while irradiating light. Plaque control method.   The plaque control method according to claim 8, wherein the titanium dioxide is anatase type, rutile type or brookite type.   The plaque control method according to claim 8, wherein the titanium dioxide that produces a photocatalytic action by light irradiation contains an inorganic thickener.   9. The plaque control method according to claim 8, wherein the compound capable of generating hydrogen peroxide contains an organic thickener.   The compound capable of generating hydrogen peroxide is at least one compound selected from the group consisting of hydrogen peroxide, perborate, percarbonate, perphosphate, calcium peroxide, magnesium peroxide, and urea peroxide. The plaque control method according to claim 8.   The plaque control method according to any one of claims 8 to 12, wherein the effective oxygen concentration after mixing titanium dioxide that produces photocatalytic action by light irradiation and a compound capable of generating hydrogen peroxide is 3% or less.   The plaque control method according to claim 8, wherein the wavelength of light emitted from the toothbrush having a light irradiation function includes 380 to 500 nm.