JPH0217108A - Dental coating composition - Google Patents

Abstract

PURPOSE:To provide the composition having a highly stable quality and capable of coloring teeth into various colors by adding an inorganic pigment surface- treated with a wax and/or hydrocarbon having a specific melting point or more to a volatile solvent solution of a resin having a water-resistant coating film forming ability. CONSTITUTION:An inorganic pigment (especially preferably a combination of titanium dioxide and iron oxide) surface-treated with a wax and/or hydrocarbon (especially preferably hard carnauba wax having a relatively high melting point) having a melting point of >=30 deg.C to a volatile solvent (e.g. ethanol, ethyl acetate, butyl acetate or acetone) solution of a resin [e.g. shellac, cellulose derivative or (meth)acrylic resin] having a water-resistant coating film forming ability to provide a dental coating composition. It is preferable that the viscosity of the solution is <=1,000 poise at 20 deg.C and the surface of the inorganic pigment is treated with the wax and/or hydrocarbon in an amount of 1-30wt.% based on the whole amount of the inorganic pigment.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to novel dental coating compositions whose color can be changed at will.

Conventional techniques and issues Coloring of tooth tissue is caused by caries, food, drugs, smoking, injury, genetics,
It occurs frequently due to a wide range of causes including metabolic abnormalities.

Conventionally, methods for removing such colored teeth by polishing them with toothpaste, bleaching the tooth substance from the pulp with peroxide, pasting a porcelain plate on the tooth surface, etc.
Methods such as filling with composite resin have been attempted. However, toothpaste only removes stains on the surface of the teeth, but cannot remove the coloring within the tooth structure, and methods using peroxide, porcelain plates, or composite resins require treatment such as scraping the teeth. Therefore, there are problems such as it is inappropriate for healthy teeth that have no problems other than staining, and the treatment is time-consuming and expensive, placing a heavy burden on the patient.

Therefore, in recent years, coating materials that can easily change the tooth color have been used, but these materials avoid dissolving nitrocellulose or acrylic resin in an acetate-based solvent to avoid dispersing the a-material. Therefore, during long-term storage, the pigment tends to settle and solidify the face t1 (solidity is a guarantee of product quality).

In general, in order to maintain the dispersibility of pigments for a long period of time, methods such as increasing the viscosity of the system or adding an anti-settling agent and L agent can be considered, but if the viscosity is high, Furthermore, when anti-sedimentation additives are added, the gloss of the ruptured membrane tends to disappear.However, when these methods are used,
The sedimentation speed of the pigment is delayed (1') and cannot be completely prevented, and the problem is that the pigment settles and becomes 1M during the length 1υ1 maintenance rf (f). -Live.

Therefore, there is a need for a coating composition that allows for the +1 dispersion of the pigment, allowing the pigment to settle and then redispersing the pigment during use by shaking.

First Step to Solve the Problems Prior to the present invention, as a result of repeated desilvering research in view of the problems listed in item 11, an inorganic pigment that had been subjected to a specified surface treatment was blended into a certain kind of resin solution. The solution does not have the above-mentioned drawbacks, has excellent redispersibility during use, is uniform, and has a uniform color control of slave units.
They discovered that scales form a pattern of scales, and completed the present invention.

That is, the present invention includes an inorganic pigment surface-treated with a wax and/or hydrocarbons having a melting point of 30° C. or higher in a volatile solvent solution of a resin having a water resistance P1: pattern-forming ability fj'. We present a dental coating composition characterized in that it is made by blending (J (4゛Rurano)).

According to the dental coating composition of the present invention, even after long-term storage, the pigment can be easily and uniformly dispersed by simply shaking the composition slightly immediately before use.
It can be applied to the tooth surface in the same manner as before, and a corrugated film with a uniform and desired color tone can be formed on the tooth surface.

The resin used in the present invention can be used to form a water-resistant film by volatilizing the volatile solvent in the coating composition. ester, water i (I
Natural resins such as non-carbon and their V4R forms, cellulose derivatives such as nitrocellulose, acedelcellulose, ethylcellulose, methylcellulose, and acetylbutylcellulose, (meth)acrylic resins, fujyl resins, vinyl resins, alkyd resins, , synthetic resin such as Bokino resin alone seems to be 28! Combinations of the above may be mentioned. Among these, shellac, cellulose derivatives and (meth)acrylic resins are preferred from the viewpoint of water resistance and safety, and (meth)acrylic resins are particularly preferred.

Examples of volatile solvents used include n-hexane, 7
0 Hydrocarbons such as hexane, benzene, toluene, xylene, alcohols such as ethanol, isopropanol, n-propanol, butanol, acetone, noedyl ketone, ethyl butyl ketone, methyl butyl ketone, methyl butyl ketone, methyl propyl ketone Ketones such as methyl formate, ethyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, amyl acetate and other esters may be used alone or in combinations of 2 and 1. Among these, ethanol, ethyl acetate,
Butyl acetate and acetone are preferred from the viewpoint of safety, and ethanol is particularly preferred.

In the dental coating composition of the present invention, the resin having the ability to form a water-resistant corrugated film is dissolved in a solvent. The viscosity of the solution is 100 at 20°C.
It is less than 0 centivoise (hereinafter referred to as cp and approximately 4'), preferably 10 to 500 cp and 4'. When the viscosity exceeds 1000 cp, the ρI dispersion of the pigment during use becomes difficult.

The waxes and/or hydrocarbons used have a melting point of 30° C. or higher, such as spermaceti wax, beeswax, shellac, lanolin, wood wax, carnauba wax, candelilla wax, montan wax, rice wax, petrolatum, Lli's unique combinations include paraffin, ceresin, microcrystalline wax, and the like. In particular, it is preferable to use carnauba wax, which has a relatively high melting point and is hard.

Inorganic pigments used include, for example, titanium oxide, zinc sulfide, zinc sac, lithopone, white M materials such as andymon white, calcium carbonate, silicic acid, pallite, barium dioxide, clay, talc, diatom, bentonite, and magnesila carbonate 12. Extender pigments such as carbon black, iron oxide, lead zinc oxide, silicon carbide, red lead, cadmium red, yellow lead, titanium yellow, barium yellow, strondium yellow, cobalt green, chrome green, pyrinoan navy blue, ultramarine, cobalt blue, etc. Examples of individual ff color pigments include a combination of two or more. Among these, titanium oxide and iron oxide are preferably used in combination because they are highly safe and have the ability to tone to a color tone close to tooth color. Furthermore, these pigments are tar-based rrJil
It can also be used in conjunction with one-color wood.

Furthermore, the dental coating composition of the present invention may optionally contain a plasticizer, a surfactant, a dispersant, an antistatic agent,
Ultraviolet absorbers and the like may be added as appropriate within a range that does not violate 9)J and 10) of the present invention.

The dental coating agent of the present invention can be manufactured by a known method. For example, the above-mentioned wax and
/or after dissolving the hydrocarbons, adding the pigment,
The molecules are uniformly kneaded and dispersed in a solution using a conventional 11 machine, such as a three-roll mill, Sudir mill, ball mill, Sandmill, Attritor, and Sassmeyer mill.

Then, after removing the solvent using an evaporator or the like,
A surface-treated inorganic pigment is obtained by pulverizing with a pulverizer such as an atomizer or a ball mill. In this way, the particle size of the smoothed surface-treated pigment is not particularly limited, but it is added to the solvent solution of the resin that reduces the ability to form a water-resistant film,
The dental coating composition of the present invention is prepared by uniformly mixing and dispersing the ingredients in a solution using a conventional mixer such as a day silver, a medium mixer propeller stirrer, or a ball mill.

The amount of wax and/or hydrocarbons used for surface treatment of inorganic pigments is 1 to 30% by weight based on the total amount of inorganic pigments.
, preferably 3 to 20% by weight. When the blended layer is less than 1% by weight, the effect of 11j dispersibility during use can be sufficiently obtained. When the amount is more than m%, it becomes difficult to micronize the surface-treated inorganic pigment, and the strength of the formed film also decreases.

The surface-treated inorganic pigment thus obtained is blended in an amount of 0.45 to 30% by weight based on the total weight of the composition. If the blending amount is less than 0.5+21%, sufficient hiding power will not be obtained and the tooth color will not be able to be adjusted to the desired color tone by 4 degrees. On the other hand, if the amount is more than 30%, the strength of the formed film will be low.

To use the composition of the present invention, first wipe the tooth surface thoroughly with gauze or the like and dry it, then apply the composition in which the pigment has been redispersed to the tooth using a brush or the like. Apply evenly to the surface.

EXAMPLES Next, the present invention will be explained in more detail with reference to Examples, Comparative Examples, and Test Examples, but the present invention is not limited thereto.

Example 1 Prescription components mm% (meth)acrylic resin 9.6 Titanium oxide 38 Carnauba wax 02 Ethanol
After dissolving 86.4 carnauba wax in 7Cl form, titanium oxide was added and stirred with a mechanical stirrer. Next, Ri [I
The Cl horno was removed by air drying and further dried at 60°C for 1 hour.The surface treated inorganic pigment was added to a euthanol solution of (meth)acrylic resin and kneaded in a ball mill for 21 hours to form a dental coating. A composition of 1111 was prepared.

Example 2 Prescription ingredients 1% (meth)acrylic resin 18.1 Titanium oxide 7.6 Yellow iron oxide 0.1 Carnauba wax 0°4 Ethanol
63.8iso-Property Tools
Example 1 with a prescription of 10.0 or more
Dental coating compositions 1 and q were prepared in the same manner as above.

Example 3 Characteristic U Ingredient m1% Shellac 21 B Titanium oxide 7.4 Yellow iron oxide
0.6 black iron oxide
0.2 Carnauba cl”I
O,5 ethanol
652 acetone
A dental coating composition was prepared in the same manner as in Example 1 using the above formulation.

Example 4 10,000 Components Ethyl cellulose Titanium oxide Carnauba wax Candelilla wax Weight % 6.2 0.3 0.3 Ethyl acetate 86.9 A dental coating composition R was prepared in the same manner as in Example 1 using the above formulation.

Example 5 Prescription ingredients Weight % Shellac 153 (meth)acrylic resin 34 titanium oxide 236I carnauba a 0.6 paraffin
1.2 ethanol
A dental coating composition was prepared in the same manner as in Example 1 using the above formulation.

Example 6 Prescription ingredients 0% Ethyl cellulose 3.0 Titanium oxide 0.5 Candelilla wax 0.1 Ethyl acetate
38.2 Butyl acetate
A dental coating composition was prepared in the same manner as in Example 1 using the above formulation.

Comparative example 1 Prescription.

Ingredients Weight% (meth)acrylic resin 9.6 Titanium oxide 4,0 Ethanol 86.4 Titanium oxide was added to the ethanol solution of (meth)acrylic resin and kneaded for 24 hours in a ball mill to prepare a dental coating composition. did.

Comparative Example 2 Shun π Ingredients Ethyl cellulose titanium oxide ethyl acetate butyl acetate! 1 m% 3.0 0.6 38.2 A dental coating composition was prepared in the same manner as in Comparative Example 1 using the above formulation.

Comparative Example 3 Prescription Ingredients Shield! n% shellac 218 titane oxide 7.8 yellow iron oxide
0.7 black iron oxide
0.2 ethanol
652 acetone
4.3 Comparative Dental coating composition III was prepared in the same manner as Fp41.

The viscosity and redispersibility of the thus obtained dental coating compositions of Examples 1 to 6 and Comparatives P11 to 3 during use were investigated. The viscosity was measured at 20℃ using an E-type meter.
The redispersibility during use was measured at 30°C at 40°C.
After being left for a day, the samples were shaken by hand a specified number of times and visually evaluated. The results are shown in Table 1.

Table 1 As is clear from Table 1, the coating composition of the present invention is more recyclable during use than the compositions of Comparative Examples 1 to 3, which are conventional coating compositions containing inorganic pigments without surface treatment. It has excellent dispersibility and can form a uniform film with any color tone on the tooth surface after long-term storage.

Examples 7 to 10 and Comparative Examples 4 to 6 Various waxes/
A dental coating composition with an inorganic pigment ratio was prepared.

Prescription ingredients 1% (meth)acrylic resin 9,6 titanium oxide 3.8 carnauba wax Ethanol listed in Table 2
The viscosity and redispersibility during use of the dental coating composition thus obtained were determined to be the same as above, and the coating strength was measured by a pencil scratch test according to the JIS method. The results are shown in Table 2.

Table 2 As is clear from Table 2, when the amount of wax is in the range of I to 30% by weight based on the total weight of the inorganic pigment, it has sufficient film strength and is redispersed after long-term storage. An excellent dental coating composition with good properties can be obtained. On the other hand, if the amount of wax blended is less than 1% by weight based on the total weight of the inorganic pigment, the surface treatment effect of the inorganic pigment will not be sufficiently obtained, and the redispersibility during use after long-term storage will deteriorate. If the blending amount is more than 30% by weight based on the total weight of the inorganic pigment, redispersibility during use will be good, but sufficient film strength will not be obtained.

Examples It to 18 and Comparative Examples 7 to 8 Dental coating compositions containing various amounts of carnauba wax surface-treated inorganic pigments were prepared according to the above-mentioned preparation method according to the following formulations, 11. The viscosity, film strength, ILG dispersibility, and hiding power of the prepared compositions were measured.

Mosquito-π Component Physical loss % (meth)acrylic resin IO carnauba wax surface treatment inorganic pigment* [Titanium oxide/yellow iron oxide/black iron oxide (95,5:4:0.5v/v)] Listed in Table 3 Ethanol 100 Adjust to *
Surface treatment viscosity, film strength and redispersibility were measured in the same manner as above using 5.6% carnauba wax based on the total weight of the pigment.

The dental coating composition with adjusted hiding power is applied to a transparent film.
lF! After coating, the back side was covered with black ketone paper, and the difference in brightness from that when no coating was applied was measured using a colorimeter, and evaluation was made according to the following procedure.

(Ω)・Difference in brightness is 20 or more 1゜○: Difference in brightness is 10 to 20 ×, difference in brightness is 10 or more If the amount of inorganic pigment blended is less than 0.65% by weight and the hiding power is insufficient, it becomes impossible to coat the teeth with the desired tooth color.On the other hand, if the amount is more than 30% by weight, the coating strength decreases and is not practical. I can't stand it anymore.

Examples 19 to 22 and Comparative Example 9 What are the hardness and viscosity shown below? Dental/I+ coating composition was prepared by adding 0.5 g of titanium oxide surface-treated with 5 weight 1% carnauba wax based on the total amount of inorganic pigment (titanium oxide) to the acetic acid solution of ethylcellulose. was prepared. Next, the composition was allowed to stand at 10°C for 30 minutes to avoid sedimentation of the pigment, and then mixed by hand for 30 minutes.
The mixture was shaken for 0 seconds, and the dispersibility of the pigment was evaluated by visual inspection according to II.

06 Good dispersibility △: Slightly difficult to disperse ×: Not dispersed The results are shown in Table 4.

Table 4 As is clear from Table 4, when the viscosity of the ethyl acetate solution of ethylcellulose is higher than 1000 cp, it becomes difficult to redisperse the precipitated pigment even when surface-treated pigments are used. Become.

As described above, even after long-term storage, the dental coating composition of the present invention disperses the pigment by 111 times just by shaking the composition immediately after use. It can be coated on the tooth surface without any change, and can form a coating that is uniform and has sufficient strength (f゛4'') on the tooth surface, compared to conventionally used coating materials. The quality is extremely stable.Also, the teeth can be changed to various colors other than tooth color.

Claims (4)

[Claims] (1) It is characterized by containing an inorganic pigment surface-treated with wax and/or hydrocarbons having a melting point of 30°C or higher in a volatile solvent solution of a resin capable of forming a water-resistant film. Dental coating composition. (2) The dental coating composition according to item (1) above, wherein a solution of the resin in a volatile solvent has a viscosity of 1000 centipoise or less at 20°C. (3) The dental product according to item (1) above, which contains 1 to 30% by weight of the inorganic pigment surface-treated with wax and/or hydrocarbons having a melting point of 30°C or higher based on the total weight of the inorganic pigment. Coating composition. (4) The surface-treated inorganic pigment is added in an amount of 0.00% based on the total weight of the composition.
The dental coating composition according to item (1) above, containing 5 to 30% by weight.