JPH03178650A - Dental restoration material - Google Patents

Abstract

PURPOSE:To obtain the dental restoration material which affords the appearance equiv. to the appearance of natural teeth and has a high aesthetic property with a simplified process by composing the material of a mantle body formed of translucent colored ceramics colored by being compounded with coloring agents and an opaque colored material for bonding or adhering or packing material to mount the mantle body to an abutment. CONSTITUTION:The dental restoration material is used by mounting the mantle body 3, such as dental crown, consisting of the translucent colored ceramics with the opaque colored adhesive layer 2 consisting of the material for bonding or adhering or a packing material to the abutment 1, such as abutment tooth. The color tones and appearance resembling to the color tones and appearance of the natural teeth are obtd. by the combined effect of the opaque colored adhesive layer 2 and the translucent colored mantle body 3. Crystallized glass and high-strength porcelain are adequately used as the ceramics to form the mantle body 3. Crystallized glass of a calcium phosphate system in particular is preferably used as the crystallized glass. The crystallized glass of the calcium phosphate system has the strength and bioaffinity suitable for the dental restored matter, has further excellent castability and machinability and affords an extremely high level of the aesthetic feel by an aesthetic property imparting technique.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an aesthetic dental restorative material that provides an appearance equivalent to that of natural teeth.

[Conventional technology]

Conventionally, the materials for dental restorations, typified by dental crowns, are:
Metal materials, porcelain materials, and polymer materials have been used. Among these, the metal materials include gold alloy, gold silver palladium alloy,
Nickel-chromium alloys are widely used, but although metal materials can be easily formed by casting and have excellent physical and mechanical properties, their appearance is completely different from that of natural teeth, resulting in poor aesthetics. Furthermore, eluted metal ions may cause discoloration of the gums and allergies. In addition, porcelain is mainly composed of feldspar diquartz and kaolin, with trace amounts of metal oxides added, and when molded into a tooth crown, it becomes a core of alumina, metal, etc. if necessary. The method used is to use different materials, and then pile up the porcelain in several batches and fire them. Dental restorations made of this porcelain material are hard, have excellent wear resistance and compressive strength, and can provide an appearance that is relatively similar to natural teeth, but are susceptible to arching, shearing, and impact, and are Not only does this have the disadvantage of abrading the enamel of natural teeth, but it is also very time-consuming and requires a great deal of skill, as it is fired in several batches as described above.

Furthermore, polymeric materials are made of liquid monomers and fillers, and are molded by being polymerized in several batches, so although processability is relatively good, crown molding is time-consuming. . Moreover, although it has relatively good aesthetics, it may change color over time, and it also has drawbacks such as insufficient hardness and easy wear.

On the other hand, recently, ceramics such as crystallized glass and high-strength porcelain have been attracting attention as alternatives to the above-mentioned materials. Among these, crystallized glass (glass ceramics) is made from glass, and after forming the glass using a casting method, crystals can be precipitated within the glass using a heat treatment method called ceraming. Various dental materials using this material have been proposed because it has strength, translucency, castability, compatibility, material processability, and biocompatibility suitable for various objects.

However, just by molding crystallized glass, it is not possible to obtain an appearance similar to natural one-stroke, which has slightly different color tones between the incisal end and the neck of the tooth. After molding, it is necessary to provide aesthetic properties.

Conventionally, as a method for imparting such aesthetics, a method is known in which a mica-based crystallized glass is used, the mica-based crystallized glass is formed into a crown, and the aesthetics are imparted by a method similar to the above-mentioned porcelain baking. That is, mica-based crystallized glass is SiO2,
20. M2O.

The main component is MgF2, but if you want to add aesthetic properties,
This is cast, and the crystallized tooth crown is first given an opaque feel.
Apply porcelain for adjustment and fire, then apply porcelain to give the body color and incisal color and fire, and finally make the crown. Check lines that match the characteristics of young teeth. This method involves drawing and firing porcelain to add hair lines and other characters, and by repeating this process of arranging and firing the porcelain, it creates highly aesthetically pleasing teeth that have an appearance similar to that of natural teeth. can get things.

In addition, the compressive strength of conventional porcelain is 6500 kg/am2, and the bending strength of high strength porcelain is 850 kg/cm2.
m2, while the compressive strength is 10500kg/am
2. The bending strength is 1800 kg/am", which is a greatly improved strength. This high-strength porcelain does not require a core material such as metal or alumina, and has a dentin color (body color) on a fireproof tooth mold. ), enamel color, and transparent color in that order, and by firing it at a predetermined temperature for several minutes, it is possible to obtain a crown that resembles a natural tooth.

[Problem to be solved by the invention]

However, the above-mentioned method of imparting aesthetics to ceramics requires repeating the application of porcelain and firing at least three times, which is extremely time-consuming and similar to the case of making dental crowns from porcelain. It is complicated and requires a long time to complete. Moreover, the material is glass? It is said that it is necessary to equip a high-temperature melting furnace of about 1,300 degrees Celsius, which ordinary dentists do not have. Furthermore, it requires a considerable amount of time and effort, and also requires equipment such as a special melting furnace, making it expensive in terms of cost.

Furthermore, the method of obtaining a crown using high-strength porcelain by the above method is also very troublesome, as it requires repeating building up and firing.

The present invention was made in view of the above circumstances, and the above-mentioned
The purpose of the present invention is to provide a highly aesthetic restorative material for teeth that provides an appearance equivalent to that of natural teeth through a simplified process by omitting the steps of ~(2).

[Means and effects for solving the problem] In order to achieve the above object, the present inventor conducted various investigations and found that when molding an outer covering such as a tooth crown with translucent ceramic, A coloring agent is added to the material to obtain a translucent colored ceramic outer shell, and coloring is added to the bonding/adhesive material or filling material used when attaching the outer shell to a support such as an abutment. When the color tone of the abutment is concealed by mixing these materials and forming them opaquely, the combined effect of the color tone of the above-mentioned translucent colored ceramic outer covering and the opaque colored coalescent/adhesive material or filling material. succeeded in providing an aesthetic appearance equivalent to that of natural teeth.

Particularly, preferably, the above-mentioned outer cover is provided in accordance with the Japanese Industrial Standards "Standard light and standard light source J for colorimetry (JIS28720
) The total light transmittance (Tt%, sample thickness 1,4n++++) measured by an integrating sphere light transmittance measuring device using the standard light specified in
) is 2.5YR to 10GY, brightness (V) is 5 to 9, and saturation (C) is 0 to 8. 2.5YR~I
OY, brightness (V) is formed to be 4 to 9, saturation (C) is 2 to 8, and the hue (H) is 7YR to 1.
7.6Y, brightness (V) of 4.5 to 8.5, and saturation (C) of 1 to 6, it is possible to obtain a highly aesthetic restoration with an extremely excellent appearance. I found out.

Therefore, according to this aesthetic imparting method, it is not necessary to cast and crystallize ceramics to produce an outer shell and then apply and bake porcelain at least three times, as in the conventional method. The color tone of the object and the bonding/bonding material or filling material is selected in advance according to the characteristics of the tooth of the wearer.
A restoration with an appearance equivalent to a natural tooth can be obtained by simply preparing an outer covering and attaching it to an abutment via a luting/adhesive material or a filling material, which eliminates the complexity of conventional techniques. It is something that can eliminate gender.

The present invention will be explained in more detail below.

The dental restorative material according to the present invention includes an outer covering made of translucent colored ceramic mixed with a coloring agent, and an opaque colored compound or adhesive material for attaching the outer covering to an abutment. or a filling material t', 1,000.

Here, as the ceramic forming the outer shell, crystallized glass or high-strength porcelain is suitably used. Mica-based crystallized glass can also be effectively used as the crystallized glass, but its crystallization mode is a volume crystal, and there are restrictions on adjusting the transparency, so it is particularly preferable to use calcium phosphate-based crystallized glass. This calcium phosphate-based crystallized glass preferably contains, for example, AQ, 03, etc. in addition to Cab and P2O5, and this gives a translucent feeling similar to natural teeth, but in this case, the basic component CaO Transparency can be easily adjusted by changing the usage ratio of and P, 05 or by changing the crystallization conditions (crystallization temperature and time), making it easy to express translucency according to the wearer's teeth. Is possible. In addition, calcium phosphate-based crystallized glass has excellent strength, biocompatibility, and castability and machinability suitable for dental restorations, and has a very high aesthetic appearance due to the aesthetic imparting method according to the present invention. It gives

In the present invention, in order to express a color tone similar to that of natural teeth, a coloring agent is blended into translucent ceramics, and the ceramics are colored while maintaining its translucency. As agents, zn, Fe, Mn,
W, Ce, Ti.

Examples include oxides of metals such as Ni, Co, Cr, and V.
By appropriately combining one or more of these,
The combined effect with the fusing/adhesive material or filling material described below gives it a color tone and translucence similar to natural teeth. In addition,
The blending amount of these colorants is adjusted depending on the desired color tone.

In this case, when using high-strength porcelain, conventional
Unlike the method of repeating firing, only the body color is built up on the refractory tooth mold and fired to obtain a translucent crown.By combining this with the fusing or adhesive material or filling material described later, Since it is possible to obtain an aesthetically pleasing crown, which is the object of the present invention, the outer covering can be obtained by one-time application and firing using only high-strength porcelain body-colored porcelain.

On the other hand, as the bonding or bonding material or filling material used in the present invention, known materials used for attaching dental materials (!salts) can be used. A type in which a powder made of zinc oxide, silicates, aluminosilicate, etc. is mixed and kneaded with a liquid made of phosphoric acid, eugenol, polyacrylic acid aqueous solution, etc., and the kneaded product is used to bond the adherend. is used.

Furthermore, as the adhesive material and the filling material, materials made of polymerizable monomers, fillers, catalysts, activators, polymerization inhibitors, etc. are used.

In the present invention, a coloring agent is blended to color the above-mentioned material, and the coloring agent includes Fe and Ni.

The same metal oxides as the coloring agent used to obtain the colored outer covering, such as Co, Mn, and Ti, can be used,
The combination and amount added are selected depending on the desired color tone.

In the present invention, the above-mentioned material is formed to be opaque, but it is preferable that a masking agent is added to the material. That is, the abutment tooth to which the crown is attached may be a natural tooth, but it is actually made of gold pA (gold alloy).

In many cases, the abutment teeth are constructed using palladium alloy, silver alloy) or resin (composite resin), and the color tone of the abutment tooth varies depending on the material used. Moreover, if the building is made of metal, the metal color may turn black due to oxidation.

On the other hand, since the thickness of the adhesive layer made of the above-mentioned materials on which the crown is attached is usually 50 to 150 μm, the color tone of the abutment tooth is reflected in the adhesive layer, which changes the appearance of the semi-transparent tooth crown (outer body). There is a risk of adverse effects. Hiding agents are blended to prevent such effects, and examples of hiding agents include titanium oxide and mica. ) is preferably used, and in order to effectively exhibit the above effects, it is preferable to blend titanium oxide so that it is contained in the adhesive layer in an amount of 10% or more (by weight, the same shall apply hereinafter), thereby reducing the thickness of the adhesive layer. Even if the thickness is about 50 μm, the color of the abutment tooth can be sufficiently hidden.

As shown in the drawings, the dental restorative material according to the present invention is produced by bonding translucent colored ceramics to an abutment 1 of an abutment via an opaque colored adhesive layer 2 made of a bonding or bonding material or a filling material. It is used by attaching an outer covering 3 such as a dental crown, and the combined effect of the opaque colored adhesive M2 and the translucent colored outer covering 3 gives a color appearance similar to that of natural teeth.

Here, in the crown configuration shown in the drawing, the restoration is usually viewed from the side, and in the drawing, part A (center) has a composite color tone of adhesive N2 and outer cover 3, and part B has a composite color tone of adhesive N2 and outer cover 3. (peripheral area) has the translucency and color tone of only the outer cover 3, and the combined effect of these provides an appearance and texture equivalent to natural teeth.

In this case, in order to obtain a restoration that gives an appearance equivalent to a natural tooth, the above composite color tone must be 7YR to 7YR as the hue (1-I).
7.5Y, more preferably 9YR to 4Y, brightness (V) 4.5 to 8.5. It is preferable to select the color tone of the adhesive layer and the outer covering so that the iJ is preferably 6 to 8, and the saturation (C) is 1 to 6, more preferably 2 to 5.
In particular, the total light transmittance (Tt%) measured using standard light is 40 to 60%, more preferably 45%.
~55%, hue (H) of 2.5YR to 10GY, more preferably 5YR to 5GY, brightness (V) of 5 to 9, more preferably 7 to 9, and saturation (C) of 0 to 8. Preferably, it is adjusted to 2 to 5.

The hue (H) of the adhesive layer is 2.5YR to IOY, more preferably 5YR to 5Y, the brightness (V) is 4 to 9, more preferably 6 to 9, and the saturation (C) is 2 to 8, more preferably 2-6
By adjusting the color tone and expressing the color tone within the range of hue, lightness, and saturation of the above-mentioned composite color tone, it is possible to provide a restoration that is more similar to a natural tooth. That is, as a result of examining the appearance of natural teeth, the present inventor determined that the Tt of the outer covering should be 40 to 40.
It has been found that a range of 60%, more preferably 45 to 55%, gives a transparent feel similar to natural teeth.
The color tone of natural teeth varies over a wide range, and Vita's shade guide (
Vita Corporation) is widely used, and this is a method that improves the color of natural teeth by 1
It is classified into 6 types: H, V, and C for the outer cover and adhesive layer.
be the range mentioned above, and H, V, of these composite tones,
It has been discovered that by setting C within the above-mentioned range, the 16 types of Vita shade guides can be expressed accurately.

Therefore, by using the type and amount of the coloring agent incorporated in the outer cover and the adhesive layer so that the color tone range is as described above, a restoration that has an excellent natural tooth appearance can be obtained.

〔Effect of the invention〕

The dental restorative material of the present invention is produced by casting and crystallizing a ceramic material containing a coloring agent to form a translucent colored outer covering.
This is a simple operation of attaching this to the abutment using opaque colored luting, adhesive material, or filling material, and it is an inexpensive, highly aesthetic restoration that does not require special equipment and has an appearance equivalent to natural teeth. It gives

Experimental examples and examples will be shown below, but the present invention is not limited to the following examples.

[Experiment example]

Adhesives having the following compositions with varying degrees of 'r i ozilt in the powder were prepared and applied on a white board and a black board, respectively, to form an adhesive layer with a thickness of 5014 mm. Next, the color difference ΔE of the adhesive layer between the white board and the black board was determined using a color difference meter.

The results are shown in the schedule.

Wings 10u4 prisoners powder agent T　i　O.

Amounts shown in Table 1: Benzoyl peroxide 2.0% by weight Quartz balance 100.0% by weight Liquid methyl methacrylate 48.6 Aromatic amine 1.2 Antioxidant 0.2 IJ 100.0% by weight (When used: King The relationship between color difference ΔE and sensory expression is shown in Table 2.

From the results shown in Table 1 and above, it is recognized that containing 10% or more of TiO2 in the adhesive layer results in a slight color difference and can sufficiently hide the color of the base.

In addition, when we asked a panel of 10 people whether they were concerned about the color difference of an adhesive layer containing 10% or more of TiO2, the following responses were answered:
Eight people answered, "It doesn't bother me at all," and the above results were also confirmed sensually.

[Example 1] A dental crown in the form of a front tooth was produced by casting using calcium phosphate crystallized glass having the following composition. Also, Tt of this tooth crown,
H, V, and C were each set to dl.

And - precepts CaO44.6 mole parts P2O554 AQ20. 3.4 NiOO,03 Ru0.　　　　　0.005 C000,○01 Inspection Wife Kuen Shoyou T t 53.3% H2,50Y V 8.52 C2,48 Meanwhile, below! The adhesives (liquid and powder) were prepared.

In addition, H, V, and C were measured when the liquid agent and powder agent were mixed and kneaded.

Liquid agent Methyl methacrylate Aromatic amine Antioxidant Powder Quartz titanium oxide Tetraferric oxide Ferric hydroxide Benzoyl peroxide 50 1.2 0.2 62.0 parts by weight 30. 0 0.5 0.4 5.1 2.0 mm 8 5YR V 8.32 C3,55 Next, after applying the above mixed paste to the abutment tooth, the above tooth crown is attached, and this When a dental technician mounted this on a JM mannequin (manufactured by Morita Seisakusho Co., Ltd.) and evaluated it, he found that it was similar to Vita's shade guide A2.

The composite color tone of the mixed paste and tooth crown is H2,40Y. V 7.74 C3,44 Met.

[Example 2] A dental crown in the form of a front tooth was produced by casting using calcium phosphate crystallized glass having the following composition. Also, Tt of this tooth crown,
H, V, and C were each measured.

death - precepts CaO44 mole parts P2O,54 AI220.　　　　　　2.2 Mg○ 1.5 NiOO,05 Rub2 0.01 Cliff 2 Siri Utsu i Tt 51.1% H3, 17Y V 7.1 6 C2,31 On the other hand, adhesives (liquid and powder) having the following compositions were prepared.

In addition, H, V, and C were measured when the liquid agent and powder agent were mixed and kneaded.

Hoshi-ku liquid agent methyl methacrylate 50 Aromatic amine 1.2 Antioxidant
0.2 powder titanium quartz oxide triiron tetraoxide ferric hydroxide (m) Benzoyl peroxide ゛H9,7YR V 8,02 C4,21 Next, apply the above mixture to the abutment tooth. After applying the material, the tooth crown was attached and mounted on a JM mannequin (manufactured by Morita Seisakusho Co., Ltd.). When a dental technician evaluated this, he found that it was similar to Vita's Shade Guide B.

The composite color tone of the mixed paste and tooth crown is H3,55Y. 71.98 parts by weight 25.0 0.02 0.1 0.9 2.0 6.67 2.25 Met.

[Experiment Example 3] High strength porcelain [Optech H3P system (gl(
Yoshida Co., Ltd.) body porcelain (Dentin color Bod)
A tooth crown in the form of an anterior tooth was manufactured according to the method instructed using yC-4). Its appearance properties were as follows.

Inspection and summer madness Tj 46.5Hl0YR V 8.01C2,1
4 On the other hand, adhesives (liquid and powder) having the following compositions were prepared.

In addition, H, V, and C were measured when the liquid agent and powder agent were mixed and kneaded.

Anti-inflammatory solution Proboxyphenyl propane methyl methacrylate 48.6 Aromatic amine antioxidants Titanium quartz oxide Triiron tetraoxide Iron hydroxide Benzoyl peroxide Raw' H5Y V 7.53 C2, 65 Next, the abutment tooth was coated with the mixture described in "2" above, and the tooth crown was attached, and this was mounted on a JM mannequin (manufactured by Morita Seisakusho Co., Ltd.). When a dental technician evaluated this, he found that it was similar to Vita Shade Guide 03.

In addition, the composite color tone with the mixed kneaded product is H2,2Y V 6.76 1゜ 66° 0t o.

Engineering.

2゜ Oo 0 parts by weight 5 5 2゜ 5 Met.

4,

[Brief explanation of drawings]

The drawing is a sectional view showing an example of a restoration according to the present invention. Engineering... support, ・Adhesive layer, ・Outer cover

Claims (1)

[Scope of Claims] 1. An outer shell made of translucent colored ceramic mixed with a coloring agent, and an opaque colored compound or adhesive material or filling for attaching the outer shell to a support. A dental restorative material consisting of a dental material. 2. The composite color tone of the outer cover and the bonding or adhesive material or filling material is 7YR to 7.5Y, 4.5 to 8
．． The dental restorative material according to claim 1, which has a brightness of 5 and a saturation of 1 to 6. 3. The above outer covering has a total light transmittance of 40 to 60%, a hue of 2.5YR to 10GY, and a brightness of 5 when measured using standard light.
-9 and a saturation of 0 to 8, and the bonding or adhesive material or filling material has a hue of 2.5YR to 10Y, a lightness of 4 to 9, and a saturation of 2 to 8. Dental restorative materials. 4. The dental restorative material according to any one of claims 1 to 3, wherein the outer covering is a calcium phosphate crystallized glass.