JP2665501B2 - Synthetic calculus paste - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is a synthetic composition that can be suitably used in the field of dentistry, such as for the study of dentistry medical technology and practical training for dentist students and dental hygienists. For calculus paste, in detail, excellent adhesion to model teeth, especially P ₂ O ₅ -C _a O system crystallized glass model teeth, its properties and feeling when removing,
The present invention relates to a synthetic calculus paste having characteristics and the like excellent in similarity to the case of tartar actually generated in the oral cavity.

[Prior art and its problems] Conventionally, synthetic dental calculus of MMA-based immediate-polymerized resin is adhered to a tooth model, that is, a melamine resin model tooth, or a cosmetic nail manicure is applied to the tooth surface to provide a dental care technique. It is widely used for research and skeletal training for dental medical students and dental hygienists.In this field, especially for the acquisition of an appropriate synthetic calculus removal technology, the calculus that actually occurs in the oral cavity Further, there is a further demand for a model tooth provided with synthetic tartar having similar properties such as color, shape, thickness, and adhesive strength, particularly, removal sensation and removal characteristics.

Conventionally, a composite resin made of a melamine resin has been used as a model tooth or an artificial tooth.

However, although these are similar in appearance to living teeth, they have low hardness and a completely different feeling of cutting, and even if artificial tartar is adhered to them, they are used as learning materials for learning the cutting and removing technology of tartar. Was unsuitable.

To improve this point, a tooth model made of P ₂ O ₅ —C _a O-based crystallized glass was developed, and artificial tartar was adhered to the tooth model and used as a teaching material for removing tartar.

The crystallized glass model tooth is usually P ₂ O ₅ 1 to 50 wt%, C _a O10~55 wt%, crystallized glass the total amount of P ₂ O ₅ and C _a O contains 15 to 80 wt% The crystallized glass is composed of apatite [Ca
₁₀ (PO ₄ ) ₆ O] and similar tribasic calcium phosphate [Ca ₃ (P
O ₄ ) ₂ ]. Further, the model tooth can have a two-layer structure of enamel and dentin by changing the composition of the crystallized glass.

In addition, a metal scaler or the like is generally used for removing artificial tartar.

On the other hand, as a conventional artificial tartar, there is known a tartar set (manufactured by Nissin Co., Ltd.) together with a melamine resin model tooth. The artificial tartar is
According to the composition analysis, a liquid part consisting of methyl methacrylate containing a very small amount of aromatic amines, SiO ₂ 47.9
%, Al ₂ O ₃ 14.8% by weight, Na ₂ 1.8% by weight, and a powder portion formed of a sphere having a diameter of about 30 μm and composed of other components.

However, the conventional artificial calculus has a problem in that when it is adhered to the crystallized glass model tooth, the adhesiveness is significantly poorer than when it is adhered to the melamine resin model tooth.

 The present invention has been made based on the above circumstances.

An object of the present invention has a suitable hardness, close to the human body tartar, and have a high adhesive strength even to model tooth especially P ₂ O ₅ -C _a O system crystallized glass model tooth, Moreover, it is an object of the present invention to provide a synthetic calculus paste capable of producing a synthetic calculus excellent in removal feeling, which is not different from that of a human tartar, and excellent in performing skeletal training.

[Means for Achieving the Object] As a result of intensive studies to solve the above problems, the present inventors have found that synthetic tartar composed of glass powder and hardened resin satisfies the object of the present invention. And completed the present invention based on this finding.

That is, the present invention to achieve the above object provides a synthetic calculus paste containing glass powder and a polymerizable curable organic compound.

 The present invention will be described in detail.

The glass powder used as a constituent part of the synthetic calculus paste of the present invention is an indispensable material for making the hardness, color tone, and removal sensation equal to those of human calculus.

The glass used for the present synthetic tartar is not particularly limited as long as it is generally a glass material having high chemical durability.
For example a window _{glazing, N a2 O-B a O} -SiO 2 based glass, borosilicate glass, alumina silicate glass, silica glass and P ₂ O ₅ -C _a O system crystallized _{glass, Li 2 O-Al 2 O} 5 - SiO ₂ based crystallized _{glass, C a O-Al 2 O} 3 -SiO 2 based crystallized glass, MgO-Al ₂
O ₃ -SiO ₂ based crystallized glass can be used.

The particle size of the glass powder is not particularly limited, but is preferably 100 mesh or less in order to prevent separation of the paste.

In addition, the glass powder desirably contains one or two or more kinds of small coloring components.

The coloring component is not particularly limited as long as the synthetic calculus provided on the model tooth exhibits a color that can be easily distinguished from the model tooth by one or more of the above-described combinations. A color similar to the color of tartar generated in the oral cavity, that is, a color that usually exhibits brownish brown to yellowish brown is preferable.

Such coloring components include, for example, CeO, MnO ₂ , Fe ₂ O ₃ , V
Colored metal oxides such as ₂ O ₅ and Fe-Cr-Zn spinel
It can be species or two or more species.

In addition, by using the above-mentioned appropriate coloring component, not only can the synthetic calculus portion and the model tooth portion be easily distinguished, but also the mixed state of the glass powder and other components can be easily determined.

The synthetic calculus paste of the present invention is usually a polymerizable curable organic compound, that is, one or more kinds of organic compounds curable by polymerization, or additives such as a polymerization initiator, an organic solvent, and a polymerization accelerator. It is a composition containing a polymerizable and curable organic compound.

The polymerization-curable organic compound itself is heat-treated,
As long as it can be polymerized and cured by irradiation or the like, it can be used as it is, but usually, as described above, a polymerization initiator, an organic solvent, and an additive such as a polymerization accelerator are appropriately compounded and used. .

As the polymerization-curable organic compound and a composition containing the same, after subjected to an appropriate polymerization-curing treatment, the model tooth to be used, in particular, a high P ₂ O ₅ -C _a O-based crystallized glass model tooth. Various materials can be used without particular limitation as long as they can provide an adhesive force.

In general, for example, dimethacrylate monomers can be suitably used as the polymerization-curable organic compound. In particular, as an additive to the dimethacrylate monomers,
A polymerization-curable organic compound-containing composition obtained by appropriately adding a polymerization initiator such as an organic peroxide, an organic solvent, and a polymerization accelerator such as a tertiary amine can be suitably used.

The dimethacrylate monomers are diesters of methacrylic acid with dihydric alcohols or phenols, and specifically, for example, 2,2-bis (4-
(Methacryloxyphenyl) propane (BPDMA), 2,2-bis (4-methacryloxyethoxyphenyl) propane (Bis-MEPP), 2,2-bis (4-methacryloxypolyethoxyphenyl) propane (Bis-MPEPP), 2,2-bis [4- (3-methacryloxy-2-hydroxypropoxy) -phenyl] propane (Bis-GMA) and ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate and the like can be mentioned. And diglycidyl dimethacrylates such as bisphenol diglycidyl dimethacrylate and polyethylene glycol dimethacrylate (including ethylene glycol dimethacrylate), and particularly 2,2-bis [4- (3-methacryloxy-2-hydroxypropoxy). - phenyl] propane (Bia-GMA) and ethylene glycol dimethacrylate is preferred.

These may be used alone or in combination of two or more.

As the organic solvent in the polymerization-curable organic compound-containing composition, a liquid organic compound that is inert to the polymerization initiator to be used and has a high boiling point can be used. And dialkyl phthalates such as dimethyl phthalate, diethyl phthalate, dibutyl phthalate, di-n-octyl phthalate and di-n-octyl terephthalate.

The polymerization accelerator can be appropriately selected from known ones, and among them, tertiary amine and the like can be preferably used.

As the tertiary amine, those having a relatively high boiling point are preferable, and among them, aromatic tertiary amines such as N, N-dimethylaniline, N, N-dimethyl-P-toluidine, P-tolyldiethanolamine and the like are preferable. Amines can be suitably used.

The polymerization initiator can be appropriately selected and used from known ones according to the type of polymerization curable organic compound to be used, the method of polymerization curing, and the like.For example, when curing is performed by radical polymerization, Radical initiators such as oxidized oxides and organic azo compounds can be used, and among them, oxidized oxides such as benzoyl peroxide can be suitably used.

As the polymerization and curing method, the above-mentioned radical polymerization method can be suitably used, but radiation polymerization by irradiation with radiation such as light or ultraviolet light can also be used.

This polymerization curing can be carried out at room temperature, but can also be carried out by heating if desired.

The ratio between the glass powder contained in the synthetic calculus paste of the present invention and the polymerization-curable organic compound cannot be uniformly defined because it varies depending on the type of raw materials used, the amount of additives used, and the like. It is desirable to set the glass powder in the range of usually 150 to 350 parts by weight, preferably 230 to 280 parts by weight, per 100 parts by weight of the organic compound.

The amount of the organic solvent used cannot be uniformly defined because it significantly varies depending on the type of raw materials used and the like.
It is suitable that the amount is in the range of 7575 parts by weight, preferably 35-60 parts by weight.

The polymerization initiator and the polymerization accelerator may be added in an appropriate amount depending on the type of the raw material used, the polymerization method, and the like.

When producing synthetic calculus according to the present invention, the glass powder and the polymer-curable organic compound or the polymer-curable organic compound-containing composition containing the same are mixed at a predetermined ratio as described above, and a paste-like composition is prepared. , The composition is applied to a predetermined model tooth, and the applied substance is cured to obtain the composition.

The mixing method at this time is not particularly limited, and the raw materials to be used may be mixed at once, may be mixed in a stepwise manner, or may be any one of them. For example, the polymerization curable organic compound and the polymerization initiator may be mixed. It is particularly preferable to separately mix with the glass powder, prepare two types of paste-like compositions (A) and (B), and mix them at a predetermined ratio at the time of use. .

The model tooth to be used is not particularly limited,
The P ₂ O ₅ -C _a O-type crystallized glass of the model tooth can be suitably used. These model teeth may be either commercial products or newly manufactured ones.

The synthetic calculus according to the present invention thus obtained has excellent adhesion to the model tooth, the P ₂ O ₅ -C _a O-based crystallized glass model tooth, and when used as a teaching material for removing tartar, It has excellent properties such that the feeling of removal is remarkably similar to the feeling when removing the tartar actually generated in the oral cavity.

Next, a particularly preferable production method as a method for producing the synthetic tartar of the present invention will be described in detail.

In the preferred method for producing synthetic tartar of the present invention, first, a polymer-curable organic compound (A1) and a tertiary amine (A
2) a paste-like composite curable composition (A) (hereinafter sometimes simply referred to as paste A) comprising glass powder (A3), a polymerization initiator (B1) and a polymerization initiator (B1). A paste-like composite curing agent composition (B) comprising an organic solvent (B2) and a glass powder (B3) which are inert to the composition (hereinafter sometimes simply referred to as paste B) is prepared.

As the polymerization-curable organic compound (A1), dimethacrylate monomers as described above can be used. Among them, diglycidyl dimethacrylates (A1
a) and polyethylene glycol dimethacrylates (A1
Preferably, b) is used in combination.

As the component (A1a), bisphenol diglycidyl dimethacrylate is particularly preferable, and 2,2-bis [4- (3-methacryloxy-2-hydroxypropoxy) -phenyl] propane (Bis-GMA) is particularly preferable.

Examples of the component (A1b) include oligoethylene glycol dimethacrylates such as ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, and triethylene glycol dimethacrylate. Among them, ethylene glycol dimethacrylate is preferable.

These components (A1a) and (A1b) may be used alone or in combination of two or more.

As the tertiary amines (A2), aromatic tertiary amines can be suitably used as described above,
Particularly, N, N-dimethyl-P-toluidine is preferred.

In the paste A, the proportion of the components (A1), (A2) and (A3) is usually 0.25 to 2.0 parts by weight, preferably 0.4 to 100 parts by weight of the component (A1) used.
0 to 1.25 parts by weight, usually 50 to 150 parts by weight of the component (A3), especially
It is preferably in the range of 80 to 120 parts by weight.

The component (A1) is preferably a combination of the component (A1a) and the component (A1b) as described above,
In particular, as 100 parts by weight of the component (A1), usually 70 to 95 parts by weight of the component (A1a) and 5 to 30 parts by weight of the component (A1b), particularly 85 to 95 parts by weight of the component (A1a) (A1b)
It is preferred to prepare Paste A of the above composition using the components in a proportion of 5 to 15 parts by weight.

If the proportion of the component (A1a) is too large, mixing may be difficult. On the other hand, if the proportion is too small, the composition may be hardly cured or the adhesive force to the model tooth may be reduced. If the proportion of the components is too large, curing may be difficult, while if too small, mixing may be difficult.

If the proportion of the component (A2) is too large, the coagulation time becomes extremely short when the paste A and the paste B are mixed, so that it may be difficult to secure time for applying the synthetic calculus paste to the model tooth. On the other hand, if the amount is too small, the paste hardly solidifies.

When the proportion of the component (A3) is too large, mixing becomes difficult or the operability may be reduced. On the other hand, when the proportion is too small, the synthetic tartar obtained becomes like the resin itself, and the calculus feeling,
The feeling of removal may decrease.

The method for preparing the paste A is not particularly limited as long as the above composition is satisfied, but usually the following preparation method can be suitably used.

That is, after the components (A1a), (A1b) and (A2) are uniformly mixed at a predetermined ratio, a predetermined amount of the component (A3) is added, and then the mixture is usually mixed with a kneader such as a two-roll mill. After kneading for 60 minutes, preferably for 20 to 40 minutes, paste A is obtained.

On the other hand, as the polymerization initiator (B1), various organic oxides can be suitably used, and velzoyl peroxide is particularly preferable.

As the inert organic solvent (B2), any liquid organic compound which is inert to the component (B1) and has a high boiling point can be used, but it can be used for the components (B1) and (A1). Those having excellent solubility are desirable, such as dimethyl phthalate, diethyl phthalate, di-n-butyl phthalate, di-n-octyl phthalate, di-n-octyl terephthalate, and the like. Particularly, di-n-octyl terephthalate and the like are preferable.

The components (B1) and (B2) may each be a single compound or a combination of two or more compounds.

The component (A3) in the paste A and the component (B3) in the paste B may have the same or different composition, particle size, color, and the like. )) And the composition (B), it is desirable to set the color of the resultant synthetic tartar to be similar to that of the tartar generated in the oral cavity, for example, brown or yellowish brown. It is preferable to adjust the color tone so that the colors of the paste A and the paste B containing these can be clearly distinguished.

Thus, the glass powder is mixed with paste A and paste B.
And pastes A and B are obtained by mixing the pastes A and B with each other so that they can be changed into the above-mentioned tartar-like color by mixing. But,
It can be easily determined whether or not uniformity has been achieved.

Specifically, for example, MnO ₂ , Ca
Using a glass powder colored in purple by adding coloring components such as O and Fe ₂ O _3, and adding coloring components such as Ti-Sb-based spinel and Y ₂ O ₃ -containing ZrO ₂ as component (B3). And a method using a glass powder colored yellow.

In addition, by using the component (A3) and the component (B3) exemplified above, it is possible to obtain brown-colored synthetic tartar similar to actual tartar.

(B1) and (B2) when preparing the paste B
The ratio of the component (B3) and the component (A1) in the paste A
(B1) component is usually 0.05 to 1.00 parts by weight per 100 parts by weight,
Preferably, 0.15 to 0.50 part by weight, the component (B2) is usually 20 to
80 parts by weight, preferably 30 to 60 parts by weight, the component (B3) is usually
It is set so as to be in the range of 120 to 180 parts by weight, preferably 140 to 170 parts by weight.

If the proportion of the component (B1) is too large, the curability will be reduced, and the coated product may run off or undergo phase separation. On the other hand, if the proportion is too small, mixing may be difficult.

When the proportion of the component (B2) is too large, the coagulation time becomes extremely short when the paste A and the paste B are mixed, and it may be difficult to secure the operation time for applying the synthetic calculus to the model tooth. If the amount is too small, curing may be difficult.

If the proportion of the component (B3) is too large, mixing becomes difficult or operability may be reduced. On the other hand, if the proportion is too small, the resultant synthetic calculus becomes like the resin itself, and the calculus feeling,
The feeling of removal may decrease.

The method for preparing the paste B is not particularly limited as long as the above composition is satisfied, but usually, the following preparation method can be suitably used.

That is, after the components (B1) and (B2) are uniformly mixed at a predetermined ratio, the component (B3) is added in a predetermined amount, and then the mixture is stirred for a period of time in the same range as in the case of the paste A. It is adjusted by kneading with a kneader such as a roll.

After the pastes A and B having the above composition are prepared, the pastes A and B are mixed.
The mixture obtained by mixing the pastes A and B at desired times is applied to a predetermined model tooth, preferably the P ₂ O ₅ —C _a O-based crystallized glass model tooth, and cured. Then, the target synthetic tartar is adhered to the model tooth.

In applying the paste mixture to the model tooth, a higher adhesive strength can be obtained by preliminarily etching the coated surface of the tooth with a phosphoric acid aqueous solution having a concentration of 30 to 40% by weight, washing with water and drying.

The mixing ratio of the paste A and the paste B is usually the same weight, but it is also possible to mix the A: B (weight ratio) in the range of 25:75 to 75:25.

As a method of mixing the paste A and the paste B,
Although not particularly limited, as a mixing method at the time of use, for example, the following method can be suitably applied in a normal case.

That is, take a predetermined amount of paste A and paste B,
Using a spatula made of plastic or the like, mix uniformly on a sheet of wax-coated paper or the like until no color unevenness is present.

The application and curing conditions are not particularly limited, but usually, a uniform mixture of the pastes A and B is applied to a predetermined model tooth by a plastic filler or the like, and is usually 5 to 5 at room temperature. Let stand for about 10 minutes.

In this way, the applied material hardens almost, but the surface of the resulting synthetic tartar may be slightly sticky.To remove the sticky, wipe it off with a cloth or use 60 to 80 ° C hot water. Soak the model tooth with the model tooth for 5 to 10 minutes.

The curing time may vary depending on the type and composition of the raw materials used, and the curing time can be shortened by heating, if desired.

As the curing condition, it can be usually carried out at room temperature, but may be heated if desired.

The time required for curing varies depending on the type, composition and curing temperature of the components used, and cannot be specified unconditionally, but is usually about 4 to 6 minutes.

As described above, the target synthetic tartar can be provided on the model tooth.

As described above, the method of manufacturing synthetic calculus uses a specific manufacturing method via two types of paste components, so that the raw material of calculus can be supplied to the user in a paste state. At a desired time, it can be provided in a desired shape on a predetermined model tooth, and by using coloring components of different colors for each paste component, mixing of each paste component is ensured while ensuring uniformity. This is a method for producing synthetic calculus, which has excellent advantages such as easy understanding of the completion time of mixing when mixing different types of pastes, and is extremely advantageous in practice.

Synthesis tartar obtained in this manner has an appropriate hardness, excellent tartar feeling, and excellent adhesion even to model tooth especially P ₂ O ₅ -C _a O system crystallized glass model tooth Since the feeling of removal is excellent in the similarity to tartar generated in the oral cavity, it can be suitably used in the dental field and the like, including teaching materials for learning a scaling operation.

[Examples] Next, the present invention will be specifically described with reference to examples of the present invention. It is needless to say that the present invention is not limited to the following embodiments, and can be appropriately modified and implemented within the scope of the present invention.

Example 1 2,2-bis [4- (3-methacryloxy-2-hydroxypropoxy) -phenyl] propane (Bis-GMA) 45
g, 5 g of ethylene glycol dimethacrylate, and 0.25 g of N, N-dimethyl-P-toluidine were uniformly mixed.

Next, 150 g of glass powder colored in purple was added, and then kneaded with two rolls for 30 minutes to prepare Paste A.

The glass powder has the following properties.

Glass powder properties (composition) SiO ₂ 65 (parts by _{weight) Al 2 O 3 15 B a} O 15 N a2 O 8 K 2 O 5 MnO 2 1.9 C a O 0.1 ( standard) size 100 mesh or less 0.125g of benzoyl peroxide (BPO) 25 g of di-
Uniformly dissolved in n-octyl phthalate (DOP), and 75 g of glass powder having the following properties colored yellow is added thereto,
Thereafter, the mixture was kneaded with two rolls for 30 minutes to prepare a paste B.

The glass powder has the following properties.

Properties of the glass powder _{SiO 2 65 TiO 2 -Sb 2 O} 3 spinel _{2 Al 2 O 3 5 B a} O 20 B a O 5 N a2 O 3 K a O 2 ( standard) size 100 mesh or less then above 1 g each of the pastes A and B prepared above were placed on kneaded paper and mixed uniformly using a plastic spatula over 30 seconds. A part of this mixture was taken in a plastic filling device, applied to the following model teeth, and allowed to stand for 7 minutes. As a result, strongly adhered synthetic tartar was obtained.

Material (composition) of the model tooth P ₂ O ₅ 15% by weight C _a O 30 〃 SiO ₂ 10 〃 MgO 10 〃 TiO ₂ 5 な の で Since it is difficult to directly measure the adhesive strength of the synthetic calculus adhered to this model tooth, A uniform mixture of the paste A and the paste B was applied and cured on the crystallized glass plate in the same manner as described above, and the adhesive strength was measured.
A value of / cm ² was obtained. When the crystallized glass surface was etched with a 30% by weight phosphoric acid aqueous solution, an adhesive strength of 50 kg / cm ² was obtained.

Further, when the synthetic tartar (the mixture of the pastes A and B) itself was cured, the Brinell hardness was 9 to 10, and the compressive strength was 400 kg.
A value of / cm ² was obtained.

(Comparative Example) A commercially available synthetic calculus adjusting composition (manufactured by Nissin Co., Ltd., trade name calculus set) was applied and cured on a model tooth made of crystallized glass similar to that used in Example 1. It was easily exfoliated when applied to a scaler and was not intended for practice in scaling.

The commercially available composition for adjusting synthetic calculus was applied to a crystallized glass plate and cured in the same manner as in Example 1, and the adhesive strength was measured. As a result, a very low value of 0.5 to 10 kg / cm ² was obtained.

[Effects of the Invention] According to the invention of the present application, since a specific component is used, it has an appropriate hardness, an excellent calculus feeling, and a model tooth, particularly _a model made of _a P ₂ O ₅ —C _a O-based crystallized glass. It has high adhesion to teeth, and its cutting feel is similar to actual tartar.
It is possible to provide synthetic calculus which is extremely excellent in practical use.

As described above, the method of manufacturing synthetic calculus uses a specific manufacturing method via two types of paste components, so that the raw material of calculus can be supplied to the user in a paste state. At a desired time, it can be provided in a desired shape on a predetermined model tooth, and by using coloring components of different colors for each paste component, mixing of each paste component is ensured while ensuring uniformity. This is a method for producing synthetic calculus, which has excellent advantages such as easy understanding of the completion time of mixing when mixing different types of pastes, and is extremely advantageous in practice.

Claims (2)

(57) [Claims] 1. A synthetic calculus paste comprising glass powder and a polymer-curable organic compound. 2. The synthetic calculus paste according to claim 1, wherein the polymerization-curable organic compound is a dimethacrylate monomer.