JP5566097B2 - Dental color conformity confirmation material - Google Patents

Description

  The present invention relates to a dental color conformity confirmation material used for confirming the color conformability of dental cement.

  The dental color tone conformity confirmation material is used in dentistry to determine the color tone of a cement used when a dentist attaches a dental prosthesis such as an inlay, onlay, or veneer to an abutment tooth. Generally, dental cement is selected from several types of colors, and the aesthetics of the prosthesis after bonding are determined by the color tone of the prosthesis itself and the color tone of the dental cement after polymerization and curing. Since it depends on the combination, it is necessary to use a dental cement that exhibits an appropriate color tone after bonding in order to obtain an aesthetically excellent finish. For this purpose, clinical work is carried out in which the prosthesis is temporarily applied to the abutment tooth using a color tone conformity confirmation material set to the same color tone as that of the dental cement after polymerization hardening, and its aesthetics are confirmed. It has been broken.

  When the desired color tone is obtained by trial, the prosthesis is removed, and after washing the dental color tone conformity confirmation material adhering to the inner surface of the prosthesis and the abutment tooth by washing, The prosthesis is bonded using dental cement that exhibits the same color tone as the dental color tone conformity confirmation material used for trial use. When the desired color tone is not obtained by the trial fit, the trial fit is performed again using the color tone conformity confirmation material of another color tone. The trial work is repeated until the desired aesthetics are obtained.

  Such a dental color conformity confirmation material uses dental cement after trial work and attaches the prosthesis to the tooth surface, but the dental color conformity confirmation material remains on the tooth surface. As a result, the cementing force of the dental cement is reduced, which may cause the prosthesis to fall off. Therefore, it has been desired to develop a dental color conformity confirmation material that exhibits excellent removability by washing with water after trial work.

  For example, Patent Document 1 describes a dental color tone conformity confirmation material containing glycerin and two types of fillers. Patent Document 2 describes a dental color tone conformity confirmation material composed of polyethylene glycol that is liquid at room temperature and polyethylene glycol particles that are solid at room temperature.

JP 2007-137851 A US Pat. No. 6,579,919

  However, even if dental color tone conformity confirmation materials having these compositions are used, the removability by water washing after the trial work is not satisfactory one step at a time, causing a reduction in the adhesion of dental cement.

  Patent Document 1 describes that water may be further added to the composition composed of the glycerin and two types of fillers as an optional additive to the extent that the effects of the invention are not impaired. However, the examples used in the examples are not shown, there is no description of the specific blending amount, and the intended amount can be read as a small amount from the description that does not impair the effects of the invention. Absent.

  In Patent Document 2, mixing of polyethylene glycol particles solid at room temperature with polyethylene glycol particles of the same liquid is carried out by dissolving overnight by heating. This heating operation was extremely complicated.

  Against this background, an object of the present invention is to provide a dental color conformity confirmation material that is excellent in removability by water washing after trial work and is easy to manufacture.

The inventors of the present invention have made extensive studies to overcome the above technical problems. As a result, it has been found that the above-mentioned problems can be solved by blending polyethylene glycol , water, and filler in specific amounts as the polyhydric alcohol, and the present invention has been completed.

That is, the present invention is, (a) polyethylene glycol 20 to 70 wt%, (b) water 25 to 55 wt%, and (c) contains a filler 1-30 weight%, wherein (a) polyethylene glycol 25 ° C. and a solid polyethylene glycol at 25 ° C. polyethylene glycol with a weight average molecular weight of the liquid is 20,000 to 100,000 in, and the solid polyethylene glycol with respect to polyethylene glycol 100 parts by weight of the liquid Is a dental color conformity confirmation material having a blending amount of 0.1 to 7 parts by mass.

  The dental color conformity confirmation material according to the present invention contains (b) water in a large amount of 20 to 60% by mass in addition to (a) polyhydric alcohol and (c) filler. The paste property has various properties preferable as a trial material for the above-mentioned use, and furthermore, it is extremely excellent in removability by washing with water after trial work due to the action of water.

  The (a) polyhydric alcohol contained in the dental color tone conformity confirmation material of the present invention will be described. As the (a) polyhydric alcohol in the present invention, a conventionally known compound can be used without any limitation as long as it is a water-soluble compound having at least two hydroxyl groups in the molecule. Here, that the polyhydric alcohol is water-soluble means that the solubility in water at 20 ° C. is 20 g / 100 ml or more, and it is preferably compatible with water at 20 ° C. in an arbitrary ratio. Of course, those having no hydrophobic substituents are more suitable.

  Among the polyhydric alcohols, those which are liquid at 25 ° C. are preferable because the paste has good fluidity and (c) the dispersibility of the filler is also good. Here, the liquid state at 25 ° C. means that the viscosity measured at 25 ° C. is 3,000 mPa · s or less, more preferably 2,000 mPa · s or less. If the polyhydric alcohol exhibiting such a liquid property is a polymer, its weight average molecular weight is usually 1,000 or less, and more generally 800 or less.

  Specific examples of such liquid polyhydric alcohols include propylene glycol, dipropylene glycol, polypropylene glycol (hereinafter abbreviated as “PPG”), ethylene glycol, diethylene glycol, polyethylene glycol (hereinafter abbreviated as “PEG”). Hexylene glycol, glycerin, 1,3-butylene glycol, 1,2,6-hexanetriol, ethoxylated glycerin, propoxylated glycerin and the like. You may use these individually or in mixture of 2 or more types. Of these, the value obtained by dividing the number of carbon atoms constituting the compound by the number of hydroxyl groups is preferably 0.5 to 50, more preferably 1 to 30 because it is excellent in removability in the water washing, Glycerin and PEG with the molecular weight described above are optimal.

  However, when such a liquid polyhydric alcohol is used, the obtained dental color tone conformity confirmation material is easily separated from the component and the filler component, and the paste viscosity is increased by increasing the blending amount of the filler component. Even if it raises, it will become a thing which is easy to produce a phase-separation and the bulging of a liquid component during stationary storage. In order to prevent this, (a) as a polyhydric alcohol, with respect to 100 parts by mass of the above-mentioned liquid polyhydric alcohol, a solid polyhydric alcohol is further obtained at 25 ° C. having a weight average molecular weight of 1,000 to 500,000. It is effective to add a monohydric alcohol. The blending amount is preferably 0.01 to 100 parts by mass with respect to 100 parts by mass of the liquid polyhydric alcohol.

Here, the solid state at 25 ° C. means that the viscosity measured at 25 ° C. grows at a rate of 1 mm / min by its own weight, which is the definition viscosity of the softening temperature of glass (4.5 × 10 ⁹ mPa · s In general, a polymer having a weight average molecular weight of 1,000 to 500,000 is satisfactory.

  Specific examples of such a solid polyhydric alcohol include PPG having the weight average molecular weight, PEG having the weight average molecular weight, polyvinyl alcohol having the weight average molecular weight (hereinafter abbreviated as “PVA”), and the like. It is done. Of these, it is preferable to use the same kind as the liquid polyhydric alcohol because of its good compatibility with the liquid polyhydric alcohol. Both the liquid polyhydric alcohol and the solid polyhydric alcohol are polyethylene glycol. There is optimal.

  By the way, the dissolution rate of these solid polyhydric alcohols with respect to liquid polyhydric alcohols is low. Conventionally, when trying to manufacture dental color conformity confirmation materials in such a manner, solid polyhydric alcohols are heated and melted. Therefore, the operation was very complicated (see Patent Document 2). Even when heated and dissolved in this manner, the upper limit of the weight average molecular weight can only be used below 10,000 to achieve good compatibility. Thus, with such a weight average molecular weight, the effect of suppressing the separation of the filler is not sufficiently high. Therefore, if the polyhydric alcohol is added in a large amount, the heating operation must be further prolonged. There wasn't.

  On the other hand, since the dental color tone conformity confirmation material of the present invention contains 20 to 60% by mass of water, the solids can be obtained by mixing each component at room temperature (10 to 30 ° C.). There is an advantage that the polyhydric alcohol can be easily dissolved. This high solubility has a weight average molecular weight exceeding 10,000, in particular, a weight average molecular weight excellent in the effect of suppressing the separation of the filler is 10,000 to 250,000, most preferably 20,000 to 100. Even those with 1,000,000 are well demonstrated. Since those having a large weight average molecular weight are also excellent in the effect of suppressing the separation of the filler, the blending amount can also be suppressed to a small amount (specifically, 0 with respect to 100 parts by mass of liquid polyhydric alcohol). 0.01 to 10 parts by weight, more preferably 0.1 to 7 parts by weight), and these can be easily dissolved.

  In the dental color conformity confirmation material of the present invention, the blending amount of the (a) polyhydric alcohol is 10 to 79% by mass with respect to the total mass of the dental color conformity confirmation material of the present invention. In this range, the removability by water washing after trial fitting is high, and the handleability as a dental material is excellent. Considering the further goodness of these effects, the range of 20 to 70% by mass is preferable, and the range of 30 to 63% by mass is more preferable. (A) When the blending amount of the polyhydric alcohol is less than 10% by mass, the blending amount of (b) water is relatively increased, and the liquid component and the filler component are separated. On the other hand, when the blending amount exceeds 79% by mass, the removability by washing with water decreases, and the performance as a suitable material decreases.

  In the present invention, (b) water is the most characteristic component, and as a result of blending water as described above, the dental color tone conformity confirmation material obtained has excellent removability by water washing after trial use. . Further, even when (a) a polyhydric alcohol having a high molecular weight is used, it can be easily dissolved. What is necessary is just to use what is obtained by a conventionally well-known method as such water, Specifically, industrial water, household drinking water, agricultural water, distilled water, purified water, ion-exchange water etc. are mentioned.

  In the dental color conformity confirmation material of the present invention, the amount of the water (b) is 20 to 60% by mass with respect to the total mass of the dental color conformity confirmation material of the present invention. In this range, the removability by water washing after the trial work is high, and the handleability as a dental material is excellent. In consideration of further goodness of these effects, the range of 25 to 55% by mass is preferable, and the range of 30 to 50% by mass is more preferable. (B) When the blending amount of water is less than 20% by mass, the removability by water after trial use is lowered. On the other hand, if the blending amount exceeds 60% by mass, separation between the liquid component and the filler component when stored at a standstill increases.

  Furthermore, the filler (c) used in the present invention is blended to paste the composition and impart shapeability, and limits the conventionally known inorganic filler and / or organic filler. It can be used without. Specific examples include inorganic fillers such as silicon dioxide (quartz, glass, silica, etc.), metal oxides such as alumina, ceramics, clay minerals such as diatomaceous earth, kaolin, montmorillonite, activated clay, synthetic zeolite, Examples include mica, calcium phosphate, and barium sulfate.

  Examples of organic fillers include polymethyl methacrylate (hereinafter abbreviated as PMMA), polyethyl methacrylate (hereinafter abbreviated as PMMA), polyfunctional methacrylate polymer, polyamide, polystyrene, polyvinyl chloride, chloroprene rubber, nitrile rubber, Examples thereof include organic resin particles made of styrene-butadiene rubber or the like.

  These inorganic fillers and / or organic fillers may be used alone or in admixture of two or more. These may be treated with a surface treatment agent such as a silane coupling agent.

  These (c) fillers may generally be selected from those having an average primary particle diameter in the range of 0.001 to 70 μm. Inorganic fine particles having an average primary particle diameter of 0.001 to 0.050 [mu] m, more preferably 0.001 to 0.030 [mu] m are preferable because of excellent thickening properties. In particular, metal oxides such as silica and alumina are preferable, and fumed silica is optimal. Here, the average primary particle diameter refers to a median diameter value displayed on a volume basis, measured by a laser diffraction / scattering particle size distribution measuring apparatus based on the Mie scattering theory.

  However, when only such inorganic fine particles are used as the filler (c), the film thickness when the paste is applied cannot be increased, and is an appropriate film thickness when used as a color tone conformity confirmation material. It may be difficult to achieve 50 μm, more preferably 10 to 40 μm. Therefore, in order to suppress this, (c) In the filler, further, an inorganic particle or an organic material having an average primary particle size (that is, 5 to 50 μm, more preferably 10 to 40 μm) of the required film thickness. It is preferable to blend resin particles. The blending amount is 0.01 to 10 parts by mass, and 0.02 to 8 parts by mass is particularly effective with respect to 100 parts by mass of the inorganic fine particles having an average primary particle size of 0.001 to 0.070 μm. It is.

  In the dental color conformity confirmation material of the present invention, the blending amount of the filler (c) is 1 to 30% by mass with respect to the total mass of the dental color conformity confirmation material of the present invention. In this range, the removability by water washing after the trial work is high, and the handleability as a dental material is excellent. In consideration of further goodness of these effects, the range of 5 to 25% by mass is more preferable, and the range of 7 to 20% by mass is most preferable. (C) When the amount of the filler is less than 1% by mass, it is difficult to obtain good paste properties. On the other hand, when the blending amount exceeds 30% by mass, the liquid component and the filler component are separated, and the operability is deteriorated and the removability by water after trial use is also lowered.

  The dental color conformity confirmation material of the present invention, (c) the filler is the same type as that blended with the corresponding dental cement, other pigments and the like are not blended with the dental cement, When the color tone of the two is the same as it is, there may be a case where the pigment is used without blending. Usually, since the color tone differs from the corresponding dental cement, (d) the pigment is further added to 100 parts by mass of (a) polyhydric alcohol, (b) water, and (c) filler. It is preferable to contain 0 to 0.1 parts by mass to match the same color tone as the dental cement. Examples of the pigment include bengara, phthalocyanine blue, various azo pigments, and titanium oxide. These pigments can be blended alone or in combination.

  (D) The amount of the pigment is 0 to 0.1 parts by mass with respect to a total of 100 parts by mass of the (a) polyhydric alcohol, (b) water, and (c) filler, but is sufficiently colored. From the viewpoint of exerting the effect and not affecting the blending effect of the filler, the amount is more preferably 0.0001 to 0.01 parts by mass.

  Furthermore, as necessary, a fluorescent agent, an ultraviolet absorber, an antibacterial substance, and the like may be added to the dental color tone conformity confirmation material of the present invention in an amount that does not impair the effects of the present invention.

  The dental color tone conformity confirmation material of the present invention comprising such components usually has a viscosity measured at 25 ° C. of 3,000 to 50,000 mPa · s, and more preferably has applicability and film-forming properties. The said viscosity excellent in the handleability can also be a thing of 5,000-30,000 mPa * s. Here, the viscosity is a value measured with a rotary viscometer. For example, in a CS rheometer (CSO120HR) manufactured by BOHLIN, a method of measuring using a parallel plate having a diameter of 20 mmΦ and an angle of 1 degree and increasing the Shere Stress to 100 to 10,000 Pa can be exemplified.

  As a dental color conformity confirmation material, when a prosthesis is attached to an abutment tooth, the dental color conformity confirmation material is prosthetic in advance in order to select a dental cement that exhibits an appropriate color tone after attachment. What is necessary is just to use it in the normal mode of the same material which apply | coats to a thing and temporarily tries a prosthesis for an abutment tooth, and confirms the aesthetics. After confirming the color tone, the prosthesis is removed, and the dental color conformity confirmation material adhering to the inner surface and the abutment tooth of the prosthesis may be removed by washing with water. The coating thickness of the dental color conformity confirmation material applied to the upper surface of the abutment tooth is preferably 5 to 50 μm, more preferably 10 to 40 μm.

  The present invention will be described in more detail based on examples. The present invention is not limited to the following examples.

The details of the abbreviations shown in the examples are shown in Table 1 below.
Abbreviation details

Comparative Example 6
50% by mass (50 g) of PEG200 and 40% by mass (40 g) of water were mixed in a 200 ml beaker. Next, 10% by mass (10 g) of non-surface-treated fumed silica 1 having an average primary particle size of 0.012 μm, and the pigment is 100 weights in total of the component (a), the component (b), and the component (c). 0.001 part by weight (0.1 g) was dispersed with respect to part to prepare a dental color tone conformity confirmation material. Subsequently, the water removability of the dental color conformity confirmation material prepared by the method (1) below was examined. Further, the separation of the liquid component and the filler component and the film thickness of the paste were examined by the following methods (2) and (3). The results are shown in Tables 2 and 3.
(1) Water removability of the dental color conformity confirmation material 0.2 g of the prepared dental color conformity confirmation material was placed on the bovine dentin surface and applied to the surface. Next, water was filled vertically from the bovine tooth surface at a water pressure of 0.3 MPa and a flow rate of 120 ml / min, and the residual amount of the dental color conformity confirmation material was visually observed to completely remove the dental color conformity confirmation material. The number was regarded as the value of water removability, the removal time of 3 to 4 seconds was evaluated as ◎, the one of 5 to 6 seconds as ○, and the one of 7 to 8 seconds as Δ.
(2) Separation of dental color conformity confirmation material The prepared dental color conformity confirmation material was filled in a range of 0 to 0.5 ml of a 1 ml syringe for tuberculin (trade name “Terumo Syringe”, manufactured by Terumo). After sealing the injection port with tape, it is stored in a constant temperature room at 37 ° C., and when discharged after one month, the liquid component separation is 0.2 mm or less, ○, 0.2 mm to 0.4 mm is Δ, The thing of 0.4 mm or more was judged as x.
(3) Measurement of film thickness The thickness d1 of the two Φ1.5 mm glass plates stacked is measured with a micrometer. In the center of the glass plate, 0.1 g of dental color conformity confirmation material is placed. The sample is sandwiched between another glass plate and a 15 kg weight is immediately applied. After 3 minutes from the start of application, the glass plate is taken out and the thickness d2 is measured. Note that the thickness is an average value of a total of 5 points including the center and 4 points on the outer periphery, and d2-d1 is the film thickness of the sample.
(4) Comprehensive evaluation As for the method of comprehensive evaluation, if there is an item of △ even if one of the evaluation of the removal time and the separation of the liquid component and the filler component, the comprehensive evaluation is △, and at least one of the items is ×. In some cases, the overall evaluation was x. In addition, any evaluation item was (circle) and the film thickness was 10-25 micrometers, and evaluated as (double-circle).
Comparative Examples 7-21, Examples 5, 6, 10, 13-21, 24-27, 29
Comparative Examples 7-21, Examples 5, 6, 10, 13-21, 24-27, 29
Prepared the dental color tone conformity confirmation materials shown in Tables 2 and 3 in the same manner as in Comparative Example 6 and evaluated them. The results are shown in Tables 2 and 3.
Comparative Example 1
90 wt% (90 g) of water was prepared in a 200 ml beaker. Next, 9.5 mass% (9.5 g) of average primary particle size fumed silica 1 and 0.5 mass% (0.5 g) of PMMA1 were added, and the pigment was added as component (a), component (b), and ( c) 0.001 mass part (0.1g) was disperse | distributed with respect to a total of 100 mass parts of a component, the dental color tone conformity confirmation material was prepared, and the evaluation was performed. The results are shown in Table 3.
Comparative Examples 2-5
Comparative Examples 2 to 5 prepared dental color tone conformity confirmation materials shown in Table 2 in the same manner as Comparative Example 1, and evaluated the materials. The results are shown in Table 3.

Comparative Examples 6-21, Examples 5, 6, 10, 13-21, 24-27, 29
All had a comprehensive evaluation of Δ or more. In Comparative Example 1, by separating the liquid component from the (a) polyhydric alcohol and using only (b) water, the separation between the liquid component and the filler component was increased, and the overall evaluation was x. In Comparative Example 2, (b) water was not added and (a) only PEG200 and PEG35,000 were used, so that the removal time was 12 seconds and the overall evaluation was x. In Comparative Example 3, (a) 5% by weight of PEG200 and PEG35,000, (b) 85% by weight of water, that is, (a) and (b) outside the scope of claims were added, and (c) filling When the materials were fumed silica 1 and PMMA 2 at 10% by weight, the separation of the liquid components increased, and the overall evaluation was x. In the system of Comparative Example 4 where (c) filler was not added, paste properties could not be obtained, evaluation of each item could not be performed, and the overall evaluation was x. In Comparative Example 5, the liquid components were (a) 50% by weight of PEG200 and PEG35,000, (b) 10% by weight of water, and (c) the filler was 40% by weight of fumed silica 1 and PMMA2. By adding (b) and (c) outside the stated range, the paste properties deteriorated, the removal time was 13 seconds, and the overall evaluation was x.

Claims (5)

(A) polyethylene glycol 20 to 70 wt%, (b) water 25 to 55 wt%, and (c) contains a filler 1-30 weight%, wherein (a) liquid polyethylene glycol in the polyethylene glycol 25 ° C. And a polyethylene glycol that is solid at 25 ° C. having a weight average molecular weight of 20,000 to 100,000, and the solid polyethylene glycol is 0.1 to 7 with respect to 100 parts by mass of the liquid polyethylene glycol. Dental color conformity confirmation material that is the blending amount of parts by mass. (C) The dental color tone conformity confirmation material according to claim 1 , wherein inorganic fine particles having an average primary particle diameter of 0.001 to 0.070 μm are used as the filler. (C) Further, as the filler, inorganic particles or organic resin particles having an average primary particle diameter of 10 to 50 μm are added to 0.01 parts by mass with respect to 100 parts by mass of the inorganic fine particles having an average primary particle diameter of 0.001 to 0.070 μm. The dental color tone conformity confirmation material according to claim 2, wherein the material contains 10 to 10 parts by mass. Further, (d) is a pigment, (a) polyethylene glycol, (b) water, and (c) comprising a 0-0.1 parts by weight per 100 parts by weight of the filler according to claim 1 to 3 The dental color tone conformity confirmation material according to any one of the above. Dental color conformity characterized by mixing at least each component consisting of (a) 20-70% by weight of polyethylene glycol , (b) 25-55% by weight of water, and (c) 1-30% by weight of filler. 100 parts by mass of the confirmation material production method (a) polyethylene glycol which is liquid at 25 ° C., and 0.1 to 7 which is solid at 25 ° C. having a molecular weight of 20,000 to 100,000 The manufacturing method of the dental color-conformity confirmation material which is a mixture with a mass part .