JP2013095665A - Dental alginate impression material composition - Google Patents

Abstract

【Task】
The present invention is a dental alginate impression material that has improved the strength (specifically, crush resistance and tear strength) of a cured impression material while maintaining high elastic strain, which is one of the advantages of an alginate impression material. It is an issue to provide.
[Solution]
A dental alginate impression material composition containing a fibrous organic filler, preferably a fine fibrous organic filler obtained by fibrillation with respect to a dental alginate impression material, the fibrous organic filler The filler content is preferably 1 to 20 parts by mass with 100 parts by mass of the entire alginate impression material composition.
[Selection figure] None

Description

  The present invention relates to a dental alginate impression material composition, and in particular, to a dental alginate impression material composition containing a fibrous organic filler as at least a part of a filler component.

  When a cast crown restoration treatment or a defect prosthesis treatment or the like is required to restore a tooth or the like, i) first take a mold such as an abutment tooth, and ii) then the obtained die Iii) A prosthesis is produced based on the produced model, and the produced prosthesis is attached to an abutment tooth or the like. The mold such as the abutment tooth is referred to as an impression, and a curable material for obtaining the impression is referred to as an impression material. As this impression material, an alginate impression material, an agar impression material, a silicone rubber impression material, a polysulfide rubber impression material, a polyether rubber impression material, or the like is used. Here, silicone rubber impression material, polysulfide rubber impression material, polyether rubber impression material, etc. have the advantage of high strength and low elastic strain or permanent set. When taking an undercut in the inside or dentition, or when taking a wide range of impressions, the hardened body has a small elastic strain, which makes it difficult to remove from the tooth after taking the impression, and in some cases tooth extraction Sometimes. For this reason, when an impression having a rocking tooth or undercut is taken, an alginate impression material having a large elastic strain and allowing easy removal of the cured impression body is preferably used.

  The following procedure is used to obtain an impression using an alginate impression material. i) An impression tray simulating a dentition is provided with a mixture of the components constituting the alginate impression material. ii) A tray with impression material is pressed against the teeth so as to wrap the teeth in the oral cavity. iii) After the alginate impression material is cured, the alginate impression material and the tray are integrally removed from the tooth and removed from the oral cavity. iV) After removal, plaster is placed on a dental mold made of a cured alginate impression material to prepare a denture model.

  Alginate impression material consists of alginate, gelling reaction agent such as gypsum, and filler such as silica filler and diatomaceous earth. By adding a large amount of water to this mixture, calcium ions are eluted from gypsum. The alginate is cured by reacting with calcium ions.

  However, the alginate impression material has a large elastic strain and can be easily removed, but has a drawback that the impression cured body is weak. If the strength of the impression material cured body is insufficient, the cured body may be broken or peeled off at a portion where the impression material becomes thin, such as a margin portion, and an accurate impression may not be obtained, and improvement has been demanded.

  Under these circumstances, for the purpose of improving the strength of the impression cured body and the operability at the time of collection, it has been proposed and used to contain inorganic fillers such as diatomaceous earth, silica, talc, and sepiolite ( Patent documents 1, 2, 3).

Japanese Patent Laid-Open No. 10-139618 JP-A-10-194909 JP 2000-53520 A

  However, the above-described prior art has the following problems. When fillers such as diatomaceous earth and silica proposed in the prior art are added, the strength of the cured impression material is improved, but the effect is not always sufficient in areas such as margin areas where the impression material is thinned. . If sufficient strength is obtained, the blending amount increases, the strength is improved, the cured body is hardened, and the elastic strain is reduced.

  The present invention has been made in view of the above circumstances, and is a dental that has improved the strength of a cured impression material while maintaining high elastic strain, which is one of the advantages of an alginate impression material, which has been difficult with conventional measures. It is an object to provide an alginate impression material for use.

  As a result of intensive studies to solve the above problems, the present inventor has come to solve the above problems by using a dental alginate impression material composition containing a fibrous organic filler.

  That is, this invention is a dental alginate impression material composition characterized by including a fibrous organic filler.

  ADVANTAGE OF THE INVENTION According to this invention, compared with the conventional alginate impression material, the alginate impression material composition which the intensity | strength of the hardening body improved significantly, maintaining a high elastic strain can be provided. This makes it easy to remove the cured impression material from the tooth, even when the impression or the dentition has an undercut or when the impression target tooth contains a fluctuating tooth. The impression material cured body is prevented from tearing or peeling off at a portion where the impression material becomes thin, such as a portion, and a highly accurate impression can be obtained, which is extremely useful.

-Fibrous organic filler-
By including a fibrous organic filler in the alginate impression material, the strength of the cured product can be significantly improved while maintaining the high elastic strain characteristic of the alginate impression material. The reason for this is not clear, but the fibrous organic filler tends to be entangled with each other when the alginate impression material is kneaded. That is, in the dental alginate impression material of the present invention, it is considered that the strength of the cured product is improved more than expected as a result of such fiber entanglement. Further, since the fibrous organic filler has flexibility unlike the granular filler, it is considered that the fibrous organic filler does not adversely affect the elastic strain.

  Here, even if the same fibrous filler is used, the use of the same shape of inorganic filler is not preferable because the elastic strain is greatly reduced at the same time although a certain improvement in strength is observed.

  The fibrous organic filler used in the present invention is not particularly limited as long as the shape thereof is an organic filler having a fibrous shape, and known ones can be used. The “fibrous” described above means that the average length of the fibers is 50 times or more, preferably 80 to 3000 times the average diameter of the fibers. In general, the average fiber diameter is preferably 100 μm or less, and the average fiber length is preferably 10 mm or less.

  Specific examples of such fibrous organic fillers include cellulose, polyamide, aramid, polyester, polyaramid, acrylic, vinyl, modacrylic, polyolefin, polytetrafluoroethylene, and the like. These fibrous organic fillers can be used in combination of two or more. Of these, cellulose is preferred because it has a high strength-improving effect, and is easily bioavailable and easily available.

  In the present invention, the fibrous organic filler described above is preferably a fine fiber because the effect of improving the strength is particularly remarkable. Specifically, the average fiber diameter is preferably in the range of 0.005 to 2 μm, more preferably in the range of 0.01 to 1 μm. Such a fine fiber-like thing is considered that a contact area with an alginate impression material improves, and an intensity | strength improves further by an anchor effect. Such a fine fibrous organic filler can be obtained by finely pulverizing the fibrous organic filler with a mechanical shearing force such as a high-pressure homogenizer and so-called fibrillation (microfibrillation).

  As such fibrillated fibrous organic filler, commercially available products such as “Cerish (product name)” and “Tiara (product name)” manufactured by Daicel Corporation can be preferably used.

  The average fiber diameter and average fiber length were measured with a laser microscope, and the diameter and fiber length of 100 fibers arbitrarily selected from those in focus throughout the fiber length were measured. It can be measured by determining the value.

  Although content of the said fibrous organic filler with respect to an alginate impression material is not specifically limited, It is preferable that it is 1-20 mass parts by making the whole alginate impression material composition into 100 mass parts. More preferably, it is 5-10 mass parts. When the blending amount of the fibrous organic filler is less than 1 part by mass, the strength of the impression material cured body tends to be lowered.

-Alginate impression material-
In the present invention, the alginate impression material containing the fibrous organic filler is not limited to a known material composed of a base material mainly composed of alginate and a hardener mainly composed of calcium sulfate. Used without. As a specific type of alginate impression material, a powder type in which water is mixed with a powder mainly composed of alginate and calcium sulfate, or a base paste composed mainly of alginate, and calcium sulfate as a main component The paste type which mixes and uses the hardening material paste to be mentioned.

  More specifically, powder-type alginate impression materials include alginates such as potassium alginate and sodium alginate; calcium sulfate dihydrate (dihydrate gypsum), calcium sulfate hemihydrate (hemihydrate gypsum), calcium sulfate anhydrous salt ( Gelling reaction agents such as anhydrite); more usually, gelation regulators such as trisodium phosphate and sodium pyrophosphate; fillers such as silica and diatomaceous earth; inorganic compounds such as zinc oxide, magnesium oxide and potassium titanium fluoride (Curing Accelerator) is a powder mixture containing as a main component, and a dentist or dental hygienist mixes a specified amount of impression material powder and water just before use to make a paste. Used for taking impressions. The powder mixture may be a storage form in which all of the above ingredients are blended, but is a storage form that is packaged in two or more packages and mixed at the time of use to form the powder mixture. Also good.

  On the other hand, the paste type impression material is a base paste made into a uniform paste in advance by kneading the alginate, filler and water, a gelation reaction material and a gelation modifier, a filler, an inorganic compound, Is a paste made with a hydrophobic solvent, and is kneaded and mixed with each other in a specified amount just before use to make a uniform paste and used for taking an impression.

  Of these powder types and paste types, the paste type is particularly preferred because it is easy to save and automate the kneading work by using it together with the kneading apparatus. In the case of such a paste type, the fibrous organic filler can be contained in either the base paste or the hardener paste or both. When using the alginate impression material, the base paste and the curing material paste are kneaded and used. Kneading can be carried out manually, but it is advantageous to use a dedicated kneading apparatus from the viewpoint of labor saving and automation of the kneading work as described above. Further, the mixing ratio of the base paste and the hardener paste is not particularly limited, but usually the hardener paste is 1 part by weight, and the base paste is in the range of 1 part by weight to 4 parts by weight. It is preferable to be within. Further, these two types of pastes are usually sealed and stored using a known storage member such as a packaging bag such as an aluminum pack or a storage container in order to ensure storage stability.

  Moreover, in the case of a powder type, a fibrous organic filler should just contain a fibrous organic filler in the said powder mixture or its package. When using such a powder type alginate impression material, powder and water are kneaded and used immediately before use. Here, water may be added to the product package as a separate package from the powder component constituting the alginate impression material, but it is usually preferred that the user of the alginate impression material be appropriately procured. Moreover, you may use the aqueous solution which melt | dissolved the various additive mentioned later instead of water. In this case, an aqueous solution of the additive is added to the product package of the alginate impression material in addition to the powder component. The fibrous organic filler may be dispersed in such water or an aqueous additive solution.

-Additives-
In addition to the components described above, various additives can be blended in the alginate impression material of the present invention as necessary. Examples of the additive include a surfactant, an amino acid compound, an unsaturated carboxylic acid polymer, a fragrance, a colorant, an antibacterial agent, a preservative, and a pH adjuster. These additives may be incorporated in any package of powder type or paste type alginate impression materials.

-Manufacturing method-
It does not specifically limit as a manufacturing method of the alginate impression material of this invention, A well-known manufacturing method can be suitably selected according to the form by which an alginate impression material is provided on the market. For example, when the alginate impression material is a powder cake type, a uniform and non-uniform powder can be obtained by mixing and stirring the components constituting the powder in an arbitrary order. Moreover, when a powder type alginate impression material also has an additive aqueous solution in addition to the powder, each additive component other than water constituting the additive aqueous solution can be dispersed and dissolved in water in any order.

  Moreover, when the alginate impression material of this invention is a paste type, a base material paste and a hardening material paste can be manufactured using the well-known stirring mixer which can be utilized for paste manufacture. Here, as the stirring mixer, for example, a rotating container type mixing and kneading machine such as a ball mill, a ribbon mixer, a kneader, an internal mixer, a screw mixer, a Henschel mixer, a universal mixer, a Ladige mixer, a butterfly mixer, A fixed container type mixing and kneader having a horizontal axis or a vertical axis such as the above can be used. Furthermore, when manufacturing the base paste and the curing material paste, two or more kinds of the above-described various mixing kneaders can be used in combination.

-Usage of alginate impression material-
When using the alginate impression material of the present invention, generally, after preparing a kneaded material from at least the alginate impression material, the kneaded material is placed on a dedicated tray. And the impression is extract | collected by press-contacting the kneaded material put on the tray to target objects, such as a tooth | gear. Thereafter, after the kneaded material from which the impression has been collected is cured to become a cured product, a post-process such as making a plaster model based on the cured product is further performed. Here, a well-known tray can be used as the tray without limitation, but a metal tray or a resin tray is generally used. Examples of the metal tray material include stainless steel, tin alloy, aluminum, brass that is plated or resin-coated, and the like. Examples of the material for the resin tray include polymethacrylate.

The present invention will be described below in more detail with reference to examples. However, the present invention is not limited to the following examples.
<< Abbreviations for raw materials >>
Abbreviations of various raw materials used in the production of the alginate impression materials of Examples and Comparative Examples described below are as follows. In addition, the average fiber diameter and the average fiber length were measured using a laser microscope (“VK-9710” manufactured by Keyence Corporation), and an average value obtained by measuring 100 fibers arbitrarily selected from those in focus throughout the fiber length. did.

1. Fibrous organic filler
A: Polyaramid Average fiber diameter: 90 μm, Average fiber length: 9.0 mm
B: Cellulose fiber Average fiber diameter: 40 μm, Average fiber length: 4.0 mm
C: fibrillated cellulose Average fiber diameter: 0.9 μm, average fiber length: 1.0 mm
D: Fibrilized cellulose Average fiber diameter: 0.3 μm, Average fiber length: 0.5 mm
E: Fibrilized cellulose Average fiber diameter: 0.05 μm, Average fiber length: 0.1 mm
2. Other filler
F: Diatomaceous earth
G: Polymethylmethacrylate filler: average particle size 20 μm, weight average molecular weight = 800,000
H: Sepiolite (fibrous inorganic filler): average fiber diameter: 0.4 μm, average fiber length: 0.5 mm
2. Alginate impression material paste type Alginate impression material used:
Weigh out 4 g of dihydrate gypsum, 9 g of anhydrous gypsum, 3.2 g of magnesium oxide, 6 g of liquid paraffin, 1 g of surfactant (decaglyceritriolate), 0.3 g of trisodium phosphate, and 3 g of diatomaceous earth. A curing material paste having the composition shown in Table 1 was prepared and kneaded using a container “Spincle II” (Morita). Furthermore, 3.5 g of potassium alginate, 60 g of purified water, and 10 g of diatomaceous earth were weighed and kneaded using a small kneader for impression material, and a base paste having the composition shown in Table 1 was prepared and used.

Powder type alginate impression material:
Powder A: Commercial product A
Powder material B: Commercial product B
Powder C: Commercial product C
<< Evaluation Method and Evaluation Criteria >>
Evaluation methods and evaluation methods of “elastic strain”, “crush resistance”, and “tear strength” for the samples of Examples and Comparative Examples described later are as follows.

(1) Elastic strain:
A cylindrical mold A having an inner diameter of 31 mm, an outer diameter of 38 mm, and a height of 16 mm is placed on an acrylic plate and filled with an impression material kneaded material. The cylindrical mold B was inserted and the upper surface was pressed with another acrylic plate to start the stopwatch. After 14 minutes, the cured impression material sample (13 mmφ × 20 mm) was removed from the mold B, and set in a compression tester (“PEACOCK” product name) manufactured by Seiki. After 15 minutes, the compression test was started according to the following procedure. First, a load of 100 gf / cm ² is applied, the stopwatch is started, and the dial gauge when 30 seconds have elapsed is read (A). At 60 seconds, a load is gently applied until 70 seconds so that the total weight becomes 1000 gf / cm ^2, and the dial gauge at 100 seconds is read (B). The elastic strain (εe) was obtained from the following equation from the A and B values. In addition, the same test was performed 3 times and the average value was made into elastic strain.

Elastic strain (εe) = (A−B) / 20 × 100 (%)
(2) Shatter resistance:
A cylindrical mold A having an inner diameter of 31 mm, an outer diameter of 38 mm, and a height of 16 mm is placed on an acrylic plate and filled with an impression material kneaded material. The cylindrical mold B was inserted and the upper surface was pressed with another acrylic plate to start the stopwatch. After 4 minutes, the impression material cured body sample (13 mmφ × 20 mm) was removed from the mold B, and set in a variety of constant load compression tester manufactured by Seiki. When 5 minutes passed, a load of 5 kg was applied to confirm whether the cured body was crushed. The same test was repeated except that the load was increased by 1 kg, and the evaluation was completed when the cured impression material was crushed. The load immediately before the cured impression material was crushed was measured. The measurement was performed three times, and the average value was taken as the crushing resistance.

(3) Tear strength:
The impression material kneaded product was poured into a JIS-3 dumbbell-shaped mold defined in JIS K6253, pressed with an acrylic plate, and after 15 minutes, the cured impression material was removed from the mold to prepare five test pieces. Using a Shimadzu autograph, the tear strength at break was measured at a load cell capacity of 5 kgf and a crosshead speed of 10 mm / min. The tear strength was the average of the measured values.

<Evaluation of paste type alginate impression material>
Example 1
22.5 g of the hardener paste shown in Table 1, 62.5 g of the base paste shown in Table 1, and 15 g of the fibrous organic filler A were weighed and kneaded using a small kneader for impression material. The kneaded product was used to evaluate the elastic strain, crush resistance and tear strength of the cured product. The impression material composition and results are shown in Table 2. The results show that good crushing resistance and tear strength can be obtained while maintaining the high elastic strain of the alginate impression material.

(Example 2 to Example 9)
Except for using the impression material having the composition shown in Table 2, the elastic strain, crush resistance and tear strength of the cured body were evaluated by the same method as in Example 1. The results are shown in Table 2. In any case, the crushing resistance and tear strength were significantly improved as compared with Comparative Example 1 while maintaining the high elastic strain of the alginate impression material.

(Comparative Examples 1 to 4)
Except using the impression material having the composition described in Table 3, the elastic strain, crushing resistance and tear strength of the cured body were evaluated by the same method as in Example 1. The results are shown in Table 3.

  Comparative Example 1 is an example in which the fibrous organic filler that is a requirement of the present invention was not blended in the impression material of Example 1, except that the elastic strain showed a good value, and the crushing resistance and tear strength Decreased.

  Comparative Example 2 is an example in which a non-fibrous inorganic filler is blended in place of the fibrous organic filler which is a requirement of the present invention in the impression material of Example 1, but a rigid body is obtained. However, the softness characteristic of the alginate impression material is lost, and the elastic strain is greatly reduced. Also, the tear strength was greatly reduced.

  Comparative Example 3 is an example in which a non-fibrous inorganic filler is blended in place of the fibrous organic filler which is a requirement of the present invention in the impression material of Example 1, but not sufficient cured body strength cannot be obtained. The tear strength was greatly reduced.

  Comparative Example 4 is an example in which a fibrous inorganic filler is blended in place of the fibrous organic filler that is a requirement of the present invention, but a hardened body is obtained, but the softness that is a characteristic of the alginate impression material is obtained. And the elastic strain is greatly reduced. Also, the tear strength is greatly reduced.

<Evaluation of powder type alginate impression material>
(Example 10)
30 g of powder type alginate impression material A, 55 g of water and 15 g of fibrous organic filler D were weighed and kneaded using a small kneader “Spinkle II” (Morita) for impression material. The obtained kneaded product was used to evaluate the elastic strain, crushing resistance and tear strength of the cured product. The impression material composition and the evaluation results are shown in Table 2. The results were that the crushing resistance and tear strength were greatly improved as compared with Comparative Example 1 while maintaining the high elastic strain of the alginate impression material.

(Example 11 to Example 12)
Except for using the impression material having the composition described in Table 2, the elastic strain, crush resistance, and tear strength of the cured body were evaluated by the same method as in Example 10. The results are shown in Table 2. In any case, the crush resistance and tear strength were greatly improved as compared with Comparative Example 1 while maintaining the high elastic strain of the alginate impression material.
(Comparative Example 5 to Comparative Example 10)
Except using the impression material having the composition described in Table 3, the elastic strain, crushing resistance and tear strength of the cured body were evaluated by the same method as in Example 10.

  Comparative Examples 5 to 10 are cases where the requirements of the present invention were not satisfied, as in Comparative Examples 1 to 4, but in either case, the desired effect was not obtained.

Claims (4)

  A dental alginate impression material composition comprising a fibrous organic filler.   The dental alginate impression material composition according to claim 1, wherein the fibrous organic filler is a fine fiber having an average fiber diameter of 0.01 to 1 μm.   The dental alginate impression material composition according to claim 1 or 2, wherein the fibrous organic filler is made of cellulose.   The dental alginate impression material composition according to any one of claims 1 to 3, wherein the content of the fibrous organic filler is 1 to 20 parts by mass with 100 parts by mass of the entire alginate impression material composition.