JPH07227315A - Interdental brush - Google Patents

Abstract

PURPOSE:To achieve an improvement in durability and safety by using a metal wire made of a Co alloy as a metal wire of an interdental brush in which the metal wire is folded in two and a plurality of bundles of filament are pinched between the wires to fasten the bundles of filament with the metal wire by twisting it. CONSTITUTION:This interdental brush 1 is made up of a wire rod part 2 and a plurality of brushes 3 mounted on the tip side of the wire rod part 2 in the direction orthogonal to the wire rod part 2. In the formation of the wire rod part 2, a metal wire 5 with a fine diameter comprising a Co alloy is folded in two, and then, the metal wire 5 is twisted at a specified pitch in a spiral manner. The brushes 3 is a twisted bristle type in which a plurality of bundles of filament comprising synthetic fibers or natural fibers are pinched with the metal wire 5 folded in two and the metal wire 5 is twisted to fasten them. The metal wire 5 is made of the Co alloy and contains 30-60wt.% of Co.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interdental brush used for cleaning an interdental portion where it is difficult to clean plaque by ordinary toothbrushing.

[0002]

2. Description of the Related Art As an interdental brush of this type, conventionally, a plurality of filaments made of a bundle of synthetic fibers or natural fibers are sandwiched between two folded metal wires, and the metal wires are twisted to prevent the filaments from being twisted. Interdental brushes are known. The interdental brush has a structure including a wire rod portion formed by twisting (twisting) a metal wire and a brush including a plurality of filaments protruding in a direction orthogonal to the wire rod portion. ,
By moving the wire rod portion into and out of the gap between the teeth, the side surface portion of the tooth and the root portion of the tooth can be polished by the brush that moves together with the wire rod portion. Since this type of interdental brush is used in a corrosive environment such as the mouth of the human body where various salts, acids, and bacteria are present, the metal wire material used for the interdental brush has excellent corrosion resistance. A metallic material is used. Furthermore, since the interdental brush is used by inserting it into a slight gap between teeth and is repeatedly used, the metal wire requires a certain degree of rigidity and strength and repeated fatigue strength. . Further, when manufacturing a so-called twist-implanted interdental brush having a structure in which the filament is twisted by twisting the metal wire and the filament is bristled, the metal wire is extended by about 20 to 30% when twisting. From this point, a metal material having high ductility is suitable as the material of the metal wire.

From such a background, the metal wire used in the conventional interdental brush is generally known as Fe-18Cr-8N, which is known as a material having ductility, high corrosion resistance and high strength.
i is composed of 18-8 stainless steel.

[0004]

However, metallic materials having high ductility generally have low mechanical strength such as tensile strength, Young's modulus or hardness, and tend to have low rigidity.
In addition, in recent years, there has been a tendency to reduce the diameter of the metal wire in order to improve the ability of the interdental brush to pass through the gingiva.By using a metal wire with a small diameter, the rigidity of the wire rod and the repeated bending fatigue strength can be improved. Has a problem that the strength of conventional stainless steel materials is becoming insufficient. Therefore, since an interdental brush using a stainless steel metal wire of this kind has a small rigidity such as bending, the wire rod part bends when it is inserted into a slight gap between teeth. It was easy and difficult to use. Furthermore, when inserting the brush into the gap between the teeth, if the insertion method is not good, the bent wire rod portion may damage the gums. In addition, since the conventional stainless steel wire rod portion has low repeated bending strength, the wire rod portion is likely to be broken by repeated use, resulting in a short product life.

For the purpose of solving these problems, as shown in FIG. 6, the brush portion 20 is made of a resin supporting rod 2.
There is known an interdental brush 23 which is attached to the tip portion 22 of No. 1 and is constituted by narrowing the tip portion 22 of the support rod 21. In the interdental brush 23 of this configuration, a thinly squeezed tip portion 22 is formed at the tip of the support rod 21 to give flexibility to the tip of the support rod, so that the bending performance of the brush portion 20 is further enhanced. Although it is configured to be excellent in the contact state of the brush portion 20 with the gingiva and the feeling of insertion of the brush portion 20 with respect to the interdental gap, it has not been able to fundamentally solve the above-mentioned conventional problems. The current situation.

The present invention has been made in view of the above circumstances, and it is possible to improve the bending strength or bending rigidity of the wire rod portion and the repeated bending life, and improve the usability, durability and safety of the interdental brush. It is also intended to provide.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a filament of synthetic fiber or natural fiber positioned between metal wires folded in half is twisted by the metal wire. An interdental brush having a structure in which a brush made of a filament is attached to a wire rod portion formed by twisting a metal wire, the metal wire being formed of a Co alloy.

[0008]

A metal wire made of a Co alloy is used as a metal wire for an interdental brush having a structure in which a metal wire is folded in two and a plurality of filament bundles are sandwiched between them, and the filament bundle is twisted with the metal wire to form a brush. By using, the rigidity is superior to that using the conventional stainless steel metal wire, and the repeated bending fatigue life is extended. Further, the rigidity of the metal wire is improved, and the rigidity of the wire rod portion formed by twisting the metal wire is improved, so that the wire rod portion is less likely to bend when the brush is inserted into the gap between the teeth. As a result, the bent wire rod eliminates the risk of damaging the gingiva and improves safety. Furthermore, since the Co alloy wire rod portion is superior to the conventional stainless steel in repeated bending fatigue strength, the wire rod portion is less likely to break even after repeated use. Further, if it is a Co alloy, there is no problem in terms of familiarity with a living body, and it is also excellent in corrosion resistance and durability as an intraoral product.

C that constitutes the metal wire of the wire rod portion
When an alloy containing Co in an amount of 30 to 60% by weight is used as the o alloy, an interdental brush having high bending strength, high cyclic fatigue resistance, and good twisting workability can be obtained. Further, by setting the diameter of the metal wire to a value of 0.2 to 0.35 mm, the wire rod portion has a thickness that is easily inserted into the gap between the teeth, has a moderately high rigidity, and is resistant to repeated bending fatigue. can get. Therefore, the durability of the interdental brush is improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an interdental brush according to an embodiment of the present invention. An interdental brush 1 of this example has a wire rod portion 2 and a wire rod portion 2 on the tip side of the wire rod portion 2.
And a plurality of brushes 3 mounted in a direction orthogonal to the. The wire rod portion 2 has a C described later.
It is formed by folding a small diameter metal wire 5 made of an o alloy into two and then twisting the metal wire 5 at a predetermined pitch so as to be spiral. The brush 3 is of a twist-implanted type in which a bundle of a plurality of filaments made of synthetic fibers or natural fibers is sandwiched between the two folded metal wires 5 and the metal wires 5 are twisted to be fixed.

The metal wire 5 is made of a Co alloy, preferably an alloy containing Co in an amount of 30 to 60% by weight. In this Co alloy, the Co content is 3
If it is lower than 0% by weight, the bending strength and the repeated bending fatigue properties are deteriorated, which is not preferable, and the Co content is 60%.
When the value is more than the weight%, the wire is easily broken during the twisting process of the wire and the non-defective rate is lowered, which is not preferable.
The Co alloy is used as the constituent material of the metal wire 5,
This is because the wire is stretched during the process of performing the twist-planting process in the manufacturing process of the interdental brush, so that the elongation of 30% or more is necessary to withstand the twist-planting process.

Preferred Co alloys for forming the metal wire 5 include Co, Cr, Ni, Mo, C, Mn,
The elements are added with necessary amounts of elements such as Si, W, Fe and Ti. As a specific system, a Co-Cr-Ni system alloy,
Co-Cr-Mo system alloy, Co-Cr-W-Ni system alloy, C
o-Ni-Cr-Mo alloy, Co-Ni-Cr-Mo-WF
Examples thereof include e-based alloys. Further, in the Co-Cr-Ni-based alloy, Cr is 20 to 23% by weight and Ni is 15 to
It is preferable to contain about 18% by weight. Furthermore, Co
In the -Cr-Mo alloy, it is preferable to contain 27 to 30% by weight of Cr and 5.0 to 7.0% by weight of Mo, and optionally 2.5% by weight or less of Ni,
Fe may be contained in an amount of 7.5% by weight or less.

In the Co-Cr-W-Ni system alloy, C
r is 19 to 21% by weight, Ni is 9.0 to 11.0% by weight,
W is preferably contained in an amount of 14 to 16% by weight, and optionally, Fe may be contained in an amount of 3% by weight or less, Mn in an amount of 2.0% by weight or less, and Si in an amount of 1.0% by weight. Co-
In the Ni-Cr-Mo alloy, Cr is 19 to 21% by weight, Ni is 33 to 37% by weight, and Mo is 9.0 to 10.5.
It is preferable that the content of Fe be 1% by weight, if necessary,
% By weight and 1% by weight of Ti may be contained. Co-Ni-
In a Cr-Mo-W-Fe based alloy, Cr is 18 to 2
It is preferable to contain 2% by weight, 15 to 25% by weight of Ni, 3 to 4% by weight of Mo, 3 to 4% by weight of W, and 4 to 6% by weight of Fe, and if necessary, 1% of Mn. % Or less, T
It may contain i in an amount of 0.5 to 3.5% by weight and Si in an amount of 0.5% by weight or less.

As a more specific Co alloy, Co
30 to 45% by weight, Ni 10 to 20% by weight, Cr 8 to 15% by weight, Mo 3 to 12% by weight, C 0.08.
%, P is 0.08% by weight, P is 0.045% by weight, S is 0.03% by weight, and SPRON100 (commercial name of Seiko Electronic Components Co., Ltd.) having the composition of the balance Fe is used. You can Further, SPRO containing Co of 25 to 45% by weight, Cr of 12 to 25% by weight, and Mo of 8 to 15% by weight, and the balance of Ni.
N500 (trade name manufactured by Seiko Electronic Components Co., Ltd.) can be used. Furthermore, Co is 40% by weight or more and Ni is 1
5 to 17.5% by weight, Cr 20.5 to 22.5% by weight,
NAS604PH (trade name, manufactured by Nippon Yakin Kogyo Co., Ltd.) containing 5.8 to 8.3% by weight of Mo and having the composition of the balance Fe can be used.

Next, in the interdental brush 1 having the above structure,
The metal wire 5 preferably has a diameter of 0.2 to 0.35 mm. When the diameter of the metal wire 5 exceeds 0.35 mm, the diameter of the wire rod portion 2 becomes too large and it becomes difficult to insert it into the gap between the teeth, and
If the value is less than 0.2 mm, the rigidity becomes insufficient and the wire rod portion 2 is easily deformed, which is not preferable.

In the interdental brush 1 having the above structure, since the metal wire 5 is made of a Co alloy, the rigidity of the wire rod portion is higher than that of the conventional interdental brush using the metal wire made of 18-8 stainless steel. It is possible to obtain an interdental brush 1 having high durability and long fatigue life. In addition, the Co alloy metal wire 5 is excellent in compatibility with a living body, has no risk of causing an allergic reaction, and has excellent corrosion resistance. Next, if the Co content is set to 30 to 60% by weight, a high bending strength can be sufficiently obtained, and the interdental brush 1 is excellent in repeated bending fatigue strength and excellent in workability during twisting. Can be obtained. Furthermore, by setting the diameter of the metal wire in the range of 0.2 to 0.35 mm, the interdental brush 1 including the wire rod portion 2 having a diameter that is easily inserted into the gap between the teeth, has high bending strength, and is difficult to bend Can be obtained.

Next, an example of a method of manufacturing the interdental brush 1 having the above structure will be described. First, the metal wire 6 shown in FIG. 2 (a) having the composition described above and having the thickness range described above is prepared, and the curl is straightened by a straightening machine composed of the rollers 7 ... And the die 7 ′. Cut to the required length. Next, FIG.
The metal wire 6 cut as shown in (b) is folded back,
In the meantime, a plurality of filaments 8 such as hairs are inserted as shown in FIG. 2 (c), and then twisted by a twisting machine 9 equipped with a rotatable chuck as shown in FIG. 3 (a). Then, as shown in FIG. 3 (b), a brushing process is performed to form a brush 8 ', and finally a plastic base 4 shown in FIG. 3 (c) is formed by a molding method such as insert molding. The interdental brush finished product can be obtained by integrating.

[Test Example] In Table 1, as a material for forming the metal wire 5 of the interdental brush 1 having the above-mentioned structure, Co-21Cr-1 is used.
An alloy having a composition of 7Ni, an 18-8 stainless steel having a composition of Fe-18Cr-8Ni (having a composition of 18% by weight of Cr, 8% by weight of Ni, and the balance of Fe) and various other materials are used. The relationship between bending strength and cyclic bending fatigue strength is shown. In addition, in Table 1,
SPRON100 is a Co-Cr-Ni alloy of the above composition manufactured by Seiko Electronic Components Co., Ltd., SPRON500 is a Co-Cr- alloy of the above composition manufactured by Seiko Electronic Components Co., Ltd.
The Ni-based alloy, NAS604PH, is a Co-Cr-Ni-based alloy manufactured by Nippon Yakin Kogyo Co., Ltd. having the above-described composition.

In Table 1, the bending strength test shows that the diameter is 0.2.
A 5 mm metal wire is twisted at a pitch of 0.4 to 0.6 mm, and a brush made of a nylon filament is twist-implanted, thereby forming a wire rod portion having a length of 10 mm. The weight of the weight is such that the wire rod portion can be bent at 45 degrees when one end of the portion is supported and the weight is hung at the other end. Repeated bending fatigue test is the same method as above
Create an interdental brush, and insert the interdental brush 1 as shown in FIG.
The proximal end portion of the wire rod is fixed to the chuck 10 fixed to the reversing shaft 13, and the load 1 is applied to the tip end portion of the wire rod portion through the fine thread 11.
Hanging 00g of weight 12
Shows the result of measuring the number of times until the wire rod portion is broken by repeated bending when repeatedly inverted at a rate of 30 times / min.

[0020]

[Table 1]

As is clear from the results shown in Table 1, by using the Co alloy as the constituent material of the metal wire, the wire having higher bending strength (rigidity) and repeated bending fatigue strength than the case of using stainless steel. It was revealed that the rod portion can be obtained, and the interdental brush with improved usability and durability can be provided.

Next, Co-Cr- having the composition shown in Table 2 below.
Relationship between Co content and bending strength, and Co content and repeated bending fatigue strength in the case of forming an interdental brush by forming a wire rod portion having a twist structure equivalent to that described above using a Ni-based alloy metal wire And the relationship between the Co content and the ratio of non-defective products subjected to twisting were measured, and the results are shown in Table 2.

[0023]

[Table 2]

As is clear from the results shown in Table 2, Co
-By setting the Co content in the Cr-Ni-based alloy to be 30 to 60% by weight, it is possible to obtain a metal wire for an interdental brush that is excellent in bending strength, repeated bending fatigue strength, and twist workability. There was found.

Next, 45Co-21Cr-17Ni-15
Regarding a metal wire made of a Co alloy having a composition of Fe,
Table 3 shows the diameter, the minimum passage hole diameter, the bending strength, and the result of the usability evaluation test. Regarding the usability evaluation, when an interdental brush was actually used, the feeling of ease of insertion between the teeth and whether or not the metal wire was easily bent were evaluated. As the evaluation criteria, the results when the same operation was performed 20 times are shown, and the ○ marks show good results, the Δ marks show difficult to judge, and the X marks show bad.

[0026]

[Table 3]

As is clear from the results shown in Table 3, the diameter of the metal wire used for twisting is 0.20 mm.
If it is smaller, bending strength will be insufficient and it will bend easily when inserted between teeth, making it difficult to use and
If the diameter of the wire is larger than 0.35 mm, it will be difficult to insert it in the gap between the teeth, and the bending strength will be too high, and it will be difficult to insert it in the gap between the back teeth, etc. It is clear. From the above, it was found that the diameter of the metal wire is preferably in the range of 0.2 to 0.35 mm.

Next, FIG. 5 shows a C which is the SPRON 500.
FIG. 6 shows the result of measuring the elongation of a metal wire made of an o alloy and having a diameter of 0.25 mm, and FIG. 6 shows the result of measuring the elongation of a metal wire made of 18-8 stainless steel and having a diameter of 0.25 mm. As is clear by comparing the results of FIG. 5 and FIG. 6, it is clear that the metal wire of the Co alloy having the above composition exhibits better elongation than the metal wire made of 18-8 stainless steel, and is 30%. It has been found that it has sufficient elongation for a twist-implanted type interdental brush metal wire requiring the above elongation.

[0029]

INDUSTRIAL APPLICABILITY As described above, the present invention is an interdental brush having a structure in which a metal wire is folded in two, a plurality of filament bundles are sandwiched between them, and the filament bundle is twisted with the metal wires to form a brush. As a metal wire of
Since a metal wire made of a Co alloy is used, it is possible to provide an interdental brush that is superior in rigidity and has extended repeated bending fatigue life as compared with the conventional one using a metal wire made of stainless steel. Further, since the rigidity of the metal wire is improved, the rigidity of the wire rod part formed by the twisting workability of the metal wire is improved, and therefore the wire rod part may be bent when the brush is inserted into the gap between the teeth. It is possible to provide an interdental brush with reduced safety, which eliminates the risk of damaging the gingiva due to the bent wire rod portion, and which has improved safety. Further, since the Co alloy wire rod portion is superior to the conventional stainless steel in repeated bending fatigue strength, it is possible to provide an interdental brush in which the wire rod portion is not easily broken even by repeated use. Further, the Co alloy is excellent in familiarity with a living body and does not cause an allergic reaction or the like, and thus has a characteristic suitable for forming a wire rod portion of an interdental brush.

Further, when the Co content is 30 to 60% by weight, a high bending strength is sufficiently obtained, and the interdental tooth is excellent in repeated bending fatigue strength and excellent in workability during twisting. You can get a brush. Furthermore, if the diameter of the metal wire is in the range of 0.2 to 0.35 mm, it is a diameter that can be easily inserted into the gap between the teeth, has a moderately high bending strength, and has a wire rod that is difficult to bend It is possible to obtain an interdental brush that is durable and has a long product life.

[Brief description of drawings]

FIG. 1 is a side view showing an interdental brush according to an embodiment of the present invention.

2A and 2B are views for explaining a first half step of an example of a method for manufacturing an interdental brush, wherein FIG. 2A is a side view showing a state in which a bending tendency of a metal wire is corrected, and FIG. Two
FIG. 3 is a side view showing a folded state, and FIG. 6C is a side view showing a state in which a filament is sandwiched between metal wires.

FIG. 3 is a view for explaining the latter half step of an example of a method for manufacturing an interdental brush, (a) is a side view showing a state where a metal wire is twisted, and (b) is a filament cut. The side view which shows a state, (c) is a side view of an interdental brush completed product.

FIG. 4 is a perspective view showing a method for measuring repeated bending fatigue strength of an interdental brush of Test Example.

FIG. 5 shows the elongation of a test material, (a) showing the elongation of a stainless steel metal wire, and (b) showing the elongation of a Co alloy.

FIG. 6 is a side view showing an example of a conventional interdental brush.

[Explanation of symbols]

1 ... Interdental brush, 2 ... Wire rod part, 3 ...
・ Brush, 5 ... Metal wire, 6 ... Metal wire,
7 ... Roller, 7 '... Die, 8 ... Filament, 8' ... Brush, 4 ... Base,
9 ... Twisting machine, 10 ... Chuck, 12 ... Weight.

[Procedure amendment]

[Submission date] June 8, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Claims (1)

[Claims] 1. A filament in a wire rod portion formed by twisting a metal wire, which is formed by twisting a synthetic fiber or natural fiber filament positioned between two folded metal wires and twisting the metal wire. An interdental brush having a configuration in which a brush consisting of
An interdental brush, wherein the metal wire is formed of a Co alloy.