JP2022048800A - Interdental cleaner - Google Patents

Abstract

To provide an interdental cleaner where exfoliation of an elastomer and rupture of a shaft formed of thermoplastic resin are less likely to occur.SOLUTION: The interdental cleaner made of resin comprises a grip part, a neck part 20, and a cleaning part 30. The cleaning part 30 includes: a cleaning shaft part 40 made of thermoplastic resin; and a cleaning cover part 50 molded of an elastomer on the cleaning shaft part 40. The cleaning shaft part 40 has a conical part tapered toward a distal end, the conical part having a proximal end cone part 42 and a distal end cone part 43 forming respectively different inclination angles with the center line of the cleaning shaft part 40, and the inclination angle of the proximal end cone part 42 being larger than that of the distal end cone part 43.SELECTED DRAWING: Figure 2

Description

The present invention relates to a resin-made interdental cleaning tool for cleaning the gap between teeth.

An interdental cleaning tool is known as a tool for cleaning the gap between teeth.
This interdental cleaning tool includes a grip portion molded from a thermoplastic resin, a neck portion and a shaft portion at the tip thereof (hereinafter referred to as "hard shaft portion" in the description of background technology), and an outer surface of the hard shaft portion. There is a resin-made interdental cleaning tool having a cleaning portion formed by molding an elastomer (hereinafter, referred to as a "soft cleaning portion" in the description in the background technology).

In addition, some of the soft cleaning parts of the resin interdental cleaning tool gradually increase in diameter from the tip to the base end, and due to the configuration with different diameters, one interdental cleaning tool can be used for a plurality of teeth. It can correspond to the inter-size.

That is, if the space between teeth is narrow (for example, between the front teeth), the small diameter portion located at the tip of the soft cleaning part is used, and if the space between teeth is wide (for example, between the back teeth), the portion is located at the base end of the soft cleaning part. It is possible to efficiently clean the space between teeth by using each of the large diameter portions (Patent Document 1, Patent Document 2, Patent Document 3).

Japanese Unexamined Patent Publication No. 2017-319 Special Table 2017-506963 Japanese Unexamined Patent Publication No. 2013-192866

Normally, the size of the interdental part where the interdental cleaning tool is inserted varies from person to person, and even one individual does not have a constant size depending on the part. , It may be inserted into the interdental part beyond the base end of the soft cleaning part to the neck part side.

In the interdental cleaning tool of Patent Document 1, the soft cleaning portion is formed in a constant conical shape as a whole, and there is no insertion restriction. Therefore, when the soft cleaning part is inserted between the teeth, it is easy to insert the soft cleaning part between the teeth beyond the base end to the neck part, and when trying to pull out the soft cleaning part inserted between the teeth more than necessary, The base end of the soft cleaning part, which has a larger diameter than the neck part, is caught between the teeth, and the soft cleaning part is easily peeled off from the hard shaft part.

On the other hand, in the interdental cleaning tool of Patent Document 2, the hard shaft portion at the tip is configured to have a smaller diameter by the thickness of the elastomer so that the neck portion and the soft cleaning portion are substantially flush with each other. However, since a step is formed between the neck portion and the hard shaft portion, stress concentration occurs in this step when a bending load is applied to the soft cleaning portion during use, and the hard shaft portion is liable to break.

In the interdental cleaning tool of Patent Document 3, a large-diameter columnar portion is provided at the base end of the soft cleaning portion by an elastomer, and this is used as a stopper when the soft cleaning portion is inserted. However, since the large diameter part is formed of an elastomer, stress concentration occurs at the boundary between the large diameter part and the soft cleaning part when an excessive load is applied to the large diameter part in the insertion direction, and the large diameter part becomes Easy to tear from the soft cleaning part. In addition, when the soft cleaning part is inserted between the teeth beyond the large diameter part to the neck part side, the large diameter part becomes an obstacle at the time of pulling out and the soft cleaning part peels off from the hard shaft part or the large diameter part. The part may be torn and remain between the teeth. Furthermore, since the large diameter part is continuously and rapidly raised in the soft cleaning part, when the soft cleaning part is inserted between the teeth that are usually gradually narrowed, the soft cleaning part is between the teeth to the base end side. It may not reach and may not be sufficiently cleaned.

Therefore, in view of these circumstances, an object of the present invention is to prevent the elastomer from being inserted into the interdental portion beyond the base end of the soft cleaning portion to the neck portion side, and to be formed of an elastomer peeling or a thermoplastic resin. It is an object of the present invention to provide an interdental cleaning tool in which the breaking of the shaft is less likely to occur.

In order to solve the above problems, the invention of claim 1 is a resin interdental cleaning tool having a grip portion, a neck portion, and a cleaning portion, wherein the cleaning portion includes a cleaning shaft portion made of a thermoplastic resin. The cleaning shaft portion is composed of a cleaning covering portion formed by an elastoma on the cleaning shaft portion, and the cleaning shaft portion has a conical portion that becomes thinner toward the tip, and the conical portion is the center of the cleaning shaft portion. It has a proximal cone and a tip cone having different inclination angles with respect to the line, and the inclination angle of the proximal cone is larger than the inclination angle of the distal cone.

The invention of claim 2 is characterized in that the proximal end of the cleaning covering portion is located closer to the proximal end side than the proximal end of the proximal cone portion.
According to the third aspect of the present invention, the cleaning covering portion has a plurality of cleaning protrusions, and at least one of the plurality of cleaning protrusions has a proximal cone located in the length direction of the interdental cleaning tool. It is characterized by being located in a part.

The invention of claim 4 is characterized in that the base end cone is conical and the difference in diameter between the base end and the tip is 0.2 to 0.8 mm.
The invention according to claim 5 is characterized in that the inclination angle of the proximal cone portion is 10 ° to 20 °.

According to the invention of claim 6, the cleaning covering portion is, in order from the proximal end side, a rising portion, a proximal end covering portion, a central covering portion that becomes thinner toward the tip, and a central covering portion having a different inclination angle from the central covering portion and toward the tip. It is composed of a tip covering portion that becomes thinner, and the wall thickness of the base end of the base end covering portion is 0.1 to 0.5 mm, and the thickness of the tip covering portion relative to the wall thickness of the base end of the base end covering portion. The base end wall thickness ratio is characterized in the range of 0.75 to 1.5.

According to the present invention, while preventing the tooth from being inserted into the interdental portion beyond the base end of the soft cleaning portion to the neck portion side, the tooth is less likely to cause peeling of the elastomer or breakage of the shaft formed of the thermoplastic resin. Cleaning tools can be provided.

1 (a) is a plan view of the interdental cleaning tool, and FIG. 1 (b) is a side view of the same. FIG. 2A is a partial plan view including only the primary molded portion of the cleaning portion, and FIG. 2B is a partial plan view including the secondary molded portion of the cleaning portion. FIG. 3A is a cross-sectional view of a primary molded portion centered on a base conical portion, and FIG. 3B is a cross-sectional view including a secondary molded portion of the same portion.

Hereinafter, an embodiment of the interdental cleaning tool 1 that embodies the present invention will be described with reference to FIGS. 1 to 3. The vertical (direction) in FIGS. 1 (a) and 1 (b) is referred to as the length (direction) of the interdental cleaning tool 1 and each configuration, and the upper (direction) in the figure is the tip (direction). The lower middle (direction) is also called the base end (direction). Similarly, the left and right (direction) of FIG. 1 (a) are referred to as width (direction), and the left and right (direction) of FIG. 1 (b) are referred to as thickness (direction).

1 (a) shows a plan view of the interdental cleaning tool 1, and FIG. 1 (b) shows the same side view. The interdental cleaning tool 1 is composed of a grip portion 10, a neck portion 20, and a cleaning portion 30 in order from the base end side in the drawing.

Further, when the interdental cleaning tool 1 is distinguished from the molding material, the interdental cleaning tool 1 includes a primary molding portion molded with a thermoplastic resin and a secondary molding portion molded with an elastomer. The grip portion 10 and the neck portion 20 of the interdental cleaning tool 1 are composed of a primary molded portion, and the cleaning portion 30 includes a primary molded portion integrally molded together with the grip portion 10 and the neck portion 20. It is composed of a secondary molded portion molded above (see FIG. 3 (b)).

Here, the thermoplastic resin used for the primary molded portion is not particularly limited as long as it can be generally used in the field of the interdental cleaning tool 1. For example, there are olefin resin, polyamide resin, saturated polyester resin, polymethyl methacrylate, cellulose propionate, thermoplastic polyurethane, polycarbonate, polyacetal, ABS (acrylonitrile, butadiene, styrene) resin and the like. Examples of the olefin-based resin include propylene-based polymers (homomopolymers, random copolymers, block copolymers) and ethylene-based polymers (homomopolymers, random copolymers, block copolymers). Examples of the saturated polyester resin include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and polycyclohexylene methylene terephthalate. As the thermoplastic resin used for the primary part, one type can be used alone or two or more types can be used in combination.

Among these, olefin-based resins, saturated polyester-based resins, and polyamide-based resins are preferable from the viewpoint of molding processability and mechanical properties, and further, olefin-based resins are considered in consideration of breakage resistance and economic efficiency of the interdental cleaning tool 1. Resins, especially polypropylene, are more preferred. Further, as the thermoplastic resin used for the primary molded portion, a fiber material such as glass fiber, carbon fiber or aramid fiber can be adopted as an additive. Especially when polypropylene is used, glass fiber is more preferable as an additive.

The elastomer that can be used in the secondary molding portion is not particularly limited, and examples thereof include thermoplastic elastomers (TPE) such as styrene-based, olefin-based, vinyl chloride-based, and polyamide-based. Further, a thermosetting elastomer made of a thermosetting resin such as a silicone-based, urethane-based, or fluorine-based resin can also be used. Further, as the thermosetting elastomer, rubber such as synthetic rubber or natural rubber can also be used. Synthetic rubber includes styrene butadiene rubber, butadiene rubber, chloroprene rubber, isoprene rubber, petit rubber, ethylene propylene rubber, acrylonitrile butadiene rubber, silicone rubber, fluororubber, acrylic rubber, urethane rubber, polysulfide rubber, chlorinated butyl rubber, and shrimp chlor. There are hydrin rubber and so on. In particular, a thermoplastic elastomer is preferable because of ease of molding. Elastomers can be used alone or in combination of two or more.

Hereinafter, each configuration of the interdental cleaning tool 1 will be specifically described. The numerical values shown below are examples.
As shown in FIGS. 1 (a) and 1 (b), the grip portion 10 is formed in a flat plate shape having a width (8.0 mm) wider than the thickness (1.7 mm), and is viewed in a plan view (FIG. 1). (A)) forms a substantially rectangular shape. The thickness of the grip portion 10 is preferably 0.8 to 5.0 mm as a dimension that makes it easy to grip the gap between teeth by hand. Further, the width of the grip portion 10 is preferably 3.0 to 12.0 mm for the same reason.

The tip of the grip portion 10 is formed in a conical shape whose width becomes narrower toward the tip in a plan view, and is connected to the neck portion 20. Further, the grip portion 10 is composed of a primary molding portion, and is a portion where the user grips the interdental cleaning tool 1 with his / her fingers.

Further, the neck portion 20 has a columnar shape with a diameter of 1.7 mm and forms a straight rod shape. The diameter of the neck portion 20 is preferably 1.0 to 2.2 mm from the viewpoint of axial strength and ease of bending during use. The base end of the neck portion 20 is connected to the grip portion 10, and the tip end is connected to the cleaning portion 30. The neck portion 20 is composed of a primary molded portion, and is located between the grip portion 10 and the cleaning portion 30 so as to be appropriately separated from each other. It is a part that can be used for cleaning between teeth up to the end. Further, when changing the direction of the cleaning portion 30 with respect to the grip portion 10, the user presses the neck portion 20 with a finger while gripping the grip portion 10, so that the neck portion 20 and the grip portion 10 are changed. The extending direction of the cleaning unit 30 can be changed.

The cleaning portion 30 is a portion that is inserted between the teeth to clean the spaces between the teeth. As described above, the cleaning portion 30 is formed of a primary molding portion and a secondary molding portion.
The cleaning portion 30 includes a cleaning shaft portion 40 formed in the primary molding portion as shown in FIG. 2A and a secondary molding portion 40 formed on the cleaning shaft portion 40 as shown in FIG. 2B. It is composed of a cleaning covering portion 50 made of a molded portion.

The cleaning shaft portion 40 has a conical portion that becomes thinner from the base end to the tip end. In particular, the cleaning shaft portion 40 of the present embodiment has a configuration in which two cones having different inclination angles (angles of conical portions with respect to the center line 60, the same applies hereinafter) are continuous. As shown in FIG. 3A, the center line 60 is the length of the center of gravity of the cross section of the primary molded portion (grip portion 10, neck portion 20, cleaning shaft portion 40) constituting the interdental cleaning tool 1. It is a line connected in the vertical direction, and is a straight line in the present embodiment.

Specifically, as shown in FIG. 2A, the base end of the cleaning shaft portion 40 is a cylindrical portion 41 having a diameter of 1.7 mm, which continues from the neck portion 20 and has the same diameter as the neck portion 20. Further, a proximal cone 42 is formed at the tip thereof, which becomes thinner toward the tip, and the tip of the proximal cone 42 has a different inclination angle from the proximal cone 42, and the tip cone becomes thinner toward the tip. The portion 43 is formed. The proximal cone 42 constitutes the proximal cone, the distal cone 43 constitutes the distal cone, and the proximal cone 42 and the distal cone 43 form a cone. The leading edge of the tip conical portion 43 (the upper end of FIG. 2A) is formed in a spherical shape.

As shown in FIG. 3A, a cross-sectional view of the surface through which the center line 60 of the cleaning shaft portion 40 passes is shown, the inclination angle of the base end conical portion 42 is 15 °. Further, the same inclination angle of the tip conical portion 43 is 1 °. In FIGS. 3 (a) and 3 (b), the hatching showing the cross-sectional view is omitted. The inclination angle of the base end conical portion 42 is preferably 10 to 20 °, and the inclination angle of the tip end conical portion 43 is preferably 0.2 to 1.8 °, which is easy to insert between teeth.

That is, in the cleaning shaft portion 40, in order from the proximal end, a cylindrical portion 41 having the same diameter, a proximal conical portion 42 having a relatively large inclination angle, and a tip conical portion 43 having a relatively small inclination angle are continuously connected. It forms a formed composition.

The diameter α of the base end 42a of the base end conical portion 42 is 1.7 mm, which is the same diameter as the cylindrical portion 41, and the diameter β of the tip end 42b of the base end conical portion 42 is 1.0 mm. There is a difference of 0.7 mm in diameter between the base end 42a and the tip end 42b of 42. The diameter β of the tip 42b of the proximal conical portion 42 is preferably 0.2 to 1.8 mm in consideration that it also functions as an insertion restriction and can be used up to the proximal end 42a.

If the start or end positions of the proximal cone 42 and the distal cone 43 are different in the circumferential direction, the position on the proximal end side is referred to as the proximal end, and the position on the distal end side is referred to as the distal end. That is. This also applies to other cones.

On the other hand, the cleaning covering portion 50 is composed of a secondary molding portion and covers the outer surface of the cleaning shaft portion 40.
As shown in FIG. 2B, the cleaning covering portion 50 is composed of a secondary molding portion molded on a cleaning shaft portion 40 (not shown by the coating; see FIG. 2A) which is a primary molding portion. It is composed of a shaft covering portion 51 that covers the cleaning shaft portion 40, and a large number of cleaning protrusions 52 formed on the shaft covering portion 51.

As shown in FIG. 3B, the shaft covering portion 51 is a portion that covers the outer surface of the cleaning shaft portion 40, and the base end of the shaft covering portion 51 is suddenly thickened from the cleaning shaft portion 40 to a constant wall thickness. It is a rising portion 53.

The shaft covering portion 51 is inclined from the base end side to the rising portion 53, the base end covering portion 54 having a columnar shape, the central covering portion 55 that becomes thinner toward the tip, and the central covering portion 55. It is composed of a tip covering portion 56 having a different angle and becoming thinner toward the tip.

Explaining the relationship between each configuration of the cleaning covering portion 50 and each configuration of the cleaning shaft portion 40, the proximal end 53a of the rising portion 53 in the length direction is the proximal end 42a of the proximal conical portion 42 (the tip 41b of the cylindrical portion 41). ) Is located on the base end side.

Further, the tip 54b of the base end covering portion 54 (the base end 55a of the central covering portion 55) is on the tip side of the base end 42a of the base end conical portion 42, and the tip end 42b (tip conical portion) of the proximal end conical portion 42. It is located closer to the proximal end side than the proximal end 43a) of 43.

Further, the tip 55b of the central covering portion 55 (the base end 56a of the tip covering portion 56) is located on the tip side of the tip end 42b of the base end conical portion 42.
The inclination angle of the conical portion in the central covering portion 55 is 15 °. Further, the inclination angle of the tip covering portion 56 is 1.4 °. The leading edge (upper end of FIG. 2B) of the tip covering portion 56 is formed in a spherical shape. The inclination angle of the conical portion of the central covering portion 55 is preferably 10 to 20 °, and the inclination angle of the tip covering portion 56 is preferably 0.2 to 1.8 °.

On the other hand, as the wall thickness of the cleaning covering portion 50 shown in FIG. 3B, the wall thickness of the base end 54a (tip 53b of the rising portion 53) of the base end covering portion 54 is 0.25 mm, and the wall thickness of the base end covering portion 54 is The wall thickness of 54b (base end 55a of the central covering portion 55) is 0.33 mm. Further, the wall thickness of the tip 55b of the central covering portion 55 (base end 56a of the tip covering portion 56) is 0.20 mm, which is relative to the wall thickness of the base end 54a of the base end covering portion 54 (tip 53b of the rising portion 53). The wall thickness ratio of the tip 55b of the central covering portion 55 (the base end 56a of the tip covering portion 56) is 0.8.

The thickness of the base end 54a of the base end covering portion 54 (the tip end 53b of the rising portion 53), the wall thickness of the tip end 54b of the base end covering portion 54 (the base end 55a of the central covering portion 55), and the thickness of the central covering portion 55. The wall thickness of the tip 55b (base end 56a of the tip covering portion 56) is preferably 0.10 to 0.50 mm, respectively. Further, the ratio of the wall thickness of the tip 55b of the central covering portion 55 (base end 56a of the tip covering portion 56) to the wall thickness of the base end 54a of the base end covering portion 54 (the tip end 53b of the rising portion 53) is from 0.75. A range of 1.5 is preferred. When the wall thickness ratio is within this range, the base end 54a is not too thin and difficult to peel off, and is not too thick and is not easily caught.

These thickness and diameter dimensions are measured with a microscope by cutting the corresponding part of the interdental cleaning tool 1 (the cleaning covering portion 50 does not include the cleaning protrusion 52) in the direction orthogonal to the center line 60. ..

The tilt angle is measured from a direction perpendicular to the center line 60 using a microscope. In the measurement of the cleaning shaft portion 40 covered by the cleaning covering portion 50, the cleaning covering portion 50 is removed with a solvent or physically, and the corresponding portion is measured. If the cross section is not circular, the longest straight line passing through the center of gravity of the cross section is regarded as the diameter, and if the wall thickness is not uniform, the thickest part is taken as the measurement target.

Each of the cleaning protrusions 52 has a conical shape and is a protrusion that protrudes from the shaft covering portion 51 in a direction orthogonal to the center line 60. The cleaning protrusions 52 form a plurality of rows formed in the length direction at regular intervals on the cleaning covering portion 50, and a plurality of rows are formed in the circumferential direction with the rows slightly displaced in the length direction. ing.

Further, a part of the cleaning protrusion 52, in the case of FIG. 3B as an example, the cleaning protrusion 52 located on the most proximal side of each of the left and right sides is located at the portion where the proximal conical portion 42 is located in the length direction. ing.

According to the interdental cleaning tool 1 of the above embodiment, the following effects can be obtained.
(1) In the above embodiment, the cleaning shaft portion 40 has a base end conical portion 42 having a large inclination angle and a tip conical portion 43 having a looser inclination angle. Since the cleaning shaft portion 40 has a conical shape with a thin tip as a whole, it can be used as an interdental cleaning tool 1 in a place where the interdental space is narrow and a place where the interdental space is wide.

(2). Further, the cleaning shaft portion 40 has a proximal conical portion 42 having a relatively large inclination angle. Therefore, even when the interdental cleaning tool 1 is used in a place where the interdental space is wide, the proximal conical portion 42 becomes an insertion resistance, and it becomes easy to prevent further insertion of the interdental cleaning tool 1.

(3). The cleaning shaft portion 40 including the base end conical portion 42 is made of a thermoplastic resin. Therefore, even if it is inserted between teeth, it is difficult to be elastically deformed, and the base end conical portion 42 becomes an insertion resistance.
(4). The cleaning covering portion 50 made of an elastomer covers the proximal conical portion 42 and the distal end conical portion 43, and when the proximal conical portion 42 has an insertion resistance between the teeth, the space between the teeth is the cleaning covering portion 50. It has not reached the base end 53a of the rising portion 53, which is the base end. Therefore, when the interdental cleaning tool 1 is pulled out, it does not get caught in the cleaning covering portion 50 and is difficult to peel off.

(5). Further, since the proximal end 53a of the rising portion 53, which is the proximal end of the cleaning covering portion 50, is closer to the proximal end side than the proximal end 42a of the proximal conical portion 42, the cleaning covering portion 50 is pulled out when the interdental cleaning tool 1 is pulled out. Is more difficult to peel off.

(6). The cleaning shaft portion 40 has a cylindrical portion 41, a base end conical portion 42, and a tip conical portion 43, and there is no step between them. Therefore, even when bending stress is applied to the cleaning shaft portion 40, the cleaning shaft portion 40 is unlikely to break due to stress concentration.

(7). A part of the cleaning protrusions 52 is located at the portion where the proximal conical portion 42 is located in the length direction. Therefore, even when the proximal conical portion 42 is inserted between the teeth, cleaning by the cleaning protrusion 52 is possible.

The above embodiment may be changed as follows.
○ The neck portion 20 and the cleaning shaft portion 40 are formed in a circular cross section, but the cross section is not limited to a perfect circle, but may be an ellipse, an oval cross section (a shape in which semicircles are connected by a straight line), an egg shape, or the like. Further, a shape other than the circular cross-section, for example, a polygonal cross-section may be used. Further, a plurality of shapes may be combined, such as having a circular cross-section in a certain portion and a polygonal cross-section in another portion in the length direction. The cleaning shaft portion 40 may have a conical shape that becomes thinner toward the tip.

○ The neck portion 20 is cylindrical, but may have a shape such as a cone whose diameter changes.
○ The grip portion 10 and the neck portion 20 are composed of only the primary molded portion, but may be configured including the secondary molded portion. For example, a secondary molded portion is formed on the grip portion 10 for cushioning during gripping, and a secondary molded portion as a bridge connecting the grip portion 10 and the cleaning portion 30 at the time of molding is formed on the neck portion. It may have been done.

○ The grip portion 10, the neck portion 20, and the cleaning portion 30 are not limited to straight lines, but may be curved in an arc shape.

1 ... Intertooth cleaning tool 10 ... Grip part 20 ... Neck part 30 ... Cleaning part 40 ... Cleaning shaft part 42 ... Base end conical part (base end cone part, cone shape part) )
43 ... Tip cone (tip cone, cone)
50 ... Cleaning covering part 51 ... Shaft covering part 52 ... Cleaning protrusion 54 ... Base end covering part 55 ... Central covering part 56 ... Tip covering part

Claims (6)

A resin-made interdental cleaning tool having a grip portion, a neck portion, and a cleaning portion.
The cleaning portion includes a cleaning shaft portion made of a thermoplastic resin and a cleaning coating portion molded by an elastomer on the cleaning shaft portion.
The cleaning shaft portion has a conical portion that becomes thinner toward the tip, and has a conical portion.
The cone-shaped portion has a proximal cone portion and a tip cone portion having different inclination angles with respect to the center line of the cleaning shaft portion.
An interdental cleaning tool characterized in that the inclination angle of the base end cone portion is larger than the inclination angle of the tip end cone portion. The interdental cleaning tool according to claim 1, wherein the proximal end of the cleaning covering portion is located closer to the proximal end side than the proximal end of the proximal cone portion. The cleaning covering portion has a plurality of cleaning protrusions and has a plurality of cleaning protrusions.
The tooth according to claim 1 or 2, wherein at least one of the plurality of cleaning protrusions is located at a portion where the proximal cone is located in the length direction of the interdental cleaning tool. Cleaning tool. The tooth according to any one of claims 1 to 3, wherein the base end cone is conical and the difference in diameter between the base end and the tip is 0.2 to 0.8 mm. Cleaning tool. The interdental cleaning tool according to any one of claims 1 to 4, wherein the inclination angle of the base end cone is 10 ° to 20 °. The cleaning covering portion is composed of a rising portion, a proximal end covering portion, a central covering portion that becomes thinner toward the tip, and a tip covering portion that has a different inclination angle from the central covering portion and becomes thinner toward the tip, in order from the proximal end side. The wall thickness of the base end of the base end covering portion is 0.1 to 0.5 mm, and the ratio of the wall thickness of the base end of the tip covering portion to the wall thickness of the base end of the base end covering portion. The interdental cleaning tool according to any one of claims 1 to 5, wherein is in the range of 0.75 to 1.5.

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