Interdental cleaning tool

Abstract

To provide an interdental cleaning tool in which a wire is easily inserted to an interdental part when the wire is inserted to the interdental part.SOLUTION: An interdental cleaning tool 1 includes a head part 3 and a handle part 2. The head part 3 includes: a connection part 32 connected to the handle part 2 and extending along a first direction; a first support part 311 extending in a second direction from an end portion of the handle part 2 side of the connection part 32; a second support part 312 extending in the second direction from an end portion opposite to the handle part 2 of the connection part 32; and a wire 4 stretched across the first support part 311 and the second support part 312. When a force by which the first support part 311 is displaced by 1 mm when the force is applied along a direction D1 is A [N], and a force by which the second support part 312 is displaced by 1 mm when the force is applied along a direction D2 is B [N], A / B is equal to or less than 1.15.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to an interdental cleaner.

Background Art

[0002] Patent Document 1 describes a conventional interdental cleaner. The interdental cleaner described in Patent Document 1 includes a pair of support pieces arranged at intervals, a handle portion that can be held by hand, and a wire member extending between the pair of support pieces.

[0003] When using the interdental cleaner, the user can clean between the teeth by holding the handle and moving the interdental cleaner horizontally with the wire member inserted between the teeth.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in an interdental cleaner, if the difference in the difficulty of bending between a pair of support pieces is too large, when inserting the wire member between the teeth, if the interdental cleaner is inserted while moving it horizontally along the lateral direction, either the pushing case or the pulling case may bend significantly. In this case, there is a problem that it is difficult to insert the wire member between the teeth when inserting the wire member between the teeth.

[0006] In view of the above circumstances, the present disclosure is made, and an object thereof is to provide an interdental cleaner that makes it easy to insert a wire member between the teeth when inserting the wire member between the teeth.

Means for Solving the Problems

[0007] In order to solve the above problems, the interdental cleaner of the present disclosure includes, as the subject, the interdental cleaner described in Item 1 below.

[0008] Item 1. A head portion, and a handle portion protruding from the head portion along a first direction. The head portion has a connecting portion connected to the handle portion and extending along the first direction, a first support portion extending in a second direction intersecting the first direction from an end portion of the connecting portion on the handle portion side in the first direction, a second support portion extending in the second direction from an end portion of the connecting portion opposite to the handle portion in the first direction, and a wire member bridged between the first support portion and the second support portion. When a force is applied to the first support portion along the direction from the first support portion toward the second support portion in the first direction and it is displaced by 1 mm, the force at this time is defined as A [N], and when a force is applied to the second support portion along the direction from the second support portion toward the first support portion in the first direction and it is displaced by 1 mm, the force at this time is defined as B [N]. The interdental cleaner is such that A / B is 1.15 or less.

[0009] Further, the interdental cleaner of the present disclosure includes, as a preferred embodiment of the interdental cleaner described in Item 1 above, the interdental cleaner described in Item 2 below.

[0010] Item 2. The interdental cleaner according to Item 1, wherein the head portion is formed such that A + B is 6.75 [N] or less.

[0011] Further, the interdental cleaner of the present disclosure includes, as a preferred embodiment of the interdental cleaner described in Item 1 or Item 2 above, the interdental cleaner described in Item 3 below.

[0012] Item 3. The interdental cleaner according to Item 1 or Item 2, wherein the radius of curvature of the inner corner portion between the connecting portion and the first support portion is smaller than the radius of curvature of the inner corner portion between the connecting portion and the second support portion.

Advantages of the Invention

[0013] The interdental cleaner according to the above aspect of the present disclosure has the advantage that when inserting the wire into the interdental space, it is easy to insert the wire into the interdental space.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0015] <Embodiment> Hereinafter, an embodiment of the interdental cleaner 1 according to the present disclosure will be described with reference to the drawings.

[0016] As shown in FIG. 1, the interdental cleaner 1 includes a head portion 3 and a handle portion 2 protruding from the head portion 3 along a first direction. The head portion 3 is connected to the handle portion 2 and has a connecting portion 32 extending along the first direction, a first support portion 311, a second support portion 312, and a wire 4 bridged between the first support portion 311 and the second support portion 312. The first support portion 311 extends in a second direction intersecting the first direction from an end portion of the connecting portion 32 on the handle portion 2 side in the first direction. The second support portion 312 extends in the second direction from an end portion of the connecting portion on the side opposite to the handle portion 2 in the first direction.

[0017] Here, when a force is applied to the first support portion 311 along the direction D1 from the first support portion 311 toward the second support portion 312 among the first directions, let the force when the first support portion 311 is displaced by 1 mm be A [N]. Further, when a force is applied to the second support portion 312 along the direction D2 from the second support portion 312 toward the first support portion 311 among the first directions, let the force when the second support portion 312 is displaced by 1 mm be B [N]. The head portion 3 is set such that A / B is 1.15 or less.

[0018] With such a configuration, when inserting the wire 4 between the teeth, even if the interdental cleaning tool 1 is moved along the lateral direction, it is possible to reduce a situation where either the pushing case or the pulling case bends greatly, and it is easy to balance the pushing and pulling. As a result, when inserting the wire 4 between the teeth, the interdental cleaning tool 1 that can easily insert the wire 4 between the teeth can be obtained.

[0019] In the following description, for convenience of explanation, as shown in FIG. 1, the direction in which the first support portion 311 and the second support portion 312 are separated is defined as the "lateral direction", and the longitudinal direction of the first support portion 311 and the second support portion 312 is defined as the "longitudinal direction". Among the longitudinal directions, as shown in FIG. 1, "up" and "down" are defined. The longitudinal direction is orthogonal to the lateral direction. Further, the direction orthogonal to the lateral direction and the longitudinal direction is defined as the "thickness direction". There are cases where the lateral direction is referred to as the "first direction", the longitudinal direction is referred to as the "second direction", and the thickness direction is referred to as the "third direction". However, these definitions of directions are only for the purpose of explanation and are not intended to specify the usage mode of the interdental cleaning tool 1.

[0020] In addition, in this specification, "parallel" includes not only cases where two straight lines, planes, etc. (hereinafter, straight lines, etc.) do not intersect even when extended, but also cases where the angle formed by two straight lines, etc. intersects within a range of 10° or less. Further, "orthogonal" means a case where two straight lines, etc. intersect within a range of 90° ± 10°. However, even if two straight lines, etc. do not directly intersect, if they intersect when extended, they are included in "orthogonal".

[0021] (Handle portion 2) The handle part 2 is the part that the user grips with their fingers. The handle part 2 preferably protrudes along the lateral direction from the upper end part of the head part 3. As shown in FIG. 1, in the lateral direction, the handle part 2 according to the present embodiment has a first part 21, a second part 22, and a third part 23 arranged in order from the end part on the head part 3 side, and these are integrally formed. Note that the handle part 2 may protrude along the vertical direction from the upper end part of the head part 3.

[0022] The first part 21 extends straight and parallel in the lateral direction. The width (length in the vertical direction) of the first part 21 is preferably 3 mm or more and 7 mm or less, more preferably 3.5 mm or more and 6.5 mm or less, and still more preferably 4 mm or more and 6 mm or less.

[0023] The second part 22 is inclined with respect to the lateral direction so as to go upward as it goes toward the protruding tip end side of the handle part 2 in the lateral direction. The width of the second part 22 is formed to be equal to or less than the width of the first part 21. The third part 23 is inclined with respect to the lateral direction so as to go downward as it goes toward the protruding tip end side of the handle part 2 in the lateral direction. The third part 23 is formed in a pointed shape as it approaches the tip. The width of the third part 23 is formed to be equal to or less than the width of the second part 22. The upper edge of the handle part 2 is smoothly continuous from the first part 21 to the third part 23. Also, the lower edge of the handle part 2 is smoothly continuous from the first part 21 to the third part 23. Note that the shape of the handle part 2 is not particularly limited, and it may be formed straight and with the same width over the entire length.

[0024] The handle part 2 preferably has the same thickness over the entire length. In the present embodiment, the handle part 2 has a flat shape with a thickness shorter than the width. The thickness of the handle part 2 is preferably, for example, 1.5 mm or more and 3.0 mm or less, more preferably 1.6 mm or more and 2.1 mm or less. Note that the handle part 2 does not have to be in a flat shape, and it may be, for example, in a rod shape.

[0025] The material of the handle portion 2 is not particularly limited, and examples thereof include resins having flexibility, such as polypropylene, polystyrene, polyethylene, and polyethylene terephthalate.

[0026] (Head portion 3) The head portion 3 is a portion where the wire 4 is hung. The head portion 3 includes a pair of support portions 31, a connecting portion 32 connecting the pair of support portions 31, and a wire 4 hung on the pair of support portions 31. The pair of support portions 31 and the connecting portion 32 are integrally formed. Further, the pair of support portions 31 and the connecting portion 32 are preferably formed of the same material as the handle portion 2. The handle portion 2, the pair of support portions 31, and the connecting portion 32 are preferably integrally formed. However, the pair of support portions 31 and the connecting portion 32 may be separate from the handle portion 2 and may not be formed of the same material.

[0027] The pair of support portions 31 has a first support portion 311 and a second support portion 312 that are separated in the lateral direction. The first support portion 311 is provided at an end portion of the connecting portion 32 on the handle portion 2 side in the lateral direction. As shown in FIG. 2, the first support portion 311 extends in the vertical direction and protrudes downward from the connecting portion 32 and the handle portion 2 in the vertical direction. The width H1 (lateral length) of the first support portion 311 is preferably 2 mm or more and 4 mm or less, more preferably 2.5 mm or more and 3 mm or less.

[0028] The corner portion where the first support portion 311 and the connecting portion 32 meet (hereinafter sometimes referred to as the first corner portion 33) is a curve when viewed in the thickness direction (sometimes referred to as "front view"). Further, the corner portion where the first support portion 311 and the handle portion 2 meet (hereinafter sometimes referred to as the third corner portion) is a curve in the front view. Further, the front end surface of the first support portion 311 is in a semi-circular arc shape in the front view.

[0029] The radius of curvature of the first corner portion 33 is preferably 1 mm or more and 5 mm or less, more preferably 2 mm or more and 4 mm or less, and still more preferably 2.5 mm or more and 3.5 mm or less. Also, the radius of curvature of the third corner portion is preferably larger than the radius of curvature of the first corner portion 33. The radius of curvature of the third corner portion is preferably 4 mm or more and 8 mm or less, more preferably 5 mm or more and 7 mm or less, and still more preferably 5.5 mm or more and 6.5 mm or less.

[0030] The second support portion 312 is located on the tip side of the interdental cleaning tool 1 rather than the first support portion 311 in the lateral direction. The second support portion 312 is provided at the end portion on the side opposite to the handle portion 2 of the connecting portion 32 in the first direction. The upper end portion of the second support portion 312 is formed in an arc shape of 1 / 8 circle and is connected to the connecting portion 32. The lower end portion of the second support portion 312 extends in the vertical direction. The width H2 (the length in the lateral direction) of the second support portion 312 is preferably 2 mm or more and 4 mm or less, more preferably 2.5 mm or more and 3 mm or less. The width H2 of the second support portion 312 is preferably the same as the width H1 of the first support portion 311.

[0031] The corner portion between the second support portion 312 and the connecting portion 32 (hereinafter, may be referred to as the second corner portion 34) is a curve in a front view. The radius of curvature of the second corner portion 34 is preferably 6 mm or more and 10 mm or less, more preferably 7 mm or more and 9 mm or less, and still more preferably 7.5 mm or more and 8.5 mm or less. Also, the front end surface of the second support portion 312 is in a semi-arc shape in a front view, similar to the first support portion 311. Note that the boundary between the second support portion 312 and the connecting portion 32 is a virtual surface connecting the center of the inner peripheral curve and the center of the outer peripheral curve in the second corner portion 34, and actually, the boundary may not appear.

[0032] The radius of curvature of the first corner portion 33 is preferably smaller than the radius of curvature of the second corner portion 34. For example, the radius of curvature of the first corner portion 33 is preferably half or less of the radius of curvature of the second corner portion 34. Thereby, in a state where the wire 4 is inserted between the teeth, the first corner portion 33 is less likely to interfere with the teeth, and it is easy to move the interdental cleaning tool 1 in the lateral direction.

[0033] Since the radius of curvature of the first corner portion 33 and the radius of curvature of the second corner portion 34 of the head portion 3 are different, the head portion according to the present embodiment is asymmetric with respect to the vertical center line passing through the center point P1. Further, it is preferable that the head portion 3 has the same width from the position on the second support portion 312 side rather than the first corner portion 33 in the connecting portion 32 to the second support portion 312. The "same width" as used herein means that the width H3 of the connecting portion 32 is 95% or more and 105% or less of the width H2 of the second support portion 312. As a result, the second support portion 312 is more likely to bend than the first support portion 311 and does not bend too much, so that it is easy to insert between teeth and it is easy to move the wire 4 along between teeth during interdental cleaning.

[0034] Here, as shown in FIG. 2, let the length of the wire 4 between the first support portion 311 and the second support portion 312 be L1, and let the distance between the outer surfaces of the first support portion 311 and the second support portion 312 in the horizontal direction be L2. In this case, L1 / L2 is set to be 0.75 or more. With such a configuration, the interdental cleaning tool 1 can reduce the situation where the distance L2 between the outer surfaces of the support portion 31 of the head portion 3 becomes too large and can increase the length L1 of the wire 4. Therefore, for example, it is easy to move in the horizontal direction during interdental cleaning of the back teeth.

[0035] The distance L2 between the outer surfaces of the first support portion 311 and the second support portion 312 in the horizontal direction is preferably 20 mm or more and 30 mm or less, more preferably 20.5 mm or more and 26 mm or less, and still more preferably 21 mm or more and 22 mm or less. As a result, the horizontal length of the head portion 3 does not become too small and does not become too large. Thereby, even if the horizontal length of the head portion 3 is designed to be compact to such an extent that it does not become too small, the length of the wire 4 can be increased. Therefore, for example, it is easy to move the interdental cleaning tool 1 during interdental cleaning of the back teeth.

[0036] The connecting portion 32 connects the first support portion 311 and the second support portion 312, and the handle portion 2 is connected thereto. The connecting portion 32 extends along the lateral direction. In the connecting portion 32, the portion from the first support portion 311 to the center (point P1) is parallel to the lateral direction and is formed straight. In the connecting portion 32, the portion from the center (point P1) of the connecting portion 32 to the second support portion 312 side is formed in a 1 / 8 arc shape and is continuous with the second support portion 312.

[0037] The wire 4 extends in the lateral direction. The wire 4 is bridged between the first support portion 311 and the second support portion 312. One end portion of the wire 4 penetrates the first support portion 311. At one end portion of the wire 4, the portion protruding from the first support portion 311 is heat-welded and fixed to the first support portion 311. Also, the other end portion of the wire 4 penetrates the second support portion 312. At the other end portion of the wire 4, the portion protruding from the second support portion 312 is heat-welded and fixed to the second support portion 312.

[0038] The wire 4 is preferably composed of a plurality of multifilaments. Each multifilament is formed by twisting a plurality of monofilaments. Examples of the material of each monofilament include thermoplastic synthetic resins such as polyethylene, nylon, Teflon (registered trademark), vinylon, polyethylene terephthalate, polybutylene terephthalate, polyacrylonitrile, polystyrene, and polypropylene.

[0039] The maximum distance L3 between the wire 4 and the connecting portion 32 is preferably 8 mm or more and 13 mm or less, more preferably 9 mm or more and 12 mm or less, and still more preferably 10 mm or more and 11 mm or less. Thereby, when inserting between teeth, even if the user does not open the mouth wide, the wire 4 can be inserted between the teeth, and when the wire 4 is inserted between the teeth, the connecting portion 32 can be made less likely to hit the teeth.

[0040] As described above, when a force is applied to the first support portion 311 in the direction D1, the force when the first support portion 311 is displaced by 1 mm is defined as A [N], and when a force is applied to the second support portion 312 in the direction D2, the force when the second support portion 312 is displaced by 1 mm is defined as B [N]. The measurement method is not particularly limited. For example, when applying a force to the first support portion 311 in the direction D1, with the portion on the side of the second support portion 312 from point P1 being gripped by a gripping device such as a vise, a force is applied to the first support portion 311 along the direction D1. Also, when applying a force to the second support portion 312 in the direction D2, with the portion on the side of the first support portion 311 from point P1 being gripped by the gripping device, a force is applied to the second support portion 312 along the direction D2. Note that point P1 refers to the midpoint of the distance L1 between the first support portion 311 and the second support portion 312 in the lateral direction.

[0041] The head portion 3 is set such that A / B is 1.15 or less. A / B is preferably 1.1 or less, more preferably 1.05, and even more preferably 1.0. On the other hand, the lower limit value of A / B is preferably 0.85 or more, more preferably 0.9 or more, and even more preferably 0.95 or more. With such a configuration, when inserting the wire 4 between the teeth, even if the interdental cleaning tool 1 is moved along the lateral direction, it is possible to reduce the situation where only one of the pushing case and the pulling case bends, and it is easy to balance the pushing and pulling. As a result, when inserting the wire 4 between the teeth, the interdental cleaning tool 1 that can easily insert the wire 4 between the teeth can be obtained.

[0042] Also, the head portion 3 preferably has A + B of 6.75 [N] or less, more preferably 5 [N] or less, and even more preferably 4 [N] or less. The lower limit value of A + B is preferably 1 [N] or more. With such a configuration, since the first support portion 311 and the second support portion 312 are relatively easy to bend, when the interdental cleaning tool 1 is moved in the lateral direction with the wire 4 inserted between the teeth, it is easy to bend the wire 4. Thereby, it is easy to deform the wire 4 according to the shape between the teeth, and the cleaning force between the teeth can be increased.

[0043] (Function and Effect) As described above, the interdental cleaner 1 according to the present embodiment is set such that A / B is 1.15 or less. Therefore, when inserting the wire 4 between teeth, even if the interdental cleaner 1 is moved along the lateral direction, it is possible to reduce the situation where only one of the pushing case and the pulling case bends, and it is easy to balance the pushing and pulling. As a result, when inserting the wire 4 between teeth, the interdental cleaner 1 can be made such that the wire 4 can be easily inserted between teeth.

[0044] Further, in the interdental cleaner 1 according to the present embodiment, the head portion 3 is formed such that A + B is 6.75 [N] or less. For this reason, the first support portion 311 and the second support portion 312 are relatively easy to bend, and when the interdental cleaner 1 is moved in the lateral direction with the wire 4 inserted between teeth, the wire 4 is easily bent. Accordingly, it is easy to deform the wire 4 according to the shape between teeth, and the cleaning power between teeth can be increased.

[0045] Further, in the interdental cleaner 1 according to the present embodiment, since the radius of curvature of the first corner portion 33 is smaller than the radius of curvature of the second corner portion 34, in a state where the wire 4 is inserted between teeth, the first corner portion 33 is less likely to interfere with the teeth, and it is easy to move the interdental cleaner 1 in the lateral direction.

[0046] <Modification Example> The above embodiment is merely one of various embodiments of the present disclosure. The embodiment can be variously modified according to design and the like as long as the object of the present disclosure can be achieved. Hereinafter, modification examples of the embodiment will be listed. The modification examples described below can be applied in appropriate combinations.

[0047] In the above embodiment, as an example where the handle portion 2 "protrudes along the lateral direction" from the head portion 3, an example where the handle portion 2 extends parallel to the lateral direction is given. However, for example, even in the case of FIG. 3, it is considered to be within the category of "the handle portion 2 protruding along the lateral direction". That is, in the present disclosure, the handle portion 2 protruding from the head portion 3 along the lateral direction means that the angle formed by the longitudinal direction of the handle portion 2 with respect to the lateral direction is within the range of ±45°.

[0048] In the above embodiment, the wire 4 was composed of a plurality of multifilaments, but it may be composed of only a plurality of monofilaments.

[0049] In the above embodiment, the longitudinal directions of the first support portion and the second support portion are orthogonal to the first direction. However, the first support portion and the second support portion do not necessarily have to be orthogonal to the first direction. The first support portion and the second support portion may be inclined at less than 90°, for example, with respect to the first direction. Further, the first support portion and the second support portion do not have to have a straight shape.

[0050] <Example> Hereinafter, examples of the present disclosure will be described. However, the present disclosure is not limited to the examples.

[0051] As Example 1, an interdental cleaner having the same form as the interdental cleaner 1 of the above embodiment was used. The distance L2 between the outer surfaces of the first support portion and the second support portion was set to 21 mm.

[0052] As Example 2, an interdental cleaner having the same form as the interdental cleaner 1 of the above embodiment was used. The distance L2 between the outer surfaces of the first support portion and the second support portion was set to 20 mm.

[0053] As Comparative Example 1, an interdental cleaner having the form shown in FIG. 4(B) was used. The distance L21 between the outer surfaces of the first support portion and the second support portion was set to 26 mm.

[0054] As Comparative Example 2, an interdental cleaner having the form shown in FIG. 4(C) was used. The distance L22 between the outer surfaces of the first support portion and the second support portion was set to 25.2 mm.

[0055] As Comparative Example 3, an interdental cleaner having the form shown in FIG. 4(D) was used. The distance L23 between the outer surfaces of the first support portion and the second support portion was set to 22 mm.

[0056] As Comparative Example 4, an interdental cleaner having the form shown in FIG. 4(E) was used. The distance L24 between the outer surfaces of the first support portion and the second support portion was set to 22.5 mm.

[0057] As Comparative Example 5, an interdental cleaner having the form shown in FIG. 4(F) was used. The distance L25 between the outer surfaces of the first support portion and the second support portion was set to 25 mm.

[0058] Using the interdental cleaners of Examples 1 and 2 and Comparative Examples 1 to 5, when a force was applied along direction D1 to the first support portion, the force when the first support portion was displaced by 1 mm was measured. Similarly, using the interdental cleaners of Examples 1 and 2 and Comparative Examples 1 to 5, when a force was applied along direction D2 to the second support portion, the force when the second support portion was displaced by 1 mm was measured.

[0059] Specifically, when applying a force in direction D1 to the first support portion, with the portion on the second support portion side from the midpoint of the distance between the first support portion and the second support portion held by a vise, a force was applied to the first support portion along direction D1 using an autograph. At this time, the test force (reaction force) applied when the first support portion was displaced by 1 mm was measured. An autograph, the desktop type precision universal testing machine AGS-J manufactured by Shimadzu Seisakusho, was used. When applying a force in direction D1 to the second support portion, with the portion on the first support portion side from the midpoint of the distance between the first support portion and the second support portion held by a vise, a force was applied to the second support portion along direction D2 using an autograph. At this time, the test force (reaction force) applied when the second support portion was displaced by 1 mm was measured.

[0060] The insertability and the ease of conforming to the teeth during interdental cleaning were evaluated.

[0061] (Evaluation method for insertability and ease of conforming to the teeth) Thirteen monitors performed interdental cleaning using the interdental cleaners of Examples 1 and 2 and Comparative Examples 1 to 5, and evaluated the ease of insertion between the teeth and the ease of conforming to the teeth during interdental cleaning based on the following evaluation criteria. As the evaluation criteria, each monitor evaluated as "5" for satisfaction, "4" for somewhat satisfied, "3" for neither, "2" for somewhat dissatisfied, and "1" for dissatisfied.

[0062] After that, the evaluation values of all monitors were aggregated and judged based on the following criteria. When the total value of the satisfied and slightly satisfied cases is 80% or more of the total, it is "◎"; when the total value of the satisfied and slightly satisfied cases is 70% or more but less than 80%, it is "〇"; when the total value of the satisfied and slightly satisfied cases is less than 70%, it is "△".

[0063] The test results are shown in Table 1.

[0064]

Table 1

[0065] In Example 1, the force A was 2.00 [N], the force B was 2.00 [N], and A / B was 1.00. At this time, the insertability was "◎". Also, in Example 2, the force A was 3.75 [N], the force B was 3.00 [N], and A / B was 1.25. At this time, the insertability was "◎". On the other hand, in Comparative Examples 1-5, A / B was 1.28, 1.33, 1.40, 1.35, 1.96, all of which were greater than 1.25. At this time, the insertability was "〇" or less. From this, it was found that when A / B is 1.25 or less, good insertability can be obtained.

[0066] In Example 1, A + B was 4.00 [N], and the evaluation of the ease of following the teeth during interdental cleaning was "◎". In Example 2, A + B was 6.75 [N], and the evaluation of the ease of following the teeth during interdental cleaning was "〇". On the other hand, in Comparative Examples 1-5, A + B exceeded 15 [N], and the evaluation of the ease of following the teeth during interdental cleaning was "△". From this, it was found that when A + B is 6.75 [N] or less, the ease of following the teeth during interdental cleaning is improved. Also, it was found that when A + B is 4 [N] or less, the ease of following the teeth during interdental cleaning is even better.

Explanation of symbols

[0067] 1 Interdental cleaning tool 2 Handle part 21 First part 22 Second part 23 Third part 3 Head part 31 Support part 311 First support part 312 Second support part 32 Connecting part 33 First corner part 34 Second corner part 4 Wire

Claims

1. a head portion, a handle portion protruding from the head portion along a first direction, and comprising: the head portion includes a connecting portion connected to the handle portion and extending along the first direction, a first support portion extending in a second direction intersecting the first direction from an end portion of the connecting portion on the handle portion side in the first direction, a second support portion extending in the second direction from an end portion of the connecting portion opposite to the handle portion in the first direction, a wire rod spanned between the first support portion and the second support portion, and having when a force is applied to the first support portion along a direction from the first support portion toward the second support portion in the first direction and the first support portion is displaced by 1 mm, the force at this time is defined as A [N], and when a force is applied to the second support portion along a direction from the second support portion toward the first support portion in the first direction and the second support portion is displaced by 1 mm, the force at this time is defined as B [N], then A / B is 1.15 or less, an interdental cleaner.

2. the head portion is formed such that A + B is 6.75 [N] or less, the interdental cleaner according to Claim 1.

3. the radius of curvature of the corner portion where the connecting portion and the first support portion meet is smaller than the radius of curvature of the corner portion where the connecting portion and the second support portion meet, the interdental cleaner according to Claim 1 or Claim 2.

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