JP7066323B2 - Intertooth cleaning tool - Google Patents

Description

The present invention relates to an interdental cleaning tool.

Conventionally, an interdental cleaning tool for cleaning the interdental space has been known. For example, Patent Document 1 discloses an interdental cleaning tool including a base portion having a shape extending in a specific direction and a cleaning portion made of an elastomer. The base portion has a shaft portion having a shape that can be inserted between teeth and extending linearly, and a grip portion having a shape that can be gripped by a finger. The cross section of the shaft portion (cross section in a plane orthogonal to the axial direction of the shaft portion) is circular. The grip portion is connected to the shaft portion and is formed flat. The cleaning portion is a portion for cleaning the space between teeth, and has a shape that covers a part of the outer peripheral surface of the shaft portion.

International Publication No. 2013/176297

When cleaning the space between the back teeth (molars) with an interdental cleaning tool as described in Patent Document 1, the shaft portion may be broken or the gingiva may be greatly stimulated. Specifically, cleaning between the teeth of the molars is more difficult than cleaning between the teeth of the anterior teeth, so when operating the grip portion so that the cleaning portion moves along the gap between the teeth of the molars. Overload is likely to act on the shaft, which may cause the shaft to break or the gums to be more irritated.

An object of the present invention is to provide an interdental cleaning tool capable of suppressing breakage of a shaft portion during cleaning between teeth and reducing irritation to the gums.

As a result of diligent studies to solve the above-mentioned problems, the present inventors have found that the longitudinal direction in the cross section of the grip portion (cross section in a plane orthogonal to the axial direction of the shaft portion) is particularly when cleaning between the teeth of the molar teeth. The cleaning part is often cleaned between the teeth in a posture that is approximately parallel to the vertical direction, and the cleaning part is pressed relatively strongly against the side surface of the molar tooth in order to effectively clean the side surface. It was found that the grip tends to be manipulated. Therefore, the present inventors have described the flexural rigidity of the shaft portion when an external force in the direction in which the teeth are lined up acts on the shaft portion and the axis when the external force in the direction orthogonal to the direction in which the teeth are lined up acts on the shaft portion. By making the bending rigidity of the part different from each other, the side surface of the molar tooth is effectively cleaned in a posture in which the longitudinal direction in the cross section of the grip part (cross section in a plane orthogonal to the axial direction of the shaft part) is parallel to the vertical direction. I came up with the idea that it is possible to achieve both doing and reducing irritation to the gums.

The present invention has been made from such a viewpoint. Specifically, the present invention has a shaft portion that extends in a specific direction and has a shape that can be inserted between teeth, and extends from the base end portion along the specific direction so as to be separated from the shaft portion. The shaft is provided with a grip portion having a shape that can be gripped by a finger, a base portion having the grip portion, and a cleaning portion that covers at least a part of the shaft portion and can clean the space between teeth. The portion has an insertion end portion on the opposite side of the base end portion in the specific direction, and the specific direction and the said portion are larger than the dimensions of the grip portion in the first direction which is a direction orthogonal to the specific direction. The size of the grip portion in the second direction, which is a direction orthogonal to both of the first directions, is larger, and the shaft portion is in a direction parallel to the second direction over the entire length of the shaft portion . Provided is an interdental cleaning tool formed so that the dimension of the shaft portion in a direction parallel to the first direction is larger than the dimension of the shaft portion.

In this inter-tooth cleaning tool, the axis in the direction parallel to the first direction (direction orthogonal to the longitudinal direction of the grip) rather than the dimension of the shaft in the direction parallel to the second direction (longitudinal direction of the grip). Since the size of the portion is larger (because the longitudinal direction of the shaft portion in the cross section orthogonal to the axial direction of the shaft portion is orthogonal to the longitudinal direction of the grip portion in the same cross section), the longitudinal length of the grip portion with respect to the shaft portion. Bending rigidity of the shaft when an external force acts in a direction parallel to the longitudinal direction of the grip with respect to the shaft, rather than bending rigidity of the shaft when an external force acts in a direction parallel to the direction. Is larger. Therefore, when the space between the molars (back teeth) is cleaned, that is, the cleaning portion is along the space between the molars in a posture in which the longitudinal direction of the grip portion in the cross section orthogonal to the axial direction of the shaft portion is substantially vertical. When the grip portion is operated so as to move, the bending of the shaft portion due to the strong pressing of the cleaning portion against the side surface for cleaning each side surface of the molar teeth adjacent to each other is suppressed. Furthermore, since the flexural rigidity of the shaft portion in the direction orthogonal to the direction in which the molars are lined up is relatively small, the irritation to the gums due to the cleaning portion coming into contact with the gums during cleaning between the teeth of the molars is reduced. Orthogonal.

In this case, with respect to the dimension of the shaft portion in the direction orthogonal to the longitudinal direction of the shaft portion in the cross section of the shaft portion in the plane orthogonal to the specific direction, the longitudinal direction of the shaft portion in the cross section. The ratio of the dimensions of the shaft portion is preferably 101% or more and 140% or less.

By doing so, the bending of the shaft portion during cleaning between the teeth of the molars is more reliably suppressed, and the irritation to the gums is further reduced.

Further, in this case, the grip portion from the tip of the cleaning portion of the interdental cleaning tool in a posture in which the longitudinal direction of the shaft portion in the cross section of the shaft portion in a plane orthogonal to the specific direction is parallel to the vertical direction. The first force required to press the part of the interdental cleaning tool 7 mm away from the tip of the cleaning part vertically downward by 5 mm in a state where the part separated by 15 mm is fixed to the side. Of the interdental cleaning tools, the pressing force is 0.6 N or more and 2 N or less, and the longitudinal direction of the shaft portion in the cross section of the shaft portion in a plane orthogonal to the specific direction is parallel to the horizontal. In a state where a portion separated by 15 mm from the tip of the cleaning portion to the grip portion side is fixed, the portion of the interdental cleaning tool separated by 7 mm from the tip of the cleaning portion toward the grip portion is pressed vertically downward by 5 mm. It is preferable that the second pressing force, which is the force required for the above, is 0.5 N or more and 1.95 N or less. When the first pressing force F1 is 100, the second pressing force F2 is preferably 102.6 to 400, more preferably 103.4 to 187.5, and even more preferably 103.4 to 125.

By doing so, the bending of the shaft portion during cleaning between the teeth of the molars is more reliably suppressed, and the irritation to the gums is further reduced.

The interdental cleaning tool according to another aspect of the present invention has a shaft portion having a shape that extends in a specific direction and can be inserted between teeth, and a shaft portion along the specific direction from the base end portion of the shaft portion. A base portion having a grip portion extending so as to be separated from the shaft portion and having a shape that can be gripped by a finger, and at least a part of the shaft portion can be covered and the space between teeth can be cleaned. It is equipped with a cleaning unit. The shaft portion has an insertion end portion on the opposite side of the base end portion in the specific direction. The dimension of the grip portion in the second direction orthogonal to both the specific direction and the first direction is larger than the dimension of the grip portion in the first direction orthogonal to the specific direction. Is getting bigger. The dimension of the shaft portion in the direction parallel to the first direction is larger than the dimension of the shaft portion in the direction parallel to the second direction. The cleaning portion includes a cleaning portion main body made of an elastomer having a hardness lower than the hardness of the base portion and covering the outer peripheral surface of the shaft portion, and the cleaning portion main body is the shaft in a plane orthogonal to the specific direction. About the direction parallel to the longitudinal direction of the shaft portion in the cross section of the portion The first covering portion which is a portion overlapping the shaft portion and the shaft portion in the direction parallel to the direction orthogonal to the longitudinal direction of the shaft portion in the cross section. The ratio of the thickness of the first covering portion to the dimension of the shaft portion in the direction parallel to the longitudinal direction of the shaft portion in the cross section including the second covering portion which is a portion overlapping with the shaft portion is 5% or more. The ratio of the thickness of the second covering portion to the dimension of the shaft portion in the direction parallel to the longitudinal direction of the shaft portion in the cross section is 10% or more and 60% or less. It is preferable that the thickness of the second coating portion is larger than the thickness of the first coating portion.

By doing so, the thickness of the cleaning portion main body is sufficiently smaller than the shaft portion in both the longitudinal direction of the shaft portion and the direction orthogonal to the longitudinal direction of the shaft portion in the cross section, so that the cleaning portion main body has the bending rigidity of the shaft portion. Since the influence on the anisotropy of the above is almost eliminated and the thickness of the second coating portion is larger than the thickness of the first coating portion, the irritation to the gums is more reliably reduced.

In this case, the cleaning unit further has a brush unit having a shape protruding outward from the outer peripheral surface of the cleaning unit main body in a direction orthogonal to the specific direction, and the brush unit is orthogonal to the specific direction. It is preferable to include a soft brush having a shape that protrudes outward from the second covering portion in a direction parallel to a direction orthogonal to the longitudinal direction of the shaft portion in the cross section of the shaft portion on a plane.

By doing so, the upper part between the teeth of the mandibular molars and the lower part between the teeth of the maxillary molars, which are particularly difficult to clean, are more effectively cleaned, and the irritation to the gums is also reduced. Specifically, since the soft brush is supported by the second covering portion having a thickness larger than the thickness of the first covering portion, it is said that the soft brush is provided on the outer peripheral surface of the first covering portion. The amount of displacement of the soft brush with respect to the shaft increases. Therefore, the upper part between the teeth of the lower molars and the lower part between the teeth of the upper molars are more effectively cleaned, and the irritation to the gums is also reduced.

As described above, according to the present invention, it is possible to provide an interdental cleaning tool capable of suppressing breakage of the shaft portion during cleaning between teeth and reducing irritation to the gums.

It is a front view of the interdental cleaning tool group of one Embodiment of this invention. FIG. 1 is a cross-sectional view taken along the line II-II of FIG. It is a figure which shows the outline of the measurement method of the 1st push pressure. It is a figure which shows the outline of the measuring method of the 2nd pressing force. It is a figure which shows the outline of the state that the interdental cleaning tool is inserted between the teeth of the molars (back teeth).

The interdental cleaning tool 2 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 shows a tooth cleaning tool group 1 including a plurality of tooth cleaning tools 2 (10 in this embodiment) connected to each other. The interdental cleaning tools 2 adjacent to each other are connected by a connecting portion 32. Each interdental cleaning tool 2 has a base 10 made of a synthetic resin and a cleaning part 40 made of an elastomer having a hardness lower than the hardness of the synthetic resin.

The base portion 10 has a shaft portion 20 and a grip portion 30. The base 10 is formed of a synthetic resin such as polypropylene, polyethylene, ABS, polybutylene terephthalate, polycarbonate, polyethylene terephthalate, polystyrene, and polyacetal. In this embodiment, the base 10 is formed of a synthetic resin containing 30% by weight of glass fiber.

The shaft portion 20 has a shape that extends linearly along a specific direction (left-right direction in FIG. 1) and can be inserted between teeth. An insertion end portion is formed at one end of the shaft portion 20 (left end in FIG. 1), and a base end portion is formed at the other end of the shaft portion 20. The shaft portion 20 has a shape in which the outer shape thereof gradually becomes smaller from the base end portion toward the insertion end portion. FIG. 2 shows a cross section of the shaft portion 20 and the cleaning portion 40 (hereinafter, referred to as “axis orthogonal cross section”) in a plane orthogonal to the axial direction of the shaft portion 20. As shown in FIG. 2, the shaft portion 20 has a dimension L1 in the first direction (left-right direction in FIG. 2) which is a direction orthogonal to the axial direction of the shaft portion 20 in the axis orthogonal cross section. It has a shape larger than the dimension L2 in the second direction (vertical direction in FIG. 2) orthogonal to both the direction and the first direction. The ratio of the dimension L1 to the dimension L2 is preferably set to 101% or more and 140% or less, and more preferably 103% or more and 125% or less. In this embodiment, this ratio is set to 108%.

The grip portion 30 extends along the axial direction of the shaft portion 20 so as to be separated from the base end portion of the shaft portion 20, and has a shape that can be gripped by a finger. The grip portion 30 is formed flat. Specifically, as shown in FIG. 2, the grip portion 30 has such that the longitudinal direction of the grip portion 30 in the axis orthogonal cross section is orthogonal to the first direction (longitudinal direction of the shaft portion 20 in the axis orthogonal cross section). It is connected to the base end.

The cleaning portion 40 is a portion for cleaning the space between teeth, and is formed of an elastomer having a hardness lower than the hardness of the base 10. In this embodiment, a styrene-based elastomer is used as the elastomer. However, as the elastomer, silicon, an olefin-based elastomer, a polyester-based elastomer, or the like may be used. In the present embodiment, the cleaning unit 40 has a cleaning unit main body 42 and a plurality of brush units 44. Further, as the hardness of the elastomer, the durometer hardness type A (JISK6253) is preferably 10 to 50, and in the present embodiment, the durometer hardness type A is 35.

The cleaning portion main body 42 has a shape that covers at least a part (a portion including the insertion end portion) of the outer peripheral surface of the shaft portion 20. The length of the cleaning unit main body 42 in the axial direction of the shaft unit 20 is set to 15.5 mm. As shown in FIG. 2, the outer shape of the cleaning unit main body 42 in the cross section orthogonal to the axis is circular. The cleaning unit main body 42 has a first covering portion 42a, which is a portion that overlaps the shaft portion 20 in a direction parallel to the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section, and a direction orthogonal to the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section. Includes a second covering portion 42b, which is a portion that overlaps the shaft portion 20 in a direction parallel to the shaft portion 20. The thickness t2 of the second covering portion 42b is larger than the thickness t1 of the first covering portion 42a.

Further, the ratio of the thickness t1 of the first covering portion 42a to the dimension L1 of the shaft portion 20 in the direction parallel to the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section may be set to 5% or more and 50% or less. It is preferably set to 10% or more and 40% or less, more preferably. In this embodiment, this ratio is set to 23%. The ratio of the thickness t2 of the second covering portion 42b to the dimension L2 of the shaft portion 20 in the direction parallel to the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section is set to 10% or more and 60% or less. It is preferably set to 15% or more and 45% or less. In this embodiment, this ratio is set to 28%.

Each brush portion 44 has a shape that protrudes outward from the outer peripheral surface of the cleaning portion main body 42 in a direction orthogonal to the axial direction of the shaft portion 20. In this embodiment, each brush portion 44 is formed in a conical shape. As shown in FIG. 2, the plurality of brush portions 44 are soft brushes having a shape protruding outward from the second covering portion 42b in a direction parallel to the direction orthogonal to the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section. Includes 44a.

In the present embodiment, the shaft portion 20 has a shape in which the dimension L1 in the first direction is larger than the dimension L2 in the second direction in the axis orthogonal cross section, and therefore the center of the shaft portion 20 in the axis orthogonal cross section. Rather than the cross-sectional secondary moment of the shaft portion 20 around the axis (weak axis) that passes through and parallel to the longitudinal direction of the shaft portion 20, it passes through the center of the shaft portion 20 and is in the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section. The cross-sectional secondary moment of the shaft portion 20 around the axis (strong axis) parallel to the orthogonal direction is larger. That is, the first pressing force F1, which is the force required to press the shaft portion 20 in the direction parallel to the longitudinal direction of the shaft portion 20 in the axially orthogonal cross section, is the longitudinal direction of the shaft portion 20 in the axially orthogonal cross section. It is larger than the second pressing force F2, which is the force required to press the shaft portion 20 in the direction parallel to the orthogonal direction.

FIG. 3 shows a method for measuring the first pressing force F1, and FIG. 4 shows a method for measuring the second pressing force F2. The first pressing force F1 is a portion of the interdental cleaning tool 2 separated from the tip of the cleaning portion 40 by 15 mm toward the grip portion 30 in a posture in which the longitudinal direction of the shaft portion 20 is parallel to the vertical in the cross section perpendicular to the axis. In the state of being fixed by the fixing jig 51, it is necessary to press the portion of the interdental cleaning tool 2 that is 7 mm away from the tip of the cleaning portion 40 toward the grip portion 30 by the pressing force measuring device 52 vertically downward by 5 mm. It is power. The second pressing force F2 fixes a portion of the interdental cleaning tool 2 15 mm away from the tip of the cleaning portion 40 toward the grip portion 30 in a posture in which the longitudinal direction of the shaft portion 20 is orthogonal to the vertical in the axial orthogonal cross section. In the state of being fixed by the jig 51, the force required to press the portion of the interdental cleaning tool 2 that is 7 mm away from the tip of the cleaning portion 40 toward the grip portion 30 by the pressing force measuring device 52 vertically downward by 5 mm. Is.

Specifically, the measurement of the first pressing force F1 is performed as follows. That is, the pressing force measuring instrument 52 is vertically downward 5 mm at 20 mm / min from the state where the pressing force measuring instrument 52 is in contact with the portion of the interdental cleaning tool 2 which is 7 mm away from the tip of the cleaning portion 40 toward the gripping portion 30. Displace. As the shaft portion 20 bends due to the pressing by the pressing force measuring device 52, the portion is displaced vertically downward by 5 mm. Then, the pressing force at this time, that is, the first pressing force F1, is measured by the pressing force measuring device 52. The same applies to the second pressing force F2. In this embodiment, the first pressing force F1 is 1.36N. The second pressing force F2 is 1.22N. As the pressing force measuring device 52, AUTOGRAPH AGS-J 1kN (manufactured by Shimadzu Corporation) and an attached attachment for force gauge (manufactured by Imada Co., Ltd./A type S-4) were used.

The first pressing force F1 is preferably 0.6N or more and 2N or less, and more preferably 1N or more and 1.5N or less. The second pressing force F2 is preferably 0.5 N or more and 1.95 N or less, and more preferably 0.8 N or more and 1.45 N or less. In other words, the cross-sectional shape of the shaft portion 20 is set so that the first pressing force F1 is 0.6N or more and 2N or less and the second pressing force F2 is 0.5N or more and 1.95N or less.

Next, with reference to FIG. 5, a case where the interdental cleaning tool 2 described above is used to particularly clean the interdental space between the molars (back teeth) T will be described. When the interdental cleaning tool 2 including the grip portion 30 formed flat and the shaft portion 20 having a linearly extending shape as in the present embodiment cleans the interdental space between the molar teeth T, the interdental space is concerned. As shown in FIG. 5, the user of the cleaning tool 2 grips the grip portion 30 in a posture in which the longitudinal direction of the grip portion 30 is substantially vertical in the cross section perpendicular to the axis, and the cleaning portion 40 is held by the teeth of the molars T. It is often inserted into the oral cavity toward the interval. Then, the user operates the grip portion 30 so that the cleaning portion 40 moves along the space between the teeth. At this time, since the cleaning portion 40 is also pressed against the side surface of the molar tooth T, the side surface and the space between the teeth are effectively cleaned.

In the interdental cleaning tool 2 of the present embodiment, the direction perpendicular to the longitudinal direction of the grip portion 30 in the axis orthogonal cross section is more than the dimension L2 of the shaft portion 20 in the direction parallel to the longitudinal direction of the grip portion 30 in the axis orthogonal cross section. Since the dimension L1 of the shaft portion 20 in the parallel direction is larger (because the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section is orthogonal to the longitudinal direction of the grip portion 30 in the axis orthogonal cross section), the shaft portion 20 On the other hand, the bending rigidity of the shaft portion 20 when an external force in a direction parallel to the longitudinal direction of the grip portion 30 in the axially orthogonal cross section acts is more orthogonal to the longitudinal direction of the grip portion 30 in the axially orthogonal cross section with respect to the shaft portion 20. The bending rigidity of the shaft portion 20 is larger when an external force in a direction parallel to the cross-section is applied. Therefore, when the space between the teeth of the molars T is cleaned, that is, the cleaning portion 40 moves along the space between the teeth of the molars T in a posture in which the longitudinal direction of the grip portion 30 in the axially orthogonal cross section is substantially vertical. When the grip portion 30 is operated, the bending of the shaft portion 20 due to the cleaning portion 40 being strongly pressed against the side surfaces in order to clean the side surfaces of the molar teeth T adjacent to each other is suppressed. Further, since the flexural rigidity of the shaft portion 20 in the direction orthogonal to the direction in which the molars T are lined up is relatively small, the gum G is caused by the cleaning portion 40 coming into contact with the gum G during cleaning between the teeth of the molars T. The irritation to the gums is reduced.

Further, since the ratio of the longitudinal dimension L1 of the shaft portion 20 in the axis orthogonal cross section to the dimension L2 in the direction orthogonal to the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section is 101% or more and 140% or less, the molar tooth T. The bending of the shaft portion 20 during cleaning between the teeth is more reliably suppressed, and the irritation to the gum G is further reduced.

Further, since the first pressing force F1 is 0.6N or more and 2N or less and the second pressing force F2 is 0.5N or more and 1.95N or less, the shaft during cleaning between the molar teeth T is being cleaned. The breakage of the portion 20 is more reliably suppressed, and the irritation to the gum G is further reduced.

Further, in the present embodiment, the ratio of the thickness t1 of the first covering portion 42a to the dimension L1 of the shaft portion 20 is 5% or more and 50% or less, and the second covering portion 42b of the shaft portion 20 with respect to the dimension L2. The ratio of the thickness t2 is 10% or more and 60% or less. Therefore, the thickness of the cleaning unit main body 42 is sufficiently smaller than that of the shaft portion 20 in both the longitudinal direction of the shaft portion 20 and the direction orthogonal to the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section, so that the cleaning portion main body 42 is the shaft portion 20. The effect of the bending rigidity on the anisotropy is almost eliminated. Further, since the thickness t2 of the second covering portion 42b is larger than the thickness t1 of the first covering portion 42a, the irritation to the gum G is more reliably reduced.

Further, since the brush portion 44 includes a soft brush 44a having a shape protruding outward from the second covering portion 42b, the upper part between the teeth of the lower jaw and the gap between the teeth of the upper jaw, which are particularly difficult to clean. The lower part of the brush is cleaned more effectively, and the irritation to the gums is reduced. Specifically, since the soft brush 44a is supported by the second covering portion 42b having a thickness t2 larger than the thickness t1 of the first covering portion 42a, the soft brush 44a is the outer peripheral surface of the first covering portion 42a. The amount of displacement of the soft brush 44a with respect to the shaft portion 20 is larger than that in the case where the soft brush 44a is provided. Therefore, the upper part between the teeth of the lower molars and the lower part between the teeth of the upper molars are more effectively cleaned, and the irritation to the gum G is also reduced.

It should be noted that the above-described embodiment disclosed this time is exemplary in all respects and is not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the embodiment described above, and further includes all modifications within the meaning and scope equivalent to the scope of claims.

For example, the cross-sectional shape of the shaft portion 20 is not limited to the example of the above embodiment. The cross-sectional shape of the shaft portion 20 can be set to an arbitrary shape (oval shape, polygonal shape, etc.) in which a strong axis and a weak axis exist.

1 Inter-tooth cleaning tool group 2 Inter-tooth cleaning tool 10 Base 20 Shaft 30 Grip 40 Cleaning 42 Cleaning main body 42a 1st covering 42b 2nd covering 44 Brush 44a Soft brush

Claims (5)

A shaft portion that extends in a specific direction and has a shape that can be inserted between teeth, and a shaft portion that extends from the base end portion of the shaft portion along the specific direction so as to be separated from the shaft portion, and is extended by a finger. A grip portion having a shape capable of being gripped, a base having a grip portion, and a base portion having a grip portion.
A cleaning portion that covers at least a part of the shaft portion and can clean the space between teeth is provided.
The shaft portion has an insertion end portion on the opposite side of the base end portion in the specific direction.
The dimension of the grip portion in the second direction orthogonal to both the specific direction and the first direction is larger than the dimension of the grip portion in the first direction orthogonal to the specific direction. Is big,
In the shaft portion, the dimension of the shaft portion in the direction parallel to the first direction is larger than the dimension of the shaft portion in the direction parallel to the second direction over the entire length of the shaft portion. An interdental cleaning tool that is formed to be large . In the interdental cleaning tool according to claim 1,
Of the shaft portion with respect to the longitudinal direction of the shaft portion in the cross section with respect to the dimension of the shaft portion in the direction orthogonal to the longitudinal direction of the shaft portion in the cross section of the shaft portion in a plane orthogonal to the specific direction. Interdental cleaning tool with a dimension ratio of 101% or more and 140% or less. In the interdental cleaning tool according to claim 2,
In a posture in which the longitudinal direction of the shaft portion in the cross section of the shaft portion in a plane orthogonal to the specific direction is parallel to the vertical direction, the interdental cleaning tool is separated from the tip of the cleaning portion by 15 mm toward the grip portion. In the state where the portion is fixed, the first pressing force, which is the force required to press the portion of the interdental cleaning tool 7 mm away from the tip of the cleaning portion toward the grip portion side by 5 mm vertically downward, is 0. The tip of the cleaning portion of the interdental cleaning tool in a posture of 6N or more and 2N or less and the longitudinal direction of the shaft portion in the cross section of the shaft portion in a plane orthogonal to the specific direction is parallel to the horizontal. The force required to press the part of the interdental cleaning tool 7 mm away from the tip of the cleaning part vertically downward by 5 mm in a state where the part separated from the grip portion side by 15 mm is fixed. An interdental cleaning tool having a second pressing force of 0.5 N or more and 1.95 N or less. A shaft portion that extends in a specific direction and has a shape that can be inserted between teeth, and a shaft portion that extends from the base end portion of the shaft portion along the specific direction so as to be separated from the shaft portion, and is extended by a finger. A grip portion having a shape capable of being gripped, a base having a grip portion, and a base portion having a grip portion.
A cleaning portion that covers at least a part of the shaft portion and can clean the space between teeth is provided.
The shaft portion has an insertion end portion on the opposite side of the base end portion in the specific direction.
The dimension of the grip portion in the second direction orthogonal to both the specific direction and the first direction is larger than the dimension of the grip portion in the first direction orthogonal to the specific direction. Is big,
The dimension of the shaft portion in the direction parallel to the first direction is larger than the dimension of the shaft portion in the direction parallel to the second direction.
The cleaning portion includes a cleaning portion main body made of an elastomer having a hardness lower than the hardness of the base portion and covering the outer peripheral surface of the shaft portion.
The cleaning unit body
A first covering portion that is a portion that overlaps with the shaft portion in a direction parallel to the longitudinal direction of the shaft portion in a cross section of the shaft portion in a plane orthogonal to the specific direction.
A second covering portion, which is a portion overlapping the shaft portion in a direction parallel to the direction orthogonal to the longitudinal direction of the shaft portion in the cross section, is included.
The ratio of the thickness of the first covering portion to the dimension of the shaft portion in the direction parallel to the longitudinal direction of the shaft portion in the cross section is 5% or more and 50% or less.
The ratio of the thickness of the second covering portion to the dimension of the shaft portion in the direction parallel to the direction orthogonal to the longitudinal direction of the shaft portion in the cross section is 10% or more and 60% or less.
An interdental cleaning tool in which the thickness of the second covering portion is larger than the thickness of the first covering portion. In the interdental cleaning tool according to claim 4,
The cleaning unit further has a brush unit having a shape protruding outward from the outer peripheral surface of the cleaning unit main body in a direction orthogonal to the specific direction.
The brush portion is a soft having a shape that protrudes outward from the second covering portion in a direction parallel to a direction orthogonal to the longitudinal direction of the shaft portion in a cross section of the shaft portion in a plane orthogonal to the specific direction. Intertooth cleaning equipment, including brushes.

Images