JP2016104383A - Interdental cleaning tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interdental cleaning tool of ISO size 1 and ISO size 2, endurable in practical use by setting a cross sectional area of a core part large, and setting a length of a cleaning part, allowing insertion between teeth long while sufficiently securing hardness rigidity of the cleaning part.SOLUTION: An interdental cleaning tool 1 is obtained by coating and molding a cleaning soft part 21 comprising an elastomer on a core part 12 comprising a synthetic resin and forming a cleaning part 2 to be inserted between teeth by the core part 12 and the cleaning soft part 21. The core part 12 is constituted of a core side taper surface 12a tapered toward the tip thereof, and the cleaning part 2 is constituted of a cleaning side taper surface 2a tapered toward the tip thereof. Angles θ1 and θ2 made by both taper surfaces 12a and 2a to a center line L of the core part 12 are set to become continuously or gradually small toward the tip of the core part 12.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an interdental cleaning tool having a cleaning portion covered with an elastomer.

  As an interdental cleaning tool, an interdental cleaning tool (interdental) comprising a brush portion made up of a core portion composed of two wire wires twisted together and a filament implanted between the two wire thin wires Brushes are widely used, but recently, a soft part for cleaning made of elastomer is coated on the core part made of synthetic resin, and the cleaning part is inserted between the teeth by the core part and the soft part for cleaning. Various interdental cleaning tools in which the shape is formed have been proposed and put to practical use (for example, see Patent Documents 1 to 3).

Japanese Patent No. 4236571 Japanese Patent No. 3002668 Special table 2001-506514 gazette

  By the way, the latter interdental cleaning tool using an elastomer can soften the contact between the teeth and the gingiva as compared with the former interdental cleaning tool, but the core part is made of a synthetic resin material. Therefore, if the core part is made thin, the length that can be inserted between the teeth can be secured sufficiently, and the cleanability between the teeth can be improved, but the cleaning part is easily broken, and if the core part is thickened, the strength of the cleaning part is increased. However, the length that can be inserted between the teeth is shortened, and there is a problem that the cleaning property is deteriorated.

  Normally, the outer peripheral surface of the cleaning part is composed of a single taper surface that decreases in diameter as it goes to the tip side, but if the angle of the taper surface with respect to the center line of the cleaning part is set small, the gap between teeth Sufficiently insertable length can be secured to improve the cleanability between teeth, but the diameter of the base portion of the core portion is inevitably reduced, and the cleaning portion is easily broken by the bending load acting on the base portion of the cleaning portion, Moreover, if the angle of the taper surface of the cleaning part is set large, the diameter of the base part of the core part can be increased and the base part strength rigidity of the cleaning part can be increased, but the length of the cleaning part that can be inserted between teeth is short. As a result, there was a problem that sufficient cleanability could not be obtained.

  In particular, ISO size 1 set according to ISO16409, which can pass through holes with a diameter of 0.7 mm to 0.8 mm, and ISO size 2 that can pass through holes with a diameter of 0.9 mm to 1.0 mm, etc. In an interdental cleaning tool having a cleaning part, the diameter of the core part is inevitably thick to ensure sufficient strength of the cleaning part, and the cleaning part cannot be inserted between teeth, or inserted between the teeth of the cleaning part. The possible length has become as short as 4 mm to 5 mm, for example, and it has not been possible to produce a product that can withstand practical use.

  The object of the present invention is to set the cross-sectional area of the core part large and ensure the strength and rigidity of the cleaning part sufficiently, while setting the length of the cleaning part that can be inserted between the teeth long to withstand practical use. It is to provide an interdental cleaning tool of ISO size 1 or ISO size 2.

  The interdental cleaning tool according to the present invention is formed by covering and molding a cleaning soft part made of elastomer on a synthetic resin core part, and forming a cleaning part inserted between the teeth by the core part and the cleaning soft part. In the interdental cleaning tool, the core portion is constituted by a core side taper surface that is reduced in diameter as it goes to the tip end side, and the cleaning portion is constituted by a cleaning side taper surface that is reduced in diameter as it goes to the tip end side. The angle formed by both tapered surfaces with respect to the center line of the core portion is set so as to decrease continuously or stepwise as it goes to the tip side of the core portion.

  In this interdental cleaning tool, a core made of synthetic resin is coated with a cleaning soft part made of elastomer, and a cleaning part inserted between the teeth is formed by the core part and the soft cleaning part. Therefore, the contact of the interdental cleaning tool to the interdental or gingiva during interdental cleaning can be made soft, and the feeling of use of the interdental cleaning tool can be improved. In addition, the outer peripheral surface of the core portion and the cleaning portion is a tapered surface that decreases in diameter as it goes to the distal end side of the core portion, and the angle formed by the tapered surface with respect to the center line of the core portion goes to the distal end side of the core portion. Therefore, the core side taper surface and the cleaning side taper surface set so as to decrease continuously or stepwise are provided, so that the cross-sectional area of the core part is sufficiently secured and the strength of the cleaning part during interdental cleaning is achieved. Inter-dental cleaning of ISO size 1 and ISO size 2 that can secure the length of the cleaning part that can be inserted between teeth and can withstand practical use by preventing the rigidity and making the tip side small in diameter. The tool can be realized.

Here, the cross-sectional area at a position 5 mm from the front end of the cleaning unit is set to 0.4 to 0.6 mm ² , and the cross-sectional area at a position 10 mm from the front end of the cleaning unit is 0.75 to 1.00 mm. Setting to ² is a preferred embodiment. By comprising in this way, the interdental cleaning tool of ISO size 1 or ISO size 2 which can fully ensure the length of the cleaning part which can be inserted between teeth is realizable.

  As the cleaning-side taper surface, two types of taper surfaces having different angles with respect to the center line of the core or different angle change rates can be formed. In addition, the base end side of the crossing line between the cleaning-side tapered surface and the cross section including the center line of the core portion is formed to have a shape along the first arc, and the tip end side is formed more than the first arc. It can be formed to have a shape along the second arc having a large diameter. By comprising in this way, the interdental cleaning tool of ISO size 1 or ISO size 2 which can fully ensure the length of the cleaning part which can be inserted between teeth is realizable.

  In a preferred embodiment, the thickness of the cleaning soft portion is set to be substantially the same over the entire length of the cleaning portion. In this case, it is possible to improve the moldability of the cleaning soft part by the elastomer material.

In a preferred embodiment, the core portion is formed in a linear and elongated shaft shape.
In addition, in a preferred embodiment, the distal end portion of the core member is formed in a partial spherical shape, and the cross-sectional area of the proximal end portion is set to 0.15 mm ² or more. By configuring in this way, the strength and rigidity of the tip of the cleaning unit is increased, and the back side between the teeth opposite to the insertion side of the cleaning unit is also effective by the tip of the cleaning unit pierced between the teeth. It becomes possible to clean.

  An annular insertion restricting portion made of an elastomer for restricting the insertion limit position of the cleaning portion with respect to the gap between teeth is connected to the base end portion of the cleaning soft portion at the base end portion of the cleaning portion, and the outer periphery of the base portion of the core portion It is also a preferred embodiment to form outwardly projecting on the surface. In this case, the insertion restricting portion can restrict the maximum insertion length of the cleaning portion with respect to the gap between teeth, and avoids a load on the core due to excessive insertion, thereby preventing shaft breakage and inserting the restricting portion into the gingiva. By bringing it into contact with the gingiva, a massage effect on the gums can be expected. Further, when forming the interdental cleaning tool, once the elastomer material is temporarily stored in the insertion restricting portion forming space for forming the insertion restricting portion, the entire portion of the elastomer is formed on the base of the cleaning portion forming space for forming the cleaning soft portion. Since the elastomer material can be supplied so as to be uniform, molding defects of the cleaning soft portion can be effectively prevented.

  In a preferred embodiment, a handle base made of synthetic resin is provided as a handle, and the core portion is connected to the tip of the handle base. In addition, an annular non-slip portion made of an elastomer is formed on the outer peripheral portion of the handle base material in the longitudinal direction, and the handle base material is made of an elastomer that connects the anti-slip portion and the cleaning soft portion. It is a preferred embodiment to provide a portion. If comprised in this way, since the slip of an interdental cleaning tool can be prevented by a slip prevention part, the handleability of an interdental cleaning tool can be improved. Also, when forming the interdental cleaning tool, the elastomer material is temporarily stored in the anti-slip part forming space for forming the anti-slip part, and from this anti-slip forming space, through a plurality of supply paths for forming the connecting part, for cleaning. Since the elastomer material can be supplied to the base portion of the cleaning portion forming space for forming the soft portion so as to be uniform over the entire circumference, it is possible to effectively prevent molding defects in the soft portion for cleaning.

The handle base material may be formed in the shape of an elongated flat bar, and the connecting portion may be formed along the length direction of the handle base material so as to correspond to the center part in the width direction of both wide surfaces of the handle base material. This is a preferred embodiment. In this case, when using the interdental cleaning tool, it is easy to hold the interdental cleaning tool because the handle and the wide fingers of the handle base can be gripped with the thumb and forefinger. Since the connecting portion made of an elastomer is formed on the connecting portion, not only the anti-slip portion but also the connecting portion can prevent the held finger from slipping, and the handling performance of the interdental cleaning tool can be improved.
The handle base material has a handle base material main body and a tapered base material portion connected to a distal end portion of the handle base material main body, and the tapered base material portion is curved in the width direction of the handle base material main body. In addition, it is preferable that the taper is formed in a tapered shape in the width direction and the thickness direction so as to become narrower and thinner as it goes to the tip side.

  It is a preferred embodiment that a recess or a through hole for reducing the synthetic resin material is formed in the handle base material. By constructing in this way, the material used for the base material can be saved, and the production cost of the interdental cleaning tool can be reduced, and the design of the interdental cleaning tool can be improved by using the recesses and through holes. When the interdental cleaning tool is accommodated in the packaging blister container or the like, the interdental cleaning tool can be fixed to the blister container, which is preferable.

  Preferably, the cleaning soft portion includes a covering portion that covers the core portion, and a plurality of protruding portions that are formed on the covering portion so as to protrude outwardly at intervals in the length direction. It is.

  In a preferred embodiment, the synthetic resin material constituting the core portion and the elastomer material constituting the cleaning soft portion are made of compatible materials. In this case, since the soft part for cleaning can be effectively prevented from being peeled off from the core material, an interdental cleaning tool having excellent durability can be realized.

  According to the interdental cleaning tool of the present invention, a synthetic resin core part is coated with a cleaning soft part made of an elastomer, and the cleaning part is inserted between the teeth by the core part and the cleaning soft part. Therefore, the contact of the interdental cleaning tool against the interdental or gingiva during interdental cleaning can be made soft, and the feeling of use of the interdental cleaning tool can be improved. In addition, the outer peripheral surface of the core portion and the cleaning portion is a tapered surface that decreases in diameter as it goes to the distal end side of the core portion, and the angle formed by the tapered surface with respect to the center line of the core portion goes to the distal end side of the core portion. Therefore, the core side taper surface and the cleaning side taper surface set so as to decrease continuously or stepwise are provided, so that the cross-sectional area of the core part is sufficiently secured and the strength of the cleaning part during interdental cleaning is achieved. Inter-dental cleaning of ISO size 1 and ISO size 2 that can secure the length of the cleaning part that can be inserted between teeth and can withstand practical use by preventing the rigidity and making the tip side small in diameter. The tool can be realized.

(A) of the interdental cleaning tool is a front view, and (b) is a side view. 1A is a sectional view taken along the line aa, FIG. 1B is a sectional view taken along the line bb, FIG. 1C is a sectional view taken along the line cc, and FIG. 1D is a sectional view taken along the line dd. Enlarged view of the cleaning section (A) of the base material part is a front view, and (b) is a side view. 4A is a sectional view taken along the line aa, and FIG. 4B is a sectional view taken along the line bb. Explanatory drawing of molding method of base material part Explanatory drawing of molding method of soft part Explanatory drawing of image analysis part of jaw model used in evaluation test

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Interdental cleaning tool>
As shown in FIGS. 1 to 3, the interdental cleaning tool 1 is provided with a cleaning part 2 for interdental cleaning and a handle part 3 as a handle when distinguished by its function. A base material portion 10 made of a synthetic resin and a soft portion 20 made of an elastomer are provided.

(Base material part)
As shown in FIGS. 1 to 5, the base portion 10 made of a synthetic resin includes a flat and slender bar-shaped handle base 11 that can be picked and held by a finger, and teeth that are connected to the tip of the handle base 11. A small-diameter, elongated shaft-shaped core portion 12 that can be inserted therebetween is provided.

  The handle base material 11 has a flat and slender plate-like handle base body main body 11a having a rectangular cross section, and a tapered base material portion 11b having a rectangular cross section continuously provided at the tip of the handle base body 11a. The portion 11b is gently curved in the width direction of the handle base body 11a, and is formed in a tapered shape in the width direction and the thickness direction so as to become narrower and thinner as it goes to the distal end side. A ridge 13 extending from the core 12 to the handle base body 11a is formed at the center in the width direction of both wide surfaces of the tapered base 11b, and an annular recess 14 is formed in the middle of the handle base 11a. Has been. However, as the handle base material 11, any shape can be adopted as long as it is a shape that can be easily picked by fingers and cleaned between teeth. Reference numeral 15 denotes a handle base material for fixing the interdental cleaning tool 1 at the time of packaging, saving the synthetic resin material constituting the base material portion 10, improving the design of the interdental cleaning tool 1, and the like. 11 is a through-hole 15 formed in 11. The formation position, size, and number of the through holes 15 can be arbitrarily set. In addition, it is possible to form a recess in the handle base 11 instead of the through hole 15 or to form a recess in the handle base 11 in combination with the through hole 15.

  The core part 12 is formed in a substantially straight and slender shaft shape, and on the outer peripheral surface of the core part 12, a gentle core side taper surface 12a is formed, whose diameter decreases toward the tip side. The length of the core part 12 can be set to any length that allows interdental cleaning, and can be set to, for example, 7 mm to 20 mm. The angle θ1 formed by the core-side tapered surface 12a with respect to the center line L of the core portion 12 is set so as to decrease continuously or stepwise as going to the distal end side of the core portion 12. The intersecting line segment between the core-side tapered surface 12a and the cross section including the center line L of the core portion 12 can be formed in a straight line shape, or can be formed in a curved shape such as an arc shape or an elliptic arc shape.

  When the angle θ1 is changed in stages, the angle θ1 can be switched to an arbitrary stage of one or more stages. Moreover, the position where the angle θ1 is switched can be set to an arbitrary position in the length direction of the core portion 12. For example, when the angle θ1 formed by the core-side tapered surface 12a with respect to the center line L of the core portion 12 is in the range of 5 mm to 8 mm from the distal end portion of the core portion 12 to the proximal end side, θ1 = 0.4 ° to 2.9 °. In a range from 8 mm to the base end side from a position 8 mm away from the tip end portion of the core portion 12, θ1 = 0.8 ° to 2.9 ° can be set. When the angle θ1 is continuously changed, an intersection line segment between the core-side tapered surface 12a and the cross section including the center line L of the core portion 12 is formed in a shape along, for example, one arc. For example, the shape is formed along a curve such as one quadratic curve. Moreover, it is also possible to form in the shape which combined several types of circular arc and curve from which curvature differs. In the case of forming the shape along two arcs, it is preferable to set the diameter of the second arc on the distal end side to be larger than the diameter of the first arc on the proximal end side. Specifically, as shown in FIG. 4, by setting the radius R1 of the distal end portion of the core 12 to 24.7 mm, for example, and setting the radius R2 of the proximal end portion to 23.9 mm, the core 12 Thus, the angle θ1 is configured to be continuously reduced as it goes to the tip side.

The tip portion of the core portion 12 is formed in a portion spherical, with the cross-sectional area of the base is set to 0.15 mm ² or more ～0.25Mm ² or less, the core portion 12 from the tip portion of 5mm~8mm The diameter of the tip side portion of the core portion 12 is set to 0.35 mm to 0.60 mm, and the strength and rigidity of the tip portion of the cleaning portion 2 is increased, and cleaning is performed by the tip portion of the cleaning portion 2 pierced between teeth. It is comprised so that the back side between teeth opposite to the insertion side of the part 2 can also be effectively cleaned. The diameter of the base portion of the core portion 12 is set to 0.8 mm to 2.0 mm so that the base portion of the core portion 12 is not deformed when the elastomer material is filled. In addition, the cross-sectional shape of the core part 12 can also be formed in elliptical shapes and polygonal shapes other than circular.

  Synthetic resin materials for the substrate 10 include polypropylene, polyethylene, polyethylene terephthalate, polycyclohexylenedimethylene terephthalate, saturated polyester resin, polymethyl methacrylate, cellulose propionate, polyurethane, polyamide, polycarbonate, ABS (acrylonitrile butadiene butadiene). A thermoplastic synthetic resin material such as styrene can be used. In particular, a saturated polyester resin excellent in insertion property and bending is preferable. Furthermore, you may add additives, such as glass fiber, from the point which raises an intensity | strength.

(Soft part)
As shown in FIGS. 1 to 3, the soft portion 20 is formed integrally with the base material portion 10 using an elastomer material, and includes a cleaning soft portion 21 sheathed on the core portion 12, and a cleaning soft portion 21. The insertion restricting portion 22 that is connected to the base portion and is externally attached to the base end portion of the core portion 12, the first anti-slip portion 23 provided in the annular recess 14 of the handle base body 11a, and the tapered base portion 11b of the handle base 11 A second anti-slip portion 24 provided in the middle of the first anti-slip portion 24, a first connecting portion 25 connecting the first anti-slip portion 23 and the second anti-slip portion 24, a second anti-slip portion 24 and the insertion restricting portion 22. And a second connecting portion 26 for connecting the two.

  The cleaning soft portion 21 includes a covering portion 21a that is covered with the core portion 12 and a plurality of protruding portions 21b that are formed on the covering portion 21a so as to protrude outward at intervals in the length direction. .

  If the thickness of the covering portion 21a is too thick, the diameter of the covering portion 21a becomes large and the insertability between the teeth decreases, and if it is too thin, the elastomer material cannot be filled up to the tip of the cleaning portion 2; It will be set to ~ 0.2 mm. The cross-sectional shape of the covering portion 21a is preferably formed in a circular shape, but may be formed in an elliptical shape or a polygonal shape other than a circular shape. The thickness of the covering portion 21a can be configured to be thinner as it goes to the distal end side or thinner as it goes to the proximal end side, but is preferably set uniformly.

  The protrusions 21b are formed at intervals in the length direction of the covering portion 21a, and at 90 ° intervals with respect to the circumferential direction of the covering portion 21a. Further, the protrusions 21b adjacent to each other in the circumferential direction are arranged at a position shifted by 1/4 pitch in the length direction, and the protrusions 21b are arranged along a spiral that goes around the covering part 21a. However, the protrusion 21b can be formed with an array pattern other than those described above.

The cross-sectional area, length, number, and arrangement pitch of the base end portion of the protruding portion 21b can be arbitrarily set, but the cross-sectional area of the base end portion of the protruding portion 21b is set in consideration of moldability and cleanability. , preferably set to approximately 0.03mm ² ~1.50mm ^2, the length of the projecting portion 21b is preferably set to approximately 0.5 mm to 2.0 mm, the number of the protrusions 21b is 20 to 100 It is preferable to set them individually, and the arrangement pitch of the protrusions 21b is preferably set to 0.5 mm to 1.5 mm. Moreover, although the cone-shaped thing was employ | adopted as the projection part 21b, the flat taper-shaped thing flat in an axial direction is also employable. Furthermore, as a cross-sectional shape of the protrusion 21b, an arbitrary cross-sectional shape such as an ellipse or a polygon can be adopted in addition to a circular shape.

  On the outer peripheral surface of the cleaning portion 2 (excluding the protruding portion 21b), a gentle cleaning-side taper surface 2a having a diameter decreasing toward the tip side is formed. The angle θ2 formed by the cleaning-side tapered surface 2a with respect to the center line L of the core portion 12 is set so as to decrease continuously or stepwise as it goes to the distal end side of the cleaning portion 2. The intersecting line segment between the cleaning-side tapered surface 2a and the cross section including the center line L of the core portion 12 can be formed in a straight line shape, or can be formed in a curved shape such as an arc shape or an elliptic arc shape.

  The angle θ2 of the cleaning side taper surface 2a in each part in the length direction of the cleaning part 2 is set to be the same as the angle θ1 of the core side taper surface 12a in the corresponding position in the length direction of the core part 12, and the thickness of the covering part 21a. The length is uniformly set over the entire length of the cleaning unit 2. However, the angle θ2 at each part in the length direction of the cleaning part 2 and the angle θ1 at the position in the length direction of the core part 2 corresponding to the angle θ2 are partially or entirely set to different angles, for example, the cleaning part The thickness of the covering portion 21a is set to be thicker as it goes to the base side of 2, the thickness of the covering portion 21a is set to be thicker as it goes to the tip side of the cleaning portion 2, and the covering at the middle portion of the cleaning portion 2 is set It is possible to set the thickness of the portion 21a to be partially thick.

Sectional area in the cross-sectional area of 5mm in position from the distal end of the cleaning unit 2 (except for the protrusion 21b) ^is set to 0.4mm ² ~0.6mm 2, 10mm position from the tip of the cleaning unit 2 (except for the protrusion 21b) ^is set to 0.75mm ² ~1.00mm 2. When the cross-sectional shape of the covering portion 21a is configured to be a circle, the diameter of the covering portion 21a at a position 5 mm from the distal end portion of the cleaning portion 2 is set to 0.7 mm to 0.9 mm, and from the distal end portion of the cleaning portion 2 The diameter of the covering portion 21a at the position of 10 mm is set to 0.95 mm to 1.1 mm. By setting in this way, ISO size 1 that can pass through holes with a diameter of 0.7 mm to 0.8 mm and ISO size 2 that can pass through holes with a diameter of 0.9 mm to 1.0 mm conforming to ISO16409. The interdental cleaning tool 1 which has the cleaning part 2 is realizable.

  The insertion restricting portion 22 is formed in an annular shape along the outer periphery of the base portion of the core portion 12 so as to be continuous with the entire circumference of the base portion of the cleaning soft portion 21. The maximum insertion length is restricted. Moreover, since the insertion control part 22 is comprised with the elastomer, the massage effect to a gum can also be anticipated by making the insertion control part 22 contact | abut to a gum. Although the thickness and width of the insertion restricting portion 22 can be arbitrarily set, in order to prevent molding defects of the cleaning soft portion 21, for example, the thickness is 1.0 mm to 2.5 mm and the width is 1.2 mm to 3 mm. It is preferable to set to 0.0 mm.

  The first anti-slip part 23 is packaged so as to fill the annular recess 14 formed in the handle base body 11a, and the second anti-slip part 24 is along the outer periphery of the middle part of the tapered base part 11b of the handle base 11 It is formed in an annular shape. The width | variety of the 1st antiskid part 23 can be set arbitrarily. Further, if the thickness of the first anti-slip portion 23 is too thin, defective filling of the elastomer material occurs, and if it is too thick, the handle portion 3 is uncomfortable when held with a finger, so that the thickness is 0.1 mm to 0.5 mm. It is preferable to set to. Moreover, in order to prevent the molding defect of the soft part 20, it is preferable to set the width | variety of the 2nd antiskid part 24 to 1.0 mm-6.0 mm, and the thickness of the 2nd antiskid part 24 is too thin. Insufficient filling of the elastomer material occurs, and if it is too thick, it is uncomfortable when the handle portion 3 is held with a finger, so it is preferable to set the thickness to 0.1 mm to 0.5 mm. In this way, by forming the first anti-slip part 23 so as to fill the annular recess 14, the first anti-slip part 23 is prevented from being peeled off, and the second anti-slip part 13 is covered so as to cover the protrusion 13. By forming the non-slip portion 24, the second anti-slip portion 24 is prevented from being peeled off.

  The 1st connection part 25 and the 2nd connection part 26 are so that the protrusion 13 formed in the taper base material part 11b of the handle base material 11 may be covered in the center part of the width direction of both wide surfaces of the taper base material part 11b. It is provided along the ridge 13. Thus, the 1st connection part 25 and the 2nd connection part 26 are formed, and it is comprised so that peeling of the 1st connection part 25 and the 2nd connection part 26 may be prevented.

  The first connecting portion 25 is provided to supply an elastomer material from the second anti-slip portion 24 to the first anti-slip portion 23 when the soft portion 20 is formed, and the second connecting portion 26 is formed of the soft portion 20. Sometimes it is provided to supply the elastomer material from the second anti-slip part 24 to the cleaning soft part 21 via the insertion restricting part 22. The widths of the connecting portions 25 and 26 can be arbitrarily set. However, if the width is too narrow, filling of the elastomer material is likely to occur when the soft portion 20 is molded. Therefore, the width is preferably set to 0.1 mm or more. It is also possible to form over the entire circumference of the tapered base material portion 11b. If the thicknesses of both the connecting portions 25 and 26 are too thin, it is easy to cause poor filling of the elastomer material when the soft portion 20 is molded. , 0.1 mm to 0.5 mm is preferable.

  However, the insertion restricting portion 22, the anti-slip portions 23 and 24, and the connecting portions 25 and 26 can be formed in an arbitrary shape in consideration of design and the like. Further, the insertion restricting portion 22 is omitted, the second connecting portion 26 is directly connected to the cleaning soft portion 21, the first anti-slip portion 23 and the first connecting portion 25 are omitted, the insertion restricting portion It is possible to omit both the anti-slip portions 23 and 24 and the both connecting portions 25 and 26 while leaving only 22.

  Examples of the elastomer constituting the soft portion 20 include thermoplastic elastomers such as styrene, olefin, and polyamide, nylon elastomers such as 6 nylon, 6-6 nylon, 6-10 nylon, and 6-12 nylon, and silicon. Thermosetting elastomers such as rubber, urethane rubber, fluoro rubber, natural rubber, and synthetic rubber can be used. In particular, a material having compatibility with the synthetic resin material constituting the base portion 10 is preferable. For example, when the base portion 10 is made of polypropylene, the soft portion 20 is made of a polyolefin-based elastomer or a styrene-based elastomer. It is preferable.

  In this interdental cleaning tool 1, a cleaning soft part 21 made of an elastomer is coated on a synthetic resin core part 12, and the cleaning part 2 inserted between the core part 12 and the cleaning soft part 21 is inserted between the teeth. Therefore, the interdental cleaning tool 1 can be softly applied to the interdental or gingival during interdental cleaning, and the feeling of use of the interdental cleaning tool 1 can be improved. Moreover, the outer peripheral surface of the core portion 12 is a tapered surface that decreases in diameter toward the tip end side of the core portion 12, and the angle θ formed by the taper surface with respect to the center line of the core portion 12 is the tip end of the core portion 12. Since it is configured with a tapered surface set so as to decrease continuously or stepwise as it goes to the side, the strength and rigidity of the core portion 12 is sufficiently secured, and the cleaning portion 2 can be bent during interdental cleaning. While preventing, the front-end | tip side of the core part 12 is comprised in a small diameter, and the length of the cleaning part 2 which can be inserted between teeth can fully be ensured. For this reason, also in the interdental cleaning tool 1 of ISO size 1 or ISO size 2, it is possible to sufficiently secure the length of the cleaning part 2 that can be inserted between teeth while sufficiently securing the strength and rigidity of the cleaning part 2. The interdental cleaning tool 1 that can withstand practical use can be realized.

  In addition, it is also possible to employ configurations other than those described above in consideration of the operability and design of the interdental cleaning tool 1 for the configuration other than the cleaning unit 2 in the interdental cleaning tool 1.

  Next, an example of the manufacturing method of the interdental cleaning tool 1 is demonstrated. However, the manufacturing method of the interdental cleaning tool 1 is not limited to this.

  As shown in FIGS. 6 and 7, the manufacturing method of the interdental cleaning tool 1 is a base for manufacturing the base material portion 10 by filling the first molding space 32 of the first molds 30 and 31 with a synthetic resin material. After the base material part 10 formed by the material part 10 molding step and the first molds 30 and 31 is set in the second molding space 42 of the second molds 40 and 41, the elastomer material is placed in the second molding space 42. And a soft part 20 forming step of forming the soft part 20 by filling the material.

(Base part molding process)
In the base material part 10 molding step, the base material part 10 is manufactured by filling the first molding space 32 of the first molds 30 and 31 with a synthetic resin material. More specifically, as the first molds 30 and 31, a plurality of first molding spaces 32 are formed in parallel, and a runner 33 is formed on the base end side of the plurality of first molding spaces 32, and the gate The plurality of first molding spaces 32 communicated with the runner 33 through the 34 and the synthetic resin material is supplied to the runner 33 so that the plurality of first molding spaces 32 are filled with the synthetic resin material through the gate 34. The plurality of base material portions 10 are formed at the same time. Then, a primary molded product 10 </ b> A having a plurality of base material portions 10, runner portions 35, and gate portions 36 is manufactured. In addition, although the base material part 10 can also be shape | molded one by one, while shape | molding the several base material part 10 simultaneously, productivity can be improved and the shape | molded runner part 35 is hold | maintained. It is preferable because a plurality of substrate parts 10 can be transferred simultaneously and workability can be improved.

(Soft part molding process)
In the soft part 20 molding step, the base material part 10 molded by the first molds 30 and 31 is set in the second molding space 42 of the second molds 40 and 41, and then the elastomer material is placed in the second molding space 42. The soft part 20 is molded by filling

  First, the second molds 40 and 41 will be described. The second molds 40 and 41 are positioned at positions corresponding to the plurality of base material portions 10 of the primary molded product 10A formed by the first molds 30 and 31. A plurality of second molding spaces 42 are formed, and a fitting space 43 that fits the runner portion 35 and the plurality of gate portions 36 of the primary molded product 10A is formed. As the second molding space 42 between the second molds 40 and 41 and the base material portion 10, a rectangular tube-shaped first anti-slip portion molding space 44 surrounding the handle base material body 11 a and the taper base material portion 11 b are provided. A rectangular tube-shaped second anti-slip portion forming space 45 surrounding the portion, a first connecting portion forming space 46 along the ridge 13 on the base side of the tapered base material portion 11b, and the tip end side of the tapered base material portion 11b The second connecting portion forming space 47 as a supply path along the ridge 13, the insertion restricting portion forming space 48 surrounding the base portion of the core portion 12, and the cleaning portion forming space 49 surrounding the core portion 12 are communicated with each other. Is formed. One second mold 40 is formed with an injection gate 50 (see FIGS. 1 and 7) that opens into the second anti-slip portion molding space 45 of each second molding space 42. The elastomer material is connected to a common runner 51 formed in the two molds 40, and an elastomer material is supplied from the common runner 51 to the plurality of second molding spaces 42 through the plurality of injection gates 50. The second anti-slip portion forming space 44 and the insertion restricting portion forming space 48 correspond to a storage space.

  The diameter of the injection gate 50 is preferably set to 0.1 mm or more and 1.0 mm or less in order to prevent poor filling of the elastomer material. Further, the injection gate 50 can be opened in the insertion restricting portion forming space 48 or the first non-slip portion forming space 44 instead of the second antislip portion forming space 45. Further, the injection gate 50 can be opened in the middle of the first connecting portion forming space 46 or the second connecting portion forming space 47. In this case, the insertion restricting portion forming space 48 or the first anti-slip portion is provided. It is preferable to open the molding space 44 or the second anti-slip portion molding space 45 within a range of 5 mm.

  The first connecting portion forming space 46 and the second connecting portion forming space 47 can be set to the same thickness. However, in order to improve the filling failure of the elastomer material in the cleaning portion forming space 49 as much as possible, the first connecting portion forming space 46 and the second connecting portion forming space 47 are viewed from the injection gate 50. The thickness of the second connecting portion forming space 47 arranged on the cleaning portion forming space 49 side is the thickness of the first connecting portion forming space 46 arranged on the base end side of the handle portion 311 when viewed from the injection gate 50. It is preferable to set it thicker. Specifically, it is preferable to give a difference of 0.1 mm or more between both thicknesses.

  In the soft part 20 molding step, the elastomer material is supplied to the injection gates 50 of the plurality of second molding spaces 42 through the common runner 51, and the first anti-slip part molding space 45 passes through the first connecting part molding space 46 to the first. The non-slip portion molding space 44 is filled with an elastomer material, and the second non-slip portion molding space 45 is filled with the elastomer material into the cleaning portion molding space 49 via the second connecting portion molding space 47 and the insertion restricting portion molding space 48. . At this time, since the second anti-slip portion forming space 45 is formed in an annular shape so as to surround the middle portion of the tapered base material portion 11b, the elastomer material supplied from the injection gate 50 is the entire second anti-slip portion forming space 45. It is stored temporarily. For this reason, poor filling of the elastomer material into the second anti-slip portion forming space 45 is reliably prevented. Further, the elastomer material stored in the second anti-slip portion forming space 45 is supplied to both the first connecting portion forming spaces 46 by substantially the same amount at substantially the same timing, and both the second connecting portion forming spaces 47. Also, approximately the same amount is supplied at substantially the same timing. For this reason, since the elastomer material can be supplied from the two first connecting portion molding spaces 46 to the first anti-slip space 44 at substantially the same timing by substantially the same amount, poor filling of the elastomer material into the first anti-slip space 44 is also caused. Effectively prevented. Further, the elastomer material is supplied from the second anti-slip portion forming space 45 through the second connecting portion forming space 47 to the cleaning portion forming space 49 at substantially the same timing and in substantially the same amount, and the annular insertion space 47 is inserted. Since it is further temporarily stored in the restricting portion forming space 48 and then supplied to the entire circumference of the base of the cleaning portion forming space 49 at substantially the same timing and without any variation over the entire circumference, the elastomer material reaches the tip of the cleaning portion forming space 49. Can be filled without difficulty, and defective filling of the elastomer material in the cleaning portion forming space 49 is prevented. In addition, since the base portion of the core portion 12 disposed in the cleaning portion molding space 49 has a larger cross-sectional area than the tip portion side and is not easily softened by the heat of the elastomer material, the core portion 12 is increased while increasing the filling pressure of the elastomer material. This also prevents the defective filling of the elastomer material in the cleaning portion forming space 49. In addition, since the elastomer material is filled from the base side of the core part 12, the tip side part of the core part 12 can be configured to have a small diameter, and the length of the cleaning part 2 that can be inserted between teeth can be set as long as possible. .

  Thus, after covering the base part 10 with the soft part 20, the runner part 35 and the gate part 36 are removed, and the interdental cleaning tool 1 is obtained.

  In addition, the 1st connection part shaping | molding space 46 and the 1st anti-slip | skid part shaping | molding space 44 are omissible. Further, the insertion restricting portion forming space 48 can be omitted, and the first connecting portion forming space 46 can be directly communicated with the cleaning portion forming space 49. Further, it is possible to omit the first and second connecting portion forming spaces 46 and 47 and the first and second anti-slip portion forming spaces 44 and 45 and to open the injection gate 50 into the insertion restricting portion forming space 48. is there.

  Moreover, in this Embodiment, although the manufacturing method comprised so that an elastomer might be filled into the cleaning part shaping | molding space from the base side of the core part 12 as a manufacturing method of the interdental cleaning tool 1, the front-end | tip of the core part 12 was used. It is also possible to employ a manufacturing method configured to fill the cleaning portion molding space with the elastomer from the side.

<Evaluation test>
Next, an evaluation test of the interdental cleaning tool will be described.
As the interdental cleaning tool of Examples A to C, the diameter and cross-sectional area of the core 12 at a position 5 mm from the tip of the core 12, and the core 12 at a position of 10 mm from the tip of the core 12. The base material part 10 made of polybutylene terephthalate (PBT) is manufactured so that the diameter and the cross-sectional area are the values shown in Table 1, and the cleaning part 2 at a position 5 mm from the tip part of the cleaning part 2 (however, The diameter and cross-sectional area of the cleaning part 2 and the diameter and cross-sectional area of the cleaning part 2 (except for the protrusion) at a position 10 mm from the tip of the cleaning part 2 are the values shown in Table 1. In addition, an interdental cleaning tool formed by molding the soft portion 20 made of polystyrene elastomer on the base material portion 10 was manufactured. As a comparative example, the diameter and cross-sectional area of the core at a position 5 mm from the tip of the core and the diameter and cross-sectional area of the core at a position of 10 mm from the tip of the core are shown in Table 1. A base material part made of polypropylene is manufactured so as to be the value shown, and the diameter and cross-sectional area of the cleaning part (excluding protrusions) at a position 5 mm from the tip part of the cleaning part, and the tip part of the cleaning part A soft part made of a polystyrene-based elastomer is molded on the base part so that the diameter and cross-sectional area of the cleaning part (excluding protrusions) at the position of 10 mm have the values shown in Table 1. An interdental cleaning tool was produced.

  And in order to evaluate the insertability of the cleaning part 2 with respect to between teeth, the size of the cleaning part 2 is measured according to ISO16409, and the ISO size 1 that can pass through a hole having a diameter of 0.7 mm to 0.8 mm, and the diameter The applicable length from the tip of ISO size 2 that can pass through a hole of 0.9 mm to 1.0 mm was measured. The results are shown in Table 2.

  Moreover, in order to evaluate the cleaning property between teeth, the interdental cleaning tool of Examples A, B, and C, the interdental cleaning tool of Comparative Example, and an ISO size 1 interdental brush using a nylon filament were used. Then, each of the following cleaning property evaluation tests was performed three times.

  In the evaluation test, a jaw model (manufactured by Nissin Co., Ltd.) was used and, as shown in FIG. 8, occluded (manufactured by Pascal Company Inc) as a pseudo plaque between the first molar M1 and the second molar M2 of the jaw model. Was applied and cleaned between the first molar M1 and the second molar M2 only once. Then, a photograph of the vicinity of the neck portions m1 and m2 of the first molar M1 and the second molar M2 with the first molar M1 and the second molar M2 removed is taken, and the neck portions m1 and m2 are photographed. The dirt removal rate in the specific area A was calculated by image analysis, and the average value was obtained. The results are shown in Table 3. As shown in FIG. 8, the specific area A includes a center point CT1 in the front-rear direction of the cervical portion m1 of the lower left first molar M1 and a cervical portion m2 of the lower left second molar M2. Center point CT2 in the front-rear direction on the lingual side of the tooth, center point CC1 in the front-rear direction of the buccal side of the neck portion m1 of the first molar M1, and the front-back direction in the buccal side of the neck portion m2 of the second molar M2 In the quadrangle having the center CC2 as the apex, a central area of 40% in the width direction (left-right direction) and 70% in the thickness direction (front-back direction) was set as the specific area A.

  From Table 2, the interdental cleaning tools of Examples A, B, and C are adapted to ISO size 2 within a range of 10 mm or more from the tip of the cleaning unit, and the interdental of ISO size 2 having sufficient cleaning properties It can be seen that a cleaning tool can be realized. Further, in the interdental cleaning tool of Example A, ISO size 1 is also applied within a range of 7 mm from the tip of the cleaning portion, and an ISO size 1 interdental cleaning tool having sufficient cleaning performance can be realized. I understand.

  Moreover, it can be seen from Table 3 that the interdental cleaning tools of Examples A, B, and C can obtain the same level of cleaning effect as an ISO size 1 interdental brush using a filament.

  The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and it goes without saying that the configuration can be changed without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Interdental cleaning tool 2 Cleaning part 2a Cleaning side taper surface 3 Handle part 10 Base material part 10A Primary molded article 11 Handle base material 11a Handle base material main body 11b Tapered base material part 12 Core part 12a Core side taper surface 13 Projection 14 Annular recess 15 Through hole 20 Soft part 21 Cleaning soft part 21a Covering part 21b Projection part 22 Insertion restricting part 23 First anti-slip part 24 Second anti-slip part 25 First connecting part 26 Second connecting part 30 First mold 31 First mold 32 First molding space 33 Runner 34 Gate 35 Runner part 36 Gate part 40 Second mold 41 Second mold 42 Second molding space 43 Fitting space 44 First anti-slip part molding space 45 Second Non-slip portion forming space 46 First connecting portion forming space 47 Second connecting portion forming space 48 Insertion restricting portion forming space 49 Cleaning portion forming space 50 Injection gate 51 Runner

The present invention includes the following inventions.
(1) In an interdental cleaning tool in which a cleaning soft part made of an elastomer is coated on a synthetic resin core part, and a cleaning part inserted between teeth is formed by the core part and the cleaning soft part. The core portion is configured with a core-side tapered surface that is reduced in diameter as it goes to the distal end side, and the cleaning portion is configured with a cleaning-side tapered surface that is reduced in diameter as it goes toward the distal end side, and the center line of the core portion The interdental cleaning tool is characterized in that the angle between the two taper surfaces is set to decrease continuously or stepwise as it goes to the tip side of the core.

(2) In the interdental cleaning tool according to (1), the cross-sectional area at a position 5 mm from the tip of the cleaning unit is set to 0.4 to 0.6 mm ² and 10 mm from the tip of the cleaning unit. It is a preferred embodiment to set the cross-sectional area at the position to 0.75 to 1.00 mm ² . By comprising in this way, the interdental cleaning tool of ISO size 1 or ISO size 2 which can fully ensure the length of the cleaning part which can be inserted between teeth is realizable.

(3) In the interdental cleaning tool according to (1) or (2), two types of tapered surfaces having different angles with respect to a center line of the core or a change rate of the angle are formed as the cleaning-side tapered surface. Can do .
(4) In the interdental cleaning tool according to (1) or (2) , the base end side of the intersecting line segment between the cleaning- side tapered surface and the cross section including the center line of the core portion is along the first arc. The tip side can be formed along a second arc having a diameter larger than that of the first arc. By comprising in this way, the interdental cleaning tool of ISO size 1 or ISO size 2 which can fully ensure the length of the cleaning part which can be inserted between teeth is realizable.

(5) In the interdental cleaning tool according to (1), (2) or (4), it is preferable that the thickness of the cleaning soft part is set substantially the same over the entire length of the cleaning part. In this case, it is possible to improve the moldability of the cleaning soft part by the elastomer material.

(6) In the interdental cleaning tool according to any one of (1) to (5), it is a preferred embodiment that the core portion is configured in a linear and elongated shaft shape.
(7) In the interdental cleaning tool according to any one of (1) to (6), the distal end portion of the core portion is formed in a partial spherical shape, and the cross-sectional area of the proximal end portion is 0.15 mm ² or more. It is a preferred embodiment to set to. By configuring in this way, the strength and rigidity of the tip of the cleaning unit is increased, and the back side between the teeth opposite to the insertion side of the cleaning unit is also effective by the tip of the cleaning unit pierced between the teeth. It becomes possible to clean.

(8) In the interdental cleaning tool according to any one of (1) to (7), an annular insertion made of an elastomer that regulates an insertion limit position of the cleaning unit with respect to the interdental region at a proximal end portion of the cleaning unit. It is also a preferred embodiment that the restricting portion is formed so as to protrude outwardly on the outer peripheral surface of the base portion of the core portion in a manner that continues to the base end portion of the cleaning soft portion. In this case, the insertion restricting portion can restrict the maximum insertion length of the cleaning portion with respect to the gap between teeth, and avoids a load on the core due to excessive insertion, thereby preventing shaft breakage and inserting the restricting portion into the gingiva. By bringing it into contact with the gingiva, a massage effect on the gums can be expected. Further, when forming the interdental cleaning tool, once the elastomer material is temporarily stored in the insertion restricting portion forming space for forming the insertion restricting portion, the entire portion of the elastomer is formed on the base of the cleaning portion forming space for forming the cleaning soft portion. Since the elastomer material can be supplied so as to be uniform, molding defects of the cleaning soft portion can be effectively prevented.

(9) In the interdental cleaning tool according to any one of (1) to (8), a handle base made of a synthetic resin is provided as a handle, and the core portion is connected to a tip portion of the handle base. This is a preferred embodiment .
(10) In the interdental cleaning tool according to (9), an annular non-slip portion made of an elastomer is formed on an outer peripheral portion of the handle base material in the length direction, and the anti-slip portion is formed on the handle base material. It is a preferred embodiment to provide a connecting portion made of an elastomer that connects the cleaning soft portion. If comprised in this way, since the slip of an interdental cleaning tool can be prevented by a slip prevention part, the handleability of an interdental cleaning tool can be improved. Also, when forming the interdental cleaning tool, the elastomer material is temporarily stored in the anti-slip part forming space for forming the anti-slip part, and from this anti-slip forming space, through a plurality of supply paths for forming the connecting part, for cleaning. Since the elastomer material can be supplied to the base portion of the cleaning portion forming space for forming the soft portion so as to be uniform over the entire circumference, it is possible to effectively prevent molding defects in the soft portion for cleaning.

(11) In the interdental cleaning tool according to (10), the handle base material is formed in an elongated flat bar shape, and the connection portion is made to correspond to the center part in the width direction of both wide surfaces of the handle base material, Forming along the length direction of the handle substrate is also a preferred embodiment. In this case, when using the interdental cleaning tool, it is easy to hold the interdental cleaning tool and the wide width of the handle base material because the thumb and index finger can be used to clean the handle base. Since the connecting portion made of an elastomer is formed on the connecting portion, not only the anti-slip portion but also the connecting portion can prevent the held finger from slipping, and the handling performance of the interdental cleaning tool can be improved.
(12) In the interdental cleaning tool according to any one of (9) to (11), the handle base material includes a handle base material body and a tapered base material provided continuously to a tip portion of the handle base material body. The tapered base material portion is curved in the width direction of the handle base material body, and is tapered in the width direction and the thickness direction so as to become narrower and thinner as it goes to the tip side. It is a preferred embodiment that it is formed.

(13) In the interdental cleaning tool according to any one of (9) to (12), it is a preferred embodiment that a concave portion or a through hole for reducing a synthetic resin material is formed in the handle base material. By constructing in this way, the material used for the base material can be saved, and the production cost of the interdental cleaning tool can be reduced, and the design of the interdental cleaning tool can be improved by using the recesses and through holes. When the interdental cleaning tool is accommodated in the packaging blister container or the like, the interdental cleaning tool can be fixed to the blister container, which is preferable.

(14) In the interdental cleaning tool according to any one of (1) to (13), the cleaning soft portion includes a covering portion that covers the core portion, and an interval in the length direction of the covering portion. It is a preferred embodiment to have a plurality of protrusions that are open and project outward.

(15) In the interdental cleaning tool according to any one of (1) to (14), the synthetic resin material constituting the core portion and the elastomer material constituting the cleaning soft portion are compatible. A preferred embodiment is made of a material. In this case, since it can prevent effectively that the soft part for cleaning peels from a core part , the interdental cleaning tool excellent in durability is realizable.

Claims (15)

In the interdental cleaning tool in which the soft part for cleaning made of elastomer is coated on the synthetic resin core part, and the cleaning part inserted between the teeth is formed by the core part and the soft cleaning part,
Consists of a core side taper surface that reduces the diameter as it goes to the tip side,
The cleaning part is composed of a cleaning side taper surface that decreases in diameter as it goes to the tip side,
The angle formed by the two tapered surfaces with respect to the center line of the core portion was set to decrease continuously or stepwise as going to the tip side of the core portion,
An interdental cleaning tool characterized by that. Set the cross-sectional area in the 0.4 to 0.6 mm ² at the position of 5mm from the tip of the cleaning unit, setting the cross-sectional area at the position of 10mm from the tip of the cleaning portion 0.75～1.00Mm ² The interdental cleaning tool according to claim 1.   The interdental cleaning tool according to claim 1 or 2, wherein two types of tapered surfaces having different angles with respect to a center line of the core portion or different rates of change are formed as the cleaning-side tapered surfaces.   The base end side of the intersection line between the cleaning-side tapered surface and the cross section including the center line of the core portion is formed to have a shape along the first arc, and the tip end side has a larger diameter than the first arc. The interdental cleaning tool of Claim 1 or 2 formed so that it might become a shape along the 2nd circular arc.   The interdental cleaning tool of any one of Claims 1-4 which set the thickness of the said soft part for a cleaning substantially the same over the full length of the cleaning part.   The interdental cleaning tool according to any one of claims 1 to 5, wherein the core portion is formed in a linear elongated shaft shape. The interdental cleaning tool according to any one of claims 1 to 6, wherein a tip end portion of the core member is formed in a partial spherical shape, and a cross-sectional area of the base end portion is set to 0.15 mm ² or more.   An annular insertion restricting portion made of an elastomer for restricting the insertion limit position of the cleaning portion with respect to the gap between teeth is connected to the base end portion of the cleaning soft portion at the base end portion of the cleaning portion, and the outer periphery of the base portion of the core portion The interdental cleaning tool according to any one of claims 1 to 7, wherein the interdental cleaning tool is formed on the surface so as to protrude outward.   The interdental cleaning tool of any one of Claims 1-8 which provided the handle base material made from synthetic resin as a handle, and provided the said core part continuously with the front-end | tip part of the said handle base material.   An annular non-slip portion made of an elastomer is formed on an outer peripheral portion in the middle of the handle base material in the length direction, and a connecting portion made of an elastomer for connecting the anti-slip portion and the soft cleaning portion to the handle base material is formed. The interdental cleaning tool according to claim 9 provided.   The handle base material is formed in an elongated flat bar shape, and the connection portion is formed along the length direction of the handle base material so as to correspond to the center part in the width direction of both wide surfaces of the handle base material. The interdental cleaning tool according to 10.   The handle base material has a handle base material main body and a tapered base material portion continuously provided at a tip portion of the handle base material main body, and the tapered base material portion is curved in the width direction of the handle base material main body. The interdental cleaning tool according to any one of claims 9 to 11, wherein the interdental cleaning tool is formed in a tapered shape in the width direction and the thickness direction so as to become narrower and thinner as it goes to the distal end side.   The interdental cleaning tool of any one of Claims 9-12 which formed the recessed part or through-hole for synthetic resin material saving in the said handle base material.   The soft part for cleaning has a covering part which covers the core part, and a plurality of projection parts which formed in the covering part at intervals in the length direction so as to protrude outward. The interdental cleaning tool of any one of Claims.   The interdental cleaning tool of any one of Claims 1-14 which the synthetic resin material which comprises the said core part, and the elastomer material which comprises the said soft part for cleaning consist of compatible materials.

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