JP2004089471A - Toothbrush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a toothbrush for fully exhibiting an effect of removing dental plaque in an interdental part while allowing efficient brushing of the interdental part by adjusting the arrangement of bristles different in bristling height and the tilt angles of the bristles. <P>SOLUTION: This toothbrush 10 is formed by inserting a plurality of bristle bunches 15a, 15b, 15c formed by bunching a plurality of bristles 14a, 14b, 14c, in a bristling base 11. A bristling surface of the bristle base 11 is partitioned into a center strip region 16 and a pair of outer regions 17 on both sides. In the case main bristles with the tips positioned on the center strip region 16 are made as center main bristles, and main bristles positioned on the outer regions 17 are made as outer main bristles, the average bristling height of the center main bristles is higher than the average bristling height of the outer main bristles. Further, a part or the whole of the main bristles is tilted, and the average of the tilt angles of the all main bristles to a vertical direction is 2.5-15°. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a toothbrush in which a plurality of bristle bundles obtained by bundling a plurality of bristles are planted on a flocking table.
[0002]
Problems to be solved by the prior art and the invention
A toothbrush is formed by implanting and fixing a hair bundle formed by bundling a plurality of bristles by a method of driving a flat wire into a plurality of flocking holes formed in a flocking table or fusing with heat. It is. In addition, the toothbrush arranges the bristle bundles and the bristle so that plaque and the like can be effectively removed by efficiently performing appropriate brushing according to the tooth part such as the interdental part, the tooth surface part, the cervical part and the like. Various modifications have been made to the shape of the hair tips.
[0003]
On the other hand, as a toothbrush that can efficiently brush the interdental portion, for example, a toothbrush that has different bristle implantation heights so that the bristle tips of long bristle can easily enter the interdental portion can be considered. Even if the bristle implantation height is made different in the axial direction of the toothbrush, if the bristle height is the same in the direction perpendicular to the axial direction of the toothbrush, the bristle tip in the central part area is interdental. The bristle in the outer part area is impeded by the bristle even if it tries to penetrate, and the bristle escapes outside even if the bristle tip of the outer part area tries to penetrate into the interdental part, and plaque in the interdental part is efficiently Could not be removed.
[0004]
Also, with a toothbrush that only has a convex step in the direction perpendicular to the axial direction of the toothbrush, a bristle with a long bristle in the center area becomes slightly easier to enter the interdental area, but if the step is small, The outer region has high rigidity and is supported by short bristle bristle, so it is impossible to reach deep into the interdental area.If the step is large, the bristle with long bristle in the central region will escape to the outside or weaken Therefore, in any case, the effect of removing plaque in the interdental region cannot always be sufficiently exhibited.
[0005]
ADVANTAGE OF THE INVENTION By adjusting the arrangement | positioning of the bristle with which a bristle height differs, and the inclination angle of a bristle, this invention enables efficient brushing of the interdental part by the bristle which was transplanted, and the plaque of the interdental part is reduced. An object of the present invention is to provide a toothbrush capable of sufficiently exhibiting a removing effect.
[0006]
[Means for Solving the Problems]
The present invention is a toothbrush in which a plurality of bristle bundles obtained by bundling a plurality of bristles are planted on a flocking table, wherein the tips of the plurality of bristles planted on the flocking table are brought into contact with a flat surface. The main bristle, which is a bristle whose tip comes into contact with the flat surface when brushing while applying a load of 300 g vertically from the rear side of the flocking table and contacting the flat surface, is used to move the flocking surface of the flocking table to the axis of the toothbrush. The main bristle whose front end is located on the central band-shaped region is located on the central main bristle and the outer region is divided into a central band-shaped region having a width of 3 mm parallel to the direction and a pair of outer regions on both sides thereof. When the main bristles to be used are the outer main bristles, the average flocking height of the central main bristle is higher than the average bristle height of the outer main bristle in each of the outer regions. Further, all or a part of the main bristles are tilted, and the average of the tilt angles of all the main bristles with respect to the vertical direction is 2.5 to 15 degrees. Here, the inclination direction of the main bristles with respect to the vertical direction is not particularly limited, and the average of the inclination angles means the average of the absolute values of the inclination angles with respect to the vertical direction.
[0007]
Further, in the toothbrush of the present invention, it is preferable that the average bristle implantation height of the central main bristle is 0.1 to 4.0 mm higher than the average bristle implantation height of the outer main bristle in each of the outer regions.
[0008]
Here, in the present application, the “main bristles” are formed by setting the tips of a plurality of bristles 51 planted on the flocking table 50 to the flat surface 52 as shown in FIGS. 4A and 4B by modeling. When the brush flocking table 50 is brushed from the rear side of the flocking table 50 while vertically applying a load P of 300 g from the rear side thereof, it means the bristle 51 a whose tip contacts the flat surface 52, and the load P of 300 g is Except for the bristle 51b in which the tip of the longest bristle 51a does not abut on the flat surface 52 even when the flocking table 50 moves vertically by the displacement s due to the vertical load, and the bristle 51 has a bristle height difference d larger than the displacement s. The purpose is to think.
[0009]
In the present application, the central main bristle is a main bristle that is implanted in a central band-shaped region having a width of 3 mm parallel to the axial direction of the toothbrush and whose tip is located above the central band-shaped region. When the plant is straddled over the dividing line between the band-shaped region and the outer region, the main bristle arranged on the side of the central band-shaped region divided by the dividing line is set as the central main bristle and arranged on the outer region side. The main bristle thus set is the outer main bristle.
[0010]
The reason why the width of the central band-shaped region is set to 3 mm is the difference in average flocking height between the central main bristle in the central band-shaped region and the outer main bristle in each outer region, based on a model test for plaque removal rate described later. As a result of examining the parameter for the plaque removal rate while changing the width of the central band-shaped area under the condition of unifying the inner and outer steps of the convex shape, the change of the plaque removal rate by setting the width of the central band-shaped area to 3 mm. Is particularly prominent.
[0011]
And according to the toothbrush of this invention, since the average bristle height of the central main bristle is higher than the average bristle height of the outer main bristle in each outer area, the central main bristle having a longer bristle length than the outer main bristle. The bristle tips easily and smoothly enter into the interdental portions during brushing. Also, since the average of the inclination angles of all the main bristles irrespective of the inclination direction is 2.5 to 15 degrees, the buckling strength of the toothbrush with respect to the vertical load is lower than when the bristles are not inclined. The whole is pressed deeper to allow the tip of the hair to reach the deep part of the interdental area. Therefore, it is possible to sufficiently exert the effect of removing plaque in the interdental region by these synergistic effects.
[0012]
Further, the average of the inclination angles of all the main bristles with respect to the vertical direction irrespective of the inclination direction is set to 2.5 to 15 degrees because the average of the inclination angles is changed by a model test of the plaque removal rate described later. As a result of evaluating the plaque removal rate, when the average tilt angle is in the range of 2.5 to 15 degrees, the plaque removal rate is significantly higher than that of a toothbrush having an average tilt angle of 0 degrees. It is. If the average of the tilt angles exceeds 15 degrees, the buckling strength of the toothbrush is too weak, and the hair is in a crushed state. The removal rate will rather decrease.
[0013]
As a method of lowering the buckling strength of the toothbrush, besides a method of inclining the bristles, a method of reducing the rigidity by making the bristles thinner or longer, or reducing the elastic modulus of the material can be considered. When the bristle tips reach the space, the power to scrape plaque is reduced by the method of weakening the rigidity, but according to the method of tilting the bristle of the present invention, the force to scrape plaque is maintained. Becomes possible.
[0014]
According to the present invention, the plaque removing effect is achieved by making the average bristle height of the central bristle 0.1 to 4.0 mm higher than the average bristle height of the outer bristle in each of the outer regions. It is possible to efficiently secure a level difference sufficient to improve the height. If the convex inner / outer step is larger than 4.0 mm, the outer bristles become too short, so that it is difficult to prevent the inner bristles from protruding to the outside, and the plaque removing effect may be rather reduced.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
The toothbrush 10 according to the first preferred embodiment of the present invention shown in FIG. 1 has a plurality of flocked portions 11 formed on a toothbrush body 11 of a toothbrush main body including a grip portion (not shown), a flocked portion 11 and a neck portion 12 connecting these. A hair bundle (tuft) 15a, 15b, 15c formed by bundling a plurality of bristles 14a, 14b, 14c is planted (planted) in the flocking hole 13, respectively.
[0016]
According to the toothbrush 10 of the first embodiment, the toothbrush main body is a known one made of a synthetic resin such as, for example, polypropylene or ABS resin, and the flat flocking surface of the flocking table 11 has a diameter of 1.2 mm. The flocking holes 13 having a circular cross section are distributed and arranged at 32 places in the vertical and horizontal directions over substantially the entire area of the flocking surface. In these flocking holes 13, the first bristle bundles 15 a schematically indicated by white circles in FIG. 1 are provided at six places, the second bristle bundles 15 b schematically illustrated by black circles are provided at four places, and the third hair bundles 15 b schematically illustrated by double circles in FIG. Hair bundles 15c are implanted at 22 locations, respectively.
[0017]
The bristles 14a, 14b, 14c constituting each of the hair bundles 15a, 15b, 15c are made of a synthetic resin such as nylon, and have a thickness of, for example, 6 to 10 mils. Each hair bundle 15a, 15b, 15c is formed by bundling several tens.
[0018]
According to the first embodiment, the flocking surface of the flocking table 11 is divided into a central band-like region 16 having a width of 3 mm and a pair of outer regions 17 on both sides of the central band-like region 16 by a pair of partition lines 18 parallel to the axial direction X of the toothbrush 10. At the time of division, six first bristle bundles 15a and four second bristle bundles 15b are implanted in the central band-like region 16, and eleven third bristle bundles 15c are respectively arranged in the outer regions 17. Will be planted. According to the first embodiment, the first hair bundle 15a and the second hair bundle 15b are located at the peripheral edges of the first hair bundle 15a and the second hair bundle 15b arranged adjacent to the division line 18 between the central band-shaped region 16 and the outer region 17. A part of the bristles 14a and 14b protrude toward the outer region 17 and are planted.
[0019]
According to the first embodiment, the first bristle bundle 15a is configured by bundling 16 first bristles 14a having a thickness of 9 mil (0.229 mm). The first bristle bundle 15a is implanted at an angle of 10 degrees (+10 degrees) with respect to the vertical direction toward the tip end side (front) of the toothbrush 10 in the axial direction X, and each first bristle 14a is Hair is planted with a hair length of 11.0 mm from the planted surface. The second hair bundle 15b is configured by bundling 12 second bristles 14b each having a thickness of 10 mil (0.254 mm). The second bristle bundles 15b are implanted at an angle of 10 degrees (+10 degrees) with respect to the vertical direction toward the tip side of the toothbrush 10 in the axial direction X, and each second bristle 14b is separated from the flocked surface. Hair is planted with a hair length of 11.0 mm.
[0020]
Further, the third hair bundle 15c is configured by bundling 34 third bristles 14c each having a thickness of 6 mil (0.152 mm). The third bristle bundle 15c is implanted at an angle of 5 degrees (-5 degrees) with respect to the vertical direction toward the rear end side (rear) of the toothbrush 10 in the axial direction X, and each third bristle. 14c is implanted with a hair length of 10.0 mm from the implanted surface. According to the first embodiment, the case (+) in which the toothbrush 10 is tilted from the direction perpendicular to the flocking surface of the flocking table 11 toward the tip side (forward) in the axial direction X of the toothbrush 10 (+), The case of tilting to the rear end side (rearward) is defined as (-).
[0021]
Thus, according to the toothbrush 10 of the first embodiment, the central bristle is implanted in the central band-shaped region 16 and its tip is formed by the first bristle 14a and the second bristle 14b located above the central band-shaped region 16. The average flocking height is approximately 1.0 mm higher than the average bristle height of the outer bristle formed by the third bristle 14c or the like located at the top of the outer region 17 at the tip of each of the outer regions 17.
[0022]
Further, according to the toothbrush 10 of the first embodiment, when the brush is brushed while applying a load of 300 g vertically, the flocking table 11 is displaced to, for example, about 1.8 mm flocking side. The outer bristle 14c, which is 1.0 mm shorter than the bristles 14a and 14b, contacts the flat surface. Therefore, all of the bristles 14a, 14b, 14c, and 14d constituting each of the hair bundles 15a, 15b, 15c, and 15d have the tips of the plurality of bristles planted on the flocking table 11 in contact with a flat surface. The main bristle, which is a bristle whose tip comes into contact with a flat surface when brushing while applying a load of 300 g vertically from the rear side of the flocking table 11, is constituted.
[0023]
Furthermore, according to the toothbrush 10 of the first embodiment, all of the six first bristle bundles 15a and four of the second bristle bundles 15b implanted in the central band-like region 16 are at 10 degrees with respect to the vertical direction. All of the 22 third bristle bundles 15c, which are implanted at an angle in the direction of the tip of the toothbrush 10 in the axial direction X and implanted in the outer region 17, are at an angle of 5 degrees with respect to the vertical direction. By tilting and implanting at the rear end side of the ten axial directions X, the average of the tilt angles of all the main bristles 14a, 14b, 14c, 14d in the vertical direction independent of the tilt direction is 6.6 degrees. Will be.
[0024]
According to the toothbrush 10 of the first embodiment, the arrangement of the main bristles 14a, 14b, and 14c having different flock heights and the inclination angles of the main bristles 14a, 14b, and 14c are adjusted, so that the main bristles having the bristles are adjusted. Efficient cleaning of the interproximal portion by 14a, 14b, and 14c is enabled, and the effect of removing plaque in the interproximal portion can be sufficiently exhibited.
[0025]
That is, according to the first embodiment, the average flocking height of the central main bristle in the central band-shaped region 16 is higher than the average flocking height of the outer main bristle in each outer region 17, and therefore, is higher than the outer main bristle. The bristle tips of the long central main bristle easily and smoothly enter the interdental region during brushing. In addition, since the average of the inclination angles of all the main bristles 14a, 14b, 14c, and 14d is 2.5 to 15 degrees regardless of the inclination direction, the buckling strength of the toothbrush 10 with respect to the vertical load indicates that the bristles are not inclined. As compared with the case, the toothbrush 10 is pressed more deeply so that the bristle tip can reach a deep part between the teeth. Therefore, it is possible to sufficiently exert the effect of removing plaque in the interdental region by these synergistic effects.
[0026]
FIGS. 2A and 2B show a toothbrush 20 according to a second preferred embodiment of the present invention. The toothbrush 20 according to the second embodiment includes a grip portion (not shown) and a flocking table. A bristle bundle formed by bundling a plurality of bristles 24a, 24b, 24c, 24d in a plurality of flocked holes 23a, 23b, 23c, 23d formed in a flocked base 21 of the toothbrush main body, which is composed of 21 and a neck 22 connecting these. The tufts 25a, 25b, 25c, and 25d are each planted (planted).
[0027]
Further, according to the toothbrush 20 of the second embodiment, the toothbrush body is a known one made of a synthetic resin such as, for example, polypropylene or ABS resin, similarly to the toothbrush 10 of the first embodiment. A track with a short axis of 0.8 mm parallel to the axial direction X of the toothbrush 20 and a long axis of 3.0 mm perpendicular to the flat direction on the flat flocking surface of the flocking table 21 of the toothbrush 20 over substantially the entire area thereof. Five circular first flocking holes 23a are formed in five places, and a major circular axis parallel to the axial direction X of the toothbrush 20 is 2.2 mm, and a minor circular axis perpendicular to this is 0.8 mm. It is formed at 16 locations. In addition, the track-shaped third flocking holes 23c each having a major axis of 1.5 mm and a minor axis of 0.8 mm are provided at five places, and a fourth circular track-like fourth member having a major axis of 1.5 mm and a minor axis of 0.8 mm. Flocked holes 23d are formed at seven locations.
[0028]
2A, a first bristle bundle 25a schematically illustrated by a shaded line in FIG. 2A is provided in the five first flocked holes 23a, and an axial direction X of the toothbrush 20 is provided in 16 second flocked holes 23b. Each of the second hair bundles 25b, which is schematically illustrated by drawing a rounded circle, is planted. In addition, a third hair bundle 25c, which is schematically illustrated in black, is provided in the five third flocking holes 23c, and a fourth hair bundle 25d, which is schematically illustrated in white, is in each of the fourth fourth flocking holes 23d. Hair transplanted.
[0029]
Further, according to the second embodiment, the flocking surface of the flocking table 21 is defined by a pair of partition lines 28 parallel to the axial direction X of the toothbrush 20 by a central band-like region 26 having a width of 3 mm and a pair of outer regions 27 on both sides thereof. In the central band-like region 26, five first hair bundles 25a, five third hair bundles 25c, and one fourth hair bundle 25d are planted in the central band-shaped region 26, and each outer region 27 In each case, eight second hair bundles 25b and three fourth hair bundles 25d are implanted. According to the second embodiment, the third hair bundle 25c and the fourth hair bundle 25d arranged adjacent to the dividing line 28 between the central band-shaped region 26 and the outer region 27 are partially The bristles 24c and 24d protrude toward the central band-shaped region 26 or the outer region 27 and are planted.
[0030]
Furthermore, according to the second embodiment, the flocking surface of the flocking table 21 is partitioned by the partitioning line 29 perpendicular to the axial direction X of the toothbrush 20 and divided into the leading end region 30 and the trailing end region 31 of the flocking table 21. At the time of division, the two second hair bundles 25b, five third hair bundles 25c, and seven fourth hair bundles 25d implanted in the distal end side region 30 are 5 degrees with respect to the vertical direction ( The toothbrush 20 is tilted toward the tip side (forward) in the axial direction X of the toothbrush 20 at an angle of (+5 degrees). In the rear end side area 31, the five first hair bundles 25a implanted in the central band-like area 26 are arranged at an angle of 10 degrees (+10 degrees) with respect to the vertical direction on the tip side in the axial direction X of the toothbrush 20. Each of the seven second hair bundles 25b planted in the outer region 27 is planted perpendicularly to the planted surface of the planting table 21 without being inclined. (See FIG. 2B).
[0031]
The first bristle bundle 25a is configured by bundling 38 first bristles 24a having a thickness of 9 mil (0.229 mm), and each first bristle 24a has a bristle height of 11.5 mm from the flocking surface. Have been. The second bristle bundle 25b is configured by bundling 48 second bristles 24b each having a thickness of 7 mil (0.178 mm), and each second bristle 24b has a bristle of 9.0 to 11.5 mm from the flocking surface. Hair is planted in length.
[0032]
Further, the third bristle bundle 25c is configured by bundling 15 third bristles 24c having a thickness of 9 mil (0.229 mm), and each third bristle 24c is 11.0 to 12.0 mm from the flocking surface. Hair is implanted at a hair length (11.5 mm, 12.0 mm, 11.5 mm, 11.0 mm, in order from the third bristle 24c constituting the third hair bundle 25c on the tip end side of the flocking table 21). Furthermore, the fourth bristle bundle 25d is configured by bundling 19 fourth bristles 24d having a thickness of 8 mil (0.203 mm), and each fourth bristle 24d is 10.5-11.5 mm from the flocking surface. (The hair length is 11.5 mm, 11.0 mm, and 10.5 mm in order from the fourth bristle 24d constituting the fourth hair bundle 25d on the tip side of the flocking table 21).
[0033]
Therefore, according to the second embodiment, the brush surface at the upper end of the entire hair bundle group including the five third hair bundles 25c and the seven fourth hair bundles 25d is shown in FIG. 2B. As described above, the two third hair bundles 25c (hair length 12.0 mm) in the second row from the tip end side of the flocking table 21 have the highest height, and are formed in a mountain shape when viewed from the side of the toothbrush 20. I have.
[0034]
Further, according to the second embodiment, the second hair bundle 25b has the highest hair length (11.5 mm) as shown in an enlarged top view and a side view in a portion A of FIG. 2A. ), From the eight second bristles 24b to the second bristles 24b having the lowest bristle length (9.0 mm), the bristle length of the second bristles 24b is sequentially reduced so that the tip shape becomes a concave curved shape. The hair is planted in a state in which the hair is placed. As a result, only the longer 24 second bristles 24b, which have longer hair lengths, have their tips abutting on a flat surface when brushed while applying a load of 300 g vertically from the rear side of the flocking table 21. It constitutes a bristle.
[0035]
As described above, according to the toothbrush 20 of the second embodiment, the first bristle bundles 25a at five locations are inclined at an angle of 10 degrees with respect to the vertical direction, and the second bristle bundles 25b at two locations are provided. Is tilted at an angle of 5 degrees with respect to the vertical direction, and five third hair bundles 25c and seven fourth hair bundles 25d are tilted at an angle of 5 degrees with respect to the vertical direction. Since the second bristle bundles 25b at a total of 14 places are vertically implanted without tilting, the tilting of all the main bristles 14a, 14b, 14c, 14d constituting each of the bristle bundles 25a, 25b, 25c, 25d is performed. The average tilt angle with respect to the vertical direction regardless of the direction is 6.0 degrees.
[0036]
Further, according to the second embodiment, the convex inner / outer step, which is the difference in average flocking height between the central main bristle in the central band-shaped region 26 and the outer main bristle in each outer region 27, is 0.65 mm. Since the average of the inclination angles is 6.0 degrees, the same operation and effect as those of the toothbrush 10 of the first embodiment can be obtained.
[0037]
The present invention is not limited to the above embodiments, and various changes can be made. For example, the shape and arrangement of the flocking holes in the flocking table, the thickness and the number of bristles constituting each hair bundle are not limited to those in the above embodiments.
[0038]
【Example】
Hereinafter, the toothbrush of the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
[0039]
[Examples 1 and 2]
A toothbrush having a configuration similar to that of the toothbrush 10 of the first embodiment is defined as a toothbrush of Example 1, and a toothbrush having a configuration similar to that of the toothbrush 20 of the second embodiment is defined as a toothbrush of Example 2, and plaque described later is used. The plaque removal rate was evaluated by a model test of the removal rate. FIG. 5 shows the results of the evaluation. As described above, the convex inner / outer step, which is the difference in average flocking height between the central main bristle in the central band-shaped region and the outer main bristle in each outer region, is 1.0 mm in Example 1 and Example 2 Was 0.65 mm. Further, the average of the tilt angles of all the main bristles with respect to the vertical direction regardless of the tilt direction was 6.6 degrees in Example 1 and 6.0 degrees in Example 2.
[0040]
[Comparative Examples 1 to 3]
A commercial product A (trade name "Oral-B crossaction [soft 35 compact]" manufactured by Oral-B Laboratories) was used as the toothbrush of Comparative Example 1, and a commercial product B (trade name "Aqua Fresh Twist Cloth [Futsu]" Smith Kline). Beauchamp Pharmaceutical Co., Ltd.) was used as the toothbrush of Comparative Example 2, and a commercially available product C (trade name “PC Clinica Root Care [Usu]” manufactured by Lion) was used as the toothbrush of Comparative Example 3. For each toothbrush, calculate the inner and outer steps, which are the differences in the average bristle height between the central main bristle in the central band-shaped region and the outer main bristle in each outer region, and the tilt angle of the main bristle with respect to the vertical direction regardless of the tilt direction. The average was calculated, and the plaque removal rate was evaluated by a model test of the plaque removal rate described below. FIG. 4 shows the results of the evaluation. The calculated inner and outer steps were -0.5 mm in Comparative Example 1, 0.0 mm in Comparative Example 2, and +0.7 mm in Comparative Example 3. The average of the tilt angles of the main bristle with respect to the vertical direction regardless of the tilt direction was 15 degrees in Comparative Example 1, 10 degrees in Comparative Example 2, and 0 degrees in Comparative Example 3.
[0041]
[Model test of plaque removal rate]
As shown in FIG. 3, an interdental model 30 was formed from an aluminum block in which the curved surfaces of R4 faced each other, and a video tape magnetic layer 31 was attached to the surface of the interdental model 30 as a plaque model. As a video tape, "S'RIBBON" standard type (120 minutes, model number 3T-120SR) of Seiyu private brand was used. The created interdental part model 30 was cleaned by the toothbrushes of Examples 1 and 2 and the toothbrushes of Comparative Examples 1 to 3 using a brushing machine.
[0042]
The brushing conditions were a load of 300 g, a speed of 120 rpm, an amplitude of 30 mm, and a number of times of 120, and Apaguard M Plus (trade name, manufactured by Sanghi Co., Ltd.) as a polishing accelerator was used as the toothpaste. The area of 2πR × 5 mm in width was used as the evaluation area 32 of the interdental part, and after the brushing, the video tape magnetic layer 31 was developed, photographed with a digital camera, and analyzed. By image analysis, the ratio of the area of the portion where the magnetic layer peeled and became white in the evaluation region 32 was calculated, and the ratio was determined as the plaque removal rate (%) in the interdental portion. The results of the evaluation are shown in each frame of FIG.
[0043]
According to the evaluation results shown in FIG. 5, the toothbrushes of Examples 1 and 2 according to the present invention have extremely high evaluations on the effect of removing plaque in the interdental region as compared with the commercially available toothbrushes of Comparative Examples 1 to 3. Is obtained.
[0044]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the toothbrush of this invention, while adjusting the arrangement | positioning of the bristle with a different bristle height and the inclination angle of a bristle, the brushed bristle enables the efficient brushing of the interdental part, and the interdental part. In this case, the effect of removing plaque can be sufficiently exhibited.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing a main part of a toothbrush according to a first embodiment of the present invention.
FIGS. 2A and 2B are a schematic plan view and a partially enlarged view showing a main part of a toothbrush according to a second embodiment of the present invention, and FIG. 2B is a schematic side view.
FIG. 3 is an explanatory diagram of a model test of a plaque removal rate.
FIGS. 4A and 4B are explanatory views of a main bristle whose tip comes into contact with a flat surface when a brush is brushed while a load of 300 g is vertically applied from the rear side of the flocking table.
FIG. 5 is a chart showing evaluation results of a model test for plaque removal rate.
[Explanation of symbols]
10, 20 toothbrush 11, 21 flocking table 12, 22 neck 13 flocking hole 14a, 24a first bristle 14b, 24b second bristle 14c, 24c third bristle 14d, 24d fourth bristle 15a, 25a first bristle bundle 15b, 25b Second hair bundle 15c, 25c Third hair bundle 15d, 25d Fourth hair bundle 16, 26 Central band-like region 17, 27 Outer region 18, 28 Separation line 23a First flocking hole 23b Second flocking hole 23c Third flocking hole 23d 4th flocking hole X Axial direction of toothbrush

Claims (2)

A toothbrush in which a plurality of bristle bundles obtained by bundling a plurality of bristles are planted on a flocking table,
When the tips of the plurality of bristles planted on the flocking table are brought into contact with the flat surface and the brush is brushed while a load of 300 g is vertically applied from the rear side of the flocking table, the brush is applied to the flat surface. Regarding the main bristle, which is a bristle whose tip is in contact, the flocking surface of the flocking table is divided into a central band-shaped region having a width of 3 mm parallel to the axial direction of the toothbrush and a pair of outer regions on both sides of the central band-shaped region. When the main bristle located on the central band-shaped region is a central main bristle, and the main bristle located on the outer region is an outer main bristle,
The average flocking height of the central main bristle is higher than the average flocking height of the outer main bristle in each of the outer regions,
A toothbrush wherein a part or all of the main bristles are tilted, and an average tilt angle of all the main bristles with respect to a vertical direction is 2.5 to 15 degrees. The toothbrush according to claim 1, wherein the average bristle height of the central main bristle is 0.1 to 4.0 mm higher than the average bristle height of the outer main bristle in each of the outer regions.

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