JP2010172428A - Toothbrush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a toothbrush by which an interdentium, the side surface sections of teeth facing the interdentium, can easily and surely be brushed without feeling a difficulty in the operation even by an advanced age person at hurried moments such as before the attending to work or the attending to school in the morning. <P>SOLUTION: A total of four or three bristle bundles are arranged in a region of a brush head 11. The bristle bundles are arranged by two on the distal end side of the brush head, and by two or one on the rear side of the brush head. An interval F between the two bristle bundles on the distal side is approximately equal to an interval of the interdentium section of the lower jaw anterior teeth, and an interval W between one bristle bundle among the bristle bundles on the rear side, and one bristle bundle among the bristle bundles on the distal end side is equal to an interval between average interdentium sections being adjacent to each other of sections other than the lower jaw anterior teeth. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a toothbrush that can easily maintain dental health.

  Maintaining healthy teeth is important for health and beauty. In particular, it is desirable to encourage daily tooth brushing to remove food residue and plaque between teeth. For this reason, toothbrushing with a toothbrush is important, and many types of toothbrushes such as an interdental brush are commercially available. However, the interdental brush has poor durability, and is easily bent after being used several times, and finally easily breaks. In addition, since the bristles are provided outward around the wire, in an extreme case, the teeth may be scraped off to form a circular hole by the interdental brush. For this reason, the proposal of the toothbrush for facilitating the brushing of an interdental part irrespective of the interdental brush has been made. For example, a structure has been proposed in which toothbrush bristles are arranged in rows at intervals of tooth widths so that brushing between the teeth can be easily performed (Patent Documents 1 and 2). In addition, a structure that facilitates the brushing of the interdental part by arranging the cross-sectional shape of the hair bundle in a triangular shape and disposing it at intervals of the tooth width is proposed (Patent Document 3). By using these toothbrushes, interdental brushing can be easily performed to some extent. Furthermore, a toothbrush for facilitating brushing between teeth has been proposed by paying attention to the fact that the size of the tooth width or the size of the interdental portion is roughly classified into two types (Patent Literature). 4). This toothbrush includes a brush head that includes a rear region in which hair bundles are densely and evenly arranged, and a front region in which a plurality of hair bundles are arranged while maintaining the distance between the two types of interdental portions. ing. According to this toothbrush, the above-mentioned brushing can be performed by inserting the bristles in the front region into the interdental portions on both sides of one tooth.

JP 2002-0778529 A JP 2004-237031 A JP 2007-151704 A Japanese Patent No. 4198740

Although the toothbrushes disclosed in Patent Documents 1 to 3 can brush the interdental portion from the front side or the back side, the toothbrush bristles are inserted between the teeth and reciprocated in the buccal tongue direction. Therefore, the tooth part facing between the teeth cannot be brushed, and there is no interest in such reciprocation.
The toothbrush disclosed in Patent Document 4 can brush the teeth between the teeth by inserting the hair of the toothbrush between the teeth and reciprocating in the buccal tongue direction. However, a certain amount of skill is required to brush between teeth at will. That is, it is insufficient in terms of ease. Before morning work and before going to school, there is a need for something that can definitely brush your teeth even when you are not awake. In addition, it is beneficial to provide a toothbrush that can brush between teeth without requiring the use of subtle arms for the elderly.
From experience in the field of dentistry, reciprocating brushing in the buccal and lingual direction of the tooth portion facing between the teeth with gaps is very important for maintaining healthy teeth.
The present invention makes it possible to easily and reliably brush the tooth side surfaces facing between teeth before a busy morning attending work or attending school, and even elderly people do not feel difficult to operate. An object is to provide a toothbrush.

  In the toothbrush of the present invention, a total of four or three hair bundles are arranged in the region of the brush head, and these two hair bundles are arranged on the front side of the brush head and two or one on the rear side thereof. Be placed. The distance between the two front hair bundles is approximately equal to the interval between the interdentations of the lower jaw front teeth, and one of the rear hair bundles and one of the front hair bundles. The interval between the hair bundles is equal to the interval between the average adjacent interdental portions other than the lower anterior teeth.

  With the above configuration, using the bristles in the tip region of the toothbrush, the bristles are inserted into the slight gap between the root teeth on both sides of one tooth, and penetrated to reciprocate in the buccal tongue direction. can do. Since at most four hair bundles are planted in the brush head, there is no hair bundle that interferes with the teeth when the hair bundle is inserted between the teeth at the root of the tooth. Naturally, since the brush head can be made small, it is easy to handle, and interdental brushing by reciprocating movement in the buccal tongue direction can be performed easily and reliably before a busy morning commute. Even elderly people do not need difficult movements. Furthermore, since it is possible to brush between two teeth at a time, it is efficient. In addition to this, this toothbrush is compact and convenient to carry, and it enables continuous interdental brushing without departing from daily habits at business trip destinations and travel destinations.

  It should be noted that human teeth have teeth of approximately the same size in the upper jaw, and for the lower jaw, the front teeth are small, but the other teeth are almost the same as the upper teeth. It is that we focused on a certain point. For this reason, with the exception of the lower teeth of the lower jaw, it is possible to obtain a single tooth due to the high elasticity and flexibility provided by the hair bundle, if the distance between the other teeth is the same as that of the average interdental space. The hair bundle can be freely inserted between the root teeth on both sides of the hair. Therefore, any portion of the teeth other than the front teeth of the lower jaw can be easily brushed by the toothbrush with the portion facing the teeth. Since the tooth width size and thus the distance between adjacent teeth changes depending on the tooth growth age classification of infants, children, adults, etc., it may be an age-specific toothbrush according to the above-mentioned tooth age classification.

  The area of the brush head may have a margin of 1.5 mm or less at the outer edge of the arrangement position of the four or three hair bundles. As a result, the brush head can be made small, and the insertion of the back teeth between the teeth can be facilitated.

  The handle of the toothbrush has a curved portion that curves in a concave shape on the back side opposite to the side of the hair bundle, and has an overall shape that is located in a region opposite to the side of the hair bundle with the surface of the brush head as a reference plane In the handle, the grip portion can be thicker than the neck portion connected to the brush head. This makes it easy to brush between teeth even before a busy morning work or before school. Moreover, it becomes easy for an elderly person to perform interdental brushing without difficulty.

  A second brush head is provided in a handle portion opposite to the brush head, and a plurality of hair bundles can be densely and evenly arranged on the second brush head. Thereby, it is possible to brush the crown or occlusal portion using the second brush head hair bundle on the opposite side. This dense and evenly arranged hair bundle does not interfere with the interdental brushing by the four or three hair bundles.

  In the case where a total of four hair bundles are provided in the region of the brush head, the distance between the two back hair bundles is wider than the distance between the two front hair bundles, and the front hair bundle and the back The line connecting the side hair bundle can be configured to be inclined with respect to the center line of the brush head so as to approach the center line toward the front side. As a result, when inserting the first hair bundle on the front side and the one hair bundle on the rear side between the teeth on both sides of the teeth other than the lower anterior teeth, the toothbrush is tilted sideways so that the lower jaw and upper jaw In both cases, the above insertion can be easily performed.

  In the case where a total of three hair bundles are provided in the region of the brush head, a rotation mechanism that rotates 180 ° so that the hair bundle planting portion of the brush head is reversed from front to back can be provided. Thus, the intermaxillary brushing of the mandibular front teeth is performed in the form of (two front side hair bundles + one back side hair bundle). It can be carried out in the manner of the hair bundle 2). In interdental brushing other than the mandibular front teeth, the toothbrush can be placed sideways, and the above-mentioned inclination can be taken between the front side hair bundle and the back side hair bundle to facilitate insertion. In this case, it is preferable to provide a locking mechanism or the like that does not rotate any more unless a predetermined stress is applied at a fixed position rotated by 180 °. In this case, a more surprising dynamic design can be configured.

  According to the toothbrush of the present invention, the tooth side surface facing between the teeth can be brushed between the teeth easily and surely before going to work or going to school in the morning and without feeling difficult to operate even for the elderly. can do.

It is a front view which shows the toothbrush in Embodiment 1 of this invention. It is a side view of the toothbrush of FIG. It is a perspective view of the part of the brush head of the toothbrush of FIG. It is a figure which shows a toothbrush attitude | position when brushing between the teeth of a lower jaw tooth with the toothbrush of FIG. It is a figure which shows a toothbrush attitude | position when brushing between the teeth of the upper jaw tooth with the toothbrush of FIG. It is a figure which shows the toothbrush in Embodiment 2 of this invention. It is a figure which shows a toothbrush attitude | position when inserting the brush head of the toothbrush of FIG. 6 between the back teeth of the lower right back side of a lower jaw. It is the enlarged view which looked at FIG. 7 from the lingual side. The toothbrush in Embodiment 3 of this invention is shown, (a) is the state which has arrange | positioned two hair bundles to the front side, and one hair bundle on the back side, (b) is the hair bundle of the state of (a) It is a figure which shows the state which rotated the planting board 180 degrees. It is a figure which shows the toothbrush in Embodiment 4 of this invention.

(Embodiment 1)
FIG. 1 is a front view showing a toothbrush 10 according to Embodiment 1 of the present invention, and FIG. 2 is a side view of the toothbrush 10. FIG. 3 is a perspective view of a portion of the brush head 11. The toothbrush 10 is characterized in that the brush head 11 does not have a uniform density and a densely arranged hair bundle, and a total of four hair bundles are discretely arranged. In other words, the focus is on interdental brushing, and only the hair bundles mainly for interdental brushing are arranged. Since there is no densely arranged hair bundle that brushes the tooth surface and gums, it is possible to concentrate on interdental brushing without being disturbed. Brushing the gingiva and tooth surface can also be performed with four hair bundles. The importance of interdental brushing is significantly greater than the importance of brushing of gingiva and the like, and it may be performed to the secondary by the above-mentioned four hair bundles, which are mainly intended for interdental brushing.

The brush head 11 has two rows of hair bundles. The tufts A ₁ of the front side of the row A, the interval W between the tufts A ₂ of the rear side is substantially equal to the spacing between teeth adjacent non average mandibular anterior teeth. The same applies to the B column, distance W between the tufts B ₂ of the front side of the hair bundle B ₁ and the rear is approximately equal to the spacing between teeth adjacent a mean other than mandibular anterior teeth. The interval W between the hair bundles is the distance between the centers of the hair bundles. In the case of adults, the center interval W of the hair bundle is preferably 5 mm to 11 mm, and is more common, and the preferable center interval W is 5 mm to 8 mm. The center interval W of the hair bundle is “the distance in the longitudinal direction of the hair bundle in the row” and corresponds to “substantially, the interval between the average adjacent interdental portions of the portion other than the lower anterior teeth”. The average diameter of the hair bundle should be 2 mm or less at the root, 1.5 mm or less in consideration of penetration between teeth, and 1.2 mm or less in the case of a narrow human between teeth. It is good. However, in the toothbrush of the present invention, since the bristle bundle is formed of resin, the bristle bundle is rich in flexibility and easily bent. Therefore, a small amount of incompatibility of the bristle bundle can be easily eliminated by bending the bristle bundle or the like. . In this respect, it is greatly different from the interdental brush in which the resin bristles are arranged radially around the wire, which is a great advantage of the toothbrush of the present invention. The length of the hair bundle should just extend 7 mm or more from the surface of the brush head 11. In addition, in FIG. 1, although the hair | bristle bundle is expressed by one cylinder, it is a bundle | bundle (made of resin) made from a plurality of fine diameters (about 10 to 30) like a normal commercial product. .

The toothbrush 10 of the present invention is based on the following knowledge and idea.
(S1) Improvement of ease and certainty of interdental brushing:
In the structure of the toothbrush 10 capable of brushing between teeth and brushing the occlusal surface and gingiva, when inserting and penetrating the hairbrush of the toothbrush between the teeth, the hair bundle that interferes with the operation is minimized. is important. For this purpose, it is important to remove from the brush head 11 a hair bundle mainly intended for brushing of tooth surfaces other than the gingiva and the interdental portion. In particular, when brushing a tooth for a short time or brushing the elderly, it is important to have a simple structure in which only a hair bundle mainly for interdental brushing is arranged.
(S2) Improvement of operability of toothbrush:
The brush head 11 should be as small as possible, and the interdental brushing from the back side of the back teeth can be facilitated by making it small. For this reason, in the region of the brush head 11, the margin Q of the outer edge of the arrangement position of the hair bundle is preferably 1.5 mm or less, and more preferably, the margin Q is 1.0 mm or less. In FIG. 1, the margin Q portion is light-colored for identification, but in reality, there is no difference from the other portions of the brush head surface.
In addition, the toothbrush handle 12 has a curved portion 12w that curves in a concave shape on the back side opposite to the hair bundle side, and has a surface 11p of the brush head as a reference surface K on the side opposite to the hair bundle side. It has an overall shape located in the area. The thickness of the grip portion 12g is preferably thicker than the neck portion 12n connected to the brush head.
(S3) Human tooth shape:
Human teeth are almost the same, except for mandibular anterior teeth, both large and small. For this reason, humans have an average tooth width or an average interval between adjacent teeth (distance) other than the lower anterior teeth. The lower anterior teeth also have an average tooth width or an average interval (distance) between adjacent teeth.
(S4) Importance of daily interdental brushing:
The reason why teeth become unhealthy due to food debris and become dental caries and periodontal disease is largely due to food debris accumulated between the teeth. It doesn't have to be perfect, but you can maintain healthy teeth every day by removing food waste and plaque between teeth. The brushing of the tooth surface and gingival part other than the interdental part may be omitted if the brushing of the interdental part is performed daily.
The toothbrush 10 shown in FIG. 1 and FIG. 2 is configured based on the idea of (S1) to (S4) above, and the brush head 11 is arranged with two rows apart from the A row and the B row. center distance W of the front-side tufts a ₁ and center-to-center distance W between tufts a ₂ of the rear side, also the front side tufts B ₁ of row B and tufts B ₂ of the rear side, the average The distance between adjacent teeth is a typical distance.

Furthermore, in the toothbrush 10, for brushing between the teeth of the lower anterior teeth, the center distance F between the bristle bundles A ₁ and B ₁ in the front side of the columns A and B, next to the average mandibular incisors The interdental distance matches. The center-to-center distance F of the hair bundle is preferably about 3 mm to 6 mm, and the center-to-center distance F having high commonness is about 5 mm. This center-to-center distance F is the distance between the two hair bundles on the front side. For this reason, it is possible to brush the interdental portion of the lower jaw front teeth by using the toothbrush 10 in an upright manner. As a result, all the interdental portions of the upper jaw and the lower jaw can be brushed efficiently and easily by two interproximal portions, that is, by interproximal portions on both sides of one tooth. At this time, unlike an interdental brush wire, it does not deteriorate and break in a short period of use. The fact that all interdental brushing is possible will be described in detail later. Further, as described above, this toothbrush is small and convenient to carry, and it is possible to perform interdental brushing continuously every day without a rest period at a business trip destination, a travel destination, or the like.

FIG. 4 is a diagram illustrating the posture of the toothbrush when the entire interdental portion of the lower jaw is brushed. And using a model M of human teeth, and the centrifugal side (molar) from mesial (anterior), the right seven _R 1 to R _7, left grows seven teeth of _L 1 ~L ₇ Yes. Tooth width of the anterior d is much smaller than the tooth width D of the other teeth (exemplifies the tooth width of 4 in R _4). Therefore, the interval between the interdental portions of the lower anterior teeth is also smaller than the interval between the adjacent interdental portions of other portions. The spacing between adjacent teeth, for example, (R ₃ and interdental part between R ₄₎ the spacing between the (R ₄ and interdental part between R _5), namely interdental portions on both sides of the R ₄ The distance between.

First, when the front teeth are brushed between the teeth using the toothbrush 10 in the present embodiment, the toothbrush 10 is used upright as shown in FIG. By tresses A ₁ and B ₁ of the front side, for example so as to sandwich the L _1, insert the tufts A ₁ and B ₁ between the teeth on either side root of L _1, along the buccolingual direction or Kuchibirushita direction reciprocating Can do exercise. Since the space between the teeth of the front teeth is narrow, when the hair penetration is difficult, the food residue is not likely to be clogged from the beginning, so that the brushing effect can be sufficiently obtained just by striking with the tip of the hair. That is, no food residue accumulates between the teeth without a slight gap, and no plaque adheres, so there is no need to forcibly pry it through the hair bundle. Further, there may be a state in which only a few of the many hairs constituting the hair bundle are inserted between the teeth, and the remaining many hit the tooth surface.

For other than lower forehead teeth, as shown in FIG. 4, depending on whether front side (cheek side or lip side), back side (lingual side), right side or left side, use A row of hair bundles, B Use columns or change. However, unlike the front teeth, the toothbrush is used in a horizontal or oblique horizontal posture without standing. For the right front side of Figure 4, with the bristle bundle B ₁ and B ₂ of the center-to-center distance W, so as to sandwich the tooth, inserted through these tresses B ₁ and B ₂ between the roots of the teeth of both sides of the teeth Then, reciprocate in the cheek tongue direction. Inserting tufts _{B 1} and _{B 2,} for the right front side of the _R 2 to R _7, can be carried out in the same way. As for the right rear side of the back side thereof, the left and right of the brush head is reversed, so the tufts A ₁ and A ₂ to brushing is inserted between the teeth on either side tooth root. The left front side, as shown in FIG. 4, inserting the bristle bundle A ₁ and A ₂ between the teeth of the root portion. In this way, since there is no hair bundle mainly intended for brushing of the tooth surface and gingiva other than the interdental part, it is easy and easy to avoid all interference with the dense hair bundle. Brushing between the teeth can be easily performed.

  It should be noted that the above-described hair bundle inserted between teeth cannot be passed between teeth without a slight gap, and does not need to be forced to pass. And two hair bundles (moving hair bundles) that are said to be inserted are listed two by two, and in the following explanation, two are listed as well, but there is no slight gap between the teeth corresponding to one of the two hair bundles Only one hair bundle needs to be passed through. Since the hair bundle is rich in flexibility, it is possible to easily penetrate one of the hair bundles between the teeth and poke the tip of the other hair bundle against the surface of the teeth. Both hair bundles can operate effectively to maintain dental health. In some cases, the toothbrush may be operated with the intention of using only one of the two hair bundles listed above and not using the other.

FIG. 5 shows a maxillary tooth model M. FIG. The biggest difference with the lower jaw is that the front teeth are larger than that of the lower jaw. For this reason, in the upper jaw, the toothbrush is used sideways or obliquely sideways for the front teeth. As for the other teeth, as in the case of the lower jaw, it is possible to easily and easily brush all interdental portions of the upper jaw without being disturbed by the dense hair bundle.
By using the toothbrush 10 according to the present embodiment from the brushing method shown in FIGS. 4 and 5, it is possible to brush between the teeth of all teeth including the front teeth. Unlike the interdental brush using a wire, this interdental brushing does not cause tooth wear and the like, so that there is no significant adverse effect and excellent durability. For this reason, brushing between teeth can be easily made on a daily basis. In FIGS. 4 and 5, it is assumed that a hair bundle (operating hair bundle) is inserted in both interdental portions of one tooth. However, (1) when both hair bundles are inserted between both teeth of one tooth, (2) only one of the hair bundles is inserted between the teeth, and the other brushes the front and back surfaces of the interdental portion. In the case, (3) both may be the case where the front and back surfaces of the interdental portion are brushed, and (4) the case where one hair bundle is used and the other is used without intention. That is, insertion between teeth is not essential. Moreover, even if it says that a hair | bristle bundle is inserted between teeth, it is not necessary to insert all the hair | bristle bundles. It should be noted that the arrangement of the bristles in the toothbrush of the present invention should be determined based on substantial contact with the teeth when the tips of the bristles of the toothbrush are applied to the dentition. Therefore, for example, in FIG. 2 or FIG. It should be understood that any number of rows of hair bundles shorter than the length of the hair bundle shown are included in the scope of the present invention.

  The above description is a case where a person who is familiar with the operation of the toothbrush of the present embodiment and has an ideal tooth arrangement brushes two adjacent interdental portions simultaneously with emphasis on efficiency. In this case, it is possible to brush between two adjacent teeth at the same time, so that the user feels profitable and is actually efficient. However, there are actually people with poor tooth alignment, and depending on the physical condition and mood of the day, it may be troublesome to brush two interdental parts at the same time. In such a case, use only one hair bundle on the front side, insert the hair bundle only in one interdental region, and perform brushing by reciprocating along the cheek tongue direction. There may be. In this case, when there are two rows, when the hair bundle at the tip of one row is worn out, the hair bundle at the tip of the second row can be used instead of the worn hair bundle. And since there is an interval in the width direction between the two rows, the hair bundle at the tip does not get in the way. For example, in the case of non-elderly employees, office workers before going to work, pre-school students, students, the toothbrush of the present invention can easily and reliably brush two adjacent interdental parts simultaneously. The user can enjoy the efficiency.

  4 and 5 described above illustrate an ideal case where two adjacent interdental portions are brushed simultaneously using two hair bundles. Even in the embodiment described below, a case where two adjacent interdental parts are brushed at the same time will be described, but one interdental part may be brushed in order using one hair bundle, There are actually many such uses. However, even if a method of using brushing one interdental portion in sequence using one bristle bundle is used, it does not reduce the value of the toothbrush of the present invention. According to the configuration of the toothbrush of the present invention, it is possible to efficiently brush two interdental portions simultaneously as described above, and further, brushing is sequentially performed for each interdental portion with one bristle bundle. You can also. Even when brushing for each interdental part, because of the configuration in which the interval between the hair bundles is wide as described above, when the brushing of one interdental part is performed, the surrounding hair bundles may be obstructed by other teeth. There are also no advantages, and other advantages.

(Embodiment 2)
FIG. 6 is a diagram showing the toothbrush 10 according to the second embodiment of the present invention. The feature of the toothbrush in the present embodiment is that the hair bundles A ₂ and B ₂ on the back side of the front side hair bundles A ₁ and B _{1 of} the A row and the B row implanted in the brush head 11 are The brush head 11 is located on the end side in the width direction. For this reason, in one row, the straight line connecting the front side hair bundle and the back side hair bundle is inclined with respect to the axis of the toothbrush and forms an angle θ. In addition, the margin Q of the outer edge of the arrangement position of the hair bundle is preferably 1.5 mm or less, and more preferably 1.0 mm or less. In FIG. 6, the margin Q portion is a light ink color for identification, but actually there is no difference from other brush head surface portions.

With such an angle θ, the effects shown in FIGS. 7 and 8 can be obtained. FIG. 7 shows the arrangement of the toothbrush when brushing between the teeth on the right back side of the lower jaw, and FIG. 8 is a view of the brush head 11 of the toothbrush viewed from the back side (lingual side). When brushing the back side of the back teeth, the toothbrush must be tilted, and the brush head 11 is naturally tilted. If the angle θ shown in FIG. 6 is set equal to the inclination angle of the toothbrush in this case, as shown in FIG. 8, the hair bundles A ₁ and A ₂ can be easily inserted between the teeth on both sides of R _6. be able to. This makes it easy to brush the back teeth on the back side, which is not so simple and causes considerable difficulty for the elderly, and is useful for maintaining the health of all parts.

(Embodiment 3)
FIG. 9 is a diagram showing the toothbrush 10 according to the third embodiment of the present invention. FIG. 9A shows two hair bundles A ₁ and B ₁ on the front side and one hair bundle C on the rear side. (B) is a diagram showing a state in which one hair bundle C is located on the front side and two hair bundles A ₁ and B ₁ are located on the rear side. In the present embodiment, a total of three hair bundles are arranged on the brush head 11. The hair bundle is planted on the hair bundle planting plate 11t, and the hair bundle planting plate 11t is rotatably attached to the head base portion 11b, and the two fixed points (the position of FIG. 9 (a) and FIG. 9 (b)). This locking only needs to have a locking force to maintain the position of the above two fixed points during brushing. Depending on the selection of the portion to be brushed (mandibular anterior teeth, other portions, etc.) It is good to be able to turn again. The positions in FIGS. 9A and 9B are for the next brushing location.
Position of FIG. 9A: When brushing between the teeth on both sides of the mandibular anterior teeth Position of FIG. 9B: When brushing between the teeth on both sides of the teeth other than the lower jaw anterior teeth

In the case of interdental brushing of the lower jaw front teeth, the interdental brushing of the lower jaw front teeth can be easily performed by using the toothbrush 10 in the state of FIG. 9A as shown in FIG. In interdental brushing on both sides of the teeth other than the lower anterior teeth, it is not impossible to perform interdental brushing in the state shown in FIG. It is desirable that the front side hair bundle and the back side hair bundle have an inclination in the direction as shown in FIG. In the state of FIG. 9A, the straight line connecting the front hair bundle A ₁ or B ₁ and the rear hair bundle C does not intersect the center line of the brush head 11 on the front side but intersects on the rear side. . That is, the inclination direction is reversed. By rotating the state in FIG. 9A by 180 ° to the state in FIG. 9B, the inclination direction becomes the same direction as that shown in FIG. 6, and interdental brushing is performed on the back teeth. Can be easily. The half of the apex angle of the isosceles triangle formed by the three hair bundles A ₁ , B ₁ , and C shown in FIGS. 9A and 9B is preferably close to the angle θ shown in FIG. As described above, the margin Q of the outer edge of the hair bundle arrangement region of the hair bundle planting plate 11t is preferably 1.5 mm or less, and more preferably 1.0 mm or less. In FIG. 9, the margin Q portion is lightly colored for identification, but actually there is no difference from the hair bundle planting plate 11 t portion.

(Embodiment 4)
FIG. 10 is a diagram showing the toothbrush 10 according to the fourth embodiment of the present invention. The toothbrush of the present embodiment has a brush head 11 at one end of the handle, three or four hair bundles are arranged, and a second brush head 21 at the opposite end 12e. A hair bundle 22 is provided on the second brush head 21. The hair bundle 22 may be in any form as long as it is dense. A plurality of hair bundles may be arranged somewhat discretely. The dense hair bundles 22 can brush the tooth surfaces and gingiva other than between the teeth. The three or four hair bundles arranged on the brush head 11 may be any of the hair bundles of the first to third embodiments.

  According to the toothbrush of the present embodiment, it is possible to brush the crown or occlusal portion using the second brush head bristle bundle on the opposite side. This densely arranged hair bundle does not interfere with the interdental brushing by the above-mentioned four or three hair bundles.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  According to the toothbrush of the present invention, the tooth side surface facing between the teeth can be brushed between the teeth easily and surely before going to work or going to school in the morning and without feeling difficult to operate even for the elderly. can do.

10 toothbrush, 11 brush head, 11b brush head base, 11p brush head surface, 11t hair bundle planting plate, 12 toothbrush handle, 12e handle other end, 12g gripping portion, 12n neck portion, 12w , 20 mucosa, hair bundle on the front side of the A ₁ A row, hair bundle on the back side in the case of A ₂ four hair bundles, hair bundle on the front side of the B ₁ B row, hair bundle on the front side of B ₂ Rear hair bundle, C One of the hair bundles in the case of all three hair bundles, F Center spacing of the two front hair bundles (average minimum interdental distance of the lower jaw front teeth), K Brush head surface Reference plane by M, M tooth model, Q margin, W Center distance between the hair bundle on the front side and the hair bundle on the back side (average minimum interdental distance other than lower anterior teeth).

Claims (6)

A total of four or three hair bundles are arranged in the area of the brush head,
Two hair bundles are arranged on the front side of the brush head, two or one are arranged on the rear side thereof,
The distance between the two hair bundles on the front side is substantially equal to the distance between the interdentations of the lower anterior teeth,
The distance between one of the hair bundles on the back side and one of the hair bundles on the front side is the distance between the average adjacent interdental portions of the part other than the lower anterior teeth. A toothbrush characterized by being equal to.   The toothbrush according to claim 1, wherein the brush head region has a margin of 1.5 mm or less at an outer edge of the arrangement position of the four or three bristle bundles.   The handle of the toothbrush has a curved portion that curves in a concave shape on the back side opposite to the side of the hair bundle, and is located in a region opposite to the side of the hair bundle with the surface of the brush head as a reference surface. The toothbrush according to claim 1, wherein a thickness of the grip portion is thicker than a neck portion connected to the brush head in the handle.   The second brush head is provided at a portion of the handle opposite to the brush head, and a hair bundle is disposed on the second brush head. Toothbrush.   In the case where a total of four hair bundles are provided in the region of the brush head, the distance between the two back hair bundles is wider than the distance between the two front hair bundles, and the front hair bundle and the back The line connecting the hair bundle on the side is inclined so as to approach the center line toward the front side with respect to the center line of the brush head, according to any one of claims 1 to 4. The toothbrush described.   In the case where a total of three hair bundles are provided in the region of the brush head, a rotation mechanism is provided that can obtain a locking feeling by rotating 180 ° so that the hair bundle planting portion of the brush head is reversed. The toothbrush of any one of Claims 1-4 characterized by the above-mentioned.

Images