Brushing – scrubbing – and general cleaning – Implements – Brush or broom
Reexamination Certificate
2000-02-01
2001-11-27
Till, Terrence R. (Department: 1744)
Brushing, scrubbing, and general cleaning
Implements
Brush or broom
C015S207200
Reexamination Certificate
active
06321407
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention concerns a toothbrush having a brush head made from plastic and individual plastic bristles vertically embedded into the brush head disposed at a small separations with respect to each other.
Toothbrushes of this type are known in the art (WO 96/27 308). In contrast to conventional toothbrushes with which the bristles are collected into individual bundles and a plurality of bundles are mounted to the brush head, the above mentioned toothbrushes have the advantage that the ends of the bristles which are substantially active during cleaning are evenly distributed over the entire brush surface so that the medically recommended cleaning method from red to white, that is to say a substantially vertical guiding of the brush with an overlapping slightly pivoting motion, leads to cleaning (of the teeth) and massaging (of the gums) in the entire region swept over by the bristle stock. With toothbrushes having the conventional bundle stock, certain parts of the gums and or teeth remain untreated. One had tried to counteract this problem by disposing the bristles in a non-parallel fashion within the bundle so that they were spread apart. This had however, during cleaning, the consequence that the bristles stood at differing angles with respect to the surface being cleaned. This can cause injury to the gums. In addition, the tilted bristles are more active in the transitional region towards the side of the bristle than at their rounded bristle ends. Since such transition regions can be edged if the bristles are not perfectly rounded, injury to the gums or fine lesions of the enamel can result.
Among other factors, the flexural strength of the bristles is important for the effectiveness of the toothbrush. In a bundle, this is substantially determined by the length of the bundle and the packing density of the bristles in the bundle as well as by the diameter of the individual bristles, wherein the latter has the smallest influence of all since the bristles in the bundle support one another so that the flexural strength of the bundle is many times larger than that of the individual bristles. In the above mentioned conventional toothbrush (WO 96/27 308) having individually standing bristles, the flexural strength is additionally influenced by the separation of the bristles from another. Due to this separation, the influence of the bristle diameter is more prominent than in bundles. The flexural strength can thereby be varied in steps finer than those standard with conventional toothbrushes: namely, “soft”, “middle” and “hard”. The reduced embedded length of the individual bristles compared to bundles allows the height of the brush head to be reduced.
Dentistry has pointed out that the care and cleaning of the molar teeth, in particular on the outer side of the teeth (distal), is substantially worse than in the front tooth region. This has to do with the poor accessibility of the molars, the frequently confined space of the distal region which, given abnormalities in tooth formation, can assume serious dimensions, and the frequent increased sensitivity and irritation in the distal region of the molars which, depending on how the toothbrush is introduced, can even induce vomiting. Even the red-white cleaning method recommended by dentists, can not be properly carried out in the molar region due to the confined space. The increased pressure also causes injury to the gums and lesions in the enamel in this region.
It is the underlying purpose of the invention to create a toothbrush which also permits easy application in the molar region allowing the red-white method to be carried out and particular facilitating equally satisfactory cleaning of the molar regions in the distal area.
SUMMARY OF THE INVENTION
Departing from the toothbrush in accordance of the precharacterizing part of claim 1 WO 96/27 308, this purpose is achieved in accordance with the invention in that the portion of the brush head having bristles contains approximately 400 to 800 individual bristles per cm
2
and the overall height of the toothbrush resulting from the free length of the individual bristles and the thickness of the brush head assumes a value between 6.5 and 11 mm.
The toothbrush in accordance with the invention is initially distinguished by an extremely small height formed from the free bristle length and the thickness of the brush head. This height assumes values between 6.5 and 11 mm, whereas the conventional toothbrushes extend up to 20 mm. Due to this flat construction, it is also easy to clean the distal region of the molars and the red-white method can be utilized in this location with the applied pressure being completely determined by the user, since even the inner sides of the cheeks no longer exercise any pressure on the toothbrush. The plurality of narrowly separated individual bristles also allows for adjustment of the flexural strength despite the reduced length of the individual bristles in a user specific manner.
Flat toothbrushes have been proposed (DE 93 03 339 U1) with which the horizontal length of conventional brushes having bundles has simply been shorted. This, however, leads to an increase in the stiffness of the conventional toothbrush having bristle bundles. This was, in fact, the specific intent of this prior art in order to achieve improved mechanical friction. Precisely this is, however, undesirable for medical reasons.
Another conventional embodiment (EP 0 060 592) led to the same negative effects. In this embodiment, the individual bristles are disposed at narrow separation from each other and held in a frame-like brush head structure. In this case, the flexural strength is even larger than for bristle bundles, since the individual bristles support each other along their entire length.
An additional conventional toothbrush (DE 296 00 139 U1) has microfibers introduced onto the brush head proximate conventional bristle bundles. These microfibers are of low flexural strength and therefore extremely soft so that they cannot exercise any mechanical effect on the tooth coating. They have, at most, a polishing effect. Such microfibers can also not be directly attached to the brush head due to their extremely small diameter.
The configuration in accordance with the invention is equally effective both for manual toothbrushes having a handle attached to a brush head as well as for electrically driven toothbrushes with which the brush head is mounted onto a drive.
It is preferred when the free length of the individual bristles assumes a value between 5 and 9.5 mm and the thickness of the brush head a value between 1.5 and 3.0 mm. The low thickness of the brush head is particularly facilitated by the fact that the individual bristles must only be embedded over a small length in the brush head plastic in order to achieve the necessary pull-out strength.
The configuration in accordance with the invention further allows a shape to be given to the active brush surface, wherein the free ends of the individual bristles lie on a constant or varying curved enveloping surface the separation of which from the brush head surface varies by up to 3 mm.
This topography guarantees that not only the surfaces of the teeth but also the inter-dental regions are reached and cleaned by the bristles. In the vicinity of the gums, special massage effects result with the longer bristles being deflected when pressed to act along the outer portion of the bristles and cause a rubbing massage motion. The shorter bristles are active at their ends.
An additional variation for the flexural strength can be achieved when the diameter of the individual bristles lies between 0.095 and 0.225 mm with the chosen effective diameter being smaller, the smaller the free length of the individual bristles.
It is thereby preferred, with a free length for the individual bristles of between 5 to 7 mm, for their diameter to be chosen between 0.095 and 0.175 and, with a free length of 7 to 9.5 mm, to have a diameter between 0.125 and 0.225 mm.
A preferred embodiment of the toothbrush in accordance with t
Coronet-Werke GmbH
Till Terrence R.
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