DE202017007309U1 - Oral care device - Google Patents

Abstract

Oral care device (10, 300, 310) with an overall length extension (15, 720) extending between a proximal end (17) and a distal end (19, 760), the distal end (19,760) being the proximal end (17) opposite, wherein the oral care device (10, 300, 310) comprises a head piece (14) at the proximal end (17) and a handle (12, 600, 610), the handle (12, 600, 610) at least partially from a Material is made with a density that is higher than the density of the material of the head piece (14), wherein the oral care device (10, 300, 310) has a center of gravity (500, 510) at a distance (740) measured from the distal end (19, 760), the headpiece being repeatedly attachable to and detachable from the handle

Description

FIELD OF THE INVENTION

The present disclosure relates to an oral care device that includes a headpiece and a handle, the headpiece and the handle being made from materials having different densities. The present disclosure further relates to a method for producing such an oral care device and a set comprising such an oral care device and a holder for holding the device.

BACKGROUND OF THE INVENTION

Heads and handles for oral care devices such as manual toothbrushes are well known in the art. In general, tufts of bristles for brushing teeth are attached to a bristle carrier or an attachment surface of the brush head piece which is intended to be inserted into the oral cavity of a user. The handle is usually attached to the head piece, the handle being held by a user while cleaning. Manual toothbrushes are usually made of relatively light materials, e.g. B. polypropylene, optionally in combination with thermoplastic elastomers. As a rule, these thermoplastic elastomers form gripping elements on the handle of the toothbrush, e.g. B. a thumb rest, which improves the grip properties. Due to the lightweight handle, however, the center of gravity of such manual toothbrushes is relatively close to the toothbrush headpiece, especially when the headpiece is loaded with toothpaste. When the center of gravity is relatively close to the toothbrush head, the toothbrush becomes top-heavy and can easily tip over as soon as toothpaste is applied to the brush head. Toothpaste can stain the surface on which the brush is placed. In order to prevent the loaded toothbrush from tipping over, additional geometric structures such as roller stops / support structures are required. Toothbrushes are known which have such structures in the form of edges attached to the head piece. However, such additional edges are uncomfortable in the mouth during brushing.

Furthermore, brushes comprising relatively lightweight handles, particularly handles made from common plastic materials, e.g. Polypropylene, there is a low product quality perception during use of the brushes.

In addition, in order to clean teeth effectively, suitable maneuverability and good handling properties of the entire toothbrush must be provided, these properties depending, among other things, on the flexural rigidity of the handle and the brush head piece. Usually, handles of toothbrushes are in the form of a linear rod that can be handled and operated by a user as required. It has been shown in the past that manual toothbrushes with lightweight handles, e.g. B. made of polypropylene, are neither convenient to handle nor easy to maneuver in the oral care cavity. Furthermore, the flexural strength of such handles is relatively low. They tend to flex easily and their relatively low flexural stiffness results in decreased plaque removal efficiency on tooth surfaces. Furthermore, such handles provide poor maneuverability in the mouth during brushing. To compensate for this low flexural rigidity, the cross-sectional area of the handle could be increased. However, relatively thick handles can also reduce the ease of turning the brush in the hand, making it difficult for the user to reach all areas of the oral cavity. As a result, the maneuverability of the entire brush is insufficient. However, to achieve and maintain good oral health and prevent gingivitis, it is important to thoroughly clean your teeth and gums, especially in hard-to-reach areas, such as the B. in the area of the posterior molars. Furthermore, gaps between the teeth and the periodontium, the so-called gum furrow, must be cleaned thoroughly, which requires a good and well-coordinated brushing technique which may not be achievable using the aforementioned manual toothbrushes. Furthermore, it is known that users / consumers use different brushing techniques, and therefore it is crucial to identify the optimal ergonomics of a toothbrush in order to provide a good sensory feeling while brushing using all types of brushing techniques.

It is an object of the present disclosure to provide an oral care device that overcomes at least one of the aforementioned disadvantages, particularly an oral care device that does not tip over when loaded with toothpaste and placed on a substantially flat surface. Furthermore, the oral care device should provide more comfort and an improved quality perception as well as better maneuverability in the oral care cavity during cleaning. It is also an object of the present disclosure to provide a method of making such an oral care device.

SUMMARY OF THE INVENTION

According to one aspect, an oral care device is provided, the oral care device having an overall length extension extending between a proximal end and a distal end, the distal end being opposite the proximal end, the oral care device including a headpiece at the proximal end and a handle, wherein the handle is made at least in part from a material having a density that is higher than the density of the material of the headpiece, the oral care device having a center of gravity located at a distance measured from the distal end, the ratio of the distance to the total length dimension of the oral care device is from about 0.30 to about 0.45, preferably from about 0.35 to about 0.42, more preferably from about 0.38 to about 0.41.

According to one aspect, a kit is provided, the kit comprising such an oral care device and a holder for attaching and holding the oral care device.

• - Bereitstellen eines amorphen thermoplastischen Harzes,
• - Bereitstellen von Aluminiumoxid, Bornitrid oder Aluminiumsilicat,
• - Bereitstellen von Eisenoxid,
• - Mischen des amorphen thermoplastischen Harzes, des Aluminiumoxids, Bornitrids oder Aluminiumsilicats und des Eisenoxids zu einer magnetischen und/oder ferromagnetischen Formmasse,
• - Erwärmen der Formmassenmischung zu einer fließfähigen Formmasse,
• - Formen der fließfähigen Formmischung zu einem Griff oder einem Teil eines Griffs,
• - Bereitstellen eines nicht magnetischen und/oder nicht ferromagnetischen Materials und
• - Formen des nicht magnetischen und/oder nicht ferromagnetischen Materials zu einem Kopfstück oder einem Teil eines Kopfstücks.

In one aspect, there is provided a method of making such an oral care device, the method comprising the steps of:

• - providing an amorphous thermoplastic resin,
• - Provision of aluminum oxide, boron nitride or aluminum silicate,
• - Provision of iron oxide,
• - Mixing the amorphous thermoplastic resin, aluminum oxide, boron nitride or aluminum silicate and iron oxide to form a magnetic and / or ferromagnetic molding compound,
• - heating the molding compound mixture to form a flowable molding compound,
• - Shaping the flowable molding mixture into a handle or part of a handle,
• - providing a non-magnetic and / or non-ferromagnetic material and
• - Forming the non-magnetic and / or non-ferromagnetic material into a head piece or a part of a head piece.

Figure list

• 1 eine perspektivische Ansicht einer beispielhaften Ausführungsform einer Mundpflegevorrichtung gemäß der vorliegenden Offenbarung zeigt, wobei das Kopfstück der Mundpflegevorrichtung vom Griff abgenommen ist;
• 2 eine perspektivische Ansicht einer beispielhaften Ausführungsform eines Sets zeigt, das die Mundpflegevorrichtung von 1 und einen magnetischen Halter umfasst, an dem die Mundpflegevorrichtung magnetisch befestigt ist;
• 3 eine grafische Darstellung eines Flussdiagramms zum Formen des Griffs der Mundpflegevorrichtung gemäß der vorliegenden Offenbarung zeigt;
• 4 fünf grundlegende Griffstile zeigt, wie Benutzer eine Zahnbürste während des Putzens halten;
• 5 zwei beispielhafte Ausführungsformen von Mundpflegevorrichtungen gemäß der vorliegenden Offenbarung und einer Mundpflegevorrichtung nach dem Stand der Technik zeigt, wobei die Mundpflegevorrichtungen unterschiedliche Griffmaterialien umfassen;
• 6 die Mundpflegevorrichtungen von 5 mit auf das Bürstenkopfstück aufgetragener Zahnpasta zeigt;
• 7 einen Vergleich von einer der beispielhaften Ausführungsform von 5 und 6 und der Mundpflegevorrichtung nach dem Stand der Technik von 5 und 6 zeigt;
• 8 eine Draufsicht auf eine Mundpflegevorrichtung nach dem Stand der Technik zeigt;
• 9 eine Seitenansicht der Mundpflegevorrichtung von 8 zeigt; und
• 10 eine Seitenansicht einer beispielhaften Ausführungsform einer Mundpflegevorrichtung gemäß der vorliegenden Offenbarung zeigt.

The invention is described in more detail below with reference to various embodiments and figures, in which:

• 1 Figure 12 shows a perspective view of an exemplary embodiment of an oral care device in accordance with the present disclosure with the headpiece of the oral care device removed from the handle;
• 2 FIG. 10 is a perspective view of an exemplary embodiment of a kit incorporating the oral care device of FIG 1 and a magnetic holder to which the oral care device is magnetically attached;
• 3 Figure 12 is a graphical representation of a flowchart for molding the handle of the oral care device in accordance with the present disclosure;
• 4th five basic grip styles showing users holding a toothbrush while brushing;
• 5 Figure 12 shows two exemplary embodiments of oral care devices according to the present disclosure and an oral care device according to the prior art, the oral care devices including different handle materials;
• 6th the oral care devices of 5 Figure 13 shows with toothpaste applied to the brush head;
• 7th a comparison of one of the exemplary embodiments of FIG 5 and 6th and the prior art oral care device of FIG 5 and 6th shows;
• 8th Figure 10 shows a top plan view of a prior art oral care device;
• 9 FIG. 3 is a side view of the oral care device of FIG 8th shows; and
• 10 Figure 12 shows a side view of an exemplary embodiment of an oral care device in accordance with the present disclosure.

DETAILED DESCRIPTION OF THE INVENTION

The oral care device according to the present disclosure comprises a handle and a head piece on which at least one tooth cleaning element, e.g. B. a tuft of bristles and / or an elastomeric element can be attached. The head piece is repeatedly attachable to and detachable from the handle. As an alternative, the head piece can be permanently attached to the handle. The oral care device can be a manual toothbrush. The oral care device can also be an interproximal pick, plaque scraper, or tissue / tongue cleaner.

The oral care device has an overall length extension that extends between a proximal end, ie the end at which the head piece is located, and a distal end. The center of gravity of the oral care device is arranged at a distance measured from the distal end of the oral care device. The ratio of the distance to the overall length of the oral care device is from about 0.30 to about 0.45, or from about 0.35 to about 0.42, or from about 0.38 to about 0.41. Such a relationship provides an oral care device that has a center of gravity closer to the center of the longitudinal extension of the handle when compared to prior art toothbrushes. As a result, when the user holds the oral care device in hand while brushing, the center of gravity is closer to the pivot point of the wrist, allowing better control of the oral care device in the mouth, thereby enabling more precise and accurate brushing movements. In other words, the center of gravity is within the handle (even when the brush head is loaded with toothpaste), allowing users to perform a well coordinated brushing technique with an improved sensory feel while brushing. The center of gravity positioned essentially in the middle of the handle balances the oral care device. The oral care device does not tip over / become top heavy as soon as toothpaste is applied to the brush head. When applying the various cleaning techniques, as in 4th shown, the toothbrush according to the present disclosure has the advantage that the center of gravity is in or very close to the pivot point of the wrist, which enables better cleaning. The handling properties of the oral care device are significantly improved.

The overall length of the oral care device can be from about 180 mm to about 220 mm or about 200 mm. The length of the handle can be 2/3 of the total length of the oral care device.

The oral care device has a front and a rear, the rear facing the front. The front is defined as the side from which the at least one tooth cleaning element extends. The handle has a cross-sectional area that extends substantially perpendicular to the overall length of the oral care device. The height extension of the cross-sectional area is defined as the maximum extension between the front and the rear of the oral care device.

The center of gravity of the oral care device may be at a position closer to the rear than the front of the oral care device, the position being measured along the height of the cross-sectional area of the handle. When the oral care device is loaded with toothpaste and placed on a substantially planar / flat surface, the center of gravity is below the axis of rotation, which results in the entire oral care device being stable and balanced. The oral care device automatically returns to an upright position (i.e., a position that holds the toothpaste away from / opposite the surface) once the oral care device is moved out of the balanced position.

The handle of the oral care device is at least partially made of a material that has a higher density than the density of the material from which the head piece - optionally including the shaft / neck - is made. At least a portion of the head piece, e.g. B. the neck / shaft and the bristle carrier, can be made of a material having a density of about 0.5 g / cm ³ to about 1.2 g / cm ³ or from about 0.7 g / cm ³ to about 1.0 g / cm ³ or about 0.9 g / cm ³ . For example, the head piece and neck may be made from a thermoplastic polymer, e.g. B. polypropylene with a density of about 0.9 g / cm ³ , be injection molded. In contrast to the head piece, the handle is at least partially made of a material with a significantly higher density, e.g. B. a density of about 2.1 g / cm ³ to about 3.1 g / cm ³ or from about 2.3 g / cm ³ to about 2.8 g / cm ³ or from about 2.5 g / cm ³ to about 2.7 g / cm ³ .

Usually, users are used to the fact that products, especially in the field of personal health care, have a specific weight that guarantees high product quality and provides a pleasant feeling during use of the product. Since the weight of the handle material is relatively heavy, the oral care device according to the present disclosure provides such high quality perception and comfort during use. The oral care device according to the present disclosure provides a superior product quality perception.

An oral care device comprising a head piece that is repeatedly attachable to and detachable from the handle provides several advantages: While the high quality and relatively expensive handle of the oral care device compared to ordinary manual toothbrushes which are thrown away after about three months of use The relatively inexpensive brush refill can be used on a regular basis, e.g. B. after about three months, be replaced. This provides an inexpensive and environmentally friendly high quality oral care device with improved handling properties. The head piece of the oral care device can be fastened to the handle via a snap-in locking mechanism. For example, the handle can comprise a connector that can be inserted into a hollow section in the head piece, or the head piece can comprise a connector that can be inserted into a hollow section in the handle. As an alternative, one connector can be used as another, i.e. H. be provided as a separate part of the oral care device. Such a connecting piece can be inserted into a hollow section in the handle or into a hollow section in the head piece, whereby a sufficiently strong connection and sufficient stability between the head piece and the handle are provided to enable a user to use a Perform the cleaning process.

In the past it has been shown that after using the brush / after brushing their teeth, the user generally keeps the wet brush in a toothbrush cup to dry it. However, liquids that have run off in a classic toothbrush cup are caught and accumulated at the bottom of the cup, and the liquids remain in contact with the toothbrush for a longer period of time. Since the cup is only open on one side, the toothbrush dries relatively slowly. Bacteria living in a wet environment can grow quickly, contaminate the toothbrush and ultimately make the brush unsanitary. Accordingly, there is a need for a solution to hygienically storing and drying a manual toothbrush which allows residual water, toothpaste slurry and saliva to drain off the brush. The brush is designed to dry quickly, which inhibits bacterial growth.

The material of the head piece can consist of a non-magnetic or non-ferromagnetic material, while the material of the handle can consist of a magnetic and / or ferromagnetic material. Magnetic / ferromagnetic material not only has a relatively high density and thus a relatively high weight, which gives the oral care device the aforementioned advantages, but the magnetic / ferromagnetic material also means that the oral care device can also be attached magnetically to a magnetic holder. The magnetic / ferromagnetic material of the handle can enable hygienic storage of the oral care device. When the oral care device is magnetically attached to a magnetic holder, any remaining water, toothpaste slurry, and saliva can drain off the brush. The oral care device can dry relatively quickly. As a result, bacterial growth can be significantly reduced, making the oral care device more hygienic. In contrast to an ordinary toothbrush, which is stored in a toothbrush cup, where drained liquids are caught and accumulated at the bottom of the cup, the brush of the present disclosure is exposed to wet conditions for a much shorter period of time.

For example, the magnetic holder can have the shape of a flat disk that can be attached to a wall. Such a flat disc can represent an easy-to-clean surface. Further, a user only needs to bring the oral care device close to the magnetic holder, and then the oral care device is automatically attached. There is no precise positioning or threading required as with ordinary toothbrush holders. Since the magnetic properties are only provided in the handle and not in the head piece, the head piece portion cannot be accidentally attached to the magnetic holder, thereby reducing the risk of the magnetic holder becoming dirty.

The magnetic and / or ferromagnetic material that forms at least part of the handle can comprise an amorphous thermoplastic resin. The magnetic and / or ferromagnetic material can furthermore comprise aluminum oxide, boron nitride or aluminum silicate. Furthermore, the magnetic and / or ferromagnetic material can additionally or as an alternative comprise iron oxide. The magnetic and / or ferromagnetic material can further comprise glass fibers, which can be premixed with at least a part of the amorphous thermoplastic resin. Such a handle material allows the weight of the handle to be controlled at any point, e.g. B. by varying the filler. Control of the entire toothbrush is required due to the relatively heavy weight of the handle. It is now possible to use the mass / weight distribution of the material to adjust the moment of inertia of the finished toothbrush.

The magnetic and / or ferromagnetic material can be from about 13 weight percent to about 30 weight percent an amorphous thermoplastic resin; from about 3 percent by weight to about 25 percent by weight alumina, boron nitride, or aluminum silicate; and from about 45 weight percent to about 67 weight percent iron oxide. Such a composition provides a density of material about three times the density of a standard plastic material used for toothbrushes, e.g. B. polypropylene. With its higher weight and higher thermal conductivity, the material promotes the perception of value, especially in combination with a galvanic coating. Such a coating can consist of real metal. The electroplating can be applied in a selective electroplating process. In this coating process for a multi-component plastic part, a metallic layer is only deposited on a hard material, while another overmolded soft component can remain unaffected.

The magnetic and / or ferromagnetic material can comprise about 27.5 percent by weight amorphous thermoplastic resin, about 17 percent by weight aluminum oxide, about 51 percent by weight iron oxide, and about 4.5% glass fiber.

The amorphous thermoplastic resin may be a styrene resin, e.g. B. styrene-acrylonitrile "SAN" include. The amorphous thermoplastic resin can be selected from the list consisting of acrylonitrile-butadiene-styrene, polystyrene and styrene-acrylonitrile.

The amorphous thermoplastic resin can comprise about 17 percent by weight styrene-acrylonitrile and 10.5 percent by weight of a mixture comprising polybutylene terephthalate and polyethylene terephthalate.

Surprisingly, it has been found that the composition provides a molding compound with high gravity which is suitable for injection molding or extrusion. A molding compound with high relative density is provided which has a high surface hardness, excellent coating properties and excellent thermal conductivity.

The use of molding compositions with a relatively high specific gravity is known. Such molding compounds usually contain a polymeric resin and a high density filler such as iron oxide. However, in such molding compositions, the amount of iron oxide that can be included is limited because the thermal conductivity properties of the molding composition are relatively poor. Thus, on the one hand, a lower thermal conductivity leads to relatively longer cycle times during production in order to allow the molding compound to cool down after molding. On the other hand, when heavy polymer materials are filled with highly thermally conductive additives such as metal powder or fibers, the addition of these materials leads to tight process windows during molding due to the immediate solidification when the melt comes into contact with the cold wall of the tool. This rapid solidification leads to a high injection speed and a low ratio of flow length to wall thickness on the manufactured part.

It has now surprisingly been found that the molding compound according to the present disclosure has a high relative density and optimally controlled thermal conductivity properties in order to reduce or lengthen the time required to cool the molding compound during or after injection molding. Surprisingly, it has been found that a relatively high percentage of iron oxide can be retained in the molding compound with a simultaneous improvement in the thermal conductivity properties of the molding compound. The addition of aluminum oxide, boron nitride or aluminum silicate gives the molding compound improved thermal conductivity compared to materials that only contain a styrene resin and iron oxide. This improved thermal conductivity can lead to lower cycle times because the molding compound needs less time to cool after molding.

Another advantage of adding alumina, boron nitride, or aluminosilicate to the material is the ability to increase the total amount of iron oxide in the molding compound compared to previous materials including iron oxide and resins. The improvements in the properties of the molding compound result from the addition of relatively small amounts of aluminum oxide, boron nitride or aluminum silicate. A composition of matter comprising a relatively high percentage of iron oxide (magnetite), ie from about 45 weight percent to about 67 weight percent, preferably about 51 weight percent, provides good magnetic properties and a relatively heavy weight of the entire material.

Styrene-acrylonitrile "SAN" provides high thermal resistance properties. The acrylonitrile units in the chain enable SAN to have a glass transition temperature of more than 100 ° C. The properties of SAN can allow for reduced cycle time due to a relatively earlier and faster transition temperature. Amorphous polymers are suitable for heavy resin compounds of the present disclosure because of the glass transition temperature Tg at which an amorphous polymer is reversibly converted from a viscous or rubbery state to a hard one. By injection molding the heavy resin material of the present disclosure, the temperature of the melted material is above the Tg range (viscous or rubbery state). When it cools down, the connection reaches the high Tg temperature early on and achieves dimensional stability (glass-like state). The heavy resin material can be overmolded because the material remains dimensionally stable due to the high Tg of the material.

Polybutylene terephthalate (PBT) and / or polyethylene terephthalate (PET) give the handle high quality surface properties, including improved optical properties and high impact resistance. After heating, a mixture of PBT and PET represents a high-temperature-resistant melt with a low viscosity and a high melt flow index (MFI). Therefore, the processability of the magnetic / ferromagnetic material during molding is improved.

It is known that heavy resin materials tend to show high shrinkage effects in products with thick walls / dimensions. However, it has surprisingly been found that glass fibers added to the magnetic / ferromagnetic material provide the material composition with improved stability and low shrinkage effects.

• - Bereitstellen eines amorphen thermoplastischen Harzes,
• - Bereitstellen von Aluminiumoxid, Bornitrid oder Aluminiumsilicat,
• - Bereitstellen von Eisenoxid,
• - Mischen des amorphen thermoplastischen Harzes, des Aluminiumoxids, Bornitrids oder Aluminiumsilicats und des Eisenoxids zu einer magnetischen und/oder ferromagnetischen Formmasse,
• - Erwärmen der Formmassenmischung zu einer fließfähigen Formmasse,
• - Formen der fließfähigen Formmischung zu einem Griff oder einem Teil eines Griffs,
• - Bereitstellen eines nicht magnetischen und/oder nicht ferromagnetischen Materials und Formen des nicht magnetischen und/oder nicht ferromagnetischen Materials zu einem Kopfstück oder einem Teil eines Kopfstücks.

A method of making an oral care device in accordance with the present disclosure includes the following steps:

• - providing an amorphous thermoplastic resin,
• - Provision of aluminum oxide, boron nitride or aluminum silicate,
• - Provision of iron oxide,
• - Mixing the amorphous thermoplastic resin, aluminum oxide, boron nitride or aluminum silicate and iron oxide to form a magnetic and / or ferromagnetic molding compound,
• - heating the molding compound mixture to form a flowable molding compound,
• - Shaping the flowable molding mixture into a handle or part of a handle,
• - Providing a non-magnetic and / or non-ferromagnetic material and shaping the non-magnetic and / or non-ferromagnetic material into a head piece or a part of a head piece.

The amorphous thermoplastic resin may include styrene-acrylonitrile, polybutylene terephthalate and polyethylene terephthalate, and polybutylene terephthalate and polyethylene terephthalate may be premixed with glass fibers. The amorphous thermoplastic resin can be provided in a range of about 13 weight percent to about 30 weight percent; the alumina, boron nitride, or aluminum silicate can be provided in a range of from about 3 percent to about 25 percent by weight; and the iron oxide can be provided in a range of from about 45 percent to about 67 percent by weight.

The magnetic and / or ferromagnetic material can be about 17 percent by weight styrene-acrylonitrile; about 10.5 percent by weight of a composition comprising polybutylene terephthalate and polyethylene terephthalate; about 4.5 weight percent glass fibers; about 17 weight percent alumina; and about 51 weight percent iron oxide.

The composition of matter can be prepared by mixing the amorphous thermoplastic resin with powder of alumina, boron nitride or aluminum silicate and with iron oxide powder. The Increasing the amount of iron oxide in the material composition also has the advantage that a more cost-effective molding compound is provided, since iron oxide powder is more cost-effective than the other fillers. Amorphous thermoplastic resin, glass fibers, alumina / boron nitride or aluminum silicate powder, and iron oxide powder can be mixed using a uniaxial extruder, a biaxial extruder, a kneader, a Banbury mixer, a roller, or other such extruders. After mixing, the material is heated to become flowable. The flowable material can then be formed into a handle or part of a handle by either injection molding or extrusion molding.

In an additional step, the handle or the part of the handle can be electroplated in order to contribute an improved appearance and a pleasant feeling. Thermoplastic elastomers are well suited for electroplating because they allow the manufacture of both hard and soft composite components for selective electroplating in one operation.

For example, the handle can comprise a thumb rest made from a thermoplastic elastomer material and / or from a polypropylene material. These materials can easily be injection molded over the heavy resin material as discussed above. Such a thumb rest can handle the oral care device with improved handling properties, e.g. With anti-slip properties, to improve the maneuverability of the oral care device in wet conditions, e.g. B. when the user brushes his teeth to improve. The thumb rest can be made of thermoplastic elastomer having a Shore A hardness of about 30 to about 60 or about 40 to prevent the oral care device from being too slippery when used in wet conditions. At least a portion of the thumb rest can have a concave shape with an angle α with respect to the area of the remaining portion of the thumb rest of about 20 ° to about 25 ° or about 24 °. The thumb rest or a grip area can be in the area near the proximal end, i.e. H. closest to the head piece, attached to the front surface of the handle. The thumb rest can include a plurality of ribs that extend substantially perpendicular to the longitudinal axis of the oral care device. Such ribs can enable users / consumers to use the oral care device with even more control. The user / consumer can better grasp and manipulate the handle of the oral care device while brushing. Such a handle can provide further improved control and comfort during cleaning, particularly in wet conditions.

Furthermore, the handle can be made from at least two or at least three different materials, each of which forms different parts of the handle. For example, a first material according to the present disclosure, e.g. B. a magnetic and / or ferromagnetic material, can be injection molded to a first component of the handle, whereby an underlying basic structure of the oral care device is formed. A second component, e.g. Polypropylene material, can be injection molded over the first component, and / or a third component, e.g. B. made of thermoplastic elastomer material, can be injection molded over the first component and / or the second component.

The third component of thermoplastic elastomeric material may form the thumb rest on the front surface of the oral care device and / or a palm grip on the back surface opposite the front surface for gripping by the fingers and thumb of the user / consumer. Such a handle configuration can even further withstand slipping during use. The thermoplastic elastomer material can extend through an opening provided in the underlying basic structure and / or the second component of the handle.

The dental cleaning elements of the oral care device, e.g. B. a bundle of filaments forming one or a plurality of tufts can be attached to the header by means of a hot tufting process. A method of manufacturing the head piece with tufts of filaments embedded in the head piece can comprise the following steps: In a first step, tufts are formed by providing a desired amount of filaments. In a second step, the tufts are placed in a mold cavity, so that the ends of the filaments that are to be attached to the head piece extend into the cavity. The opposite ends of the filaments that do not extend into the cavity can be either rounded or non-rounded. For example, the filaments may not have a rounded end if the filaments are tapered filaments with a pointed tip. In a third step, the head piece is formed around the ends of the filaments extending into the mold cavity by an injection molding process, whereby the tufts are anchored in the head piece. Alternatively, the tufts can be anchored by injection molding a first portion of the headpiece - a so-called "sealing plate" - around the ends of the filaments extending into the mold cavity prior to forming the remaining portion of the oral care device. Prior to the start of the injection molding process, the ends of the tufts that extend into the mold cavity can optionally be melted or fusion bonded to bond the filaments together into a molten mass or sphere so that the molten masses or spheres are within the cavity. The tufts can be held in the mold cavity by a molding rod with blind holes which correspond to the desired position of the tufts on the finished head piece of the oral care device. In other words, the tufts fastened to the head piece by means of a hot tufting process are not folded over a central section along their length and are not fastened in the head piece by means of an anchor / clamp. The tufts are attached to the headpiece using an anchor-free tufting process.

As an alternative, the head piece for the oral care device can have a bristle carrier with at least one tuft hole, e.g. B. a blind hole provided. A tuft comprising a plurality of filaments can be fixed / anchored in the tuft hole by a stapling / anchor tufting method. This means that the filaments of the tuft are essentially U-shaped around an anchor, e.g. B. an anchor wire or an anchor plate, for example made of metal, bent / folded. The filaments are pressed together with the anchor into the tuft hole so that the anchor penetrates into opposite side walls of the tuft hole, whereby the filaments are anchored / fixed / fastened to the bristle carrier. The anchor can be fixed positively and frictionally in opposite side walls. If the tuft hole is a blind hole, the anchor holds the filaments against a bottom of the hole. In other words, the anchor can lie essentially perpendicularly above the U-shaped bend. Because the filaments of the tuft are bent in a substantially U-shaped configuration around the anchor, a first leg and a second leg of each filament extend from the bristle carrier in a filamentary direction. Filament types that can / are suitable for use in a tacking process are also referred to as "double-sided filaments". Oral care device heads made by a stapling process can be provided in a relatively inexpensive and time efficient manner.

The following is a non-limiting discussion of exemplary embodiments of oral care devices and parts thereof in accordance with the present disclosure, reference being made to the figures.

1 shows an oral care device 10 , in this specific embodiment a manual toothbrush 10 , taking the manual toothbrush 10 a handle 12 and a head piece 14th that repeats on the handle 12 is attachable and detachable therefrom includes. The oral care device 10 has a front 11 and a back 13 on. A total length expansion 15th extends between a proximal end 17th and a distal end 19th the device 10 (see. 2 ). Tooth cleaning items 21st are on the head piece 14th attached and extend from the front 11 . The handle 12 can be formed using the method as in the flow chart of FIG 3 and as further explained below. The handle 12 can be formed from a magnetic and / or ferromagnetic material. Also, the handle can 12 electroplating with any additional material, for example a polyethylene material or a thermoplastic elastomer, to give a soft area, e.g. B. a thumb rest 16 to manufacture. The soft area / thumb rest 16 can increase the comfort and feel of the handle 12 improve. As an alternative or in addition, the handle 12 directly on the magnetic and / or ferromagnetic material of the present disclosure with a metal layer 18th provided to the appearance of the handle 12 to improve further. For example, the metal layer 18th have the shape of a ring surrounding the outer circumference 20th of the handle 12 surrounds.

The material that makes up the handle 12 is at least partially produced, has magnetic and / or ferromagnetic properties. 2 shows a set 22nd , comprising a manual toothbrush 10 with handle 12 on which the head piece 14th attached, and a magnetic holder 24 on which the toothbrush 10 is magnetically attached.

3 Figure 12 is a graphical representation of a flow chart showing the steps of making a handle 12 or a portion of a handle of the oral care device 10 illustrated in accordance with the present disclosure. An amorphous thermoplastic resin, optionally comprising glass fibers, is used in 100 provided. Aluminum oxide, boron nitride or aluminum silicate is used in 110 provided. Iron oxide is used in 120 provided. At 130 the amorphous thermoplastic resin (optionally comprising glass fibers), the aluminum oxide, boron nitride or aluminum silicate and the iron oxide are mixed to form a molding compound. The molding compound is then at 140 heated to a flowable state. The heated and flowable molding compound is at 150 to a handle 12 or part of a handle. The molding step can be either a Be an injection molding or an extrusion step. The optional step of electroplating the oral care device / handle is at 160 shown.

The material according to the present disclosure is an alternative to metal / zinc die cast material. The material of the disclosure makes it possible to offer an attractive solution in terms of the manufacturing method according to the present disclosure, the price and the environment. This alternative enables the finished handle to have the appearance and feel of a metal product. At the same time, the material of the present invention should be easy to process by injection molding and save assembly costs. For example, the method of the present disclosure requires three basic steps: (1) Injection molding of the handle 12 ; (2) Two-component injection molding of hard material and / or soft material, e.g. B. a thumb rest 16 to build; and (3) electroplating the handle, e.g. B. a metal layer in the form of a ring 18th to build. In contrast, if a zinc die-cast material is used, five steps are required: (1) making the zinc die-cast body; (2) deburring the main part; (3) electroplating the main part; (4) separately manufacturing a soft material part; (5) and joining the main part with the separately manufactured soft material part. A lubricant can be added to the material to improve flowability during mold processing.

Table 1 shows the flowability and heat transfer results of several different formulations / material compositions: Table 1: Flowability and heat transfer Test no. 20% SAN 20% SAN 15% SAN 17% SAN 80% iron oxide 5% alumina 10% alumina 16% alumina 75% iron oxide 75% iron oxide 67% iron oxide Specific weight [g / cm ³ ] 2.91 2.95 2.99 3.06 1 21st 16 13 9 2 20th 16 13 9 3 20th 16 13 10 4th 21st 16 13 9 5 20th 16 14th 9 6th 20th 16 13 8th 7th 20th 16 13 9 8th 20th 16 13 9 9 20th 16 13 9 10 20th 16 13 9 Diameter (cm) 20.2 16 13.1 9 Al-Ox content [%] 0 5 10 16 Heat transfer rate 0.87 0.96 1.2 1.43 [W / m * K] 0.89 1.06 1.22 1.41 0.88 1.01 1.23 1.44 Average value [W / m * K] 0.88 1.01 1.21666667 1.42666667

Graph 1 shows the average results of heat transfer and flow distance of the formulations / material compositions from Table 1.

As can be seen, different fillers and different concentrations of fillers control the thermal conductivity or heat transfer and fluidity of the material.

The test results indicated that the use of boron nitride or aluminum silicate gave results very similar to those of alumina shown in Table 1 and Graph 1 above.

The thermal energy and shear heating affect the flowability of the heavy resin material, and thereby the process window for an efficient injection molding process can be precisely controlled. Further, with the ability of the material of the present disclosure to fill any available voids within the mold, it is possible to use the mass / weight distribution of the material to adjust the moment of inertia / center of gravity of the finished handle.

The material of the present disclosure provides several advantages: The handle made with the material of the present invention looks and feels like a heavy metal handle and is corrosion resistant. Due to its heat transfer properties, the material also has manufacturing advantages and cost saving advantages with fast cycle times compared to inlaid or die-cast metal handles and products with assembled components. The material of the present disclosure requires less energy and other essential resources to manufacture compared to die-cast zinc products.

In contrast to material compositions heavily loaded with fillers, the magnetic / ferromagnetic material of the present disclosure shows optimized mechanical properties, in particular heat resistance and impact resistance, due to the improved melt viscosity and glass transition temperature.

The material of the present disclosure has the ability to be applied to other components / materials, e.g. Substrates and resins, which is important for multi-component injection molding, e.g. B. for the shaping of handles that comprise two or three different materials.

• „Kraftgriff“ 200, 210: selten verwendet; Finger umschließen eng den Griff; der Daumen wird meist gestreckt oder umschließt eng den Griff; von Verbrauchern verwendet, die denken „mehr Druck reinigt besser“, oder als einer von mehreren sich ändernden Stilen während des Putzens für Bereiche, in denen Verbraucher eine bessere Kontrolle benötigen, z. B. an den hinteren Molaren oder an inneren Zahnoberflächen. Manche Verbraucher halten den Griff am unteren Ende, um den Druck zu reduzieren. Auch von den meisten Kindern verwendet, wenn sie beginnen, selbst zu putzen.
• „Schräggriff“ 220, 230: sehr häufig verwendet; das Griffgewicht ist locker in der Handfläche platziert; der Daumen ist relativ zum Zeigefinger ausgestreckt; ermöglicht einen guten Griff und eine gute Navigation ähnlich dem Schneiden mit einem Messer. Am häufigsten zum Putzen verwendet, da dies ein üblicher Stil ist, der mehrmals täglich in verschiedenen Situationen angewendet wird, z. B. Essen, Haarkämmen, Kehrbürsten. In den meisten Fällen wenden Verbraucher, die diesen Stil verwenden, die Schrubbtechnik (d. h. eine Hin- und Herbewegung) an, um ihre Zähne zu reinigen.
• „Distaler Schräggriff“ 240, 250: sehr häufig verwendet; das Griffgewicht ist locker in der Handfläche platziert; Daumen und Ringfinger liegen einander gegenüber; ermöglicht einen guten Griff und eine gute Navigation ähnlich dem Schneiden mit einem Messer. Ebenfalls häufig zum Putzen verwendet, da dies ein üblicher Stil ist, der mehrmals täglich in verschiedenen Situationen angewendet wird, z. B. Essen, Haarkämmen, Kehrbürsten. In den meisten Fällen wenden Verbraucher, die diesen Stil verwenden, die Schrubbtechnik (d. h. eine Hin- und Herbewegung) an, um ihre Zähne zu reinigen.
• „Präzisionsgriff“ 260, 270: selten verwendet; Gewicht des Griffs hauptsächlich auf Fingerspitzen; Daumen und Zeigefinger liegen einander gegenüber; da es sich hierbei um einen drucklosen Stil handelt, wird er häufig für schwer erreichbare oder empfindliche Bereiche, z. B. an den inneren Zahnoberflächen, verwendet. Oft beobachtet als Übergangsgriff zu „Distal schräg“ oder „Schräg“, jedoch verwenden einige Verbraucher ihn als ihren „einzigen Griffstil“.
• „Löffelgriff“ 280, 290: häufig in Essstäbchenbereichen verwendet; Zeigefinger und Daumen liegen einander gegenüber, wodurch der Griff fest gehalten wird. Basierend auf Verbrauchergewohnheiten, d. h. der Stil „Essstäbchen“ ist in Asien sehr verbreitet; sehr vertraut, da er häufig für andere Zwecke verwendet wird; wird ähnlich wie der „Präzisionsstil“ als sanfte Möglichkeit zum Reinigen schwer erreichbarer oder empfindlicher Bereiche verwendet.

4th shows five different grip styles / ways in which users usually hold a toothbrush while brushing their teeth: "Power grip" 200 , 210 , "Angled handle" 220 , 230 , "Distal angled handle" 240 , 250 , "Precision handle" 260 , 270 and "spoon handle" 280 , 290 . In the left column are the different grip styles 200 , 220 , 240 , 260 , 280 shown when a user is using a toothbrush 320 , 1000 according to the state of the art (cf. 5 , 6th , 7th , 8th and 9 ), while in the right column the respective grip styles 210 , 230 , 250 , 270 , 290 shown when a user is using an oral care device 10 , 300 , 310 (see. 5 , 6th , 7th and 10 ) according to the present disclosure. The center of gravity is indicated with "X". The grip styles can be defined by the following properties:

• "Power grip" 200 , 210 : rarely used; Fingers tightly encircle the handle; the thumb is usually stretched or tightly wrapped around the handle; Used by consumers who think "more pressure cleans better" or as one of several changing styles of brushing for areas where consumers need better control, e.g. B. on the rear molars or on inner tooth surfaces. Some consumers hold the handle at the bottom to relieve pressure. Also used by most children when they start brushing themselves.
• "Angled handle" 220 , 230 : used very often; the handle weight is loosely placed in the palm of the hand; the thumb is extended relative to the index finger; allows a good grip and navigation similar to cutting with a knife. Most commonly used for brushing as this is a common style used several times a day in different situations, e.g. B. Food, hair combs, sweeping brushes. For the most part, consumers using this style will use the scrubbing technique (i.e. a reciprocating motion) to clean their teeth.
• "Distal angled handle" 240 , 250 : used very often; the handle weight is loosely placed in the palm of the hand; Thumb and ring finger are opposite each other; allows a good grip and navigation similar to cutting with a knife. Also widely used for brushing as this is a common style used several times a day in different situations, e.g. B. Food, hair combs, sweeping brushes. For the most part, consumers using this style will use the scrubbing technique (i.e. a reciprocating motion) to clean their teeth.
• "Precision handle" 260 , 270 : rarely used; Handle weight mainly on fingertips; Thumb and forefinger are opposite each other; since this is a pressureless style, it is often used for hard-to-reach or sensitive areas, such as the bathroom. B. on the inner tooth surfaces used. Often observed as a transition grip to "distal sloping" or "sloping", however, some consumers use it as their "only grip style".
• "Spoon handle" 280 , 290 : often used in chopstick areas; The index finger and thumb are opposite each other, which holds the handle firmly. Based on consumer habits, ie the “chopstick” style is very common in Asia; very familiar as it is often used for other purposes; Similar to the “Precision Style”, it is used as a gentle way to clean hard-to-reach or sensitive areas.

How out 4th derivable, the center of gravity X of the toothbrush according to the present disclosure is displaced closer to the center of the longitudinal extent of the toothbrush handle compared to the toothbrush according to the prior art, even if the toothbrush head piece is loaded with toothpaste. Since the center of gravity is near the middle of the length of the handle, the toothbrush is better balanced and does not tip over / become top heavy once pasta is applied to the brush head. Furthermore, as in 4th shown, the center of gravity at or very close to the pivot point of the wrist for all different grip styles. A balanced toothbrush is easier to control in the mouth and allows precise and precise brushing movements, which enables better cleaning of the teeth.

5 shows three toothbrushes 300 , 310 , 320 that with the exception of the handle material 600 , 610 , 620 are identical. 6th shows the toothbrushes 300 , 310 , 320 from 5 , but with toothpaste 400 loaded. The material compositions and properties of the toothbrushes 300 , 310 , 320 are listed in Table 2: Table 2: Material compositions and properties Fig. brush Total mass [g] Head piece material / density [g / cm ³ ] Handle material Handle material density [g / cm ³ ] 5 300 48.7 Polypropylene / 0.9 15 wt% styrene-acrylonitrile 3.0 10 wt% alumina 75 wt% iron oxide Or as an alternative: 17% by weight styrene-acrylonitrile 16 wt% alumina 67 wt% iron oxide 6th 300 50.2 Polypropylene / 0.9 15 wt% styrene-acrylonitrile 3.0 10 wt% alumina 75 wt% iron oxide Or as an alternative: 17% by weight styrene-acrylonitrile 16 wt% alumina 67 wt% iron oxide 5 310 41.7 Polypropylene / 0.9 17% by weight styrene-acrylonitrile 2.5 10.5 wt% BPT and PET 4.5% glass fiber 17 wt% alumina 51 wt% iron oxide 6th 310 43.2 Polypropylene / 0.9 17% by weight styrene-acrylonitrile 2.5 10.5 wt% BPT and PET 4.5% glass fiber 17 wt% alumina 51 wt% iron oxide 5 320 19.3 Polypropylene / 0.9 Polypropylene 0.9 6th 320 20.7 Polypropylene / 0.9 Polypropylene 0.9

The focus of the toothbrushes 300 , 310 , 320 is with 500 , 510 or. 520 designated. As in 5 and 6th are the focus 500 the brush 300 and the focus 510 the brush 310 (according to the present disclosure) compared to the center of gravity 520 the brush 320 (according to the prior art) closer to the center of the longitudinal extension of the toothbrush handle. The toothbrushes 300 and 310 are easier to control in the mouth and allow more precise and precise cleaning movements.

In 7th becomes the toothbrush 310 (with and without toothpaste) with a toothbrush 320 (with and without toothpaste) compared. How out 7th clearly deducible, the focus is 510 closer to the center of the handle's extension than the center of gravity 520 the toothbrush 320 . The focus 510 the toothbrush 310 is about the distance 700 postponed.

Furthermore, the toothbrush 310 , as in 7th shown, a total length expansion 720 on. The focus 510 is in the distance 740 measured from the distal end 760 of the handle 610 , arranged. The ratio of the distance 740 of focus 510 measured from the distal end 760 , to the total length expansion 720 the oral care device 310 can be from about 0.30 to about 0.45, or from about 0.35 to about 0.42, or from about 0.38 to about 0.41. Such a relationship provides a toothbrush with a center of gravity close to the pivot point of the wrist during brushing. When using the in 4th The handle styles shown make the toothbrush easier to control in the mouth, which enables more precise and precise brushing movements.

The total length expansion 720 the oral care device 310 can be from about 180 mm to about 220 mm or about 200 mm while the handle 610 the oral care device 310 a linear expansion 780 from about 120 mm to about 140 mm or from about 125 mm to about 131 mm or about 130 mm. The focus 510 (if the oral care device 310 loaded with 1.4 g toothpaste) is at about 83 mm measured from the distal end 760 of the handle 610 , arranged.

In contrast to the toothbrush 310 instructs the toothbrush 320 (according to the state of the art) a focus 520 at a distance of about 194 mm as measured from the distal end 690 , is arranged (if the toothbrush 320 loaded with about 1.4 g of toothpaste). The focus 510 the toothbrush 310 is 111 mm to the distal end 760 of the handle 610 shifted towards (compared to the toothbrush 320 ).

The 8th and 9 show the axis of rotation in front view and side view 1100 and focus 1200 the toothbrush 1000 According to the state of the art. The toothbrush 1000 includes a handle 1010 made of polypropylene with a density of about 0.9 g / cm ³ . The toothbrush 1000 is loaded with approximately 1.4 g of toothpaste and placed on a substantially flat surface 517 placed. How out 8th derivable, the focus is 1200 above the axis of rotation 1100 , and so is the toothbrush 100 in an unstable / unbalanced position. To prevent the toothbrush 1000 tilts / turns to the side when the brush 1000 is moved out of the balanced position, there are additional geometric structures in the form of roller stops 1300 provided.

In contrast to the toothbrushes of the prior art with a light grip, the toothbrush has 310 a focus in accordance with the present disclosure 510 on, which is below the axis of rotation 515 located when the brush is loaded with approximately 1.4 grams of toothpaste and on a substantially flat / flat surface 517 is placed (cf. 10 ). Because the focus 510 when measuring along the height extension 23 of the handle 610 closer to the back 13 than at the front 11 the toothbrush 310 the toothbrush reverses 310 automatically returns to an upright position (as in 10 shown) and holds the toothpaste 400 from the surface 517 away as soon as the brush 310 is moved out of the balanced position.

In the context of this disclosure, the term “substantially” refers to an arrangement of elements or features which, while in theory would be expected to have an exact match or behavior, in practice may embody something that is slightly less than is exact. Thus, the term denotes the degree to which a quantitative value, a quantitative measurement or another related representation can deviate from a stated reference value without leading to a change in the basic function of the object in question.

The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values given. Instead, unless otherwise specified, each such dimension is intended to mean both the stated value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40mm” is intended to mean “about 40mm”.

Claims (11)

Oral care device (10, 300, 310) with an overall length extension (15, 720) extending between a proximal end (17) and a distal end (19, 760), the distal end (19,760) being the proximal end (17) opposite, wherein the oral care device (10, 300, 310) comprises a head piece (14) at the proximal end (17) and a handle (12, 600, 610), the handle (12, 600, 610) at least partially from a Material is made with a density that is higher than the density of the material of the head piece (14), wherein the oral care device (10, 300, 310) has a center of gravity (500, 510) at a distance (740) measured from the distal end (19, 760), the headpiece being repeatedly attachable to and detachable from the handle Oral care device (10, 300, 310) according to Claim 1 wherein the oral care device (10, 300, 310) has a center of gravity (500, 510) which is arranged at a distance (740) measured from the distal end (19, 760), the ratio of the distance (740) to the total length extension (15, 720) of the oral care device (10, 300, 310) from about 0.30 to about 0.45, preferably from about 0.35 to about 0.42, more preferably from about 0.38 to about 0 .41 is. Oral care device (10, 300, 310) according to one of the preceding claims, wherein the total length extension (15, 720) of the oral care device (10, 300, 310) is from about 180 mm to about 220 mm, preferably about 200 mm. Oral care device (10, 300, 310) according to one of the preceding claims, wherein the oral care device (10, 300, 310) has a front side (11) and a back side (13) opposite the front side (11) and the head piece (14) has at least one Has cleaning element (21) extending from the front (11), and the handle (12, 600, 610) has a cross-sectional area which extends substantially extends perpendicular to the overall length dimension (15, 720) of the oral care device (10, 300, 310), the cross-sectional area has a height dimension (23) that extends between the front (11) and the rear (13), and the oral care device (10 , 300, 310) has an axis of rotation (515) when the oral care device (10, 300, 310) is placed with the rear side (13) on a surface (517), and the center of gravity (500, 510) when measured along the height extension (23) of the handle (12, 600, 610) below the axis of rotation (515) and closer to the rear (13) than to the front (11). Oral care device (10, 300, 310) according to one of the preceding claims, wherein the head piece (14) is at least partially made of a material with a density of about 0.5 g / cm ³ to about 1.2 g / cm ³ , preferably of about 0.7 g / cm ³ to about 1.0 g / cm ³ , more preferably about 0.9 g / cm ³ , and / or the handle (12, 600, 610) is at least partially made of a material with a density of about 2.1 g / cm ³ to about 3.1 g / cm ³ , preferably from about 2.3 g / cm ³ to about 2.8 g / cm ³ , more preferably from about 2.5 g / cm ³ to about 2.7 g / cm ^{3 is} made. Oral care device (10, 300, 310) according to one of the preceding claims, wherein the material of the head piece (14) is a non-magnetic and / or non-ferromagnetic material, preferably polypropylene; and the material of the handle (12, 600, 610) comprises a magnetic and / or ferromagnetic material and the magnetic and / or ferromagnetic material of the handle (12, 600, 610) comprises amorphous thermoplastic resin; Iron oxide; and comprises alumina, boron nitride or aluminum silicate. Oral care device (10, 300, 310) according to Claim 6 wherein the magnetic and / or ferromagnetic material of the handle (12, 600, 610) is from about 13 weight percent to about 30 weight percent an amorphous thermoplastic resin; from about 3 percent by weight to about 25 percent by weight alumina, boron nitride, or aluminum silicate; and from about 45 weight percent to about 67 weight percent iron oxide. Oral care device (10, 300, 310) according to Claim 6 or 7th wherein the amorphous thermoplastic resin is selected from the group consisting of: acrylonitrile-butadiene-styrene, polystyrene and styrene-acrylonitrile. Oral care device (10, 300, 310) according to one of the Claims 6 to 8th wherein the magnetic and / or ferromagnetic material comprises about 27.5 percent by weight amorphous thermoplastic resin, about 17 percent by weight aluminum oxide, about 51 percent by weight iron oxide and about 4.5% glass fiber. Oral care device (10, 300, 310) according to one of the Claims 6 to 9 wherein the amorphous thermoplastic resin comprises about 17 percent by weight styrene-acrylonitrile and 10.5 percent by weight of a mixture comprising polybutylene terephthalate and polyethylene terephthalate. Set (22) comprising the oral care device (10, 300, 310) according to one of the preceding claims and a magnetic holder (24) for attaching and holding the oral care device (10, 300, 310).

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