DEVICE FOR THE CLEANING OF MESIAL AND DISTAL SURFACES OF TEETH AND FIXED PROSTHESIS

Abstract

A toothbrush product for cleaning an exposed mesial or distal surface of a tooth or tooth prosthesis comprising: an elongate member comprising a forward end and a backward end, wherein the elongate member comprises a handle portion and the elongate member extends in a longitudinal direction from the forward end to the backward end; a brush head, wherein the brush head comprises a plurality of tufts provided at a forward and/or a backward surface of the brush head and at least one support memberfor the brush head disposed at the forward end of the elongate member wherein the at least one support member is shaped to support the brush head at a transverse distance from the elongate member, wherein the at least one support member comprises a proximal portion and a distal portion to provide a void between the forward end and the brush head.

Claims

1. A toothbrush product for cleaning an exposed mesial or distal surface of a tooth or tooth prosthesis comprising: an elongate member comprising a forward end and a backward end, wherein the elongate member comprises a handle portion and the elongate member extends in a longitudinal direction from the forward end to the backward end; a brush head, wherein the brush head comprises a plurality of tufts provided at a forward and/or a backward surface of the brush head and at least one support member for the brush head disposed at the forward end of the elongate member wherein the at least one support member is shaped to support the brush head at a transverse distance from the elongate member, wherein the at least one support member comprises a proximal portion extending laterally and a distal portion extending transversely thereby to provide a void between the forward end of the elongate member and the brush head across said transverse distance and wherein at least part of the support member extends away from the forward end of the elongate member in the transverse direction such that the void is provided in a substantially transverse plane.

2. A toothbrush product as claimed in claim 1, wherein the at least one support member and brush head comprises a hook or a loop profile.

3. A toothbrush product as claimed in claim 1, further comprising a shoulder coupling between the elongate member and the at least one support member.

4. A toothbrush product as claimed in claim 1, wherein the shoulder coupling couples the elongate portion and the at least one support member such that the at least one support member is projected from the elongate member in a transverse direction at an angle in the range between 15 degrees and 250 degrees, preferably between 80 degrees and 120 degrees.

5. A toothbrush product as claimed in claim 1, wherein the at least one support member comprises a curved profile in the lateral direction and/or a curved profile in the transverse direction.

6. A toothbrush product as claimed in claim 1, wherein the curved profile in the transverse direction and in the lateral direction may be selected to correspond to a curved profile of a tooth or tooth prosthesis, for example a tooth or tooth prosthesis.

7. A toothbrush product as claimed in claim 1, wherein the distal portion of the at least one support member may curve either towards or away from the handle portion.

8. A toothbrush product as claimed in claim 1, wherein the at least one support member comprises a first support member and a second support member disposed on opposing sides of the elongate member and wherein the brush head spans the distance between distal portions of the first and second support members such that at least part of the elongate member, the brush head and the first and second support members form a closed loop.

9. A toothbrush product as claimed in claim 1 further comprising a forward portion disposed between the handle portion and the support member wherein the forward portion is inclined and/or curved relative to the handle portion.

10. A toothbrush product as claimed in claim 1, wherein the brush head extends laterally from the distal end of the support member and comprises a profile that is at least one of a: curved, concave, convex, tear-drop, arched, flat, straight.

11. A toothbrush product as claimed in claim 1, wherein the plurality of tufts are arranged such that the free ends of the tufts comprise a curved and/or inclined and/or vertical side profile.

12. A toothbrush product as claimed in claim 1, wherein the plurality of tufts are arranged such that tufts provided towards the centre of the brush head are smaller in length relative to tufts provided at either end of the brush head.

13. A toothbrush product as claimed in claim 1, wherein the plurality of tufts are arranged such that the tufts at the most transverse part of the brush head extend further from the brush head surface than tufts provided at the least transverse part of the brush head.

14. A toothbrush product as claimed in claim 1, comprising a first plurality of tufts on the forward surface of the brush head and a second plurality of tufts on the backward surface of the brush head.

15. A toothbrush product as claimed in claim 14, wherein the first plurality of tufts are aligned along a first tuft axis and the second plurality of tufts are aligned along a second tuft axis and the angle between the first tuft axis and the second tuft axis may be in the range from 30 degrees to 280 degrees, preferably in the range 90 degrees to 180 degrees.

16-18. (canceled)

19. A toothbrush product as claimed in claim 1, wherein the elongate member and/or the brush head and/or the at least one support member is manufactured out of at least one of: a biodegradable material, plastic, bamboo, an elastomer, elastomer coated and/or bristles of the plurality of tufts comprise any suitable material, for example, elastomer and/or nylon and/or a microbial material and/or wherein the tufts comprise a material that is plaque repellent and/or wherein the tufts are replaceable.

20. A brush head assembly configured to be coupled to an elongate member comprising a handle portion, wherein the brush head assembly comprises: a brush head comprising a plurality of tufts provided at a forward and/or a backward surface of the brush head and at least one support member for the brush head and a brush head assembly coupling for coupling the at least one support member to an elongate member comprising a handle portion, wherein the at least one support member is shaped to provide the brush head at a distance from the brush head assembly coupling and wherein the at least one support member comprises a proximal portion extending laterally and a distal portion extending transversely from the brush head assembly coupling, such that a void is provided between the brush head assembly coupling and the brush head across said distance.

21. The brush head assembly as claimed in claim 20, wherein the brush head assembly is configured to be coupled to an electric toothbrush.

22. A kit of parts comprising: the brush head assembly according to claim 20 and the elongate member.

23. A kit of parts as claimed in claim 22, wherein the brush head assembly comprises a first mating feature at the brush head assembly coupling and the elongate member comprise a second corresponding mating feature configured to mate to the first mating feature.

24-25. (canceled)

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0127] Various aspects of the invention will now be described by way of example only, and with reference to the accompanying drawings, of which:

[0128] FIGS. ’s1A-1E are front, left and right elevational, and top and bottom plan views of an embodiment of the device which enables the user to clean mesial tooth surfaces

[0129] FIG. 1F shows the cross-section of one example of a brush head

[0130] FIG. 1G is a top plan view of an embodiment of the device while in use to clean a mesial tooth surface

[0131] FIG. 1H is a right elevational view of an embodiment of the device while in use to clean a mesial tooth surface

[0132] FIG. 1I is a right elevational view of an embodiment of the device while in use to clean a mesial surface of a tipped tooth which has suffered periodontal recession

[0133] FIG. 2 shows the typical directions of a user’s forces which seat cleaning devices being used for the mesial or distal aspects of teeth

[0134] FIG. 3 shows the typical cleaning motion which oscillates buccally and lingually employed with a device being used for the cleaning of mesial or distal aspects of teeth

[0135] FIGS. ’s4A-4E are front, left and right elevational, and top and bottom plan views of an embodiment of the device which enables the user to clean distal tooth surfaces

[0136] FIG. 4F is a top plan view of an embodiment of the device while in use to clean a distal tooth surface

[0137] FIG. 4G is a right elevational view of an embodiment of the device while in use to clean a distal tooth surface

[0138] FIG. 5A is a perspective view of an embodiment of the device which allows the user to clean both mesial and distal surfaces of teeth

[0139] FIG. 5B is a top plan view of an embodiment of the device which allows the user to clean both mesial and distal surfaces of teeth

[0140] FIG. 5C is right elevational view of an embodiment of the device which allows the user to clean both mesial and distal surfaces of teeth

[0141] FIG. 6A is right elevational view of an embodiment of the device which allows the user to clean both mesial and distal surfaces of teeth

[0142] FIG. 6B is a bottom plan view of an embodiment of the device which allows the user to clean both mesial and distal surfaces of teeth

[0143] FIG. 6C shows the cross-sectional view of the brush head of an embodiment of the device which allows the user to clean both mesial and distal surfaces of teeth

[0144] FIG. 6D is a front elevational view of an embodiment of the device which allows the user to clean both mesial and distal surfaces of teeth and incorporates a brush head shaped in the form of a single curve

[0145] FIG. 6E is a front elevational view of an embodiment of the device which allows the user to clean both mesial and distal surfaces of teeth and incorporates a brush head shaped in the form of two flat areas at the ends of the head and an area shaped with compound curves in the centre

[0146] FIG. 7 is a front elevational view of an embodiment of the device which allows the user to clean mesial surfaces of teeth and incorporates a brush head shaped in the form of a single curve

[0147] FIG. 8 is a front elevational view of an embodiment of the device which allows the user to clean mesial surfaces of teeth and incorporates a brush head shaped in the form of two flat areas at the ends of the head and an area shaped with compound curves in the centre

[0148] FIG. 9 is a front elevational view of an embodiment of the device which allows the user to clean mesial surfaces of teeth and incorporates a straight-edged brush head with bristles arranged along a straight edge

[0149] FIG. 10 is a front elevational view of an embodiment of the device which allows the user to clean mesial surfaces of teeth and incorporates a straight-edged brush head with bristle tips arranged along a compound curve in the centre region and along a straight edge at the ends

[0150] FIG. 11 shows the relative angles between components in an embodiment of the device which allows the user to clean mesial surfaces of teeth

[0151] FIG. 12 shows the functional curves within the forms of the secondary members

[0152] FIGS. ’s. 13A-13D show front and right elevational views of the separate handle and brush head assembly of an embodiment of the device which allows the user to clean mesial or distal surfaces of teeth and incorporates a brush head shaped in the form of two flat areas at the ends of the head and an area shaped with compound curves in the centre

[0153] FIG. 13E shows the components in FIGS. ’s. 13A-13D joined to form an embodiment of the device which allows the user to clean mesial surfaces of teeth

[0154] FIG. 13F shows the components in FIGS. ’s. 13A-13D joined to form an embodiment of the device which allows the user to clean distal surfaces of teeth

[0155] FIGS. 14A to C show a toothbrush device having a single support member and a plurality of tufts provided on a forward surface of a brush head member, in accordance with a further embodiment

[0156] FIGS. 15A to C show a toothbrush device having a single support member and a plurality of tufts provided on a backward surface of a brush head member, in accordance with a further embodiment

[0157] FIGS. 16A to C show a toothbrush device having a single support member and a first plurality of tufts provided on a forward surface of a brush head member and a second plurality of tufts provided on a backward surface of the brush head member, in accordance with a further embodiment

DETAILED DESCRIPTION OF THE DRAWINGS

[0158] The device described in the following may allow the user to overcome the common difficulties in plaque removal from the mesial or distal surfaces of teeth or fixed prostheses which lie adjacent to spacing within the dental arch. The device may obviate the need for high manual dexterity and overcomes other limitations encountered when using devices in the prior art for this purpose.

[0159] Due to patients’ tendencies to maintain rigidity in the wrist and fingers during tooth cleaning, the arm is usually employed to create the oscillating or reciprocating cleaning action. Due to the length of the arm, this translates to an almost linear action 28 (of FIG. 3) in the oral cavity. This is problematic when trying to clean along the small compound curves of any single tooth which could be anywhere on the upper or lower jaws.

[0160] The user’s linear action which oscillates between the buccal and lingual aspects of the tooth FIG. 3 is very reproducible and ideally should translate into effective cleaning due to the merits of the toothbrush structure. The most reproducible force which seats and places the brush in the required position 27 for solving the problem is directed into the junction between the tooth and gingiva at the mesial or distal aspect and the toothbrush structure should allow the user to make efficient use of it to maintain the brush head’s appropriate position. The toothbrush should also offer tactile feedback to the user throughout the cleaning motions to confirm and reinforce the correctness of their technique. This will develop a reproducible and effective technique.

[0161] In the following various embodiments of a toothbrush product are described. A handle 20 is shaped to allow fingers to resist the adverse torqueing moment around its longitudinal axis generated by friction while the device is in use thereby maintaining its optimal orientation, for example, and not limited to, as depicted in FIGS. ’s1A-13F. In some embodiments, the handle has dimensions which help prevent excessive application of grip and strength by the user.

[0162] In preferred embodiments, at its distal end, the handle 20 merges with a first member 22 which may be straight or curved. The first member 22 and the handle 20 may also form a single elongate member that has a forward end and a backward end. The first member 22 may be referred to as forward portion of the elongate member and the handle 20 may be referred to as a handle portion of the elongate member. The elongate member extends in a longitudinal direction from the forward end to the backward end such that the elongate member has a length in the longitudinal direction. In preferred embodiments, at the distal end of the first member 22 may be two additional bifurcating secondary members 40. The secondary members 40 may also be referred to as support members. The secondary member 40 provide support for the brush head. The secondary members 40 are disposed or provided at the forward end of the elongate member i.e. the secondary members 40 are provided at the end of the first member 22.

[0163] In preferred embodiments, the secondary members 40 serve to support a brush head 50 which spans their distal ends. The secondary members 40 are provided at the forward end of the first member 22 and are shaped to support the brush head 50 at a transverse distance from the first member 22. As depicted in FIG. 1, the brush head 50 is supported at a transverse distance from the forward end of the elongate member i.e. in a direction that is considered substantially perpendicular or normal to the longitudinal direction of the elongate member. The secondary members 22 are provided at opposing sides of the elongate member and are provided in a substantially parallel arrangement.

[0164] In use, when the toothbrush is provided at a cleaning position, the transverse distance is along an inferior-superior axis of the mouth. In the cleaning position the transverse distance is substantially parallel to a coronoapical axis e.g. parallel to the long axis of the tooth or tooth prosthesis being cleaned. In the cleaning position at least part of the tooth or tooth prosthesis being cleaned may be present in the void.

[0165] In some embodiments, each of the pair of secondary members 40 mirror each other. A first secondary member of the pair is described in the following, with the understanding the second secondary member of the pair mirrors the shape of the first secondary member. The first of the pair of secondary members 40 has a proximal portion that extends laterally from the first member 22. In the present embodiment, the lateral direction is substantially lateral to the longitudinal direction of the elongate member and substantially lateral to the transverse distance between the first member 22 and the brush head 50. The lateral direction may also be considered as lateral to the plane in which the elongate member lies in. Viewing the toothbrush product from the front profile, for example as depicted in FIG. 1C, the proximal portions of the secondary members 40 extend outwardly to either side (left and right) of a central part formed by the elongate member.

[0166] Each of the secondary members 40 also has a distal portion that extends transversely across the transverse distance between the brush head 50 and the first member 22.

[0167] The distal portion of the secondary member 40 depends from the proximal portion of the secondary member 40 i.e. extends in a downward direction. The proximal portion ensures that the distal portion is provided at a lateral distance from the first member 22 and centre of the brush head 50. As may be seen, for example, from FIG. 4D, the secondary members 40 are dependent from the first member 22 and form an overhanging profile. The overhanging profile may allow the support member to provide the brush head at the root of the tooth or tooth prosthesis.

[0168] As depicted in, for example, FIG. 1D, in some embodiments, the distal portion of each of the secondary members 40 curves away from the handle 20 in a generally forward direction. In other embodiments, for example the embodiment depicted in FIG. 4, the distal portion of each of the secondary members 40 curves towards the handle 20 in a generally backward direction.

[0169] The brush head 50 spans the distance between the distal portions of the secondary members 40. Together, the secondary members 40, the brush head 50 and at least part of the first member 22 form a closed loop. The closed loop is depicted, for example, in FIG. 1C. The closed loop may have different profiled shapes in different embodiments. For example, the loop may have a tooth shaped profile. The closed loop provides an aperture, through which the at least part of the tooth is able to pass through allow placement of the tufts at the cleaning position.

[0170] Between the first member 22 and the secondary member 40 there is a shoulder coupling. The shoulder coupling is shaped to project the secondary members 40 substantially in the transverse direction. In accordance with embodiments, the shoulder coupling may project the secondary member 40 at an angle. In some embodiments, the angle in the range between 15 degrees and 250 degrees. In some embodiments, the angle is between 80 degrees and 120 degrees.

[0171] In the embodiment depicted, for example, in FIG. 1, the shoulder coupling is non-detachable, i.e. the secondary members 40 and the first member 22 formed part a single member. In other embodiments, the secondary members 40 and the first member 22 are permanently connected. However, it will be understood that in other embodiments, these parts are detachable from each other. The shoulder coupling this may be any suitable coupling, for example, a hinge joint, a dovetail, a pivot latch joint.

[0172] The shoulder coupling may allow the handle portion to be maintained substantially horizontally, in use, while providing the brush head at the exposed surface of the tooth or tooth prosthesis.

[0173] The secondary members 40 thereby form a void in a substantially transverse plane. The transverse plane may be considered as a plane in which the secondary members 40 substantially lie in. As the secondary members 40 have a curved profile, it will be understood that the void may lie, mostly in such a plane, however, the void may have a curved profile.

[0174] In the present embodiment, as depicted in FIG. 1, the elongate member, in particular the handle 20, is substantially normal or perpendicular to the transverse plane in which the void is provided. It will be understood that substantially normal may be in a direction within a suitable angular range of 90 degrees.

[0175] In use, the toothbrush product may be placed in a cleaning position in the oral cavity such that the tufts of the brush head are in contact with a mesial or distal surface of the tooth or tooth prosthesis. In the cleaning position, the transverse distance is along an inferior-superior axis. In the cleaning position the transverse distance is substantially parallel to a coronoapical axis e.g. parallel to the long axis of the tooth or tooth prosthesis being cleaned. In the cleaning position at least part of the tooth or tooth prosthesis being cleaned may be present in the void.

[0176] The brush head 50 has bristles 51 mounted thereon. The secondary members 40, the brush head 50 and bristles 51 (plurality of tufts) together may also be referred to as the “brush head assembly”. The brush head assembly may form a detachable component of a toothbrush kit together with the elongate member (the handle and first member).

[0177] The bristles 51 are provided as a plurality of tufts. The brush head has a first surface that faces a forward direction and a second surface that faces a backward direction that may be referred to as forward and backward surfaces, respectively. In FIG. 1, the plurality of tufts are depicted on the forward surface extending in a generally forward direction, in accordance with embodiments, however, it will be understood that they may be provided on a surface extending in a backward direction (towards the back end of the elongate member) for example, as depicted in FIG. 4. In some embodiments, a first plurality of tufts is provided on the forward surface, extending in a forward direction and a second plurality of tufts may be provided on a backward surface extending in a backward direction. An example of such an embodiment is depicted at FIG. 6A.

[0178] By providing a toothbrush product having a void in a transverse plane, defined relative to a longitudinal direction of a handle, the toothbrush may benefit from a number of advantages. In particular, easier manipulation of the toothbrush to place bristles to a desired brushing position at an exposed mesial or distal surface. Relative to the handle 20, the first member 22 is shaped to aid in the application of the brush head 50 to the said tooth surfaces and minimise collision of the device with other teeth during use.

[0179] The angle (W) FIG. 11 between the longitudinal axis 32 of the handle 20 (also referred to as a handle axis) and the longitudinal axis 33 of first member 22 (also referred to as a forward axis) may optimise the ability of the brush head assembly to reach the area to be cleaned and may vary from 70 degrees to 290 degrees. In some embodiments, the angle W may be in the range 160 and 200 degrees.

[0180] In other embodiments, the brush head assembly may be at the distal end of the handle and without the presence of a first member.

[0181] In other embodiments FIGS. ’s1A-1E, 1G-1I, 7-10, the elements of the device may be arranged so that it may be used for the cleaning of mesial tooth surfaces.

[0182] In other embodiments FIGS. ’s4A-4G, the elements of the device may be arranged so that it may be used for the cleaning of distal tooth surfaces.

[0183] In other embodiments FIGS. ’s5A-5C, the elements of the device may be arranged so that it may be used for the cleaning of either mesial or distal tooth surfaces by way of inclusion of an additional set of all the said parts, features and arrangements, other than the handle, at the proximal end of the handle imparting a double-ended structure to the device.

[0184] While the embodiments depicted in the Figures have two secondary members 40, for example, FIG. 1 depicts two secondary members in a bifurcating arrangement, for example, forming a loop profile together with the brush head, it will be understood that in other embodiments, a single secondary member or support member may be provided that is shaped to provide the brush head at a transverse distance from the elongate member. The single support member and the brush head may form a hook profile. The hook profile, like the loop profile, allows the support member to be place around the tooth allowing the brush head to be placed in a gap adjacent to the tooth. The hook profile may be provided in a substantially transverse plane. In some embodiments, the single secondary member may support the brush head in a cantilever arrangement.

[0185] The secondary members 40 may have a curved profile in both the lateral and transverse directions. In embodiments FIGS. ’s1, 4-13, the secondary members 40 may have compound curves in their form in order to minimise their collision with teeth during use and to support the brush head 50 in the most effective position possible to fulfil the said purpose as follows. The first portion of each secondary member 40A FIG. 12 is shaped as follows: from its proximal to its distal aspect, it projects mostly laterally. It also curves a little towards the sulcus. The second portion of each secondary member 40B is shaped as follows: from its proximal to its distal aspect, it projects mostly towards the sulcus. It curves and projects laterally away from the tooth a little. It also curves a little distally if it is part of an embodiment primarily for mesial tooth surface use 44 or, a little mesially if it is part of an embodiment primarily for distal tooth surface use 45. The third portion of each secondary member 40C is shaped as follows: from its proximal to its distal aspect it projects mostly towards the sulcus. It curves and projects laterally towards the tooth a little. It also curves a little distally if it is part of an embodiment primarily for mesial tooth surface use 44, or mesially if it is part of an embodiment primarily for distal tooth surface use 45. In some embodiments, the secondary members 40 have more than one curved portion, each portion having a variable radius of curvature.

[0186] The angle (Y) FIG. 11 between the longitudinal axis 34 of the second 40B and third 40C sections of the secondary members (also referred to as the support member axis) and the longitudinal axis 33 of first member 22 may optimise the ability of the brush head 50 to reach the area to be cleaned and may vary from 15 degrees to 250 degrees. In some embodiments, the angle Y may be in the range between 80 and 120 degrees. Serving the same purpose, the angle (X) FIG. 11 between the longitudinal axis 34 of the second 40B and third 40C sections of the secondary members (which may also be referred to as the support member axis) and the longitudinal axis 32 of the handle 20 (also referred to as the handle axis) may vary from 30 degrees to 150 degrees. In some embodiments, the angle Xis in the range 70 to 110 degrees.

[0187] The longest dimension of the brush head which herein is referred to as the width 30 of the brush head assembly may be from 5 to 50 mm and the length of the secondary members may be from 5 to 80 mm.

[0188] Brush head assemblies in various embodiments may be orientated according to their primary use in either for the cleaning of mesial or distal tooth surfaces.

[0189] The brush head assembly may have just one secondary member and at its distal end suspend the brush head by one of its ends in a cantilever arrangement.

[0190] The secondary members may have any shape required to fulfil the essence of the invention. Their shapes may lie on a flat plane or flat planes. They may be straight or straighter than as depicted in the embodiments showing compound curves in FIGS. ’s1, 5-13. They may have simple curve forms.

[0191] The brush head of FIGS. ’s1, 5-13 has bristles FIGS. ’s1, 5-13 mounted thereon. Relative to the secondary members, it is angled to allow very close access to the said tooth surfaces and gingival margins by the bristle tips.

[0192] The brush head may be one of any variety of shapes in order to accomplish the essence of the invention, for example as in FIGS. ’s7-10 incorporating curved SOE and/or flat sections 50D. In various embodiments, the brush head may comprise a profile that is: curved, concave, convex, tear-drop, arched, flat, straight. As described above, the brush head forms part of a closed loop. The shape of the loop is therefore dependent on the shape of the brush head.

[0193] The brush head may be shaped with compound curves SOE so that in the motions described above, the bristles will be allowed to act as efficiently as possible throughout the linear reciprocating motion of the user 28 and carry the bristles and their tips against the tooth along the gingival margin. In the embodiment depicted in FIG. 8, the middle section SOE curves coronally and mesially if brush head assembly is for mesial tooth surface cleaning 44. The middle section SOE curves coronally and distally if head assembly is for distal surface cleaning 45. Flat end-sections 50D contribute to a smoother motion at the extremities of the reciprocation.

[0194] In other embodiments, the brush head may have a single constant curve with equal length bristles FIG. 7, curving coronally and mesially if the brush head assembly is for mesial surface cleaning; and, curving coronally and distally if it is for distal surface cleaning.

[0195] Alternatively, the brush head may be straight with bristles of any length or lengths upon it, for example, with their tips in a curved formation.

[0196] Alternatively, the brush head may be straight with bristles of equal lengths. Alternatively, the brush head may be straight with bristle tips arranged along a compound curve in the centre region and along a straight edge at its two extremities FIG. 10.

[0197] The brush head in preferred embodiments may have a teardrop-shaped cross section 52. This is a compact arrangement which allows the head 50 and bristles 51 to tuck under the overhangs of fillings, fixed prostheses and tipped teeth 26. It also allows an increased strength to the brush head while minimising its bulk in key areas.

[0198] A brush head may be double sided enabling it to assist the user in cleaning mesial or distal tooth surfaces FIGS. ’s6A-6E. It may consist of one or two brush heads and two sets of bristles, set back-to-back and mounted at the end of the secondary member or members. Any of the permutations described for any other embodiments herein also apply to any aspect of the embodiment with this dual-purpose brush head.

[0199] The bristle bundles 51 may consist of one of any combination of qualities, for example in length, shape, hardness, and being set at various angles upon the brush head 50.

[0200] The bristles in the various embodiments may vary in length between 1 mm and 15 mm.

[0201] FIG. 6C depicts a first plurality of tufts provided on a first, forward surface of the brush head and a second plurality of tufts provided on a second, backward surface of the brush head. The first plurality of tufts are aligned along a first tuft axis and the second plurality of tufts are aligned along a second tuft axis and the angle between the first tuft axis and the second tuft axis may be in the range from 30 degrees to 280 degrees, and preferably between 90 degrees and 180 degrees.

[0202] In preferred embodiments, the bristles may be made of elastomer which has been injection molded over a plastic brush head. Advantages are gained in the use of injection over-molded elastomeric bristles on plastic heads FIGS. ’s1F, 6C instead of nylon bristle tufts embedded in a plastic head. It offers the scope to manufacture a brush head structure which can have a high finesse in its cleaning function at the said sites due to its shape and in the possible positioning of bristles thereon. Elastomeric bristles’ properties can be specified to be very gentle on inflamed gingival tissue and pleasant to use. The structure of this innovative device is so effective at bringing the bristles into direct contact with the delicate gingival margin of a single tooth that the potential abrasion of this tissue must be considered thus.

[0203] Further advantages that elastomer molded over plastic offers over common nylon bristle brush head structures are: brush head dimensions can be more compact; in a given set of dimensions of brush head a variety of individual bristle characteristics can be incorporated within very close proximity for example by a variety of bristle lengths, angles or diameters; and, advantages of properties of a carefully specified plastic core can be utilised, for example with a combination of flexibility and firmness without leading to permanent deformation in use; and, also in optimising the distribution of forces generated by the user to the bristles.

[0204] In many of the embodiments depicted here, the elastomer has been over-molded not only onto the brush head but also extending along and upon a significant length of the secondary members. This offers a more cushioned and comfortable sensation to the user if the secondary members collide with teeth during use. Extension may also include around the brush head. This allows a softer material to be resting and rubbing on the alveolus and gingival margin minimising their trauma during use.

[0205] In other embodiments, the replacement of the bristles with the retention of the rest of the device may be possible. The set of elastomer bristles and elastomer brush head sections may be structured so that they may be reversibly attached together by the user.

[0206] The employment of nylon instead of elastomer tufts on the brush head is an option with this device. They may be formed as filament bristles, for example, end-rounded, tapered, spiral, core-sheath, etc. in other embodiments.

[0207] Teeth have a tendency to be tipped slightly more mesially than distally, especially when a tooth has been lost adjacent to the mesial aspect. Therefore, in the demonstrated embodiments FIGS. ’s1, 4-13, the bristle tips are profiled appropriately to optimise their contact with the target sites of either mesial 44 or distal 45 surfaces. The bristle tuft structures are not limited to those demonstrated here as there is a broad range of bristle angles, lengths and tip profiles possible to accomplish the essence of the invention. The angle (Z) FIG. 11 between the longitudinal axis of the bristles 35 and the longitudinal axis of the second and third portions of the secondary members 40B, 40C may vary from 40 degrees to 320 degrees.

[0208] The bristles may have antimicrobial properties. The bristles may have plaque repellent properties.

[0209] The brush head assembly and first member together may incorporate features allowing it to be compatible with, attached to and for use with electric-powered toothbrushes known in the art, for example, the Philips Sonicare range.

[0210] In other embodiments FIGS. ’s13A-13F, a brush head assembly 57 is presented to the user separately from a first member and has a joint 56 to unite the two. The functions of the joint may include allowing the union of the two parts to be reversible; allowing the use of the brush head assembly in mesial cleaning FIG. 13E or distal cleaning configurations FIG. 13F; and, in permanent union of the two parts.

[0211] Advantages of having a joint are that the whole device may be presented to the user as two separate pieces and packaged in a more flat and compact state; the whole device may serve in the cleaning of one of, or both, mesial and distal surfaces; the manufacturing cost outlay may be less due to only one specification being required for both mesial and distal surface cleaning versions of the device; and, brush head assemblies may be replaced by the user with the handle and first member parts being retained. With regards specifically to the joint being permanent, this may enhance safety during use of the device and allow it to have a dedicated purpose in mesial or distal surface cleaning once assembled.

[0212] The joint may consist of one of the many structures that are known in the art, for example, a sliding dovetail joint. Alternatively, a basic latch 54 with a permanent or reversible latching action may be employed. The joint may be oriented to allow optimal positioning of the brush head assembly for configurations for mesial or distal tooth surface cleaning. The joint may be able to rotate, for example, as in a hinge or pivot joint, and may allow the user to swing the brush head assembly between various positions so that it may serve the purpose of cleaning mesial and distal surfaces.

[0213] Any of the said permutations described for any of said embodiments herein also apply to any embodiment which includes the joint feature.

[0214] Any part of any embodiment may be made of plastic, elastomer, biodegradable materials or any other material conducive to manufacturing the device and upholding the essence of the invention.

[0215] A skilled person will appreciate that variations of the enclosed arrangement are possible without departing from the invention. Accordingly, the above description of the specific embodiment is made by way of example only and not for the purposes of limitations. It will be clear to the skilled person that minor modifications may be made without significant changes to the operation described.

TABLE-US-00001 DRAWING REFERENCE NUMERALS 20 handle or handle portion of elongate member 21 finger grip 22 first member or forward portion of elongate member 24 tooth 25 gingiva 26 periodontally diseased and mesially tipped tooth 27 typical direction of users’ force which seats the device 28 typical reciprocating brushing motion by users when cleaning these sites 30 total width of brush head assembly 32 longitudinal axis of handle or handle axis 33 longitudinal axis of first member or forward axis 34 longitudinal axis of second and third portions of secondary member or support member axis 35 longitudinal axis of bristles or tuft axis 40 secondary member or support member 40A first (proximal) portion of secondary member 40B second (middle) portion of secondary member 40C third (distal) portion of secondary member 41 border between elastomeric coating and uncoated plastic 42 elastomeric material 43 plastic material 44 example of brush head assembly for use on mesial surfaces 45 example of brush head assembly for use on distal surfaces 46 brush head assembly with double brush head for cleaning of both mesial and distal tooth surfaces 50 brush head 50D flat section of brush head SOE compound curve section of brush head SOF brush head with constant radius curve 50G straight brush head 51 bristles or plurality of tufts 52 teardrop shaped cross section of brush head 53 male part of joint at distal end of first member 54 latch of male part of joint 55 female part of joint within brush head assembly 56 assembled joint 57 brush head assembly for mesial or distal surface cleaning with integrated female part of joint 58 first member with male part of joint at its distal end 59 bristles orientated for cleaning of mesial tooth surfaces 60 bristles orientated for cleaning of distal tooth surfaces W angle between longitudinal axis of handle (also referred to as a handle axis) and longitudinal axis of first member (also referred to as a forward axis) X angle between longitudinal axis of handle (also referred to as the handle axis) and longitudinal axis of second and third portions of secondary members (also referred to as a support member axis) Y angle between longitudinal axis of first member (also referred to as the forward axis) and longitudinal axis of second and third portions of secondary members(also referred to as the support member axis) Z angle between longitudinal axis of bristles (also referred to as a tuft axis) and longitudinal axis of second and third portions of secondary members (also referred to as the support member axis).