in fig1 to 5 and 8 and 9 the device according to the invention is designed as a bracket comprising a base with two pairs of bracket wings spaced from one another . however , such a design of the base is not imperative for the present invention . accordingly , a suitable base for a bracket may , for example , have only one pair of bracket wings or no bracket wings at all or it may be of trapezoidal design . a further alternative is shown in fig6 and 7 , where in the actual sense no bracket wings at all are provided for the insertion of ligatures . a first embodiment of an orthodontic device according to the invention , generally designated by reference numeral 100 , is shown in fig1 and 2 of the drawings . the device 100 is designed as a bracket with a base 115 having on its underside a curved surface 120 as base surface for fixing the device 100 to a tooth . at the side facing away from the curved surface 120 , the base 115 forms two pairs of bracket wings 125 which are aligned in spaced parallel relation to each other . an elongated rectangular slot 130 passes through the base 115 in the longitudinal direction thereof . the slot 130 is defined by a bottom surface 135 and by two side surfaces 140 arranged on either side of the bottom surface 135 and aligned in spaced parallel relation to each other . the two opposed side surfaces 140 of the slot 130 each comprise a semicircular groove 145 . these grooves 145 lie opposite each other , are aligned in parallel with each other and jointly form a positively locking guide in which a slide 155 is held insertably and detachably as cover element . the slide 155 is pin - shaped and has two guide ribs 160 aligned parallel to each other as guide elements , which engage the positively locking guide formed by the grooves 145 . the pin - shaped slide 155 has a triangular headpiece 165 at one end and is provided with a receiver 170 extending transversely to the guide ribs 160 for a securing element or as force application point for a conventional medical instrument for removal ( not illustrated ), with which the slide 155 is removable from or fixable to the base 115 , for example , by means of a ligature or a wire as securing element . the slide 155 of the orthodontic device 100 can be removed from the base 115 by pushing the slide 155 in the longitudinal direction of the slot 130 , so that the base 115 and the slide 155 are then separate from each other , as shown in fig2 . by placing or sliding the slide 155 into the positively locking guide formed by the grooves 145 , the slot 130 of the base 115 is covered again in the longitudinal direction . a second embodiment of the device , generally designated by reference numeral 200 , is shown in fig3 of the drawings . the slide 255 of the device 200 has a ring - shaped headpiece 265 by means of which the slide 255 is removable from the base 215 , for example , by means of a hook - shaped medical instrument . a third embodiment of the device , generally designated by reference numeral 300 , is shown in fig4 and 5 of the drawings . the slide 355 of the device 300 comprises at each of the sides provided with the guide ribs 360 a recess 375 and a movable locking element 380 protruding beyond the guide ribs 360 . the locking element 380 comes to rest with a surface thereof against one of the pairs of bracket wings 325 of the base 315 and thus secures the slide 355 against displacement on the base 315 . by pressing the locking elements 380 into the recesses 375 , the locking of the slide 355 on the base 315 is released , so that the slide 355 is removable from the base 315 in the longitudinal direction of the slot 330 , and after removal , the slide 355 and the base 315 are separate from each other ( fig5 ). a fourth embodiment of the device , generally designated by reference numeral 400 , is shown in fig6 and 7 of the drawings . the slide 455 of the illustrated device 400 has an approximately i - shaped profile transversely to its longitudinal direction . the slide 455 is provided on either side thereof with two guide ribs 460 which are interrupted in the longitudinal direction and with a headpiece 465 , which has on either side of the slot 430 a bulge 490 pointing in the direction of the guide ribs 460 . the guide ribs 460 of the slide 455 are inserted in the positively locking guide formed by the grooves 445 , and the bulges 490 engage the space between the pairs of bracket guides 425 of the base 415 and thus secure the slide 455 on the base 415 ( fig6 ). for improved handling of the slide 455 , it has a grip element 466 which can be easily removed , for example , broken off , after insertion of the slide 455 into the grooves 445 . to release this locking of the slide 455 , the bulges 490 must be guided past one of the pairs of bracket guides 425 . the bulge 490 , the headpiece 465 or the slide 455 in its entirety is , therefore , preferably made of an elastic material such as , for example , a plastic material . owing to the gaps 461 created by the interruption in the guide ribs 460 between the guide rib sections , the cover element 455 can be inserted on the buccal side into the slot 430 and brought with a small sliding movement in the longitudinal direction of the slot into its end position . in particular , this is advantageous when the orthodontic device 400 according to the invention is to be fixed at short distances from further such devices to the adjacent teeth of the patient . the displacement path for the cover element is thus considerably shortened in comparison with the embodiment of fig4 and 5 . once the cover element 455 has reached the final position ( fig6 ), the grip element 466 , which has so far served as holder , can be broken off or clipped off , thereby leaving only the actual slide 455 in the slot 430 of the bracket . the slide 455 then remains inserted in the slot 430 during the treatment period and replaces hitherto conventional ligatures . when exchanging the archwire , the slide 455 can , of course , be removed from the slot and then replaced by a new cover element . for this reason , the brackets of fig6 and 7 do not have the otherwise standard bracket wings . a fifth embodiment of the device , generally designated by reference numeral 500 , is shown in fig8 and 9 of the drawings . the slide 555 of the device 500 is t - shaped and has a curved cover 595 as veneer element , with a projection 590 provided on its inner surface . in this embodiment the guide ribs 560 of the slide 555 also engage the positively locking guide formed by the grooves 545 , and the cover 595 completely covers the bracket wings 525 from the side of the base 515 facing away from the curved surface 520 as well as the space located between these bracket wings 525 . the cover 595 is preferably tooth - colored so as to conceal any aesthetically disadvantageous appearance of the base 515 . the projection 590 arranged on the inner surface of the cover 595 engages the space between the two pairs of bracket wings 525 and thus locks the slide 555 to the base 515 . in order to open the slot 530 of the device 500 depicted in fig8 , the projection 590 locking the slide 555 to the base 515 must be moved past one of the pairs of bracket wings 525 . for this purpose it is advantageous for the slide 555 or the cover 595 or at least the projection 590 to be made of an elastic material . in fig1 and 11 , the device according to the invention is designed as a buccal tube with a base comprising two through - bores aligned in parallel with each other . however , such a design of the base is not absolutely necessary , since for its suitability as buccal tube it is essential that it has a slot closed on the buccal side for reception of the end area of an archwire . therefore , the base may , for example , also be of cube - shaped or trapezoidal design and have one or a plurality of through - bores or no through - bore . an orthodontic device according to the invention , generally designated by reference numeral 600 , in accordance with a sixth embodiment , is shown in fig1 and 11 of the drawings . the device 600 is designed as a buccal tube . the base 615 has on its underside two curved surfaces 620 adjacent to each other for attachment of the device 600 to a tooth . the base 615 has two through - bores 697 , 698 aligned parallel to each other , between which a rectangular slot 630 is arranged for reception of an archwire . the slot 630 is defined by two parallel side surfaces 640 and by a bottom surface 635 perpendicular to these . the bottom surface 635 extends at an angle in relation to the longitudinal direction of the through - bores 697 , 698 . a semicircular elongated groove 645 is provided at each of the two side surfaces 640 of the slot 630 . the grooves 645 are aligned parallel to each other and to the bottom surface 635 and jointly form a positively locking guide for reception of a slide 655 . the slide 655 is in the form of a small plate with a guide rib 660 bordering for the most part both sides thereof . the slot 630 of the device 600 is covered by the slide 655 by the guide ribs 660 of the slide 655 being introduced into the positively locking guide formed by the grooves 645 , and the slide 655 is held with a clamped fit in the positively locking guide on the base 615 by the guide ribs 660 which increase in thickness in a longitudinal direction of the slide 655 . fig1 and 13 show a seventh embodiment of the device according to the invention , which is generally designated by reference numeral 700 . the device 700 is designed as a bracket and comprises a base 710 with a base surface 720 and a slot 730 extending in the longitudinal direction and facing away from the base surface 720 , in which a cover element 735 is slidably insertable . the basic design of the slot 730 and the corresponding design of the cover element 735 are also implemented here in analogy with the embodiments discussed hereinabove in order to obtain a positively locking guide . the cover element 735 comprises a grip part 755 at which it can be easily introduced into the slot 730 of the base 710 . since the device 700 is designed as a bracket , it comprises binding wings 725 , via which an archwire ( not shown herein ) can be fixed later when the device 700 is used as a pure bracket . at its front end in the direction of insertion , the cover element 735 carries a projection 740 , which initially protrudes forwards in a straight manner in the uninserted state , and , once the cover element 735 has reached its end position in the inserted state in the base 710 , can be bent over upwards ( alternatively , if desired , downwards ) in the manner shown in fig1 and 13 . the projection 740 thereby forms a mechanical securing element to prevent unintentional release and pulling out or sliding out of the cover element 735 , which can be provided additionally or alternatively to the securing measures already described in conjunction with some of the above embodiments . alternatively , as indicated in broken representation in fig1 , the projection 740 can comprise a notch 750 , which , alternatively to the upward or downward bending of the projection 740 or also additionally thereto , allows a deformation of the projection in the sense of an expanding in the horizontal direction . alternatively or additionally thereto , the projection 740 can also be designed so that it is connectable to the base 710 in a positively locking manner , for example , by spot welding or adhesive bonding , and this connection must then first be broken , for example , with an instrument , before the cover element 735 can be removed again . this additional security measure , which can only be undone with an instrument , may be desired in some special cases of use , where owing to particular strain on the device 700 , unintentional detachment of the cover element 735 during use would otherwise have to be anticipated . the base 710 of the seventh embodiment comprises at the rearward side of the base 710 in the figures a small hook 760 which can be used as anchor point for further correction devices used together with the archwire and the brackets . the small hook 760 may be provided supplementarily or alternatively to a binding wing 725 on the base 710 . the cover element 735 preferably also comprises a stop 765 which defines the depth of insertion of the cover element 735 in the direction of the slot 730 .
to create an orthodontic device with a base having a base surface for fixing the device to a tooth , and a slot for receiving an archwire , which is defined by a bottom surface and two side surfaces arranged on either side of the bottom surface and aligned in substantially parallel spaced relation to each other , and which extends in a substantially straight line through the base in the longitudinal direction of the base on a side thereof facing away from the base surface , and with a cover element for at least partially covering the open side of the slot facing the bottom surface , which is convertible and is easier to handle during the conversion , and which offers the wearer an increased degree of security , it is proposed that the side surfaces of the slot have a positively locking guide , which is aligned substantially parallel in relation to the longitudinal direction of the slot , and in which the cover element is slidably and detachably held on the base .