Instrument for setting up dental carrier

Abstract

An instrument (10) for setting a dental carrier (18) is provided, where the instrument (10) is in a releasable form-fitting connection with the structure of the carrier (18) to be placed during setting, where the instrument (10) further comprises a handle portion (12) and a head portion (14) designed for holding the carrier (18) to be placed. The form-fitting connection is at least partially achieved by at least one retaining element (50) provided on the head part (14), which retaining element is designed to retain the carrier (18) by engaging into a carrier groove (22) of the carrier (18) to be placed. An integrated positioning cross laser may generate horizontal laser lines (30) on the left and right sides (30) of a carriage slot (22), and vertical laser lines (28) orthogonal to the horizontal laser lines (30).

Description

Technical Field

[0001] The utility model relates to an instrument for setting a dental bracket. Background Art

[0002] Dental brackets are commonly used in orthodontic treatment to correct tooth misalignment using fixed dental brackets.

[0003] In conventional orthodontic treatment, brackets are usually attached to the front surfaces of teeth using adhesives. These brackets can be made of various materials, such as metal, plastic or ceramic. Once the brackets are firmly bonded to the teeth, they are connected to each other using a metal wire known as an archwire. The archwire applies a desired amount of gentle pressure (also known as preload) to gradually move the teeth to their desired position. The combination of brackets and archwires forms an essential part of the orthodontic treatment process, allowing controlled and precise tooth movement.

[0004] For this purpose, the wire is inserted into a recess in the bracket, the so-called bracket groove, and fixed there.

[0005] In conventional systems, the wires are secured in the bracket slots using rubber bands or with short metal ties.

[0006] In the so-called self-knotting system, a dedicated closing mechanism integrated into the bracket is used to hold the wire without the need for rubber bands or other ties.

[0007] Accurate placement of brackets during the adhesive bonding process is an essential aspect of orthodontic practice, which is critical to ensure the quality of orthodontic supply.

[0008] Conventionally, to improve the adhesion of the adhesive, these brackets are laterally embraced with the aid of special spring-loaded pliers or forceps after the tooth fronts have been pre-etched, and then placed on the tooth fronts by the operator by applying adhesive (usually UV curing adhesive).

[0009] Before the adhesive cures, position correction is still possible to a certain extent.

[0010] In order to ensure consistent and precise alignment across the row of teeth during bracket placement, a special tool called a "locator" (locator) can be used. Alternatively, gauges can be used to make fine adjustments during the adhesive bonding process. However, it is important to note that the use of these gauges requires a high level of dexterity and fine motor skills from the orthodontist.

[0011] The conventional method of bracket positioning using a positioner has limitations because it only takes into account the height position and ignores other important degrees of freedom. In addition to the lateral position (centering the bracket on the tooth), there is also the possibility of angular rotation around the axis. Errors in these adjustments may require complex and time-consuming corrective measures for the patient.

[0012] Removing a newly engaged bracket may pose risks such as breakage or damage to the tooth structure due to the applied force required during removal.

[0013] Furthermore, prolonged use of specialized spring-loaded forceps carries inherent medical risks for orthodontists. This includes excessive strain on the tendons of the hand and the potential for inflammation, particularly in thumb support devices. This orthopedic overload can lead to chronic arthritis pain, creating long-term risks that may ultimately result in occupational disability.

[0014] In addition to vestibular brackets, lingual brackets are frequently used in orthodontic treatment. However, bonding lingual brackets directly to the lingual surfaces of a patient's teeth can be a time-consuming and labor-intensive process. This is primarily due to the limited accessibility and suboptimal visualization of the lingual surfaces, as well as the anatomical differences that exist. Therefore, orthodontic treatment involving lingual brackets requires a high level of skill and expertise from the orthodontist. Utility Model Content

[0015] The purpose of the utility model is to introduce an instrument capable of quickly and highly accurately positioning brackets (whether vestibular or lingual) using direct and indirect bonding techniques. This instrument allows precise alignment in all degrees of freedom, thus ensuring optimal placement of brackets during orthodontic treatment.

[0016] In order to solve the previously mentioned problems, the proposed solution is to design an instrument for placing dental brackets. During the placement process, the instrument can form a releasable and secure connection with the bracket structure. It consists of a handle part and a head part, which is specially designed to securely hold the bracket to be positioned.

[0017] According to one aspect of the utility model, the instrument provides a form-fit connection, which is achieved by arranging one or more retaining elements on the head portion. These retaining elements are specially designed to firmly engage with the bracket slot of the positioned bracket, thereby ensuring a reliable and accurate attachment.

[0018] Unlike conventional clamps or forceps that enclose the bracket itself, the proposed instrument works by gripping a bracket slot or bracket gap specifically designed to accommodate the wire. This unique approach allows for temporary fixation of the bracket, enabling precise and reproducible positioning on the tooth surface. The bracket can be aligned within a designated adhesive bed, whereupon the adhesive cures, potentially utilizing ultraviolet radiation to accelerate the process, as is commonly practiced.

[0019] The use of the bracket slot provides several advantages. First, it eliminates the need to apply a continuous mechanical holding force to the instrument, unlike clamps or forceps. This therefore relieves potential strain on the orthodontist's tendons, muscles and joints, minimizing the risk of long-term overload and associated musculoskeletal complications. By utilizing the design of the bracket slot, the instrument achieves secure fixation of the bracket during the positioning process, ensuring effective and ergonomic orthodontic surgery.

[0020] Furthermore, the form-fitting fixation within the bracket slot allows for significantly improved accuracy in aligning the bracket in terms of position and angular orientation. In a preferred embodiment of the instrument, this precise alignment is further enhanced by incorporating a cross laser. The integrated cross laser helps visually guide the orthodontist, facilitating even more accurate bracket placement and alignment. By utilizing this combination of form-fitting fixation and cross laser technology, the instrument enables the practitioner to achieve optimal positioning of the bracket, thereby enhancing treatment outcomes.

[0021] A temporary form-fit connection between the bracket and the instrument can be achieved through precisely designed structures that fit into the bracket slot with slight play or minimal oversizing. This precise dimensional accuracy allows for a secure yet releasable clamping action within the bracket slot. By carefully designing these components, the instrument and bracket establish a reliable connection, ensuring stability during the positioning process while still being easily removable when necessary.

[0022] In order to ensure the versatility of the instrument for various bracket types with different bracket slot geometries, an alternative approach involves the orthodontist using an additional temporary retaining substance (such as wax) in conjunction with the instrument. In this case, the structure engaging with the bracket slot can be designed to be thinner and adaptable to different solder sizes. The retaining substance used as an intermediary facilitates a firm form-fitting connection between the instrument and the bracket, allowing flexibility in adapting to various bracket designs, which can be compensated by using a temporary retaining substance like wax.

[0023] Additionally, the fixation of the bracket can also be achieved using additional elements on the instrument that apply lateral pressure to specific structures of the bracket. These supplementary elements are used to provide additional levels of fixation and stability to the bracket, thereby further fixing its position during the orthodontic procedure.

[0024] In a preferred embodiment, the head of the instrument has a web on its end side. The web is specifically designed to engage with the bracket slot, as previously described. Depending on the specific requirements, the web can engage with varying degrees of clearance within the bracket slot. In cases where a larger clearance is required, it is recommended to utilize a retaining substance such as wax or an alternative retaining structure to ensure a secure and reliable connection between the instrument and the bracket. This approach provides flexibility to accommodate different bracket slot sizes and ensures effective bracket positioning during orthodontic surgery.

[0025] To achieve accurate centering of the bracket in the instrument, the distance between these limiting legs is preferably calibrated to match the typical width of the bracket. When the distance roughly corresponds to the bracket width (with a slight margin for slightly larger distances), the bracket can be accurately centered in the instrument.

[0026] Depending on the specific geometry of the bracket, they may have additional slots oriented transversely to the bracket slots. The additional slots allow engagement with a properly adapted instrument according to the present invention. The instrument is designed to effectively engage both the bracket slots and the transverse slots, thereby providing versatile compatibility with a variety of bracket designs.

[0027] In alternative embodiments, instead of an H-shaped web structure, a web within the head portion of the instrument may be penetrated by generally laterally disposed legs, either generally at the center or at the ends. This configuration results in a generally plus-shaped structure (when the legs are generally centrally located) or a T-shaped structure (when the legs are located at the ends). These variations allow for different options for engagement with the bracket slots and provide additional flexibility to accommodate a variety of bracket designs, such as for self-illuminating brackets with built-in mechanisms.

[0028] In another embodiment, not explicitly depicted in the drawings, the transversely arranged legs are designed to be movable primarily in the direction of the web. This allows exerting a compressive force on the two legs, enabling additional fixation of the placed bracket. By exerting this compressive force, the instrument ensures a fixed and stable attachment of the bracket during an orthodontic procedure.

[0029] In one embodiment, a web within the head portion of the instrument may be defined at its ends by two generally transversely disposed legs. This configuration creates an H-shaped structure for the web. Additionally, the web may extend beyond the legs on one or both sides, allowing for increased versatility and adaptability when engaging with the bracket slot.

[0030] This can be achieved by incorporating linearly movable legs, allowing straight forward compression of the bracket. Alternatively, the legs can be designed to pivot, acting similarly to pliers or forceps. In this case, the spacing between the legs needs to be adjusted to match the width of the bracket being applied. By adapting the spacing accordingly, the instrument can effectively hold and secure the bracket, ensuring precise positioning and fixation during orthodontic surgery.

[0031] The application of the compressive force directed toward the centerline of the instrument can be achieved by a spring-loaded mechanism. This mechanism can be designed to apply a constant and continuous compressive force, or it can be released by the orthodontist. In the releasable configuration, the compressive force can be controlled by the operator, typically by actuation of a button, lever or similar mechanism. This enables the opening of these pliers or forceps brackets, allowing easy insertion and removal of the bracket.

[0032] In order to minimize the risk of orthopedic degenerative problems for the operator, it is preferable to avoid requiring the operator to continuously apply force to hold the bracket.

[0033] Instead, emphasis is placed on a design that requires the operator to apply force only when releasing the bracket. This approach reduces strain on the operator's hand and minimizes the possibility of long-term musculoskeletal problems. In fact, these pliers or forceps grips can be used in conjunction with a form-fitting hold of the bracket, which secures the bracket in its desired position. Furthermore, it can also be used with a wax fixture if necessary.

[0034] In a particular embodiment, one or two centering teeth may be positioned above and / or below the web, spaced from the web along the longitudinal extension. These teeth are designed to engage with a recess-like structure present in the bracket. By doing so, they contribute to the centering of the instrument relative to the bracket and provide an additional means of fixing when necessary.

[0035] In the case of a generally H-shaped web structure, where two centering teeth are positioned between the legs of the "H", it can be considered to have at least one gap, and then at least one gap can be considered to be sized to accommodate the presence of a bracket closure.

[0036] Many bracket types have a locking lever or another closing element that protrudes slightly off-center, at the top or bottom, left or right. The instrument must have a corresponding recess at this location, which is released by the centering tooth, allowing the instrument to accommodate such a bracket.

[0037] In a preferred embodiment, the handle portion of the instrument maintains a straight extension of the retaining element that engages the bracket slot. Thus, the entire instrument extends orthogonally to the placement of the bracket on the tooth surface. This design feature provides a significant advantage over conventional forceps because it allows for improved and more precise positioning during orthodontic procedures.

[0038] For in-situ placement of lingual brackets, an alternative design option is to incorporate an angled handle portion. In this case, the handle portion is preferably angled at approximately 90 degrees, providing a convenient and ergonomic grip for the orthodontist. This angled configuration helps improve access and maneuverability when placing a lingual bracket positioned on the inside of a tooth.

[0039] To further enhance the positioning process, in a preferred embodiment, it is advantageous for the instrument to include an integrated positioning laser. The integration of a positioning laser provides the orthodontist with a visual aid that aids in the precise placement of the bracket. The laser emits a focused beam or projection that helps to accurately align the instrument on the tooth surface and ensure optimal bracket positioning.

[0040] In a preferred embodiment, the positioning laser is designed as a cross laser.

[0041] When the bracket is applied to the front of the teeth, the cross laser produces projected linear marks. These marks extend to the right and left of the bracket slot, and up and down in orthogonal directions. Using the cross laser enables the orthodontist to visually align the bracket precisely in the desired position.

[0042] Laser lines projected on the right and left sides of the bracket slots are used to achieve the purpose of precisely adjusting the height of the bracket position relative to the previously placed bracket. By visually aligning the position of the bracket along these laser lines, the orthodontist can ensure that the bracket is positioned at the desired height, maintaining consistency and proper alignment throughout treatment.

[0043] Furthermore, precise alignment of the bracket slot angles facilitated by the laser line is critical to producing the desired treatment arc and ensuring friction-free wire guidance.

[0044] In addition, laser lines projected upward and downward by the cross laser allow for centering of the carriage on a specific tooth while taking into account the position of the adjacent teeth in both the upper and lower rows. By utilizing these laser beams, any angular positioning errors can be easily identified and corrected.

[0045] This comprehensive alignment assessment ensures that the bracket is precisely positioned in the center of the tooth, taking into account the surrounding teeth in the dental arch. The laser line acts as a visual guide, allowing the orthodontist to detect and correct any angular positioning discrepancies, ensuring accurate bracket placement and facilitating optimal treatment outcomes.

[0046] In a preferred embodiment, the instrument includes a transition section that is specifically designed to accommodate these cross-shaped laser beams. The transition section features at least four recesses that are strategically positioned to allow the laser beam to exit and project the necessary cross-shaped markings. These recesses are carefully placed to ensure optimal visibility and alignment of the laser line during bracket placement.

[0047] In this context, the transition section is preferably designed to taper conically towards the head section.

[0048] In a preferred configuration, the transverse laser is positioned at the head side end of the handle portion. It incorporates an optical system that is specifically designed to enable the four beams of the cross laser to be emitted through the recess present in the transition portion. This carefully designed optical system ensures that the laser beams are efficiently projected and accurately aligned, thereby producing the required cross-shaped markings for accurate bracket placement.

[0049] In addition, the cross laser integrated into the instrument can emit light in various colors: blue, red, or green. Notably, non-red light colors generally provide better contrast to the gingival structures, enhancing visibility and facilitating precise positioning of the bracket. In addition, the orthogonal directions of the cross laser can be distinguished by employing different light colors, further facilitating precise alignment and orientation of the bracket on the tooth surface.

[0050] In a preferred configuration, the head portion of the instrument, with or without a transition portion, can be designed to be interchangeable, thereby enabling the instrument to be conveniently customized to accommodate various types of brackets. This interchangeability feature enhances the versatility and adaptability of the instrument, thereby facilitating its use across different orthodontic procedures and bracket systems. By easily replacing the head, the orthodontist can seamlessly transition between different bracket types, ensuring optimal functionality and compatibility with specific treatment requirements.

[0051] Furthermore, this design allows for direct sterilization of the head, thus ensuring optimal hygiene during orthodontic procedures. It eliminates the need to sterilize the entire instrument, including the handle portion and the integrated cross laser, as they are not directly exposed to the treatment area. By focusing the sterilization process on the easily removable and sterilizable head, the instrument can be effectively maintained under sterile conditions while minimizing potential damage or destruction to the delicate components of the cross laser and its power supply. This improved sterilization method enhances infection control protocols and reduces the risk of cross contamination, thus ensuring the highest standards of patient care in orthodontic practices.

[0052] Furthermore, the cross laser can be conveniently powered by integrating a battery or rechargeable accumulator in the instrument handle section. This eliminates the need for a wired power supply connected to the treatment chair unit, which is usually used for other dental instruments. In view of the relatively low power consumption of laser diodes in positioning lasers, the use of an integrated battery or accumulator provides a practical and effective solution. This independent power supply system ensures greater flexibility and ease of use during orthodontic procedures, allowing unlimited movement and positioning of the instrument without the restrictions of a wired connection.

[0053] Activation of the positioning laser or the cross laser is achieved by using a switch integrated into the instrument, which may be designed as a rotary switch or any other suitable type of switch. Laser power and focusing parameters are carefully selected to ensure eye safety, aiming to achieve an approximate laser protection class of 1 or 2. This ensures that the emitted laser beam poses minimal risk to the eyes of both the orthodontist and the patient during the bracket placement procedure.

[0054] Safety precautions and adherence to laser protection guidelines are extremely important to protect the health of all individuals involved in orthodontic treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The present invention will be described in more detail below with reference to the examples shown in the accompanying drawings.

[0056] Figure 1a A schematic diagram showing the instrument according to the present invention when positioning a dental bracket;

[0057] Figure 1b Shows something like Figure 1a but with the bracket attached obliquely / at an angle;

[0058] Figure 2 is a perspective view of the head of the instrument including the transition portion according to the present invention, as a top view;

[0059] Figure 3a Shown according to Figure 2 Plan view of the head;

[0060] Figure 3b Shown along Figure 3a A cross-sectional view of line AA;

[0061] Figure 4 As a bottom view Figure 2 A stereogram of the head;

[0062] Figure 5a shows a schematic cross-section through an instrument according to the invention with an attached bracket temporarily secured by wax;

[0063] Figure 5b Shown along Figure 5a A schematic cross-sectional view of line BB;

[0064] Figure 6 shows a schematic cross-section through an apparatus according to the invention for illustrating the application and separation process of a bracket; and

[0065] Figure 7 A schematic diagram of an alternative embodiment of an instrument according to the present invention is shown, which is particularly suitable for providing a lingual bracket. DETAILED DESCRIPTION

[0066] Figure 1a A highly schematic illustration of the instrument 10 according to the invention is shown when a dental bracket 18 to be placed is applied to the tooth fronts of teeth in a row of teeth, wherein the teeth are referenced with 16 and the handle portion is referenced with 12 .

[0067] It should be emphasized that the schematically shown bracket 18 is only an example and that the invention is intended to be applicable to a variety of bracket types available on the market (both for vestibular and for lingual applications), optionally with correspondingly adapted instrument heads, wherein the necessary prerequisite is that the bracket to be provided has a horizontal recess for receiving the wire, the so-called bracket slot 22.

[0068] exist Figure 1a In the embodiment, in addition, in the bracket 20 adjacent to the bracket 18 to be replaced, it is also schematically indicated that the bracket 20 has a bracket closure 24, which is designed as a small rod arranged at the upper left. In addition, it is indicated that the bracket 20 can have an additional vertical slot 26 in the center; this varies between different bracket types.

[0069] The bracket 18 to be provided is held in a form-fitting manner by the head 14 of the instrument, optionally using a holding medium such as wax (see below), and placed on the pretreated (primed) tooth front provided with adhesive, and the adhesive is then cured.

[0070] Alternatively, particularly preferably, in the case of a lingual bracket, the instrument 10 can be used with the aid of a mandibular model in the context of an indirect bonding technique, as described above or known in the prior art.

[0071] A cross laser (46 in FIG. 5A ), which can be provided by a battery 32 or a battery integrated in the handle member 12 and can be switched on or off by the manipulator via a switch 34, generates vertical lines 28 ( Figure 1aOnly the line facing upward is shown in the figure) and vertical lines 28 generated to the right and left are used to facilitate precise positioning, wherein preferably green or blue is selected as the laser color in order to more clearly extract it from the gum color.

[0072] The bracket 18 to be arranged can be arranged precisely at the height of the adjacent bracket 20 already arranged by means of the horizontal laser line 30. In addition, the angle can be controlled very precisely (see Figure 1b error positioning in ).

[0073] By means of these vertical laser lines 28, alignment of the bracket 18 with respect to the associated tooth front 16 or with respect to the centre of the lower teeth or teeth of the lower teeth row can be ensured; moreover, angle control is also possible.

[0074] Such precise positioning is possible because the bracket 18 in the head 14 of the instrument 10 can be temporarily fixed in a defined position in a form-fitting (but removable) manner so that the current position of the currently extended handle portion 12 corresponds to the cross laser with the position of the bracket 18 to be set.

[0075] Figure 2 , Figure 3a , Figure 3b and Figure 4 A corresponding head portion 14 of the instrument is shown which is suitable for use with a number of common brackets.

[0076] The head section 14 opens into a rectangular area having various webs and projections which are adapted to the size and structure of the brackets to be provided and are to be understood here merely by way of example.

[0077] The web 50 engages in the bracket groove 22 of the bracket 18 to be placed. The web 50 can engage in the bracket groove 22 in a form-fitting manner, or the web 50 can have small dimensions so that a plurality of different bracket types with different groove widths can be arranged by the head 14 and then the bracket can be temporarily fixed with a retaining agent (such as wax).

[0078] The two legs 52 extend at the ends transversely to the web 50 , so that the head in this example has an H-shaped profile.

[0079] However, it is also conceivable to adapt other bracket types, for example a cross profile or a T-shaped profile (not shown).

[0080] Furthermore, two centering teeth 54 are arranged centrally in the intermediate space between the legs 52. In each case, a gap 56 remains laterally from the centering teeth to the legs 52. This gap is designed to receive a corresponding bracket closure 24 (which, if present, can also always be arranged in a corner) and thus brings additional stability.

[0081] The tapered transition portion 40 faces the handle portion 12 ( Figures 2 to 4 The conical transition section has four recesses or grooves 44 for the exit of the laser beam of a cross laser source 46 (not shown in detail). As is basically known in the prior art, the cross laser source 46 is based on one or more laser diodes with corresponding cross beam optics.

[0082] In the subsequent part of the transition part 40 in the direction of the handle 12, a connecting piece 42 is provided, which has a rotationally fixed tooth structure 48 on the inside, which can interact with the corresponding structure of the handle part (not shown). The tooth structure preferably has an angle coding structure (not shown) (for example, a thickened rib), which allows the head to be placed on the handle part only at an angular distance of 90 ° or 180 °, or is simply placed at a single angle position. If a cross laser light source 46 is accommodated in the handle part 12 to ensure the correct alignment of the laser, this is advantageous. This design makes it possible to pull the head part 14 away from the handle part 12 and sterilize the head part separately. In addition, the head part 14 can be simply replaced with different types of head parts for different bracket types.

[0083] exist Figure 3a In the figure, two arrows 66 indicate the direction of application of possible additional compressive force, which is applied by the legs 52 through an optional spring-loaded mechanism (not shown) to further secure the bracket to be installed in a clamp or tweezer-like manner during bracket application. In this optional embodiment, these legs 52 should be slightly spaced from the web 50, or should have an integral slot to allow the web 50 to pass through, so that these legs can move a certain distance in the direction of arrows 66, whereby these details of the spring-loaded mechanism are not shown.

[0084] Figure 5a and Figure 5b It is schematically shown how the bracket 18 to be arranged can be temporarily fixed with wax (shaded area 60 ).

[0085] exist Figure 5b It can also be seen how the bracket closure 24 is received by the gap 56.

[0086] Figure 6 The bracket setting process is schematically shown at a stage shortly before the bracket 18 is applied to the front part of the teeth 16 (illustrated in dashed lines) and after placement (illustrated in non-dashed lines), wherein the adhesive layer is indicated by 62 .

[0087] exist Figure 6 Also visible are the cross laser rays 28 and 30.

[0088] Figure 7 An alternative embodiment of the instrument 10 ′ according to the invention is shown, in which the head portion 14 (and therefore also the web 50 engaged in the bracket groove) is angled at approximately 90° relative to the handle portion 12 in the angular transition region 64, so that in situ application of the lingual bracket 18 is also possible, as Figure 7 shown.

[0089] In this embodiment, the transition portion 40 extends from the side surface of the handle portion 12 with an integrated cross laser 46 and exit slot 44 .

[0090] Of course, other angles than 0° or 90° are also conceivable between the head portion 14 and the handle portion 12; if appropriate, the angle can also be designed to be adjustable by means of an adjustable and fixable joint (not shown).

[0091] Reference numerals list

[0092] 10, 10′ instrument

[0093] 12 Grip

[0094] 14Head

[0095] 16 Front part of teeth

[0096] 18Dental brackets ready for use

[0097] 20 adjacent brackets

[0098] 22 bracket slots

[0099] 24 bracket closure

[0100] 26 vertical bracket slots

[0101] 28 Cross laser beams at top / bottom

[0102] 30 right / left cross laser beams

[0103] 32 batteries

[0104] 34 switches

[0105] 40 Transition section

[0106] 42 Attachments

[0107] 44 laser output slots

[0108] 46 cross laser light source

[0109] 50 strokes

[0110] 52 Legs

[0111] 54 Centering teeth

[0112] 56 Gap

[0113] 60 Fixing wax

[0114] 62 Adhesive

[0115] 64-angle transition area

[0116] 66 Arrows

Claims

1. An apparatus (10) for setting a dental bracket (18), wherein: The instrument (10) is in a releasable form-fitting connection with the structure of the bracket (18) to be placed during the setting process, wherein the instrument (10) further comprises a handle portion (12) and a head portion (14), wherein the head portion is designed to hold the bracket (18) to be placed, It is characterized in that The form-fit connection is at least partially achieved by at least one retaining element (50) arranged on the head portion (14), the retaining element being designed to retain the bracket (18) by engaging into a bracket groove (22) of the bracket (18) to be placed; The head part (14) is designed to be replaceable.

2. The apparatus (10) according to claim 1, characterized in that The head section (14) has a web (50) which is designed to engage in the bracket groove (22) on the end side.

3. The apparatus (10) according to claim 2, characterized in that The web (50) is delimited at its two ends by two substantially transversely arranged legs (52), thereby forming a substantially H-shaped web structure, wherein the web (50) can be continued on one or both sides in connection with the legs (52).

4. The apparatus (10) according to claim 3, characterized in that The transversely arranged legs (52) are movable primarily in the direction of the web (50), and a compressive force can be applied to both legs to further secure the bracket (18) to be placed.

5. The apparatus (10) according to claim 2 or 3, characterized in that The web (50) is penetrated approximately centrally or at the ends by legs arranged approximately transversely, thereby forming an approximately plus-shaped or T-shaped web structure.

6. The apparatus (10) according to claim 5, characterized in that Above and / or below the web (50), one or two centering teeth (54) are arranged approximately centrally relative to the longitudinal extension of the web (50) and are spaced apart from the web (50).

7. The apparatus (10) according to claim 6, characterized in that An approximately H-shaped web structure having a total of two centering teeth (54) is provided between the legs of the "H", wherein at least one of the gaps (56) is sized according to the side of the centering teeth (54) for receiving a bracket closure (24).

8. The apparatus (10) according to claim 1, characterized in that The gripping portion (12) extends in a straight extension of the holding element (50) or at an angle of 90° relative to the direction of the holding element.

9. The apparatus (10) according to claim 1, characterized in that The instrument has an integrated positioning laser (46).

10. The apparatus (10) according to claim 9, characterized in that The positioning laser (46) is designed as a cross laser, which can generate horizontal laser lines (30) on the left and right sides (30) of the bracket slot (22) when the bracket (18) is applied to the front of the tooth, and generate vertical laser lines (28) orthogonal to the horizontal laser lines (30).

11. The apparatus (10) according to claim 10, characterized in that A transition portion (40) is arranged between the head portion (14) and the handle portion (12), wherein the transition portion (40) has at least four recesses (44) for the emission of a cross laser beam.

12. The apparatus (10) according to claim 11, characterized in that The transition portion (40) is designed to taper conically toward the head portion (14).

13. The apparatus (10) according to any one of claims 9 to 12, characterized in that A cross laser (46) is arranged at the head side end of the handle portion (12).

14. The apparatus (10) according to claim 13, characterized in that The positioning laser (46) is designed to emit blue light and / or red light and / or green light.

15. The apparatus (10) according to claim 1, characterized in that The head portion (14) includes a transition portion (40).

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