Positioning aid, system and procedure for it

Abstract

The present invention relates to a positioning aid (10) for positioning a wire (56) of an orthodontic appliance (54) on a dental model (52), wherein the positioning aid (10) comprises a piercing element (12) for piercing the dental model (52) and a positioning element (14) for positioning the wire (56) on the dental model (52). The present invention further relates to a system (50) comprising a dental model (52), an orthodontic appliance (54), and a positioning aid (10). The present invention further relates to a method (100) for positioning a wire (56) of an orthodontic appliance (54) on a dental model (52) using a positioning aid (10).

Description

[0001] The present invention relates to a positioning aid for positioning a wire of an orthodontic appliance on a dental model. The present invention further relates to a system comprising a dental model, an orthodontic appliance, and such a positioning aid. The present invention also relates to a method for positioning a wire of an orthodontic appliance on a dental model using a positioning aid.

[0002] It is known in the prior art to use a dental model for the fabrication of an orthodontic appliance. In particular, the orthodontic appliance can be manufactured on a dental model.

[0003] An orthodontic appliance is used to treat misalignments of the jaws and teeth in patients. A variety of different orthodontic appliances are known in the art, for example, removable appliances, fixed appliances, braces, retainers, and the like. In particular, orthodontic appliances can have at least one wire. Such appliances can be described as wire-fixed or wire-based appliances.

[0004] In this context, a dental model refers to a model of a dentition or jaw, particularly a patient's dentition or jaw. A dental model can also be called a dental model. Dental models in the form of plaster casts are particularly common. Furthermore, dental models can also be produced using 3D printing, for example, from plastic. A 3D-printed dental model can also be called a filament model.

[0005] For the production of special orthodontic appliances, it may be necessary to position guides or positioning aids for the wire to be bent on the tooth model to ensure a precise fit.

[0006] For example, publication EP 2 258 304 A1 describes a manufacturing process for an orthodontic clasp with a positioning guide, in which a first dental photopolymer is thinly applied as a base material to a bonding surface of each orthodontic clasp, which is attached to an orthodontic wire. A second dental photopolymer, exhibiting adhesive properties to the first dental photopolymer, is built up on the bonding surface of the orthodontic clasp. The bonding surface is then bonded to a tooth surface of a dental plaster model, which replicates a patient's dentition, after a release agent has been applied to the tooth surface of the dental plaster model. The first and second dental photopolymers are then polymerized.A third dental photopolymer is applied thinly around the orthodontic clasp on the dental plaster model, and this third photopolymer is slightly rubbed off when occlusal pressure is applied. The third photopolymer is then polymerized so that it bonds at least with the second photopolymer.

[0007] Furthermore, it is also known to use plaster models as dental models for the fabrication of orthodontic appliances, in which a positioning opening for the wire is already formed. For this purpose, for example, an alginate impression of the jaw or dentition can be taken of the patient with a molar band attached. The band can be positioned in the alginate with a positioning opening closed by a small L-shaped metal piece. After the plaster impression of the dental model has been made, the metal piece can then be removed and the appliance fabricated. Furthermore, US Patent 2024 / 0238069 A1 discloses a method for manufacturing a transfer device, comprising providing a physical model with a shape corresponding to a positive form of a patient's dental arch and one or more support assemblies, each comprising a crane body detachably connected to an orthodontic appliance. A transfer device can be formed over the physical model, the transfer shell being a negative replica of at least a portion of the model. Using the transfer device, the appliance can be placed on a patient's dental arch. Subsequently, the appliance can be detached from the crane body and connected to the corresponding tooth. Furthermore, the publication DE 20 2010 001 323 U1 shows a system for positioning orthodontic brackets. Furthermore, the publication DE 603 ​​20 498 T2 shows a device for orthodontic correction.

[0008] However, the known devices, systems and procedures still leave room for improvement, especially regarding the simplicity and accuracy in the manufacture of an orthodontic appliance.

[0009] Against this background, it is an object of the present invention to provide an improved positioning aid, an improved system, and an improved method for positioning a wire of an orthodontic appliance on a dental model. In particular, it is an object of the present invention to improve the manufacture of an orthodontic appliance, especially with regard to simplicity and accuracy.

[0010] According to a first aspect of the present invention, a positioning aid is provided for positioning a wire of an orthodontic appliance on a dental model, wherein the positioning aid has a piercing element for piercing into the dental model and a positioning element for positioning the wire on the dental model.

[0011] According to a second aspect of the present invention, a system comprising a dental model, an orthodontic appliance and a positioning aid according to the first aspect of the invention is provided.

[0012] According to a third aspect of the present invention, a method for positioning a wire of an orthodontic appliance on a dental model is provided by means of a positioning aid, wherein the positioning aid comprises a piercing element and a positioning element, wherein the method comprises the following steps: - Inserting the insertion element into the tooth model; and - Positioning the wire on the tooth model using the positioning element.

[0013] The procedure according to the third aspect can be carried out using the system according to the second aspect.

[0014] The orthodontic appliance consists of a wire that must be positioned on the dental model during fabrication. The wire can be guided close to the teeth or on the palate. The orthodontic appliance can be designed for rotation or expansion. It can be positioned lingually or palatally (tongue-side or palate-side), or labially or vestibularly (lip-side or cheek-side). Specifically, the orthodontic appliance can be a transpalatal arch, a quad helix, a nance, a pendulum, or a labial arch.

[0015] The positioning aid according to the invention serves to position the wire of the orthodontic appliance. The positioning aid comprises the insertion element and the positioning element. Preferably, the insertion element is connected to the positioning element. In particular, the positioning aid can be formed in one piece or integrally shaped.

[0016] The insertion element is used for insertion into the dental model. In other words, the insertion element can be inserted into the dental model. In particular, the insertion element can be inserted into the dental model at a specific position. The insertion element preferably has a first end and a second end. The insertion element can extend from the second end to the first end. The first end preferably serves for insertion into the dental model. For this purpose, the first end can, for example, be relatively thin or essentially pointed. The positioning element is preferably arranged at the second end. In particular, the insertion element extends from the second end to the first end in an insertion direction. In this insertion direction, the insertion element is inserted into the dental model. Before insertion, material can be removed from the dental model at the insertion point.

[0017] The positioning element is used to position the wire on the dental model. In other words, the appliance wire can be positioned on the dental model using the positioning element, especially when the insertion element is inserted into the dental model. Specifically, the wire can be positioned at a specific location on the dental model using the positioning element. Before positioning, the wire can be bent or pre-bent to fit precisely. The specific location could, for example, be a position on the lingual or labial surface of a first molar in the dental model. The first molar is the first large, multi-rooted back tooth.

[0018] According to the invention, the positioning aid can be inserted into the dental model at the desired position. The wire for the appliance can then be bent to fit precisely and positioned using the positioning element. This improves the arrangement of the positioning aid and the positioning of the appliance wire. In particular, the insertion element enables simple, precise, and stable placement of the positioning aid on the dental model. The wire can then be easily and accurately positioned on the dental model using the positioning element. This improves the fabrication of the orthodontic appliance, especially with regard to simplicity and accuracy. Furthermore, the positioning aid can be removed and reused after completion of the laboratory work.

[0019] The task posed at the beginning is thus fully solved.

[0020] In a first embodiment according to one of the aspects or one of its embodiments, the piercing element can be rod-shaped, in particular needle-shaped.

[0021] In particular, the diameter of the insertion element can be larger at the second end than at the first end. This makes it especially easy to insert the insertion element into the dental model.

[0022] In a further embodiment according to one of the aspects or one of its embodiments, the positioning element can have a through-opening into which the wire of the apparatus can be inserted in order to position the wire on the dental model.

[0023] The through-hole can also be referred to as the insertion opening. By inserting the wire into the through-hole, it can be positioned particularly easily on the dental model using the positioning aid.

[0024] In a further embodiment according to one of the aspects or one of its embodiments, the positioning aid can have at least one retaining element, in particular two retaining elements, for holding or securing the positioning aid to the tooth model.

[0025] The retaining elements thus serve to further secure the positioning aid to the dental model once it has been inserted. This allows the positioning aid to be attached to the dental model even more stably. In a preferred embodiment, the positioning aid has two retaining elements. These retaining elements can be arranged, particularly in a direction perpendicular to the insertion direction, on two opposite sides of the insertion element.

[0026] In a further embodiment according to one of the aspects or one of its embodiments, each retaining element can be arranged on the positioning element and / or on a side of the insertion element on which the positioning element is arranged.

[0027] In particular, each retaining element is located on the positioning element or at the second end of the insertion element. This allows the insertion element to be inserted almost completely into the dental model, and each retaining element then holds the positioning aid securely in this position. This allows the positioning aid to be attached to the dental model even more stably.

[0028] In a further embodiment according to one of the aspects or one of its embodiments, each retaining element can be hook-shaped.

[0029] In this way, the positioning aid can be held particularly easily and stably on the dental model. Preferably, each retaining element can extend from the positioning element and / or the second end of the piercing element in the piercing direction. In particular, each retaining element can be bent from the positioning element and / or the second end of the piercing element towards the first end of the piercing element.

[0030] In a further embodiment according to one of the aspects or one of its embodiments, the positioning aid can consist of, be made of, or be manufactured from a metal, in particular a metal alloy.

[0031] The material from which the positioning aid is made can therefore be a metal, preferably a metal alloy. For example, the material can be a CoCr alloy, in particular ground CoCr. The positioning aid can be manufactured from this material. In this way, the positioning aid is temperature-stable and has high strength.

[0032] In a further embodiment according to one of the aspects or one of its embodiments, the positioning aid can be manufactured using an additive process.

[0033] In this way, the positioning aid can be designed and manufactured particularly easily as a single piece. For example, the positioning aid can be manufactured using a beam melting process, especially a laser beam melting process (also called "laser melting"). The laser beam melting process is based on the powder bed-based melting of metal using a laser beam. The metal can be a metal alloy, especially a CoCr alloy.

[0034] In a further embodiment according to one of the aspects or one of its embodiments, the dental model can consist of a thermoplastic material, in particular plastic.

[0035] In particular, the dental model can be made of or manufactured from a thermoplastic material. This makes it especially easy to insert the positioning aid into the dental model, particularly when the insertion element is heated. The thermoplastic material can be, in particular, GreenTEC Pro Es.

[0036] In a further development according to one of the aspects or one of its developments, the dental model can be produced using an additive process.

[0037] In this way, the impression-taking process, which some patients find unpleasant, using impression material, especially alginate, and metal impression trays, can be eliminated. Any potential gag reflex is also avoided. An intraoral scan can be performed first to create the additive manufacturing of the dental model. The intraoral scan can be done with or without a molar band. An intraoral scan is a digital impression of the patient's oral cavity. For example, the dental arches can be scanned using a small camera and captured as digital data. In particular, the intraoral scan can capture a 3D model of the patient's oral cavity, including the teeth, palate, and soft tissues. Based on the intraoral scan, and especially on the captured 3D model, the dental model can then be manufactured using the additive manufacturing process.For example, the dental model can be manufactured from a thermoplastic base material using an additive manufacturing process such as stereolithography (SLA) or digital light processing (DLP). The base material can be a filament with an outer layer thickness of three layers and a loose internal support structure. The material is preferably heat-resistant up to 160 °C. This allows the positioning aid, when the insertion element is heated, to penetrate the material particularly easily and be placed at the desired position. The base material can, in particular, be GreenTEC Pro Es. Preferably, the position where the positioning aid is to be placed on the dental model can be marked on the model during additive manufacturing, for example, in the form of a small recess.

[0038] In a further embodiment according to the third aspect or one of its embodiments, the procedure may further include the following step: - Heating the insertion element, whereby in the insertion step the heated insertion element is inserted into the tooth model. Alternatively, the positioning aid can also be glued without the insertion element.

[0039] This makes it easier to insert the insertion element into the dental model. Preferably, the heating step takes place immediately before the insertion step. In particular, if the dental model is made of a thermoplastic material, the heated insertion element can be inserted into the dental model very easily.

[0040] In a further embodiment according to the third aspect or one of its embodiments, the procedure may further include the following step: - Determining an arrangement of the positioning aid on the dental model, whereby in the insertion step the insertion element is inserted into the dental model in the determined arrangement.

[0041] This further improves the positioning of the positioning aid and, consequently, the positioning of the wire on the dental model. The arrangement of the positioning aid can specify its position and / or orientation on the dental model. This arrangement can be determined, for example, based on the design of the orthodontic appliance and / or the position of the actual guide in the patient's mouth. Specifically, the position at which the positioning aid should be placed on the dental model is determined. Alternatively or additionally, the orientation in which the positioning aid should be placed on the dental model can also be determined. The specified position might, in particular, be on the lingual or labial surface of a first molar in the dental model.

[0042] In a further embodiment according to the third aspect or one of its embodiments, the procedure may further include the following step: - Marking the specific arrangement on the tooth model.

[0043] Preferably, the marking is done before the insertion into the dental model. This improves the accuracy and ease of insertion and, consequently, the positioning of the positioning aid. In particular, if the dental model is manufactured using an additive manufacturing process, the marking of the specific arrangement can be carried out as part of the additive manufacturing process.

[0044] In a further embodiment according to the third aspect or one of its embodiments, the positioning element can have a through-opening, wherein in the positioning step the wire is inserted into the through-opening in order to position the wire on the tooth model.

[0045] By inserting the wire into the through-hole, the wire can be easily positioned on the dental model using the positioning aid. Furthermore, inserting the positioning aid at a specific location on the dental model also allows for precise adjustment of the through-hole's orientation. Specifically, determining the positioning aid's position on the dental model allows for precise control over both the aid's position and the orientation of the through-hole. This further improves the positioning and guidance of the orthodontic appliance wire.

[0046] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or on their own, without leaving the scope of the present invention.

[0047] Exemplary embodiments of the invention are shown in the drawing and are explained in more detail in the following description. They show: Fig. 1 an isometric view of an embodiment of a positioning aid; Fig. 2 the first side view of the positioning aid Fig. 1 along a first direction; Fig. 3 a second side view of the positioning aid Fig. 1 along a second direction; Fig. 4 a schematic view of a tooth model; Fig. 5 the view from Fig. 4 with a positioning aid attached to the tooth model; Fig. 6 the view from Fig. 4 with an orthodontic appliance positioned on the dental model; and Fig. 7 a schematic view of an embodiment of a method.

[0048] The Fig. 1, Fig. 2 to Fig. Figure 3 shows an embodiment of a positioning aid, designated in its entirety by reference numeral 10. The positioning aid 10 serves to position a wire of an orthodontic appliance on a dental model. For this purpose, the positioning aid 10 comprises a piercing element 12 and the positioning element 14. The piercing element 12 serves to pierce the dental model, for example, at a specific position on the dental model. The positioning element 14 serves to position the wire on the dental model.

[0049] The positioning aid 10 consists of a metal, in particular a metal alloy, for example a CoCr alloy. The piercing element 12 is connected to the positioning element 14. In particular, the positioning aid 10 is formed in one piece. The positioning aid 10 can be manufactured, for example, by an additive manufacturing process, such as a laser beam melting process.

[0050] The insertion element 12 extends in an insertion direction 16. The insertion element 12 can be inserted into the dental model, particularly in the insertion direction 16. A first direction 18 and a second direction 20 run perpendicular to the insertion direction 16. The first direction 18 and the second direction 20 are perpendicular to each other.

[0051] The piercing element 12 has a first end 22 and a second end 24. The piercing element 12 extends in the piercing direction 16 from the first end 22 to the second end 24. The first end 22 serves to pierce the tooth model. For this purpose, the first end 22 can be relatively thin or essentially pointed. The positioning element 14 is arranged at the second end 24. In particular, the positioning element 14 is connected to the piercing element 12 at the second end 24. The piercing element 12 is rod-shaped, in particular needle-shaped. The diameter of the piercing element 12 is larger at the second end 24 than at the first end 22. In particular, the diameter of the piercing element 12 decreases in the piercing direction 16 from the first end 22 to the second end 24.

[0052] The positioning element 14 serves to position the wire on the dental model, particularly when the insertion element has been inserted into the dental model. The positioning element 14 has a through-opening 26. The wire of the apparatus can be inserted into the through-opening 26 to position the wire on the dental model. The through-opening 26 extends through the positioning element 14 in the first direction 18.

[0053] The opening 26 has a substantially constant cross-sectional area in the first direction 18. The opening 26 has a width in the second direction 20. The opening 26 has a height in the insertion direction 16. The width of the opening 26 is greater than the height of the opening 26.

[0054] The positioning element 14 is essentially cuboid in shape. The sides of the cuboid are oriented according to directions 16, 18, and 20. Each pair of sides is perpendicular to one of these directions. The positioning element 14 has a length in the first direction 18. The positioning element 14 has a width in the second direction 20. The positioning element 14 has a height in the insertion direction 16. The length of the positioning element 14 is greater than the width of the positioning element 14. The width of the positioning element 14 is greater than the height of the positioning element 14.

[0055] The positioning aid 10 has at least one retaining element 28. In the illustrated embodiment, the positioning aid 10 has two retaining elements 28. Each retaining element 28 serves to hold the positioning aid 10 on the dental model. When the positioning aid 10 is inserted into the dental model, the retaining elements 28 serve in particular to additionally hold the positioning aid 10 on the dental model. The two retaining elements 28 are arranged in the first direction 18 on two opposite sides of the insertion element 12. The retaining elements 28 are arranged at the second end 24 of the insertion element 12 and on the positioning element 14.

[0056] Each retaining element 28 extends in particular from the second end 24 of the piercing element 12 in the piercing direction 16 and the first direction 18. In particular, each retaining element 28 is bent from the second end 24 of the piercing element 12 towards the first end 22 of the piercing element 12. This gives each retaining element 28 a hook-shaped form.

[0057] The Fig. 4, Fig. 5 to Fig. Figure 6 shows an embodiment of a system in its entirety designated by reference numeral 50. The system 50 comprises a tooth model 52, an orthodontic appliance 56, and a positioning aid 10. The orthodontic appliance 56 includes a wire 58. The system 50 may optionally also include a further positioning aid 10'. The positioning aids 10 and 10' can be configured according to the embodiment of the positioning aid as shown in Figure 6. Fig. 1, Fig. 2 to Fig. 3. In Fig. Figure 4 shows only tooth model 52. Fig. Figure 5 shows the tooth model 52 and the positioning aids 10, 10'. Fig. Figure 6 shows the dental model 52, the orthodontic appliance 56 and the positioning aids 10, 10'.

[0058] System 50 is used in particular for the production of the orthodontic appliance 56. In particular, the wire 58 can be positioned on the tooth model 52 using System 50.

[0059] First, the dental model 52 is provided. The dental model 52 can be manufactured, for example, from a thermoplastic material, preferably using an additive manufacturing process. The production of the dental model 52 can, for example, be based on an intraoral scan of the patient's oral cavity.

[0060] A mark 54 is then placed on the tooth model 52. This is in Fig. Figure 4 illustrates this. The marking 54 serves to indicate the arrangement of the positioning aid 10 on the dental model 52. In particular, the marking 54 is intended to indicate a specific position of the positioning aid 10 on the dental model 52 and, optionally, also a specific orientation of the through-hole 26 on the dental model 52. Preferably, the specific position of the positioning aid 10 can be on the lingual surface of a first molar 60 in the dental model 52. Alternatively, the specific position of the positioning aid 10 can also be on the libual surface of the first molar 60 in the dental model 52.

[0061] A further marking 54' can also be applied to the dental model 52. The marking 54' serves to indicate the arrangement of the further positioning aid 10' on the dental model 52. In particular, the marking 54' is intended to indicate a specific position of the positioning aid 10' on the dental model 52 and, optionally, also a specific orientation of the through-hole 26 on the dental model 52. Preferably, the specific position of the further positioning aid 10' can be on the lingual surface of the other first molar 60' in the dental model 52. Alternatively, the specific position of the further positioning aid 10' can also be on the libual surface of the other first molar 60' in the dental model 52.

[0062] The piercing element 12 of the positioning aid 10 is then heated and inserted at the mark 54. Specifically, the piercing element 12 is inserted at the mark 54 such that the positioning aid 10 is positioned at the specified location and, optionally, the through-hole is positioned in the specified orientation. This is in Fig. Figure 5 shows that when the insertion element 12 is inserted into the tooth model 52, the retaining elements 28 are at least partially pressed into the tooth model 52, thereby additionally holding the positioning aid 10 to the tooth model 52. Similarly, the further positioning aid 10' can also be inserted at the further marking 54' to position the further positioning aid 10'.

[0063] The wire 58 of the orthodontic appliance 56 is then positioned on the tooth model 52 using the positioning element 14 of the positioning aid 10. For this purpose, the wire 58 is inserted into the through-hole 26 of the positioning element 14. This is in Fig. Figure 6 is shown. Additionally, the positioning element 14 of the further positioning aid 10' can also be used to position the wire 58.

[0064] Fig. Figure 7 shows an embodiment of a method in its entirety designated by reference numeral 100. Method 100 serves to position a wire of an orthodontic appliance on a dental model using a positioning aid. Method 100 can be implemented using system 50 from the Fig. 4, Fig. 5 to Fig. 6. In particular, the wire 58 of the orthodontic appliance 56 can be positioned on the tooth model 52 using the positioning aid 10 with the method 100.

[0065] In step 102 of procedure 100, the insertion element 12 is inserted into the dental model 52. Before insertion, material can be removed from the insertion point of the dental model 52. To handle the positioning aid 10 for insertion, a tool, such as a hand instrument, can be used to hold and move the positioning aid 10. The hand instrument can, for example, have a handle and a T-shaped end. The T-shaped end can be rounded and adapted to the inner dimension of the through-hole 26. The T-shaped end is specifically designed so that each side of the "T" can be inserted into the through-hole 26. Furthermore, such a hand instrument also allows for easy removal of the positioning aid 10.

[0066] In a further step 104 of the procedure 100, the wire 58 is positioned on the dental model 52 using the positioning element 14. Specifically, the wire 58 can be inserted into the through-hole 26 to position it on the dental model 52. Step 104 follows step 102. Specifically, the insertion element 12 is inserted into the dental model 52 while step 102 is being performed.

[0067] In a further optional step 106 of the procedure 100, the insertion element 12 is heated, and then in step 102 the heated insertion element 12 is inserted into the tooth model 52. Step 106 thus takes place before step 102.

[0068] In a further optional step 108 of the procedure 100, an arrangement of the positioning aid 10 on the dental model 52 is determined, wherein in step 102 the insertion element 12 is inserted into the dental model 52 in the determined arrangement. Step 108 thus takes place before step 102, and preferably also before step 106. The arrangement of the positioning aid 10 can include a position and / or orientation of the positioning aid 10 on the dental model 52. In particular, the position of the positioning aid 10 on the dental model 52 and the orientation of the through-hole 26 can be determined. The arrangement of the positioning aid 10 can, for example, be determined based on the design of the orthodontic appliance 56 and / or based on the position of the actual guide in the patient's mouth. The determined position can, in particular, be a position on the lingual or labial surface of a first molar 60, 60' in the dental model 52.

[0069] In a further optional step 110 of the procedure 100, the specific arrangement is marked on the tooth model 52. For this purpose, for example, the marking 54 can be applied to the tooth model. Step 108 thus takes place between step 108 and step 102, preferably before step 106.

Claims

[1] Positioning aid (10) for positioning a wire (58) of an orthodontic appliance (56) on a dental model (52), wherein the positioning aid (10) has a piercing element (12) for piercing into the dental model (52) and a positioning element (14) for positioning the wire (58) on the dental model (52). [2] Positioning aid (10) according to claim 1, wherein the insertion element (12) is rod-shaped, in particular needle-shaped. [3] Positioning aid (10) according to claim 1 or 2, wherein the positioning element (14) has a through-opening (26) into which the wire (58) of the apparatus (56) can be inserted in order to position the wire (58) on the tooth model (52). [4] Positioning aid (10) according to one of claims 1 to 3, wherein the positioning aid (10) has at least one retaining element (28), in particular two retaining elements (28), for holding the positioning aid (10) on the tooth model (52). [5] Positioning aid (10) according to claim 4, wherein each retaining element (28) is arranged on the positioning element (14) and / or on a side of the piercing element (12) on which the positioning element (14) is arranged. [6] Positioning aid (10) according to claim 4 or 5, wherein each retaining element (28) is hook-shaped. [7] Positioning aid (10) according to any one of claims 1 to 6, wherein the positioning aid (10) is made of a metal, preferably a metal alloy. [8] Positioning aid (10) according to any one of claims 1 to 6, wherein the positioning aid (10) is manufactured by an additive manufacturing process. [9] System (50) comprising a dental model (52), an orthodontic appliance (56) and a positioning aid (10) according to any one of claims 1 to 8. [10] System (50) according to claim 9, wherein the tooth model (52) consists of a thermoplastic material, in particular plastic. [11] System according to claim 9 or 10, wherein the tooth model (52) is produced by an additive manufacturing process. [12] Method (100) for positioning a wire (58) of an orthodontic appliance (56) on a dental model (52) using a positioning aid (10), wherein the positioning aid (10) comprises a insertion element (12) and a positioning element (14), wherein the method (100) comprises the following steps: - Insertion (102) of the insertion element (12) into the tooth model (52); and - Positioning (104) the wire (58) on the tooth model (52) using the positioning element (14). [13] Method (100) according to claim 12, wherein the method (100) further comprises the following step: - Heating (106) of the piercing element (12), wherein in the piercing step (102) the heated piercing element (12) is inserted into the tooth model (52). [14] Method (100) according to claim 12 or 13, wherein the method (100) further comprises the following step: - Determining (108) an arrangement of the positioning aid (10) on the dental model (52), wherein in the insertion step (102) the insertion element (12) is inserted into the dental model (52) in the determined arrangement. [15] Method (100) according to claim 14, wherein the method (100) further comprises the following step: - Marking (110) the specific arrangement on the dental model (52). [16] Method (100) according to any one of claims 12 to 15, wherein the positioning element (14) has a through-hole (26), wherein in the positioning step (104) the wire (58) is inserted into the through-hole (26) to position the wire (58) on the tooth model (52). [17] Method (100) according to any one of claims 12 to 16, wherein the tooth model (52) consists of a thermoplastic material, in particular plastic. [18] Method (100) according to any one of claims 12 to 17, wherein the tooth model (52) is produced by an additive process. [19] Method (100) according to any one of claims 12 to 18, wherein the positioning aid (10) is made of a metal, preferably a metal alloy. [20] Method (100) according to any one of claims 12 to 19, wherein the positioning aid (10) is produced by an additive process.

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