Use of a rod, use of two rods, and use of a drill

Abstract

The invention relates to the use of a rod, to the use of at least two rods, and to the use of a drill. The use of a rod serves to stabilise a tooth which is located in a jaw and has a vertically extending crack in a wall of the tooth, or to stabilise a tooth that is located in the jaw, is susceptible to cracking, and has a predisposition to developing a vertically extending crack in a wall of the tooth, wherein the wall comprises a vestibular wall and a palatal or lingual wall opposite the vestibular wall, wherein, in use, the rod is arranged horizontally in the tooth and provides bracing between the vestibular wall and the palatal wall or between the vestibular wall and the lingual wall.

Description

[0001] Use of a rod, use of at least two rods and use of a drill.

[0002]

[0001] The invention relates to the use of a rod, the use of two rods and the use of a drill.

[0003]

[0002] Teeth can suffer a tooth fracture. A tooth fracture is defined in particular as when a piece of the tooth breaks off, the tooth splinters, or a crack develops. A distinction is made in particular between vertical and horizontal tooth fractures. While horizontal fractures are often of traumatic origin, vertical fractures are primarily caused by parafunctional habits, especially bruxism. Clinically, these fractures can manifest as sensitivity to biting and fine hairline cracks in the enamel, dentin, and / or down to the pulp chamber. Teeth that are particularly prone to vertical fractures are those with large fillings and root canal-treated teeth.

[0004]

[0003] In the prior art, if a vertical tooth fracture is located in the upper third of the tooth, especially if the dental nerve is exposed, root canal treatment is performed. If the vertical tooth fracture is located in the middle third of the root, the tooth is usually extracted, and if the vertical tooth fracture is located in the lower third of the root, an apicoectomy is usually performed. In the prior art, fracture-prone teeth and teeth with hairline cracks are usually treated with onlays, overlays, partial crowns, and / or crowns. The aim is to distribute the masticatory load, in particular, by covering the remaining cusps of the tooth.

[0005]

[0004] In DE 10 2014 107 882 Al a K-wire securing system for securing a position of a K-wire inserted into at least one bone part is disclosed.

[0006]

[0005] Various dental drills are disclosed in the product catalog of the company “Mede Technik” (see Mede Technik: Implants & Accessories, Product Information 28.08.2023).

[0007]

[0006] EP 2 196 164 Bl discloses a dental drill set.

[0008]

[0007] JP 2014-061412 A discloses a dental surgical operating tray set. This includes, in particular, a positioning aid for a drill.

[0009]

[0008] JP 2022-001097 A discloses a dental prosthesis apparatus.

[0010]

[0009] The known techniques have the disadvantage that the final prosthetic restoration of a fractured or fracture-prone tooth always results in a significant loss of tooth structure. Furthermore, the costs of the known prosthetic restorations are very high. In addition, the crowning process is sometimes time-consuming, and during this time, fracture-prone teeth can fracture, which can lead to tooth loss.

[0011]

[0010] The object of the invention is to improve the prior art.

[0011] This object is achieved by using a rod to stabilize a tooth arranged in a jaw with a vertical crack in a wall of the tooth, or to stabilize a crack-prone tooth arranged in the jaw which has a predisposition for a vertical crack in a wall of the tooth, wherein the wall has a vestibular wall and a palatal or lingual wall opposite the vestibular wall, wherein in the case of use the rod is arranged horizontally on the tooth and provides bracing between the vestibular and the palatal wall or between the vestibular wall and the lingual wall.

[0012]

[0012] By using a rod to create a bracing of the palatal and / or lingual wall with the vestibular wall of a tooth, the stability of the tooth, which has a crack or is at risk of cracking, is advantageously restored.

[0013]

[0013] Further advantageously, a tooth braced with a rod according to the invention or a tooth at risk of cracking can be refilled using a filling material and, after bracing and filling, exhibits an almost complete restoration of the stability of the tooth, so that the patient can use it again in essentially normal conditions.

[0014]

[0014] Furthermore, by using the rod to create a bracing of the palatal and / or lingual wall with the vestibular wall, the probability of a crack occurring in a crack-prone tooth and / or the risk of crack propagation is advantageously reduced.

[0015]

[0015] Furthermore, the use of the rod according to the invention is advantageous in no way interfering with other prosthetic measures, so that the preparation and insertion of an onlay, overlay, partial crown or crown is easily possible.

[0016]

[0016] In particular, a key idea is that tooth stability is restored so that, despite a crack or despite a predisposition to a crack in a crack-prone tooth, the tooth can be restored in such a way that a patient can continue to use it.

[0017]

[0017] The following terms are explained:

[0018]

[0018] A “rod” is understood to be, in particular, a rod-shaped body. The rod has, in particular, a significantly greater longitudinal extent than its transverse extent. The rod, and especially a cross-section of the rod, can have a substantially circular cross-section. The cross-section can additionally or alternatively have at least one chamfer, be oval, and / or angular. An angular design of the rod advantageously provides torsional rigidity for a rod arranged on a tooth.

[0019]

[0019] The term "essentially" means that the feature applies in principle and minor deviations remain within the scope of the disclosure. Thus, "essentially round" means that the cross-section of the rod is fundamentally round, circular, or oval. Minor deviations from a round shape may occur for technical or other reasons.

[0020]

[0020] The rod can be pre-fabricated. The pre-fabrication can relate in particular to a thickness and / or a length. Additionally or alternatively, the rod can be adjustable in length, particularly using a tool. In this way, the rod is advantageously optimally adaptable to the size of a tooth to be treated.

[0021]

[0021] Finally, the tooth can have a conical shape, which advantageously inhibits a change in position of the rod in a bore channel, at least in one direction.

[0022]

[0022] A “tooth” is understood to be, in particular, a structure in the oral cavity of a vertebrate, especially a human. The rod is used according to the invention, in particular, on a premolar and / or molar located in the lower jaw and / or upper jaw of a vertebrate. Premolars or molars are understood to be, in particular, the four last teeth on each side of a lower jaw or upper jaw.

[0023]

[0023] A tooth has, in particular, an internal pulp in which the nerves, roots, and blood vessels run. A layer of dentin surrounds the pulp. The dentin is essentially surrounded above the gum line by enamel.

[0024] The transverse dimension of the tooth runs primarily along an axis that extends from the outside through the tooth into the oral cavity. The longitudinal dimension of the tooth is oriented primarily orthogonally to the transverse dimension of the tooth and the direction of tooth growth. The teeth are thus arranged essentially side by side in the jaw along their respective longitudinal dimensions.

[0024]

[0025] The teeth of the upper jaw have in particular a vestibular wall and a palatal wall opposite the vestibular wall, and the teeth of the lower jaw have in particular a vestibular wall and a lingual wall opposite the vestibular wall.

[0025]

[0026] The "vestibular wall" is specifically the outer surface of the tooth. Therefore, the vestibular wall refers specifically to the tooth wall that rests against the inner surface of the cheek.

[0026]

[0027] A "palatal wall" refers in particular to a tooth wall of the tooth which is located in the upper jaw and oriented towards the palate.

[0027]

[0028] Finally, a "lingual wall" is understood to be a wall of a tooth that is located in the lower jaw and is oriented towards the tongue.

[0028]

[0029] The tooth may have a crack. In naturally healthy teeth, bruxism can be a cause of a crack. Cracks also arise from large, direct restorations, primarily amalgam fillings, but also from other causes such as extensive carious lesions. Large fillings with reduced remaining tooth structure, as is particularly the case with two-surface and / or three-surface fillings (e.g., mesial-occlusal-distal fillings), can also be a cause of a crack. Furthermore, a tooth may develop a crack as a result of root canal treatment. The above list is for informational purposes only and is not exhaustive.

[0029]

[0030] The tooth may also be at risk of cracking, either additionally or alternatively.

[0030]

[0031] A "teeth at risk of cracking" is defined as a tooth, as described above, that exhibits a predisposition for cracking but does not yet have an established crack. A tooth at risk of cracking may also be partially fractured, provided that the fracture has not yet developed into a crack.

[0031]

[0032] Predisposition can arise from the current state of the tooth, which may have undergone root canal treatment and / or exhibits a particularly large carious lesion. Additionally or alternatively, a large filling can cause predisposition, especially a two-surface filling and / or a three-surface filling (e.g., a mesial-occlusal-distal filling) with reduced remaining tooth structure. Furthermore, bruxism can be a cause of predisposition. The indications for predisposition to cracking are not exhaustively listed.

[0032]

[0033] A "crack," also called a hairline crack, fissure, fracture, or tooth fracture, is a crack located in the enamel, essentially penetrating the enamel, in the dentin, and / or penetrating the dentin of a tooth. The crack is typically vertical on the tooth, running essentially parallel to the direction of tooth growth. A crack in a tooth extends along the longitudinal axis of the tooth.

[0033]

[0034] When using the rod on a cracked tooth, "stabilizing" refers specifically to restoring the tooth to a state in which it can absorb and transfer the forces generated during its use into the jawbone. This state may be preceded by an unstable tooth, potentially caused by a fracture or crack. When using the rod on a tooth prone to cracking, "stabilizing" means preventing the initiation and / or formation of a crack. Finally, when using the rod on a tooth prone to cracking, "stabilizing" means preventing crack propagation in a fractured tooth. In a stable state, the shape of the tooth is not altered, particularly under normal force.

[0035] A “use case” is understood in particular to mean that the rod is used in accordance with the invention and that stability of a tooth is achieved by means of bracing through the rod.

[0034]

[0036] The rod is arranged according to the invention, in particular, projecting from the vestibular wall to the palatal wall and / or from the vestibular wall to the lingual wall. In other words, according to its arrangement according to the invention, the rod is oriented on a tooth essentially horizontally and parallel to a jaw axis.

[0035]

[0037] A "brace" is understood to be, in particular, a supporting transverse connection between two tooth walls, especially the vestibular wall and the palatal wall and / or the vestibular wall and the lingual wall. A brace advantageously increases the stability of a tooth prone to cracking and / or a tooth with a crack.

[0036]

[0038] In one embodiment, the rod comprises metal. Additionally or alternatively, the rod can comprise ceramic, plastic, and / or a fiber-reinforced material, such as glass fiber. Additionally or alternatively, the use of a material that is not perceptible to a patient by taste, sensory, and / or smell, and in particular a biocompatible material, such as ceramic, plastic, and / or fiber-reinforced material, is advantageous. Advantageously, very high stability of the rod can be achieved by using metallic and / or fiber-reinforced materials. Due to its particularly tooth-colored appearance, a rod according to the invention, comprising ceramic, plastic, and / or fiber-reinforced material, is advantageously essentially imperceptible after completion of treatment.Particularly in the case of a rod made of ceramic, plastic, and / or fiber-reinforced material, the rod can be manufactured in various colors, especially different tooth shades. A rod containing metal, fiber-reinforced material, and / or plastic can generally be easily adapted to a specific length. Finally, all of the aforementioned materials are essentially accepted by the body without triggering an adverse reaction, such as an allergic reaction, to the rod or its material.

[0037]

[0039] In one embodiment, the rod has a diameter of up to 3 mm, and in particular 0.5 mm to 1.5 mm. Additionally or alternatively, the rod may have a length that exceeds the vestibular-palatal and / or vestibular-lingual extent of upper and lower premolars or molars, respectively, and which may in particular be 8 mm to 20 mm. The first end of a rod, when arranged in a tooth, is in particular located on the vestibular wall. Additionally or alternatively, the first end of a rod, when arranged in a tooth, may be located on the palatal and / or lingual wall.

[0038]

[0040] A rod can be prefabricated. Prefabrication advantageously allows for lower production and manufacturing costs. The prefabricated rod can be designed based on general, known conditions of the application site, such as the size of a molar and / or premolar. Additionally or alternatively, prefabrication can be based on specific conditions, such as the patient's tooth width. Prefabrication can affect the length and / or diameter of the rod.

[0039]

[0041] In one embodiment, the rod can have a cylindrical shape. A cylindrical rod, in particular, has a constant first diameter from a first end of the rod to an opposite second end. Advantageously, a cylindrical rod can be arranged on a tooth in any direction. Additionally, a drill corresponding to the cylindrical rod is not very complex, thus making the manufacture and use of a cylindrical rod advantageously simple.

[0040]

[0042] Additionally or alternatively, the rod can have a conical shape. A conical rod has, in particular, a first diameter at a first end, which decreases essentially constantly along a longitudinal extension of the conical rod, so that the conical rod has a second diameter at a second end opposite the first end. Using a conical rod advantageously optimizes the positioning of the rod in the tooth, since the rod can be inserted into a corresponding borehole to a predefined depth and thus positioned predictably. The conical rod generally cannot be extended beyond the pre-drilled hole in an insertion direction, provided the pre-drilled hole is optimally designed.Advantageously, the conical rod achieves a clamping fit in at least one of the corresponding drill holes, so that a force acting on the tooth is transferred directly to the remaining tooth walls and not to filling material or the like.

[0041]

[0043] Additionally or alternatively, the rod can be designed as a parallel-conical rod. A parallel-conical rod is characterized in that it has a first diameter in a first region and, at least in a second region, a second diameter that differs from the first diameter. In one embodiment, the parallel-conical rod has a constant first diameter, particularly in a first region which comprises a first end of the parallel-conical rod. In a second region, which adjoins the first region in the direction of the longitudinal extent of the parallel-conical rod, the parallel-conical rod has a diameter that decreases from the first diameter along its longitudinal extent in the second region.At the end of the second section, which in particular has a second end of the parallel-conical rod opposite the first end, the parallel-conical rod has a third diameter. A parallel-conical rod can also advantageously be inserted into the tooth at a predefined depth corresponding to a pre-drilled hole. Furthermore, advantageously, only the hole in the palatal or lingual wall of the tooth needs to be conical, while the pre-drilled hole in the vestibular wall can advantageously be cylindrical. Thus, the parallel-conical rod combines the advantages of the conical rod and / or the cylindrical rod described above.

[0042]

[0044] Finally, the rod can be designed as a threaded rod. The thread can extend along the entire length of the rod or be partial, such as in a section at a second end of the rod, opposite the first end. For use with the threaded rod, a thread can be machined into the pre-drilled hole in at least the lingual and / or palatal wall of the tooth. Additionally or alternatively, a thread can also be machined into the pre-drilled hole in the vestibular wall of the tooth, particularly with the additional use of a tap. By using a threaded rod and a corresponding thread in the vestibular wall of the tooth and / or in the palatal or lingual wall of the tooth, rotational stability of the rod attached to the tooth is advantageously achieved.

[0043]

[0045] In one embodiment, the second and / or third diameter of a parallel-conical rod and / or a conical rod is each up to 10% smaller, and in particular up to 0.01% to 3% smaller, than the first diameter. This advantageously ensures continued stability of the rod. Furthermore, optimal insertion of the rod into the vestibular wall as well as into the palatal and / or lingual wall of the tooth is advantageously achieved.

[0044]

[0046] In another embodiment, the bar can have a veneer, also called an end cap, at at least one end. The veneer can be permanently attached to the bar, clipped on, and / or screwed on. The veneer can have a larger diameter than the bar against which it rests. The veneer can be tooth-colored. Using a veneer can significantly reduce the visibility of the bar when positioned against a tooth. Furthermore, positioning of a bar with a veneer is optimized, as the bar cannot unintentionally slip further into the drill hole.

[0045]

[0047] In a further embodiment, the rod can have a sleeve. The sleeve can be slidable along a longitudinal axis of the rod. The sleeve can additionally or alternatively have a receptacle in which a root post can be placed. In this way, the rod can be firmly attached to a root canal of the tooth by means of a root post, thus further increasing the stability of the tooth. The slidability of the sleeve along the longitudinal axis of the rod advantageously allows the rod, with the sleeve and the root post, to be adapted to the specific conditions of the tooth on which the rod is used.

[0046]

[0048] In its application, the rod, particularly in a metallic embodiment, can be cemented to the tooth and / or bonded to the tooth using a resin, optionally with a pre-treated surface of the tooth and / or the rod. Additionally or alternatively, the rod can be firmly attached to the tooth using an acid-etching technique, especially with a flowable resin bonding agent. Advantageously, cementation or attachment by cementation or etching creates a strong bond between the tooth and the rod, preventing unintentional movement and / or dislodgement of the rod. Thus, a rod firmly attached to the tooth advantageously restores the tooth's stability.

[0047]

[0049] In another aspect, the task is solved by using at least two rods, wherein at least one or all of the rods are designed as explained above in the first aspect.

[0048]

[0050] The at least two rods are used, in particular, to stabilize a tooth located in a jaw. The tooth may have a vertical crack in one of its walls or be a crack-prone tooth with a predisposition for developing a vertical crack in one of its walls. In this application, at least one of the rods is positioned horizontally at a first location on the tooth, and at least another rod is positioned horizontally at a second location on the tooth, so that at least two bracing elements are created between the vestibular wall and the palatal wall or between the vestibular wall and the lingual wall.

[0049]

[0051] Using two bars, two braces can be created between the vestibular wall and the palatal wall, or between the vestibular wall and the lingual wall of the tooth. The braces can be positioned in a mesiodistal dimension of the tooth and / or in an occlusal-cervical dimension. Additionally or alternatively, a first bar can be placed on a first tooth and a second bar on a second tooth in the same jaw.

[0050]

[0052] Finally, multiple bars can be arranged on a single tooth and / or on multiple teeth in the jaw. The use of a second or additional bar can advantageously improve the stability of the tooth and / or the stability of multiple teeth.

[0051]

[0053] The features of the second aspect mentioned, as well as the resulting advantages, correspond to those associated with the first aspect of the invention.

[0052]

[0054] In another aspect, the problem is solved by using a conical drill to bore a substantially horizontal conical bore channel into a tooth located in a jaw, with a vertical crack in one wall of the tooth, so that after using the drill, a substantially horizontal and conically tapered bore channel is present in the tooth. In this way, a bracing between a vestibular wall and a palatal wall or between the vestibular wall and a lingual wall of the tooth can be achieved by means of a rod according to the invention inserted into the bore channel.

[0053]

[0055] The taper of the drill bit extends, in particular, over its entire length. Additionally or alternatively, a first taper may be present in a first section of the drill bit and a second taper in a second section. Finally, the first section may be taper and the second section essentially parallel. The shape of the drill bit corresponds, in particular, to a predefined shape of a rod to be inserted.

[0054]

[0056] In one embodiment, the taper and / or effective diameter of the drill bit can be adjusted along its longitudinal extent, particularly using spacers.

[0055]

[0057] A "drill," also called a grinder, is used primarily for removing tooth material. The drill has a diamond-coated surface, at least partially, at one working end. At the opposite end, the drill has a shank, allowing it to be attached to a dental instrument, such as a contra-angle handpiece. The tooth material is removed by moving the diamond-coated surface.

[0056]

[0058] "Essentially horizontal drilling" means that the drill's axis is oriented essentially parallel to a mathematical horizon, even if it deviates slightly from or tilts from this horizon. The orientation of the drill axis also corresponds to the position of the jaw in which the tooth to be drilled is located, and to the position of the tooth itself, insofar as the drill hole is oriented in the same direction as the tooth's transverse axis, which runs along an axis extending from the outside through the tooth into the oral cavity. Horizontal drilling thus refers specifically to drilling into a tooth in a jaw held in its normal position. If the jaw is positioned differently, the drill's orientation, according to the above logic, will deviate from the mathematical horizon.

[0057]

[0059] The resulting drill channel, created by essentially horizontal drilling, is therefore also essentially horizontal insofar as it relates to a jaw held in its normal position. With a different jaw position, the orientation of the drill channel on the tooth, according to the preceding logic, deviates from the mathematical horizon. The transverse dimension of the drill bit can essentially correspond to that of the rod used. The shape of the drill bit's transverse dimension can be essentially round. Additionally or alternatively, the shape of the drill bit, particularly along its longitudinal dimension, can correspond to the shape of the rod used. The drill bit can have a conical, cylindrical, and / or parallel-conical shape along its transverse dimension.

[0058]

[0060] Additionally or alternatively, a thread can be cut into a borehole produced with a drill, particularly using a tap. Advantageously, a borehole can be produced in a tooth, allowing the rod to be used according to the invention for stabilizing a tooth.

[0059]

[0061] The drilled channel is round and penetrates at least one tooth wall, in particular two. A round drilled channel can be further developed into an oval and / or rectangular drilled channel using a diamond-coated ultrasonic tip. A rectangular drilled channel can be star-shaped. The cross-sectional shape of the rod used corresponds in particular to the cross-sectional shape of the drilled channel. An oval and / or rectangular drilled channel advantageously provides optimized torsional rigidity of a rod arranged in the drilled channel.

[0062] In one embodiment, the drill has a drill stop. The drill stop can be adjustable, allowing drilling to a predefined depth. Additionally or alternatively, the drill stop can be equipped with a second drill insert, enabling the creation of a recess in the drill channel, particularly around the vestibular wall of the tooth. A veneer bar can then be inserted into this recess.

[0060]

[0063] The features of the latter aspect and the advantages arising from them correspond to those mentioned in connection with the first-mentioned aspect of the invention.

[0061]

[0064] The invention will now be explained in more detail using exemplary embodiments. These will show...

[0062] Figure 1 shows a schematic representation of an upper jaw,

[0063] Figure 2 shows a schematic representation of an upper jaw tooth with a cylindrical rod,

[0064] Figure 3 shows a schematic representation of an upper jaw tooth with a conical rod,

[0065] Figure 4 shows a schematic representation of a cylindrical rod, a conical rod, a parallel-conical rod and a threaded rod; Figure 5 shows a working end of the grinder for producing a bore channel; and

[0066] Figure 6 shows a tooth with a cylindrical rod and a root post.

[0067]

[0065] In an upper jaw 103, without wisdom teeth or additional teeth, there are naturally 14 teeth. A first molar tooth 105 has a pulp, dentin 125 largely surrounding the pulp, and enamel 127 surrounding the dentin in an upper region of the first molar tooth 105. The first molar tooth 105 has a vestibular tooth wall 109 and a palatal tooth wall 111 opposite the vestibular tooth wall 109 in the direction of the transverse extension of the first molar tooth 105. A crack 107 is present on the first molar tooth 105. In Figure 2, a predisposed crack 133 is also present on the first molar tooth 105. The crack 107 partially penetrates the dentin 125 of the first molar tooth 105 and partially the enamel 127 of the first molar tooth 105 and is oriented in the direction of a transverse extension of the first molar tooth 105.

[0068]

[0066] To provide stability to the first molar tooth 105, a cylindrical rod 101a is arranged in the first molar tooth 105, as shown in Figure 2, and a conical rod 101b is arranged in the first molar tooth 105, as shown in Figure 3. Alternatively, a parallel-conical rod 101c and / or a threaded rod 101d can be used to provide stability to the first molar tooth 105. The cylindrical rod 101a has a constant diameter d1 = 1 mm and a length of 18 mm, which exceeds the vestibular-palatal extent of the first molar tooth 105. The cylindrical rod 101a is made of glass fiber reinforced plastic.

[0069]

[0067] The conical rod 101b has a diameter d1 = 1 mm at a first end and a diameter d2 = 0.5 mm at an opposite second end. In use, the second end is arranged on the palatal wall 109 of the first molar tooth 105 and the first end on the vestibular wall 111 of the first molar tooth 105.

[0070]

[0068] The parallel-conical rod 101c has a constant diameter of d1 = 1 mm in a first region I. In a second region II, the parallel-conical rod 101c also has a diameter of d1 facing the first region, which tapers along the longitudinal extent of the parallel-conical rod 101c to a diameter of d3 = 0.7 mm. The second end of the parallel-conical rod, which has a diameter of d3, is, in particular, arranged on the palatal wall 109 of the first molar tooth 105.

[0071]

[0069] The threaded rod 101d has a cap 113 at its first end. At a second end, opposite the first end, the threaded rod 101d has a thread. In use, the second end of the threaded rod 101d is positioned in a prepared threaded bore on the palatal wall 109 of the first molar tooth 105. The cap 113 is positioned on the vestibular wall 111 of the first molar tooth 105 and optically closes the bore of the threaded rod 101d, so that, after polishing, the vestibular tooth wall and a surface of the cap 113 lie essentially in one plane.

[0072]

[0070] A grinder 121, which is configured for producing a bore channel, has a predefined length that corresponds to a length of the rod and a transverse extent of the first molar tooth 105, and a predefined transverse extent that corresponds to the rod 101 to be used. Along its longitudinal extent at the working end, the grinder 121 has a diamond coating 131 by means of which the bore channel can be introduced into the first molar tooth 105. At the second end, the grinder 121 has a centering tip 129. At the first end, where the grinder 121 can be received by a means for producing bore holes, the grinder 121 has a drill stop 123 that corresponds to the predefined length.

[0073]

[0071] In one embodiment, a sleeve 115 is arranged along the longitudinal extent of a cylindrical rod 101a. A root post receptacle projects from the sleeve 115, in which a root post 117 is received. The root post 117 is inserted into a root canal of the pulp 119 of the first molar tooth 105. Thus, the positioning of the cylindrical rod 101a, which connects the vestibular tooth wall 109 to the palatal tooth wall 111 in a crack-bridging manner, is additionally secured to the first molar tooth 105 by means of the root post 117. List of reference numerals

[0074] 101a cylindrical rod 101b conical rod

[0075] 101c parallel-conical rod 101d threaded rod

[0076] 103 Upper jaw

[0077] 105 first molar right 107 crack

[0078] 109 verstibular tooth wall 111 palatal tooth wall 113 ventral cap

[0079] 115 Sleeve

[0080] 117 Root pin

[0081] 119 Pulp

[0082] 121 grinders

[0083] 123 Drill stop

[0084] 125 Dentin

[0085] 127 Tooth enamel

[0086] 129 Centering tip

[0087] 131 Diamondization

[0088] 133 predisposed crack d1 first diameter

[0089] d2 second diameter d3 third diameter

[0090] 1 Length

[0091] I first area

[0092] II second area

Claims

Patent claims:

1. Use of a rod (101) for stabilizing a tooth (105) arranged in a jaw (103) with a crack (107) arranged vertically in a wall of the tooth (105) or for stabilizing a crack-prone tooth arranged in the jaw (103) which has a predisposition for a crack (133) arranged vertically in a wall of the tooth, wherein the wall has a vestibular wall (109) and a palatal or lingual wall (111) opposite the vestibular wall (109), wherein in the case of use the rod (101) is arranged horizontally on the tooth (105) and realizes a bracing between the vestibular wall (109) and the palatal wall or between the vestibular wall (109) and the lingual wall (111).

2. Use of a rod (101) according to claim 1, wherein the rod (101) comprises metal, ceramic, plastic and / or a fiber-reinforced material.

3. Use of a rod (101) according to one of the preceding claims, wherein the rod (101) has a diameter (d) of up to 3 mm, in particular 0.5 mm to 1.5 mm and a length (1) of 8 mm to 20 mm.

4. Use of a rod (101) according to one of the preceding claims, wherein the rod (101) is a cylindrical rod (101a) and has a constant first diameter (d1) extending from a first end along its longitudinal extent to its second end, is a conical rod (101b) and has a first diameter (d1) at a first end which decreases constantly along a longitudinal extent to a second diameter (d2) at the second end, is a parallel-conical rod (101c) and has a first diameter (d1) extending from a first end the first area (I) arranged has a constant first diameter (d1) and in a second area (II) adjoining it in the direction of a second end has a diameter that decreases constantly up to a third diameter (d3) and / or is a threaded rod (101d) which has an external thread at at least one end, to which a corresponding internal thread can be introduced in the wall of the tooth (105).

5. Use of a rod (101) according to claim 4, wherein the second diameter (d2) is up to 10% smaller, in particular 0.01% to 3% smaller, than the first diameter (d1).

6. Use of a rod (101) according to one of the preceding claims, wherein the rod (101) has a facing (113) at at least one end.

7. Use of a rod (101) according to one of the preceding claims, wherein a sleeve (115) is additionally arranged on the rod (101) as a receiving device for a root pin (117).

8. Use of a rod (101) according to one of the preceding claims, wherein in the case of use the rod (101) is fixedly arranged on the tooth (105) by means of cementation and / or acid etching processes using a bonding system.

9. Use of at least two rods (101), wherein at least one of the rods (101) or all of the rods (101) is or are configured according to one of the preceding claims, for stabilizing a tooth (105) arranged in a jaw with a vertical crack (107) arranged in a wall of the tooth (105) or for stabilizing a crack-prone tooth arranged in the jaw (103) which has a predisposition for a vertical crack (133) arranged in a wall of the tooth, wherein in the In the case of use, one of the rods (101) is arranged at a first position of the tooth (105) in a horizontal orientation and at least one other of the rods (101) is arranged at a second position of the tooth (105) in a horizontal orientation, such that at least two bracing is realized between the vestibular wall (109) and the palatal wall or between the vestibular wall (109) and the lingual wall (111).

10. Use of a drill (121) having a conical shape, for substantially horizontal drilling into a tooth (105) arranged in a jaw (103) with a crack (107) arranged vertically in a wall of the tooth (105) or into a crack-prone tooth arranged in the jaw (103) which has a predisposition for a crack (133) arranged vertically in a wall of the tooth, so that after use there is a substantially horizontal and conically tapered drill channel in the tooth (105).

11. Use of a drill (121) according to claim 10, wherein the drill has a drill stop (123).

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