ROOT CANAL FILLING COMPOSITION

Abstract

The invention relates to a root canal filling composition for placement in a tooth root canal, a kit for providing the required materials, and a method for applying the materials. It is provided that the root canal filling composition comprises a glass-fibre post and a dentine-adhesive filling material.

Claims

1. A root canal filling composition for placement in a tooth root canal, comprising an elongate glass-fibre post with a first end and a second end, an apical stop, which is made of a physiological material and is arranged at the first end, and a filling material, which surrounds the glass-fibre post over its entire surface at least in some regions, characterised in that the filling material comprises a dentine-adhesive filling material.

2. The root canal filling composition according to claim 1, characterised in that the filling material comprises or consists of a composite, in particular a dual-curing composite and/or a self-adhesive material.

3. The root canal filling composition according to claim 1, characterised in that the glass-fibre post is formed in one or more parts, wherein in the case of a multi-part design a plurality of elongate parts which are not connected to one another in an integrally bonded manner and are arranged next to one another form the glass-fibre post and are detachably connected to one another in particular via a holder.

4. The root canal filling composition according to claim 1, characterised in that the apical stop comprises or consists of a physiological material, in particular a bioresorbable material.

5. The root canal filling composition according to claim 1, characterised in that the apical stop comprises an alkyl cyanoacrylate, in particular with an alkyl chain length in the range of C.sub.2 to C.sub.8.

6. The root canal filling composition according to claim 1, characterized in that the apical stop comprises an alginate, a hyaluronic acid, a collagen, and/or a bone adhesive containing in particular cyanoacrylates, hydroxyapatite, acyl acrylonitrile, dialkyl methylene manolate, -substituted vinylidene alkylsulphonates, sulphonates and/or derivatives thereof.

7. The root canal filling composition according to claim 1, characterised in that the apical stop (5) has a length of not more than 1/10 of the length of the glass-fibre post (2).

8.-14. (canceled)

15. The root canal filling composition according to claim 1, characterised in that the apical stop has a length of not more than 1/20 of the length of the glass-fibre post.

16. A kit for producing a root canal filling composition according to claim 1, containing a glass-fibre post, an apical stop or precursor thereof, and a dentine-adhesive filling material or precursor thereof.

17. The kit according to claim 16, characterised in that the filling material is premixed and is not cured or is only partially cured.

18. The kit according to claim 16, characterised in that the filling material is a composite, a dual-curing or light-curing composite and/or a self-adhesive composite.

19. The kit according to claim 16, further comprising a dentine-adhesive primer.

20. The kit according to claim 16, wherein the glass-fibre post, the apical stop or precursor thereof and the dentine-adhesive filling material or precursor thereof are arranged in the kit spatially separated from each other, in particular individually packaged, or are present in the form of the root canal filling composition according to claim 1, wherein in the latter case the filling material arranged on the glass-fibre post is additionally enclosed in an insulated manner in such a way that it is fixed to the glass-fibre post, in particular with contact to the latter, and in particular is sealed hermetically and in a sterile manner.

21. The kit according to claim 16, wherein the apical stop has a length of not more than 1/10 of the length of the glass-fibre post.

22. The kit according to claim 16, wherein the set comprises each of the components in a quantity to allow the filling of one tooth at a time.

23. The kit according to claim 21, wherein the set comprises each of the components in a quantity to allow the filling of one tooth at a time.

24. A method for applying a root canal filling composition according to claim 1 ex-vivo in a root canal opened beyond the apical region, comprising the following steps in the order given: a) placing the physiological apical stop in the apex, the apical stop optionally protruding from the apical region by being over-tamped, and not extending into the root canal by more than 1/10 of the total root canal length, b) applying a filling material in the root canal comprising a glass-fibre post (2) and a dentine-adhesive filling material, and c) curing the filling material.

Description

[0079] The invention will be explained below in exemplary embodiments with reference to the associated drawings, in which:

[0080] FIG. 1 shows a schematic basic sketch of a root canal filling composition in a preferred configuration;

[0081] FIG. 2 shows an X-ray image of a root canal filling composition applied in a root canal in the preferred configuration; and

[0082] FIG. 3 shows an enlarged view of a detail of the X-ray image from FIG. 2.

[0083] FIG. 1 shows a schematic basic sketch of a root canal filling composition 1 in a preferred configuration of the invention. Shown is a glass-fibre post 2, which may be configured in one or more parts. The glass-fibre post 2 has a first end 3 and a second end 4. In particular in a multi-part configuration, the glass-fibre post 2 tapers towards the first end 3. An apical stop 5 is located at the first end 3 of the glass-fibre post 2. This is made of a physiological material and preferably comprises a bone adhesive, such as hydroxyapatite and/or an alkyl cyanoacrylate. At the second end 4 of the glass-fibre post 2, there is arranged a holder 7 in the embodiment shown. This holder 7 is, in principle, optional, but allows for stabilisation, especially if the glass-fibre post 2 is configured in a number of parts. A filling material 6 consisting of a dentine-adhesive material is arranged around the glass-fibre post 2. The dentine-adhesive material has the advantage that, when applied in an open tooth root canal, it penetrates the dentinal tubules and thus tightly seals the canal bacteria and gives the open root canal stability again after closing. The filling material 6 may also contain particles which reduce the effect of shrinkage of the filling material 6 and at the same time increase the stability of the filling.

[0084] FIG. 2 shows a high-resolution X-ray image of a root canal filled with the root canal filling composition 1 according to the invention. In this configuration, the filling material 6 comprises a radiopaque additive which makes it possible to make the arrangement of the filling material in the tooth root canal visible in the X-ray image. Shown is the glass-fibre post 2, which in the embodiment shown runs continuously towards the apical end 3. This is achieved in particular by the multi-part configuration of the glass-fibre post 2, so that several fibres of the glass-fibre post 2 are configured in different lengths so that the diameter of the entire glass-fibre post 2 increases from the apical end 3 to the second end 4 of the glass-fibre post 2. It is clear that the filling material 6 also penetrates into a strongly tapered region of the root canal, which represents the apical region of the tooth root canal, but without coming out of it. Instead, the exit of the apical region towards the periodontium (not shown) is sealed by the apical stop 5. In FIG. 2, the apical stop 5 is only shown as a shadow, as no radiopaque additives are added to it. It is clear, however, that only a very small part of the apical stop 5 extends into the root canal, namely to no more than one tenth, in particular no more than one twentieth of the total root canal length.

[0085] FIG. 3 shows a detail of the root canal filling shown in FIG. 2. The adhesion of the filling material to the dentinal tubules 11 of the tooth root canal and also the fillers added to the filling material 6 can be seen particularly clearly.

[0086] The root canal filling composition 1 according to the invention and the method for its application enable a bacteria-proof and stable root canal filling.

[0087] The following is a practical example for carrying out the method according to the invention in a preferred non-limiting embodiment:

[0088] The prerequisite is a prepared and dried channel. Subsequently, the apical stop according to the invention is inserted, followed by a self-etching bonding agent. After a short drying time, the glass-fibre post according to the invention with the filling material arranged on it, especially the composite, is inserted into the prepared and apically closed canal. Finally, after the composite has cured, the tooth is built up in the upper area, and the outer surfaces are modelled in one continuous step, that is to say without relatively long waiting times.

Practical Example

[0089] Detailed application of the root canal filling composition according to the invention in a preferred configuration using the kit The individual components were packaged separately from one another. In this example, the kit comprises, in addition to the basic provision of a multi-part glass-fibre post, a 2-component filling material with fillers and physiological stop in the form of a collagen plug comprising hydroxyapatite or a pasty alkyl cyanoacrylate composition, the kit further comprising a bonding agent, in particular a self-adhesive/self-etching bonding agent comprising an etchant in the form of phosphoric acid and a dentine-adhesive primer.

[0090] First, an apical stop, for example made of a plug comprising hydroxyapatite or an alkyl cyanoacrylate, is inserted into the root canal and over-tamped using a suitable tool in such a way that the stop remaining in the canal does not extend into the root canal by more than 1/10, in particular not more than 1/20 of the total canal length.

[0091] Next, the dentine surface is wetted with a self-adhesive bonding agent.

[0092] The monomer, i.e. the dentine-adhesive filling material, is then applied and penetrates the collagen fibre network right into the dental canaliculi. The resulting hybrid layer is cured by light-induced polymerisation. This polymer layer is now micromechanically anchored in the tubules and in the penetrated collagen fibre network by means of tags (pegs).

REFERENCE LIST

[0093] 1 Root canal filling composition [0094] 2 Glass fibre post [0095] 3 First end [0096] 4 Second end [0097] 5 Apical stop [0098] 6 Filling material [0099] 7 Holder [0100] 10 Dentine [0101] 11 Dentinal tubules