DE102004041393A1 - Root post for dental restorations consists of plastically-deformable plastic body hardenable (especially by light) when inserted into the root canal - Google Patents

Abstract

A root post (1) for use in dental restorations consists at least in part of a plastic body in a plastically-deformable state and is hardenable after being inserted into a root canal (2).

Description

The The invention relates to a root post of plastically deformable Plastic.

Out The prior art is known for the restoration of teeth by means of appropriate root canal instruments to clear the root canal and to edit in order to subsequently use a root post. Of the Root post is used to stabilize parts of the remaining tooth and attach a structure on which, for example, a Crown can be put on.

at the known embodiments, it is possible on the one hand, the root canal mechanically expand so far that a prefabricated root post can be used is. This is often for reasons the natural one Geometry of the root canal is not or only insufficiently possible. The second leads the Material removal to an additional weakening the tooth root.

The DE 198 47 567 A1 describes a sleeve-shaped restoration element which can be inserted into the root canal and can adapt to a certain extent to its geometry. The restoration element is subsequently filled with plastic. The disadvantage here may be that in certain forms of the root canals, the restoration element is not or insufficiently suitable for use, so that there is no secure anchoring. Moreover, problems can arise for accurately fitting, dense bonding of the restoration element, which are undesirable from a medical point of view.

Of the Invention is based on the object, a root post for restoration of teeth to create which with a simple construction and easier, cheaper Manufacturability is easily applicable and while avoiding the disadvantages the prior art, a good fit and attachment results.

According to the invention Problem solved by the feature combination of the main claim, the under claims show further advantageous embodiments of the invention.

According to the invention is thus provided that the root post at least partially consists of a plastic molding, which is in a plastically deformable state. Of the Plastic moldings can thus be introduced into the root canal, the natural form of the root canal not in advance to a defined geometric Shape must be widened. It is therefore not necessary to Root canal to a conical or cylindrical shape. Rather, the inventive plastic molded body in the cleared out and pre-prepared root canal be used. Here, the plastic molded body is plastic deformed so that it exactly matches the shape of the root canal and the anatomical conditions. This eliminates the disadvantages in the treatment described in the prior art of the root canal. In particular, the dentist can use the tooth treat endodontically largely substance-saving, without The natural Weakened hard tooth substance becomes.

There the root post according to the invention or his plastic molding plastically deformable, a slight pressure is sufficient to the plastic material to be applied to the wall of the root canal. This is special therefore advantageous because root canals in cross-section is not always circular, but irregular or are oval.

According to the invention thus a fitting fitting the geometry of the root post and a accurate filling of the processed root canal.

at the procedure of the invention Is it possible, the overall geometry of the root post to the respective conditions adapt. This concerns in particular also the free, from the root canal projecting end of the root post. This can be done easily by the dentist be processed, since it is also in plastically deformable State is. The end can thus be in terms of its outstanding Length of Geometry of the tooth to be restored. Consequently is the attachment of the tooth structure, the crown or the like, easy and with minimal effort possible.

The Plastic material of the plastic molding is inventively chosen so that it subsequently curable is. According to the invention thus takes place first the shape of the plastic molding by insertion into the Root canal and by modeling the free, protruding end region. following the plastic material is cured. The curing can for example, by exposure to light. This is a suitable Plastic material provided. However, it is also possible the To make a root post from an autopolymerizing material, which, for example, by the impact with light energy or means of a mixed hardener hardened by itself in its entirety.

It is according to the invention possible, as material for to select the root canal plastics that are biocompatible and are characterized by a sufficient strength, toughness or hardness. This can be accessed on plastic materials that already are tested in dentistry or in general medicine. For example, the plastic may have a matrix of phenolic resin or made of composite materials.

According to the invention can be low It may also be the plastic material by means of fibers or by means reinforce a tissue.

Around the plastic molding to be able to use in the prepared root canal is in an advantageous Development of the invention provided that the plastic molding rod-shaped or is cylindrical. However, it is also possible the Plastic moldings conical or tubular shape. The tubular Design of the plastic molding can be chosen so that this has either a through hole or recess or only with a one-sided or a two-sided recess or Bore is provided. In all these cases it is beneficial that the plastic molding as completely as possible over the whole length of the root canal can be inserted into these before by pressure application a plastic deformation of the plastic molding and an adaptation to the geometry or anatomy of the root canal takes place.

It is according to the invention also possible, in addition to the plastic molding reinforcing element use, for example in the form of a metallic pin or a plastic pin. For example, it can also be beneficial for this when the plastic molding with one over a part of the length is provided extending central recess.

Also according to the invention several plastic moldings be connectable to a root post. So it is possible, first one Plastic moldings with a small outer diameter Insert into the apical end of the root canal and subsequently a plastic molded body Nachzuschieben having a slightly larger outer diameter.

The Plastic moldings can also in preformed version be formed to, for example, starting from an X-ray, already one possible high accuracy of fit. They are also wrapped or in another way preformed plastic moldings possible.

In a further advantageous embodiment of the invention may Cheap be, the plastic molding pasty, d. H. relatively soft, to design. This can thus for example introduced from a tube or syringe into the root canal become. It is also possible automatically when expressing the plastic molding paste reinforcing fibers or reinforcement fabric. It is possible, too, to choose the material of the plastic molding so that this is gelatinous. This also makes a simple introduction possible in the root canal.

To Optimal medical care can continue to be beneficial be when the plastic molding comprises at its free end an element consisting of gutta-percha, which securely closes the root canal.

at the root canal according to the invention exists after its plastic deformation and adaptation the geometry and the anatomical conditions of the root canal the possibility of this curing in the root canal. However, it is also possible the root post before curing refer to. After external curing, the root post by means of cemented or glued to known means. In a However, modified form of the invention, it is also possible such Already apply fastener on the surface of the plastic molding or to mix with the material of the plastic molding, so that the plastic molding after insertion into the root canal and after its plastic Deformation during or after curing or polymerizing on its own can stick or cement. This is done in one operation a secure connection with the dentin surface of the root canal.

The Processing of the coronal part of the root post, which over the Tooth stump protrudes, either, as already mentioned, in the plastic condition. However, it is also possible for this supernatant End of the post after curing or polymerizing to edit and to the desired Adapt the shape of the tooth to be restored. The plastic material can be machined in a simple manner, for example by grinding, milling or similar. When working in the plastic state, it is on the one hand modelable, on the other hand by means of a knife or a pair of scissors cut.

In the case of the root post according to the invention, it is thus provided that the plastic material is inserted and processed in a plastically deformable state and that subsequent curing or polymerisation takes place when the material of the post has been adapted to the shape of the root canal and the other conditions. Consequently results in an excellent, tight fit of the root post in the root canal. Weakening of the tooth root can be avoided. The root post is easily adaptable to the particular anatomy of the patient. Furthermore, the number of required operations can be minimized, resulting in significant cost savings. According to the invention, both the preparation of the root canal as well as the production of the tooth structure in a conventional manner, so that the dentist have all options open.

in the Below, the invention is based on an embodiment in connection described with the drawing. Showing:

1 a schematic sectional view through a tooth root of a tooth restored by means of the inventive root pin,

2 a schematic representation of an embodiment of the plastic molding according to the invention,

3 a schematic partial view, analog 1 , a tooth root with root canal in different cross-sectional shapes,

4 a partial representation, analog 1 , a tooth root with a schematic representation of the plastic molded body in a multi-part design, and

5 a further schematic representation of a molded plastic body with designed upper end portion for applying a tooth structure.

The 1 shows first in a schematic representation in longitudinal section a tooth root 4 with a root canal 2 , In the processed root canal 2 there is a root post according to the invention 1 whose plastic material has adapted to the anatomical shape of the root canal and whose material has already hardened or polymerized.

It is particularly clear that the root canal 1 exactly the shape of the root canal 2 has adjusted.

At the free end area of the root post 1 a gutta-percha element is shown schematically in the root canal 2 is introduced.

With the reference number 5 is a built-up area, which is part of the root post 1 is and has been shaped so that under anatomical adjustment a crown 6 by means of an adhesive 7 can be placed.

The 2 shows a schematic embodiment of an embodiment of a plastic molding according to the invention in a conical, rounded design.

The 3 shows for clarification a root canal which has different cross-sectional shapes over its length, namely an octahedral cross-sectional shape in the upper region, an oval cross-sectional shape in the central region and a round cross-sectional shape in the lower region.

The 4 shows for clarity the use of a multi-part plastic molding. In the lower end of the root canal 2 is a gutta-percha element used. Below are three plastic moldings 8b . 8a and 8c in the root canal 2 inserted. It is understood that the top plastic molded body 8c has been separated to clarify the representation. He would survive, similar to the one in 5 embodiment shown to attach the structure of a tooth.

The 5 shows a similar view to the previous ones 1 and 4 , For clarification, it is shown that the upper end region of the plastic molded body can be formed profiled in order to simplify the tooth structure.

These profiled training can either be preformed or by the dentist be modulated.

1

root post

2

root canal

3

Gutta-percha element

4

tooth root

5

construction area

6

Crown

7

Glue

8th

Plastic moldings

Claims (20)

Root post for the restoration of teeth, characterized in that the root post ( 1 ) consists at least in part of a plastic molding, wherein the plastic molding is in a plastically deformable state and after insertion into a root canal ( 2 ) Forming is curable. Post according to claim 1, characterized in that that the plastic molding provided with a preformed geometry. Post according to claim 2, characterized in that that the plastic molding rod-shaped is. Post according to claim 2, characterized in that that the plastic molding is cylindrical. Post according to claim 2, characterized in that that the plastic molding is conical. Post according to claim 2, characterized in that that the plastic molding tubular is. Post according to one of Claims 1 to 6, characterized that the plastic molding one piece is trained. Root post according to one of claims 1 to 7, characterized in that a plurality of plastic molded body to a root post ( 1 ) are connectable. Root post according to one of claims 1 to 8, characterized in that at the free end region of a gutta-percha existing element ( 3 ) is arranged. Post according to one of claims 1 to 9, characterized that the plastic molding with reinforcing elements is provided. Post according to claim 10, characterized in that that the reinforcing elements are formed in the form of fibers. Post according to claim 10, characterized in that that the reinforcing elements tissue shaped are formed. Post according to one of Claims 1 to 12, characterized that the plastic molding a phenolic resin matrix. Post according to one of Claims 1 to 12, characterized that the plastic molding made of composite materials. Post according to one of Claims 1 to 12, characterized that the plastic molding made of reinforced Made of epoxy plastic. Post according to one of Claims 1 to 15, characterized that the material of the plastic molding through Light action curable is. Post according to one of Claims 1 to 16, characterized that made the material of the plastic molding is made of autopolymerizing material. Post according to one of Claims 1 to 17, characterized that the material of the plastic molding is pasty. Post according to one of Claims 1 to 17, characterized that the material of the plastic molding is gel-like is. Post according to one of Claims 1 to 19, characterized that the material of the plastic molding at least partially comprises a fastening material.