MXPA06002138A - Endodontic post for dental reconstruction with an endodontic treatment. - Google Patents

Abstract

An intra-radicular post is described for rebuilding of teeth, with treatment of passages, comprised of one apical portion, a body adjacent to the apical portion, and one head adjacent to the body; characterized because the body is frusto-conical and tapered in such a way that its diameter is greater at the side proximal to the head and lower at the side proximal to the apical portion; apical portion comprises cylindrical segments with a flat end; and the head portion comprises conical segments having at least one flat lateral face; the post having thus improved insertion and retention properties.

Description

ENDODONTIC POST FOR RECONSTRUCTION OF TEETH WITH ENDODONTIC TREATMENT DESCRIPTION FIELD OF THE INVENTION The present invention relates to an endodontic post and a procedure for the reconstruction of teeth with root canal treatments, a technique that is also known as endodontics.

BACKGROUND OF THE INVENTION The human tooth comprises a root and a crown. The crown is the visible part of the tooth, which is seen above the gum while the root is immersed in the gum. Through the root the teeth are anchored to the maxillary or mandibular bones. Within the root there are ducts which contain dental tissue consisting of nerves and blood vessels.

The dental tissue can get infected by various causes such as cavities, trauma, fractures, etc. Depending on the magnitude of the loss of dental tissue, said teeth require root canal treatment or endodontics.

Endodontics is a branch of dentistry that deals with teeth that have diseases in the dental tissue.

The purpose of root canal treatment is to remove diseased dental tissue, clean and fill the canal and place a crown to preserve the functionality of the tooth.

In many cases the crown is destroyed by decay or trauma, then an artificial prosthetic crown is used that replaces the original crown.

To fix the artificial prosthetic crown, it is necessary to place intra-radicular or endodontic posts or bolts that are inserted in the root canal of the tooth, which aim to anchor some restorative material that in turn will serve as a support to an artificial prosthetic crown.

These poles exist in dentistry since a long time ago, they have been manufactured in different ways, techniques and materials. In the market there are poles with smooth designs, fluted, parallel, conical and combined. Marco Ferrari and Roberto Scotti in their work entitled FIBER POST, Masson SPA., Italy 2002, describe a variety of poles of prior art.

United States Patent No. 4,952,150 of August 28, 1990 discloses an endodontic post for curved roots. On the other hand, the patent of the United States 6,447,297 of September 10, 2002 describes an endodontic post comprising a nozzle for the injection of fig material of the root.

Among the disadvantages of the endodontic posts of the prior art, the following may be mentioned. a) The posts of the previous technique are designed for straight roots, while most of the teeth have conical roots. b) The poles of the previous technique have not found a balance between the post resistance and the flexibility required for its application. c) The posts of the previous technique are designed for a single type of tooth, ie for apex, body and head dimensions constant. While the dimensions of the ducts are variable, which requires a great variety of posts to apply in conduits of different dimensions. d) The poles of the previous technique once installed have vertical dislocation and rotation of the crown as a result of poor positioning and retension derived from the design of the post.

SUMMARY OF THE INVENTION The aforementioned drawbacks of the poles of the prior art are overcome with the post of the present invention.

Therefore, a first object of the invention is to provide an endodontic post useful for reconstructing teeth with conduit treatment with improved positioning and retention properties within the tooth canal.

A second object of the invention is to provide an endodontic post useful for reconstructing teeth with conduit treatment with improved vertical and axial crown retention properties.

A further object of the present invention is to provide an endodontic post useful for reconstructing teeth with treatment of conduits of adjustable dimensions.

The aforementioned objectives are achieved by providing an endodontic post comprising an endodontic post of adjustable dimensions for the reconstruction of teeth with root canal treatment comprising: (a) an apical portion formed by segments of constant diameter; (b) a tapered section formed by frustroconical segments adjacent to the apical portion; and (c) a head adjacent to the tapered section; characterized in that the tapered section comprises at least one groove disposed in the peripheral surface of the tapered section and in that the head comprises at least one self-retaining segment attached to a neck.

BRIEF DESCRIPTION OF THE FIGURES.

Fig. 1a and Fig. 1b show a first embodiment of the endodontic post of the present invention in front and side views respectively.

Fig. 1 c and Fig. 1d show bottom views of the endodontic post of the present invention of the front and side views of the embodiment illustrated in Figs. 1 a and 1 b respectively.

Fig. 1 e shows an enlargement of a detail of the channels of the tapered section of the endodontic post illustrated in Fig. 1 a.

Fig. 2a and Fig. 2b show a second embodiment of the endodontic post of the present invention in front and side views respectively.

Fig. 2c and Fig. 2d show bottom views of the endodontic post of the present invention of the front and side views of the embodiment illustrated in Figs. 2a and 2b respectively.

Fig. 2e shows an enlargement of a detail of the channels of the tapered section of the endodontic post illustrated in Fig. 2a.

Fig. 3a and Fig. 3b show a third embodiment of the endodontic post of the present invention in front and side views respectively.

Fig. 3c and Fig. 3d show bottom views of the endodontic post of the present invention of the front and side views of the embodiment illustrated in Figs. 3a and 3b respectively.

Fig. 3e shows an enlargement of a detail of the channels of the tapered section of the endodontic post illustrated in Fig. 3a.

DETAILED DESCRIPTION OF THE INVENTION.

Endodontic procedures have evolved towards the use of instruments known as rotating instruments which differ, among other things, from the traditional ones in the conicity that they have and with which these conduits will be shaped, in a more anatomical way. The present invention relates to endodontic posts for root canal treatment with rotary instruments.

The endodontic post of the present invention is flexible in terms of height, taper and filling with respect to the endodontic rotary drills that are used to prepare the canal.

The endodontic post shown in the figures has a total length of about 14 mm, which are divided into three parts, the upper portion or head A, the tapered section B and the lower or apical portion O The apical portion C is adjacent to the to the tapered section B, while the head A is also adjacent to the tapered section B.

The endodontic post has a tapered shape, so that the apical portion C has a smaller diameter than the diameter of the upper portion or head A. The diameter of the tapered section B also progressively increases towards the upper portion or head A. The conicity or taper of the body is 0.06 mm / mm and in an alternate mode of 0.04 mm / mm. This conicity coincides with that reported in the literature in the root canals of the teeth as well as the rotary endodontic instruments used for the treatment of ducts. The tapered section portions B comprise frustoconical segments.

By frustoconical segments, conical-like sections should be understood in which the two ends are flat and one end has a larger diameter than the other.

The endodontic post is placed inside the tooth canal in which the dental tissue has been removed. Once the endodontic post is placed, the apical portion C and the tapered section B will remain immersed within the tooth canal, while the upper portion or head A will protrude from the canal, so that it can serve as an anchor for the prosthetic crown.

The lower or apical portion comprises a cylindrical segment with a constant diameter, with a total length of the apical portion of about 2 mm and has a flat end.

The main function of the apical portion C is to provide an actual post stop at the bottom of the duct. The apical portion C has improved insertion properties of the post in the conduit with respect to the posts of the prior art having pointed apex portions. The apical tips are susceptible to deform and break.

In order to make adjustments to the dimensions of the apical portion C, it is provided the possibility of making a cut in the body of the apical portion in order to eliminate the segment thereof, preferably the apical portion C must have a minimum length of 1 mm The second tapered portion or section B has a plurality of frustoconical segments. Preferably, the tapered section B is formed by six frustoconical segments, a first segment of approx. 2 mm in height and five segments of approx. 1 mm in height each, resulting in a total length of the tapered section of approximately 7mm in length. Each frustoconical segment has an upper diameter, closer to the head portion A and a lower diameter closer to the apical portion C. The upper diameter being larger than the lower diameter. The first frustoconical segment has a larger diameter and length than the remaining five frustoconical segments.

The conicity or taper of the cones 31 to 37 may be variable, preferably between 0.03 mm / mm and 0.08 mm / mm, preferably about 0.04 mm / mm and 0.06 mm / mm, that is, the larger diameter decreases 0.04 (or 0.06) mm for each millimeter of the length of the tapered section B, in such a way that none of the frustoconical segments have similar dimensions. The cones closest to the portion of the head A have an upper diameter to lower diameter ratio greater than that of the cones closest to the apical portion C. In other words, the segments closest to the head A are more tapered than the segments closest to the apical portion C and also have a larger diameter and are therefore wider. As can be seen in Figs. 1 a, 2a and 3a, the frustrocone segment adjacent to the apical portion has a very thin taper that is a natural continuation to the cylindrical apical portion.

Additionally, in the entire perimeter area of the tapered section, there is a groove (g) in the form of a spiral. The edges of the channel function as wedges that prevent the endodontic post from moving vertically up or down. In addition, they can contain adhesive that is distributed along the length of the channel, preventing it from agglomerating and avoiding close contact between the post and the tooth canal.

The design of the tapered section increases the retention of the endodontic post within the tooth channel, allowing a procedure of easy stuck In addition, the design of the frustoconical segments and the groove (g) prevent vertical dislocation. In Figures 1e, 2e and 3e the slots (g) are shown in the three embodiments of the post of the present invention. Although in Figures 1 b, 2b and 3b the first frustoconical segment, adjacent to the head A, does not include the groove (g) a person skilled in the art will be able to notice that the groove (g) can extend throughout the tapered section or in certain frustroconical segments of the section that has been sprayed. In addition, although a post with a slot has been illustrated, a person skilled in the art will understand that the tapered section may have more than one slot.

On the other hand, attenuation of the conicity in the vicinity of the apical portion C allows the best insertion of the post into the tooth canal. The ducts are usually wider in the area near the crown and become narrower at the root.

In accordance with the present invention, the head A comprises at least two self-retentive segments (v). Self-retentive segments prevent vertical dislocation and rotation of the stump or crown where the post is anchored.

As seen in Figs. 1c and 1d the self-retentive segments (v) of the head A, have an oval shape that prevents the rotation of the stump or crown around the axis of the post. Additionally, as seen in Figs. 1a and 1b, the head A comprises at least two self-retaining segments (I) and (II) that include a neck (n). By virtue of the fact that the neck (n) has a smaller diameter than the diameter of the self-retentive segment, when the crown is placed the material of the crown surrounds the self-retentive segment and neck assembly. By virtue of said neck the crown can not dislocate in the vertical direction.

The arrangement of at least two self-retentive segments allows adjustment of the post dimensions. In such a way that a cut can be made in the post to eliminate a self-retentive segment depending on the height of the crown.

In Figs. 2c and 2d a second embodiment of the post of the present invention is shown. According to the figures, the self-retentive segments have a circular shape with two flat opposite faces. This also prevents vertical dislocation and rotation of the crown. As will be apparent to one skilled in the art, a circular self-retentive segment may possess only one flat face, or two adjacent flat faces.

In Figs. 3c and 3d a third embodiment of the invention is shown. According to this, the self-retentive segments have a triangular cross section.

The poles optionally have a color code for easier identification of the apex with the dimensions of the taper required for a specific application.

The endodontic post can be manufactured in a variety of materials, for example quartz fiber, carbon fiber, glass fiber. The preferred material is quartz fiber, which has the best mechanical properties in terms of strength and flexibility.

In addition, quartz fiber has the best aesthetic properties by virtue of having a radiopaque color, which results in a more natural appearance of the prosthetic crown, which deviates from the artificial appearance that results from the use of endodontic posts of the previous technique

Claims (6)

1. An endodontic post of adjustable dimensions for the reconstruction of teeth with root canal treatment comprising: (a) an apical portion formed by segments of constant diameter; (b) a tapered section formed by frustoconical segments adjacent to the apical portion; and (c) a head adjacent to the tapered section characterized in that the head comprises at least one self-retaining segment attached to a neck.

2. An endodontic post of adjustable dimensions for the reconstruction of teeth with root canal treatment comprising: (a) an apical portion formed by segments of constant diameter; (b) a tapered section formed by frustoconical segments adjacent to the apical portion; and (c) a head adjacent to the tapered section characterized in that the tapered section comprises at least one groove disposed in the peripheral surface of the tapered section.

3. An endodontic post for the reconstruction of teeth with root canal treatment according to claims 1 or 2, wherein the body of the post has a taper of between 0.03 and 0.08 mm / mm.

4. An endodontic post for the reconstruction of teeth with root canal treatment according to claims 1 or 2, where the body of the post has a taper of 0.04 mm / mm.

5. An endodontic post for the reconstruction of teeth with root canal treatment according to claims 1 or 2, where the post body has a taper of 0.06 mm / mm.

6. An endodontic post for the reconstruction of teeth with root canal treatment according to claims 1 or 2, wherein the self-retentive segments of the head have an oval, triangular or circular cross section with one or two flat faces.