WO2007101488A1

WO2007101488A1 - Stabilizing device for intraosteal implants

Info

Publication number: WO2007101488A1
Application number: PCT/EP2006/069914
Authority: WO
Inventors: Giovanni Carlo Ferretti
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-03-09
Filing date: 2006-12-19
Publication date: 2007-09-13
Anticipated expiration: 2008-09-09
Also published as: ITVR20060049A1

Abstract

A stabilizing device (1) for intraosteal implants, comprising a pin-shaped stump (4) which can be associated, at one of its ends, by way of connecting means (5), with an implant (2) to be stabilized, which is fixed to the bone of the dental arch; the stump (4) can be connected to at least one other contiguous stump (4) by means of at least one rod-like connecting element (8); the stump has at least one containment region (9) for the rod- like connecting element (8) and means for locking the rod-like connecting element in a condition in which it engages the containment region (9).

Description

STABILIZING DEVICE FOR INTRAOSTEAL IMPLANTS Technical Field

The present invention relates to a stabilizing device for intraosteal implants. Background Art

As is known, the current technique to fix dental prostheses uses intraosteal implants, which are fixed in appropriately provided seats provided within the bony tissue of the dental arch, and stumps which are associated with the implants and protrude at least partially from the gum in order to act as anchoring and supporting elements for the prosthesis.

One drawback that can be observed with this technique is the fact that before being able to apply the permanent prosthesis to the implant it is necessary to wait a few months in order to achieve, by means of the regrowth of the bone, the perfect integration of the implant with the bone of the dental arch and thus ensure correct stability of the prosthesis.

In order to try to solve this problem and thus allow the possibility of a substantially immediate application of a dental prosthesis, though a temporary one, a solution has been proposed which associates a stump with the implants and welds to stumps of contiguous implants a rod-like connecting element, which is generally constituted by a metallic wire and allows to provide in practice a mechanical connection among the several implants.

Temporary dental prostheses are then fixed to such stumps and optionally to the rod-like connecting elements. Although such prostheses are designed to be subsequently replaced with the permanent ones, they allow the patient to have a set of teeth during the time required for implant stabilization. With this solution, the loads to which temporary prostheses are subjected during use are spread among a plurality of implants, thus distributing themselves onto larger surfaces and achieving a reduction of the specific stresses discharged onto the bone. Although this solution is valid in principle, it has the drawback of requiring the use of a welding unit inside the mouth of the patient.

Another drawback which can be ascribed to the solution described above is the considerable difficulty in providing the correct tensioning of the metallic wire used to connect to each other several implants, with the additional disadvantage, therefore, of not even being certain that they are immobilized adequately. Disclosure of the Invention

The aim of the present invention is to solve the problems described above by providing a stabilizing device for intraosteal implants which allows, in very short times, to use a dental prosthesis, providing the mutual interconnection of several implants without however requiring the use of welding units during its application.

Within this aim, an object of the present invention is to provide a stabilizing device for intraosteal implants which allows to provide simply and rapidly the correct tensioning of the elements used to connect the implants one another.

Another object of the invention is to provide a stabilizing device for intraosteal implants which, thanks to its particular constructive characteristics, is capable of giving the greatest assurances of reliability and safety in use.

Still another object of the present invention is to provide a stabilizing device for intraosteal implants which can be obtained easily starting from commonly commercially available elements and materials and is further competitive from a merely economical standpoint.

This aim and these and other objects, which will become better apparent hereinafter, are achieved by a stabilizing device for intraosteal implants according to claim 1. Brief Description of the Drawings Further characteristics and advantages of the invention will become better apparent from the description of some preferred but not exclusive embodiments of the device according to the invention, illustrated by way of non-limiting example in the accompanying drawings, wherein:

Figure 1 is a schematic partially cutout plan view of the device according to the invention applied to a dental arch;

Figure 2 is a front view of the device according to the invention applied to the arch, with the prostheses shown in phantom lines for the sake of greater clarity;

Figure 3 is a partially sectional front view of a detail of the device according to the invention;

Figure 4 is a perspective exploded view of a device for anchoring the device according to the invention;

Figure 5 is a partially exploded side elevation view of the device with parts shown in longitudinal cross-section; Figure 6 is a sectional view, taken along the line VI-VI of Figure 5;

Figure 7 is an exploded perspective view of a constructive variation of the device according to the invention;

Figure 8 is a partially sectional exploded side elevation view of the variation of Figure 7; Figure 9 is a view of the application of the variation shown in Figures

7 and 8;

Figure 10 is a side view of the device, illustrating a possible embodiment of means for pretensioning the rod-like connecting element;

Figure 11 is a side view, with parts shown in cross-section, of another possible embodiment of the pretensioning means of the rod-like connecting element;

Figure 12 is an exploded perspective view of another constructive variation of the device according to the invention;

Figure 13 is a partially sectional side elevation view of the variation of Figure 12; Figure 14 is a partially sectional side view of the application of the variation of Figure 12;

Figure 15 is a view similar to Figure 3;

Figure 16 is a partially sectional elevation view of an associated implant;

Figure 17 is a transverse sectional view of the stump shown in Figure 16;

Figure 18 is a transverse sectional view of a variation of the device according to the invention; Figure 19 is a transverse sectional view, similar to Figure 18, but with the insertion of the rod-like element;

Figure 20 is an exploded perspective view of the variation shown in Figures 18 and 19;

Figure 21 is an exploded perspective view of a further variation of the device according to the invention.

Ways of carrying out the Invention

With reference to the figures, a stabilizing device according to the invention, generally designated by the reference numeral 1 , comprises a pin- shaped stump 4, which can be connected at one of its ends, by way of connecting means 5, to an intraosteal implant 2 to be stabilized, which is provided with an elongated body designed to be fixed to the bone 3 of the dental arch.

Preferably, in a per se known manner, the elongated body of the implant 2 is introduced in a hole provided in the bone 3 and is provided with an external thread 7 which allows to increase the anchoring of the implant 2 to said bone 3.

The stump 4 can be connected to at least one other contiguous stump 4 by means of at least one rod-like connecting element 8.

Advantageously, said rod-like connecting element 8 can be provided by a substantially rigid metallic bar or more preferably by a steel wire so that it is flexible.

It is possible to apply to the stump 4 and optionally to portions of the rod-like connecting element 8 a temporary prosthesis 6, which can then be conveniently replaced with a permanent prosthesis which will be fitted on an appropriately provided supporting stump of a known type or directly on the stump 4 proper once the process of stabilization of the implant 2 in the bone 3 has ended.

The peculiar aspect of the invention consists in that the stump 4 has at least one containment region 9 in which the rod-like connecting element 8 can be engaged.

Also according to the invention, the stump 4 is further provided with locking means which allow to prevent the disengagement of the rod-like connecting element 8 from the containment region 9.

Conveniently, the containment region 9 comprises one or more passages 10, which pass through the stump 4 substantially transversely to its longitudinal axis and are advantageously spaced angularly from each other around the axis 4a of the stump 4. As shown, each passage 10 can be provided for example by two openings 10a, which are provided, in mutually diametrically opposite points with respect to the axis 4a, in the outer side wall of the stump 4, and by an intermediate portion 10b, which is arranged between the openings 10a and is provided inside the stump 4. As can be seen clearly in Figures 5 and 6, the intermediate portion 10b in practice can be common to each passage 10.

With reference to the exemplary embodiments shown in particular in Figures 7, 12 and 15 to 17, each passage 10 is advantageously connected to a respective longitudinal notch 10c, which is provided along the stump 4 and is open at the end of the stump 4 that lies opposite the connecting means 5, so as to allow easy and quick insertion of the rod-like connecting element 8 in the selected passage 10. In this case, in practice, each passage 10 is provided by a concave region located at the bottom of the longitudinal notch lOc. Advantageously, means are provided for pretensioning the rod-like connecting element 8 which allow to tension it adjustably.

Preferably, as will become better apparent hereinafter, said pretensioning means are constituted by means for varying the length of the portion of the rod-like connecting element 8 that engages the containment region 9.

Conveniently, the stump 4 has engagement means for the rod-like connecting element 8 which are adapted to discharge, along a direction which is substantially parallel to the axis 4a of the stump 4, at least part of the pretensioning stresses that are transmitted from the rod-like connecting element 8 to the stump 4. It is important to point out that the engagement means are structured in such a way that the stresses that are transmitted axially to the stump 4 can provide on the implant 2 an axial traction which allows to suppress at least partially the compression loads applied to the implant 2 and consequently to the bone 3 during chewing, thus facilitating the healing of the bone and the rapid bone integration of the implant 2.

More particularly, the engagement means comprise elements for guiding the rod-like connecting element 8 which are associated with the stump 4 and define, for the rod-like connecting element 8, at least one portion whose extension has a component which is parallel to the axis 4a of the stump 4.

Advantageously, at least one of such guiding elements is arranged at the intermediate portion 10b of the passages 10 and can perform a translational motion, with respect to the stump 4, along a direction which is substantially parallel to the axis 4a in order to vary the extent of the guiding action performed on the rod-like connecting element 8.

In greater detail, said movable guiding element is preferably coupled slidingly to a sliding seat 11 , which is arranged coaxially with respect to the axis 4a of the stump 4 and in practice defines at least one portion of the intermediate portion 10b of the passages 10. Thanks to this structure, the guiding elements can be used also to tension the rod-like connecting element 8, thus providing the above mentioned pretensioning means.

As shown, the guiding elements are conveniently provided by the openings 10a in which the rod-like connecting element 8 is engaged and by a slider 12, which can be arranged between the openings 10a and can be coupled slidingly to the sliding seat 11.

The slider 12 advantageously has a guiding head 12a, which is designed to engage the portion 8a of the rod-like connecting element 8 that is located within the intermediate portion 10b and can be spaced from the openings 10a, along the sliding seat 11 and therefore along a direction which is substantially parallel to the axis 4a, in order to change the length of the portion 8a of the rod-like connecting element 8 by guiding it from the openings 10a to the guiding head 12a and consequently achieve a variation of the tension of the rod-like connecting element 8.

In greater detail, the slider 12 is provided advantageously with a region which can be actuated in order to allow its movement along the axis of the sliding seat 11. Such actuatable region comprises a threaded region

13 of the slider 12 which can engage a female thread 14 provided along a portion of the sliding seat 11.

Conveniently, at its opposite end with respect to the guiding head

12a, the slider 12 has a recess 15 for the engagement of an appropriately provided tool, for example of the Allen type, which can be used to fasten the threaded region 13 in the female thread 14 by inserting it from an inlet 11a located at an axial end of the sliding seat 11.

Conveniently, the guiding head 12a is substantially shaped like a spherical portion, in order to allow easy screwing of the threaded region 13 of the slider 12 in the female thread 14 even when the guiding head 12a is engaged with the rod-like connecting element 8. In practice, by screwing the threaded region 13 into the female thread 14 in one direction it is possible to move the slider 12 along the sliding seat 11 so as to reduce the distance of the guiding head 12a from the openings 10a, consequently reducing the tension of the rod- like connecting element 8. By screwing the threaded region 13 in the opposite direction, the guiding head 12a is moved away from the openings 10a, thus tensioning the rod-like connecting element 8.

Conveniently, in the specific case of the exemplary embodiments shown in particular in Figures 7 and 12, in order to prevent the longitudinal wings 4c formed on the stump 4 by the notches 10c from opening outwardly by flexural deformation, when the slider 12 is tightened, a containment sleeve 25 is fitted on the stump 4 and is advantageously open at its ends in order to allow access to the slider 12 from outside.

The containment sleeve 25 is provided preferably, in mutually diametrically opposite regions, with slots 26 which are designed to be arranged so as to match the passages 10 in order to be able to engage the rod-like connecting element 8.

It should be noted that the rod-like element 8 can be tensioned not only by means of the guiding elements, as described above, but also by providing pretensioning means which are interposed along the rod-like connecting element 8 and are provided by tensioning elements 20 which are adapted to vary the useful length of the rod-like connecting element 8 between two contiguous stumps 4.

As can be seen in Figure 10, the tensioning elements 20 can comprise for example threaded portions 21 , which are associated with portions of the rod-like connecting element 8 and engage respective nuts 22, which are rigidly joined together and can be tightened along the threaded portions 21 in order to cause the mutual approach or spacing of said portions of the rod- like connecting element 8.

According to another possible constructive solution, which is conceptually similar to the preceding one but is dimensionally less bulky, the nuts 22 can be replaced with a pair of coaxial tubular elements 23, which are threaded internally in order to engage by screw coupling the threaded portions 21 and are rigidly connected to each other by an intermediate actuation portion 24, which is provided preferably with an outer contoured lateral surface with flat faces for the engagement of a tool, such as a wrench, which can be used to turn the tubular elements 23 about their axis and thus cause the mutual approach or spacing of said portions of the rod-like connecting element 8. The threaded portions 21 of course can be provided directly on the portions of the connecting element 8 or can be provided by threaded pivots which are connected, in any known manner, to the free ends of the portions of the rod-like connecting element 8. Conveniently, means are provided for varying the orientation of the containment region 9 with respect to the implant 2 in order to allow correct application of the device according to the invention. Advantageously, the stump 4 comprises at least two bodies, respectively a first body 16a and a second body 16b, which are coupled to each other and are arranged along the axis 4a of the stump 4. In particular, the first body 16a can be rigidly coupled, by way of the connecting means 5, to the implant 2, while the second body 16b defines the containment region 9.

Conveniently, such means for varying the orientation of the containment region 9 with respect to the implant 2 are interposed between the first body 16a and the second body 16b and comprise means for the rotary coupling of the second body 16b about its own axis with respect to the first body 16a.

The rotary coupling means comprise advantageously a rotation seat 17, which is provided in the first body 16a, at the end thereof that lies opposite the one that can be connected to the implant 2, and accommodates an end portion of the second body 16b so that it can rotate about its own axis. Conveniently, means for delimiting the rotation of the end portion of the second body 16b within the rotation seat 17 can be provided.

As shown in the sectional view of Figure 5, such delimiting means can be constituted for example by a protrusion 18, which protrudes from the internal lateral surface of the rotation seat 17 and engages a groove 19 which is provided in the outer side wall of the end portion of the second body 16b and covers a limited arc around the axis of the second body 16b.

As can be seen, the protrusion 18 allows further to provide a shoulder which, by engaging the surface of the groove 19, prevents the axial disengagement of the end portion of the second body 16b from the rotation seat 17.

Advantageously, the first body 16a, or more generally the portion of the stump 4 that lies proximate to the connecting means 5, is substantially frustum-shaped, with side walls which converge toward their end which can be connected to the implant 2. As shown, the connecting means 5 comprise for example a screw element 5a, which is fixed to one end of the stump 4 and can engage in a threaded hole 2a formed coaxial within the implant 2.

Advantageously, the stump 4 has, at its opposite end with respect to the screw element 5a, at least one diametrical notch 27, which can be engaged by a tool, such as for example a screwdriver, which allows to screw the screw element 5a into the threaded hole 2a.

Likewise, in the embodiments shown in particular in Figures 7 and 9, the stump 4 conveniently has, on the bottom of the sliding seat 11 , at the opposite side with respect to the inlet 11a, a recess 30 which has a polygonal plan shape for the engagement of a tool adapted to screw the screw element 5a into the threaded hole 2a.

Advantageously, around the screw element 5a there is also, on the stump 4, a hollow 31 which is designed to accommodate, when the stump 4 is coupled to the implant 2, a protrusion 32 which is provided on the implant 2 at the inlet of the threaded hole 2a and is shaped appropriately, on its outer lateral surface, so as to allow the engagement of a tool, for example of the wrench type, which is adapted to screw the implant 2 into the bone 3.

It is of course possible to provide the stump 4 monolithically with the implant 2. This embodiment is particularly adapted in the case of transmucosal or single-phase implants such as the one shown in Figure 15 and generally designated by the reference numeral Ia.

In this case, the implant 2 can be provided by an element which can be screwed on and is provided with a self-tapping thread 2a which can be inserted within a hole formed within the bone in the dental arch 3. Advantageously, as clearly illustrated in the embodiments shown in

Figures 15 to 17, in particular types of application such as the replacement of the incisor teeth, the stump 4 can have at least one region which tapers toward the opposite end with respect to the one connected to the implant 2.

For the sake of completeness, it should be added that the means for locking the rod-like connecting element 8 can comprise a fastening element which can engage the portion 8a of the rod-like connecting element 8 that is accommodated within the passage 10 in order to fasten said portion 8a between the fastening element and the stump 4.

As can be seen clearly in the illustrated examples, the fastening element can be obtained effectively from the slider 12.

The application of the invention is as follows.

Initially, the implants 2 to be stabilized are inserted in appropriately provided holes provided within the bone of the dental arch.

As shown, the corresponding stump 4 is then associated with each implant 2 by screwing the screw element 5a into the threaded hole 2a of the implant 2.

Once application of the stumps 4 has ended, as described above, a rod-like connecting element 8 is made to pass within the containment regions 9 of the several stumps 4, inserting it in the passages 10, for example by means of the longitudinal notches 10c, if provided. Optionally with the aid of the means for varying the orientation of the containment region 9, the passages 10 are arranged so that the rod-like connecting element 8 can follow correctly the shape of the dental arch.

In practice, as can be seen in Figure 1, the passages 10 crossed by the rod-like connecting element 8 are oriented in a distal-medial or medial- distal direction.

The rod-like connecting element 8 is thus coupled firmly to the stumps 4 and tensioned by guiding it, by the selected extent, by way of the movement of the slider 12 of the several stumps 4, along the corresponding sliding seat 11.

Optionally, before fastening the slider 12, the containment sleeve 25 is fitted coaxially on the stump 4 in order to prevent the wings 4c from opening outwardly.

It should be noted that the rod-like connecting element 8 can also be tensioned, especially in the case of implants 2 which are very widely spaced, by using the tension elements 20 and more particularly by screwing the nuts 22 or the tubular elements 23 on the threaded portions 21.

Having thus completed the connection among the several stumps 4, it is possible to apply to the stumps 4 and optionally to the rod-like connecting element 8 one or more temporary prostheses 6, offering evident aesthetic and functional advantages even during the period required for stabilization of the implants 2.

Once an adequate stabilization of the implants 2 has been achieved, the temporary prosthesis 6 and the several stumps 4 can be removed from the implants 2 together with the rod-like connecting element 8 and can be replaced with the permanent prostheses and stumps.

As an alternative, it is also possible to leave the stumps 4 coupled to the implants 2 and fit the permanent prosthesis directly on said stumps, optionally after removing the rod-like connecting element 8, since the use of permanent stumps is not necessary. All the characteristics of the invention indicated above as advantageous, convenient or the like may also be omitted or be replaced with equivalents.

The individual characteristics described with reference to general teachings or particular embodiments may all be present in other embodiments or may replace characteristics in these embodiments.

In practice it has been found that the invention fully achieves the intended aim and objects, and in particular the fact is stressed that it allows to provide a structure for connecting to each other the several stumps of different implants fixed to the bone which can distribute chewing loads in order to allow effective and quick stabilization of the implants.

Another important advantage of the invention is that it allows to generate a traction preloading on the implants which can lead to a reduction of the resultant of the forces that act on said implants and consequently on the bone during chewing.

The invention thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims.

Thus, for example, as shown in Figures 18 to 20, the containment region 9 can be provided by a collar 30, which can be fitted around the stump 4 by means of an insertion seat 30a.

The insertion seat 30a and the containment region 9 are connected to each other by means of a connecting region 31 ; in this particular case, the locking means are adapted to deform at least one deformable portion 32 of the collar 30 in order to fasten the portion 8a of the rod-like connecting element 8 in engagement with the containment region 9 against the stump 4 so as to achieve its locking and at the same time its tensioning. In this regard, the collar 30 may have two abutment wings 33 which can be moved mutually apart or closer to deform on command its deformable portion 32, which in this embodiment is constituted in practice by the collar 30 in its entirety. Conveniently, the collar 30 can be associated with an adjustment screw 34, which is constituted for example by a threaded stem 34a which can engage a locking bolt 34b and acts between the two abutment wings 33; the adjustment screw 34 can be operated in order to deform such deformable portion and move the collar 30 into the position for locking and tensioning the rod-like connecting element 8.

There is nothing to prevent, moreover, as shown in the exploded view of Figure 21, the containment region 9 from being made by a cut 109 which lies transversally with respect to the axis 4a of the stump 4. At the end portions 109a of the transverse cut 109 the openings 10a are provided. In this case, the slider 12 can be associated to a threaded seat 110 which is provided on the outer side wall of the stump 4 and in a central position along the longitudinal extension of the transverse cut 109.

As shown, the slider 12 can be moved along a direction which is perpendicular with respect to the axis 4a of the stump 4 so as to allow locking and tensioning of the rod-like connecting element 8. It has further been observed that, if the stump can be associated to the implant by screwing the screw element, it is possible to align, before positioning the rod-like element, the containment regions so as to ensure during use an optimal extension of the rod-like element.

In practice, the materials used, so long as they are compatible with the specific use, as well as the dimensions and shapes, may be any according to requirements.

All the details may further be replaced with other technically equivalent elements.

The disclosures in Italian Patent Application No. VR2006A000049 from which this application claims priority are incorporated herein by reference.

Claims

1. A stabilizing device for intraosteal implants, comprising a pin- shaped stump which can be associated, at one of its ends, by way of connecting means, with an implant to be stabilized, which is fixed to the bone of the dental arch and can be connected to at least one other contiguous stump by means of at least one rod-like connecting element, characterized in that said stump has at least one containment region for said at least one rod-like connecting element and means for locking said at least one rod-like connecting element in a condition in which it engages said at least one containment region.

2. The device according to claim 1, characterized in that it comprises means for pretensioning said at least one rod-like connecting element.

3. The device according to one or more of the preceding claims, characterized in that said at least one containment region is provided by a collar, which can be fitted around said stump through an insertion seat, a region for connection between said insertion seat and said containment region being provided, said locking means being adapted to deform at least one deformable portion of said collar in order to fasten the portion of said at least one rod-like connecting element so that it engages said at least one containment region against said stump.

4. The device according to one or more of the preceding claims, characterized in that said at least one containment region comprises at least one passage which passes through said stump substantially transversely to its longitudinal axis.

5. The device according to one or more of the preceding claims, characterized in that said at least one containment region comprises at least two passages which pass through said stump substantially transversely to its longitudinal axis and are angularly mutually spaced around the axis of said stump.

6. The device according to one or more of the preceding claims, characterized in that said stump comprises means for the engagement of said at least one rod-like connecting element which are adapted to discharge, along a direction which is substantially parallel to the axis of said stump, at least part of the pretensioning stresses that are transmitted from said at least one rod-like connecting element to said stump.

7. The device according to one or more of the preceding claims, characterized in that said rod-like connecting element is flexible.

8. The device according to one or more of the preceding claims, characterized in that said engagement means comprise elements for guiding said at least one rod-like connecting element which are associated with said stump and define, for said at least one rod-like connecting element, at least one portion whose extension has a component which is parallel to the axis of said stump.

9. The device according to one or more of the preceding claims, characterized in that said pretensioning means are interposed along said at least one rod-like connecting element and comprise tensioning elements which are adapted to vary the useful length of said at least one rod-like connecting element between a pair of contiguous stumps.

10. The device according to one or more of the preceding claims, characterized in that said tensioning elements comprise threaded portions which are associated with portions of said at least one rod-like connecting element and engage a pair of tubular elements which have coinciding axes, are internally threaded, are rigidly connected one another, and can be fastened onto said threaded portions in order to vary the tension of said at least one rod-like connecting element.

11. The device according to one or more of the preceding claims, characterized in that said pretensioning means comprise means for varying the length of the portion of said at least one rod-like connecting element which engages said at least one containment region.

12. The device according to one or more of the preceding claims, characterized in that said pretensioning means comprise said guiding elements.

13. The device according to one or more of the preceding claims, characterized in that said at least one passage comprises a pair of openings which are provided at points which are mutually diametrically opposite with respect to the axis of said stump in the outer side wall of said stump and an intermediate portion, which is arranged between said pair of openings and is provided inside said stump, at least one of said guiding elements being arranged at said intermediate portion of said at least one passage.

14. The device according to one or more of the preceding claims, characterized in that said at least one passage is connected to a respective longitudinal notch which is provided along said stump and is open at the end of said stump that lies opposite said connecting means.

15. The device according to one or more of the preceding claims, characterized in that said at least one of said guiding elements can perform a translational motion, with respect to said stump, along a direction which is substantially parallel to the axis of said stump.

16. The device according to one or more of the preceding claims, characterized in that said guiding elements comprise said pair of openings and a slider, which is arranged between said pair of openings and can be coupled slidingly to said sliding seat, said slider having a guiding head which can engage the portion of said at least one rod-like connecting element that engages said intermediate portion of said at least one passage, said guiding head being movable away from said pair of openings along a direction which is substantially parallel to the axis of said stump.

17. The device according to one or more of the preceding claims, characterized in that said pretensioning means comprise an engagement grub screw, which is adapted to engage the portion of said rod-like connecting element that engages said intermediate portion of said at least one passage and can move along a movement portion which is arranged transversely with respect to the longitudinal axis of said stump.

18. The device according to one or more of the preceding claims, characterized in that it comprises means for varying the orientation of said at least one containment region with respect to said implant.

19. The device according to one or more of the preceding claims, characterized in that said connection means comprise a screw element which is fixed to one end of said stump and can engage in a threaded hole provided coaxially within said implant.

20. The device according to one or more of the preceding claims, characterized in that said stump and said implant to be stabilized are provided monolithically.

21. The device according to one or more of the preceding claims, characterized in that said stump, following the stabilization of said implant, can be disengaged from said implant and can be replaced with another stump adapted to support at least one permanent prosthesis.

22. The device according to one or more of the preceding claims, characterized in that said locking means comprise a fastening element, which can engage the portion of said at least one rod-like connecting element that is accommodated in said at least one passage for fastening of said portion between said fastening element and said stump.

23. The device according to one or more of the preceding claims, characterized in that said fastening element is provided by said slider.

24. The device according to one or more of the preceding claims, characterized in that it comprises a containment sleeve which can be fitted on the outside of said stump.

25. The device according to one or more of the preceding claims, characterized in that said containment sleeve has, in diametrically mutually opposite regions, slots which are designed to be arranged so as to correspond to said at least one passage.