360 DEGREES ROTATIONAL AND LOCKING SYSTEM FOR A PRE-ANGLED STUMP IN AN ORAL IMPLANTATION

Abstract: Implant allowing lacking of the orientation about 360 of a pre-angled stump for oral implantation of tooth, involving: a recessed implant to be fixed in the jaw (4) having a hollow upwardly portion providing at least one polygonal portion (p) and, a pre-angled stump (3) fixable to the implant in a determined rotational orientation, for supporting with the pre-angled stump (m) a tooth tilted with respect to the axis of the implant; a clamping screw (1) to clamp said stump (3) implant (4) in a rotational position, characterized by the fact that the: said stump (3) is connected to the said implant (4) axially by means of an intermediate coupling sleeve (2); said intermediate coupling sleeve (2) has: an external lower polygonal part for the insertion in the polygonal portion (p) of the said implant (4), and an upper external conical part with larger upper part, a through-hole for the said clamping screw (1), which abuts onto the superior surface of said larger base; in the said stump (3), there is a through-hole with conical hole in center (c) perpendicular to the support base of the stump, for the housing of the conical correspondent portion (c) of the said intermediate coupling sleeve (2).

Description: DESCRIPTION 360° DEGREES ROTATIONAL AND LOCKING SYSTEM FOR A PRE-ANGLED STUMP IN AN ORAL IMPLANTATION. Technical Field In the field of oral implantation after having carried out the surgical phase for the insertion within the bone of the bi- phasic implants, after the recovery period, the prosthetic phase is carried out ; to carry out thi.s phase a stump that may be of different forms and sizes is appl ied to the osteointegrated i m p l a n t . Background Art When the problem arises that we are unable to obtain a correct and in line prosthesis with the anatomy of the mouth with a straight stump, we must resort to pre-angled stumps that allow different parallelism corrections. At present in trade there are pre-angled stumps that do not have the possibility to be orientated i n any wanted position but. only in a few points that do not always ensure the perfect alignment of the prosthesis between stump and implant. This derives from the fact that the stump is fitted between the implant with a polygonal coupling. i ntend ing , for polygonal, any bevel l ing joint conformat ion . i ndependent ol the number of sides or of their conformation. includi ng t herefore toothing or groovi ng. Di sclosure of I nvent ion The new locking implant for pre-angled stump, according to this i nvention , allows to orientate the stump in any position. This implant is made from four components: 1 ) lockin g screw: 2) sleeve with polygonal underside and conical cylindrical upperside having a maximum diameter in the upper part ; 3 ) pre-angled stump, with conical hole in the center perpendicular to the support base of the stump, for housing the conical sleeve; 4) implant , having the internal upper part composed from a polygonal seat for the precise coupling of the underside of the sleeve and a thread for the screwing of the locking screw. The locki ng screw is inserted in the conical polygonal sleeve and these two components are inserted in the conical hole of the pre- angled stump in order that the polygonal part of the sleeve comes out of the base support of the stump. The complete stump, formed in this way, is coupled to the implant by inserting the protrusive polygonal part of the sleeve in the polygonal part of the implant and simultaneously tightening the locking screw on the internal thread of the implant until the support bases of the implant and of the stump are almost in contact with each other, therefore al lowing the free rotatation of the stump . Once the optimal orientation of the pre-angled stump is established , the locking screw is tightened ful ly until obtaining the locking of the conical coupling between the conical sleeve and stump with conical seat . In this way even i f the locking screw became unscrewed and the stump became disconnected, the sleeve and the stu mp would remain blocked between them, allowing the repl acement of the stump i n t he various proceedings for the realization of the prosthesis, keeping the same orientation previously fixed. With this implant, once the prosthesis is carried out . the stump is remit ted in the implant t ightening it with the locking screw, in the same position in which we found it before it became disconnected. Figure 1 represents the system of the implant according to the invention, in which the continuous dotted with the arrow indicates the correct juxtaposition-superposition of the axial insertion of the four pieces that form the system of the implant going from bottom to top; - implant to insert in the jaw (4); - pre-angled stump (3 ) leaning axially on the upper part of the implant (4 ); - graft sleeve between and within the two. for the axial connection (2) ; - locking screw of the whole ( 1 ) acting on the sleeve (2) and screwing into the implant (4). With this orientation locking system of the pre-angled stump able to rotate a possible 360°. this gives the physician the possibility to orientate the pre-angulation of the stump to a point where it is retained most suitable for the perfect success of the prosthesis, thus avoiding them to work on the stump to adapt it necessarily, weakening the mechanical structure as with the present pre-angled stumps exist ing in trade.

Claims: Claims I. Locking system of 360° orientation of the pre-angled st ump for oral implantation of the tooth, of the type involving: - a recessed implant destined to be fixed in the bone of the jaw (4), where the said hollow provides at least one polygonal portion (p) upwardly and - a pre-angled stump (3) fixable to the implant in a determined position of rotational orientation, for support in the respective stump (in) a tilted tooth in respect to the axis of the implant. - a clamping screw (1) of the said stump (3) in the said implant (4) in a determined rotational position, characterized by the fact that: • said stump (3) is connected to the said implant (4) axially by means of an intermediate coupling sleeve (2); • said intermediate coupling sleeve (2) has: - a lower external polygonal part for the insertion in the polygonal portion (p) of the said implant (4), - and an upper external conical part with a larger upper base. - a through-hole lor the said clamping screw (1). which abuts onto the superior surface of said larger base; • in the said stump (3). there is a through-hole with conical hole in center (c) perpendicular to the support base of the stump, for the housing of the corresponding conical portion (c) of said intermediate coupling sleeve (2): * in a such a way that after having inserted the said implant (4) into the jaw. it is possible to clamp with the said screw (1) the said sleeve and the said stump (3) in the final orientation. through the respective polygonal coupling (p) and conical coupling (c), against and within the said implant (4), until the conical part (c) of the said sleeve (2) joins firmly and rigidly in the said stump (3), and then unscrew the aid stump (3) with the said sleeve (2) fixed in it, for the installation of the tooth in the said stump (m) and successively remounting all of it by means of said polygonal coupling of the said sleeve (2) that protrudes downwardly from the said stump (3). 2 System of implant for oral implantation of the tooth, of the type involving: - a recessed implant destined to be fixed in the bone of the jaw (4), where the said hollow upwardly provides at least one polygonal portion (p) and - a pre-angled body stump (3) fixable to the implant in a certain position of rotational orientation, to support in the respective stump (m) a tilted tooth in respect to the axis of the implant. - a clamping screw (1) of the said stump (3) in the said implant (4) in a certain rotational position, characterized by the fact that the • said stump (3) is connected to the said implant (4) axially by means of an intermediate coupling sleeve (2): • said intermediate coupling sleeve (2) as: - an external lower polygonal part for the insertion in the polygonal portion (p) of the said implant (4). - anil an upper external conical part with a iarger upper base. - a through-hole lor the said clamping screw (1). which abuts onto the superior surface of said larger base; • in the said stump (3), there is a through-hole with conical hole in center (c) perpendicular to the support base of the stump, for the housing of the correspondent conical portion (c) of the said intermediate coupling sleeve (2).

Inventors: MORO SERGIO, MORO, SERGIO
Applicants: MORO SERGIO, ORALPLANT S R L, ORALPLANT S.R.L.
Application year: 1993
Main classification: A61C8
IPC codes: A61C8, H02K41