FR3017046A1 - SYSTEM FOR OBTAINING INTRAORAL SCAN DATA - Google Patents

Abstract

The invention relates to a system for obtaining intraoral data of edentulous or partially toothless jaws, the system comprising a plurality of abutments (10), each abutment being attached to an implant of a dental arch (1, 2). ), characterized in that it also comprises a scanable wire (20) extending along the dental arch and being supported against at least two pillars. The invention also relates to a pillar adapted for the implementation of a system as described above, characterized in that it has on a side wall a groove (11, 12) in which is housed the wire or the connecting means. Application to intraoral 3D impression taking.

Description

TECHNICAL FIELD AND STATE OF THE ART The invention relates to a system for obtaining intra-oral scanning data of edentulous or partially edentated jaws, and more specifically a system comprising a plurality of pillars, each pillar being fixed to a implant of a dental arch (lower or upper). Such a system is commonly used with a scanner or scanning camera to establish an intraoral 3D optical impression, and accurately determine the spatial position of the implants relative to the jaw. The impression is then used in particular for the design, manufacture and implementation of a prosthesis adapted to the patient. The document D1 = WO 2013/041382 describes such a system comprising in particular a scan pillar extended by one or more scannable additional bodies whose external appearance is quite close to that of a tooth; each additional body is detachably connected to a pillar and / or to another additional body by a plug-in connection in the pillar. The Dl solution is complex to implement because it assumes the assembly and placement within the patient's mouth of a plurality of small members that are the additional bodies and the removable connectors. . DESCRIPTION OF THE INVENTION The invention proposes an alternative solution to that proposed in document D1, which is simpler to implement inside the mouth of a patient. More specifically, the invention proposes a system for impression taking, moreover in accordance with the known system of D1 and characterized in that it also comprises a scannable wire extending along the dental arch and being maintained. in support against at least two pillars. By scannable wire is obviously meant a recognizable wire, visible for an impression taking apparatus of any type: impression taking apparatus in the field of visible, infrared, X-ray, etc., imaging apparatus by magnetic resonance (MRI), radio detection device (high frequency, ultrasound, etc.). Thus, according to the invention, the wire and the plurality of pillars which hold it in position together form a three-dimensional marker extending all along the dental arch, and allow a particularly precise impression taking. Moreover, and including for a largely edentulous jaw, in addition to the usual pillars, the system according to the invention comprises a single complementary scannable element, namely a wire. Finally, the implementation of the system is simple: the pillars are positioned on the implants, as in the prior art; then, according to the invention, the wire is positioned in abutment against the wall of the pillars. In one example, the yarn is a flexible yarn, for example of plastic material, arranged to fit the shape of the dental arch. Thus, the wire has in any plane perpendicular to the axis of the wire an elasticity such that the wire is naturally pressed against the abutments and / or teeth of the dental arch.

In another example, the wire is held in abutment against a pillar by a removable connection means such as an elastic ring. The connecting means ensures that the thread is immobilized during the entire impression phase and can not be moved by undesired movement of the patient. In an exemplary embodiment, the connecting means is a double elastic ring, forming an eight or two contiguous rings. The diameter of one of the rings is chosen slightly smaller than the diameter of the wire so as to be held in position on the wire by compression; the diameter of the other of the rings is similarly chosen according to the diameter of the pillars. These fixing means have the advantage of simplicity, and they can easily be moved along the wire to be positioned exactly where they are useful, at the height of the pillars in particular or at the height of a tooth, and this without tools or additional means. In known manner, in D1 for example, a pillar has a generally frustoconical shape. According to one embodiment of the invention, a pillar additionally has on a side wall a groove in which is housed the wire or the connecting means. The position of the wire or the connecting means on the height of a pillar is thus perfectly defined, and the wire can be positioned and repositioned several times at the same place with precision.

The scannable wire used is preferably a flexible wire, for example made of a plastic material; its elasticity allows it to marry the shape of the dental arch by coming in support against the pillars. More preferably, the wire has a central core made of a photopolymerizable composite material and the central core is covered with a sheath of translucent plastic material, for example nylon. In this case, after placement first against the pillars inside the patient's mouth, the wire is illuminated in a known manner so that the photopolymerizable composite material, initially pasty, hardens. The shape (possibly non-flat) of the wire is thus fixed in accordance with the dental arch of the patient; the shape obtained is not necessarily plane. The shaped wire can then be removed and repositioned as many times as necessary, with a particularly precise and identical positioning from one time to the next. More preferably, an outer section of the wire and / or a section of the core core of the wire has (s) a polygonal section, for example a trapezoidal section. A polygonal section makes wire identification easier and more accurate by scanning tools. The section of the central core and the outer section of the wire may be different, but at least one of these sections is chosen polygonal. The shape and / or dimensions of the section of the central core may be variable along the wire to distinguish a first end of the wire from a second end of the wire. Finally, the wire may have on its outer surface a longitudinal marking distinguishing a first end of a second end of the wire. For example, two different shapes are drawn or etched on the side wall of the son. By indicating to the scanner the order of appearance of the shapes during scanning, the measuring tool accurately determines the orientation of the wire. The invention also relates to a pillar adapted for implementing a system for taking the impression as described above. Like an anterior pillar, a pillar according to the invention has a generally frustoconical shape, well suited for scanner detection. A pillar according to the invention is distinguished from an anterior pillar in that it has on a side wall a groove in which is housed the wire or the connecting means. Thus, a pillar according to the invention can serve as a healing screw after implant placement, as fixation for a temporary prosthesis, and also as a reference pillar and as an anchor point for a marker wire for impression taking. . According to one embodiment, the groove extends along an axis positioned in a plane substantially perpendicular to a longitudinal axis of the pillar, groove adapted to receive and hold in position a scannable wire. According to another embodiment, the groove extends in a plane substantially perpendicular to a longitudinal axis of the pillar, extends around the perimeter of the side wall of the pillar and has a substantially annular shape adapted to receive a connecting means, such as for example an elastic ring.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood, and other characteristics and advantages of the invention will emerge in the light of the following description of exemplary embodiments of systems according to the invention for the taking of mouth. These examples are given in a non-limiting manner. The description is to be read in conjunction with the accompanying drawings in which: Figs. 1a, 1b are top views of systems according to the invention, Figs. 2a, 2b, 2c are partial profile views of systems according to 3a, 3b, 3c show examples of sections of an essential element of a system according to the invention, and FIG. 4 is a partial front view of the element of FIGS. As previously mentioned, the invention relates to a system for obtaining intraoral data of edentulous or partially edentulous jaws; the system comprises a plurality of abutments, each abutment being attached to an implant of a dental arch 1, 2. In known manner, the implants may be fixed perpendicular to a main plane of the arch (plane of the sheet for Figures la, lb), or inclined, according to the needs of the patient. Preferably, depending on the position and direction of the implant, the pillars 10 are arranged to all extend in substantially parallel directions, preferably in directions perpendicular to the main plane of the arch.

The system according to the invention is characterized in that it also comprises a scanable wire 20 extending along the dental arch and being held in abutment against at least two pillars. In the example of FIG. 1a of a totally edentulous dental arch 1, the wire has a length substantially equal to that of the dental arch and abuts on five pillars 10. In the example of FIG. a partially edentulous arch 2, the wire also has a length between the length of the edentulous zone and the length of the dental arch; it bears on two pillars 10 and on the teeth present on the arch. The length of the wire can be chosen according to the length of the arcade portion of which it is desired to obtain an imprint. The yarn 20 is a flexible yarn having sufficient elasticity in any plane perpendicular to the axis of the yarn to come to bear against the abutments and / or the teeth and thus come to conform to the shape of the dental arch (FIG. .the). The thread may be held (FIG. 1b) in abutment against one or each pillar by a detachable connection means, for example an elastic ring. Figure 3b shows a double elastic ring type connecting means 30; of general shape in eight, a ring 31 is positioned in force on the wire 10 to maintain, and the other ring 32 is positioned in force on the pillar 10. Compared to a simple elastic ring, a double-elastic ring ensures a better maintenance of the wire against the pillar. The wire 20 is made of a plastic material to be deformable to allow it to be shaped and placed in place. In FIGS. 3a, 3b, 3c, the wire has a central core 21 made of a photopolymerizable material, core covered with a sheath 22 of translucent plastic material. In Figure 3b, the core 21 has a circular section and the sheath 22 has a trapezoidal outer section. The presence of flat faces along the wire facilitates the making of marks 23, 24 along the wire (FIG 4). The marks 23, 24 are different from each other, to identify the ends and the direction of the wire. In Figure 3a, the core 21 has a trapezoidal section and the sheath 22 has a circular outer section or more generally ovoid. The sheath thus has a smooth outer surface, less offensive to the mucous membranes of the patient. In FIG. 3c, the core 21 has a triangular section and the sheath 22 has any unsigned outer section. Finally, the wire may have a groove 25 (FIG 4) for a more precise positioning of the connecting means along the wire.

The wire or the sheath of the wire are made of a material both flexible enough to be able to conform the yarn in the yoke, and hard enough not to deform at the surface at the yarn bearing zone against a pillar or a yarn. tooth.

A pillar 10 according to the invention is characterized in that it has on a side wall a groove 11, 12 in which is housed the wire or the connecting means. In the example of Figures 2a, 2b, the groove 11 extends along an axis positioned in a plane substantially perpendicular to a longitudinal axis (Y) of the pillar; the shape of the groove, which is substantially linear, makes it possible to clip the wire directly into the groove (FIG 2a). As well, if a connecting means 30 is used, it can become lodged in the groove 11 (FIG 2b). In the example of Figure 3c, the groove 12 extends in a plane substantially perpendicular to a longitudinal axis of the pillar, extends around the perimeter of the side wall of the pillar and has a substantially annular shape; such a shape is well adapted to immobilize a ring all around the perimeter of the pillar.

Claims (12)

CLAIMS1.System for obtaining intraoral data of edentulous or partially edentulous jaws, system comprising a plurality of pillars (10), each pillar being attached to an implant of a dental arch (1, 2), characterized in that it also comprises a scanable wire (20) extending along the dental arch and being supported against at least two pillars. 2. System according to one of the preceding claims wherein the wire (20) is a flexible wire, arranged to match the shape of the dental arch. 3. System according to claim 1 wherein the wire (20) is held in abutment against a pillar (10) by a connecting means (30) removable. 15 4. System according to one of the preceding claims wherein the removable connection means is an elastic ring or a double elastic ring (30). 5. System according to one of the preceding claims wherein the wire (20) is made of a plastic material. 20 6. System according to one of the preceding claims wherein the wire (20) has a central core (21) made of a thermosetting material covered with a sheath (22) of plastic material. 7. System according to one of the preceding claims wherein an outer section of the wire and / or a section of the central core of the wire has (s) a polygonal section, for example a trapezoidal section. 8.System according to one of the preceding claims wherein the wire has on its outer surface a marking (23, 24) longitudinally distinguishing a first end of a second end of the wire. 9. System according to one of claims 3 to 8 wherein a pillar (10) has on a side wall a groove (11, 12) 5 in which is housed the wire or the connecting means. 10. Pillar (10) adapted for the implementation of a system according to one of the preceding claims, characterized in that it has on a side wall a groove (11, 12) in which is housed the wire or the connecting means. 10 11. A pillar according to claim 10 wherein the groove (11) extends along an axis positioned in a plane substantially perpendicular to a longitudinal axis of the pillar groove adapted to receive and hold in position a scannable wire. 12. A pillar according to claim 10 wherein the groove (12) 15 extends in a plane substantially perpendicular to a longitudinal axis of the pillar, extends around the perimeter of the side wall of the pillar and has a substantially annular shape adapted to receive a link.