WO2013041382A1

WO2013041382A1 - Array, abutment and method for acquiring intraoral scan data

Info

Publication number: WO2013041382A1
Application number: PCT/EP2012/067402
Authority: WO
Inventors: Roland Benz
Original assignee: Bredent Gmbh & Co. Kg
Priority date: 2011-09-07
Filing date: 2012-09-06
Publication date: 2013-03-28
Also published as: DE102011053336A1

Abstract

In order to acquire a digital comprehensive representation of the constellation of an array of abutments in tooth gaps of a patient using a scanning device for intraoral scanning, abutments having extensions attached thereto, in particular additional bodies spaced apart from the abutments, and abutments therefor, and a method for acquiring the scan data are described.

Description

ARRANGEMENT, ABUTMENT AND METHOD FOR OBTAINING INTRAORAL SCANDATES

The invention relates to an arrangement and a method for obtaining intraoral scans of edentulous or partially edentulous pines using an abutment designed for attachment to a jaw implant, and to an abutment therefor.

For the dental prosthetic restoration of patients u. a. common to use one or more implants in the jawbone at the site of one or more teeth. As a preliminary stage for the modeling of a prosthesis, it is known to attach an abutment to the implant inserted in the jaw and to scan in the mouth of the patient the jaw area in which the abutment is located and to use the scan data for the modeling. The scan data describes the position of the abutment in the vicinity of adjacent teeth. The abutment, which may be the abutment to be used for the future dental prosthesis, or a scan abutment specially designed for the scan, has characteristic geometric scan structures which permit a unique positional assignment in a subsequent dental model used.

DE 20 2010 017 228 U1 describes a scanbody, which serves as an abutment for the scanning process and which project a main body with several, to a small extent radially to several sides beyond the contour of the main body and in each case are designed differently from each other. In a scanbody known from WO 2010/108919 A2, plane detection surfaces and curved detection surfaces are formed on a detection section. A method for the measurement of dental restorations is described in EP 1 618 853 A1, in which the upper side of the gingiva surrounding the scan abutment is indirectly determined in a camera mount, that a compensation part has an upper side which is easily recognizable by a measuring camera and with which Bottom is applied directly to the gingiva. The plate-shaped or saddle-shaped compensating part is held on a scan abutment, by means of which the recordings of the measuring camera position and orientation of the implant can be determined. A comparable method is known from EP 1 618 854 A1.

Intra-oral scanning uses devices that have a relatively small field of view. For a complete acquisition of the geometry in the implant area, therefore, recordings with different viewing angles and coverage areas are executed in several scan passes, and the scan data thereby obtained is combined by computer programs to form an overall image representation. The merge makes use of matching structures in overlapping areas of different recordings. It can be seen that as the length of over several tooth positions contiguous toothless jaw sections increases, the precision of the merged overall image representation decreases.

It is an object of the present invention to specify an abutment arrangement, an abutment therefor and a method for obtaining scan data for improved precision of the overall image representation. Solutions according to the invention are described in the independent claims. The dependent claims contain advantageous refinements and developments of the invention. The invention takes advantage of the finding that at toothless portions between abutments and teeth or between adjacent abutments, the rounded surface of the gingiva does not provide clear structures for the scans and the merging of the scan data. By means of the projection provided according to the invention with its own scannable auxiliary structures, further characteristic partial information can be obtained in the scan data for combining them with simple means.

As an abutment, an occlusally protruding body projecting occlusally from the implant anchored in the jaw and fixed on the implant for scanning, which has scanning structures in its usual form, determines the position and orientation of the implant from scanned data enable and favor a scanning device. Different from such scan structures of the abutment, the abutment which extends away from the abutment and extends beyond the extent of a single tooth gap is at least one extension in the case of the abutment attached to the implant in the approximal direction of progression of the mandibular arch.

The scannable auxiliary structures are at least partially spaced in the direction of the arch of the mandible so far from the abutment that they protrude beyond a thought about the abutment replacement tooth shape out. Replacement tooth forms are commonly used in digitally assisted dental prosthetics and lie z. B. as records in dental libraries before. The extension of the extension from an occlusal center axis of the abutment in the direction of the arch of the mandibular arch is preferably more than 1.5 times the largest diameter of the abutment. ment in this direction. The scannable auxiliary structures are advantageously at least partially in the direction of the arch of the arch away by at least 6 mm from the longitudinal axis of the abutment abutments, which is particularly important for positions of the abutment and the extension in the molars and the premolars.

The auxiliary structures can be configured and optimized for the scanning device and / or the type of merging of scan data. In particular, the auxiliary structures may have corners and / or edges.

Preferably, the extension forms an additional body next to the abutment. The additional body is advantageously offset from the abutment, in particular by a connecting piece spaced therefrom. The connecting piece advantageously forms a constriction between the abutment and the additional body, whereby advantageously masking of the scanning structures of the abutment can be largely avoided. The additional body can be simulated schematically in an advantageous embodiment of a tooth shape. This takes into account, in a particularly advantageous manner, that the algorithms in the programs used for merging scan data are prepared in particular for the constellation with teeth adjacent to the abutments and the utilization of the part obtained by scan detection of the teeth.

The extension can be made in one piece with the abutment, wherein as the abutment while the base body is considered, which would also be used for the recovery of scan data in a single tooth gap. Preferably, the extension, in particular in the form of the aforementioned additional body, releasably connected to the abutment. For this purpose, the abutment advantageously has connection structures for the temporary attachment of the extension the abutment. An attachment of the extension to the abutment can be given in particular by a plug connection, preferably with a direction transverse to a longitudinal axis of the abutment plugging direction. To secure against rotation about the plug-in direction, the connections can have torsion-resistant, non-round cross-sections.

The invention is illustrated below with reference to preferred embodiments with reference to the figures still in detail. Showing:

1 an abutment with additional bodies,

2 a first arrangement with two abutments, FIG. 3 scan detection areas to FIG. 2, FIG.

4 shows a second arrangement with two abutments,

5 shows an embodiment with successively arranged additional bodies,

6 is a flowchart.

1 shows an abutment AB and additional body ZK, which can be connected to the abutment AB via connecting elements VE.

The abutment AB has a substantially conventional form, in which a socket SO is formed for connection to the upper section of an implant so as to be non-rotatable about a longitudinal axis LA; may have a hexagonal cross-section corresponding to the shape of an upper opening in the implant. Along the longitudinal axis LA of the abutment AB a screw opening SL is formed, through which a fastening screw can be inserted, with which the abutment for the duration of the scheduled scans fixed and fixed in a defined orientation with substantially occlusal alignment of the longitudinal axis LA on an implant. In the example shown, the abutment has an upwardly conically tapering circular cone shape, which on one side has a flattening FL from the top side OF remote from the implant up to a step ST. The upper side OF, the circumferential top edge OK of which is flanked by the surface FL, the surface FL with the side edges FK, and the step ST with the circular arc edge and the circular arc chord at the inner angle can form advantageous characteristic scanning structures which reproduce well when scanning the abutment from different directions form recognizable and assignable structures within the scan data. For the execution of scans a variety of different abutment forms are known per se, which each have scan structures which the position of the abutment in the direction of the longitudinal axis LA, the angular position about the longitudinal axis LA, the inclination of the longitudinal axis LA and other position-relevant parameters when performing scans on the scan data. The shape of the abutment in Fig. 1 is to be understood as exemplary only.

On the abutment AB according to FIG. 1, receptacles VA are formed in side surfaces of the cone shape, which serve for the mechanical connection of one or two additional bodies ZK to the abutment AB. The receptacles VA can be formed, for example, as holes or as threaded holes. In the example outlined, it is provided that the connection of the additional body ZK to the abutment AB via separate connecting elements VE takes place, which can be fastened with one end in the receptacles VA and at the other end an additional body ZK can be attached. The attachment of the additional body ZK is preferably carried out by attaching the additional body to the connecting element VE in a designated SR direction of insertion. For this purpose, the additional bodies ZK have openings KA which can be inserted via the ends of the connecting elements VE facing away from the abutment. In Fig. 1 is shown for an additional body ZK left of the abutment a representation before the joining of connecting element VE and additional body ZK with the abutment. On the right side of the abutment AB, an additional body ZK is shown in a connected position.

The additional body ZK can advantageously even on the side facing away from the abutment further recordings for attachment of another additional body, so that by juxtaposing two or more additional bodies larger gaps are bridged or in particular on the distal side of an abutment in a toothless end of a mandibular auxiliary body can be arranged in advantageous for the acquisition of scan data position. The further recordings may be identical to the openings KA. In another embodiment, the openings may also be formed as through the additional body through holes and connecting elements of greater length may be provided on soft behind each other two or more additional body can be plugged. For larger gaps, it is also possible, in yet another embodiment, to provide larger auxiliary bodies which, as one-piece bodies, have the approximate dimensions and shapes of mutually adjacent teeth.

The images VA on the abutment are advantageously arranged so that they do not interfere with the scan structures of the abutment and their recognizability during scanning or as little as possible. The additional body ZK are as shown by the additional body on the right side of the abutment advantageously from the abutment laterally arranged in the example sketched so in the insertion direction of the connecting elements VE to scan or not as little as possible during scans with different fields of view of the scanning the scanning structures of the abutment AB cover. For their part, the additional bodies ZK have characteristic auxiliary structures KK in the form of edges, corners or the like which are advantageous during the scanning process and are advantageous for merging scan data from a plurality of scanning operations. In the example of an example sketched, the additional bodies are designed as schematic replicas of tooth forms.

On the abutment AB, receptacles VA are advantageously provided on opposite sides for connection to an additional body, so that uniform abutments can be used for the arrangement of an additional body ZK on any of the two sides or also on both sides.

Fig. 2 shows a first abutment arrangement prepared for intraoral scanning. A first abutment A1 1 is attached to an implant 11 anchored in the jaw Kl of a patient. A second abutment A2 is attached to a second implant 12 in a corresponding manner. The two implants 11, 12 are spaced apart in the direction RK of the mandibular arch of the jaw Kl, as is typical for tooth gaps according to several, in the example of three missing adjacent teeth. At the first abutment A1 1, on the side pointing in the direction of the second abutment A2, an additional body Z1 1 is arranged via a connecting element VE of the type of FIG. 1 and projects into the gap between the two abutments A1 1 and A12. Scannable auxiliary structures of the additional body protrude in the direction RK beyond the abutment A1 1 intended typical replacement tooth shape ZF, which is indicated by a broken line out. The scannable auxiliary structures of the Set body Z1 1 extend in the direction of RK from the central longitudinal axis LA of the abutment A1 1 by more than 1, 5 times the diameter of the abutment in the direction RK. Advantageously, the extension extends with the scannable auxiliary structures in the direction RK by at least 6 mm away from the occlusal longitudinal axis LA, in particular in the case of extensions and / or abutments in the region of the molars or premolars.

FIG. 3 schematically shows the scanning of the constellation shown in FIG. 2 with a scanning device SE, which can be positioned in successive scans at different locations over the gap to be supplied with a prosthesis in the dentition of a patient and in such different scans the constellation of the abutments A1 1, A12 with the additional body Z1 1 with the individual scans associated a priori not predefined and resulting from the respective situation Blickfel- the B1, B2 and B3 detected. In FIG. 3, the three different fields of view B1, B2, B3 are shown offset from one another in the direction RK. Typically, different fields of view are also different from one another by other positions perpendicular to the plane of the drawing of FIG. 3 and by different angular orientations in space. Scanning can be done by scanning point by line or line by line, or by a single image capture. The scanning methods are known per se in various designs and in use and therefore not discussed further here.

In each of the scans represented by the fields of view B1, B2, B3 scanned data are obtained in which the scanning structures of the abutments and the auxiliary structures of the additional body Z1 1 and other structural data from the surrounding teeth depending on the respective fields of view are included in different ways. For a complete overall image representation of the constellation according to FIG. 2, the scan data of all scanning Operations together, which is commonly referred to as matching the records.

FIG. 4 shows a further example of a constellation with two implants 11 and IW anchored in a jaw K 1, wherein the implant IW is inserted inclined in a manner known per se at an angle to the direction RK. Via the shape of the implant IW or via adapter, an upright position of the abutment A22 can be maintained even with such an oblique orientation of the implant IW. For the sake of simplicity, the same arrangement as in the case of the constellation according to FIG. 2 for the abutment A1 1 and the additional body Z1 1 is assumed for the abutment A21 and an additional body Z21 held thereon. On the abutment A22, a further additional body Z22 is arranged on the side facing the abutment A21 or the gap between the two abutments A21, A22. As a result of the two additional bodies Z21, Z22, a sufficient number of auxiliary structures for the scanning processes are provided within the larger gap between the two abutments A21, A22 in this constellation, in order to enable a reliable merging of the scan data of several scans into an overall image representation. Instead of the two in Fig. 4 attached to an abutment each additional body or in particular an implant in the molar region without distally following teeth can be provided as shown in Figure 5 an arrangement in which on a distal side of the abutment A5, a first additional body Z51 the abutment A5 is connected via a connecting element V51 and another additional body Z52 is held with a further connecting element V52 on the additional body Z51. Another with the abutment A5 via a connecting element V53 additional body Z53 is located on the opposite side of the abutment A5 and indicated attached to the next abutment auxiliary body Z54. In another embodiment, instead of the two additional body Z51, Z52 be provided a correspondingly larger single auxiliary body or the two additional body can also be plugged one behind the other onto a common longer connecting element, which then passes completely through the additional body Z51. In yet another embodiment, a gap between two adjacent implants can also be bridged by a continuous, in particular rod-shaped connecting element, which is assigned to the implants and on which one or more additional bodies are arranged. For this purpose, for example, the connecting element can be made variable in length, in particular telescopically with sections which can be pushed into one another, and / or be held on the abutments in a different way than the plug connection illustrated by way of example.

As shown in Fig. 5, and additional body can be arranged on both opposite sides of an abutment and held on this.

FIG. 6 schematically shows the process for obtaining an overall image representation of a constellation having at least one abutment and at least one additional body. To prepare the scans, the abutments and the additional bodies are fixed on the implants anchored in the jaw. Thereafter, a first scan is performed and the scan data obtained are stored in a buffer SP. The intermediate memory SP may be part of the scanning device or else a data processing device connected thereto. As long as further scans with other fields of view are required, a new scan is performed with a different field of view and the corresponding scan data is stored in each case. The individual scans and the associated scan data are distinguished in the scheme of FIG. 5 by the running number n from each other. If a sufficient number of scans are performed with different fields of view, no further scanning is initiated and the abutments with the additional bodies held therein are removed and the data sets SDn buffered in the memory SP for the individual scans are merged in a data processing using a program known per se in different versions.

The features indicated above and in the claims, as well as the features which can be seen in the figures, can be implemented advantageously both individually and in various combinations. The invention is not limited to the exemplary embodiments described, but can be modified in many ways within the scope of expert knowledge. In particular, other shapes than the schematically modeled tooth shapes can be used for the additional bodies ZK.

Claims

Claims:

1 . Arrangement for obtaining intraoral scan data from edentulous or partially edentulous pines with an abutment (AB, A1 1, A12, A21, A22) designed for attachment to a jaw implant (11, 12, IW), which

Scanning structures (FK, FL, ST, OF, OK), which characterize a unique position of the abutment in scan data obtained during a scan (SD) and allow the merging of scan data from different scans, characterized in that the abutment at least one extension (ZK, Z1, Z21, Z22), which extends in the direction of progression (RK) of the mandibular arch (Kl) away from the abutment and has scannable auxiliary structures.

2. Arrangement according to claim 1, characterized in that the extension is designed as an additional body (ZK, Z1 1, Z21, Z22).

3. Arrangement according to claim 2, characterized in that the additional body (Z1 1, Z21, Z22) in the direction (RK) of the mandibular arch (Kl) laterally offset from the abutment (A1 1, A21, A22) is arranged.

4. Arrangement according to claim 2 or 3, characterized in that the additional body (ZK) is formed as a schematic dental reproduction.

5. Arrangement according to claim 3, characterized in that projections on opposite sides of the abutment (AB) can be arranged.

6. Arrangement according to one of claims 1 to 5, characterized in that two along the mandibular arch (Kl) spaced from each other and at least one extension (Z1 1, Z21, Z22) between them enclosing abutments (A1 1, A12, A21, A22) are present.

7. Arrangement according to one of claims 1 to 6, characterized in that the extension (ZK) is detachably connected to the abutment (AB).

8. Arrangement according to one of claims 1 to 7, characterized in that the extension in a transverse to the longitudinal axis (LA) of the abutment (AB) extending plug-in direction (SR) is plugged into this.

9. Abutment for an arrangement according to one of claims 1 to 8, characterized by scannable structures and by connecting structures (VA), which are designed for connecting an extension (ZK) with the abutment (AB).

10. Abutment according to claim 9, characterized by at least one attachable to the connecting structures (VA) additional body with scannable auxiliary structures.

1 1. Method for obtaining intraoral scan data from edentulous or partially dentate pines by combining scan data from a plurality of intraoral scans, in which an abutment arrangement with at least one abutment attached to an implant (11, 12) is detected by a scanning device (SE) characterized in that at least one abutment with at least one extending away from this in the direction of the mandibular arch extension is used during the scans.