The patent's assignee is Heraeus Dental Ab.
News editors obtained the following quote from the background information supplied by the inventors: "When securing a dental prosthesis to the jaw of a patient, it is commonly known to attach a superstructure to osseointegrated dental implants. However, since the position and angle of the dental implants vary greatly from patient to patient, the use of angled distances is common. These distances are placed upon the dental implant, and the superstructure is then most often cemented to the distances, since it is difficult to screw retain the superstructure to such distances. However, when using separate distances, these will inevitably extend--at least to some extent--in the axial direction of the dental implant. It is then often very difficult or even impossible to apply the superstructure on such distances, since the application of the superstructure calls for a substantially parallel arrangement of the distances. Also, the mounting process when using such distances is very complicated and cumbersome, since a vast number of different distances must be tested on the implants, to find the needed match. Also, interfaces between the distances and the superstructure are hygienically bad.
"In order to model the desired position of the screw channel mouth in screw retained superstructures, it is known to position acrylic tubes on a model of the jaw of a subject. The model shows the position of the osseointegrated dental implants, and the acrylic tubes are placed at these positions and bent to the desired curvature before a mould is formed, based on the bent acrylic tubes. Subsequently, separate seat support cylinders are planarized together with the casted superstructure, whereafter the separate screw member seat support cylinders are welded onto the casted superstructure.
"However, it may be hard to bend the acrylic tubes correctly. Bending the tubes to the desired curvature is tedious and the tubes may flex after bending, which may result in a mould with erroneous angles. Furthermore, it is only possible to obtain bent screw channels, following a curvature, whereby the angle between the central axis of the mouth of the attached screw seat and the central axis of the screw channel mouth is limited to angles less than 17 degrees. Also, the manufacturing procedure is quite cumbersome, including several separate manufacturing steps, such as casting, planarization, fitting, welding etc.
"Thus, there is a need for a new method and device, allowing for improved construction of angled distances."
As a supplement to the background information on this patent application, NewsRx correspondents also obtained the inventor's summary information for this patent application: "Accordingly, the present invention preferably seeks to mitigate, alleviate or eliminate one or more of the above-identified deficiencies in the art and disadvantages singly or in any combination and solves at least the above mentioned problems by providing a method for manufacturing a dental superstructure or part thereof, comprising the steps of (i) making a dental imprint from the mouth of a subject; (ii) mounting an analog in the imprint to obtain a working model; (iii) attaching a screw channel directing device, comprising a screw channel part and an implant cooperating part, said screw channel part being tiltable in relation to the implant cooperating part, to the working model; (iv) tilting the screw channel part in relation to the implant cooperating part into a desired angle; (v) shaping a mold creating a master superstructure or part thereof onto the screw channel directing device; (vi) forming a mold based on the master superstructure or part thereof; and (vii) casting or CAD/CAM shaping of the dental superstructure or part thereof;
"a screw channel directing device, comprising a screw channel part and an implant cooperating part, said screw channel part comprising a screw channel mouth in the distal end, and a screw member seat with a screw hole in the proximal end, wherein the proximal end of the screw channel part is bowl shaped, such that the inner bottom surface has a concave shape and its outer bottom surface has a convex shape, and wherein the screw hole of the screw member seat is a long hole, and wherein said implant cooperating part is collar-shaped with an implant seat at its proximal end, and a distal concave screw channel part seat, wherein the screw channel part seat has a radius corresponding to the radius of the outer bottom surface of the screw channel part to form a ball joint, such that the central axis of the screw channel part may be tilted/angled in relation to a central axis of the implant cooperating part; and
"a screw channel directing device, comprising a screw channel part and an implant cooperating part, said screw channel part comprising a screw channel mouth in the distal end, and a screw member with a distal gripping portion in the proximal end, said screw member being arranged in a screw member seat at the bottom proximal end of the screw channel, wherein said screw member has a screw member head in the proximal end, said screw member head having a head configuration in form of a peripheral contour, adapted for cooperation with the implant cooperating part, wherein said screw member part comprises a concave interaction surface for cooperation with a convex interaction surface on the implant cooperating part to form a ball joint, said screw member head having a slanting distal contact surface for cooperation with a contact surface on the implant cooperating part when the central axis of the screw channel part is angled in relation to the central axis of the implant cooperating part.
BRIEF DESCRIPTION OF THE DRAWINGS
"These and other aspects, features and advantages of which the invention is capable of will be apparent and elucidated from the following description of embodiments of the present invention, reference being made to the accompanying drawings, in which
"FIG. 1 is a schematic cross-section of a tiltable screw channel directing device according to an embodiment; and
"FIG. 2 is a schematic cross-section of a tiltable screw channel directing device according to another embodiment
"FIG. 3 is a flowchart showing the steps of a method according to an embodiment; and
"FIG. 4 is a flowchart showing the steps of a method according to another embodiment"
For additional information on this patent application, see: Benzon, Sture. Superstructure and Methods for Manufacturing the Same. Filed
Keywords for this news article include: Dentistry, Heraeus Dental Ab.
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