Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1996-08-09
1998-03-17
Wilson, John J.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433141, 433163, 433174, A61C 800
Patent
active
057279420
DESCRIPTION:
BRIEF SUMMARY
In dental implantology often cylindrical, rotationally symmetric bodies having a screw thread are used when employing artificial implants for anchoring fixed or removable dentures. The CH 684 384 A5 discloses an implant arrangement with an implant shaft being formed as a cylindrical, rotationally symmetric body of this kind for insertion into a jawbone. A threaded blind hole having a central axis coincident with the central axis of the implant shaft is provided at the end of the implant shaft away from the jawbone. A holding device having a central axis coincident with the central axis of the threaded blind bore may be screwed into the same. An artificial denture having a crown axis coincident with the central axis of the holding device and of the threaded blind bore can be mounted to the holding device.
The positioning of the implant, however, depends on the amount of bone available at the upper or lower jaw, resp. This often results in divergencies between the implant axis, the central axis of the implant shaft and the prosthetically required crown axis. In the above implant apparatus this axial divergence can be compensated by individual accessory units mounted on the straight implant shaft.
The accessory units increase the complexity of the implant as a whole and the costs.
It is therefore the object of the present invention to provide an implant arrangement which is suitable for securing a denture at a jawbone in a simple manner and at a low price even if the available amount of bone is insufficient.
This object is achieved by an implant arrangement for securing a denture at a jawbone having the features of claim 1.
The screwed-on insertion tool renders the angled implant arrangement rotationally symmetric and can be inserted without requiring additional space even in narrow tooth gaps.
Further developments of the implant arrangement are defined in the subclaims.
Further features and advantages of the invention will be apparent from the following description with reference to the FIGURE.
The FIGURE shows the implant arrangement according to an embodiment of the present invention.
The implant arrangement 1 according to one embodiment of the invention comprises an implant shaft 2, an insertion tool 3 and a bolt 4.
The implant shaft 2 forming the implant proper when inserted into the (not shown) jawbone has an external screw thread 5. The central axis 6 of the implant shaft 2 is coaxial with the external screw thread 5. A head having a projection 7 is formed at the end of the implant shaft 2 which faces away from the jawbone when the implant shaft is inserted. The projection 7 is shaped as an octagon nut or as an octagon screw head and projects from an upper face 8 of the head. A shoulder is formed by the projection 7 and the upper face 8. The axis perpendicular to the upper face 8 is inclined with respect to the central axis 6 of the implant shaft 2 by a predetermined angle, for example by 20.degree.. The central axis of the projection 7 is as well inclined with respect to the central axis 6 of the implant shaft 2 by the predetermined angle. A threaded blind bore 9 is formed in the projection 7. The central axis 10 of the threaded blind bore 9 is coaxial with the central axis of the projection 7.
The predetermined angle between the central axis 6 of the implant shaft 2 and the central axis 10 of the threaded blind bore 9 or the central axis of the projection 7, resp., corresponds to the suitable insertion angle of the implant into the jawbone so that the central axis 10 of the threaded blind bore 9 or the central axis of the projection 7, resp., coincides with the crown axis of the (not shown) denture to be secured, even if the available amount of bone is insufficient.
The insertion tool 3 of the implant arrangement 1 has a substantially cylindrical shaft 11. One end of the insertion tool 3 has a recess 12 with an octagon socket so that the recess 12 snugly fits onto the projection 7. The central axis of the recess 12 is inclined with respect to the central axis 13 of the cylindrical shaft of the insert
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Translation of the Abstract of CH 618,879.
Translation of the Abstract of CH679,117.
Translation of the Abstract of CH684,384.
Hartmann Alexander
Schilli Wilfried
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