Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1997-09-16
1999-03-16
Lucchesi, Nicholas D.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
A61C 800
Patent
active
058822003
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement for connecting a dental implant and an associated conical secondary part, which can be used for impression taking, producing the master model or fastening a supra-appliance to the implant inserted in the jaw bone.
Constant development in material research, design, in instruments and implantation techniques have resulted in a continuous improvement in the success rate, so that ever more people with missing teeth or even tooth roots which are no longer present are deciding to have implants inserted. As a result, the people in question are able to improve their quality of life. Following bone healing phase of the implant or of a plurality of inserted implants in the jaw bone, the intra-oral geometry has to be transferred in a manner true to the original onto a master model by means of impression taking. The dental technician then uses the master model to produce the dental prosthesis or the artificial single tooth, which are ultimately placed on the existing implants as a supra-appliance in the mouth of the patient. To ensure that this supra-appliance functions without problems over a period of years, it is imperative that all the work, as well as the implants and further components of the system, be implemented highly precisely. This invention is concerned with improving the design of the connection arrangement between an implant and a secondary part which can be inserted into the latter. Depending on the prevailing circumstances, the use of a polygonal secondary part, for example known as octagonal secondary part, or of a conical secondary part may be suitable for the two-part implants in question, comprising the primary part, the actual implant and the secondary part. The conical secondary part in particular forms the subject-matter of the present invention.
FIG. 1 illustrates a conventional connection arrangement between an implant and a conical secondary part, as is described, for example, by Schroeder, Verlag Stuttgart, 2nd Edition, 1994, p. 199ff. To supplement the illustration, a new type of plug-in anchor and an associated impression cap are also provided, but these form the subject-matter of another patent application, although they can be used particularly advantageously in combination with the connection arrangement to which the present application relates.
The implant 1 is inserted intraosseously and transgingivally in the upper or lower jaw bone K, so that the implant head 11 penetrates through the mucous membrane S. After the bone healing phase of the implant 1, which lasts 3-4 months, the healing cap which was then no longer visible, was removed and the conical secondary part 8 was screwed into the implant 1 in situ. The base cone 81 of the conical secondary part 8 thus rests in the implant cone 12 and the threaded segment 82 of the conical secondary part 8 engages into the threaded bore 13 of the implant 1. The threaded bore 13 extends out of the chamber of the implant cone 12, axially downwards from the bottom face of the latter. The conical pillar 83 of the conical secondary part 8 protrudes beyond the implant shoulder 14. The transition between the base cone 81 and the conical pillar 83 is situated at the level of the inner edge 15 of the implant shoulder 14. In a manner corresponding to the implant cone 12, the base cone 81 narrows downwards, while the conical pillar 83 narrows upwards. An axial, blind-bore-like threaded bore 84, into which the threaded segment 110 of a plug-in anchor 100 is screwed, extends from the conical-pillar shoulder 85. For the purpose of impression-taking, an impression cap 300 is placed over the plug-in anchor 100 and the conical pillar 83, the mating shoulder 301, which is complementary to the implant shoulder 14, of the impression cap 300 resting completely and without gaps on the implant shoulder 14. The clamping head 130 of the plug-in anchor 100 forms a plug-in connection with the impression cap 300, so that the mating shoulder 301 is virtually pressed onto the implant shoulder 14. The implant shoulder 14 has
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Sutter Fran.cedilla.is J.
Sutter Franz
Institut Straumann AG
Lucchesi Nicholas D.
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