Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1998-04-28
2000-05-30
Wilson, John J.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433173, A61C 800
Patent
active
06068478&
DESCRIPTION:
BRIEF SUMMARY
FIELD
The present invention relates to an impression system with an impression cap for an implant fitted in the human body in order to transfer the implant end protruding from the tissue structure, including possible superstructures on this implant end, to a master cast.
PRIOR ART
The following discussion refers in the first instance to the example of dental implants. For taking an impression of the situation in the patient's mouth and for transferring the impression obtained to a master cast, on which the tooth replacement is then modelled, a number of elements have hitherto been used. The work steps that have had to be performed to date, and the elements used in these work steps, are dealt with in detail by SCHROEDER, A.; SUTTER, F.; BUSER, D.; KREKELER, G.: Orale Implantologie [Oral implantology], Georg Thieme Verlag Stuttgart, 2nd edition, 1994, page 202 et seq. On the one hand, the assembling of the elements in the patient's mouth, particularly in the area of the molars, is problematic because of the resulting overall height of the elements, especially if a screwing instrument has to be used as well. Moreover, the work procedures are demanding for the patient, and they are time-consuming as regards impression-taking and production of the master cast. In addition to this, inaccuracies occur. The difficulties result primarily from the fact that the impression cap does not hold itself on the implant fitted in the mouth or on the manipulation implant to be used subsequently in the production of the master cast. DE 44 15 670 A1 discloses an impression cap which, at the open end facing the implant, has resilient flaps which, when applied, engage over the shoulder of the conical superstructure, the latter being fitted into the implant. The impression cap described there cannot therefore be used for taking an impression of the implant end protruding from the gingiva and projecting into the mouth, but instead only for taking an impression of the outer contour of the superstructure while the implant is positioned below the gingiva.
OBJECT OF THE INVENTION
In view of the hitherto costly and in some cases inaccurate impression-taking and production of the master cast, and in view of the fact that the impression caps can only be used conditionally, the invention is based on the problem of creating an impression system with an impression cap which is suitable for transferring, to a master cast, an implant end, on which a superstructure can be located, protruding from the human tissue structure. Here, the impression cap, embedded in the impression compound present in the impression tray, must be able to be removed from the fitted implant, and it must be able to receive the manipulation implant equally securely. It must be possible for the impression cap to be used for the most varied types of implants, even when very different abutments are fitted therein, for example abutments which are straight or angled, conical or with a polygonal head, solid or with an internal thread.
SUMMARY
The impression system comprises as its principal component an impression cap for transferring an end, protruding from a human tissue structure, of an implant which is fitted in the human body, including possible superstructures, to a master cast. The outwardly directed implant end has an undercut contour on its outside, and the impression cap has a geometry which complements the undercut contour and engages therein. The undercut contour is formed either by an implant geometry tapering in a trumpet shape towards the implant bed, or by a recess near the implant end.
The engaging geometry provided on the impression cap is advantageously a snap element in the form of a circular lip, or it is formed by individual gripping members. In a preferred embodiment, the implant end is trumpet-shaped, and it has an angled shoulder portion in the form of an implant shoulder in the area of greatest diameter. The cap shoulder provided on the impression cap is supported at least partially on the implant shoulder.
On the outer circumference, the im
REFERENCES:
Orale Implantologie, 2 ed., Georg Thieme Verlag, Stuttgart, New York, 1994, pp. 202-209.
Oral Implantology, 2d rev. ed., Georg Thieme, Verlag, Stuttgart, New York, 1996, pp. 198-204.
Baumgartner Reto
Grande Vincenzo
Tschirky Roger
Institut Straumann AG
Wilson John J.
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