Dentistry – Prosthodontics – Holding or positioning denture in mouth
Reexamination Certificate
1999-10-27
2001-03-20
Lucchesi, Nicholas D. (Department: 3732)
Dentistry
Prosthodontics
Holding or positioning denture in mouth
C433S221000
Reexamination Certificate
active
06203324
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a set of dental implants and an implant.
BACKGROUND OF THE INVENTION.
U.S. Pat. No. 5,199,873 discloses a dental implant consisting of a number of successive threaded sections of different diameter. Compared with a long continuous threaded section, such a construction has the advantage that the insertion distance covered by screwing can be appreciably shortened for equally good anchoring. As a result the load on the bone material can be limited and the insertion time can be shortened. In practice implants of this type with different dimensions are used. Drills must be used to produce the relevant openings in the jawbone. If the screw thread is conical, it is customary for a cylindrical drill to be used, a firm join to the jaw being obtained as a result of the conical nature of such a screw thread.
SUMMARY OF THE INVENTION
The aim of the present invention is as far as possible to restrict the number of drills that have to be used in a set of implants.
This aim is achieved with a set as described above in that a series of at least two implants of different diameter, each implant being stepped, with a smaller and a larger section is provided wherein the drill diameter for the smaller section of an implant corresponds to the drill diameter for the larger section of a subsequent smaller implant.
The system of dental implants described above is advantageously used with implants comprising a shaft section provided, close to the end to be provided with a superstructure, with an external engagement surface for an instrument, for screwing in the implant, and for receiving said superstructure, the external engagement surface being at least partially surrounded by a peripheral collar located some distance therefrom and extending from the shaft. By this means an external engagement surface for an instrument for screwing in the implant is obtained with which the stability of the superstructure subsequently to be fitted is improved. Such an instrument can be a (ring or box) spanner. In this context it is possible that the collar extends less far than the external engagement surface (always with reference to the free end of both components), extends equally as far as or extends further than the related engagement surface.
It is also possible by means of construction of both the collar and the external engagement surface to give the annular space that is delimited between them any shape, which makes possible, on the one hand, optimal engagement of the engagement surface by the related instrument and, on the other hand, optimal fixing of the superstructure. In the case of an advantageous embodiment of the invention, the internal surface of the collar is, to this end, made such that it diverges conically towards the free end thereof. By this means a centring, clamping effect of the superstructure is provided if the latter is provided with a corresponding or somewhat deviating cone. The engagement end can have any shape known from the prior art. It can be of cylindrical construction, for example, hexagonal or octagonal construction. It is also possible to construct the engagement end such that it conically tapers somewhat towards the free end. In this case as well, the shape can be hexagonal, octagonal or polygonal in some other way.
Surprisingly it has been found that much more stable fixing of the superstructure can be obtained with only a slight rise in the cost price for the production of the implant. Moreover, it is possible to provide the external surface of the collar with any desired shape. This surface can likewise be of conically divergent construction, but of cylindrical construction in other embodiments.
Using the construction described above it is possible to position the free end of the engagement surface considerably lower than in the prior art. As a result, the cover screw which is placed over the engagement surface after implantation is located much lower. Moreover, this means that the tilting moment exerted on the implant during chewing is much lower. The lower location offers many more prosthetic possibilities, especially in the case of a complex external superstructure.
If use is made of a collar which is of conically divergent construction, the angle of said cone with respect to the longitudinal axis of the implant is preferably in the range between 40 and 50° and more particularly is approximately 45°. By selecting said angle in this way, optimum adjustment of the superstructure or the secondary component is possible.
If the collar also extends conically on the outside, a smooth transition to the superstructure or the secondary component is possible.
That part of the implant that extends into the jaw can be provided with transverse openings and/or other means promoting adhesion with the jawbone.
It must be understood that the set of dental implants described above can also be used on dental implants other than those described above, that is to say implants with which the engagement surface for an instrument is internal or with which a collar such as that described above is not present.
According to a further aspect the series of implants as described above is used in dental implants comprising from the insertion end a tapering first thread section, an adjoining cylindrical section, a further tapering thread section of which the core diameter at least corresponds to the core diameter of the first thread and an adjoining free end section, wherein the implant internally comprises a threaded section having adjoining means preventing rotation of a later super structure as well as a conical end section, said conical end section being embodied to have a tool engaged thereto.
The invention relates both to single stage and to two-stage implants. Moreover, it is possible for some parts of the implant optionally to be provided with a screw thread.
REFERENCES:
patent: 5199873 (1993-04-01), Schulte et al.
patent: 5527182 (1996-06-01), Willoughby
patent: 5762499 (1998-06-01), Dard et al.
patent: 5788497 (1998-08-01), Chalifoux
patent: 90 02 823 (1990-06-01), None
patent: 0 819 410 (1998-01-01), None
patent: WO 98/52490 (1998-11-01), None
Lucchesi Nicholas D.
Young & Thompson
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