Dentistry – Prosthodontics – Holding or positioning denture in mouth
Reexamination Certificate
1999-09-13
2001-08-28
Manahan, Todd E. (Department: 3732)
Dentistry
Prosthodontics
Holding or positioning denture in mouth
C433S201100
Reexamination Certificate
active
06280193
ABSTRACT:
The present disclosure relates to dental implants, more particularly those with a central opening needed for setting up a threaded abutment or a parodontal ring.
These implants have to be installed in the human skeleton, preferably the dental skeleton and eventually the animal skeleton. In opposition to techniques using posts located in the natural root of the tooth, dental implants are set up after the extraction of the whole tooth. The osseous tissue after its rebuilding is then drilled for the fitting of the implant.
The majority of the implants valuable for osseous tissues is made of titanium as pure as possible. Titanium T 40, T50, T60 are mostly used. These titanium implants are generally tightly fitted in the bone drill hole, they can be coated with hydroxyapatite or porous titanium. An other possibility for these titanium implants is to be screwed in the bone, which gives a better security in the quality of the fixing.
Since a few years, new implants are under experimentation. Some of them have been adopted successfully like those made of zirconium oxide with a particularly good robustness linked to the hardness of the zirconium oxide material and consequently a longer life.
Zirconium oxide implants available today may have sometimes a central axial conical hole, the shape of which is polygonal, more often square or hexagonal. Their hole is obtained by moulding and then sintering and they can receive prosthetics with a similar shape which have to be adjusted in the well before fixing with a dental cement.
However, even with these techniques, the longevity of these zirconium oxide implants is not optimal. A possibility to improve the quality of these implants would be to give them a threaded central axial hole which would allow to fix an abutment within the implant with an appropriate screw.
In fact, due to the extreme hardness of the material, it is not possible to drill correctly this threaded hole once the implant has been molded.
The present invention gives in fact the solution to manufacture zirconium oxide based implants with a threaded central axial hole. This hole, following the invention, is made, during the molding of the implant with a wired insert which will reproduce within the implant the adequate tapping. This threaded insert is movable and can be put or changed on its support which is a mobile part of the mould. Threading is obtained by molding. One makes a sintering by injection in the mould under high pressure of a zirconium oxide paste which is then baked at high temperature. The threaded hole is used for reception of various prosthetics which are either directly screwed in the implant or eventually fixed with appropriate screws. These screws may become antirotational by application of a dental resinos cement.
Several solutions allowing the realization of the central threaded hole in the body of the implant will be proposed.
Threading is however always made during the molding of the implant by injection under high pressure of the zirconium oxide based material.
On the other hand, the implant itself is most frequently screwable. This means the present invention leads to the manufacture of a dental implant presenting a longer life then the presently existing implants.
One therefore speaks, following the invention, of a tap implant. This threading allows the set up of an adequate screw to fix the abutment over the implant.
The purpose of the invention is a zirconium oxide based dental implant with an external thread and characterized by a molded internal thread The invention proposes too the manufacturing process of such an implant.
REFERENCES:
patent: 3589011 (1971-06-01), Sneer
patent: 4259072 (1981-03-01), Hirabayashi et al.
patent: 4668191 (1987-05-01), Plischka
patent: 4983182 (1991-01-01), Kijima et al.
patent: 5192325 (1993-03-01), Kijima et al.
patent: 5397362 (1995-03-01), Noda
patent: 5824089 (1998-10-01), Rieger
patent: 474571 (1994-07-01), None
patent: 08038512 (1994-07-01), None
Gourlaouen-Preissler Jeanine
Larson & Taylor PLC
Manahan Todd #E.
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