Dentistry – Prosthodontics – Stress breaker
Patent
1990-05-04
1991-07-23
Stone, Cary E.
Dentistry
Prosthodontics
Stress breaker
433173, A61C 1328
Patent
active
050339621
DESCRIPTION:
BRIEF SUMMARY
The present invention is concerned with a stump to be fixed to the endostal part of a dental implant, which is of the type described in the preamble of claim 1.
Dental implants of several types are known, such as for example implants with blades, implants with screws, etc. These implants are generally comprised of a so-called endostal part, which is designed to be implanted into the jawbone and a head part designed to protrude above the gum and to support a tooth or a prosthesis, with the two parts forming an integral body. These implants have the disadvantage of forming hard points with respect to the neighboring teeth, which, when they are healthy, have a resiliency of about 0.2 millimeters.
An implant capable of remedying partly the above drawbacks is described in French Patent 1'584'711. This implant is comprised of a body fixed on a rider resting on the maxillary, said body being provided with an inner threading for receiving the threaded end of a cylindrical piece covered with a cap integral with the prosthesis, said cap being capable of sliding axially and resiliently on the cylindrical piece, an elastic element being arranged at the interface cap/cylindrical piece at the upper end of said cylindrical piece. Such an implant functions well only when the force applied on the prosthesis acts primarily vertically, i.e. in the direction of the implant axis. In practice however, this ideal situation is rather exceptional and, generally, the horizontal component of the force exerted on the prosthesis is important. Accordingly, the implant described in the French Patent 1'584'711 does not make it possible to re-create the physiological conditions of a healthy tooth.
The purpose of the invention is to provide a stump to be fixed to the endostal part of a dental implant, which makes it possible to re-create the physiological conditions corresponding to those of a healthy tooth, in order to remedy the drawbacks of known implants.
Accordingly, the object of the invention is a stump designed to be fixed to the endostal part of a dental implant, comprising a central core having a head part and a lower part provided with means for fixing the stump to the implant, and a cap for covering at least a part of said head part, a first elastic element being arranged at the interface cap/central core at the upper end of the head part, a second elastic element being arranged at the interface cap/central core in a first groove provided along the periphery of the head part of the central core, the assembly being arranged so as to permit relative movement between the cap and the central core, laterally arranged restraining elements being provided to limit the relative vertical movement between the cap and the central core.
According to one embodiment of the invention, the first groove is provided along the periphery of the head part of the central core, at the level of the lower end of the cap, the cap being supported by said second elastic element.
According to one version of the invention, at least a third elastic element is arranged at the interface cap/central core, inside a second groove provided along the periphery of the head part of said central core, between the first groove and the upper end of the head part of the central core, the stump being capable of comprising at least a third groove provided along the periphery of the stump, the restraining means comprising a locking means, one end of which, having outer dimensions lesser than the width of said third groove, is engaged inside the third groove.
The third groove can be located between the first and the second groove.
The second elastic element can be arranged so as to provide a surface for supporting vertically the cap and a surface for supporting laterally said cap.
The lower end of the cap can comprise an inner ledge intended for supporting vertically the cap by the second elastic element and a peripherally protruding part which is positioned opposite an upper outer ledge of the lower part of the central core, and arranged to provide an abutment for the relati
REFERENCES:
patent: 2854746 (1958-10-01), Lester et al.
patent: 4746293 (1988-05-01), Lundgren
patent: 4756689 (1988-07-01), Lundgren
patent: 4938693 (1990-07-01), Bulakiev
LandOfFree
Stump to be fixed to the endostal part of a dental implant does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stump to be fixed to the endostal part of a dental implant, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stump to be fixed to the endostal part of a dental implant will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-429835