Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1991-10-30
1994-02-15
Wilson, John J.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433173, A61C 1312, A61C 13225, A61C 800
Patent
active
052861953
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a screw element for screwing together a multi-part dental prosthesis, with the screw element including a threaded sleeve, a locknut lying against the edge of the threaded sleeve and a cone screw whose threaded shaft is screwed into the threaded sleeve and whose head is supported in an interior cone of the locknut.
STATED OF THE ART
Screw elements composed of two or more individual components are employed to screw together multi-part dental prostheses, for example divided bridges and implant superstructures. Screw elements of this type are composed of a threaded sleeve, a locknut and a cone screw. The threaded sleeve as well as the threaded shaft of the cone screw are provided with a thread over their entire length The locknut has a cylindrical exterior surface and a conical interior surface, but no thread. The prior art screw elements have the following drawbacks: the dentist intending to screw together the components of the multi-part dental prosthesis, for example the bridge elements, in the mouth of his patient by means of the cone screw encounters the difficulty of reliably introducing the cone screw, which has a small diameter, into the threaded sleeve. In everyday practice it happens that the patient swallows the screw.
DESCRIPTION OF THE INVENTION
This is where the invention intends to come to the aid. It is the object of the invention to configure a screw element of this type so that the cone screw can be connected with the locknut and is held captive in it without interfering with the function of the screw element. According to the invention, this is accomplished in that the threaded sleeve, following its edge, and the cone screw, between its head and its threaded shaft, are each provided with a portion that is free of threads and, in the region in which its interior cone has the smallest diameter, the locknut is provided with an internal thread that is adapted to the threaded shaft of the cone screw.
In contrast to the prior art locknuts, the locknut of the invention is provided with an internal thread on its interior cone, in the region where it has the smallest diameter, into which the threaded shaft of the cone screw can be screwed. Only at the end opposite its head is the threaded shaft of the cone screw is provided with an external thread that can be screwed into the internal thread of the locknut. This external thread is screwed through the locknut. Once the external thread has passed through the locknut, the cone screw is held, on the one hand, displaceably but, on the other hand, captive in the locknut. When the locknut is placed onto the threaded sleeve, the external thread of the cone screw lies in the portion of the threaded sleeve which, as provided by the invention, is free of threads.
The invention accomplishes that the cone screw will not inadvertently fall out of the threaded sleeve. If several screw elements are employed, it is possible to simultaneously put on several locknuts.
BRIEF DESCRIPTION OF THE DRAWING
One embodiment of the invention is illustrated in th drawing and will be described in greater detail below. It is shown, in an enlarged illustration, in:
FIG. 1, an axial sectional view of a screw element in the non-mounted state;
FIG. 2, the screw element shown in FIG. 1 in the mounted state.
BEST MODE OF IMPLEMENTATION OF THE INVENTION
The screw element selected as the exemplary embodiment includes a threaded sleeve 1. A locknut 2 is in contact with one end face of threaded sleeve 1. Threaded sleeve 1 and locknut 2 are held in contact with one another by a cone screw 3 that is screwed into threaded sleeve 1 and is supported at locknut 2.
Threaded sleeve 1 is essentially configured as a hollow cylinder. At one end, it is closed by a bottom 11, at the opposite end, its edge 12, it is open. At a distance from bottom 11, threaded sleeve 1 is provided with an internal thread 13. The internal thread is guided only over part of the interior wall of threaded sleeve 1. A portion 14 without thread follows internal thread 13 up
REFERENCES:
patent: 4631031 (1986-12-01), Richter
patent: 4713003 (1987-12-01), Symington et al.
patent: 4832601 (1989-05-01), Linden
patent: 4842518 (1989-06-01), Linkow et al.
patent: 4854872 (1989-08-01), Detsch
patent: 4872839 (1989-10-01), Brajnovic
patent: 4932868 (1990-06-01), Linkow et al.
patent: 4938693 (1990-07-01), Bulakiev
patent: 5152687 (1992-10-01), Amino
patent: 5169308 (1992-12-01), Kvist
patent: 5213502 (1993-05-01), Daftary
Lucchesi Nicholas D.
Wilson John J.
ZL Microdent-Attachment GmbH
LandOfFree
Screw element for threadedly connecting a multi-part dental pros does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Screw element for threadedly connecting a multi-part dental pros, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Screw element for threadedly connecting a multi-part dental pros will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1203065