Dentistry – Apparatus – Hand manipulatable implement
Patent
1989-10-20
1991-02-26
Stone, Cary E.
Dentistry
Apparatus
Hand manipulatable implement
433174, A61C 300
Patent
active
049958100
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention is related to a tool for screwing into place a threaded prosthetic part (6), such as a part of a dental implant. The object of the invention is to provide a tool by which a prosthetic part having no grip means may be gripped, screwed into place and released from the tool in a simple manner.
STATE OF THE ART
From Adell et al., Int. J. Oral Surg. 10 (1981) page 388 a dental implant system is known comprising a root screw or fixture (a), a distance screw (d) and a gold cylinder (k). The root screw is intended to be screwed into a hole taken up in the jaw bone of a patient, and the distance screw is intended to be screwed into a hole in the root screw. For screwing into place, the root screw and the distance screw are both provided, at the upper ends thereof, with projecting hexagonal wrench abutments which may be gripped with a wrench having a corresponding recess. The making of such wrench abutments is a cost-raising fine-mechanical work operation in manufacture of said parts. The wrench abutments further have to be covered by the vaulted head of a screw or a plastic cap in order not to irritate the tissues of the oral cavity.
From WO No. 85/02337 an implant system is known comprising a root screw 1 and a pillar 6, neither of which having special grip means. For quick and easy attachment of said parts there is, however, a need for a tool.
DESCRIPTION OF THE INVENTION
According to the present invention there is provided a tool of the kind referred to initially above, which fulfils the object presented above. The tool comprises a turning bolt which has an elongated cylindrical core having at one end thereof a head for turning the tool, and having at its opposite end a portion with first threads for fitting into threads in the prosthetic part. The tool is characterized in that the core has second threads on a portion thereof between the ends thereof, said second threads having a pitch direction opposite to the pitch direction of the first threads, and a sleeve arranged around the core, said sleeve having threads engaging said second threads, whereby the sleeve may be screwed into contact with the prosthetic part and to lock the tool in the prosthetic part.
The tool is primarily intended for screwing into place a part of a dental implant, such as root screw which is screwed into a hole taken up in the jaw bone, or another part, which in turn is to be attached to the root screw, e.g. a distance element. The first threads should have the same pitch direction as the threads by which the prosthetic part is screwed into its place of attachment. For all practical purposes, all these threads are normal right-handed threads, which means that the second threads arranged on the tool are left handed threads.
According to a preferred embodiment of the invention, the tool is characterized in that the second threads are arranged on a portion of the core having a greater diameter than the threaded end, and that the sleeve arranged around the core has a main portion in which the threads are arranged, and an end portion having a reduced diameter adjacent to the threaded end portion of the core.
The end of the sleeve adjacent to the threaded end of the core has a contact surface shaped for fitting against the prosthetic part to be screwed into place. The contact surface of the socket may thus be e.g. planar, inwardly conical or outwardly conical.
The invention will be further described with reference to the appended drawings, wherein:
FIG. 1 is an exploded view showing a tool according to the invention together with prosthetic parts and a connector,
FIG. 2 is a side view of a turning bolt for the tool in FIG. 1,
FIG. 3 shows a sleeve, partly in section, for the tool in FIG. 1, and
FIG. 4 shows a tool according to the invention at an oblique view from above.
In the drawings 1 denotes a turning bolt having an elongated cylindrical core 2 with a head 3 at one end thereof. The opposite end of the core has a cylindrical portion 4 having at the outer end thereof outward right-handed threads
REFERENCES:
patent: 4234309 (1980-11-01), Sellers
patent: 4553942 (1985-11-01), Sutter
Astra Meditec Aktiebolag
Stone Cary E.
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