DE1062885B - Fixing device for anchoring dentures - Google Patents

Description

There is an increasing need for periodic wearers of dentures Cleaning of the inevitable joint between the oral mucosa and the denture base. If the Anchoring the dentures can only be solved by the dentist, so this need can not be in be satisfied to a sufficient degree. The invention now aims to provide an anchorage that can be detached from the dental prosthesis at any time and reattached after cleaning, the parts of which, despite their small size, are able to cope with the forces occurring during the chewing process and when the often repeated removal and replacement of the denture does not wear out noticeably.

It is already a fastening device for anchoring dentures on an approach one With a root post provided tooth root cap became known, in which the root post with The root cap is cemented into the root canal in the usual way. The approach contributes to his upper end of a small ball that is inserted through a hole in a sleeve in the denture can be and then snaps between the individual turns of a spring lying in the sleeve. This ball joint-like connection has the disadvantage that as that they move forward, d. H. in the sagittal direction.

The object of the invention is to create a detachable connection between the tooth replacement and the tooth root that is still present, but which is secured against displacement. This is achieved according to the invention in that the approach of the thus cemented pin has at least one essentially vertical cylindrical guide surface and an annular recess adjoining this guide surface, that a spring ring is inserted in the annular recess and that the interior of the removable denture has at least one with dei the first-mentioned guide surface of the pin cooperating guide surface and adjoining it has an annular recess into which the dei; Spring washer when putting on and pulling off the tooth ² replacement can evade.

The drawing represents an embodiment of the subject matter of the invention.

The drawing shows this embodiment in longitudinal section.

In the drawing, 1 denotes a natural tooth root, in the root canal of which a root post 2 with a root cap 2 α is anchored in the usual way. An artificial tooth crown or other dental prosthesis is designated with 3, in which a sleeve 4, which has a knurled outer surface 5, is anchored.

Fastening device
for anchoring dentures

Applicant:
Dr. Albert Gerber, Zurich (Switzerland)

Representative:

Dr.-Ing. K. Boehmert and Dipl.-Ing. A. Boehmert,
Patent Attorneys, Bremen 1, Feldstr. 24

Claimed priority:
Switzerland from March 9, 1956

Dr. Albert Gerber, Zurich (Switzerland),
has been named as the inventor

In this sleeve 4, a bush 6 is firmly screwed, which with a convex conical surface 6 a rests snugly on a mating surface 4 a of the sleeve. These and the sleeve 6 forming the functional point along a uniform cap-shaped member that internally, with two coaxial cylindrical guide surfaces, one of which connects the one 4i>, c to the bottom 4 of the sleeve and is narrower than the other, 6 b , which adjoins the edge of the part, has an annular recess 7, which is located next to the end of the other guide surface 6b facing the bottom 4c of the sleeve. In this circular recess 7 a radial slotted, flat spring ring 8 with a circular cross-sectional area 8 a is used with ample radial play and tight axial play, the inner diameter of which is smaller than the diameter of the other guide surface 6 b. The two-part structure of the sleeve-shaped part 4, 6 makes it easier to insert the spring ring 8, and this two-part structure can therefore be dispensed with if one does not remove the spring ring from the annular recess 7 again. With 6 c a slot made with a side milling cutter for attaching a tool for screwing in and unscrewing the socket 6 is referred to.

One of the components that are firmly screwed together, namely the attachment 9 and the part 10,

B 580/18

straight bolt, which could easily be made of one piece, has a base 9 a, which is non-detachably attached to the root cap 2 a by soldering or is soldered to this root cap. It also has a cylindrical lower part 9b, which closes off at the base 9a and fits into the other or further guide surface 6i, an annular recess located opposite the circular recess 7 when the denture is in place. under Bfl'durig a, e _{T o} rsterj kegeliörmigen shoulder 10 b subsequent Wülst.lö.c, "% s Dej diameter is equal to derjeaigf ^ 'of the ynterteiles 9 b and at its from the shark _1;" a |) g8W £ nde.ten side, a second conical shoulder 10 forms d and a ir the narrower guiding surface 4 b matching head portion IQE.

The wall 7 α of the circular ring-shaped recess, remote from the bottom 4 c of the sleeve, forms a flat ring shoulder on which, when the denture is placed, the spring finger 8, which is still tensioned and leans against the first conical shoulder iO ^ r, exerts an axial pressure to press the sleeve-shaped part,. exerts the base 9a of the bolt. The planar annular shoulder consisting of the annular chamber wall Ta is, like the guide surface 6 b and the planar outer end surface 6 d, which rests on a flat support surface 9c of the base 9a, a part of the bushing.

When the dental prosthesis is removed, the conical shoulder 10 & the spring ring 8 resting on the flat shoulder 7a expands, while when the dental prosthesis is replaced, this spring ring, which is inserted with little axial play in the circular recess 7, is temporarily expanded by the conical shoulder 10d of the bead 10c, until the neck 10 a is again opposite the circular recess and the spring ring acts again on the conical shoulder 10 b because it cannot close completely.

The fact that the head part 10i has a smaller diameter than the lower part 9b, which merges into the base 9a with a rounded portion 9d , offers two important advantages. On the one hand, the sleeve 4 can be tapered outwards towards the bottom 4c, so that the dental prosthesis 3 is weakened as little as possible. Nevertheless, the lower part 9 b of the bolt has a relatively large diameter; Secondly, the blind placement is particularly important in the first phase because of the abundant radial play between the socket 6 and the head part 1Oi? relieved.

That the spring ring 8 is free in the annular recess 7 when the dental prosthesis is removed can rotate, has the advantage that the bead 10c does not do the repeated putting on and taking off always at certain points of its circumference by the same parts of the spring ring, so not unevenly is worn out.

Claims (5)

Patent claims: 1. Fastening device for detachably anchoring of dental prostheses to one approach, a nit a root pin provided Zahnwurzelcappe, wherein the retention pin with Wurzelcappe in a conventional manner in the tooth root canal cemented fst, ^r characterized in that the projection (9) of the thus cemented pin (2) miniestens has a substantially vertical cylindrical guide surface and an annular recess (10a) adjoining this guide surface, that in the annular recess (10a) ^ a spring ring (8) is inserted and daj_der interior of the removable denture (3) at least one with the the first-mentioned guide surface, the pin (2) cooperating guide surface (6 b) and then an annular recess (7) into which the spring ring (8) can move when the dentures (3) are put on and taken off. 2. Fastening device according to claim 1, characterized in that a cap (4, 6) is inserted into the interior of the removable tooth replacement (3) which contains the cylindrical guide surface (6b) and then the annular recess. 3. Fastening device according to one of the preceding claims, characterized in that the cap consists of an inserted sleeve (4) and a bushing (6) screwed into it, which then forms an approximately horizontal shoulder (7a) on the concentric guide surface (6b), on which the spring ring (8) rests when the dental prosthesis (3) is in place, while the annular recess is worked into the sleeve (4). 4. Fastening device according to one of the preceding claims, characterized in that above the annular chamber (7 a, 7, 10 a, 10 b) there is another guide surface (4 b) which is coaxial to the first cylindrical guide surface and in which the upper end (10 e) the bolt (10) is guided. 5. Fastening device according to claim 4, characterized in that the diameter of the second cylindrical guide surface (4 6) is smaller than the diameter of the first guide surface (6b) and that the bead part (10 c) adjoining the annular recess (10 a) merges over a conical shoulder (10d ") into the head part (10c) that fits into the second guide surface (4 &). Considered publications:
U.S. Patent Nos. 2,635,338, 2,691,219. 1 sheet of drawings © 909 580/18 7.59