DE7534861U - Dental implant made of A1203 ceramic for attaching a superstructure - Google Patents

Description

Applicant: Friedrichsfeld GmbH, Steinzeug- und Kunststoffwerke, 68 Mannheim-Friedrichsfeld , St e inzeugstraße 50

Dental implant made of A12Q3 ceramic for attachment a superstructure.

The invention relates to a dental implant made of Al2O3 ceramic for fastening a superstructure / wherein the distal end has an anchoring associated with the superstructure, wherein

cylindrical

the / shaft has constrictions which are to the axis of the dental implant form approximately vertical surfaces, and wherein the proximal end is rounded.

Such a dental implant is known from Samuel Sandhaus "New Aspects of Implantology", Medica-Verlag; Reference is made in particular to pages 156 to 163. This known dental implant made of A12O3 ceramic is screwed into the jawbone, all of its parts being shaped accordingly to this screwing in. The distal end carries a hexagon to enable zn with a wrench to screw. The surfaces that are approximately perpendicular to the axis of the dental implant form screw surfaces that are oriented towards the distal end. The proximal end is conical in order to displace the bone when it is screwed in, and has a gap into which the bone mass grows and is intended to prevent subsequent twisting.

This known dental implant takes these requirements into account of screwing in, but not those requirements which must be fulfilled so that bone formation and bone maintenance in the area of the implant is optimally promoted. Of the The invention is based on the object of eliminating this disadvantage of the known dental implant and solving it Task by combining the following features:

7534861 06/23/77

1. The anchorage is designed as a threaded bushing;

2. The surfaces are ring surfaces that are exactly perpendicular to the axis and are oriented towards the proximal end;

3. the rounded proximal end is a spherical cap with | smooth, uninterrupted surface.

To get the bone as possible and to stimulate the area of the implant g tates for bone formation, the chewing pressure in the same must

Direction to the bone, as is the case with natural teeth. These natural teeth are in oriented essentially perpendicular to the jawbone. Because the jawbone is in the tooth-bearing area, slightly curved

the teeth in the back of the jaw are not facing in the same direction as in the front of the jaw. The dental implants must also be oriented; in the known dental implants that is not possible, because the superstructure is attached to the formed as a hexagon fixtures, all of which exactly parallel for this reason \

need to be oriented. In the construction according to the invention], however, the anchorage at the distal end is designed as a threaded socket {L, so that it is possible for the dental technician to drill holes in the superstructure in such a way that a screw connection with the dental implant at any angle is possible through these holes.

As an essential prerequisite for solving the task is through the threaded bushing at the distal end of the dental implant first of all provided for a correct orientation. Furthermore, according to the second feature, are those of the constrictions formed surfaces are not oriented towards the distal end, but towards the proximal end. This causes them to chew the pressure transferred to the tissue that is growing into the constrictions and stimulate bone formation. In contrast, the

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known dental implants these surfaces formed by the constrictions to be oriented towards the distal end in order to be Screw surfaces to drive the dental implant into the bone.

In order to prevent the known dental implant from twisting, it has a gap at the bottom in which bone mass grows into it. However, this growing in prevents the formation of collagen fibers oriented tangentially to the surface, which - when viewed three-dimensionally - a hammock-like one Form structure and support the implant resiliently. According to the invention, the proximal end is provided as a spherical cap smooth, uninterrupted surface; this favors the formation of the collagen fibers, which on a bony bulge are suspended, its formation by the adjacent to the proximal end, oriented to this and exactly perpendicular to the axis Ring surface is stimulated.

The one caused by the smooth spherical cap according to the invention The formation of collagen fibers arranged in the shape of a hammock is on the one hand due to the fibers perpendicular to the jawbone Arrangement (made possible by the threaded bushing according to the invention) of the dental implant and, on the other hand, by the formation a ring bead stimulating, to the proximal end oriented ring surface of the constriction allows. In their combination thus all features according to the invention work together for the common purpose according to the invention.

As a particular advantage of the dental implant according to the invention its one-piece design should also be emphasized.

Advantageous embodiments of the dental implant according to the invention are specified in the subclaims. An exemplary embodiment is explained with reference to the drawing.

The single figure shows a view, partly in section, of the cylindrical one-piece dental implant according to the invention.

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The distal end 2 has one made of gold and / or platinum Threaded bushing 4 as anchoring for a superstructure. The cylindrical shaft 6 has two annular constrictions 8 and 10, which are delimited towards the distal end 2 by annular surfaces 12 and 14. These annular surfaces 12 and 14 extend are perpendicular to the axis 16 of the dental implant and are oriented towards the proximal end 18.

The second constriction adjacent to the proximal end is followed by the spherical cap 20, which forms a hemisphere Surface 22 is completely smooth and has no gaps or unevenness into which bone substance could grow, having.

The cylindrical part of the shaft 6 has a radius R. Directly above the annular surface 14 is a likewise cylindrical one Section 24 with the same radius R is provided. The transition from the upper constriction 8 to the cylindrical section 24 forms a conical surface 26, the conical surfaces of which enclose an angle of 15 with the axis 16; this results a cone opening angle of 30.

The diameter of the spherical cap 20 is also equal to the diameter 2R of the cylindrical sections 6 and 24. The transition surfaces from the second constriction 10 to the spherical cap 20 is likewise through an end 18 extending to the proximal end Conical surface 28 is formed, the opening angle in turn 30 °.

The dental implant according to the invention can be made more dense Al2O3 ceramics can be produced very easily on the lathe, as all of its parts are rotationally symmetrical and not at all Has millings. The socket, made of gold or platinum, can be glued on top.

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The dental implant is inserted into the jawbone an artificial alveolus is drilled approximately perpendicular to the surface of the jawbone, according to the ideal natural one Orientation of the teeth at the respective point. This orientation can be chosen regardless of the construction of the superstructure.

Bone-forming tissue grows into the constrictions 8 and 10, and in the area of the spherical surface 22 of the spherical cap 20 the bone is transformed into soft connective tissue in a thin layer. During the chewing movements in the direction of the axis 16 a Chewing pressure exerted. Due to the flexibility of the connective tissue in the area of the spherical surface 22, the chewing pressure also presses on the in the Constrictions 8 and 10 ingrown new tissue and stimulates this to ossify. It forms in the area of the lower Constriction 10 is a ring-bone bead on which collagen fibers grow, which lie against the spherical surface 22 and the spherical cap

; 20 spring-loaded.
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The dental implant according to the invention is therefore easy to manufacture and stimulates the surrounding tissue to form collagen fibers and new bone formation, thereby ensuring safe ingrowth of the Dental implant in the jawbone is guaranteed and through the chewing pressure acting on the bone prevents regression of the bone tissue.

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Claims (4)

Expectations 1. Dental implant made of Ai203 ceramic for attaching a Superstructure, the distal end having an anchoring associated with the superstructure, the cylindrical Shank has constrictions which are to the axis of the dental implant form approximately vertical surfaces, and wherein the proximal end is rounded, characterized in that the anchorage is designed as a threaded bushing (4) so that the surfaces are exactly perpendicular to the axis ring surfaces (12, 14) and are oriented towards the proximal end (18) and that the rounded proximal end is designed as a spherical cap (20) with a smooth, uninterrupted surface (22). 2. Dental implant according to claim 1, characterized by two Constrictions (8, 10), with dif ». the proximal End (18) closer constriction (10) adjoins the spherical cap (20) and wherein the diameter (2R) of the cylindrical Shank (6), the cylindrical section (24) between the two constrictions and the spherical cap (20) the same are. 3. Dental implant according to claim 1 or 2, characterized in that the transition surface from the first constriction (8) to the section located above the second constriction (10) (24) is a conical surface (26) which widens towards the proximal end and whose opening angle is 30. 4. Dental implant according to claim 1 or the following, characterized in that that the transition surface from the second constriction (10) to the spherical cap (20) is one to the proximal At the end of the widening conical surface (28), the opening angle of which is 30 °. 7534861 06/23/77