CA2452439C - Fixture provided with micro-threads - Google Patents

Abstract

The present-invention relates to an implant having a body (1) with at least one generally cylindrical part to be implanted into bone tissue. The cylindrical part is at least partly provided with threads (2) having a height between 0.02 mm and 0.20 mm.

Description

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In accordance with this invention, there is provided a dental implant having a body with at least one generally cylindrical part to be implanted into bone tissue, said generally cylindrical part being at least partly provided with threads having a height in the range 0.02-0.20 mm characterised in that the distance between adjacent threads, crest to crest, is approximately twice the height of the threads.
Short description of the appended drawings Fig 1 shows an overall view of an implant according to the invention Fig 2 shows a section of the implant in Fig 1 taken along the line I - I
Fig 3 shows an end view according to the line II-II in Fig 2 Fig 4 shows a first preferred embodiment of the microthreads and Fig 5 a second preferred embodiment of the microthreads Detailed description of preferred embodiments of the invention A preferred embodiment of the invention comprises an implant having a generally cylindrical body 1 for insertion into a bore-hole in bone tissue. The envelope surface of the body 1 is provided with very small threads 2, herein called micro-threads since their dimensions are in the micrometer range. These threads will allow the implant to function as a screw. The forward end or the tip of the screw 3a is provided with three cutting edges 4 in conjunction with chip-collecting cavities 3. A result of the presence of the chip-collecting cavities is that parts of the cylindrical part are not provided with threads. In view ~.~~~~a~~~ ~a~~ ~~.~ ~~ ~~~ ~~~.~~
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- WO 94/07428 PC'~ c93/00788 bone tissue in the upper jaw and either can be inserted as a self-tapping screw with a minimum of cutting action or, more importantly, can be just pushed or gently tapped into a bore-hole in the upper jaw.
A further advantage of the invention is that also small, narrow implants will have a maximal stiffness or rigidity which may be important in view of a correct transfer of the main, axial loads to the surrounding to bone tissue, since the the threads will form a comparatively small portion of the entire cross-section of the implant. -As mentioned above, the implant also can be used in the same way as a conventional screw-threaded implant, in which case the hole bored in the bone tissue should have a diameter corresponding to the minor diameter of the thread or somewhat larger. In the latter case, the force needed to cut the threads in the bone tissue will be less.
It should be noted that the invention can be varied in many ways within the scope of the appended claims. It should for instance be emphasized that the invention is not limited to dental implants and that the invention could be applied to any generally cylindrical implant to be inserted into a generally cylindrical bore.
Generally cylindrical in this context should be read as having parts coinciding with the envelope surface of a cylinder circumscribing the implant. A screw-shaped implant having a fluted body (in similarity with a tap}
' thus for instance is to be within the scope of the protection as conferred by the appended claims.

Claims (7)

CLAIMS:

1. Dental implant having a body (1) with at least one generally cylindrical part to be implanted into bone tissue, said generally cylindrical part being at least partly provided with threads (2) having a height in the range 0.02-0.20 mm characterised in that the distance between adjacent threads, crest to crest, is approximately twice the height of the threads.

2. Dental implant according to claim 1, characterised in that said threads have a height in the range 0.02-0.15 mm.

3. Dental implant according to claim 2, characterised in that said threads have a height in the range between 0.05-0.15 mm.

4. Dental implant according to claim 3, characterised in that said threads have a height of approximately 0.10 mm.

5. Dental implant according to any one of the claims 1-4, characterised in that the threads are multiple threads, preferably triple threads.

6. Dental implant according to any one of the claims 1-5, characterised in that the angle between the flanks of the threads is 45° or substantially 45°.

7. Dental implant according to any one of claims 1-5, characterised in that the angle between the flanks of the threads is 60° or substantially 60°.