SUPPORT A MICROFILETAGE

FIXTURE PROVIDED WITH MICRO-THREADS

Abrégé français

La présente invention concerne un implant ayant un corps (1) comportant au moins une partie généralement cylindrique prévue pour être implantée dans du tissu osseux. La partie cylindrique est au moins en partie pourvue de filaments (2) ayant une hauteur comprise entre 0,02 et 0,20 mm.

Abrégé anglais

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.

Revendications

8

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°.

Description

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There are two ~:~nds or~a~~s systems ~o~,.~° erado-osseous
dental implants which are commonly a~sed today
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The threaded fi~etures have some important advantages~ a

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CA 02452439 2005-09-30
28371-29D
3
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

CA 02452439 2005-09-30
28371-29D
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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

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- WO 94/07428 PC'~ c93/00788
7
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.

Dessin représentatif