Title of Invention

AN IMPLANT INTENDED TO BE FITTED IN AN IMPLANTATION SITE IN A HOLE

Abstract An implant (5) intended to be fitted in an implantation site in a hole (4) formed in a jaw bone (1) where it is exposed to an impinging force or impinging forces (F1, F2), said implant comprising one or more peripherally extending surfaces (14a), which are arranged at an upper/outer portion of the implant and intended to be placed against a jaw bone part at the outlet opening (4b) of the hole, wherein; the implant is provided with an external thread (5a), by means of which the implant (5) can be screwed into the hole (4); the upper/outer portion has an inner socket (20) for a turning tool; said peripherally extending surfaces (14a) are formed on a flange arrangement; each surface is provided with a pattern (8) of grooves (10) and/or recesses; said pattern of grooves having at least two directions of inclination; the grooves (10) and/or recesses have a depth (D) which lies in the range of 50-100 µm; and the grooves (10) and/or recesses have a width (B) in the range of 100 - 150 µm.
Full Text Implant
The present invention relates to an implant which can
be fitted in an implantation site in a hole formed in a
jaw bone, where the implant is exposed to an impinging
force or impinging forces. The implant comprises one or
more peripherally extending surfaces which are arranged
at its upper/outer portion and which can be placed
against the jaw bone and soft tissue at the outlet
opening of the hole.
The present invention is based, inter alia, on the
concept that osteoconduction can be increased with a
certain type of groove or recess in the surface.
Reference is made in this connection to WO 97/05238
(Boyde) and to the patent application SE 03.03322-2
filed by the Applicant of the present patent
application.
When fitting implants of the type in question, it is
important to be able to achieve excellent
osteoconduction between the jaw bone in question and
the implant and to avoid bone, absorption, even marginal
bone absorption, during the stages of implantation and
incorporation. It is also important that the implant is
able to resist the force or forces which impinge on the
implant in a principal direction. An inclination of the
implant, for example because of the jaw bone situation,
must, not give rise to movements between implant and jaw
bone which prevent a good implantation result. The same
applies when the implant supports a tooth replacement
in a position which, for example during chewing
movements, means that the principal directions of the
force or forces are inclined in relation to the
longitudinal direction of the implant, which can result,
in disadvantageous forces acting on the implant and can
cause a tendency for the implant to loosen.
The main object of the present invention is, among
other things, to solve this problem and it proposes a pattern arrangement of
grooves and/or recesses which, in addition to the known osteoconduction of the
grooves, also makes the implant resistant to inclinations between the principal
direction of an impinging force or impinging forces and the longitudinal direction
of the implant.
The increased resistance to forces directed at an incline in relation to the implant
must also be such as to ensure that bacteria and/or organisms which tend to
cause inflammation do not penetrate from the implant's upper / outer parts (oral
cavity) to the deeper-lying or lower parts of the implant. The invention also solves
this problem.
This invention relates to an implant (5) intended to be fitted in an implantation site
in a hole (4) formed in a jaw bone (1) where it is exposed to an impinging force or
impinging forces (F1, F2), said implant comprising one or more peripherally
extending surfaces (14a), which are arranged at an upper/outer portion of the
implant and intended to be placed against a jaw bone part at the outlet opening
(4b) of the hole,
wherein
the implant is provided with an external thread (5a), by means of which the
implant (5) can be screwed into the hole (4);
the upper/outer portion has an inner socket (20) for a turning tool;
said peripherally extending surfaces (14a) are formed on a flange arrangement;
each surface is provided with a pattern (8) of grooves (10) and/or recesses;
said pattern of grooves having at least two directions of inclination;
the grooves (10) and/or recesses have a depth (D) which lies in the range of 50 -
100 urn; and
the grooves (10) and/or recesses have a width (B) in the range of 100 - 150 urn.
The feature that can principally be regarded as characterizing an implant
according to the invention is that each surface is provided with a pattern of
grooves and/or recesses and that some, for example 20% or more, of the
grooves and/or recesses are arranged so that, in the implanted position, they
extend substantially at right angles in relation to said force or forces which these
latter assume a principal direction or principal directions differing from the
longitudinal direction of the implant.
In further developments of the inventive concept, the grooves and/or recesses
are closed, which means here that there is no connection between the upper and
lower parts of the implant portion in question and that, in this way, passage of
bacteria and/or organisms from the upper to the lower parts of the implant is
prevented. In a preferred embodiment, the recesses are chosen in the range of
50-100 urn and have groove or recess depths in the range of 100-150 urn. In the
case where the implant has an internal socket for a tool, which causes different
material thicknesses at the upper parts of the implant, the pattern arrangement is
provided only
at those parts of the portion having the greater
material thicknesses. Different pattern arrangements
can be provided. Further developments of the inventive
concept are set out, inter alia, in the attached
dependent claims.
The above goes against the prevailing views in the
dental field by proposing that the surface will be
patterned with grooves/recesses. Normally, the aim is
for the surface at the outlet opening of the hole to be
polished so as to make it easier to keep the surface
clean from bacteria and/or organisms of a nature
tending to cause inflammation. Such polishing, however,
counters said osteoconduction function and makes
integration between the surface material of the implant
and the jaw bone difficult. The osteoconduction
function of the grooves improves bone incorporation,
and arranging the grooves in the manner proposed
according to the invention counteracts microscopic
movements and shearing stresses in the already
incorporated bone for the purpose of maintaining the
bone level and of preventing bone absorption. Methods
known per se can be used to produce the groove and
recess arrangements. Thus, it may be possible to use
mechanical working, for example turning, milling or
engraving. It is also known per se to produce the
groove and/or recess arrangement by laser treatment of
the surface. Different implants can be provided with
different patterns to meet different implantation
situations, for example different tooth functions,
implant positions in the dentine, etc. Implants with
different patterns can thus be made available on the
market to provide choice to the specialists concerned.
A presently proposed embodiment of an arrangement
having the features characteristic of the invention
will be described below with reference to the attached
drawings, in which:
Figure 1 is a diagrammatic vertical cross section
through an implantation in the jaw bone where
forces acting on the implant have
directions/principal directions differing
from the longitudinal direction of the
implant,
Figure 2 is a diagrammatic vertical cross section
through an implant which is inclined in the
implantation site in the jaw bone, with the
result that a force with a vertical direction
of action differs from the longitudinal
extent of the implant,
Figure 3 is an enlarged vertical cross section through
a type of groove or recess which contributes
to excellent osteoconduction,
Figure 4 is a vertical view of the closed groove or
recess arrangement in which bacteria are
prevented from moving from the upper parts to
the lower parts,
Figure 5 is a side view of a first pattern
arrangement, developed in the plane of the
figure.
Figure 6 is a perspective view, obliquely-from above,
showing parts of an implant with a number of
different pattern arrangements, and
Figure 7 is a perspective view, obliquely from above,
showing parts of two other types of implants
with a number of different pattern
arrangements.
In Figure 1, a jaw bone is shown diagrammatically by
reference number 1. The jaw bone comprises a soft
tissue part 2 and, lying under this, a bone part
consisting of cortical bone 3a and spongy bone 3b. The
jaw bone is provided with a hole 4. An implant 5 is
fitted in the hole. The hole can have an internal
thread 4a, and the implant is provided with an external
thread 5a, by means of which the implant can be screwed
into the hole in a manner known per se. The implant is
provided with an upper or outer portion 5b which, when
the implant is in position in the jaw bone, can be
regarded as being situated in or surrounded by the soft
tissue 2. Said portion is also arranged at the outlet
opening 4b from the hole 4 to the oral cavity, which is
indicated symbolically by 6. The implant is intended to
support a prosthesis indicated symbolically by
reference number 7. The upper portion 5b of the implant
is provided with a pattern 8 of grooves and/or
recesses. In accordance with the concept of the
invention, the grooves and/or recesses in the pattern
are arranged such that some of the grooves and/or
recesses, for example 20% or more, will be
substantially at right angles with respect to the
forces acting on the implant when said implant is in
the implanted position. Examples of impinging forces
and their directions are indicated by F1 and F2. On
account of the situation in the oral cavity, the
prosthesis type, implant position, etc., the forces Fl
and/or F2 can have principal directions differing from
the longitudinal axis 5c of the implant. These
differences have been defined in Figure 1 with the aid
of angles a and; p. Each angle in cross section thus
gives the difference between the respective direction,
of each impinging force.
The differences between the longitudinal axis of the
implant and the principal direction of the force can
also be caused by the implant assuming an oblique
position. Such an example is shown in Figure 2 where
the implant 5/ is set obliquely in the parts 2 and 3 of
the jaw bone 1. The longitudinal axis Sc' of the
implant thus slopes in the jaw bone, and a force F3
applied vertically to the implant has a principal
direction differing from said longitudinal axis 5c' by
an angle ?. In this case too, some of the grooves
and/or recesses are arranged substantially at right
angles to the principal direction of the force F3.
Figure 3 is intended to show an example of a very
advantageous groove construction which also promotes
the aforementioned osteoconduction. The groove or the
recess will have a depth D in the range of 50 - 100 µm,
preferably of the order of ca. 70 µm. The width or
breadth B of the groove will be chosen in the range of
100 - 150 µm and will preferably be ca. 110 µm. The
groove or recess is arranged in the upper portion of
the implant (see 5b in Figure 1). In Figure 3, the
portion has been designated by 9. The groove has been
given reference number 10. The value B is calculated or
measured at the positions of the bevel 9a and 9b.
In accordance with what has been stated above, said
grooves will preferably form a closed system. In
accordance with Figure 4, the jaw bone part 11 bears
via its inner surface against the portion 9. In Figure
4, said groove or recess arrangement is represented by
groove parts 10a, 10b and 10c which, in Figure 4,
extend substantially. at right angles to the plane of
the figure. In Figure 4, growth of bone established in
the groove has also been shown and is indicated by 12
In accordance with the concept of the invention, said
groove arrangements 10a, 10b and 10c are not open
toward the upper parts 9d of the portion 9 and the
lower parts 9e of said portion, with the result that
any accumulation of bacteria and/or organisms 13 cannot
penetrate down from said upper parts 9d to the deeper-
lying parts 9e of the implant. In this way it is
possible to effectively prevent inflammation tendencies
in said underlying parts which would be caused by said
bacteria and/or organisms.
In Figure 5, the aforementioned portion is indicated by
14. In the present case, the portion is shown developed
in a plane. The longitudinal axis of the implant is in
this case designated by 15, and an oblique impinging
force is indicated by F4. The principal direction of
the force F4 is indicated by a dot-and-dash line. The
angle between the principal direction of the force F4
and the longitudinal axis 15 is indicated by 8. The
pattern indicated in Figure 5 is shown by 16. The
pattern is composed of a set of parallel groove parts
16a, 16b, 16c, 16d, 16e and 16f. The distance between
the groove parts can be the same or can vary between
the various groove parts. The sets of groove parts are
angled in relation to one another by an angle A, so
that the grooves have at least two directions of
inclination. In one embodiment of the pattern
arrangement, the angle range for ? can be chosen within
10 - 45°. The impinging force F4 can in principle be
divided into a vertical force component which coincides
with or extends parallel to the longitudinal axis 15,
and a horizontal force component which extends at right
angles in relation to said longitudinal axis 15. The
pattern arrangement can be configured such that the
vertical force component substantially exceeds the
horizontal force component, so that forces are
effectively taken up by the groove arrangement even in
the case where the force direction of F4 is not
entirely at right angles to the actual groove part, for
example groove part 16e. The groove parts and/or
recesses can extend all round the peripheral surface
14a or along selected parts of the surface as seen in
the circumferential direction, thereby forming groups
of patterns.
Figure 6 shows a number of other embodiments of pattern
arrangements at the upper, cylindrical portion 17 of
the implant. The pattern configuration in question can
consist of a sinusoidal arrangement disposed so that
forces are taken up in accordance with the above. The
implant in this case is provided with an internal
socket for a turning tool (not shown). The socket is
indicated by 20 and can be a socket with two or more
wings, a toothed socket, a polygonal socket, etc. In
this case, the portion 17 is provided with a number of
pattern arrangements 18a, 18b, etc., along the
circumferential surface 17. The arrangement of patterns
can be provided at locations which, because of the
socket arrangement 20, have a greater thickness, than
other locations. This avoids undue weakening of the
portion at parts of lesser thickness.
Figure 7 shows a number of embodiments of patterns, on
the one hand on what is called a scalloped implant 21,
see Figure 7a, and on the other hand on an implant with
a conical circumferential surface 22, see Figure 7b.
Regarding scalloped implants, reference is made for
example to WO 03/059189. The pattern arrangement can be
divided up along the surface in the same way as in the
case according to Figure 6. A common feature of the
pattern arrangement parts is that they have at least
two directions of inclination.
Different implants with different patterns can be made
available on the general market. The implants with the
different patterns can be provided for different main
types of implantation cases. The illustrative
embodiments according to Figures 1 and 2 can relate to
a case where different implantation situations are
present in the same patient The inclinations of the
principal directions of the impinging force or forces
are dependent on the use (chewing movements) and
positions and on the tooth type which the prosthesis in
question is intended to represent Said portion of the
implant can consist of a flanged portion.
The invention is not limited to the embodiment shown by
way of example above, and instead it can be modified
within the scope of the attached patent claims and the
inventive concept.
WE CLAIM:
1. An implant (5) intended to be fitted in an implantation site in a hole (4) formed
in a jaw bone (1) where it is exposed to an impinging force or impinging forces
(F1, F2), said implant comprising one or more peripherally extending surfaces
(14a), which are arranged at an upper/outer portion of the implant and intended
to be placed against a jaw bone part at the outlet opening (4b) of the hole,
wherein
the implant is provided with an external thread (5a), by means of which the
implant (5) can be screwed into the hole (4);
the upper/outer portion has an inner socket (20) for a turning tool;
said peripherally extending surfaces (14a) are formed on a flange arrangement;
each surface is provided with a pattern (8) of grooves (10) and/or recesses;
said pattern of grooves having at least two directions of inclination;
the grooves (10) and/or recesses have a depth (D) which lies in the range of 50 -
100 µm; and
the grooves (10) and/or recesses have a width (B) in the range of 100 - 150 µm.
2. The implant as claimed in claim 1, wherein the inner socket (20) is polygonal,
toothed or with two or more wings, and the grooves and/or the recesses are
arranged at parts (17b, 17c) of greater material thickness at the upper/outer
portion.
3. The implant as claimed in any of the preceding claims, wherein the pattern
comprises straight and parallel groove parts (16a, 16a') which are arranged
round all or part of the peripheral surface, and in that the groove parts extend 10
- 45° in relation to a cross section surface which is perpendicular to the
longitudinal axis (15) of the implant.
4. The implant as claimed in any of claims 1 - 3, wherein the pattern comprises
sinusoidal groove and/or recess parts (18b, 18c, 18d).
5. The implant as claimed in any of claims 1-2, wherein the pattern comprises
one or more groups of grooves (18d) arranged mutually parallel and with different
longitudinal extents.
6. The implant as claimed in any of claims 1-5, wherein said flange arrangement
(17) is cylindrical.
7. The implant as claimed in any of claim 1 - 5, wherein said flange arrangement
(22) is conical.
8. The implant as claimed in any of claim 1 - 5, wherein said flange arrangement
(21) is scalloped.
9. The implant as claimed in any of the preceding claims, wherein the grooves
(10) and/or recesses have a depth (D) which is ca. 70 µm.
10. The implant as claimed in any of the preceding claims, wherein the grooves
(10) and/or recesses have a width (B) of ca. 110 µm.

An implant (5) intended to be fitted in an implantation site in a hole (4) formed in
a jaw bone (1) where it is exposed to an impinging force or impinging forces (F1,
F2), said implant comprising one or more peripherally extending surfaces (14a),
which are arranged at an upper/outer portion of the implant and intended to be
placed against a jaw bone part at the outlet opening (4b) of the hole, wherein; the
implant is provided with an external thread (5a), by means of which the implant
(5) can be screwed into the hole (4); the upper/outer portion has an inner socket
(20) for a turning tool; said peripherally extending surfaces (14a) are formed on a
flange arrangement; each surface is provided with a pattern (8) of grooves (10)
and/or recesses; said pattern of grooves having at least two directions of
inclination; the grooves (10) and/or recesses have a depth (D) which lies in the
range of 50-100 µm; and the grooves (10) and/or recesses have a width (B) in
the range of 100 - 150 µm.

Documents:

01563-kolnp-2006 abstract.pdf

01563-kolnp-2006 claims.pdf

01563-kolnp-2006 correspondence others-1.1.pdf

01563-kolnp-2006 correspondence others.pdf

01563-kolnp-2006 description (complete).pdf

01563-kolnp-2006 drawings.pdf

01563-kolnp-2006 form-1.pdf

01563-kolnp-2006 form-2.pdf

01563-kolnp-2006 form-26.pdf

01563-kolnp-2006 form-3.pdf

01563-kolnp-2006 form-5.pdf

01563-kolnp-2006 international publication.pdf

01563-kolnp-2006 international search report.pdf

01563-kolnp-2006 pct form.pdf

01563-kolnp-2006-correspondence.pdf

01563-kolnp-2006-form-18.pdf

1563-KOLNP-2006-ABSTRACT.pdf

1563-kolnp-2006-assignment-1.1.pdf

1563-kolnp-2006-assignment.pdf

1563-KOLNP-2006-CANCELLED DOCOMENT.pdf

1563-KOLNP-2006-CLAIMS.pdf

1563-kolnp-2006-correspondence-1.1.pdf

1563-kolnp-2006-correspondence.pdf

1563-KOLNP-2006-DESCRIPTION COMPLETE.pdf

1563-KOLNP-2006-FORM 1.pdf

1563-kolnp-2006-form 16.pdf

1563-KOLNP-2006-FORM 2.pdf

1563-KOLNP-2006-FORM 5.pdf

1563-KOLNP-2006-FORM-27.pdf

1563-kolnp-2006-granted-abstract.pdf

1563-kolnp-2006-granted-claims.pdf

1563-kolnp-2006-granted-correspondence.pdf

1563-kolnp-2006-granted-description (complete).pdf

1563-kolnp-2006-granted-drawings.pdf

1563-kolnp-2006-granted-form 1.pdf

1563-kolnp-2006-granted-form 18.pdf

1563-kolnp-2006-granted-form 2.pdf

1563-kolnp-2006-granted-form 26.pdf

1563-kolnp-2006-granted-form 3.pdf

1563-kolnp-2006-granted-form 5.pdf

1563-kolnp-2006-granted-reply to examination report.pdf

1563-kolnp-2006-granted-specification.pdf

1563-KOLNP-2006-OTHERS.pdf

1563-kolnp-2006-pa.pdf

1563-KOLNP-2006-PCT PRIORITY DOCUMENT NOTIFICATION.pdf

1563-KOLNP-2006-PETITION UNDER RULE 137.pdf

1563-KOLNP-2006-REPLY TO EXAMINATION REPORT.pdf

abstract-01563-kolnp-2006.jpg


Patent Number 240313
Indian Patent Application Number 1563/KOLNP/2006
PG Journal Number 19/2010
Publication Date 07-May-2010
Grant Date 04-May-2010
Date of Filing 07-Jun-2006
Name of Patentee NOBEL BIOCARE AB (PUBL)
Applicant Address BOX 5190 SE-402 26 GOTEBORG
Inventors:
# Inventor's Name Inventor's Address
1 JORNEUS, LARS RIABERGSVAGEN 7B SE-43030 FRILLESAS
2 DURIC, SANEL C/O LUNDGREN ODINGSGATAN 22 B SE 41103 GOTEBORG
PCT International Classification Number A61C 8/00
PCT International Application Number PCT/SE2004/001917
PCT International Filing date 2004-12-20
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 0303460-0 2003-12-22 Sweden