U.S. patent application number 09/853866 was filed with the patent office on 2002-01-10 for heal in-place abutment system.
Invention is credited to Hurson, Steven M..
Application Number | 20020004189 09/853866 |
Document ID | / |
Family ID | 22753545 |
Filed Date | 2002-01-10 |
United States Patent
Application |
20020004189 |
Kind Code |
A1 |
Hurson, Steven M. |
January 10, 2002 |
Heal in-place abutment system
Abstract
A prosthodontic assembly for installing a prosthetic tooth
comprises a dental implant and abutment combination and a healing
cap. The combination includes an implant body portion and an
abutment portion. The implant body portion is located at a distal
end of the combination and is configured to lie at least partially
below a crest of a patient's jawbone. The abutment portion is
located at a proximate end of the combination and is configured to
lie at least partially above the crest of the patient's jawbone.
The abutment portion comprises a flared portion, a shoulder portion
and a final restoration portion. The shoulder portion lies between
the flared portion and the final restoration portion. A healing cap
includes a body portion having a proximal and a distal end. The
body portion defines an inner cavity which is sized and adapted so
that the healing cap fits over the final restoration portion. The
healing cap further includes a tissue retraction flange at the
distal end that extends below the shoulder portion when the healing
cap is coupled to the abutment portion.
Inventors: |
Hurson, Steven M.; (Yorba
Linda, CA) |
Correspondence
Address: |
KNOBBE MARTENS OLSON & BEAR LLP
620 NEWPORT CENTER DRIVE
SIXTEENTH FLOOR
NEWPORT BEACH
CA
92660
US
|
Family ID: |
22753545 |
Appl. No.: |
09/853866 |
Filed: |
May 11, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60203333 |
May 11, 2000 |
|
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Current U.S.
Class: |
433/173 ;
433/172 |
Current CPC
Class: |
A61C 8/0068 20130101;
A61C 8/005 20130101; A61C 8/008 20130101; A61C 8/0054 20130101;
A61C 8/006 20130101; A61C 8/0066 20130101 |
Class at
Publication: |
433/173 ;
433/172 |
International
Class: |
A61C 008/00 |
Claims
I claim:
1. A prosthodontic assembly for installing a prosthetic tooth, the
prosthodontic assembly comprising: a dental implant and abutment
combination that includes an implant body portion and an abutment
portion, the implant body portion located at a distal end of the
combination and configured to lie at least partially below a crest
of a patient's jawbone, the abutment portion located at a proximate
end of the combination and configured to lie at least partially
above the crest of the patient's jawbone, the abutment portion
comprising a flared portion, a shoulder portion and a final
restoration portion, the shoulder portion lying between the flared
portion and the final restoration portion, a healing cap including
a body portion having a proximal and a distal end, the body portion
defining an inner cavity which is sized and adapted so that the
healing cap fits over the final restoration portion, the healing
cap further including a tissue retraction flange at the distal end
that extends below the shoulder portion when the healing cap is
coupled to the abutment portion.
2. An assembly as in claim 1, wherein the tissue retraction flange
also extends away from the flared portion.
3. An assembly as in claim 2, wherein a gap is formed between the
tissue retraction flange and the flared portion.
4. An assembly as in claim 1, wherein the body portion of the
healing cap includes a base portion that is configured to rest at
least partially on the shoulder portion of the abutment
portion.
5. An assembly as in claim 1, wherein the healing cap is coupled to
the abutment portion by an adhesive.
6. An assembly as in claim 1, further including a healing cap screw
having a threaded lower portion, the healing cap screw being
configured to pass through a first opening of the healing cap and
to couple the healing cap to the abutment portion.
7. An assembly as in claim 6, wherein the implant body portion
includes a bore with a threaded section and the abutment portion
includes a threaded post configured to engaged the threaded section
and couple the abutment portion to the implant body portion.
8. An assembly as in claim 6, wherein the first opening includes a
first portion having a first diameter and second portion having a
second diameter, the second diameter being smaller than the first
diameter, the healing cap screw including a head configured to fit
within the first portion and a groove having a diameter smaller
than the second diameter, the healing cap screw being press fitted
into the first opening such that the second portion surrounds the
groove and the head lies within the first portion, the healing cap
screw being free to rotate with respect to the healing cap.
9. An assembly as in claim 1, wherein the flared portion and the
shoulder portion of the abutment portion are integrally formed with
the body portion.
10. An assembly as in claim 9, wherein the final restoration
portion is a separate piece of the abutment portion and includes a
threaded post that is configured to engage a threaded section of a
bore that extends through the shoulder portion and flared portion
into the body portion.
11. An assembly as in claim 1, wherein the abutment portion
includes a distal end configured to be secured to the implant body
portion and further including an indexing boss or recess formed
therein for interlockingly engaging an indexing boss or recess
formed on a proximal end of the implant body portion, the abutment
portion further including a central bore that extends completely
through the abutment portion; the assembly further including a
coupling screw that includes a head and a threaded lower section,
the coupling screw being configured to pass through the central
bore of the abutment and to engage the threaded section of the
implant so that the abutment portion can be coupled to the implant
body portion.
12. An assembly as in claim 11, wherein the head portion of the
coupling screw also includes a threaded section and the assembly
further includes a healing cap screw having a threaded lower
portion, the healing cap screw being configured to pass through a
first opening of the healing cap and to engage the threaded section
of the coupling screw.
13. An assembly as in claim 12, wherein the first opening includes
a first portion having a first diameter and second portion having a
second diameter, the second diameter being smaller than the first
diameter, the healing cap screw including a head configured to fit
within the first portion and a groove having a diameter smaller
than the second diameter, the healing cap screw being press fitted
into said healing cap such that the second portion surrounds the
groove and the head lies within the first portion, the healing cap
screw being free to rotate with respect to the healing cap.
14. An assembly as in claim 11, wherein the indexing boss or recess
formed on the proximal end of the implant body portion comprises an
internal cavity, the internal cavity comprising an interlock
chamber, a post-receiving chamber and a threaded chamber, the
interlock chamber having a cylindrical portion and three
semi-circular channels arranged around a periphery of the
cylindrical portion, the threaded chamber including threads and
being located below the post-receiving chamber, which lies below
the interlock chamber.
15. An assembly as in claim 11, wherein the indexing boss or recess
formed on the proximal end of the implant body portion comprises a
hexagonal boss.
16. An assembly as in claim 11, wherein the final restoration
portion includes a plurality of grooves.
17. An assembly as in claim 1, wherein the healing cap is formed
from a polymer.
18. An assembly as in claim 1, wherein the healing cap is formed
from the group consisting polyester, nylon and combinations
thereof.
19. An assembly as in claim 1, wherein the healing cap is
white.
20. An assembly as in claim 1, wherein the healing cap has a color
that is substantially the same a natural tooth.
21. An assembly as in claim 1, wherein the abutment portion and the
healing cap have round cross-sections.
22. An assembly as in claim 1, wherein the abutment portion and the
healing cap have non-round cross-sections.
23. A method for installing a prosthetic tooth, comprising the
steps of: inserting a distal end of a body portion of a dental
implant and abutment combination into a patient's jawbone during a
first stage surgery; coupling a healing cap to an abutment portion
of the combination, during first stage surgery, such that a tissue
retraction flange of the healing cap extends below a shoulder
portion of the abutment portion, removing the healing cap from the
abutment portion during a second stage surgery, taking an
impression of the combination during the second stage surgery after
the healing cap has been removed from the abutment portion.
24. A method as in claim 23, wherein the step of coupling a healing
cap to an abutment portion of the combination further includes
using an adhesive to couple the healing cap to the abutment
portion.
25. A method as in claim 24, wherein the step of coupling a healing
cap to an abutment portion of the combination, further includes
using a healing cap screw to couple the healing cap to the abutment
portion.
26. A method as in claim 24, further including the step of
threading a threaded post of the abutment portion into a threaded
section of a bore of the implant body portion.
27. A method as in claim 24, further including the step of
attaching the abutment portion to the implant body portion with a
coupling screw that extends through a first bore, which extends
completely through the abutment portion.
28. A method as in claim 27, wherein the step of coupling a healing
cap to an abutment portion of the combination includes engaging a
healing cap screw with a threaded section of a head portion of the
coupling screw.
29. A healing cap for combination with a dental implant in a method
of installing a prosthetic tooth, the healing cap comprising: a
body having a proximal end, a distal end, and a cavity thereon,
sized and adapted such that the distal end will fit over an
abutment, and into a mounted position with respect to the abutment,
the abutment having a radially outwardly extending shoulder; the
body further comprising a tissue retraction surface, which extends
distally of the shoulder when the body in the mounted position.
30. A healing cap as in claim 29, wherein the tissue retraction
surface is on a distally extending tissue retraction flange on the
healing cap.
31. A healing cap as in claim 30, wherein the tissue retraction
flange also extends axially away from the abutment.
32. A healing cap as in claim 31, wherein a gap is formed between
the tissue retraction flange and the abutment.
33. A healing cap as in claim 29, wherein the body includes a base
portion that is configured to rest at least partially on the
shoulder of the abutment.
34. A healing cap as in claim 29, wherein the healing cap is
coupled to the abutment by an adhesive.
35. A healing cap as in claim 29, wherein the healing cap includes
a first opening sized and adapted such that a healing cap screw
having a threaded lower portion can pass through the first opening
and couple the healing cap to the abutment.
36. A healing cap as in claim 35, wherein the first opening
includes a first portion having a first diameter and second portion
having a second diameter, the second diameter being smaller than
the first diameter, the healing cap screw including a head
configured to fit within the first portion and a groove having a
diameter smaller than the second diameter, the healing cap screw
being press fitted into the first opening such that the second
portion surrounds the groove and the head lies within the first
portion, the healing cap screw being free to rotate with respect to
the healing cap.
37. A healing cap as in claim 29, wherein the healing cap is formed
from a polymer.
38. A healing cap as in claim 29, wherein the healing cap is formed
from the group consisting polyester, nylon and combinations
thereof.
39. A healing cap as in claim 29, wherein the healing cap is
white.
40. A healing cap as in claim 29, wherein the healing cap has a
color that is substantially the same a natural tooth.
41. A healing cap as in claim 29, wherein the abutment and the
healing cap have round cross-sections.
42. A healing cap as in claim 29,, wherein the abutment portion and
the healing cap have non-round cross-sections.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] The present application claims priority and benefit under 35
U.S.C. .sctn.119(e) of U.S. Provisional Patent Application Ser. No.
60/203,333 filed May 11, 2000, the entire contents of which are
expressly incorporated herein.
FIELD OF THE INVENTION
[0002] The present invention relates generally to dental implants
and, more particularly, to a heal in-place abutment system
including a healing cap adapted to be received upon a final
abutment.
DESCRIPTION OF THE RELATED ART
[0003] Implant dentistry involves the restoration of one or more
teeth in a patient's mouth using artificial components. Such
artificial components typically include a dental implant and a
prosthetic tooth and/or a final abutment that is secured to the
dental implant. The process for restoring a tooth can be carried
out in three stages.
[0004] Stage I involves implanting the dental implant into the bone
of a patient's jaw. The oral surgeon first accesses the patient's
jawbone through the patient's gum tissue and removes any remains of
the tooth to be replaced. Next, the specific site in the patient's
jaw where the implant will be anchored is widened by drilling
and/or reaming to accommodate the width of the dental implant to be
implanted. Then, the dental implant is inserted into the hole in
the jawbone, typically by screwing, although other techniques are
known for introducing the implant in the jawbone.
[0005] The implant itself is typically fabricated from pure
titanium or a titanium alloy. Such materials are known to produce
osseointegration of the fixture with the patient's jawbone. The
dental implant fixture also typically includes a hollow threaded
bore through at least a portion of its body and extending out
through its proximal end which is exposed through the crestal bone
for receiving and supporting the final tooth prosthesis and/or
various intermediate components or attachments.
[0006] After the implant is initially installed in the jawbone, a
cover screw is secured over the exposed proximal end in order to
seal the internal bore. The patient's gums are then sutured over
the implant to allow the implant site to heal and to allow desired
osseointegration to occur. Complete osseointegration typically
takes anywhere from four to ten months.
[0007] During stage II, the surgeon reaccesses the implant fixture
by making an incision through the patient's gum tissues. The cover
screw is then removed, exposing the proximal end of the implant.
The interior of the implant is thoroughly cleaned and dried. The
surgeon then attaches a temporary healing abutment or a final
abutment to the implant. Typically, the healing or final abutment
includes a threaded post, which is screwed directly into the hollow
threaded bore of the implant. To accurately record, the position
the orientation and the shape of the final abutment, the surgeon
can take a mold or impression of the patient's mouth . The
impression is used to create a plaster model or analogue of the
mouth and the abutment and provides the information needed to
fabricate the prosthetic replacement tooth and any required
intermediate prosthetic components. Stage II is typically completed
by securing a protective cap to the abutment with temporary cement.
Alternatively, a conventional temporary restoration can be attached
to the abutment.
[0008] Stage III involves fabricating and placement of a cosmetic
tooth prosthesis to the implant fixture. The plaster analogue
provides laboratory technicians with a model of the patient's mouth
and the final abutments. Based on this model, the technician
constructs a final restoration. The final step in the restorative
process is attaching the final restoration to the abutment.
SUMMARY OF THE INVENTION
[0009] In accordance with one embodiment, the present invention
provides for a prosthodontic assembly for installing a prosthetic
tooth. The assembly comprises a dental implant and abutment
combination and a healing cap. The combination includes an implant
body portion and an abutment portion. The implant body portion is
located at a distal end of the combination and is configured to lie
at least partially below a crest of a patient's jawbone. The
abutment portion is located at a proximate end of the combination
and is configured to lie at least partially above the crest of the
patient's jawbone. The abutment portion comprises a flared portion,
a shoulder portion and a final restoration portion. The shoulder
portion lies between the flared portion and the restoration
portion. A healing cap includes a body portion having a proximal
and a distal end. The body portion defines an inner cavity which is
sized and adapted so that the healing cap fits over the final
restoration portion. The healing cap further includes a tissue
retraction flange at the distal end that extends below the shoulder
portion when the healing cap is coupled to the abutment
portion.
[0010] In accordance with another embodiment, the present invention
provides for a method for installing a prosthetic tooth. The method
comprises inserting a distal end of a body portion of a dental
implant and abutment combination into a patient's jawbone during a
first stage surgery, coupling a healing cap to an abutment portion
of the combination, during first stage surgery, such that a tissue
retraction flange of the healing cap extends below a shoulder
portion of the abutment portion, removing the healing cap from the
abutment portion during a second stage surgery, and taking an
impression of the combination during the second stage surgery after
the healing cap has been removed from the abutment portion.
[0011] In accordance with yet another embodiment, the present
invention provides for healing cap for combination with a dental
implant in a method of installing a prosthetic tooth. The healing
cap comprises a body having a proximal end, a distal end, and a
cavity thereon, sized and adapted such that the distal end will fit
over an abutment, and into a mounted position with respect to the
abutment. The abutment has a radially outwardly extending shoulder.
The body further includes a tissue retraction surface, which
extends distally of the shoulder when the body in the mounted
position.
[0012] For purposes of summarizing the invention and the advantages
achieved over the prior art, certain objects and advantages of the
invention have been described herein above. Of course, it is to be
understood that not necessarily all such objects or advantages may
be achieved in accordance with any particular embodiment of the
invention. Thus, for example, those skilled in the art will
recognize that the invention may be embodied or carried out in a
manner that achieves or optimizes one advantage or group of
advantages as taught herein without necessarily achieving other
objects or advantages as may be taught or suggested herein.
[0013] All of these embodiments are intended to be within the scope
of the invention herein disclosed. These and other embodiments of
the present invention will become readily apparent to those skilled
in the art from the following detailed description of the preferred
embodiments having reference to the attached figures, the invention
not being limited to any particular preferred embodiment(s)
disclosed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] These and other features of the invention will now be
described with reference to the drawings of the preferred
embodiments, which are intended to illustrate and not to limit the
invention, and in which:
[0015] FIG. 1A is a side view of a dental implant having certain
features and advantages according to the present invention;
[0016] FIG. 1B is a top plan view of part of the dental implant of
FIG. 1A;
[0017] FIG. 1C is a cross-sectional view of the dental implant of
FIG. 1A;
[0018] FIG. 1D is a side view of a modified dental implant without
threads;
[0019] FIG. 1E-G illustrate the implant of FIGS 1A-1C inserted into
a patient's jawbone at three different positions with respect to a
patients jawbone;
[0020] FIG. 2A is a side view of a final abutment having certain
features and advantages according to the present invention;
[0021] FIG. 2B is another side view of the final abutment of FIG.
2A;
[0022] FIG. 2C is a top plan view of the final abutment of FIG.
2A;
[0023] FIG. 2D is a bottom plan view of the final abutment of FIG.
2A;
[0024] FIG. 3A is a partial cross-sectional side view of a coupling
screw having certain features and advantages according to the
present invention;
[0025] FIG. 3B is a top plan view of the coupling screw of FIG.
3A;
[0026] FIG. 4A is a cross-sectional view of a healing cap having
certain features and advantages according to the present
invention;
[0027] FIG. 4B is a bottom plan view the healing cap of FIG.
4A;
[0028] FIG. 4C is a is a closer view of a section of the healing
cap of FIG. 4A;
[0029] FIG. 5A is a cross-sectional view of a healing cap screw
having certain features and advantages according to the present
invention;
[0030] FIG. 5B is a top plan view of the healing cap screw of FIG.
5A;
[0031] FIG. 5C is a bottom plan view of the healing cap screw of
FIG. 5A;
[0032] FIG. 6 is a cross-sectional view of the final abutment, the
coupling screw, the healing cap and the healing cap screw coupled
together;
[0033] FIG. 7 is a cross-sectional view of the implant inserted
into a patients jawbone with the final abutment, the coupling
screw, the healing cap, the healing cap screw, and the implant
coupled to the implant;
[0034] FIG. 8 is a cross-sectional view of the implant inserted
into a patients jawbone with the final abutment, the coupling
screw, and a final restoration coupled to the implant;
[0035] FIG. 9 is a cross-sectional view of a healing cap, a final
abutment and an implant according to the prior art;
[0036] FIG. 10 is another embodiment of a heal in-place abutment
system having certain features and advantages according to the
present invention;
[0037] FIG. 11 is another embodiment of a heal in-place abutment
system having certain features and advantages according to the
present invention;
[0038] FIG. 12 is yet another embodiment of a heal in-place
abutment system having certain features and advantages according to
the present invention; and
[0039] FIG. 13 is still yet another embodiment of a heal in-place
abutment system having certain features and advantages according to
the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0040] FIGS. 1-7 illustrate the primary components of a heal
in-place abutment system having certain features and advantages
according to the present invention. With initial referenced to
FIGS. 1A-1C, a preferred embodiment of a dental implant 10 will be
described. The implant 10 is preferably sized and dimensioned to
receive and support one or more dental attachments or components,
which will be described in detail below. In particular, the dental
implant 10 is sized and dimensioned to support a final abutment to
which a final restoration can be attached. The implant 10 is
preferably made of a dental grade titanium alloy, although other
suitable materials can also be used.
[0041] As best seen in FIG. 1A, the implant 10 includes a body
portion 12, a neck 14, and a collar 16. The body portion 12 is
preferably tapered and includes threads 18 that mate to a preformed
threaded hole or osteotomy formed in the patient's jawbone (not
shown). However, it should be appreciated that the body portion 12
can also be configured so as to be self-tapping. It should also be
appreciated that although the illustrated body portion 12 is
tapered or conical, the body portion 12 can be substantially
cylindrical. Finally, it should be appreciated that the body
portion 12 can be unthreaded, as shown in FIG. 1D, if the surgeon
prefers to use an unthreaded implant 10.
[0042] The collar 16 of the implant is substantially cylindrical
and has a top surface 24 that is substantially flat. The collar 16
is defined in part by a vertical side wall 26 that, in the
preferred embodiment, is approximately 2 millimeters in axial
length.
[0043] The collar 16 forms a "variable placement zone". The length
and configuration the variable placement zone allows for "variable
positioning" of the dental implant 12. That is, the surgeon can
vary the height of the implant 10 with respect to the crest of the
jawbone 110. For example, the surgeon can submerge the collar 16
into the jawbone such that the top surface 24 lies flush with the
crest of the jawbone (FIG. 1E).
[0044] Alternatively, as shown in FIG. 1F, the surgeon can place
the top surface 24 of the implant 10 slight above the jawbone for
esthetics (e.g., level with the alveolar crest). In another
embodiment (FIG. 1 G), the implant 10 can be placed
supra-crestally. That is, the top surface 24 of the implant 10 can
positioned above the crest of the jawbone without exposing the
threads 18 of the body region 12.
[0045] It should, however, be noted that several advantages of the
present invention can be achieved with an implant 10 that (i) does
not include a variable placement zone or (ii) includes variable
placement zone that is smaller or larger than the preferred
embodiment. For example, several advantages of the present
invention can be achieved with an implant without the neck 14
and/or the collar 16. Similarly, the neck 14 and/or collar 16 can
have dimensions that are smaller or larger than the illustrated
embodiment. However, the illustrated embodiment, with the neck
region 14 and collar 16, is preferred because it best allows for
the flexibility described above.
[0046] As best seen in FIG. 1C, the implant 10 also includes an
internal socket 28.
[0047] The internal socket 28 preferably includes a threaded
chamber 30, a post receiving chamber 32, and an anti-rotation
chamber 34.
[0048] With reference to FIGS. 1B and 1C, the anti-rotation chamber
34 has a central portion having a substantially cylindrical shape.
The anti-rotation chamber 34 further includes one or more radially
extending portions rotational engagement portions each comprising a
channel or lobe 36 extending from the top surface 24 to the bottom
of the indexing chamber 34. In the illustrated embodiment, three
engagement portions 35 are provided, each having a substantially
half circular shape. As best seen in FIG. 1B, the channels 36 are
situated and evenly spaced around the perimeter of the indexing
region 34. Each channel 36 may be spaced 120 degrees apart from
each other channel 36. The anti-rotation chamber 34 is designed to
mate with a corresponding anti-rotation region formed on various
mating components, such as, for example, a final abutment. The
anti-rotation chamber 34 primarily serves to prevent relative
rotation between the mating component and the implant 10.
[0049] It should be appreciated that several advantages of the
present inventions can be achieved with an implant that does not
include the anti-rotation chamber 34. However, the implant 10
preferably includes the anti-rotation chamber 34 because it helps
to prevent the relative rotation between the mating components
(e.g., a final abutment) and the implant 10. It should also be
appreciated that the anti-rotation chamber 36 can be formed into a
wide variety of other suitable shapes that may be used with
efficacy, giving due consideration to the goals of providing
anti-rotation of mating components.
[0050] For example, the anti-rotation chamber 36 could comprise a
hexagonal recess or protrusion that is situated on the top surface
18 of the implant 10. Nevertheless, the illustrated arrangement is
preferred because it provides optimal clinical efficacy, ease of
use and also minimizes stress concentrations within the
anti-rotation chamber 34.
[0051] The post-receiving chamber 32 lies between the anti-rotation
chamber 34 and the threaded chamber 30. The post-receiving chamber
32 may have a diameter that is less than the diameter of the
anti-rotation chamber 36. The post-receiving receiving chamber 32
may include a chamfered region 37, which is adjacent the threaded
region 30. As will be explained below, the post-receiving chamber
32 is sized and dimensioned to receive a post that is attached to a
mating dental component. The post and the post-receiving chamber 32
provide lateral support, which prevents the mating component from
tipping off the implant. However, it should be appreciated that
several advantages of the present invention can be achieved with an
implant 10 formed without the post-receiving chamber 32.
[0052] The threaded chamber 30 lies below the post-receiving
chamber 32. The threaded chamber 30 is threaded and has a diameter
that may be less than the post-receiving chamber 32.
[0053] FIGS. 2A-2D illustrate a preferred embodiment of a final
abutment 38 having certain features and advantages in accordance to
the present invention. The final abutment 38 is preferably sized
and dimensioned to mate with the implant 10 described above. It is
also sized and dimensioned to support a final restoration (see FIG.
9). The final abutment 38 is preferably made of a dental grade
titanium alloy, although other suitable materials can be used.
[0054] As best seen in FIG. 2A, the outer surface of the final
abutment 38 preferably includes an upper region 40, a flared region
42, an anti-rotation region 44, and a post 46. In the preferred
embodiment, the upper region 40 is substantially smooth and
tapered. The upper region 40 also has a top surface 48 that is
substantially flat.
[0055] Towards the bottom of the upper region (i.e., the portion
nearest the flared region 42) is a flared portion 45 that flares
outward towards a shoulder 47. The flared region 42 extends from
the ridge and connects the upper region 40 to a bottom surface 50,
which is substantially flat.
[0056] The upper region 40 also preferably includes a plurality of
grooves 51. These grooves 51 help orient and prevent the rotation
of a final restoration 53 (FIG. 8). Accordingly, the final
restoration 53 has an inner surface that matches or engages the
shape of the upper region 40 of the final abutment 38. However,
those skilled in the art will readily appreciate that the upper
region 40 and the grooves 51 can be formed into a variety of other
shapes that can also provide an anti-rotational interface between
the final restoration 54 and the final abutment 38. It should be
appreciated that although the illustrated cross-sections of the
upper region and flared region are round in modified arrangements
the cross-sections can be nonround. For example, the cross-section
of the upper region and flared region can have a non-round
cross-section that resembles the cross-section of a natural
tooth.
[0057] To permanently secure the final restoration 53 , cement can
be applied to the upper region 40 of the final abutment 38.
Alternatively, the final restoration 52 can be coupled to the final
abutment 38 by a screw (not shown). In such an arrangement, a screw
hole (not shown) can be provided on the side of the final abutment
38.
[0058] As best seen in FIG. 2A, the final abutment 38
advantageously includes an inner bore 52 that extends through the
center of the final abutment 38. The inner bore 52 is preferably
defined by a first and second region 54, 56. The diameter of the
first region 54 is preferably slightly larger than the diameter of
the second region 56. Accordingly, a seat 58 is formed between the
first and second regions 54, 56. The seat 58 supports a coupling
screw 60 (see FIG. 3A), which will be described in detail below.
Optionally, the second region 56 can include internal capture
threads (not shown.
[0059] With continued reference to FIG. 2A, the diameter of the
bottom surface 50 is approximately equal to the diameter of the top
surface 24 of the implant 10. Extending from the bottom surface 50
is the anti-rotation region 44, which is sized and dimensioned to
fit within the anti-rotation chamber 36 of the implant.
Accordingly, as best seen in FIGS. 2B and 2D, the anti-rotation
region 44 is substantially cylindrical and includes three
protrusions 60. The protrusions 60 preferably extend along the
entire length of the anti-rotation region 44 and have a half
circular shape. The protrusions 60 are arranged around the
perimeter of the indexing region 44 approximately 120 degrees apart
relative to the center axis of the final abutment 38.
[0060] As with the anti-rotation chamber 36 of the implant 10, it
should be appreciated that several features and advantages of the
present invention can be achieved with a final abutment 38 does not
include the anti-rotation region 44. However, it is preferred that
the abutment 38 include the anti-rotation 44 because it helps to
prevent relative rotation between the implant 10 and the final
abutment 38. It should also be appreciated that the anti-rotation
region 44 can be formed into a wide variety of other suitable
shapes that may be used with efficacy to prevent rotation of the
implant 10 and the final abutment 38.
[0061] Below the indexing region 44 is the post 46. The post 46 is
substantially cylindrical and is sized and dimensioned to fit
within the post-receiving chamber 32 of the implant 10. As
mentioned above, the post 36 provides lateral support to the final
abutment 38 when it is placed upon the implant 10. However, it
should be appreciated that several advantages of the present
invention can be achieved with a final abutment 38 that does not
include a post 45.
[0062] Turning now to FIGS. 3A and 3B, the coupling screw 62 is
sized and dimensioned to extend through the inner bore 52 of the
final abutment 38 and to couple the final abutment 38 to the
implant 10. As with the final abutment 38, the coupling screw 60 is
preferably made of a dental grade titanium alloy. However, other
suitable materials can be used.
[0063] The coupling screw 62 has an externally threaded lower
region 64. The threaded lower region 64 is sized and dimensioned to
engage the threads of the threaded chamber 30 of the implant 10
(see FIG. 1C). The threaded lower region 64 can also engage capture
threads that can be formed on the second region 56 of the final
abutment 38. In such an arrangement, the coupling screw 62 engage
the capture threads so that the coupling screw 62 does not become
disassociated as the final abutment 38 is transferred and fitted to
the patient's mouth.
[0064] The coupling screw 62 also advantageously includes a
hexagonal recess 70 located within a head 72 of the screw 60. The
hexagonal recess 70 allows for the insertion of a hexagonally
shaped tool such as a conventional Allen.RTM. wrench, which can be
used to apply rotational force to the coupling screw 62. The head
72 also advantageously includes outer threads 73, which are formed
on the outer surface 75 of the head 72. The purpose and function of
the outer threads 73 will be described below. Alternatively, the
threads 73 can be formed internally within the recess 70.
[0065] FIGS. 4A-4C illustrate a healing cap 76 having certain
features and advantages according to the present invention. The
healing cap 76 may be made of a synthetic polymer, such as, for
example, polyester or Nylon. However, it should be appreciated that
other suitable materials can also be used. The healing cap 76 is
preferably white or close to natural tooth color so that it has a
natural appearance when it is placed in the patient's mouth.
[0066] The healing cap 76 includes an inner surface 77 which
defines an internal cavity 78. The inner surface 77 also defines a
top opening 80 and a bottom opening 82. The inner surface 77 is
sized and dimensioned such that the that healing cap fits over the
upper region 40 of the final abutment 38 as best seen in FIG. 6.
With particular reference to FIG. 4C, the inner surface 77
preferably includes a stop for limiting advance of the healing cap
76 onto the abutment 38, such as, a base surface 84 that is sized
and dimensioned to rest against the flanged portion 45 of the final
abutment 38.
[0067] With continued reference to FIG. 4C, the healing cap 76 also
preferably includes a tissue retraction flange 86. The tissue
retraction flange 86 is sized and dimensioned such that when the
healing cap 76 is placed upon the final abutment 38 it extends
beyond at least the upper limit of the shoulder 47 of the final
abutment 38. The purpose and function of the tissue retraction
flange 86 will be described below.
[0068] With reference to FIG. 4B, the top opening 80 is preferably
defined by top and bottom portions 88, 90. The diameter of the top
portion 88 is slightly larger than the diameter of the second
portion 90. Accordingly, a seat 92 is formed between the first and
second portions 88, 90. The seat 92 provides support for a healing
cap screw 94 (see FIGS. 5A-C). Alternatively, and/or in addition,
the opening 80 may be flared or chamfered to provide a flared
seating surface.
[0069] As with the final abutment 38, it should be appreciated that
although the illustrated cross-sections of the healing cap 76 are
round in modified arrangements the cross-sections can be non-round.
For example, the cross-sections can have a non-round cross-section
that resembles the cross-section of a natural tooth.
[0070] Turning now to FIGS. 5A-C, the healing cap screw 94 will now
be described.
[0071] The healing cap screw 94 is sized and dimensioned so as
extend through the healing cap 76 and to couple the healing cap 76
to the final abutment 38. The healing cap screw 94 is preferably
made of a dental grade titanium alloy; although, other suitable
materials can be used.
[0072] As best seen in FIG. 5A, the healing cap screw 94 includes a
flange 96, an upper hexagonal recess 98, a barrel 99 and a lower
recess 100. The flange 96 preferably has a diameter that is
slightly smaller than the diameter of the upper portion 88 of the
healing cap 76. Furthermore, as seen in FIG. 6, the flange 96 is
preferably sized and dimensioned such that the top surface 97 of
the flange 98 sits flush with the healing cap 76.
[0073] The hexagonal recess 98 extends through the flange 96 and
allows for the insertion of a hexagonally shaped tool such as a
conventional Allen.RTM. wrench, which can be used to rotate the
healing cap screw 94.
[0074] The threaded recess 100 is positioned on the lower end of
the healing cap screw 94. The threaded recess 100 includes threads
102 that are sized and dimensioned to match the outer threads 74 on
the head 72 of the coupling screw 62. Accordingly, as best seen in
FIG. 6, the healing cap screw 94 extends through the healing cap 76
and can engage the outer threads 74 of the coupling screw 62.
[0075] Preferably, the barrel 99 has a diameter that is slightly
larger than the inner diameter of the bottom portion of the healing
cap 76. The barrel 99 preferably includes a groove 101, which is
located below the flange 96 and has a diameter that is slightly
smaller than the inner diameter of the bottom portion 90 of the
healing cap. As such, the healing cap screw 94 can be press-fit
into the healing cap 76 such that the bottom portion 90 fits into
the groove 101 and the top portion 97 is flush with the top of the
healing cap 76. In this manner, the healing screw 94 is captured by
the healing cap 76 and can rotate freely inside the healing cap 76.
Of course, in a modified arrangement, the healing cap screw 94 can
be configured without the capture feature as shown in FIG. 6.
[0076] In use, the surgeon first places the implant 10 (see FIG. 7)
into the patient's jawbone during Stage I surgery. The surgeon then
places the healing cap 76 over the final abutment 38 and uses the
captured healing cap screw 94 to couple the healing cap 76 to the
final abutment 38. Specifically, the surgeon rotates the healing
cap screw 94 so that the inner threads 102 engage the outer threads
74 of the coupling screw 62. Accordingly, the healing cap 76 is
held securely against the final abutment 38. As will be explained
in more detail below, the healing cap 76 helps to control the
healing and growth of the patient's gum tissue around the implant
site. The healing cap 76 also improves the appearance of the
patient's mouth and provides the patient with a temporary chewing
surface. If desired, the healing cap 76 can also be used to support
a temporary restoration and/or may itself be shaped in the form of
a temporary restoration.
[0077] The patient then returns home and the implant is allowed to
osseointegrate with the jawbone and the patient's gums are allowed
to heal. Once the implant osseointegrates and the gums heal, the
patient returns to the surgeon who takes an impression of the
patient's mouth. The surgeon loosens the healing cap screw 94 and
removes the healing cap 76 from the final abutment 38. At this
point, the surgeon takes the impression of the patient's mouth to
record the position, orientation and shape of the final abutment
within the mouth.
[0078] The impression is used to make a model of the patient's
mouth and to form the final restoration. As mentioned above, the
final restoration 53 (see FIG. 8) has an inner surface that matches
the upper region 40 of the final abutment 38. Accordingly, in a
final procedure, the surgeon can attach the final restoration 53 by
slipping it onto the final abutment 38 cementing it in place and/or
securing it with a screw.
[0079] In a modified arrangement, the final abutment 38 can be
attached during a traditional Stage II surgery. In such an
arrangement, an impression of the final abutment 38 can also be
made during Stage II before the healing cap 76 is attached to the
final abutment 38.
[0080] As best seen in FIG. 7, one of the features and advantages
of the present invention is the way the tissue retraction flange 86
controls the healing and growth of the patient's gum tissue 112
around the final abutment 38. In comparison, FIG. 9 illustrates a
prior art protection cap 150, implant 152 and final abutment 154.
The implant 152 includes a shoulder region 156. The protection cap
150 rests upon the shoulder region 156. Because, the prior art
healing cap 150 does not extend beyond the shoulder region 153, the
gum tissue 112 during a healing period grows near and above the
shoulder region 156. This may causes several problems. For example,
when the protection cap 150 is removed, the gum tissue 112 tends to
relax and fall over the shoulder region 156. When an impression is
taken of the final abutment 154, this fallen gum tissue can
compromise the accuracy of the impression. Moreover, if an
impression cap such as the one disclosed in U.S. Pat. No. 5,688,123
is used, the fallen gum tissue can become pinched between the
impression cap and the shoulder region 156 when the impression cap
is snapped over the shoulder region 156. This can cause discomfort
to the patient. In addition, when a final restoration is attached
to the final abutment 154 and implant 152, the gum tissue can also
become pinched in between the final restoration and the shoulder
region 156.
[0081] In contrast, as shown in FIG. 7, the preferred embodiment of
the healing cap 76 includes a tissue retraction flange 86 that
extends below the shoulder 47 of the final abutment 38. The tissue
retraction flange 86 pushes the gum tissue 112 down and away from
the shoulder 47. The tissue retraction flange 86 also pushes the
gum tissue 112 laterally away from the shoulder 47. Accordingly, a
gap 114 is formed between the gum tissue 112 and the shoulder 47 of
the final abutment 38. Thus, when the healing cap 76 is removed,
the gum tissue is less likely to fall over the shoulder 47. This
arrangement tends to prevent patient's gums from falling over the
shoulder 47 of the abutment when (i) the impression is taken, (ii)
an impression cap is being attached to the abutment and/or when the
final restoration 53 is attached to the abutment 38. This results
in more accurate impressions and minimal discomfort to the
patient.
[0082] The tissue retraction flange 86 sized and dimensioned to
hold the gum tissue 112 far enough away from the shoulder 47 to
achieve some or all the results described above. Generally, the
tissue retraction flange 86 holds the gum tissue 112 at least about
0.25 millimeters below the shoulder, in some embodiments about 0.5
millimeters, in other embodiments 1 millimeter or greater.
[0083] FIG. 10 illustrates a modified embodiment of a heal in-place
abutment system having certain features and advantages according to
the present invention. In this embodiment, the final abutment 38 is
configured to mate with a conventional implant 200, which includes
a hexagonal protrusion 202 situated on the top 204 surface 18 of
the implant 200. Correspondingly, the final abutment 38 includes a
hexagonal recess 206 that is configured to mate with the hexagonal
protrusion 202 of the implant 200. One of the advantages of this
embodiment of the heal-in place abutment system is that it utilizes
a conventional implant 10.
[0084] FIG. 11 illustrates another embodiment of a heal in-place
abutment system having certain features and advantages according to
the present invention. In this embodiment, the final abutment 38
includes a threaded post 208 that is configured to mate with a
threaded chamber 210 formed in the implant 10. Accordingly, the
final abutment 38 is not coupled to the implant 10 by a coupling
screw 62. Instead, the abutment 38 is screwed directly into the
implant 10. Another feature of this embodiment is that the healing
cap screw 94 includes a threaded region 211 that is configured to
engage threads 213 formed in the final abutment 38. One of the
advantages of this arrangement is that it eliminates the need for a
coupling screw. Moreover, the final abutment 39 doesn't need
anti-rotation means such as a hexagonal protrusion or recess.
[0085] FIG. 12 illustrates yet another embodiment of a heal
in-place abutment system having certain features and advantages
according to the present invention. In this embodiment, the implant
10 is a conventional implant that is configured to be placed
supra-crestally (i.e., the top surface 24 of the implant 10 is
positioned above the crest of the jawbone). The implant 10 includes
a flanged surface 214, which includes a shoulder 216. The internal
socket 28 includes a sloped region 218 and a threaded region 202.
The final abutment 38 includes a sloped surface 222 and a threaded
region 224 configured to mate with the internal socket 28 of the
implant.
[0086] The healing cap 76 is configured such that the base surface
84 rests against the flanged surface 214 of the implant 10.
Correspondingly, the tissue retraction flange 86 is configured such
that it extends beyond the shoulder 216 of the implant 10. As with
the previous embodiment, the healing cap screw 94 is configured to
screw directly into the final abutment 38.
[0087] FIG. 13 illustrates still yet another embodiment of a heal
in-place abutment system having certain features and advantages
according to the present invention. As with the previous
embodiment, the final abutment 38 is configured such that it can be
screwed directly into the implant 10. Moreover, the implant 10
includes a flanged surface 214 and a shoulder 216. However, in this
embodiment the healing cap 76 is configured to be temporary
attached by an adhesive, such as, for example cement. This
arrangement, therefore, does not include a healing cap screw 94
and, thus, uses less components.
[0088] Certain objects and advantages of the invention have been
described above for the purpose of summarizing the invention and
the advantages achieved over the prior art. Of course, it is to be
understood that not necessarily all such objects or advantages may
be achieved in accordance with any particular embodiment of the
invention. Thus, for example, those skilled in the art will
recognize that the invention may be embodied or carried out in a
manner that achieves or optimizes one advantage or group of
advantages as taught herein without necessarily achieving other
objects or advantages as may be taught or suggested herein.
[0089] Furthermore, although this invention has been disclosed in
the context of certain preferred embodiments and examples, it will
be understood by those skilled in the art that the present
invention extends beyond the specifically disclosed embodiments to
other alternative embodiments and/or uses of the invention and
obvious modifications and equivalents thereof. Thus, it is intended
that the scope of the present invention herein disclosed should not
be limited by the particular disclosed embodiments described above,
but should be determined only by a fair reading of the claims that
follow.
* * * * *