Patent Application
20080085491
a is a proximal side elevational view of a dental implant according to a first embodiment of the invention.
b is a buccal side elevational view of the dental implant according to the first embodiment of the invention.
c is a downward perspective view of the dental implant according to the first embodiment of the invention.
d is a top plan view of the dental implant according to the first embodiment of the invention.
e is an upward perspective view of the dental implant according to the first embodiment of the invention.
f shows the dental implant according to the first embodiment of the invention after healing.
a is a proximal side elevational view of a dental implant according to a second embodiment of the invention.
b is a buccal side elevational view of the dental implant according to the second embodiment of the invention.
c is a downward perspective view of the dental implant according to the second embodiment of the invention.
d is a top plan view of the dental implant according to the second embodiment of the invention.
e is an upward perspective view of the dental implant according to the second embodiment of the invention.
Referring to
The dental implant of the present invention is generally a cylindrical and un-tapered implant that is later to connect an abutment for the prosthesis. The dental implant of the present invention is supposed to be tapped or knocked into the bony socket.
Referring to
The central portion 60 further comprises a neck 10 disposed on the first section 61. The height of the neck 10 is about 0.5 mm to 3.0 mm. The neck 10 has an edge 101 with some rounding, and the edge 101 is inward and upward to the longitudinal axis of the dental implant. The neck 10 had better be as narrow as possible if it's mechanically approved. With such design the neck 10 has a rim 102, and the rim 102 on the neck 10 would be narrow. The rim 102 toward the buccal side is trimmed to simulate the curvature of buccal gingival. The trimming rim 102 begins from proximal sides downwardly to the buccal side, and is preferably concave. The trimming rim 102 would allow the surgeon not to bury the implant deep in the bone without worrying the exposure of dental implant on the buccal side. And the trimming rim 102 is preferably to match the asymmetrically resorbed ridge. The depth of the trimming rim 102 is between 0.5 mm to 2 mm.
Following the neck 10 are the upper proximal plate-like projection 11 and the buccal and lingual clearances. The upper proximal plate-like projection 11 projects from the first section 61 of the central portion 60 along the horizontal direction, and extends along the vertical direction. In the embodiment, a plurality of upper proximal plate-like projections are mounted on the first section 61 of the central portion 60. The upper proximal plate-like projections 11 preferably are comprehensively pruned at the upper edge to form pruned upper edges 111.
The upper proximal plate-like projection 11 is disposed on a proximal side of the first section 61, and the first section 61 has a buccal clearance and a lingual clearance without the upper proximal plate-like projection, the buccal and lingual clearances are respectively disposed on a buccal side and a lingual side of the first section 61. That is, on the buccal and lingual sides at the level of the upper plate-like projection 11, there are no upper proximal plate-like projections.
In this embodiment, the dental implant 2 comprises a first protrusion 121 and a second protrusion 122, and the first protrusion 121 and the second protrusion 122 are disposed on the lingual and buccal clearance sides of the first section 61 respectively. The first protrusion 121 comprises an isthmus 125 and an enlarged portion 126. The enlarged portion 126 extends from the isthmus 125, and the shape of the enlarged portion 126 is corresponding to the shape of a drilled socket for the dental implant 2. The first protrusion 121 is disposed on a non-horizontal-force-bearing side (lingual), and the second protrusion is disposed on a horizontal-force-bearing side. The non-horizontal-force-bearing side is generally a lingual side of maxilla, or the non-horizontal-force-bearing side is generally a buccal side of mandible.
According to the invention, the protrusion with isthmus is suggested to be placed toward the non-horizontal-force-bearing side. The dental implant of the present invention can catch the bony structure behind the proximal plate-like projection. Combine with the proximal plate-like projection, the dental implant can catch maximum bony structure to resist horizontal force.
The dental implant of the invention effectively deals with the horizontal force by the proximal plate-like projections 11 which are surrounded by ample bony structure. Thus the chance of bony deterioration is reduced. The length of the first section 61 with the upper proximal plate-like projection is about ¼ to ⅖ of the total length of the central portion 60. Because the horizontal force is least felt in the middle section of the central portion, the plate-like projections do not appear in the middle section of the central portion.
The proximal plate-like projections comprise at least one positioning proximal plate-like projection 112. The positioning proximal plate-like projection 112 has a normal part 117 and a lower part 118. The width of the normal part 117 of the positioning proximal plate-like projection 112 is equal to that of the proximal plate-like projection 11. The lower part 118 of the positioning proximal plate-like projection 112 extends outside the outer diameter of the fin 20. Therefore, the width of the lower part 118 of the positioning proximal plate-like projection 112 is bigger than the other proximal plate-like projections 11. In the embodiment, there are two positioning proximal plate-like projection 112 disposed on the proximal sides for positioning the dental implant 2. The proximal plate-like projections 112 are designed to keep the dental implant in the bone with correct direction which will significantly reduce the chance of rotation after surgery. The lower and lateral edges of the lower part 118 are sharp, and the upper edge of the lower part 118 is dull. The lower part 118 of the positioning proximal plate-like projection 12 preferably is comprehensively pruned at the lower edge to form a pruned lower edge, and the pruned lower edge of the lower part is sharp. The sharp edges of the positioning plate-like projections 12 make the insertion of the implant easier and the dull edges make the implant has less chance to exfoliate.
Furthermore, the proximal plate-like projections comprise at least one pulling proximal plate-like projection 112. In the embodiment, the positioning proximal plate-like projection is the pulling proximal plate-like projection. The length of the pulling proximal plate-like projection 112 is higher than other proximal plate-like projections. The pulling proximal plate-like projection 112 has a pulling hole 116 for receiving a pulling device to pull the dental implant 2 in case of any unwanted insertion depth during surgery. Besides, the pulling proximal plate-like projection may have a pulling groove for receiving a pulling device to pull the dental implant.
The proximal plate-like projections 11 comprise at least one normal proximal plate-like projection 113. In the embodiment, the length of the normal proximal plate-like projection 113 is lower than that of the pulling proximal plate-like projection 112; and the width of the normal proximal plate-like projection 113 is smaller than that of the lower part 118 of the positioning proximal plate-like projection 112. That is, the width of the normal proximal plate-like projection 113 is equal to the outer diameter of the fin 20.
The proximal plate-like projections 11 comprise at least one small proximal plate-like projection 114. In the embodiment, the length of the small proximal plate-like projection 114 is lower than that of the normal proximal plate-like projection 113; and the width of the small proximal plate-like projection 114 is smaller than that of the normal proximal plate-like projection 113.
Therefore, the length of the proximal plate-like projections 11 is gradually lower from the pulling proximal plate-like projection 112 to the small proximal plate-like projection 114, and the width of the proximal plate-like projections 11 is gradually smaller from the lower part 118 of the positioning proximal plate-like projection 112 to the small proximal plate-like projection 114.
Next to the plate-like projections 11, the fin 20 projects from the second section 62 of the central portion 60 along the horizontal direction. In the embodiment, a plurality of fins are circularly mounted on the peripheral of the second section 62 of the central portion 60. The fins 20 are not tapered. The length of the second section 62 with the fins is about ⅕ to ½ of the length of the central portion 60.
The lower proximal plate-like projection 30 is disposed on the third section 63 of the central portion 60. The length of the third section 63 with the lower proximal plate-like projection is about ¼ to ⅖ of the total length of the central portion 60. The projecting angels of the lower proximal plate-like projection are suggested to be perpendicular to the tangent of the central portion 60. The lower proximal plate-like projection 30 has a pruned lower edge 301. The pruned lower edge 301 preferably is sharp. Near a bottom 31 of the central portion 60, the edges of the plate-like projections 30 are pruned to match the bottom of the bony socket; that is, to match the shape of the drill.
The central portion 60 further comprises the bottom 31 and a well 13. The bottom 31 is flat. The well 13 is going to be connected to the abutment and has an opening at the top of the central portion 60.
Referring to
The proximal plate-like projection 41 projects from the first section 71 of the central portion 70 along the horizontal direction, and extends along the vertical direction. The proximal plate-like projections 41 and the protrusion 421, 422 on buccal and lingual sides are also similar to the previous description in the first embodiment. The first protrusion 421 comprises an isthmus 425 and an enlarged portion 426. But the ratio differs. The length of the first section 71 with the proximal plate-like projection 41 is about ⅙ to ⅖ of the total length of the central portion 70. The positioning proximal plate-like projection and the pulling proximal plate-like projection 412 is similar to the previous description in the first embodiment.
The fin 50 projects from the second section 72 of the central portion 70 along the horizontal direction. The central portion 70 further comprises a bottom 51 and a well 43. The fins 50 go down to the bottom 51 without shrinking their diameters. The bottom 51 is concave. The bone at the bottom receives a lot of compression force. The concave bottom 51 disperses the force. This is especially important for the short dental implant with large diameter. It needs a drill specially designed to shape the bottom of the bony socket if any length deeper is crucial.
While the embodiments of the present invention have been illustrated and described, various modifications and improvements can be made by those skilled in the art. The embodiments of the present invention are therefore described in an illustrative, but not restrictive, sense. It is intended that the present invention may not be limited to the particular forms as illustrated, and that all modifications which maintain the spirit and scope of the present invention are within the scope as defined in the appended claims.
