Denture connector

A denture connector is provided with a hollow cylindrical female member having a retainer plate embedded in a denture crown. A male member comprises a top planar surface having a lateral projection to which there is attached a retainer block having projecting fins on outer walls thereof. A boss depends from an undersurface of the top planar member and has a bore coextensive with a threaded recess in said undersurface of the top planar member. A threaded screw with a removable expandable sleeve thereon is threaded into the threaded recess to complete the male unit. The male unit is inserted into the female unit whereby a tolerance space exists between the outer diameter of the sleeve and the inner diameter of the female cylinder. The retainer block attached to the lateral projection has a space therein whereby the combination of space and the projector fins ensure firm embedment of the retainer block in denture material.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention pertains to a connector for dentures which includes a female 
member, a male member and a cylindrical insert. 
2. Statement of the Prior Art 
The prior art shows denture connector or attachment devices comprising male 
and female metal members. None of these prior art devices discloses a 
denture attachment comprising a female member, a male member having a 
metal or non-metal sleeve for insertion into the female member and means 
for expanding the male member as wear occurs on the sleeve. 
It is one object of this invention to provide a denture connector or 
attachment which is simple and inexpensive to construct and install. 
It is a further object of this invention to provide a denture attachment or 
connector wherein the female member comprises a hollow cylinder having a 
web attached to the outer wall thereof and further having a retention 
plate attached to the web which plate is embedded in the crown of a tooth. 
The lower edge of the web has a curvature to accommodate the crest of the 
gingiva. 
It is another object of this invention to provide a male member comprising 
a solid cylinder which has a flanged edge for easy insertion into the 
female member. The male member is provided with at least one slit in an 
end thereof whereby the cylinder may be compressed upon the application of 
pressure thereto. 
Yet another object of this invention is to provide a male member with an 
extension shank member whereby the male member may be rotated when 
positioned inside the female member and whereby the male member may be 
attached to adjacent denture material. 
It is yet another object of this invention to provide the male member with 
an outer sleeve which functions as a friction and bearing surface when the 
male member and sleeve are positioned within the female member. 
And still a further object of this invention is to provide means to expand 
the male member which comprises at least one slit in an end of the male 
member through the diameter thereof and a tapered recess to accommodate an 
expansion member. 
And yet another object of this invention is to provide a male member in the 
form of a screw which is threaded into an extension shank member. 
Yet still another object of this invention is to provide a male member and 
insert whose combined diameter is smaller than the inner diameter of the 
female whereby a tolerance space exists therebetween. 
It is still another object of this invention to provide a male member 
comprising an attachment element having a shank projection from a planar 
surface in which there is a threaded recess to receive an end of a 
threaded screw. The attachment element of the male member has a connector 
block having projections to assist in retaining the connector to adjacent 
denture material. 
These and other objects of this invention will become more apparent from a 
review of the specification when taken in light of the annexed drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring now in more detail to the drawings, FIG. 1 shows a denture 
connector 10 comprising a female member 12 attached to the crown of a 
denture 14 and a male member 16 having an attachment shank 17 for 
attaching the male member to adjacent denture area. 
The female member, FIG. 2, comprises a cylindrical portion 18 having an 
outwardly flared upper edge 20. The cylindrical portion 18 is attached to 
a denture crown 14 by a retainer plate 22 and an intermediate web portion 
24. The bottom edge of the web portion 24 is curbed at 26 to accommodate 
the crest 28 of the gingiva which is generally elevated next to the crown. 
The male member 16, FIG. 3, comprises a solid cylindrical member 30 having 
a slit 32 extending across the diameter thereof and extending vertically 
approximately one half the height of the member 30. The male member has a 
flared bottom edge 34 and a protruding lip 36, the purposes of which will 
be explained below. 
The male member 16 has an attachment member 40 comprising an upper planar 
portion 42 which is secured to the upper edge 44 of the male member 30, a 
vertical portion 46 distal from the outer wall 48 of the male member 30 
and a lateral arm 50 in which there are a number of apertures 52. The arm 
50 facilitates rotation of the male member within the female member and 
also facilitates attachment of the male member to the adjacent denture 
area. The apertures in the arm 50 receive some of the denture material 
thus insuring a strong bond. 
In FIG. 4, the plastic sleeve 60 is shown as being slightly smaller in 
height than the height of the cylinder member 30 and also slightly smaller 
in inner diameter than the outer diameter of the cylinder member 30. To 
insert the plastic sleeve, merely compress the bottom area of the male 
cylinder 30 which will yield due to the slit and slip the plastic sleeve 
onto the cylinder 30 until the lip 36 engages the bottom edge 62 of the 
sleeve. Release of the male member will cause the bottom portion 33 to 
expand thus engaging the inner wall 64 of the sleeve 60 in a tight grip. 
The male member 16 with the sleeve attached is then inserted into the 
hollow cylindrical female member 12. Insertion of the male member into the 
female member is made easy by the flared bottom edge 34 of the male member 
and the flared upper edge 20 of the female member. When the male member 
with the sleeve thereon is in position in the female member, the male 
member and sleeve are readily rotatable by manipulation of the lateral arm 
50. Easy rotation of the male member within the female member is desirable 
so as to provide optimum positioning of the lateral arm 50 over the crest 
of the gingiva. FIG. 5 shows an end view of the assembled components 30 
and 60 and the slit 32. FIGS. 6 and 7 show a modification in that the 
cylinder 30 has a double slit 32 and 32' for easy compression of the 
bottom of the cylinder 30. 
FIG. 4 shows the plastic sleeve 60 in position on the cylinder member 30 
with the lip 36 engaged against the bottom edge 62 of the plastic sleeve. 
In the embodiment of FIG. 8, the male member 16 is constructed so that the 
cylinder 30 tapers downwardly and inwardly whereby the outer diameter of 
the cylinder 30 is slightly smaller than the inner diameter of the sleeve 
60. When the sleeve is fitted over the male cylinder 30, a screw 64 is 
threaded into a recess 66 in the cylinder 30 thus expanding the male 
cylinder 30 against the inner wall 68 of the sleeve 60. Should the sleeve 
60 become worn or loose during use, it is only necessary to continue 
inward rotation of the screw 64 to further expand the male cylinder 30 
against the sleeve 60. When the sleeve becomes totally worn or damaged, it 
is removed from the male cylinder 30 and replaced by a new sleeve. 
In FIG. 10 there is shown a modified embodiment of the invention wherein 
the male cylinder is a screw 70 having a threaded portion 72, a shank 
portion 74 and a base portion 76 having a lip 78 which is flared at 80. 
The attachment member 82 comprises a hollow shank portion 86 having 
internal threads 86 to receive the threaded end 73 of the screw 70. The 
connector has a vertical section 88 and a lateral arm 90 which is embedded 
in adjacent denture material. The nylon sleeve 92 is telescoped onto the 
shank portion 84. The threaded end 73 and shank 74 of the screw 70 are 
telescoped into the sleeve and threaded into the shank 84 until the lip 78 
engages the edge 94 of the sleeve. The assembled screw 70, shank 84 and 
plastic sleeve 92 are shown in FIG. 11. 
FIGS. 12 through 17 disclose yet another modification of the invention. 
FIG. 12 shows a denture connector 110 comprising a female member 112 which 
is designed to be attached to the crown of a denture 14, FIG. 1, and a 
male unit 116 having a shank portion 117 with a lateral projection 121 
which is used in conjunction with a retainer block 160, FIG. 15. 
The female member 112 has a hollow cylindrical portion 118 having a 
retainer plate 122 which is embedded in a denture crown 14 of FIG. 1 and a 
web portion 124 which has a curved edge 126 to accommodate the crest of 
the gingiva, denoted number 28 in FIG. 2. 
The male unit comprises a top member 116 having a planar surface 119, and a 
depending shank 117 from which there extends the lateral projection 121. 
There are a plurality of apertures 123 and 125 in projection 121. Opposite 
top planar surface 119 is another surface 127 with a threaded recess 129. 
Extending from the surface 127 is a conical boss 131 which has a bore 
therethrough in alignment with the recess 129. The conical boss 131 is 
adapted to be inserted into the cylindrical female portion 118. A screw 
133 has a flat end 135 with a slot 137 therein for receiving the blade of 
a tool. The screw 133 has an inwardly tapering wall 134 which is 
complementary and symmetrical with conical boss 131. The screw 133 has a 
shank portion 141 having a threaded end 147 for turning into the threaded 
recess 129. An expandable split sleeve 143 is positioned about the shank 
141 of the screw and serves to fasten the male unit in the cylindrical 
female member. It will be seen that the assemblage of female and male 
units, before expanding the sleeve, will result in a tolerance space 145 
between the inner diameter of the female member and the outer diameter of 
the sleeve. This tolerance space may be in the dimension of between 0.1 mm 
and 0.4 mm. The tolerance space is important to permit ease of movement of 
the male unit in the female portion whereby optimum adjustment of the 
denture connector may be achieved. 
In FIG. 13 there is shown the male unit 116 having the shank 117 having a 
vertical inner wall 150, which extends vertically adjacent the female 
member's cylindrical portion 118 and beyond the midpoint of the length 
thereof when the male unit 116 is completely inserted in the female member 
112 as best seen in FIGS. 12 and 15, and an outer smaller dimensioned wall 
152 which adjoins a top wall 154 of the lateral projection 121. The 
lateral projection 121 has an end wall 156 and a bottom wall 158. A 
removable retainer block 160 is shown to have parallel walls 162 and 164 
defining a slot 166. The slot 166 receives the lateral projection 121. 
Retainer block 160 has a plurality of apertures 168 and 170 which align 
with apertures 123 and 125 in the lateral projection 121. A U-shaped pin 
172 having parallel legs 174 and 176 extends through the apertures 168, 
170 and 123, 125 to retain the retainer block 160 on the lateral 
projection 121. Upon assemblage of 121 and 160, there will be a hollow 
space 180 defined by wall 152, 154, side walls 162 and 164 and inside wall 
182 as best seen in FIG. 15. 
Retainer block member 160, FIG. 14, is provided with spaced parallel 
projection fins 184 and 186 on one wall 162 and projection fins 188 and 
190 on the other wall 164. The fins may be integral with the retainer 
block member 160 or they may form separate pieces secured to the block 160 
by suitable bonding means. 
FIG. 15 is a slightly modified form of the structure of FIG. 12 wherein the 
upper edge of the cylindrical female member 118 is beveled at 142, the 
projection boss 194 is cylindrical and the screw 133a has generally 
vertical walls 196. Again, it will be seen that there is a tolerance space 
145 between the sleeve 143a and the inner diameter of the cylindrical 
female member. 
FIG. 16 shows the sleeve 143a as being a continuous hollow cylinder with 
slightly rounded upper and lower edges 198 and 200. It will be appreciated 
that the edges 198 and 200 may be dimensioned, such as in the form of the 
beveled edges, and that they respectively abut the cylindrical boss 194 
and the flat inner surface of the screwhead formed by the straight wall of 
the screw 133a, FIG. 15. They may be metal or plastic or other material. 
FIG. 17 shows an exploded view of the components of the structure of FIG. 
12 wherein 116 is the male unit with expandable sleeve 143 having a slot 
or slit 151 therein and screw 133. 
In operation, of the embodiment of FIGS. 12, 13 and 17, the female retainer 
plate 122 is embedded in a denture crown 14. The male unit 116 including 
the screw and sleeve is inserted into the female cylindrical portion 118 
so that the inner wall 150 of the male unit's shank 117 extends adjacent 
to, and beyond the midpoint of the length of, the portion 118, as best 
seen in FIGS. 12 and 15. The screw 133 with the sleeve 143 thereon is 
threaded into the recess 129 until the sleeve abuts the slanted edge of 
the boss and the slanted edge of the head of the screw. At this position, 
there will be a tolerance space of between 0.1 mm and 0.4 mm between the 
inner diameter of the female portion and the outer diameter of the sleeve. 
The retainer block 160 is fitted to the lateral projection 121 by the pin 
172 and the combination is then embedded in adjacent denture material. 
Denture material, as will be appreciated, will flow about fins 184, 186, 
188 and 190 and into the space 180 thus ensuring optimum retention in the 
denture material. The screw 133 is then turned into recess 129, thereby 
expanding the sleeve 143 against the cylindrical wall of the female 
member. Crown 14 and the adjacent denture material are now firmly 
connected. Some wear will occur on the sleeve after a period of use. It is 
only necessary to turn the screw 133 further into the recess 129 thus 
continuing the expansion of the sleeve against the wall of the cylindrical 
female member. When the sleeve becomes completely worn, a new one is 
replaced. The operation of the embodiment of FIGS. 15 and 16 is similar in 
that, when the screw 133a is threaded into the cylindrical boss 194, the 
continuous sleeve 143a expands radially under the axial compressive force 
applied by the advancing screw. 
While the invention has been described in detail with respect to a 
preferred embodiment thereof, it will be appreciated by those skilled in 
the art to which the invention pertains that numerous changes may be made 
in the invention without departing from the spirit and scope thereof.