IMPRESSION COPING FOR IMPLANT OPERATION
TECHNICAL FIELD The present invention relates to impression coping for implant treatments capable of smoothly maintaining heights and angles of impressed portions upon taking teeth impressions to perform precise treatments.
More particularly, the present invention relates to impression coping for implant treatments capable of performing precise treatments by taking an auxiliary coping together in a state fixed to an impression material upon taking a teeth impression, precisely molding a teeth pattern of a patient, and fabricating a prosthetic device in the same as a shape of natural teeth.
BACKGROUND ART In general, the implant treatments are to mold a prosthetic device of artificial teeth and join it into an abutment by mounting an screw-shaped artificial tooth root, that is, a fixture, formed in titanium(Ti) of body-friendly substance into alveolar bone by a drilling job and tightly coupling the fixture to an abutment as bone adjacent the mounted fixture is joined and hardened.
In comparison with the bridge which is the most general teeth restoration method, the implant treatments can be applied only to impaired portions without destructing adjacent teeth or soft tissue or bone tissue, and maintained and supported by the bone tissue so that force continues to be applied to the bone tissue to delay an absorption speed of the bone tissue and restore a chewing force to the same level as natural teeth as well as restore esthetic appearance nearly to the same level as natural teeth, which leads the implant treatments to a worldwide trend in restoring teeth.
In such implant treatments, it is most important to manufacture and precisely position a prosthetic device according to a teeth pattern of a patient, for which a teeth pattern of a patient is taken with an impression material, a precise teeth mold is fabricated, the most precise prosthetic
device is manufactured with the teeth mold, and actual treatments are performed, the impression taking proceeds with coupling an impression coping over an abutment, covering a fluid impression material over the coupling, and taking out a teeth pattern, and, thereafter, a teeth mold is manufactured by pouring gypsum.
However, the impression material is essentially accompanied by fluidity due to its material characteristics so that errors occur to a certain extent even in case that the impression taking is precisely carried out, by which a problem is caused which does not correspond to a teeth pattern of a patient when a prosthetic device is fabricated.
Such a problem in the prior art is disclosed in the United States Patent Nos. 5,993,211 , 5,040,983, and 4,758,161
DISCLOSURE OF INVENTION In order to solve the above problem, it is an object of the present invention to provide an impression coping for implant treatments capable of taking out an auxiliary coping in a state fixed to an impression material upon taking a teeth impression and precisely fabricating a teeth pattern of a patient so that the manufacture and treatments of a prosthetic device are precisely carried out.
It is another object of the present invention to provide an impression coping for implant treatments capable of enhancing esthetic feelings in harmony of heights and angles with adjacent natural teeth after implant treatments. It is yet another object of the present invention to provide an impression coping for implant treatments capable of easily fixing artificial teeth by forming on an abutment threads corresponding to a screw in order for the artificial teeth to be fixed in the abutment by the screw.
In order to achieve the above objects, in an impression coping for implant treatments wherein an abutment is screwed to a fixture mounted into alveolar bone, an impression coping having face parts formed on an outer circumference thereof is coupled to the abutment by a screw joined to
the abutment, over which an impression material is covered to take an impression, the impression coping for implant treatments according to an embodiment of the present invention is characterized in that an auxiliary coping is provided which has an engagement groove formed in an inner side in correspondence to the face parts, undercut parts formed annular on an upper outer circumference and fixed to the impression material, and a face part formed on the outer circumference to be prevented from rotations with respect to the impression material, wherein the impression material is covered after coupling the auxiliary coping to the upper part of the impression coping so that the auxiliary coping is taken in a state fixed to the impression material upon taking an impression.
At this time, according to a preferred embodiment, the face parts formed on the outer circumference of the auxiliary coping are formed in the same or different lengths in the same interval, and an annular locking groove is formed on the outer circumference of the screw and a locking protrusion corresponding to the locking groove is formed in the inner side of the auxiliary coping.
Further, a groove formed annular on the outer circumference of the impression coping is provided to form a protrusion on the impression material when taking an impression, and a step part is formed on the outer circumference of the impression coping to restrain an insertion depth of the auxiliary coping with respect to the impression coping.
In order to solve the above objects, in an impression coping for implant treatments wherein a lower end part of the impression coping is screwed to a fixture mounted into alveolar bone and an impression material is covered over an abutment having a face part formed on an upper outer circumference of a middle boundary part so that an impression is taken, the impression coping for implant treatments according to another embodiment of the present invention is characterized by providing an auxiliary coping having an engagement groove formed on an inner side in correspondence to a length and outer circumference shape of an upper part of the middle
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boundary part, an engagement protrusion bent inside to cover the middle boundary part of the abutment for coupling, and undercut parts formed in multiple stages on the upper part of the outer interference to be fixed to the impression material, wherein the auxiliary coping is coupled on the upper part of the abutment, over which the impression material is covered so that the auxiliary coping is taken in a state fixed to the impression material upon taking an impression.
At this time, according to a preferred embodiment, a face part corresponding to the face part of the abutment is formed on the outer circumference of the auxiliary coping and a bridge is formed to connect plural undercut parts of the undercut parts in an up and down direction so that the auxiliary coping is prevented from rotations with respect to the impression material.
Further, a screw opening corresponding to a screw is formed in the abutment in order for artificial teeth molded by the impression material to be screwed and fixed to the abutment.
BRIEF DESCRIPTION OF THE DRAWINGS The above objects and other advantages of the present invention will become more apparent by describing in detail a preferred embodiment thereof with reference to the attached drawings, in which:
Fig. 1 is an assembled cross-sectioned view for showing an impression coping for implant treatments according to an embodiment of the present invention; Fig. 2a is a perspective view for showing an impression coping for implant treatments according to an embodiment of the present invention;
Fig. 2b is a perspective view for showing a screw for implant treatments according to an embodiment of the present invention;
Fig. 2c is a perspective view for showing an auxiliary coping for implant treatments according to an embodiment of the present invention;
Fig. 2d is a cross-sectioned view for showing an auxiliary coping for implant treatments according to an embodiment of the present invention;
Fig. 3 is a view for showing impression taking procedures by using an impression coping for implant treatments according to an embodiment of the present invention;
Fig. 4 is an assembled cross-sectioned view for showing an impression coping for implant treatments according to another embodiment of the present invention;
Fig. 5 is a perspective view for showing an abutment for implant treatments according to another embodiment of the present invention;
Fig. 6 is a perspective view for showing an auxiliary coping for implant treatments according to another embodiment of the present invention;
Fig. 7 is a cross-sectioned view for showing an auxiliary coping for implant treatments according to another embodiment of the present invention; Fig. 8 is a view for showing impression-taking procedures in use of an impression coping for implant treatments according to another embodiment of the present invention; and
Fig. 9 is an assembled cross-sectioned view for showing an impression coping for implant treatments according to yet another embodiment of the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. [Embodiment 1]
Fig. 1 is an assembled cross-sectioned view for showing an impression coping for implant treatments according to an embodiment of the present invention, Figs. 2a, 2b, 2c, and 2d are views for showing in detail an impression coping, screw, and auxiliary coping for implant treatments according to an embodiment of the present invention, and Fig. 3 is a view for showing impression taking procedures by using an impression coping for implant treatments according to an embodiment of the present invention.
As shown in Fig. 1 to Fig. 3, an impression coping for implant treatments according to an embodiment of the present invention is related to a technology in which an impression coping 2 with triangular faces on its outer circumference for anti-rotation is screw-coupled to an abutment 1 to which a prosthetic device is screwed for coupling and an impression is taken by covering the coupled body with an impression material of synthetic resin having fluidity, which is pertinent to the technology used in the art so that a detailed description on the structure and operations are omitted.
An engagement groove 6 corresponding to the face part 5 formed on the outer circumference of the impression coping 2 is formed in the inner side from a lower end part to an upper end part, an undercut part 7 fixed to the impression material 4 is formed on the upper part of the outer circumference, an auxiliary coping 9 is provided on the upper end part of the outer circumference of which plural grooves 8 are formed in the same or different lengths in the same interval, the auxiliary coping 9 is coupled to the upper part of the impression coping 2, over which the impression material 4 is covered so that the auxiliary coping 9 is taken in a state fixed to the impression material 4.
At this time, a protrusion 11 is formed on the impression material 4 by an annular groove 10 formed on the outer circumference of the impression coping 2 when an impression is taken, an annular locking groove 12 is formed on the upper part of the outer circumference of the screw 3, and a locking protrusion 13 is formed on the inner side of the auxiliary coping 9 to be coupled to the locking groove 12 in the one-touch manner. Further, a step part 14 is formed on the outer circumference of the impression coping 2 to restrain an insertion depth of the auxiliary coping 9 of synthetic resin, and the step part 14 is formed in consideration of a position of the lower end part of the auxiliary coping 9 when the locking protrusion 13 inside the auxiliary coping 9 is coupled to the locking groove 12 of the screw 3.
A reference number 15 not described in the drawings denotes a fixture having threads on its outer circumference which is mounted in the
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alveolar bone after drilling.
Hereinafter, more detailed descriptions are made on impression- taking procedures in use of an impression coping for implant treatments according to an embodiment of the present invention with reference to the accompanying drawings.
As shown in Fig. 3, the abutment 1 is screwed with respect to a fixture 15 mounted into the alveolar bone in a screw-coupling manner, the impression coping 2 is joined with the abutment 1 by means of the screw 3 screwed to the abutment 1 , a lower end part of the auxiliary coping 9 is blocked and stopped by the step part 14 of the impression coping 2 if the auxiliary coping 9 of synthetic resin is inserted into the upper part of the impression coping 2 and pushed downwards in the drawing, and, at this time, the locking protrusion 13 of the auxiliary coping 9 is coupled with the locking groove 12 of the screw 3 in the one-touch fashion so that a position of the auxiliary coping 9 is determined.
At this time, if the impression material 4 is covered over natural teeth adjacent to an implant treatment portion, a teeth shape of a patient appears in the impression material 4 in a groove fashion, and, as the impression material 4 is separated after the impression material 4 is hardened to a certain extent, the undercut part 7 in the upper end part of the auxiliary coping 9 is taken together with the impression material 4 since it is fixed to the impression material 4.
At this time, since the plural grooves 8 having the same or different lengths are formed in the same interval from the upper end part to the lower end part of the outer circumference of the auxiliary coping 9, the auxiliary coping 9 is in a state fixed to the impression material 4 to be prevented from rotations, and its height is easily maintained by the undercut 7 of the upper end part of the auxiliary coping 9 as well.
Even though not shown in the drawings, after taking an impression, an implant analog is mounted in a position of the auxiliary coping 9 and gypsum is poured so that a teeth mold is fabricated, the implant analog is joined to the auxiliary coping 9 and can be simultaneously inserted into the
protrusion 11 , which is naturally formed by means of the groove 10 of the impression coping 2 upon impression taking, formed in the impression material 4 so that a precise height can be maintained.
Accordingly, a teeth mold manufactured as above is formed in the same as the shape of patient's natural teeth, and, since a prosthetic device is manufactured for treatments in use of the teeth mold, the height and angle corresponds to natural teeth so that a prosthetic device can be prevented from movements. [Embodiment 2] Fig. 4 is an assembled cross-sectioned view for showing an impression coping for implant treatments according to another embodiment of the present invention, Figs. 5, 6, and 7 are views for showing in detail an abutment and an auxiliary coping for implant treatments according to another embodiment of the present invention, and Fig. 8 is a view for showing impression-taking procedures in use of an impression coping for implant treatments according to another embodiment of the present invention.
As shown in Figs. 1 to 8, an impression coping for implant treatments according to another embodiment of the present invention is related to a technology that the lower end part thereof is screw-coupled to a fixture 61 mounted into the alveolar bone and an impression is taken by covering with an impression material 54 an abutment 51 having a face part 53 on the upper outer circumference of a middle boundary part 52 thereof, which belongs to a technology used in the art to which the present invention pertains so that detailed descriptions on the structure and operations thereof will be omitted.
An engagement groove 55 is formed in the inner side in correspondence to a length and an outer side shape of the upper part of the middle boundary part 52 of the abutment 51 , an engagement protrusion 56 covering and coupling the middle boundary part 52 in the one-touch fashion is formed to be bent inside, undercut parts 57 fixed to the impression material 54 are formed to be stacked in multiple stages on the upper outer
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circumference, a bridge 58 is formed to connect plural undercut parts 57 of the undercut parts 57 in the same height for anti-rotation, an auxiliary coping 60 forming a face part 59 on the outer circumference in correspondence to the face part 53 of the abutment 51 is provided, over which the impression material 54 is covered so that the auxiliary coping 60 is taken in a state fixed to the impression material 54 when an impression is taken.
Hereinafter, description will be made in more detail on impression- taking procedures in use of an impression coping for implant treatments according to another embodiment of the present invention with reference to the accompanying drawings.
As shown in Fig. 8, the abutment 51 is screw-coupled with respect to a fixture 61 mounted into the alveolar bone of a patient in a screw-coupling fashion, the auxiliary coping 60 of synthetic resin is coupled to the upper end part of the abutment 51 and then pushed downwards in the drawing in order for the engagement protrusion 56 of the auxiliary coping 60 to be covered and elastically coupled with the middle boundary part 52 of the abutment 51 , so that a position of the auxiliary coping 60 is determined.
As the impression material 54 of synthetic resin having fluidity is covered over natural teeth adjacent to an implant treatment portion, the teeth pattern of a patient appears in the impression material 54 in a groove fashion, and, when the impression material 54 is separated after the impression material 58 is hardened to a certain extent, the undercut parts 57 on the upper end part of the auxiliary coping 60 is taken out together with the impression material 54 since it is in a state fixed to the impression material 54.
At this time, the auxiliary coping 60 can be prevented from rotations with respect to the impression material 54 by means of a bridge 58 connected on both sides between the second and third undercuts 57 of the auxiliary coping 60 in the same height and the face part 59 formed on the auxiliary coping 60 in correspondence to the face part 53 of the abutment 51 , and the height of the portion impressed by the undercuts 57 can be smoothly maintained.
Hereinafter, forming a teeth mold after taking the impression is the same as described in Embodiment 1 , so the description thereon will be omitted.
[Embodiment 3] Fig. 9 is an assembled cross-sectioned view for showing an impression coping for implant treatments according to yet another embodiment of the present invention.
As shown in Fig. 9, an impression coping for implant treatments according to yet another embodiment of the present invention is related to the fixture 61 mounted into the alveolar bone, the abutment 51 the lower end part of which is screw-coupled to the fixture 61 and on the middle part of the outer circumference of which the middle boundary part 52 is formed, the auxiliary coping 61 having the engagement protrusion 56 formed on the lower part and coupled to the middle boundary part 52 to be detachably and elastically coupled to the abutment 51 , and a technology that takes an impression by covering an impression material of synthetic resin having fluidity over natural teeth adjacent to an implant treatment portion, which are substantially the same as the impression coping for implant treatments described in Embodiment 2 of the present invention so that the detailed descriptions on the structures and operations therefor will be omitted.
A screw opening 51a corresponding to a screw is formed in the abutment 51 in order that artificial teeth molded by the impression material can be fixed to the abutment 51 by the screw(not shown).
INDUSTRIAL APPLICABILITY
As described above, the present invention takes an auxiliary coping in a state fixed to an impression material upon taking a teeth impression, manufactures a prosthetic device in the same as the shape of natural teeth, and enables precise treatments in a designated position, and can enhance esthetic feelings in harmony of height and angle with adjacent natural teeth. Although the preferred embodiment of the present invention has been described, it will be understood by those skilled in the art that the
present invention should not be limited to the described preferred embodiment, but various changes and modifications can be made within the spirit and scope of the present invention as defined by the appended claims.