Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1997-09-16
1999-06-01
Lewis, Ralph A.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
A61C 800
Patent
active
059082984
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to an enossal single tooth implant for a fixed dental prosthesis, comprising an essentially cylindrical base member insertable into a bore introduced into a jaw bone, said base member comprising a blind bore open toward its coronal end, which faces away from the bone and toward the dental prosthesis, a spacer sleeve attached in anti-twist fashion to the coronal face edge of the base member, an implant post directly or indirectly introducible into the blind bore of the base member and at least partially penetrating the spacer sleeve, and a fastening head for the dental prosthesis.
Enossal implants of this type, as disclosed, for example, in German Letters Patent 40 28 855, have definitely proven themselves in practice. Since this type of implant has no adequate means for attaching a dental prosthesis in the form of a crown, which is adapted to the anatomy of the respective patient, there are occasions when this implant is considered inadequate.
U.S. Pat. No. 5,417,568 discloses a seating device for the crown structure of an implant that exhibits a curved contour, so that a favorable matching to the natural shaping of the gums can ensue. The above-described problem can be corrected by this structure.
SUMMARY OF THE INVENTION
The invention is based on the object of improving the enossal single tooth implant of German Letters Patent 40 28 855 to the effect that a dental prosthesis, particularly in the form of a crown, can be attached and can be, particularly adapted to the anatomy of the respective patient in terms of a circumferential edge of the crown.
This object is inventively achieved in that the circumference of the spacer sleeve comprises an all around joining shoulder for the dental prosthesis with the circumferential path of the shoulder deviating from the essentially cylindrical symmetry that is present in the implant, so that the shoulder has a peripherally varying spacing from the face edge of the base member for adaptation to the anatomical conditions.
The invention also proposes that the joining shoulder comprises at least one coronally directed adjustment means which may be a notch, a nose or a combination of a notch and a nose.
It can thereby be provided that the peripheral arrangement of the adjustment means is defined in terms of a circumferential angle with respect to the spacer sleeve.
The invention also provides that the dental prosthesis comprises an elevation or, respectively, depression complementary to the notch and/or nose of the adjustment means.
It can also be provided that the axial height of the joining shoulder is matched to the anatomical conditions.
The invention further proposes that the radial base height of the joining shoulder is adapted to the anatomical conditions.
It can thereby also be provided that the spacer sleeve, namely the region facing the dental prosthesis or coronal region, at least partially serves as fastening head for the dental prosthesis.
The invention also provides that the implant post is connectable to the base member and is secured against twisting.
It can be provided that the implant post, namely the coronal or upper region thereof, at least partially serves as the fastening head for the dental prosthesis.
The invention proposes that the spacer sleeve is fashioned closed at a cervical end, which faces toward the bone receiving the base member, and is insertable into the open, coronal end of the base member and comprises a bore open toward its coronal end with an inside thread for screwing or cementing the implant post in.
It can also be provided according to the invention that the spacer sleeve comprises a cervical centering collar corresponding to the face edge of the base member.
The invention also provides that the coronal end of the base member comprises a cylindrical ring recess for the acceptance of the cervical centering collar of the spacer sleeve.
It can thereby also be provided that the spacer sleeve is provided with a shoulder emplaceable onto the upper face edge of the base member.
REFERENCES:
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patent: 5026285 (1991-06-01), Durr et al.
patent: 5069622 (1991-12-01), Rangert et al.
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patent: 5195891 (1993-03-01), Sulc
patent: 5350301 (1994-09-01), De Buck
patent: 5417568 (1995-05-01), Giglio
patent: 5417569 (1995-05-01), Perisse
patent: 5527182 (1996-06-01), Willoughby
Durr Walter
Kirsch Axel
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