Dentistry – Prosthodontics – Holding or positioning denture in mouth
Reexamination Certificate
1999-09-10
2001-09-11
Wilson, John J. (Department: 3732)
Dentistry
Prosthodontics
Holding or positioning denture in mouth
C433S173000
Reexamination Certificate
active
06287118
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an oral implant to be used to secure artificial teeth, which are used in place of lost natural teeth, in the oral cavity, and more particularly to an oral implant that imposes minimal physical stress on the patient during implantation, reduces the incidence of inflammation following implantation, and has other features.
2. Description of the Related Art
Oral implants are designed to secure artificial teeth, which are used in place of lost natural teeth, in the oral cavity. These oral implants are partially embedded and secured in the alveolar bone, and the artificial teeth are attached to the portions of the oral implants that are left to protrude into the oral cavity from the gums for this purpose.
Plate types, screw types, and perforated hollow cylinder types are widely used as oral implants. These are secured by being inserted partway in the alveolar bone. A drawback is that considerable physical stress is imposed on the patient during insertion of such oral implants, and postoperative inflammation or pain often accompanies the procedure because of unnecessary stress being induced in the alveolar bone. Gaps form between the oral implant and the bone, and the implant becomes loose as a result of mastication-induced cyclic stress, prolonged use, or the like, and bacteria penetrate into the gaps, causing inflammation. A resulting disadvantage is; that the oral implants must be replaced, and the alveolar bone itself is fractured.
SUMMARY OF THE INVENTION
The present invention provides a sheet type oral implant.
The present invention is an oral implant to be used by being secured on an alveolar bone, this oral implant comprising a sheet portion whose shape on the bone side matches in an inverted convex-concave arrangement the surface shape of the alveolar bone; fixing hooks provided to the edges of the sheet portion and designed for securing the oral implant on the alveolar bone and preventing the implant from falling off; and a post portion for mounting an artificial tooth.
With the present invention, minimal physical stress is imposed on the patient during the implantation of the oral implant, incidence of inflammation following implantation is reduced, the alveolar bone is prevented from being fractured when the oral implant is used, and other merits are provided.
DETAILED DESCRIPTION OF THE INVENTION
In view of the above and as a result of extended research on the use of titanium-based materials as biomaterials, the inventors perfected the present invention upon discovering that an implant can be adequately secured without being inserted into the bone.
Specifically, an object of the present invention is to provide an oral implant designed to fix an artificial tooth in the oral cavity.
Another object of the present invention is to provide an oral implant that imposes minimal physical stress on the patient during implantation, reduces the incidence of inflammation following implantation, and has other features.
Still another object of the present invention is to provide an oral implant that allows an implant to be secured without implantation into the bone.
Specifically, the present invention makes it possible to reduce the physical stress imposed on the patient during the implantation of an oral implant, to prevent the alveolar bone itself from being fractured during the use of the oral implant, and to solve other problems by providing an oral implant that comprises a sheet portion
2
shaped so as to cover an alveolar bone
4
, fixing hooks
3
disposed at the tips of the sheet portion and designed for securing the implant on the alveolar bone and preventing the implant from falling off, and a post. portion
1
for mounting an artificial tooth, as shown in
FIGS. 1 and 2
; and by providing an oral implant configured as shown in
FIGS. 4 and 5
and furnished with an auxiliary pin
9
designed to provide reinforcement and to prevent the implant from falling off the alveolar bone.
The present invention, which is designed to overcome the aforementioned shortcomings, comprises the following technical means.
(1) An oral implant, which is used by being secured on an alveolar bone, this oral implant comprising a sheet portion whose shape on the bone side matches in an inverted convex-concave arrangement the surface shape of the alveolar bone; fixing hooks provided to the edges of the sheet portion and designed for securing the oral implant on the alveolar bone and preventing the implant from falling off; and a post portion for mounting an artificial tooth.
(2) An oral implant, which is used by being secured on an alveolar bone, this oral implant comprising a sheet portion configured so as to cover the alveolar bone; fixing hooks provided to the edges of the sheet portion and designed for securing the oral implant on the alveolar bone and preventing the implant from falling off; and a post portion for mounting an artificial tooth.
(3) The oral implant set forth in (1) above, comprising the aforementioned sheet portion, fixing hooks, and post portion; and an auxiliary pin for reinforced mounting on the alveolar bone.
(4) The oral implant set forth in (2) above, comprising said sheet portion, fixing hooks, and post portion; and an auxiliary pin for reinforced mounting on the alveolar bone.
(5) The oral implant set forth in (1) or (2) above, comprising notches in the lateral sections of the sheet portion.
The present invention will now be described in further detail.
Aimed at overcoming the shortcomings described in the Description of the Related Art section, the present invention provides (1) an oral implant whose structure comprises a post portion for mounting an artificial tooth, a sheet portion whose shape on the bone side matches in an inverted convex-concave arrangement the surface shape of the alveolar bone, and fixing hooks for securing the oral implant on the alveolar bone and preventing the implant from falling off, as shown in
FIGS. 1
,
2
, and
3
; (2) an oral implant whose structure comprises a post portion for mounting an artificial tooth, a sheet portion configured so as to cover the alveolar bone with the proviso that the gap between the alveolar bone and the sheet portion be filled with bone cement during use, and fixing hooks provided to the edges of the sheet portion and designed for securing the oral implant on the alveolar bone and preventing the implant from falling off; (3) an oral implant comprising the structure of (1) above and an auxiliary pin designed to provide reinforcement and to prevent the implant from falling off the alveolar bone, as shown in
FIGS. 4
,
5
, and
3
; and (4) an oral implant comprising the structure of (2) above and an auxiliary pin designed to provide reinforcement and to prevent the implant from falling off the alveolar bone. Specifically, the present invention relates to an oral implant comprising a sheet portion whose shape on the bone side matches in an inverted convex-concave arrangement the surface shape of the alveolar bone; fixing hooks provided to the edges of the sheet portion and designed for securing the oral implant on the alveolar bone; a post portion
1
disposed substantially in the center of the sheet portion and designed for securing an artificial tooth; and, optionally, an auxiliary pin mounted and secured in a hole formed in the alveolar bone and endowed with the function of reinforcing the bond with the alveolar bone.
The present invention will now be described with reference to drawings. The drawings disclose preferred examples of the oral implant of the present invention.
The present invention is an oral implant configured as shown in
FIGS. 1 and 2
. This oral implant is used such that the fixing hooks
3
provided to all or parts of the tips of the sheet portion
2
are inserted into grooves (hereinafter referred to as “grooves in the lateral faces of the alveolar bone”) bored in advance at prescribed positions in the lateral faces of the alveolar bone
4
, and the oral implant is secured on the alveolar bone.
The oral imp
Kamiya Akira
Kato Makoto
Naganuma Katsuyoshi
Nonami Toru
Watatsu Akira
Agency of Industrial Science and Technology
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Wilson John J.
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