Patent US4220712A successfully refreshed from Google Patents.
US4220712A
Expired / Lapsed
US
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Dental implant and method of inserting
Assignee: Pantomedical Grifo Sas
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Filing: 1978-03-06
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Granted: 1980-09-02
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Expires: 1998-03-06
Abstract
Abstract The present invention relates to a method and an apparatus for obtaining an artificial alveolus for a pin with a spheric head supporting at least one tooth root or, in connection with a similar device, a bridge carrying more teeth, the apparatus being provided with at least one root assembly. The artificial alveolus is formed by a body with two portions integral with each other. Between the spheric head pin and the alveolus an elastic covering is provided and is capable of being deformed in order to allow springing and slight oscillations of the spheric head pin with respect to the alveolus. Each root assembly is obtained in a body provided with a vertical threaded bore opened upwards. The lower end of the body extends downwards in a shaped cavity divided in sections forming external triangular tips and internal shaped guide tangs among which a little pin is inserted in order to cause the rotation of the tips outwards, said apparatus consisting of titanium, tantalium or other material that does not give rise to the phenomenon of rejection from the organism.
Inventors
- 👤 Nicola Staffolani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:19
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0048; A61C8/005; A61C8/0065; A61C8/0018; A61C8/0033; A61C8/0053; A61C8/0057; A61C8/0069; A61C8/0086; A61C8/0089; A61C8/0054
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
156 words
An apparatus for mounting a dental prosthesis, comprising: a first pin means for carrying a holder means for supporting at least one tooth, said first pin means having a lower spheric head portion; a first body which includes a spheric inner duct means for receiving the lower spheric head portion of the first pin means, said first body having the inner surface of its duct means covered by a layer of an elastomeric material, said first body also having an externally threaded lower end extending downwards; a second body including an upper internally threaded portion and a lower end portion, the bottom of this lower end portion being divided in sections forming guide tangs with external tips; and a second pin means, to be received inside the lower end portion of the second body, for causing and maintaining the outward rotation of the external tips up to substantially transverse anchoring positions when implanted into fibromucous membrane.
Claim 2
Independent Claim
156 words
An apparatus for mounting a dental prosthesis, comprising: a first pin means for carrying a holder means for supporting at least one tooth, said first pin means having a lower spheric head portion; a first body which includes a spheric inner duct means for receiving the lower spheric head portion of the first pin means, said first body having the inner surface of its duct means covered by a layer of an elastomeric material, said first body also having an externally threaded lower end extending downwards; a second body including an upper internally threaded portion and a lower end portion, the bottom of this lower end portion being divided in sections forming guide tangs with external tips; and a second pin means, to be received inside the lower end portion of the second body, for causing and maintaining the outward rotation of the external tips up to substantially transverse anchoring positions when implanted into fibromucous membrane.
Claim 3
Dependent Claim
26 words
Apparatus as in claim 1, wherein the first pin means and its lower spheric head portion are covered by the elastomeric material of the first body.
Claim 4
Dependent Claim
19 words
Apparatus as in claim 1, wherein the external surface of the apparatus above the middle plan is substantially cylindrical.
Claim 5
Dependent Claim
61 words
Apparatus as in claim 1, wherein there are two to five external tips having at least three sided cross sections and, further, wherein lower edges of the external tips, when inserted in a bone, form with the longitudinal axis of the second body, an angle, not greater than 45°, that can be increased to 90° at the end of the operation.
Claim 6
Dependent Claim
22 words
Apparatus as in claim 1, wherein material, preferably titanium, forming the second body is heat treated in order to increase its strength.
Claim 7
Dependent Claim
29 words
Apparatus as in claim 1, wherein the upper internally threaded portion, provided in the second body, is counter-threaded for receiving the externally threaded lower end of the first body.
Claim 8
Dependent Claim
37 words
Apparatus as in claim 1, comprising a bridge provided with at least two arms, each arm forming a second body, the lower portions of said arms being rounded off so as to avoid compression of a bone.
Claim 9
Dependent Claim
14 words
Apparatus as in claim 1, comprising at least two second bodies of equal heights.
Claim 10
Dependent Claim
14 words
Apparatus as in claim 1, comprising at least two second bodies of different heights.
Claim 11
Dependent Claim
142 words
Method of inserting a dental prosthesis, comprising the steps of: incising the gingival fibromucous membrane; forming with a drill a cavity in a bone in order to obtain a seat for inserting at least one root assembly of the prosthesis; inserting the at least one root assembly in said seat; screwing an instrument in said seat of the at least one root assembly so a pin is brought into contact with tangs located at the lower end portion of the at least one root assembly; and applying rapidly a force to the pin in order to insert suddenly the pin among the tangs so that external tips of said tangs are simultaneously rotated out and upwards in order to lock said external tips in the bone in an arrangement substantially radial to the longitudinal axis of the at least one root assembly.
Claim 12
Dependent Claim
142 words
Method of inserting a dental prosthesis, comprising the steps of: incising the gingival fibromucous membrane; forming with a drill a cavity in a bone in order to obtain a seat for inserting at least one root assembly of the prosthesis; inserting the at least one root assembly in said seat; screwing an instrument in said seat of the at least one root assembly so a pin is brought into contact with tangs located at the lower end portion of the at least one root assembly; and applying rapidly a force to the pin in order to insert suddenly the pin among the tangs so that external tips of said tangs are simultaneously rotated out and upwards in order to lock said external tips in the bone in an arrangement substantially radial to the longitudinal axis of the at least one root assembly.
References Cited (Backward Citations)
US2745180A
Cited
US2721387A
Cited
US3497953A
Cited
US3738008A
Cited
US3827145A
Cited
US3955280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |