Patent US4178686A successfully refreshed from Google Patents.
US4178686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial tooth with implantable tooth root
Assignee: NEODONTICS Inc A CORP OF NV
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Filing: 1978-01-06
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Granted: 1979-12-18
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Expires: 1998-01-06
Abstract
Abstract An artificial tooth with an implantable root adapted to permanently grow together with the jawbone and, also under high mechanical loads as is the case for natural teeth, will not allow for the production of a rejection or repelling reaction between the natural bone and the implant. The tooth root is essentially constituted of a biostable polymer matrix which is compatible with human tissue, in which there is introduced reabsorbable bioreactive calcium phospate in a finely dispersed form, which is encompassed by a thin porous layer of non-reabsorbable calcium phospate, and into which there is inserted a core as a connecting member for the mounting of a dental superstructure in the form of a tooth crown, a fastening element for dental bridges or the like. In the region of the tooth neck which is encompassed by the gingiva, an intermediate member is located between the tooth root and the superstructure, which is formed of tissue-compatible material and which supports the close contact of the gingiva, and by means of which the dental superstructure is connected with the tooth root in a shock-absorbent manner.
Inventors
- 👤 Guido Riess
- 👤 Helmut Heide
- 👤 Roland Reiner
- 👤 Kari Koster
- 👤 Gunther Brotz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:45
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0018; A61C1/00; A61C1/08; A61C1/082; A61C1/084; A61L; A61L27/00; A61L27/40; A61L27/44; A61L27/46
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
122 words
An artificial tooth including an implantable tooth root, said tooth root being essentially constituted of a biostable polymer matrix compatible with human tissue; reabsorbable, bioreactive calciumphosphate in finely dispersed form being introduced in said polymer matrix; a thin, porous layer of essentially non-reabsorbable calciumphosphate encompassing said bioreactive calciumphosphate; a core being inserted in said polymer matrix, said core forming connecting means for mounting of a dental superstructure thereon; and an intermediate member being arranged in the region of the tooth neck encompassed by the gingiva and extending between the tooth root and the dental superstructure, said intermediate member being constituted of a tissue-compatible material supportive of the sealing contact of the gingiva, said dental superstructure being shock-absorbingly connected with said tooth root.
Claim 2
Dependent Claim
122 words
An artificial tooth including an implantable tooth root, said tooth root being essentially constituted of a biostable polymer matrix compatible with human tissue; reabsorbable, bioreactive calciumphosphate in finely dispersed form being introduced in said polymer matrix; a thin, porous layer of essentially non-reabsorbable calciumphosphate encompassing said bioreactive calciumphosphate; a core being inserted in said polymer matrix, said core forming connecting means for mounting of a dental superstructure thereon; and an intermediate member being arranged in the region of the tooth neck encompassed by the gingiva and extending between the tooth root and the dental superstructure, said intermediate member being constituted of a tissue-compatible material supportive of the sealing contact of the gingiva, said dental superstructure being shock-absorbingly connected with said tooth root.
Claim 3
Dependent Claim
15 words
An artificial tooth as claimed in claim 1, said dental superstructure comprising a tooth crown.
Claim 4
Dependent Claim
19 words
An artificial tooth as claimed in claim 1, said dental superstructure comprising a fastening element for a dental bridge.
Claim 5
Dependent Claim
56 words
An artificial tooth as claimed in claim 1, said reabsorbable, bioreactive calciumphosphate being sintered and approximately uniformly embedded in the exterior region of said polymer matrix in the form of substantially spherically-shaped particles each having a diameter of between 0.2 to 1.5 mm, said thin porous layer of non-reabsorbable calciumphosphate being sintered and encompassing said particles.
Claim 6
Dependent Claim
19 words
An artificial tooth as claimed in claim 1, said reabsorbable calciumphosphate being tricalciumphosphate and said non-reabsorbable calciumphosphate being tetracalciumphosphate.
Claim 7
Dependent Claim
61 words
An artificial tooth as claimed in claim 4, said substantially spherical-shaped calciumphosphate particles being arranged only in the surface region of said tooth root and being cut along about one-fifth to one-half of their peripheral surfaces whereby the essentially non-reabsorbable calciumphosphate in the form of said porous particle layer coating is present only on the side facing towards said polymer matrix.
Claim 8
Dependent Claim
49 words
An artificial tooth as claimed in claim 4, comprising a finely dispersed filler material in said polymer matrix, said filler material in comparison to said embedded particles being constituted of sintered, reabsorbable tricalciumphosphate in a quantity of between 10 to 20 percent by weight relative to said polymer matrix.
Claim 9
Dependent Claim
25 words
An artificial tooth as claimed in claim 1, said polymer matrix of said tooth root being constituted of tissue-compatible methylmethacrylate, and copolymers, polyethylene, polypropylene, polyphenoloxide.
Claim 10
Dependent Claim
21 words
An artificial tooth as claimed in claim 1, said tooth root having a configuration in conformance with the available implantation space.
Claim 11
Dependent Claim
15 words
An artificial tooth as claimed in claim 9, said tooth root being rotationally symmetrically constructed.
Claim 12
Dependent Claim
21 words
An artificial tooth as claimed in claim 10, said tooth root being cylindrically and reducingly tapered towards the free end thereof.
Claim 13
Dependent Claim
21 words
An artificial tooth as claimed in claim 10, said tooth root being conically and reducingly tapered towards the free end thereof.
Claim 14
Dependent Claim
41 words
An artificial tooth as claimed in claim 10, said tooth root having an external form and dimension in conformance with the implantation support, said support being formed into the jawbone with the intermediary of a bone milling cutter and associated template.
Claim 15
Dependent Claim
47 words
An artificial tooth as claimed in claim 1, comprising a metal sleeve, said dental superstructure being seated on said sleeve; and elastic synthetic material filling said metal sleeve; and a connecting member detachably fastened to the core of said tooth root extending into said elastic synthetic material.
Claim 16
Dependent Claim
15 words
An artificial tooth as claimed in claim 14, said elastic synthetic material comprising silicon rubber.
Claim 17
Dependent Claim
15 words
An artificial tooth as claimed in claim 14, said connecting member comprising a threaded bolt.
Claim 18
Dependent Claim
49 words
An artificial tooth as claimed in claim 14, said intermediate member and the core of said tooth root being a unitary structure of a tissue-compatible metallic material; and an internal bore being formed in said intermediate member for receiving said connecting member and fastening thereto of said dental superstructure.
Claim 19
Dependent Claim
14 words
An artificial tooth as claimed in claim 17, said metallic material comprising clad metal.
Claim 20
Dependent Claim
14 words
An artificial tooth as claimed in claim 17, said metallic material comprising metal ceramic.
Claim 21
Dependent Claim
22 words
An artificial tooth as claimed in claim 1, said intermediate member comprising a disc-shaped member having a concavely curved peripheral edge structure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |