US4872839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spacer for dental implants
Assignee: Nobel Biocare AB
•
Filing: 1988-05-18
•
Granted: 1989-10-10
•
Expires: 2008-05-18
Abstract
Abstract The disclosure relates to a spacer for dental implants of a bio-compatible material. The spacer includes an inner sleeve-shaped spacer element (4) of titanium which is part of a screw connection between an anchorage element (fixture) (1) implanted in the maxillary beneath the gingiva, and a dental prosthesis construction whose joint surface (11) is located above the gingiva and which is disposed to absorb the loading of the screw connection. The spacer further includes an outer spacer sleeve (12) of porcelain or ceramics which wholly or partly encloses the inner sleeve-like spacer element (4). The ceramic or porcelain sleeve may, by grinding and coating with porcelain of different colours, be caused to visually approximate a dental cervix and gingiva and, thereby, not contrast with the natural dental cervix colour and gingival colour to the same extent as does the titanium material.
Inventors
- 👤 Izidor Brajnovic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:01
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0048; A61C8/005; A61C8/0054; A61C8/0057; A61C8/0069
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
160 words
A spacer for dental implants constituting a connection element in a removable screw connection between an anchorage element implanted in the maxillary beneath the gingiva, and a dental prosthesis construction whose joint surface is disposed above the gingiva, said spacer comprising: a tubular spacer member made of a bio-compatible material such as titanium for absorbing the loadings of the screw connection; said tubular spacer element having a lower, substantially conically tapered portion for gingival penetration and an upper cylindrical portion projecting above the gingival edge and extending from said conically tapered portion up to the joint surface of the prosthesis construction; the outer diameter of the lower end part of said conically tapered portion substantially corresponding to the outer diameter of the upper portion of the anchorage element; a covering sleeve of a tooth-like material provided substantially around said cylindrical portion of the spacer element; and wherein said covering sleeve is not subjected to any loadings of the screw connection.
Claim 2
Dependent Claim
160 words
A spacer for dental implants constituting a connection element in a removable screw connection between an anchorage element implanted in the maxillary beneath the gingiva, and a dental prosthesis construction whose joint surface is disposed above the gingiva, said spacer comprising: a tubular spacer member made of a bio-compatible material such as titanium for absorbing the loadings of the screw connection; said tubular spacer element having a lower, substantially conically tapered portion for gingival penetration and an upper cylindrical portion projecting above the gingival edge and extending from said conically tapered portion up to the joint surface of the prosthesis construction; the outer diameter of the lower end part of said conically tapered portion substantially corresponding to the outer diameter of the upper portion of the anchorage element; a covering sleeve of a tooth-like material provided substantially around said cylindrical portion of the spacer element; and wherein said covering sleeve is not subjected to any loadings of the screw connection.
Claim 3
Dependent Claim
18 words
The spacer as claimed in claim 1, wherein said covering sleeve is made of a porcelain or ceramics.
Claim 4
Dependent Claim
48 words
The spacer as claimed in claim 1, wherein said cylindrical portion of said tubular spacer element has an outer milled recess for receiving said covering sleeve, the outer contour of said sleeve at the lower edge of said milled recess following the outer contour of said spacer element.
Claim 5
Dependent Claim
30 words
The spacer as claimed in claim 1, wherein said covering sleeve includes an inner cylinder made of gold or aluminum oxide against which a porcelain or ceramics has been applied.
Claim 6
Dependent Claim
36 words
The spacer as claimed in claim 1, wherein said spacer element is disposed at an angle with respect to said anchorage element, said covering sleeve constituting a seal against the screw passage in said spacer element.
Claim 7
Dependent Claim
36 words
The spacer as claimed in claim 4, wherein said spacer element is disposed at an angle with respect to said anchorage element, said covering sleeve constituting a seal against the screw passage in said spacer element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |