US4850869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable dental prosthesis
Assignee: Fried Krupp AG
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Filing: 1986-09-26
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Granted: 1989-07-25
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Expires: 2006-09-26
Abstract
Abstract A dental prosthesis including a secondary member coupled to at least one prosthetic tooth suitable for being effectively mounted onto or readily removed from a primary member coupled to a remaining tooth or implant. A bar member is accommodated inside a common bore in the primary and secondary members for coupling thereof. An arresting disc member is introduced into a recess inside the prosthetic toth to block off a leading shaft portion of the bar member having the largest cross-section and preventing the bar member from falling out. The entire bar member is suitable for freely moving along the bores of the primary and secondary members. Between an intermediate portion of the bar member and the recess inside the prosthetic tooth is a space which is filled with plastic material. A trailing head portion of the bar member is ground off to correspond with the buccal exterior surface of the prosthetic tooth.
Inventors
- 👤 Peter Steinfort
- 👤 Gilbert Weis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:50
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/273; A61C13/0003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
247 words
In a dental prosthesis comprising: a primary member permanently connectable to a supporting dental structure in the mouth of a patient, said primary member being provided with a bore; a secondary member connected to said primary member, said secondary member having an opening and a recess which are located at opposite sides of said primary member and are aligned with said bore; a prosthetic tooth having buccal and lingual surfaces and fastened to said secondary member, said tooth having a passage aligned with said opening in said secondary member and extending from said buccal surface; a slide bar having leading and trailing ends and an intermediate position disposed between said ends, said slide bar being disposed through said passage in said tooth, said opening in said secondary member and said bore in said primary member, with said leading end seated in said recess in said secondary member and said trailing end being in the vicinity of said buccal surface of said tooth, thereby connecting said secondary member and said primary member together; and an arresting and bearing disc secured to said slide bar and embedded in said tooth, the improvement wherein: a part of said slide bar in said tooth and at least one of said bore, said passage and said opening have nonrotationally symmetrical cross sections, which prevent rotation of said slide bar relative to said primary member; and said trailing end of said slide bar is substantially flush with said buccal surface of said tooth.
Claim 2
Dependent Claim
247 words
In a dental prosthesis comprising: a primary member permanently connectable to a supporting dental structure in the mouth of a patient, said primary member being provided with a bore; a secondary member connected to said primary member, said secondary member having an opening and a recess which are located at opposite sides of said primary member and are aligned with said bore; a prosthetic tooth having buccal and lingual surfaces and fastened to said secondary member, said tooth having a passage aligned with said opening in said secondary member and extending from said buccal surface; a slide bar having leading and trailing ends and an intermediate position disposed between said ends, said slide bar being disposed through said passage in said tooth, said opening in said secondary member and said bore in said primary member, with said leading end seated in said recess in said secondary member and said trailing end being in the vicinity of said buccal surface of said tooth, thereby connecting said secondary member and said primary member together; and an arresting and bearing disc secured to said slide bar and embedded in said tooth, the improvement wherein: a part of said slide bar in said tooth and at least one of said bore, said passage and said opening have nonrotationally symmetrical cross sections, which prevent rotation of said slide bar relative to said primary member; and said trailing end of said slide bar is substantially flush with said buccal surface of said tooth.
Claim 3
Dependent Claim
23 words
Dental prosthesis as defined in claim 1 wherein said bore in said primary member has a maximum diameter of 1.3 to 1.5 mm.
Claim 4
Dependent Claim
77 words
Dental prosthesis as defined in claim 1 wherein said primary member has the form of a bar with lower and upper ends which, are directed, respectively, toward the gingiva of the patient and the crown of the tooth, and lateral sides extending between the upper and lower ends, and said bore is located in the lower third of said primary member, in the direction between said upper and lower ends, and adjacent one of said lateral sides.
Claim 5
Dependent Claim
46 words
Dental prosthesis as defined in claim 1 wherein said primary member has lower and upper ends which, are directed, respectively, toward the gingiva of the patient and the crown of the tooth, and said primary member is tapered from said lower end toward said upper end.
Claim 6
Dependent Claim
21 words
The dental prosthesis apparatus of claim 1 wherein said primary member and said secondary member are made of non-noble metal alloys.
Claim 7
Dependent Claim
79 words
The dental prosthesis apparatus of claim 1 wherein said primary member is composed of an alloy which comprises between 0.4 and 0.5% C, between 0.7 and 1.0% Si, 1% Mn, between 27 and 30% Cr, between 4.5 and 5.0% Mo, 0.5% W, no more than 1.0% Fe, and remainder Co, and said secondary member is composed of an alloy which comprises between 15 and 25% Cr, between 3 and 6% Mo, between 2 and 5% Ti, and remainder Co.
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) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |