Patent US4731020A successfully refreshed from Google Patents.
US4731020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable denture retaining structure
Assignee: Nippon Mektron KK
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Filing: 1986-07-24
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Granted: 1988-03-15
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Expires: 2006-07-24
Abstract
Abstract The specification discloses a removable denture retaining structure in which an elastic mounting member is provided between a denture body and an support base. This structure can obviate all problems of the prior art, i.e. many parts are required, skilled technique is also required to produce, mount and dismount the denture body, and looseness and breakage due to fatigue are apt to occur. Furthermore, the invention is advantageous because the structure can provide patients with comfortable feeling during use.
Inventors
- 👤 Haruyuki Kawahara
- 👤 Hiroki Wada
- 👤 Takashi Tsutsumi
- 👤 Ikuya Matsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:47
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/265; A61C13/2656; A61C13/30; A61C8/00; A61C8/0086
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
A removable denture retaining structure including a support base and denture body, said removable denture retaining structure being characterized in that said denture body is integrated with an elastic mounting member which is made from any of polyurethane rubber, segmented polyurethane rubber and composite materials of these rubber materials and has at least the physical characteristics of the modulus of elasticity of 10 to 10,000 kg/cm 2 , a coefficient of friction of 0.03 to 1.8 and a compression ratio of 0.32 to 0.50, and said elastic mounting member is removably pressure-fitted to said support base to elastically be in frictional contact therewith, so that said denture body does not float from or sink in said support base during normal biting motion, and so that said denture body can be removed from said support base when a great external force different from the biting force is applied to remove said denture body by compressing to deform said elastic mounting member.
Claim 2
Dependent Claim
160 words
A removable denture retaining structure including a support base and denture body, said removable denture retaining structure being characterized in that said denture body is integrated with an elastic mounting member which is made from any of polyurethane rubber, segmented polyurethane rubber and composite materials of these rubber materials and has at least the physical characteristics of the modulus of elasticity of 10 to 10,000 kg/cm 2 , a coefficient of friction of 0.03 to 1.8 and a compression ratio of 0.32 to 0.50, and said elastic mounting member is removably pressure-fitted to said support base to elastically be in frictional contact therewith, so that said denture body does not float from or sink in said support base during normal biting motion, and so that said denture body can be removed from said support base when a great external force different from the biting force is applied to remove said denture body by compressing to deform said elastic mounting member.
Claim 3
Dependent Claim
31 words
A removable denture retaining structure as claimed in claim 1, wherein said support base is a natural abutment tooth and an inner crown and said denture body is an outer crown.
Claim 4
Dependent Claim
24 words
A removable denture retaining structure as claimed in claim 2, wherein said elastic mounting member is a ring belt buried inside said outer crown.
Claim 5
Dependent Claim
23 words
A removable denture retaining structure as claimed in claim 2, wherein said elastic mounting member is a cap provided inside said outer crown.
Claim 6
Dependent Claim
39 words
A removable denture retaining structure as claimed in claim 4, wherein said cap is a low-foamed substance made of a material selected from the group consisting of polyurethane rubber, segment polyurethane rubber and composite materials of these rubber materials.
Claim 7
Dependent Claim
43 words
A removable denture retaining structure as claimed in claim 1, wherein said elastic mounting member is two hat-shaped caps provided in said bridge, and each of said caps is placed over a post projected from the corresponding outer surface of said bridge retainer.
Claim 8
Dependent Claim
48 words
A removable denture retaining structure as claimed in claim 1, wherein said support base is a natural abutment tooth and two implant members, said denture body is a bridge, and said elastic mounting member is two hat-shaped caps provided in said bridge placed over said two implant members.
Claim 9
Dependent Claim
22 words
A removable denture retaining structure as claimed in claim 1, wherein said elastic mounting member is a lower part of a bridge.
References Cited (Backward Citations)
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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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |