US4738622A
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: 1988-04-19
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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 a 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
2026-10-24 22:29
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/265; A61C13/2656; A61C13/30; A61C8/00; A61C8/0086
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
172 words
A removable denture retaining structure including a support base and a 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, segment 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 050, and said elastic mounting member is removably pressure-fitted to said support base to elastically be in frictional contact therewith and to be in mechanical engagement therewith in an upward direction, so that said denture body does not float from or sink into 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 the denture body by compressing to deform said elastic mounting member.
Claim 2
Dependent Claim
172 words
A removable denture retaining structure including a support base and a 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, segment 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 050, and said elastic mounting member is removably pressure-fitted to said support base to elastically be in frictional contact therewith and to be in mechanical engagement therewith in an upward direction, so that said denture body does not float from or sink into 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 the denture body by compressing to deform said elastic mounting member.
Claim 3
Dependent Claim
34 words
A removable denture structure as claimed in claim 1, wherein said support base is a natural abutment tooth and a metallic post and said denture body is a crown placed over said support base.
Claim 4
Dependent Claim
32 words
A removable denture retaining structure as claimed in claim 2, wherein said elastic mounting member comprises said post set into said tooth and a trapezoidal cap which is placed over said post.
Claim 5
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 6
Dependent Claim
24 words
A removable denture retaining structure as claimed in claim 4, wherein said elastic mounting member is a ring belt buried inside said outer crown.
Claim 7
Dependent Claim
23 words
A removable denture retaining structur as claimed in claim 4, wherein said elastic mounting member is a cap provided inside said outer crown.
Claim 8
Dependent Claim
39 words
A removable denture retaining structure as claimed in claim 6, 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 9
Dependent Claim
51 words
A removable denture retaining structure as claimed in claim 1, wherein a notch projected to the inner surface of said outer crown function as said elastic mounting member and the tip end of said notch is elastically fit in a recess provided on the outer side surface of said inner crown.
Claim 10
Dependent Claim
30 words
A removable denture retaining structure as claimed in claim 1, wherein said support base is two natural abutment teeth and two bridge retainers and said denture body is a bridge.
Claim 11
Dependent Claim
46 words
A removable denture retaining structure as claimed in claim 9, wherein two notches projected from said bridge function as said elastic mounting members and each tip end of said notch is mechanically engaged with a recess provided on the outer side surface of said bridge retainer.
Claim 12
Dependent Claim
45 words
A removable denture retaining structure as claimed in claim 9, 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 each of said bridge retainer.
Claim 13
Dependent Claim
65 words
A removable denture retaining structure as claimed in claim 1, wherein a metallic rest of a bridge is stretched between and engages with two support bases, a lower part of said bridge is provided under said rest and separated from said support bases via pockets, and elastic mounting members of a wedge shape are provided in said pockets and mechanically engaged with said support bases.
Claim 14
Dependent Claim
50 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 which are placed over said two implant members.
Claim 15
Dependent Claim
22 words
A removable denture retaining structure as claimed in claim 1, wherein said elastic mounting member is a lower part of said bridge.
References Cited (Backward Citations)
US2036678A
Cited
US3958334A
Cited
US4014095A
Cited
US3934347A
Cited
US4204321A
Cited
US4215986A
Cited
US4324549A
Cited
US4318696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |