US5074792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthesis for devitalized tooth
Assignee: Individual
•
Filing: 1990-03-02
•
Granted: 1991-12-24
•
Expires: 2010-03-02
Abstract
Abstract A devitalized tooth having an outer surface at which opens a longitudinally extending and empty pulp cavity into which open transverse tubules is rebuilt by a prosthesis comprising a peg engaged with spacing in the cavity and having an outer end projecting from the cavity past the outer surface of the tooth, a prosthesis body adhered to the outer end of the peg, and a generally conical flexible and porous sheath formed of high-strength filaments surrounding the peg in the cavity. A solid mass formed of a durable resin that has a very low surface tension when liquid fills the cavity around the peg and the tubules. The sheath is wholly imbedded in the cavity in the mass.
Inventors
- 👤 Georges Bernadat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:47
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
120 words
For use with a devitalized tooth having an outer surface at which opens a longitudinally extending and empty pulp cavity into which open transverse tubules, a prosthesis comprising: a peg engaged with spacing in the cavity and having an outer end projecting from the cavity past the outer surface of the tooth; a prosthesis body adhered to the outer end of the peg; a generally conical flexible and porous sheath formed of high-strength filaments surrounding the peg in the cavity; and a solid mass formed of a durable resin that has a very low surface tension when in liquid form filling the cavity around the peg and the tubules, the sheath being wholly imbedded in the cavity in the mass.
Claim 2
Dependent Claim
120 words
For use with a devitalized tooth having an outer surface at which opens a longitudinally extending and empty pulp cavity into which open transverse tubules, a prosthesis comprising: a peg engaged with spacing in the cavity and having an outer end projecting from the cavity past the outer surface of the tooth; a prosthesis body adhered to the outer end of the peg; a generally conical flexible and porous sheath formed of high-strength filaments surrounding the peg in the cavity; and a solid mass formed of a durable resin that has a very low surface tension when in liquid form filling the cavity around the peg and the tubules, the sheath being wholly imbedded in the cavity in the mass.
Claim 3
Dependent Claim
14 words
The dental prosthesis defined in claim 1 wherein the sheath is a porous textile.
Claim 4
Dependent Claim
20 words
The dental prosthesis defined in claim 2 wherein the filaments of the sheath form a tail imbedded in the mass.
Claim 5
Dependent Claim
23 words
The dental prosthesis defined in claim 1, further comprising a reinforcing ring imbedded in the body around the outer end of the peg.
Claim 6
Dependent Claim
21 words
The dental prosthesis defined in claim 1 wherein the resin is of the type which hardens in the absence of air.
Claim 7
Dependent Claim
33 words
The dental prosthesis defined in claim 1 wherein the peg is formed by a plurality of like but separate tapered rods generally filling the sheath, the rods forming interstices filled by the mass.
Claim 8
Dependent Claim
20 words
The dental prosthesis defined in claim 6 wherein the rods taper at an apex angle of from 0.5° to 1.5°.
Claim 9
Dependent Claim
14 words
The dental prosthesis defined in claim 6 wherein the rods have a polygonal cross-section.
Claim 10
Dependent Claim
16 words
The dental prosthesis defined in claim 1 wherein the filaments are formed of an aromatic polyamide.
Claim 11
Dependent Claim
13 words
The dental prosthesis defined in claim 1 wherein the resin is methyl dimethacrylate.
Claim 12
Independent Claim
141 words
A method of making a prosthesis on a devitalized tooth having an outer surface at which opens a longitudinally extending and empty pulp cavity into which open transverse tubules, the method comprising the steps of: installing in the cavity a generally conical flexible and porous sheath formed of high-strength filaments; fitting in the sheath in the cavity a peg so that an outer end of the peg projects from the cavity past the outer surface of the tooth; filling the tubules and the cavity around the peg with a hardenable liquid resin of low surface tension so as to completely imbed the sheath in the cavity in the resin; hardening the resin into a solid mass in which the sheath is imbedded in the cavity in the mass; and forming a prosthesis body adhered to the outer end of the peg.
Claim 13
Independent Claim
141 words
A method of making a prosthesis on a devitalized tooth having an outer surface at which opens a longitudinally extending and empty pulp cavity into which open transverse tubules, the method comprising the steps of: installing in the cavity a generally conical flexible and porous sheath formed of high-strength filaments; fitting in the sheath in the cavity a peg so that an outer end of the peg projects from the cavity past the outer surface of the tooth; filling the tubules and the cavity around the peg with a hardenable liquid resin of low surface tension so as to completely imbed the sheath in the cavity in the resin; hardening the resin into a solid mass in which the sheath is imbedded in the cavity in the mass; and forming a prosthesis body adhered to the outer end of the peg.
Claim 14
Dependent Claim
29 words
The method defined in claim 11 wherein the peg is fitted in the cavity by inserting in the cavity pointed ends of a multiplicity of generally identical tapered rods.
Claim 15
Dependent Claim
31 words
The method defined in claim 11, further comprising the step of fitting a ring around the outer peg end before forming the prosthesis body and imbedding the ring in the body.
Claim 16
Dependent Claim
75 words
The method defined in claim 11 wherein the tubules and cavity are filled with the resin in two stages as follows: filling the tubules and lining the cavity with the hardenable liquid resin to form therein a resin lining prior to installing the porous sheath in the cavity; and filling the lined cavity around the sheath and peg with the resin after installing the sheath in the cavity and fitting the peg into the sheath.
References Cited (Backward Citations)
CA959312A
Cited
US4253835A
Cited
US4622012A
Cited
FR2588181A1
Cited
EP0299919A1
Cited
US4952150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |