Patent US3925895A successfully refreshed from Google Patents.
US3925895A
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Hydrophilic root canal filling material
Assignee: National Patent Development Corp
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Filing: 1973-04-26
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Granted: 1975-12-16
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Expires: 1993-04-26
Abstract
Abstract Root canal therapy is carried out by forming a hydrophilic acrylate or methacrylate polymer in situ. Preferably a radiopaque material is included.
Inventors
- 👤 Karel Kliment
- 👤 Robert S Tu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:35
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/70; A61K6/71; A61K6/76; A61K6/60; A61K6/69; A61K6/77
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
78 words
A PROCESS COMPRISING FILLING A ROOT CANAL WITH A FLUID HYDROPHILIC POLYMERIZABLE MATERIAL CONSISTING ESSENTIALLY OF A MEMBER OF THE GROUP CONSISTING OF HYDROXY LOWER ALKYL ACRYLATES AND METHACRYLATES, HYDROXY LOWER ALKYL POLY(LOWER ACRYLATES AND METHACRYLATES, HYDROXY LOWER ALKYL POLY(LOWER ALKOXY) ACRYLATES AND METHACRYLATES, METHACRYLAMIDE, ACRYLAMIDE, N-LOWER ALKYL ACRYLAMIDES AND N-LOWER ALKYL METHACRYLAMIDES AND VINYL PYRROLIDONE, UP TO 25% OF AN ALKYL ACRYLATE OR METHACRYLATE AND 0.05 TO 5.0% OF A POLYETHYLENICALLY UNSATURATED MONOMER AS A CROSS-LINKING AGENT.
Claim 2
Dependent Claim
78 words
A PROCESS COMPRISING FILLING A ROOT CANAL WITH A FLUID HYDROPHILIC POLYMERIZABLE MATERIAL CONSISTING ESSENTIALLY OF A MEMBER OF THE GROUP CONSISTING OF HYDROXY LOWER ALKYL ACRYLATES AND METHACRYLATES, HYDROXY LOWER ALKYL POLY(LOWER ACRYLATES AND METHACRYLATES, HYDROXY LOWER ALKYL POLY(LOWER ALKOXY) ACRYLATES AND METHACRYLATES, METHACRYLAMIDE, ACRYLAMIDE, N-LOWER ALKYL ACRYLAMIDES AND N-LOWER ALKYL METHACRYLAMIDES AND VINYL PYRROLIDONE, UP TO 25% OF AN ALKYL ACRYLATE OR METHACRYLATE AND 0.05 TO 5.0% OF A POLYETHYLENICALLY UNSATURATED MONOMER AS A CROSS-LINKING AGENT.
Claim 3
Dependent Claim
26 words
A process according to claim 1 wherein the polymer composition formed in the root canal is swellable with hydration to between 5 and 25 volume percent.
Claim 4
Dependent Claim
20 words
A process according to claim 1 wherein the polymerizable material is injected as a flowable paste into the root canal.
Claim 5
Dependent Claim
21 words
A process according to claim 1 wherein the hydrophilic polymerizable material comprises hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate or hydroxypropyl methacrylate.
Claim 6
Dependent Claim
25 words
A process according to claim 4 wherein there is present a polyethylenically unsaturated monomer in an amount of 0.05 to 2% as a cross-linking agent.
Claim 7
Dependent Claim
14 words
A process according to claim 5 wherein a medicament is included in the composition.
Claim 8
Dependent Claim
15 words
A process according to claim 5 wherein a thixotropic filler is included in the composition.
Claim 9
Dependent Claim
15 words
A process according to claim 7 wherein a radiopaque material is included in the composition.
Claim 10
Dependent Claim
13 words
A process according to claim 5 wherein the polymerizable material comprises hydroxyethyl methacrylate.
Claim 11
Dependent Claim
18 words
A process according to claim 9 wherein 0.05-2% of ethylene glycol dimethacrylate is employed as a cross-linking agent.
Claim 12
Dependent Claim
15 words
A process according to claim 1 wherein a radiopaque material is included in the composition.
Claim 13
Dependent Claim
13 words
A process according to claim 11 wherein the radiopaque material is barium sulfate.
Claim 14
Dependent Claim
22 words
A process according to claim 11 wherein the polymerizable materials consist essentially of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate or hydroxypropyl methacrylate.
Claim 15
Dependent Claim
25 words
A process according to claim 13 wherein there is present a polyethylenically unsaturated monomer in an amount of 0.05 to 2% as a cross-linking agent.
Claim 16
Dependent Claim
82 words
A root canal of a tooth filled with a water insoluble hydrophilic polymer consisting essentially of a polymer of a member of the group consisting of hydroxy lower alkyl acrylates and methacrylates, hydroxy lower alkyl lower alkoxy acrylates and methacrylates, hydroxy lower alkyl poly(lower alkoxy) acrylates and methacrylates, methacrylamide, acrylamide, N-lower alkyl acrylamides and N-lower alkyl methacrylamides and vinyl pyrrolidone, up to 25% of an alkyl acrylate or methacrylate and 0.05 to 5.0% of a polyethylenically unsaturated monomer as a cross-linking agents.
Claim 17
Dependent Claim
82 words
A root canal of a tooth filled with a water insoluble hydrophilic polymer consisting essentially of a polymer of a member of the group consisting of hydroxy lower alkyl acrylates and methacrylates, hydroxy lower alkyl lower alkoxy acrylates and methacrylates, hydroxy lower alkyl poly(lower alkoxy) acrylates and methacrylates, methacrylamide, acrylamide, N-lower alkyl acrylamides and N-lower alkyl methacrylamides and vinyl pyrrolidone, up to 25% of an alkyl acrylate or methacrylate and 0.05 to 5.0% of a polyethylenically unsaturated monomer as a cross-linking agents.
Claim 18
Dependent Claim
22 words
A filled root canal according to claim 15 wherein the polymer is a polymer of a hydroxy lower alkyl acrylate or methacrylate.
Claim 19
Dependent Claim
17 words
A filled root canal according to claim 16 wherein the polymer is a polymer of hydroxyethyl methacrylate.
Claim 20
Dependent Claim
17 words
A filled root canal according to claim 16 wherein the polymer is a cross-linked water swellable polymer.
Claim 21
Dependent Claim
29 words
A filled root canal according to claim 16 wherein the polymer is swellable in the presence of moisture to the extent that the root canal cavity is permanently sealed.
Claim 22
Dependent Claim
15 words
A filled root canal according to claim 16 wherein the filling includes a radiopaque material.
Claim 23
Dependent Claim
13 words
A filled root canal according to claim 20 wherein the filling includes silica.
Claim 24
Dependent Claim
15 words
A filled root canal according to claim 20 wherein the radiopaque material is barium sulfate.
Claim 25
Dependent Claim
15 words
A filled root canal according to claim 15, wherein the filling includes a radiopaque material.
Claim 26
Dependent Claim
26 words
A filled root canal according to claim 23 wherein the polymer consists essentially of a polymer of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate or hydrOxypropyl methacrylate.
Claim 27
Dependent Claim
25 words
A process according to claim 24, wherein there is present a polyethylenically unsaturated monomer in an amount of 0.05 to 2% as a cross-linking agent.
Claim 28
Dependent Claim
29 words
A composition comprising hydroxy lower alkyl acrylate or methacrylate and bismuth subcarbonate in an amount sufficient to act as a radiopaque material upon polymerization of the acrylate or methacrylate.
Claim 29
Dependent Claim
29 words
A composition comprising hydroxy lower alkyl acrylate or methacrylate and bismuth subcarbonate in an amount sufficient to act as a radiopaque material upon polymerization of the acrylate or methacrylate.
Claim 30
Dependent Claim
12 words
A composition according to claim 26 in the form of a paste.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |