Patent US4357136A successfully refreshed from Google Patents.
US4357136A
Expired / Lapsed
US
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Method for filling a root canal
Assignee: SOLAR ENERGY Tech Inc
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Filing: 1981-05-04
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Granted: 1982-11-02
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Expires: 2001-05-04
Abstract
Abstract A syringe for extruding heated thermoplastic materials through a hollow needle is disclosed. This syringe is particularly useful in obturating root canal cavities, or other dental cavities, with gutta-percha or similar materials.
Inventors
- 👤 Sheldon B. Herskovitz
- 👤 Jay Marlin
- 👤 Martin R. Stiglitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:22
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/50; A61C5/55
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A method filling dental root canal cavities with thermoplastic material comprising the steps of: providing a dental syringe having a chamber for holding a supply of thermoplastic material, a tubular needle, having a length of at least about one inch and an outer diameter within the range of diameters from that of an 18 gauge needle to that of a 30 gauge needle, fabricated from a material having high thermal conductivity of at least about 200 Btu/(hr.) (ft. 2 )(°F./ft.), an electric heater for heating the thermoplastic material and a plunger for pushing softened thermoplastic material through the needle; by means of the syringe heater, heating thermoplastic material within the syringe chamber and heating the needle to temperatures sufficient to soften the thermoplastic material and allow it to flow through the needle; positioning the needle in a dental cavity; pushing softened thermoplastic material through the needle into the dental cavity and thereby filling the cavity; and permitting the thermoplastic material within the dental cavity to cool and become a hardened mass.
Claim 2
Independent Claim
171 words
A method filling dental root canal cavities with thermoplastic material comprising the steps of: providing a dental syringe having a chamber for holding a supply of thermoplastic material, a tubular needle, having a length of at least about one inch and an outer diameter within the range of diameters from that of an 18 gauge needle to that of a 30 gauge needle, fabricated from a material having high thermal conductivity of at least about 200 Btu/(hr.) (ft. 2 )(°F./ft.), an electric heater for heating the thermoplastic material and a plunger for pushing softened thermoplastic material through the needle; by means of the syringe heater, heating thermoplastic material within the syringe chamber and heating the needle to temperatures sufficient to soften the thermoplastic material and allow it to flow through the needle; positioning the needle in a dental cavity; pushing softened thermoplastic material through the needle into the dental cavity and thereby filling the cavity; and permitting the thermoplastic material within the dental cavity to cool and become a hardened mass.
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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) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |