US4552531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gauged root canal condenser spreader
Assignee: Individual
•
Filing: 1984-11-16
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Granted: 1985-11-12
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Expires: 2004-11-16
Abstract
Abstract The invention is an improved dental instrument for root canal dental treatment. The improved instrument is a combined root canal condenser and spreader instrument which makes it possible for the dentist to do the treatment work with one instrument instead of constantly changing back and forth between two instruments. In addition, the combined instrument uses a common handle with removable and replaceable working ends of the instrument when different sizes of instruments are required for the tooth being treated or for the stage at which the tooth is being treated. The removable and replaceable working ends of the instrument are gauged marked so that the dentist can gauge the depth at which the dental work must be done and at which the following stages of the work are being done in order to assure a fully spread and condensed dental material in the tooth. The gauged root canal condenser spreader consists of a handle member, a removable and replaceable condenser instrument end or tip, a removable and replaceable spreader instrument end, and easily visable gauge markings on each of the removable and replaceable condenser and spreader instrument ends, respectively.
Inventors
- 👤 Howard Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:07
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/40; A61C5/42; A61C5/44; Y; Y10; Y10S; Y10S40/00; Y10S40/913
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
432 words
A dental instrument for root canal work, comprising: a handle, said handle having geometrically configured socket-like cavities in each end thereof, said handle being elongated and rod-like in configuration and having suitable knurling on the outside surface thereof; a first dental instrument component, said first dental instrument component having a capability for performing dental condensing operations in prepared root canals of teeth, said first dental instrument component having a first end and a second end, said first end of said first dental instrument component being geometrically configured into a shaft-like coupling end, said geometrically configured shaft-like coupling end being so sized and configured so as to be removably inserted into one of said geometrically configured socket-like cavities in said handle by a snap fit, said second end of said first dental instrument component being configured into a tapered condenser portion to perform said condensing operations in said prepared root canals, said first dental instrument component between said geometrically configured shaft-like coupling end and said tapered condenser portion thereof has a short body member portion, a tapered transition portion, and a bend portion, in that sequence, said geometrically configured shaft-like coupling end, said short body portion, said tapered transition portion, said bend portion, and said tapered condenser portion all being integral and monolithic in that sequence; a second dental instrument component, said second dental instrument component having a capability for performing dental spreader operations in prepared root canals of teeth, said second dental instrument component having a first end and a second end, said first end of said second dental instrument component being geometrically configured into a shaft-like coupling end, said geometrically configured shaft-like coupling end being so sized and configured so as to be removably inserted into the other of said geometrically configured socket-like cavities in said handle by a snap-fit, said second end of said second dental instrument component being configured into a tapered portion to perform said spreader operations in said root canals, said second dental instrument component between said geometrically configured shaft-like coupling end and said tapered spreader portion thereof has a short body member portion, a tapered transition portion, and a bend portion, in that sequence, said geometrically configured shaft-like coupling end, said short body portion, said tapered transition portion, said bend portion, and said tapered spreader portion all being integral and monolithic in that sequence; and a plurality of color code markings, said plurality of color code markings being applied to said second end of said first and second dental instrument components, respectively, to indicate matching pairs and size and depth measurements in said prepared root canals.
Claim 2
Dependent Claim
432 words
A dental instrument for root canal work, comprising: a handle, said handle having geometrically configured socket-like cavities in each end thereof, said handle being elongated and rod-like in configuration and having suitable knurling on the outside surface thereof; a first dental instrument component, said first dental instrument component having a capability for performing dental condensing operations in prepared root canals of teeth, said first dental instrument component having a first end and a second end, said first end of said first dental instrument component being geometrically configured into a shaft-like coupling end, said geometrically configured shaft-like coupling end being so sized and configured so as to be removably inserted into one of said geometrically configured socket-like cavities in said handle by a snap fit, said second end of said first dental instrument component being configured into a tapered condenser portion to perform said condensing operations in said prepared root canals, said first dental instrument component between said geometrically configured shaft-like coupling end and said tapered condenser portion thereof has a short body member portion, a tapered transition portion, and a bend portion, in that sequence, said geometrically configured shaft-like coupling end, said short body portion, said tapered transition portion, said bend portion, and said tapered condenser portion all being integral and monolithic in that sequence; a second dental instrument component, said second dental instrument component having a capability for performing dental spreader operations in prepared root canals of teeth, said second dental instrument component having a first end and a second end, said first end of said second dental instrument component being geometrically configured into a shaft-like coupling end, said geometrically configured shaft-like coupling end being so sized and configured so as to be removably inserted into the other of said geometrically configured socket-like cavities in said handle by a snap-fit, said second end of said second dental instrument component being configured into a tapered portion to perform said spreader operations in said root canals, said second dental instrument component between said geometrically configured shaft-like coupling end and said tapered spreader portion thereof has a short body member portion, a tapered transition portion, and a bend portion, in that sequence, said geometrically configured shaft-like coupling end, said short body portion, said tapered transition portion, said bend portion, and said tapered spreader portion all being integral and monolithic in that sequence; and a plurality of color code markings, said plurality of color code markings being applied to said second end of said first and second dental instrument components, respectively, to indicate matching pairs and size and depth measurements in said prepared root canals.
Claim 3
Dependent Claim
28 words
A dental instrument as recited in claim 1, wherein the distal end of said second end of said first dental intrument component is flat and blunt-like in configuration.
Claim 4
Dependent Claim
26 words
A dental instrument as recited in claim 1, wherein the distal end of said second end of said first dental instrument component is rounded in configuration.
Claim 5
Dependent Claim
24 words
A dental instrument as recited in claim 1, wherein the distal end of said second end of said second dental instrument component is pointed.
Claim 6
Dependent Claim
39 words
A dental instrument as recited in claim 1, wherein each code marking of said plurality of code markings are each band-like and encircle said tapered portion of said second ends of said first and second dental instrument components, respectively.
Claim 7
Dependent Claim
129 words
A dental instrument as recited in claim 1, wherein said plurality of code markings are applied to said second end of said first and second dental instruments, respectfully, to indicate sizes in accordance with the following table: ______________________________________
COLOR CODING
Size Tip End Tip Top
Color Numeral Dimension Dimension
______________________________________
White 15 0.15 mm 0.47 mm
Yellow 20 0.20 mm 0.52 mm
Red 25 0.25 mm 0.57 mm
Blue 30 0.30 mm 0.62 mm
Green 35 0.35 mm 0.67 mm
Black 40 0.40 mm 0.72 mm
White 45 0.45 mm 0.77 mm
Yellow 50 0.50 mm 0.82 mm
Blue 60 0.60 mm 0.92 mm
Green 70 0.70 mm 1.02 mm
Black 80 0.80 mm 1.12 mm
Green 90 0.90 mm 1.22 mm
White 100 1.00 mm 1.32 mm
______________________________________
Claim 8
Dependent Claim
52 words
A dental instrument as recited in claim 6 and additionally, a code numeral, said code numeral being the same as said size numeral for each said color code, said code numeral being placed upon said handle component to differentiate the sizes where said color code color is repeated in the large sizes.
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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) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |