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Publication numberUS322265 A
Publication typeGrant
Publication dateJul 14, 1885
Publication numberUS 322265 A, US 322265A, US-A-322265, US322265 A, US322265A
InventorsEobeet B. Donaldson
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
donaldson
US 322265 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

(No Model.) Y R.B. DONALDSON.

DENTAL INSTRUMENT.

Patented July 14,1885- WITNBSSES:

f ATTORNEY 'ROBERT B. DONALDSON, WASHINGTON, DISTRICT OF COLUMBIA.

DENTAL INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 322,265, dated July 14, 1885.

' Application mm1 May 5, isst. (No model.)

To a/ZZ whom it may concern:

Be it known that I, ROBERT BRUCE DON- ALDsoN, of Washington, in the District of Columbia, have invented a new and useful Improvement in Dental Instrument-srand I do declare that the following is a full andaccurate description of the same, reference being had to the accompanying drawings, wherein- Figure 1 is a perspective view of my instrument greatly enlarged. Fig. 2 represents the same operative size. Fig. 3 represents the same operative size bent to illustrate how it `may be prepared for use.

scrape and cleanse the walls of the canal.l

These instruments are generally made by the dentist himself, the barbs being formed by a knife or ne file. The action of such an instrument is irregular and uncertain, and the barbs frequently break off in the canal and are difficult to remove. To remove as far as possible the liability of breaking, the instrument is generally made from untempered metal, and this detracts from the efficiency.

My invention consists of an instrument, which I prefer to make from piano-wire, reduced at the point to a requisite size to enter the nerve-canal, and provided at and near its point with a series of scraping-teeth, projecting in all directions, and preferably arranged in a spiral line around kthe shaft of the instrument.

In the drawings, A is the shaft of the instrument, about two and a half inches in length, and provided with a suitable handle, B. Piano -wire has a temper admirably adapted for instruments of this description.

It is sufficiently hard for all purposes, yet i is tough and iieXible, and will bear repeated bendings. I therefore prefer to make the shaft from steel piano-wire of proper gage,

reduced toward its extremity to the proper" I then make a series.

degree of attenuation. y of cuts, d, inclined to the axis of the shaft A, which separate portions of the metal of said shaft and bend it outwardly, as shown; and

other from that accidentally too deep penei w tration which causes the barb of the ordinary y instrument to be broken off.

I prefer to arrange the Scrapers e in a 'will canse the instrument to embed itself,

and thereby'render the removal of the nerve substance comparatively easy.

Having described my invention, I claim as newl. A dental instrument for scraping and cleaning the nerve-canal in the root of a tooth, consisting of a substantially rigid shaft, A, provided on all sides with a series of inclined cuts, d, and projecting Scrapers e, substantially as set forth.

2. A dental instrument for scraping and cleaning the nerve-canal in the root of a tooth, consisting of a substantially rigid shaft,

A, provided with aseries of cuts, d, and resultant Scrapers c, inclined to the axis of said shaft and arranged on a spiral line around the same.

3. A dental instrument for scraping and cleaning the nerve-canal of a tooth, consisting of a substantially rigid shaft, A, of steel y piano-wire,'reduced to the desired attenuation toward thepoint, and provided with a series of inclined cuts, d, and projecting Scrapers e, substantially as set forth.

ROBERT DONALDSON.

Witnesses:

JAMEs I. STABLER, ALBERT G. HALL.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4824370 *Aug 25, 1988Apr 25, 1989Micro-MegaDental drill
US4889487 *Nov 23, 1988Dec 26, 1989Lovaas Leeland MEndodontic files
US5320530 *Dec 17, 1992Jun 14, 1994Fong Cheng DEndodontic apparatus for retrofill cavity preparation
US5642998 *Jun 6, 1996Jul 1, 1997Riitano; FrancescoEndodontic instrument for rapid mechanical widening of the canal mouth and specific rectification of the first two thirds
US5775904 *Jun 30, 1997Jul 7, 1998Ultradent Products, Inc.Endodontic instrument for rapid mechanical widening of the canal mouth and specification of the first two thirds
US5857852 *Nov 19, 1997Jan 12, 1999The Kerr CorporationEndodontic file with non-helical flutes
US6042375 *Jan 28, 1998Mar 28, 2000Ultradent Products, Inc.Endodontic systems for progressively, sectionally and anatomically preparing root canals with specific instruments for each section having predetermined working lengths
US6045362 *Jan 28, 1998Apr 4, 2000Ultradent Products, Inc.Endodontic methods for progressively, sectionally and anatomically preparing root canals with specific instruments for each section having predetermined working lengths
US6059572 *Jun 3, 1999May 9, 2000Ultradent Products, Inc.Endodontic methods for the anatomical, sectional and progressive corono-apical preparation of root canals with three sets of dedicated instruments
US6379155Mar 27, 2000Apr 30, 2002Ultradent Products, Inc.Endodontic systems and methods for the anatomical, sectional and progressive corono-apical preparation of root canals with instruments utilizing stops
US6390819Jan 3, 2001May 21, 2002Ultradent Products, Inc.Endodontic systems and methods for the anatomical, sectional and progressive corono-apical preparation of root canals with dedicated stainless steel instruments and dedicated nickel/titanium instruments
US6558163May 3, 2001May 6, 2003Ultradent Products, Inc.Endodontic systems and methods for preparing upper portions of root canals with increasingly rigid files
US6585513May 3, 2001Jul 1, 2003Ultradent Products, Inc.Endodontic systems and methods for preparing apical portions of root canals with a set of files having large tapers
US6746245Feb 21, 2002Jun 8, 2004Ultradent Products, Inc.Methods for cleaning and shaping asymmetrical root canals in an anatomical fashion
US7018205 *May 10, 2002Mar 28, 2006Abelity, LlcBarbed endodontic instrument
US20030211442 *May 10, 2002Nov 13, 2003Michael AbelBarbed endodontic instrument
Classifications
Cooperative ClassificationA61C5/023