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Publication numberUS1307446 A
Publication typeGrant
Publication dateJun 24, 1919
Filing dateApr 24, 1915
Publication numberUS 1307446 A, US 1307446A, US-A-1307446, US1307446 A, US1307446A
InventorsM. Kerb
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Mathew m
US 1307446 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

M. M. KERR.

DENTAL INSTRUMENT.

APPLICATION FILED APH. 24. 1915.

1,307,446. v n Patented June 24, i919.

Tlgl- I i Tfg.

jm W7 l mmm IINITED STATES PATENT OFFICE.

MATHEW M. KEER, OF DETROIT, MICHIGAN, ASSIGNOR TO DETROIT DENTAL MANU- FACTURING COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

DENTAL INSTRUMENT.

Specication of Letters Patent.

Patented J une 24, 1919.

To all whom t may concern.'

Be it known that I, MA'rHEw M. KERR, a citizen of the United States of America, residing at Detroit, in the county of lVayne and State of Michigan, have invented certain new .and useful Improvements in Dental Instruments, of which the following is a specification, reference being` had therein to the accompanying drawings.

The invention relates to dental tools which are designed for use in clearing out the nerve canals in devitalized teeth. Such instruments are usually in the form of reamers which are sufficiently flexible to follow the curves of the canals and operate by a rotary movement in said canals.

It is the object of the present invention to form a broach which, instead of operating as a reamer, may be used as a file, performing its work when longitudinally reciprocated.

In the drawings:

Figure 1 is a magnified elevation of the broach;

Figs. 2 and 3 are cross sections on line and y-y Fig. l; and

Fig. 4 is a longitudinal section.

In the present state of the art dental tools of thischaracter are usually formed of fine steel rods or needles, which are ground into a polygonal and pointed form and are then twisted to give a slightly spiral form to the cutting edge. The pitch of the spiral is, however, such that the general direction is longitudinal of the needle, and, as before stated, in operation the tool must be rotated to perform its work. In my improved construction, the polygonal rod is twisted to such an extent, or otherwise so fashioned, that the cutting edge extends transverse to the longitudinal axis, and at such an angle that the work will be performed by a longitudinal reciprocating movement instead of a rotary movement.

As specifically shown, A is the round rod, which is ground with polygonal faces B forming cutting angles C. These angles or cutting edges, when the rod is twisted, will form spirals D of relatively flat pitch, while at the point the cutting edges extend longitudinally, as at E, to form a reamer.

In use, the tool when inserted in a nerve canal is moved longitudinally, causing the transverse cutting edges D to operate as files. This instrument is particularly useful where the canal is not round in cross section, as the cut is not produced by a rotary motion.

The cutting edges are preferably formed with a sharper angle on the upper side than that upon the lower side, so that the cutting will be effected on the outward pull instead of upon the inward push of the instrument.

This is advantageous, as the small size and' flexibility of the rod would endanger breaking if the work were performed by a pushing movement.

Ihat I claim as my invention is l. A dental instrument comprising a rod provided with ground polygonal faces forming cutting edges, said rod having the cutting edges at one en-d tapering to a point and extending substantially longitudinally thereof, and said rod being twisted to form spirals of relatively flat pitch, the cutting edges of the spirals having a sharper angle on the side opposite the point than the cutting edges on the same side with the point.

2. A dental instrument, comprising a polygonal rod twisted to form a spiral cutting ,edge at an angle to effect cutting when moved longitudinally of the axis of the rod.

3. A dental instrument, comprising a rod having a spirally twisted cutting edge, the pitch of the spiral being such as to effect a cutting operation when reciprooated longitudinally of the axis of the rod.

4. A dental instrument, having a point portion with longitudinally-extending cutting edges and a portion having a spirallytwisted cutting edge, the pitch of the spiral being such as to effect a cutting operation when reciprocated longitudinally of the axis of the rod.

In testimony whereof I affix my signature in presence of two witnesses.

MATHEW M. KERR.

Witnesses EDWIN HERZOG, K. CARLYLE.

Copies of this patent may be obtained for ve cents each, by addressing the- Commissioner of Patents. Washington, I). C.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4260379 *May 17, 1979Apr 7, 1981Sybron CorporationEndodontic instrument
US4268253 *Dec 26, 1979May 19, 1981Gross Michael JDowel post for dental and medical prosthetic devices
US4332561 *May 14, 1981Jun 1, 1982Inventive Technology International, Inc.Dental file
US4353698 *Aug 27, 1981Oct 12, 1982Inventive Technology International, Inc.Dental tool
US4443193 *Feb 8, 1983Apr 17, 1984Roane James BEndodontic instrument
US4457710 *Nov 9, 1981Jul 3, 1984Inventive Technology InternationalDental instrument
US4536159 *Jan 24, 1984Aug 20, 1985Roane James BEndodontic instrument
US4538989 *Sep 16, 1980Sep 3, 1985Dentsply International, Inc.Dental reamer
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US4661061 *Jul 22, 1985Apr 28, 1987Howard MartinFour sided root canal rasp for root canal preparation
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US5882198 *Jun 30, 1997Mar 16, 1999Ormco CorporationEndodontic instrument having enhanced compliance at the tip
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US5902106 *Apr 7, 1998May 11, 1999Ormco CorporationEndodontic dental instrument
US5921775 *May 24, 1996Jul 13, 1999Buchanan; Leonard StephenEndodontic treatment system
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US6419488Apr 24, 1996Jul 16, 2002Ormco CorporationEndodontic instrument having a chisel tip
US7311522Oct 13, 2004Dec 25, 2007Miltex Technology CorporationEndodontic instruments and method of manufacturing same
US7967605Mar 16, 2005Jun 28, 2011Guidance Endodontics, LlcEndodontic files and obturator devices and methods of manufacturing same
US8714978Oct 6, 2011May 6, 2014Dentsply International Inc.Endodontic system and method
USRE34439 *Mar 13, 1991Nov 9, 1993Heath Derek EDental compactor instrument
USRE39174 *Apr 26, 2001Jul 11, 2006Leonard Stephen BuchananEndodontic treatment system
WO1979000344A1 *Nov 29, 1978Jun 28, 1979G EklundRoot canal file and method of manufacturing it
WO1982003978A1 *Jul 30, 1981Nov 25, 1982Inventive Tech IntDental file
WO1983001565A1 *Sep 29, 1982May 11, 1983Inventive Tech IntDental instrument
Classifications
U.S. Classification433/102
Cooperative ClassificationA61C5/023