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Mathew m

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US1307446A
US1307446A US1307446DA US1307446A US 1307446 A US1307446 A US 1307446A US 1307446D A US1307446D A US 1307446DA US 1307446 A US1307446 A US 1307446A
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cutting
rod
dental
edges
instrument
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    • A61C5/023
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00Filling or capping teeth
    • A61C5/40Implements for surgical treatment of the roots or nerves of the teeth; Nerve needles; Methods or instruments for medication of the roots
    • A61C5/42Files for root canals; Handgrips or guiding means therefor

Description

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.

US1307446A Mathew m Expired - Lifetime US1307446A (en)

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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1979000344A1 (en) * 1977-12-05 1979-06-28 Engstroem G Root canal file and method of manufacturing it
US4260379A (en) * 1979-05-17 1981-04-07 Sybron Corporation Endodontic instrument
US4268253A (en) * 1979-12-26 1981-05-19 Gross Michael J Dowel post for dental and medical prosthetic devices
US4332561A (en) * 1979-08-03 1982-06-01 Inventive Technology International, Inc. Dental file
US4353698A (en) * 1979-12-20 1982-10-12 Inventive Technology International, Inc. Dental tool
WO1983001565A1 (en) * 1981-11-09 1983-05-11 Inventive Tech Int Dental instrument
US4443193A (en) * 1983-02-08 1984-04-17 Roane James B Endodontic instrument
US4536159A (en) * 1983-02-08 1985-08-20 Roane James B Endodontic instrument
US4538989A (en) * 1979-10-01 1985-09-03 Dentsply International, Inc. Dental reamer
US4611508A (en) * 1983-02-08 1986-09-16 Roane James B Endodontic instrument
US4634378A (en) * 1982-12-10 1987-01-06 Micro-Mega Dental drill
US4661061A (en) * 1985-07-22 1987-04-28 Howard Martin Four sided root canal rasp for root canal preparation
US4871312A (en) * 1988-11-04 1989-10-03 Quality Dental Products, Inc. Dental compactor instrument
US4904185A (en) * 1988-11-04 1990-02-27 Mcspadden John T Dental instrument
US4934934A (en) * 1988-11-04 1990-06-19 Quality Dental Products, Inc. Dental file/reamer instrument
US5017137A (en) * 1988-11-18 1991-05-21 Bernard Weissman Dental tool reamer capable of following natural curvature of tooth canal
US5035617A (en) * 1990-06-05 1991-07-30 Mcspadden John T Endodontic instrument
US5106298A (en) * 1991-04-03 1992-04-21 Heath Derek E Endodontic dental instrument
US5213499A (en) * 1992-01-28 1993-05-25 Laser Endo Technic Endodontic files
USRE34439E (en) * 1988-11-04 1993-11-09 Heath Derek E Dental compactor instrument
US5692902A (en) * 1995-03-24 1997-12-02 Maillefer Instruments S.A. Set of instruments for the boring of radicular dental canals
US5735689A (en) * 1995-12-11 1998-04-07 Tycom Dental Corporation Endodontic dental instrument
US5752825A (en) * 1994-04-28 1998-05-19 Buchanan; Leonard Stephen Endodontic treatment system
US5842862A (en) * 1996-11-27 1998-12-01 Nissan; Roni Endodontic tool
US5882198A (en) * 1997-03-28 1999-03-16 Ormco Corporation Endodontic instrument having enhanced compliance at the tip
US5938440A (en) * 1995-12-11 1999-08-17 Ormco Corporation Endodontic instrument
US6419488B1 (en) 1995-12-11 2002-07-16 Ormco Corporation Endodontic instrument having a chisel tip
US20050100859A1 (en) * 2003-03-31 2005-05-12 Graybill Lonnie M. Endodontic instruments and method of manufacturing same
US7967605B2 (en) 2004-03-16 2011-06-28 Guidance Endodontics, Llc Endodontic files and obturator devices and methods of manufacturing same
US8714978B2 (en) 2010-10-06 2014-05-06 Dentsply International Inc. Endodontic system and method

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1979000344A1 (en) * 1977-12-05 1979-06-28 Engstroem G Root canal file and method of manufacturing it
US4260379A (en) * 1979-05-17 1981-04-07 Sybron Corporation Endodontic instrument
US4457710A (en) * 1979-08-03 1984-07-03 Inventive Technology International Dental instrument
US4332561A (en) * 1979-08-03 1982-06-01 Inventive Technology International, Inc. Dental file
US4538989A (en) * 1979-10-01 1985-09-03 Dentsply International, Inc. Dental reamer
US4353698A (en) * 1979-12-20 1982-10-12 Inventive Technology International, Inc. Dental tool
US4268253A (en) * 1979-12-26 1981-05-19 Gross Michael J Dowel post for dental and medical prosthetic devices
WO1982003978A1 (en) * 1981-05-14 1982-11-25 Tech Int Inventive Dental file
WO1983001565A1 (en) * 1981-11-09 1983-05-11 Inventive Tech Int Dental instrument
US4634378A (en) * 1982-12-10 1987-01-06 Micro-Mega Dental drill
US4443193A (en) * 1983-02-08 1984-04-17 Roane James B Endodontic instrument
US4536159A (en) * 1983-02-08 1985-08-20 Roane James B Endodontic instrument
US4611508A (en) * 1983-02-08 1986-09-16 Roane James B Endodontic instrument
US4661061A (en) * 1985-07-22 1987-04-28 Howard Martin Four sided root canal rasp for root canal preparation
US4871312A (en) * 1988-11-04 1989-10-03 Quality Dental Products, Inc. Dental compactor instrument
US4904185A (en) * 1988-11-04 1990-02-27 Mcspadden John T Dental instrument
US4934934A (en) * 1988-11-04 1990-06-19 Quality Dental Products, Inc. Dental file/reamer instrument
USRE34439E (en) * 1988-11-04 1993-11-09 Heath Derek E Dental compactor instrument
US5017137A (en) * 1988-11-18 1991-05-21 Bernard Weissman Dental tool reamer capable of following natural curvature of tooth canal
US5035617A (en) * 1990-06-05 1991-07-30 Mcspadden John T Endodontic instrument
US5106298A (en) * 1991-04-03 1992-04-21 Heath Derek E Endodontic dental instrument
US5213499A (en) * 1992-01-28 1993-05-25 Laser Endo Technic Endodontic files
US5897316A (en) * 1994-04-28 1999-04-27 Buchanan; Leonard Stephen Endodontic treatment system
USRE39174E1 (en) * 1994-04-28 2006-07-11 Leonard Stephen Buchanan Endodontic treatment system
US5752825A (en) * 1994-04-28 1998-05-19 Buchanan; Leonard Stephen Endodontic treatment system
US5836764A (en) * 1994-04-28 1998-11-17 Buchanan; Leonard Stephen Endodontic treatment system
US5842861A (en) * 1994-04-28 1998-12-01 Buchanan; Leonard Stephen Endodontic treatment system
US5921775A (en) * 1994-04-28 1999-07-13 Buchanan; Leonard Stephen Endodontic treatment system
US5692902A (en) * 1995-03-24 1997-12-02 Maillefer Instruments S.A. Set of instruments for the boring of radicular dental canals
US5902106A (en) * 1995-12-11 1999-05-11 Ormco Corporation Endodontic dental instrument
US5938440A (en) * 1995-12-11 1999-08-17 Ormco Corporation Endodontic instrument
US5980250A (en) * 1995-12-11 1999-11-09 Tycom Dental Corporation Endodontic instrument
US6419488B1 (en) 1995-12-11 2002-07-16 Ormco Corporation Endodontic instrument having a chisel tip
US5735689A (en) * 1995-12-11 1998-04-07 Tycom Dental Corporation Endodontic dental instrument
US5842862A (en) * 1996-11-27 1998-12-01 Nissan; Roni Endodontic tool
US5882198A (en) * 1997-03-28 1999-03-16 Ormco Corporation Endodontic instrument having enhanced compliance at the tip
US20050100859A1 (en) * 2003-03-31 2005-05-12 Graybill Lonnie M. Endodontic instruments and method of manufacturing same
US7311522B2 (en) 2003-03-31 2007-12-25 Miltex Technology Corporation Endodontic instruments and method of manufacturing same
US7967605B2 (en) 2004-03-16 2011-06-28 Guidance Endodontics, Llc Endodontic files and obturator devices and methods of manufacturing same
US8714978B2 (en) 2010-10-06 2014-05-06 Dentsply International Inc. Endodontic system and method

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