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Publication numberUS1312120 A
Publication typeGrant
Publication dateAug 5, 1919
Filing dateJun 2, 1917
Publication numberUS 1312120 A, US 1312120A, US-A-1312120, US1312120 A, US1312120A
InventorsSpencer M. Httrtt
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Point for nerve-canals of teeth
US 1312120 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)



Patented Aug. 5, 1919.




Specification of Letters Patent.

Application filed June 2, 1917. Serial No. 172,385.

To all whom it may concern:

Be it known that I, SPnNcER'M. HURTT, a citizen of the United States, residing at Ridley Park, county of Delaware, and State of Pennsylvania, have invented a new and useful Improvement in Points for Nerve- Canals of Teeth, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to points adapted for use by dentists in filling the nerve canals of teeth from which the pulp or nerve been removed.

Nerve canal points are usually manufactured of gutta percha in the shape of an elongated cone, as such shape most nearly approximates the shape of the nerve canal.

In applying the point, it is necessary to pick it up, near the large end, with a pair of dental pliers and insert the small end into the nerve canal of the tooth, the point being gradually hooked into the canal by manipulation of the pliers and finally tamped into place.

Considerable difficulty is met with in picking up and holding the point in the pliers due to its circular periphery and smooth surface, the tendency being for the point to slip and fly out of the grip of the pliers, particularly on coming into contact with the tooth, thus rendering the operation of inserting it in the canal a di'lfieult one. This difficulty is only partially overcome by making the point in the shape of an elongated four-sided pyramid, but this shape is not adapted to the shape of the canal.

The object of my invention is to provide a nerve canal point which may be positively gripped and held by the pliers and which will have no tendency to slip on being inserted into the nerve canal, and which at the same time is of a shape adapted to properly fit the canal.

Referring to the accompanying drawings, in which I have illustrated a preferred embodiment of my invention Figure 1 is a plan view of my improved point.

2 is a side elevation of the point.

Fig. 3 is a rear view of the point.

Fig. 4 is a plan view of the rear portion of the point with a modified form of serra tions.

Fig. 5 is a plan view similar to Fig. 4 with another modified form of serrations.

The point, preferably made of gutta percha, is composed of an elongated coneshaped body portion 05 terminating at one end in the fine point or apex b. The rear portion of the body is flattened out at opposite sides, and preferably also increased in width and reduced in thickness, for a short distance from the rear end, forming two practically plane faces 0 and cl extending substantially parallel to each other. Each of the faces 0 and d is roughened or serrated.

In practice, the faces 0 and (Z present fiat surfaces to the gripping points of the pliers, which assures a firm grip and avoids any possibility of the point slipping out of their The roughening may be effected in various Ways, preferably by serrations or grooves, which may extend transversely as at 00, Figs. 1 and 2, diagonally, as at y, Fig. 4:, or longitudinally, as at 2, Fig. 5.

Having now fully described my invention, what I desire to claim and protect by Letters Patent is:

A point for nerve canals of teeth comprising an elongated body of conical shape from relatively near the base thereof toward the apex, the part between said conical portion and the base having two relatively wide, fiat and roughened parallel faces adapting them to be readily grasped and held by pliers.

In testimony of which invention I have hereunto set my hand at Philadelphia on this 29th day of May, 1917.


(topics of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2846927 *Oct 25, 1954Aug 12, 1958Johnson & JohnsonMethod of making absorbent dental point
US3318000 *Apr 6, 1964May 9, 1967Lawrence ParisDental root canal filling point
US3434209 *May 12, 1965Mar 25, 1969Weissman BernardMethod for building superstructures on dentition
US3949479 *Aug 1, 1974Apr 13, 1976Oscar MalminEndodontic operating and sealing method and apparatus therefor
US7086864Jun 6, 2002Aug 8, 2006Pentron Clinical Technologies, LlcEndodontic post system
US7163401Aug 1, 2003Jan 16, 2007Pentron Clinical Technologies, LlcEndodontic post and obturating system
US7168952Aug 1, 2003Jan 30, 2007Pentron Clinical Technologies, LlcEndodontic post and obturating system
US7204874Oct 24, 2002Apr 17, 2007Pentron Clinical Technologies, LlcRoot canal filling material
US7204875Nov 26, 2002Apr 17, 2007Pentron Clinical Technologies, LlcDental filling material
US7211136Jun 18, 2003May 1, 2007Pentron Clinical Technologies, LlcDental filling material
US7252508 *Dec 13, 2002Aug 7, 2007Pentron Clinical Technologies, LlcEndodontic obturator
US7303817Aug 6, 2004Dec 4, 2007Weitao JiaDental filling material
US7750063Dec 21, 2006Jul 6, 2010Pentron Clinical Technologies, LlcDental filling material
US7837471Sep 19, 2007Nov 23, 2010Pentron Clinical Technologies, LlcDental filling materials and methods of use
US20060204934 *Feb 17, 2006Sep 14, 2006Werner MannschedelGutta percha tip and method for producing the same
US20070184405 *Dec 21, 2006Aug 9, 2007Weitao JiaDental Filling Material
US20140272802 *Feb 21, 2014Sep 18, 2014Nathan Y. LIMulti-taper dental root canal filling points/cones and process of making same
U.S. Classification433/224
Cooperative ClassificationA61C5/04