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Endodontic instrument having notched cutting surfacesRelated Patent Categories: Dentistry, Apparatus, BroachEndodontic instrument having notched cutting surfaces description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070178426, Endodontic instrument having notched cutting surfaces. Brief Patent Description - Full Patent Description - Patent Application Claims
RELATED APPLICATIONS [0001] This application claims priority under 35 U.S.C. .sctn. 120(e) to provisional application Ser. No. 60/312,823 filed Aug. 16, 2001, which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates generally to the field of dentistry and more particularly to a fluteless endodontic instrument having notched cutting surfaces for cleaning and enlarging a root canal. [0004] 2. Description of the Related Art [0005] In the field of endodontics, one of the most important and delicate procedures is that of cleaning or extirpating a root canal to provide a properly dimensioned cavity while essentially maintaining the central axis of the canal. This step is important in order to enable complete filling of the canal without any voids and in a manner which prevents the entrapment of noxious tissue in the canal as the canal is being filled. [0006] In a root canal procedure, the dentist removes injured tissue and debris from the canal prior to filling the canal with an inert filling material. In performing this procedure the dentist must gain access to the entire canal, shaping it as necessary. But root canals normally are very small in diameter, and they are usually quite curved. It is therefore very difficult to gain access to the full length of a root canal. [0007] Many tools have been designed to perform the difficult task of cleaning and shaping root canals. Historically, dentists have used a wide multitude of tools to remove the soft and hard tissues of the root canal. These tools, usually called endodontic files, have been made by three basic processes. In one process, a file is have been made by three basic processes. In one process, a file is created by twisting a prismatic rod of either square or triangular cross section in order to create a file with helical cutting/abrading edges ("K-file"). The second process involves grinding helical flutes into a circular or tapered rod to create a file with one or more helical cutting edges ("Hedstrom file"). The third method involves "hacking" or rapidly striking a circular or tapered rod with a blade at a given angle along the length of the rod, thus creating an endodontic file characterized by a plurality of burr-like barbs or cutting edge projections ("barbed file" or "broach"). Each of these methods produces an instrument having unique attributes, advantages, and disadvantages. [0008] Endodontic files have historically been made from stainless steel, but due to the inherent stiffness and brittleness of steel, these tools can sometimes pose a significant danger of breakage in the curved root canal. More recent designs have attempted to overcome these problems. Some attempt to alter the geometry of the stainless steel file in order to provide more flexibility. This approach has had only limited success, and the stainless steel tools still have a tendency to break if over-torqued or fatigued. [0009] A series of comparative tests of endodontic instruments made of nickel-titanium alloy (Nitinol.TM. or NiTi) and stainless steel were conducted and published in an article entitled "An Initial Investigation of the Bending and the Torsional Properties of Nitinol Root Canal Files," Journal of Endodontics, Volume 14, No. 7, July 1988, pages 346-351. The Nitinol instruments involved in these tests were manufactured in accordance with fabrication procedures and operating parameters conventionally used in the machining of stainless steel endodontic instruments. This process involved grinding a helical flute in a tapered shaft to form helical cutting edges. [0010] The reported tests demonstrated that the NiTi instruments produced by the described machining process exhibited superior flexibility and torsional properties as compared to stainless steel instruments, but the cutting edges of the instruments exhibited heavily deformed metal deposits which, according to the article, rendered the instruments generally unsatisfactory for clinical use. [0011] In general, alloys of nickel (Ni) and titanium (Ti) have a relatively low modulus of elasticity (0.83 GPa) over a wide range, a relatively high yield strength (0.195-690 MPa), and the unique and the unusual property of being "superelastic" over a limited temperature range. Superelasticity refers to the highly exaggerated elasticity, or spring-back, observed in many NiTi and other superelastic alloys over a limited temperature range. Such alloys can deliver over 15 times the elastic motion of a spring steel, i.e., withstand twisting or bending up to 15 times greater without permanent deformation. The particular physical and other properties of Nitinol alloys may be varied over a wide range by adjusting the precise Ni/Ti ratio used. However, the superelastic properties of NiTi also make the material very difficult and expensive to machine. [0012] Machining of NiTi tools for endodontic use has been an area of significant development efforts in recent years. For example, U.S. Pat. No. 5,464,362 to Heath et. al. describes a method of grinding a rod of a nickel-titanium alloy in order to create a fluted file. However, current state-of-the art manufacturing processes remain relatively expensive and slow and require sophisticated 6-axis grinding machines and the like. [0013] Accordingly, there is a need for an improved endodontic file design which will allow for more economical manufacture of an endodontic tool from nickel titanium and other suitable alloys. SUMMARY OF THE INVENTION [0014] It is therefore an object of the present invention to provide an improved endodontic file design and method of manufacturing such files from nickel-titanium alloys, stainless steel and/or other materials. It is another object of the invention to provide an endodontic instrument having a reduced tendency to break during use. It is another object of the invention to improve the efficacy of an endodontic instrument and/or to reduce the number of instruments necessary to enlarge a root canal. Still another object of the invention is to provide an endodontic instrument which can be quickly and economically manufactured using conventional 3-axis grinding machines. [0015] According to one embodiment of the present invention, a fluteless endodontic file is provided, formed from a generally prismatic rod (e.g., having multiple flats and interposed sharp corners) preferably tapered along its length. A plurality of notches are cut into the exposed corners in an alternating regular and/or irregular pattern defining cutting surfaces, points and/or edges. The notched cutting surfaces are formed such that the file, when rotated and/or reciprocated within a root canal, effectively cuts/debrides hard tissue (known in the art as dentin) as well as soft tissue, thus, forming an optimal canal shape. The cutting surfaces are also preferably formed at an angle to the centerline of the instrument to provide optimal cutting efficiency and material removal. A dental instrument having features and advantages of the present invention may be generally characterized as having a prismatic shape with multiple vertically aligned notched cutting surfaces preferably formed at an angle from the centerline of the shaft. The design exhibits increased flexibility and efficacy, has less tendency to bind and break within the root canal and significantly reduces manufacturing and capital equipment costs. [0016] For purposes of summarizing the invention and the advantages achieved over the prior art, certain objects and advantages of the invention have been described herein above. Of course, it is to be understood that not necessarily all such objects or advantages may be achieved in accordance with any particular embodiment of the invention. Thus, for example, those skilled in the art will recognize that the invention may be embodied or carried out in a manner that achieves or optimizes one advantage or group of advantages as taught herein without necessarily achieving other objects or advantages as may be taught or suggested herein. [0017] All of these embodiments are intended to be within the scope of the invention herein disclosed. These and other embodiments of the present invention will become readily apparent to those skilled in the art from the following detailed description of the preferred embodiments having reference to the attached figures, the invention not being limited to any particular preferred embodiment(s) disclosed. BRIEF DESCRIPTION OF THE DRAWINGS [0018] Having thus summarized the general nature of the invention and its essential features and advantages, certain preferred embodiments and modifications thereof will become apparent to those skilled in the art from the detailed description herein having reference to the figures that follow, of which: [0019] FIG. 1 is a section view of a tooth and root structure illustrating the use of a conventional fluted endodontic instrument for performing a typical root canal procedure; [0020] FIG. 2A is a side elevation view of a fluteless endodontic instrument having features and advantages of the present invention; Continue reading about Endodontic instrument having notched cutting surfaces... 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