Dentistry – Apparatus – Tool bit
Reexamination Certificate
2000-09-18
2001-11-20
Lucchesi, Nicholas D. (Department: 3732)
Dentistry
Apparatus
Tool bit
C408S059000
Reexamination Certificate
active
06319005
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is an improvement of the invention of U.S. Pat. No. 5,261,818 (1993) to Shaw, entitled Multi-Fluted Dental Irrigation Drill, and U.S. Pat. No. 6,106,292 (2000) to the present inventive entity, entitled Dental Irrigation Drill with Internal Anti-Backwash Baffle.
The invention relates to dental drills and, more particularly, to so-called fluted irrigation spade drills employed in the creation of channels in the human jaw prior to the insertion of an implant of a post upon which a dental structure such as an abutment or bridge is to be placed. A difficulty in prior art dental drills of the above type is that, due to rotational eccentricity and flutter relative to the axis of rotation of the drill, a degree of trauma is imparted to the jawbone of the patient. Further, the dentist cannot effectively control pressure and depth of penetration of the drill where eccentricity or flutter exists in the drill action.
The present improvement of the above-referenced patent to Shaw entails changes in the external geometry thereof and, internally, provides to the irrigation channel thereof an anti-backwash baffle formed between opposing press-fittable complemental surfaces of a shank cutting portion of the drill. Accordingly, the present invention improves upon the invention of Shaw both in terms of cutting effect of external geometry and in terms of internal fluid flow characteristic. More particularly, the structure of the present invention employs a flat stub nose geometry, as opposed to complex distal end surfaces of the drill of Shaw and, additionally, provides an internal baffle or valve to create a fluid tight seal medially within the irrigation channel of the drill to prevent backwash into the shank portion thereof, a phenomenon which is undesirable in terms of both the aesthetics of implant dentistry and in terms of disrupting concentration of the dentist during implant procedures. These advantages are achieved while maintaining the positive associated with said reference to Shaw, namely, a superior implant cutting tool which facilitates a maximum of osseo-integratation of the implant within the implant site of the jawbone.
Other related art known to the within inventors includes U.S. Pat. No. 5,569,035 (1996) to Balfour et al; U.S. Pat. No. 5,791,902 (1998) to Lauks; and No. U.S. Pat. No. 5,839,897 to Borders.
SUMMARY OF THE INVENTION
A dental drill, formed of a substantially solid elongate body, having: (a) a longitudinal shank including a proximal and a distal end and having an axially disposed irrigation channel; (b) a working portion comprising (i) an annular boss integrally disposed distally of said shank; (ii) a neck of reduced radius relative to said boss, integrally disposed distally of said boss; (iii) a cutting region of uniform diameter integrally disposed distally of said neck; and (iv) a cutting region having a tapered external geometry, integrally dependant distally of said cutting region of uniform diameter, said cutting regions integrally including at least four integral axi-symmetric flutes formed upon lateral surfaces of said regions, each of said flutes defining co-axial peripheral profiles, each of said flutes separated by substantially co-axial integral channels, each having at least one outlet therein, said working portion of said drill having an irrigation channel extending the entire length thereof and in integral communication with said shank irrigation, said one outlet of each axial channel located proximally to a distal tip of said tapered cutting region, said tip defining a surface formed integrally and continuously with distal ends of said flutes and channels; and (c) a fluid-tight unidirectional baffle formed between opposing complemental surfaces of said shank and working portions, inclusive of said irrigation channels thereof, said baffle defining a one-way interior valve situated at an interface of said irrigation channels to thereby preclude proximal fluid backflow within said irrigation channel of said shank during use of the dental drill.
It is an object of the present invention to provide a multi-fluted dental irrigation drill in which fluid backwash within the shank irrigation channel thereof is minimized during an implant procedure.
It is another object to provide an irrigation drill of the above type having an exterior geometry of improved cutting effectiveness relative to that known in the art.
It is a further object of the invention to provide an improved irrigation drill having particular utility in creating a bore of a depth and geometry in jaw bones, at a site of dental implant insertion, that is precisely complemental to tapered implants to be inserted into said site.
It is another object to provide a drill of the above type that will minimize the eccentricity and flutter in the rotation thereof, thusly minimizing trauma to the jaw of the patient during insertion of an implant.
It is a further object to provide an irrigation dental spade drill to enable improve control of pressure, depth and refinement of penetration by the implant dentist.
The above and yet other objects and advantages of the invention will become apparent from the hereinafter set forth Brief Description of the Drawings, Detailed Description of the Invention and Claims appended herewith.
REFERENCES:
patent: 4021920 (1977-05-01), Kirschner et al.
patent: 4127279 (1978-11-01), Wright
patent: 5261818 (1993-11-01), Shaw
patent: 5569035 (1996-10-01), Balfour et al.
patent: 5791902 (1998-08-01), Lauks
patent: 5839897 (1998-11-01), Bordes
Hollander Bruce
Kozak Ingo
Biolok International Inc.
Lucchesi Nicholas D.
Silverman M. K.
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