Dentistry – Apparatus – Hand manipulatable implement
Reexamination Certificate
2002-05-28
2004-03-02
O'Connor, Cary E. (Department: 3732)
Dentistry
Apparatus
Hand manipulatable implement
Reexamination Certificate
active
06699039
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The invention relates generally to dentistry tools and, more specifically, to a versatile and ergonomic system for manipulation of dental appliances.
BACKGROUND OF THE INVENTION
Dentistry, particularly restorative dentistry, is a demanding craft—requiring a skillful blend of structural engineering and aesthetics. Dentists must artfully construct and shape what are often very complicated restorative structures while working within the confined space of a patient's mouth. Further complicating this already challenging task are safety and sanitary requirements, ergonomic problems, and concerns about patient comfort. At its best, such work might be considered tedious. At its worst, such work might be considered nearly impossible.
As a result, a number of devices and methodologies have been developed to aid dentists in performing routine procedures. Specialized handpieces, powered tools, shielding and grasping devices are continually developed to assist in nearly every aspect of routine dentistry. Often times, however, the development of one aid may simplify a particular aspect of a procedure while complicating other aspects of the same procedure. Furthermore, there are a number of routine procedures, for which no specialized tools exist, that require dentists to utilize existing devices in an unintended fashion. Thus, restorative dentistry often relies on both specialization and improvisation.
Consider, for example, the tools and procedures involved in filling interproximal cavities. Depending upon the location and size of the filling needed, a dentist may have a very difficult time forming a filling of proper structural integrity that provides a desired aesthetic appearance and proper interproximal contact. A relatively popular method of interproximal filling relies on the use of matrix bands.
Matrix bands are small appliances that serve, essentially, as a form for interproximal fillings (especially bonded fillings) when some portion of the external tooth structure is missing or has been removed. The bands are used to restore the tooth structure to its natural contour, without having to dispose excessive bonding material to the area surrounding the filling. Matrix bands are generally formed of aluminum or some other similar semi-rigid material, and typically come in a number of sizes to match tooth and filling sizes. The bands usually have some degree of concavity, in addition to multiple degrees of curvature, to match the often asymmetrical, quasi-spherical contour of a tooth. After proper placement and seating, the matrix bands are usually held in place by some sort of matrix retainer (e.g., wedge, bi-tine ring).
Thus, once a matrix band is in place, the filling procedure is significantly simplified. The proper placement and seating of a matrix band is, however, no trivial task. It is, in fact, a task that appears to be widely recognized as difficult and involved—and one for which conventional apparatus and methods are not properly adapted.
Conventionally, matrix bands have been placed using only the dentist's fingers, or placed by simple tweezers, straight pliers, or even cotton pliers. These conventional methods share a number of common problems and challenges, and each individual method presents its own unique problems and concerns.
One primary concern is maintaining the integrity of the matrix band itself. Until properly placed, the band is highly susceptible to bending and crimping. This can lead to unacceptable deformities in the band, requiring removal and placement of a new band, or acceptance of a structurally or aesthetically inferior filling.
Even the most nimble of dentists, with the daintiest of fingers, may have difficulty working within the limited space of a patient's mouth to properly place a matrix band without deforming the band. The location of the required filling can further complicate the procedure. The further posterior the required filling is (e.g., between molars), or if the filling is on the mesial surface of a tooth, the more difficult it is to manually place the small, flexible matrix bands. Furthermore, placement by finger may be much more difficult for dentists with larger hands.
Conventional placement methods typically require a great deal of manipulation at ergonomically awkward angles for a dentist. That ergonomically improper manipulation might, over time, lead to degenerative neuromuscular problems. Furthermore, if there is strong interproximal contact between the teeth, the dentist must either ply the teeth apart, such that the instrument used to ply the teeth apart does not impede the placement of the band, or break interproximal contact, in order to place the band without deforming it. Breaking interproximal contact may require removal of an excessive (i.e., unacceptable) amount of tooth structure, however, especially where only a small filling is required.
Although some conventional methods of matrix band placement utilize conventional, general-purpose instruments (e.g., conventional tweezers and pliers)—thereby reducing some of the problems associated with working in the confined space of a patient's mouth—extensive instrument manipulations, ergonomic challenges, and increased potential for damage to the band remain problematic. Using such conventional instruments may still be difficult for posterior placements. Furthermore, such general-purpose instruments are typically unsuitable for firmly grasping and manipulating the curved matrix bands without deformation. Most such instruments have flat, planar grasping surfaces that can bend or damage a matrix band. The grasping surfaces themselves are generally not arcuate in nature, and thus will not tightly grasp a significant cross section of a matrix band without deformation. Finally, most such conventional instruments are not curved or angled to provide reliable matrix band disposition in both distal and mesial orientations. Thus, placement with such conventional instruments is often tedious, time-consuming, and not possible with existing instruments.
SUMMARY OF THE INVENTION
Thus, a system that provides easy and reliable placement and removal of specially contoured dental appliances, such as matrix bands, in an ergonomically proper manner, readily usable for both distal and mesial manipulations, is now needed. This system should provide dentists with a tool that simplifies restorative procedures without deforming or damaging the appliances being placed. The system should thus provide relief from problems associated with conventional methods and apparatus.
Comprehending this, the present invention provides a versatile system for the efficient manipulation of specially contoured dental appliances, especially matrix bands. The present invention provides a shaped grasping member assembly for grasping the dental appliance. The grasping members may be angled or curved in either a convex or concave orientation, such that their angulation or curvature closely approximates the contour of the appliance(s) to be placed, and such that the angulation or curvature may be employed to facilitate manipulations in distal, mesial, or both mesial and distal orientations. The member, or members, on one side of the assembly may include an apical seat disposed along an upper edge, to secure the appliance in place and assist in applying seating pressure to the appliance.
The present invention also provides an actuating assembly, to which the grasping member assembly may be permanently or temporarily attached, such that the attachment may further facilitate placements in distal, mesial, or both mesial and distal orientations.
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patent: 2002/010
Burns Ronald W.
Dryer Pliers, Inc.
O'Connor Cary E.
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