Patent application number | Description | Published |
20100003637 | Dental File with Improved Tip Configuration - A dental instrument for cleaning and shaping a root canal of a tooth includes a working portion having three helical flutes and a guide tip with a first, second, and third face surface. A portion of the guide tip is removed so that each of the first and second surfaces are contiguous to a lateral surface of a conical-shaped envelope defining the original tip but a portion of the third surface is not contiguous to a lateral surface of the conical-shaped envelope. The intersection of the first and second surfaces, however, remains at the center point of the guide tip. The removed portion of the guide tip may result in an arcuate-shaped face surface, an angular-shaped face surface, or some combination of the two. | 01-07-2010 |
20100040994 | Reciprocal Reverse Rotation Endodontic File - A single use, reciprocal reverse rotation, endodontic file includes a plurality of spaced apart helical flutes with spiraled lands therebetween. The lands have an edge with a positive cutting angle when the file is rotated in one direction and a scraping angle when rotated in the opposite direction. The file provides for sequential rotation of a selected angle in a forward direction followed by rotation of a slightly less angle in a reverse direction. In one embodiment, the cross-sectional area of the flutes is concave polygonal-shaped at a proximal end of the file and square-shaped at the distal end. In another embodiment, the cross-sectional area of the flutes is convex arcuate-shaped, the lands lying normal to the central longitudinal axis of the file. The handle portion of the file may be configured for use in a rotary handpiece or for manual rotation. | 02-18-2010 |
20100129778 | Methods for disenfecting and removing smear layer from tooth surfaces - Methods for disinfecting and removing smear layer from prepared tooth surfaces are provided. The methods involve irrigating the tooth surface with a disinfectant solution containing doxycycline or tetracycline, a surfactant such as polysorbate, and organic acid such as citric acid. The methods can be used in various dental treatments including, for example, endodontic and periodontic procedures as well as tooth restoration and reconstruction. | 05-27-2010 |
20120094252 | Reciprocal Reverse Rotation Endodontic File - A single use, reciprocal reverse rotation, endodontic file includes a plurality of spaced apart helical flutes with spiraled lands therebetween. The lands have an edge with a positive cutting angle when the file is rotated in one direction and a scraping angle when rotated in the opposite direction. The file provides for sequential rotation of a selected angle in a forward direction followed by rotation of a slightly less angle in a reverse direction. In one embodiment, the cross-sectional area of the flutes is concave polygonal-shaped at a proximal end of the file and square-shaped at the distal end. In another embodiment, the cross-sectional area of the flutes is convex arcuate-shaped, the lands lying normal to the central longitudinal axis of the file. The handle portion of the file may be configured for use in a rotary handpiece or for manual rotation. | 04-19-2012 |
20120231414 | Fatigue-Resistant Nitinol Instrument - A fatigue-resistant Nitinol instrument has a working portion in the deformed monoclinic martensitic state and an austenite finish temperature in the range of 40° to 60° C. Because the operating environment of the instrument is about 37° C., the working portion remains in the monoclinic martensitic state during its use. The relatively high austenite finish temperature and fatigue resistance is achieved by subjecting the nickel-titanium alloy to a final thermal heat treat in a temperature range of about 410° to 440° C. while the nickel-titanium alloy is under constant strain of about 3 to 15 kg. Further, the high austenite finish temperature is achieved without subjecting the alloy to thermal cycling to produce shape memory. Additionally, there are no intermediate processing steps occurring between obtaining a finished diameter of the wire or blank through cold working and the final thermal heat treat under constant strain. | 09-13-2012 |
20130189644 | Multi-Planar Pre-Curved Rotary Endodontic File - An improved rotary endodontic file includes a multi-planar pre-curved apical portion having a first and a second curvature. The pre-curved apical portion begins at about one-third to one-quarter of the working length as measured from the tip end of the endodontic instrument. The first and second curvature permit the file to continually search and engage the walls of a tooth root canal in a forced inside-forced outside manner. As the file works its way down, it breaks free of any ledges encountered, probes lateral- and delta-type openings, and does not allow the file to stray from the curvature of the canal. | 07-25-2013 |
20130263700 | Longitudinally Ground File Having Increased Resistance To Torsional and Cyclic Fatigue Failure - A method of producing an endodontic file that involves grinding in a plane substantially parallel to the longitudinal axis of a rotating dental instrument blank. By grinding the dental instrument blank in this manner, the torsional strength of the resulting endodontic file is not eroded during its production, thereby providing a file that is less susceptible to breakage during its use. | 10-10-2013 |
20140242543 | Fatigue-Resistant Nitinol Instrument - A fatigue-resistant Nitinol instrument has a working portion in the deformed monoclinic martensitic state and an austenite finish temperature in the range of 40° to 60° C. Because the operating environment of the instrument is about 37° C., the working portion remains in the monoclinic martensitic state during its use. The relatively high austenite finish temperature and fatigue resistance is achieved by subjecting the nickel-titanium alloy to a final thermal heat treat in a temperature range of about 410° to 440° C. while the nickel-titanium alloy is under constant strain of about 3 to 15 kg. Further, the high austenite finish temperature is achieved without subjecting the alloy to thermal cycling to produce shape memory. Additionally, there are no intermediate processing steps occurring between obtaining a finished diameter of the wire or blank through cold working and the final thermal heat treat under constant strain. | 08-28-2014 |