Needle for extracting endodontic separated instruments
AssigneeUniversity of Sharjah
InventorSaaid Ayesh Al Shehadat
Life of this patent
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Abstract
There is provided a needle tip for extracting separated endodontic instruments from the root canal of a tooth. The needle tip is fabricated with a thermomechanically treated alloy exhibiting both shape memory and super-elasticity. There is also provided for a needle that includes a handle and a terminal tip, which is fabricated with a thermomechanically treated alloy. The alloy is thermomechanically treated nickel- titanium alloy. The needle is straight at room temperature and takes on a specific shape when inserted in the canal of the tooth from which the endodontic separated instrument is to be extracted. Also provided herein is a method for removal of endodontic separated instruments from the canal of a tooth.
Claims16
A needle tip for extracting an endodontic separated instrument from
- a root canal of a tooth, the needle tip comprising:
- a temperature- sensitive alloy forming at least a portion of the needle tip,
- wherein said needle tip takes a curved snake-like shape in the root canal from which the endodontic separated instrument is to be removed when the needle tip is inserted inside the root canal, and
- wherein said needle tip is adapted to change shape to become the curved snake-like shape at a body temperature of 37° C. or more and adapted to change shape to become straight at a room temperature of 25° C. or less.
A needle for extracting an endodontic separated instrument from a root canal of a tooth, the needle comprising:
- a gripping handle portion;
- a terminal tip being insertable within the root canal of the tooth;
- wherein the terminal tip is fabricated with a temperature sensitive alloy;
- wherein the terminal tip takes a snake-like shape in the root canal from which the endodontic separated instrument is to be removed, and
- wherein said terminal tip is adapted to change shape to become snake-like at a body temperature of 37° C. or more and adapted to change shape to become straight at a room temperature of 25° C. or less.
A method for extracting an endodontic separated instrument from a root canal of a tooth, the method comprising:
- enlarging the root canal coronal to the endodontic separated instrument;
- exposing the upper end of the endodontic separated instrument using an ultrasonic tip;
- inserting the terminal tip of a needle fabricated with a temperature- sensitive alloy into the root canal of the tooth to engage the upper end of the endodontic separated instrument while the needle tip has a straight shape;
- injecting a hot irrigant in the root canal of the tooth causing the terminal tip of said needle to change to a snake-like shape thereby securely engaging the upper end of the separated instrument;
- and
- removing the endodontic separated instrument along with the needle from the root canal of the tooth.
Dependencies are inferred from the claim text.