Évaluation ex vivo d'une technique de retrait des instruments endodontiques fracturés basée sur l'usinage laser du nickel-titane

Abstract : Aim : evaluate in vitro, on extracted teeth, a new method to remove broken endodontic instruments by a femtoseconds laser. Method : One shape® rotary instrumentation, cut 5mm before the extremity, were broken into straight root canal of mandibulary anterior teeth. 20 teeth were randomly divided in 3 groups : (1) breakage at 2mm from the coronary fragment, (2) at 4mm, (3) at 6mm. A staging platform was created (Gates 1 to 4), and a negative cross was machined at a 200mW power in 40 shots on the broken One shape instrument. The antagonist screw driver was manufactured by laser machining at a 1W power and 40 shots (λ : 1030nm ; 450fs ; 100KHz ; 10mm.s-1). The screw driver was engaged in the root canal under operating microscope to unscrew counterclockwise the broken instrument. Results : none of the broken instruments were removed. 25 % (5/20) were mobilized. Conclusion : this method, alone, doesn’t allow the removal of broken instruments. More studies are needed to determine whether, if combined with other methods, the results could be improved.
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Master Thesis
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Submitted on : Thursday, July 13, 2017 - 12:59:08 PM
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Anne Klotz. Évaluation ex vivo d'une technique de retrait des instruments endodontiques fracturés basée sur l'usinage laser du nickel-titane . Chirurgie. 2017. ⟨dumas-01561815⟩

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