Geometric optimization for development of glide path preparation nickel-titanium rotary instrument

Journal of Endodontics
Jung-Hong HaHyeon-Cheol Kim

Abstract

This study was done to develop a glide path preparation nickel-titanium rotary instrument by size optimization procedures and evaluate the properties of the prototype. G-1 and G-2 files were tested for cyclic fatigue, torsional resistance, and screw-in force. The cyclic fatigue resistance was compared by measuring the number of cycles to failure by using a 90° curved metal canal (n = 10). The torsional resistance was evaluated at 3 levels (2, 4, and 6 mm from the file tip) by measuring the ultimate torsional load (n = 10 each level). The screw-in forces (n = 5) were measured during sequential pecking in a simulated resin block to the end of foramen by using the customized shaping device (AEndoS). Meanwhile, finite element models of G-1 and G-2 files were made by reverse engineering, and their bending stiffness and torsional properties were calculated. By analyzing the results from mechanical tests and finite element analysis, a universal G (uG) file was designed to have intermediary mechanical properties, and then the prototype was fabricated by the manufacturer. Cyclic fatigue and torsional resistance tests and screw-in force with the uG were compared with G-1 and G-2 files. The prototype of uG file showed higher cyclic fatigu...Continue Reading

References

Feb 1, 1997·Journal of Endodontics·J P PruettD L Carnes
Mar 27, 2003·International Endodontic Journal·O A PetersF Barbakow
Apr 19, 2003·International Endodontic Journal·D SonntagV Stachniss
Sep 22, 2006·Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.]·John West
Nov 27, 2007·Journal of Endodontics·Gary S P CheungBrian W Darvell
Feb 19, 2011·Journal of Endodontics·Jiwan YumHyeon-Cheol Kim
Dec 14, 2011·Journal of Endodontics·Damiano PasqualiniElio Berutti
Sep 18, 2012·Journal of Endodontics·Hélio P LopesMarcelo Mangelli
Feb 14, 2013·Journal of Endodontics·Jung-Hong HaHyeon-Cheol Kim

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