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ePaper created 2018-05-16, 11:45:19 | version 1.38.0
Fig. 7a Fig. 7b Fig. 8a Fig. 8b Fig. 7b Minimally invasive endo- dontics, preservation of coronal dentinal girth and optimal apical size (courtesy of Dr. G. Debelian). Fig. 7a A traditional NiTi file from a round blank is represented in red and XP-endo Shaper in blue. The sinu- soidal motion of the XP-endo Shaper in contrast to the round file, which augers, demonstrates the benefit of adaptive debridement. In conjunc- tion with the XP-endo Finisher, unprecedented levels of debris removal and disinfection are possible. Fig. 8a Photoelasticity is an experimental technique for stress and strain analysis useful for condi- tions of complicated geometry or loading. As evidenced by the accom- panying images, the XP-endo Shaper demon- strates the least stress in the apical third. Fig. 8b ProTaper NEXT was the first example of an attempt to migrate away from the augering peck and pull motion of most NiTi files. Its swaggering motion was an improvement with regard to emulating the constricted envelope of motion; however, its foundation remained a round blank with all the attendant issues related to cyclic fatigue and torsional failure. 38 — issue 2018 Endodontics Article