Highlights• Micro-CT comparisons of centering ability and apical canal transportation of 3 glide path enlargement techniques in curved root canals of extracted mandibular molars.• K-files were least centered and caused more transportation.• ProGlider displayed superior centering ability.• ProGlider and G-Files caused significantly less transportation than K-files. AbstractIntroduction: The purpose of this study was to compare centering ability and apical

Highlights • This study compared canal shaping with the rotary One Shape (nickel titanium), rotary ProTaper NEXT (M-Wire), and reciprocating Primary WaveOne Gold (Gold wire) after glide path preparation with K-Files, One G, and ProGlider. • No statistically significant difference in the mean centering ratios at the apical, midroot, and coronal levels of the various glide path groups in combination with the shaping instruments. • WaveOne Gold exhibited the lowest transportation values at all levels with ProGlider. • ProTaper NEXT exhibited the highest volume of dentin removed regardless of the glide path preparation technique used.

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Glide path preparation times with the rotary instrument groups were significantly faster than with stainless steel manual K-files.

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