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.

The aim was to evaluate apical debris extrusion produced by a single-file system used in counter-clockwise reciprocation and compare it to rotary singlefile systems used in clockwise rotation and clockwise reciprocation. A total of 100 first mandibular molars were divided into five groups (n = 20): (i) WaveOne Gold Glider and Primary instrument in counter-clockwise reciprocation; (ii) One G and One Curve file in clockwise rotation; (iii) One G and One Curve file in clockwise reciprocation; (iv) TruNatomy Glider and Prime instrument in clockwise rotation; and (v) TruNatomy Glider and Prime instrument in clockwise reciprocation. Apical debris extruded was measured after glide path preparation and canal preparation. WaveOne Gold displayed significantly higher amounts of apical debris extrusion in all the groups (P < 0.05). The lowest mean values were recorded by clockwise reciprocation groups: TruNatomy Glider, One Curve and TruNatomy Glider and Prime combined value, for glide path, canal preparation and combined mean values, respectively.