Fig. 2
From: Shaping outcome of ProTaper NEXT for root canal preparation in mandibular incisors: a micro-CT study
Percentage change of the root canal morphological parameters after root canal preparation. The percentage change of UCW (A), SMI (B), Formfactor (C), Roundness (D), AR (E), major diameter (F), minor diameter (G), canal area (H) and canal volume (I) were evaluated in both oval canal group and round canal group in different regions (coronal, middle and apical third). *indicates P < 0.05, **indicates P < 0.01, ***indicates P < 0.001. UCW: Untouched canal wall. SMI: Structure model index. AR: aspect ratio. Δ%: the percentage change of the canal morphological parameters