Fig. (7) Cone-beam computed tomography scan (axial view) of apical third of mesiobuccal root canals. A – before preparation. B – after preparation. PTN -ProTaper Next^®; PTG - ProTaper Gold^®; MT - Mtwo^®; BR - BioRaCe^®; WOG - WaveOne Gold^®; REC - Reciproc^®; MB – mesiobuccal canal.