February 2, 2011Dentistry with Zeiss OPMI PRO Ergo Operative Microscope: Striving to Find a Pathway to the Apex by Bypassing a “Mega Odontolith” in an Anomalous RC System This is a symptomatic mandibular first premolar (bridge abutment) with a "C" shape root canal system. Most C-shaped canals occurs in mandibular second