Evaluating the Depth of Penetration of Calcium Hydroxide Mixed With Three Different Herbal Essential Oils Using a Confocal Laser Scanning Microscope.

Introduction The goal of endodontic therapy is to completely eliminate the infection and stop microbes from infecting or reinfecting the root canal and the periradicular tissues. Amongst the primary microorganisms,  (), a Gram-positive anaerobe, is the main cause of pulpal and periapical inflammation causing root canal failure. Literature evidence shows that the gold-standard calcium hydroxide is ineffective against due to its resistance to the alkaline pH and proton pump mechanism.