The effect of MTAD on the apical leakage of obturated root canals: an electrochemical study

The smear layer was first described by McComb in a scanning electron microscope (SEM) study. The smear layer consists of organic and inorganic substances, including fragments of odontoblastic processes, dentinal shaving, microorganisms, and necrotic materials. Presence of this smear layer prevents penetration of intracanal medication into the irregularities of the root canal system and the dentinal tubules and also prevents complete adaptation of obturation materials to the prepared root canal surfaces. Its removal calls for a combination of irrigating solutions as, presently, one solution cannot dissolve both organic and inorganic debris. Upon the completion of instrumentation, a high volume final flush with ethylene diamine tetra-acetic acid (EDTA) solution followed by NaOCl was found to be most effective in removing The effect of MTAD on the apical leakage of obturated root canals: an electrochemical study