Effect of EDTA Gel on Residual Subgingival Calculus and Biofilm: An In Vitro Pilot Study.

A 25% neutral EDTA gel was applied after SRP severely disrupted the residual biofilm and altered the character of dental calculus and the smear layer as shown by reductions in the Weight % and Atomic % for N, F, Na, and S and increases in Mg, P, and Ca.