Both treatments chemically modified the gutta-percha surface. Argon and
Oxygen plasma increased the surface free energy and favored the wettability of AH Plus and Pulp Canal Sealer
EWT. Regarding bond strength analysis, for AH Plus sealer, both plasma treatments on gutta-percha favored
the bond strength to dentin. However, for Pulp Canal Sealer, there is no statistically significant influence. For leakage test, dye penetration occurred between sealer and dentin in all groups. In conclusion, Oxygen plasma led to
both topographic and chemical changes in the gutta-percha surface, while Argon plasma caused only chemical
changes. Both treatments increased the surface free energy, favoring the wettability of AH Plus and Pulp Canal
Sealer EWT sealers and influenced positively in the adhesion and leakage.