Postoperative pain after one-visit root-canal treatment on teeth with vital pulps: comparison of three different obturation techniques - Alonso-Ezpeleta, L O; Gasco-Garcia, C; Castellanos-Cosano, L; Martín-González, J; López-Frías, F J; Segura-Egea, J J (Med Oral Patol Oral Cir Bucal, 2012)