Histological evaluation after endodontic treatment preceded or not intracanal dressing

Objectives: The scope of this work was to evaluate eficiency of two types of intracanal dressing, comparing with single visit treatment of teeth having pulp vitality. Method:In this experiment, 60 premolar with pulp vitality were used and after biomechanical preparation were filled by classic technique using Sealer Plus completed by lateral condensation; in Group I the root canals were filled with calcium hydroxide intracanal dressing during seven days, in Group II antibiotic/corticosteroid dressing during the same period and Group III without intracanal dressing, After a 90-day period, the animals were sacrificed by anesthethic overdose and had their maxillaries and mandibles removed. The removed parts were fixed in 10% formalin for 48 hours. Results:Following a routine histological process, the cuts were stained by hematoxilin, eosin and Mallory Tricromic. Groups I, II, III were compared 2 by 2 using the non-parametric test of Mann-Whitney. Conclusions:It can be concluded that histological analysis showed no differences between single visit treatment and the two types of intracanal dressing.