Journal of Clinical Pediatric Dentistry, cilt.49, sa.5, ss.66-76, 2025 (SCI-Expanded, Scopus)
Background: To assess the efficiency of various irrigation techniques employed for eliminating smear layer removal (SLR) in primary tooth root canals following the use of both rotary and hand instrumentation systems using scanning electron microscopy (SEM). Methods: 80 extracted maxillary primary incisors were randomly divided into two main groups: the Easy in Smile X Baby Rotary File Group (ESXF Group) (n = 40) and the K-type Hand File Group (K-File Group) (n = 40). Subsequently, the main groups were divided into four subgroups randomly: one treated with a 5% Ethylene Diamine Tetra Acetic Acid (EDTA) solution, another with 6% (Citric Acid) CA, a third with 1% (Sodium Hypochlorite) NaOCl, and a control group that received 0.9% (Physiological Saline) PS. Following the irrigation procedures, an SEM analysis was performed on three specific areas of the root canal: the coronal, middle, and apical. The data collected underwent statistical analysis using different tests like Friedman’s, Mann Whitney U, Kruskal Wallis, and Dunn’s, with a significance level of 5%. Results: In both instrumentation groups, EDTA and CA showed superior efficacy compared to the others on all root canal thirds (p < 0.05) and no difference was observed between EDTA and CA (p > 0.05). However, erosive defects were seen in both groups for EDTA, especially in coronal third, were not seen in CA subgroups. Also, all irrigants were less effective in apical third. There was also no statistical difference between ESXF and K-File groups for each irrigant (p > 0.05). Conclusions: Due to its comparable efficiency to 5% EDTA in terms of SLR and lack of erosive properties, 6% CA is a suitable choice for pulpectomy procedures in primary teeth when using rotary systems.