title: Comparison of different irrigants on calcium hydroxide medication removal: microscopic cleanliness evaluation.
abstract: Calcium hydroxide dressing residuals can compromise endodontic sealing. This study evaluated the cleaning efficacy of different endodontic irrigants in removing calcium hydroxide by SEM image analysis. Fifty-four single-rooted mandibular premolars were instrumented to a master apical file #60 and dressed with calcium hydroxide. After 36 hours, the teeth were reopened and Ca(OH)(2) medication was removed by 5 different experimental groups: 0.5% NaOCl (G1), EDTA-C (G2), citric acid (G3), EDTA-T (G4), and re-instrumentation with MAF using NaOCl and lubrificant, followed by EDTA-T (G5). The roots were split in the buccal-lingual direction and prepared for SEM analysis in cervical, middle, and apical thirds (9, 6, and 3mm from the apex). Five blinded examiners evaluated the wall cleanliness using a scale from 1 to 5. Statistical analysis was performed using Kruskal-Wallis at 5% level of significance. Group G5 had the best results in all thirds, with significant statistical differences compared to all other groups in the middle and coronal third, and to G1 in the apical third. On the other hand, G1, only flushed with NaOCl, had the worst results, with statistical differences in all thirds compared to the other groups. The best cleanliness was achieved by G4 and G5 groups. The recapitulation of MAF in combination with irrigants improved the removal of calcium hydroxide medication better than an irrigant flush alone.
authors.affiliation: Department of Endodontics, University of São Paulo-USP, São Paulo, Brazil.
authors.forename: Ricardo Julio Cabrales
authors.initials: RJ
authors.lastname: Salgado
authors.forename: Cacio
authors.initials: C
authors.lastname: Moura-Netto
authors.forename: Andrea Kanako
authors.initials: AK
authors.lastname: Yamazaki
authors.forename: Luciano Natividade
authors.initials: LN
authors.lastname: Cardoso
authors.forename: Abílio Albuquerque Maranhão
authors.initials: AA
authors.lastname: de Moura
authors.forename: Igor
authors.initials: I
authors.lastname: Prokopowitsch
mesh_terms: D001641:Bicuspid; D002126:Calcium Hydroxide; D019343:Citric Acid; D003794:Dental Restoration, Temporary; D004492:Edetic Acid; D006801:Humans; D008855:Microscopy, Electron, Scanning; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D018915:Root Canal Preparation / Q000295:instrumentation*; D012973:Sodium Hypochlorite
chemical_list: D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D019343:Citric Acid; D004492:Edetic Acid; D012973:Sodium Hypochlorite; D002126:Calcium Hydroxide