Final irrigation protocols can be used to promote stable long-term bond strength of AH Plus to dentin

• Published in: Journal of applied oral science 2023-01, Vol.31, p.e20230005-e20230005
• Main Authors: Tartari, Talita, Wichnieski, Caroline, Silva, Renato Menezes, Letra, Ariadne, Duarte, Marco Antonio Hungaro, Bramante, Clovis Monteiro
• Format: Article
• Language: English
• Subjects: Animals; Cattle; Dental Pulp Cavity; Dentin - chemistry; DENTISTRY, ORAL SURGERY & MEDICINE; Edetic Acid; Etidronic Acid - analysis; Original; Resin cements; Root Canal Filling Materials - chemistry; Root canal irrigants; Root Canal Irrigants - chemistry; Root canal obturation; Root Canal Preparation; Scanning electron microscopy; Sodium Hypochlorite - chemistry; Sodium Hypochlorite - pharmacology; Time factors
• ISSN: 1678-7757; 1678-7765; 1678-7765
• DOI: 10.1590/1678-7757-2023-0005

Irrigation solutions might affect dentin surface characteristics and, consequently, endodontic sealers adhesion. This study analyzed the effect of different final irrigation protocols on push-out bond strength (BS) of AH Plus to dentin seven days and 20 months after obturation. Scanning electron micrographs were obtained from the dentin surface of one sample/group after final irrigation. Canals of bovine incisors were instrumented and received final irrigation with (n=21): G1 - 2.5% sodium hypochlorite (NaOCl) + distilled water; G2 - 2.5% NaOCl + 17% EDTA; G3 - 2.5% NaOCl + 17% EDTA + 2.5% NaOCl; G4 - 2.5% NaOCl + 17% EDTA + 2% chlorhexidine (CHX); G5 - mixture 5% NaOCl + 18% etidronate (HEDP); and G6 - mixture 5% NaOCl + 10% tetrasodium EDTA (Na4EDTA). After irrigation, one root/group was split and images were obtained by scanning electron microscopy (SEM). The other 20 roots/group were filled with only AH Plus sealer. Three slices/root were used for push-out assessment seven days and 20 months after obturation. One-way analysis of variance and Tukey (αG6=G4>G1=G2. G3, G5, and G6 presented values of BS in 20 months similar to the values of seven days (P>0.05). The final irrigation protocols tested produced dentin surfaces with different characteristics. Only G3 and G5 presented high BS values that were stable over time.