resumo
Objective: To compare the long-term microtensile bond strength (mu TBS) to coronal dentin using pre-endodontic dentin sealing (PEDS) and post-endodontic adhesion (PEA) techniques under various endodontic irrigation protocols. Materials and Methods: Ten study groups (n = 10) were established based on the timing of adhesive application (PEDS versus PEA) and irrigation protocol: distilled water (control), 3% sodium hypochlorite (NaOCl), 3% NaOCl followed by 17% ethylenediaminetetraacetic acid (EDTA), 3% NaOCl followed by 17% EDTA and 2% chlorhexidine, and a mixture of 3% NaOCl and 9% etidronic acid (HEDP). Specimens underwent mu TBS testing after a six-month microspecimen aging period. Fracture patterns were analyzed, and adhesive interfaces were assessed using scanning electron microscopy (SEM). Statistical analysis employed a mixed linear regression model with a 5% significance level. Results: PEDS consistently preserved high bond strength across all irrigation protocols (57.4-59.5 MPa), while PEA groups treated with endodontic irrigants resulted in significantly lower values (33.3-40.8 MPa; p < 0.001). No significant differences were observed within the PEDS groups (p > 0.05). SEM analysis revealed consistent hybrid layers in PEDS and PEA/Control groups, while PEA groups treated with endodontic irrigation solutions showed significant resin-dentin interface variations and interfacial gaps. Conclusions: The PEDS technique preserved high and consistent mu TBS regardless of the irrigation protocol, whereas endodontically irrigated PEA groups exhibited significantly reduced bond strength. PEDS offers a predictable approach to optimizing adhesive performance in endodontic-restorative treatments. Clinical Significance: Integrating PEDS into routine endodontic-restorative workflow is recommended to enhance long-term bond strength to coronal dentin. The PEDS technique ensures consistent adhesive performance regardless of the endodontic irrigation protocol, enhancing restorative predictability and treatment success while preserving tooth structure.
palavras-chave
SELF-ETCHING ADHESIVE; SODIUM-HYPOCHLORITE; IN-VITRO; IMMEDIATE; CHLORHEXIDINE; COMPOSITE; IRRIGANTS; AGENTS; PROTOCOLS; ASCORBATE
categoria
Dentistry, Oral Surgery & Medicine
autores
Marques, JA; Falacho, RI; Almeida, G; Caramelo, F; Santos, JM; Rocha, J; Blatz, MB; Ramos, JC; Palma, PJ
nossos autores
João Rocha
Prof. CatedráticoProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials (UIDB/50011/2020, UIDP/50011/2020, and LA/P/0006/2020), financed by national funds through the FCT/MEC (PIDDAC).