Resumen de Analysis of a self-adhesive resin cement using immediate or delayed light curing on adhesive/root dentin interface after fiber post cementation
Jéssica Katarine de Abreu Silva, César Augusto Abreu Pereira, Pedro Paullo Alves Gonçalves, Rosana Costa Casanovas, Lucas Portela Oliveira, Cristiane de Melo Alencar, Marcelo Ferrarezi de Andrade, Milton Carlos Kuga
Aim: To evaluate the performance of new self-adhesive resin cement (Megalink Auto, Odontomega Import) using immediate or delayed light curing on adhesive/root dentin interface after fiber post cementation. Methods: Forty human, canine roots were endodontically treated, and the post space was prepared. Specimens were randomized into four groups based on the cement and light-curing timing used (n = 10): RU-I – RelyX U200 (3M ESPE) resin cement with immediate photoactivation after fiberglass post cementation; MG-I – Megalink Auto (Odontomega Import), resin cement with immediate photoactivation after fiberglass post cementation; RU-5 – RelyX U200 (3M ESPE), resin cement with a 5-min delay light-curing timing; and MG-5 – Megalink Auto (Odontomega Import), resin cement with a 5-min delay light-curing timing. Specimens were cross-sectioned (one slice for each third: cervical, middle, and apical) and subjected to push-out and confocal laser microscopy tests. In addition, the fracture mode was analyzed using a stereomicroscope. Kruskal–Wallis tests followed by Dunn's post-test were used to analyze the data (α = 0.05). Results: There was no statistical difference in the bond strength between the groups (p <0.05), regardless of the third analysis. The most insidious failure pattern was adhesive (type 2). There was a statistical difference in the penetrability of the cementation system between the RU-I and MG-5 groups in the cervical and middle thirds (p <0.05). Conclusions: There was no influence of the light-curing time point on bond strength between the dentin and the cementation system, with greater penetrability with immediate light-curing of the self-adhesive resin cement.
