Effect of antioxidants after post‐space irrigation on the adhesive interface of glass fiber post cementation

Abstract

ObjectiveThis study evaluated the effects of antioxidants, 10% sodium ascorbate (SA) or 20% alpha‐tocopherol (AT), after post‐space irrigation with 2.5% sodium hypochlorite +17% EDTA (SH) or 1% peracetic acid (PA) on the adhesive interface after glass fiber post cementation.Materials and MethodsSixty bovine roots were endodontically treated. After preparation, the post‐space was irrigated with SH or PA followed or not by the use of antioxidants (SA or AT) (n = 10). Push‐out bond strength test, failure mode, and dentin penetrability analysis using confocal laser microscope were performed in the cervical, middle, and apical thirds. Data from bond strength and dentinal penetrability were evaluated by one‐way ANOVA and Tukey post hoc test (p < 0.05).ResultsSH showed the lowest bond strength regardless of the third (p < 0.05). In apical third, mixed failure was the most incident in all groups. Only in the cervical third of the post‐space, SH‐AT provided the greatest tag extension of the cementation system into dentin (p < 0.05). However, in the middle and apical thirds, SH‐AT, SH‐SA, and PA‐SA provided the largest tag extensions (p < 0.05), but similar to each other (p > 0.05).ConclusionsThe use of antioxidants only favored bond strength when SH was used and dentin penetrability of the adhesive and conventional resin cementation, regardless of the solution used to irrigate the post‐space.Clinical SignificanceThe use of antioxidants (10% sodium ascorbate and 20% alpha‐tocopherol) after post‐space irrigation with sodium hypochlorite appears to increase the bond strength favoring the glass fiber post‐cementation.

Contemporary Concepts of Adhesive Cementation of Glass-Fiber Posts: A Narrative Review

“…In their study, the posts were cemented with a conventional resin cement in combination with an etch-and-rinse adhesive system. The use of the antioxidants after irrigation with NaOCl and EDTA increased the bond strength values, but when peracetic acid was used, the antioxidants had no effect [ 21 ].…”

“…Many cleaning protocols for the root canal space have already been suggested, and some new, more complex methods including antioxidants and laser irradiation have been developed, with promising results [ 21 , 24 , 43 ]. It appears that the use of NaOCl and EDTA followed by chlorhexidine leads to acceptable performance concerning the proper adhesive cementation of a glass fiber post [ 20 ].…”