Adhesion of various adhesive resin cements to RelyX Fiber Post

Objectives: The purpose of this in vitro investigation was to evaluate the bond strength of self adhesive and adhesive resin cements to RelyX™ Fiber Post, a new glass fiber reinforced composite post (RXFP, 3M ESPE).

Materials and methods: RelyX™ Unicem Aplicap™ self adhesive universal resin cement, (RXU, 3M ESPE) and an experimental self adhesive paste/paste material (EXP; 3M ESPE), Maxcem™ (MC, Kerr) as well as Variolink^® II (VAR) and Multilink^® Automix (MUL, both from ivoclar vivadent) were used in combination with RXFP (size 3). Except for MUL and VAR the fiberpost was not pre-treated. In case of MUL and VAR Monobond-S (MON, ivoclar vivadent) was used to silanize the post surface. Cements were light-cured (LC) or dark-cured (DC). Adhesion was tested on the conical part of the fiberposts and measured in a pull-off setup using an universal testing machine (Zwick Z010, crosshead speed 1mm/min). Data obtained from the different groups were analyzed using ANOVA.

Results: The following table summarizes the mean adhesion values. Groups with no statistical significant difference are marked with the same character (Upper case: row / Lower case: column).

Conclusion: RXU self adhesive universal resin cement and experimental self-adhesive paste/paste material showed best performance in both curing modes without any surface pre-treatment, whereas MC and MON&MUL were found to have significantly lower bond strength when the dark cure mode was used.