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).
|
Cement |
RXU |
EXP |
MC |
MON & MUL |
MON & VAR |
|
Adhesion [MPa] LC |
24,1 ± 1,3 A a |
22,3 ± 2,0 A c |
16,0 ± 0,8 B d |
24,0 ± 1,3 A f |
21,4 ± 1,7 A i |
|
Adhesion [MPa] DC |
19,4 ± 1,9 C b |
21,9 ± 3,1 C c |
2,8 ± 0,8 D e |
3,7 ± 3,3 D g |
3,0 ± 0,7 D j |
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.