Influence of different adhesive agents on the bond strength of universal fiberglass posts

Abstract

Objective: This study analyzed the bond strength of universal glass fiber posts under different adhesive protocols for surface treatment prior to cementation. Material and Methods: 50 bovine incisor roots were randomly divided into five experimental groups: Group 1 (control): no treatment; Group 2: surface treatment with a 3-step adhesive system (phosphoric acid + Optibond FL etch-and-rinse - KERR); Group 3: conventional 2-step adhesive system (phosphoric acid + Single Bond Universal - 3M); Group 4: 2- step self-etch adhesive system (Clearfil SE Bond); Group 5: 1-step self-etch universal adhesive system (Single Bond Universal - 3M). A single prefabricated fiberglass post (Splendor - Angelus) and self-adhesive resin cement (RelyX U200 ESPE- 3M) were used for all groups. After cementation, the roots were sectioned into 3 thirds (cervical, middle and apical) and subjected to the push-out test at 0.5 mm/mim. The data collected was analyzed, where descriptive statistics, homogeneity test, two-way ANOVA and post hoc Tukey test were presented at a 5% significance level. Results: The mean bond strength by the push-out test was highest in Group 1 (control), with no statistical difference in Groups 2 and 3, followed by the worst result in Group 5, with no statistical difference in Group 4. The worst behavior was shown by Groups 4 and 5 where the load values for fracture were low . Conclusion: The adhesion protocol prior to cementation drastically affects the bond strength.

KEYWORDS

Adhesiveness; Cementation; Dentin adhesives; Dental materials; Post and core technique.