Four-year water degradation of a total-etch and two self-etching adhesives bonded to dentin

A.I. Abdalla, A.J. Feilzer

    Research output: Contribution to JournalArticleAcademicpeer-review


    Objectives: To evaluate effect of direct and indirect water storage on the microtensile dentin
    bond strength of one total-etch and two self-etching adhesives.
    Methods: The adhesive materials were: one total-etch adhesive; ‘Admira Bond’ and two selfetch
    adhesives; ‘Clearfil SE Bond’ and ‘Hybrid Bond’. Freshly extracted human third molar
    teeth were used. In each tooth, a Class I cavity (4 mm 4 mm) was prepared in the occlusal
    surface with the pulpal floor extending approximately 1 mm into dentin. The teeth were
    divided into three groups (n = 18). Each group was restored with the resin composite ‘Clearfil
    APX’ using one of the tested adhesives. For each experimental group 3 test procedures (n = 6)
    were carried out: Procedure A: the teeth were stored in water for 24 h (control), then
    sectioned longitudinally, buccolingually and mesiodistally to get rectangular slabs of 1.0-
    1.2mm thickness on which a microtensile test was carried out. Procedure B: the teeth were
    also sectioned; however, the slabs were stored in water at 37 8C for 4 years before microtensile
    testing (direct water storage). Procedure C: the teeth were kept in water at 37 8C 4
    years before sectioning and microtensile testing (Indirect water storage). During microtensile
    testing the slabs were placed in a universal testing machine and load was applied at
    cross-head speed of 0.5 mm/min.
    Results: For the 24 h control, there was no significant difference in bond strength between
    the three tested adhesives. After 4 years of indirect water storage, the bond strength
    decreased but the reduction was not significantly different from those of 24 h. After 4 years
    of direct water storage, the bond strengths of all tested adhesives were significantly reduced
    compared to their 24 h results.
    Conclusion: All the tested adhesives showed no reduction in bond strength after indirect
    water exposure for 4 years. After 4-year direct water exposure, the bond produced by all
    tested adhesives was unable to resist deterioration.
    Original languageUndefined/Unknown
    Pages (from-to)611-617
    JournalJournal of Dentistry
    Publication statusPublished - 2008

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