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Extra Bonding Layer Compensates Universal Adhesive's Thin Film Thickness.

Mohammed H Ahmed, Chenmin Yao, Kirsten Van Landuyt

    The Journal of Adhesive Dentistry
    |October 19, 2020
    PubMed
    Summary

    Adding an extra bonding layer (EBL) improved the bond strength of some universal adhesives (UAs) in etch-and-rinse and self-etch modes. However, the benefit of EBL varied among the tested UAs after aging.

    Keywords:
    adhesive-dentin interfacebond strengthdurabilityhydrophobiclinear mixed model (LME)

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    Area of Science:

    • Dental Materials Science
    • Adhesive Dentistry
    • Biomaterials

    Background:

    • Universal adhesives (UAs) offer versatile application modes, including 2-step etch-and-rinse (2-E&R) and 1-step self-etch (1-SE).
    • These adhesives often have thin film thickness, potentially limiting their performance.
    • An extra bonding layer (EBL) may enhance UA performance and compensate for thin films.

    Purpose of the Study:

    • To investigate if a highly filled extra bonding layer (EBL) improves the performance of three universal adhesives (UAs).
    • To evaluate UAs in 3-step etch-and-rinse (3-E&R) and 2-step self-etch (2-SE) modes using an EBL.
    • To assess if EBL application compensates for the thin film thickness of UAs.

    Main Methods:

    • Three UAs (Clearfil Universal Bond Quick, G-Premio Bond, Prime&Bond Active) were tested in E&R and SE modes.
    • An extra bonding layer (OptiBond FL_ar) was applied to UAs, creating 3-E&R and 2-SE configurations.
    • Microtensile bond strength (μTBS) to dentin was measured after 1-month water storage and up to 50,000 thermocycles (TC).

    Main Results:

    • The parameters of adhesive type, bonding mode, aging, and EBL significantly affected μTBS.
    • G-Premio Bond and Prime&Bond Active showed improved μTBS with EBL in both E&R and SE modes.
    • No significant differences in μTBS were observed between different bonding modes for most UAs.

    Conclusions:

    • The efficacy of an extra bonding layer (EBL) in enhancing universal adhesive (UA) bonding varied significantly among the tested adhesives.
    • EBL application showed benefits for specific UAs, particularly G-Premio Bond and Prime&Bond Active, in both etch-and-rinse and self-etch modes.
    • The study highlights the nuanced effects of EBL on UA performance under different application modes and aging conditions.