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Interfacial Chemistry of Universal Self etch Adhesives After Prior Dentin Acid etching
Abstract
C.T. TEGERDINE
Self-etch and total-etch adhesives bond composites to enamel and dentin, however, neither is
sufficient to ideally bond to both dental substrates. Selectively total-etching enamel has been
suggested to improve self-etch bonding ability to enamel, but because of its difficulty, prior acid
etching of dentin occurs. Universal self-etch adhesives have been developed to work as total-etch
or self-etch to address this issue. Little is known about the bonding interface of the new products
with acid etched dentin. Objectives: The purpose of this study was to examine the interfacial
chemistry and morphology of a universal self-etch adhesive on dentin and compare how it
performs to a total-etch adhesive. Methods: Fifteen teeth were subjected to prior acid etching
and then applied with Single Bond Plus, Scotchbond Universal (without Rubbing), and
Scotchbond Universal (with Rubbing). Teeth were sectioned and examined using Raman
microspectroscopy, differential Goldner's trichrome staining, and scanning electron microscopy.
Results: Scotchbond Universal showed a significantly thicker interface (one-way ANOVA with
Tukey-Kramer post hoc test, α=0.05), a better penetration profile, and similar hybrid layer
morphology when compared to Single Bond Plus. A rubbing technique was found to be
important for the application of Scotchbond Universal; without rubbing caused the adhesive to
de-bond and separate from dentin. Conclusions: The results suggest that Scotchbond Universal
performed similarly to Single Bond Plus with no adverse effects from prior acid etching. The
clinician does not have to be as accurate when performing selective enamel etching. Funded by
UMKC SOD Summer Scholars Program.