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The Journal of Adhesive Dentistry
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J Adhes Dent 17 (2015), No. 6     18. Dec. 2015
J Adhes Dent 17 (2015), No. 6  (18.12.2015)

Page 513-519, doi:10.3290/j.jad.a35254, PubMed:26734675


Does Making An Adhesive System Radiopaque by Filler Addition Affect Its Bonding Properties?
Martins, Gislaine Cristine / Reis, Alessandra / Loguercio, Alessandro D. / Zander-Grande, Christiana / Meier, Marcia / Mazur, Rui Fernando / Gomes, Osnara Maria Mongruel
Purpose: To evaluate the radiopacity, bond strength, and micromorphology of experimental filled dental adhesives.
Materials and Methods: Five experimental filled dental adhesives with different concentrations of radiopaque barium-borosilicate glass (wt%) [0 (R0), 30 (R30), 40 (R40), 50 (R50), and 60 (R60)] and the commercial adhesive Adper Single Bond 2 were used in this study. Specimens were prepared by dispensing the uncured resin into a mold (5.0 mm x 1.0 mm). Digital radiographs (n = 5) of both 1-mm-thick adhesive specimens and tooth were taken with a CCD sensor. The gray levels of enamel, dentin, and adhesive systems were measured by histogram analysis and compared. Adhesives were applied to flat dentin surfaces of third molars (n = 7). Resin composite buildups were constructed and sectioned to obtain resin-dentin bonded sticks to test immediately or after 6 months of water storage. Three specimens for each tooth were qualitatively analyzed using scanning electron microscopy. Data on bond strength and radiopacity were evaluated by two-way and one-way ANOVA, respectively, and Tukey's test (α = 0.05).
Results: All experimental filled dental adhesives showed radiopacity similar to enamel (p > 0.05) and most yielded significant reductions of bond strength over time. However, the R30 produced a radiopaque material without jeopardizing the bonding of the material to the dentin substrate.
Conclusions: The addition of 30% barium-borosilicate oxide produced radiopaque adhesives without jeopardizing the bonding to the dental substrate.

Keywords: radiopacity, filler particles, dentin bonding agents, dental bonding, adhesive