According to recent research from M Cadenaro and colleagues at the University of Trieste, Italy, “The aim of this study was to analyze the extent of polymerization of different adhesive systems on whitened dentin. One adhesive of each class was investigated: Adper Scotchbond Multi (3M ESPE); One-Step (Bisco); Clearfil Protect Bond (Kuraray); and Xeno III (Dentsply DeTrey).”

Cadenaro and colleagues explained, “Dentin disks were treated with Opalescence Xtra Boost (Ultradent) for 30 minutes and bonded immediately after 24 hours or after 14 days of storage in 100% humidity at 37ºC. Unbleached dentin disks were prepared as controls. The extent of polymerization of bonded interfaces was obtained with differential scanning calorimetry (DSC) at 20, 40 and 60 seconds, and the data were statistically analyzed.”

The researchers concluded, “This study supports the hypothesis that polymerization of the adhesive is reduced after dentin whitening and that delayed adhesive application reverses the polymerization inhibition. Prolonged polymerization intervals may counteract the inhibition of polymerization caused by the whitening procedure. Nevertheless, further in vivo studies should validate this issue.”

Cadenaro and colleagues published their study in the European Journal of Oral Sciences.