Dentin surface roughness vs. bond strength of dentin adhesives.

The effects of differently prepared dentin surfaces on the bond strength mediated by five dentin adhesive/composite resin systems were investigated: Clearfil new bond/Clearfil Ray, Gluma/Lumifor, Scotchbond/Silux, Scotchbond 2/Valux, and Tenure/Silux. Bonding surfaces were produced either by wet-grinding of human teeth on SiC paper, grits 180, 240, 320, 400, 600, and 4000, respectively, or by cutting them with dental preparation instruments. The surfaces of the dentin were analyzed by a profilometer. Tensile bond strengths (TBS) were determined two min after light activation of the restorative systems. In spite of greatly different effective areas for bonding, ANOVA showed no significant differences on the 5% level between the TBS means of one material system recorded for the different dentin preparations. It was concluded that the dentin roughness produced by preparation has no significant influence on early bond strengths of bonding composite resin systems.