Objective:  Compare dentin and enamel shear bond strengths of 15 self-etching primer (SEP) adhesives to 3 established total etch (TE) adhesives.  Methods:  Embed human teeth in methyl methacrylate and grind proximal surface flat with 320 grit wet sandpaper.  Apply and cure adhesives strictly per manufacturer's instructions.  Pack Z100 (2.39 mm diameter) resin onto adhesive using a Teflon mold.  Thermocycle 5000x between 5 and 55 °C and shear off resin cylinder using notched blade on MTS 810 at 1 mm/min.  Analyze data using GLM & Tukey's HSD multiple comparison procedure (a = 0.05, n=10).  Results:  Numbers in chart are mean bond strength values (MPa) of 10 samples per adhesive per tooth condition.

Conclusions:  All but 4 SEP adhesives had statistically similar dentin and enamel bond strengths compared to TE adhesives tested.  TNB was the only SEP adhesive that had significantly lower dentin bond strength than the TE adhesives and XEN, UNI and OUF are the SEP adhesives that had significantly lower enamel bond strengths than TE adhesives.