Effect of experimental silane-based primers with various contents of 2-hydroxyethyl methacrylate on the bond strength of orthodontic adhesives

Aim To evaluate in vitro the effect of different concentrations of 2‐hydroxyethyl methacrylate (HEMA) in experimental silane‐based primers on shear bond strength of orthodontic adhesives. Methods Different volume percentages of HEMA were tested in four experimental silane‐based primer solutions (additions of HEMA: 0, 5.0 vol%, 25.0 vol% and 50.0 vol%). An experimental silane blend (primer) of 1.0 vol% 3‐isocyanatopropyltrimethoxysilane (ICMS) + 0.5% bis‐1,2‐(triethoxysilyl) ethane (BTSE) was prepared and used. The experimental primers together with the control group were applied onto acid‐etched premolars for attachment of orthodontic brackets. After artificial aging by thermocycling the shear‐bond strength was measured. The fractured surfaces of all specimens were examined under scanning electron microscopy (SEM) to evaluate the failure mode on the enamel surface. Results The experimental primers showed the highest shear‐bond strength of 21.15 MPa (SD ± 2.70 MPa) and with 25 vol% showed a highly significant increase (P