Shear bond strength to moist and dry dentin of four dentin bonding systems

Purpose: To compare the shear bond strength of four single-bottle adhesive systems (Prime & Bond NT, Single Bond, Gluma Comfort Bond, Gluma Comfort Bo nd + Desensitizer) bonded to moist and dry dentin. Materials and Methods: A column of resin-based composite was bonded to human dentin using the denti n bonding systems following manufacturers' directions (n= 12). For half the specimens, the dentin was dried completely after acid etching (air dried f or 10 s). For the remaining specimens, the dentin was left moist (glistenin g appearance with no puddles) after acid etching. All specimens were thermo cycled for 1,000 cycles at 6-60 degreesC, placed in a fixture on an MTS mac hine and loaded in shear until failure. Results: Statistical analysis revea led that dentin condition (moist or dry) was significant for Prime & Bond N T, Single Bond, and Gluma Comfort Bond. Bonding to moist dentin produced hi gher bond strengths than bonding to dry dentin. For Gluma Comfort Bond + De sensitizer, no statistical difference was found between bonding to moist vs . dry dentin. Over all, Single Bond and Gluma Comfort Bond bonded to moist dentin produced significantly higher bond strengths than all other groups.