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The aim of this study was to evaluate radiopacity, degree of conversion (DC), Knoop hardness (KHN), ultimate tensile strength (UTS) and microtensile bond strength (µTBS) to dentin of an experimental adhesive containing micro-filler of niobium–phosphate bioactive glass (NPG).The NPG glass was produced by fusion of NbO5, Na2CO3, CaO, (NH4)2HPO4 at 1400°C. After cooling, the glass was ground to a mean...