Table 4 Adhesive Remnant Index indicating cement residues on the ceramic surface; ARI 0: no cement residues on the ceramic surface, ARI 1: less than 50% of cement residues on the ceramic surface, ARI 2: more than 50% of cement residues on the ceramic surface, ARI 3: ceramic surface completely covered with cement

From: Effect of two different primers on the shear bond strength of metallic brackets to zirconia ceramic