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After debonding the brackets, we found three modes of bond failure in the porcelain specimens under the stereomicroscope. (A) Adhesive remnant index (ARI) 0: no adhesive remnant on the former bracket site. (B) ARI 1: adhesive remnants covering ≤50% of the former bracket site. (C) ARI 2: adhesive remnants covering >50% of former bracket site.
