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Unadjusted radiograph number 25 depicting a right first maxillary premolar with a distal infrabony defect. (a) Distance between cemento-enamel junction and bony defect: 9.53 mm. (b) distance between cemento-enamel junction and alveolar crest: 6.64 mm. (c) Infrabony defect: 6.51 mm
