Fig. 4From: “Determining the efficacy of a machine learning model for measuring periodontal bone loss”Radiographic PBL calculation. Legend: “Lines drawn between CEJ and root apex points represent root length: A1= left root length, A2= right root length. Lines drawn between the alveolar crest and root apex points represent bone height: B1= left bone height, B2= right bone height. PBL was calculated as follows: PBL 1 (%) = (A1-B1/A1) *100. PBL 2 (%) = (A2-B2/A2) *100”Back to article page