Sagittal view assessing root length (RL), buccal alveolar bone level (BABL) and palatal alveolar bone level (PABL) measurements. Yellow line (RL): from the cementoenamel junction (CEJ) to root apex; Green line (BABL): from the cementoenamel junction (CEJ) to buccal crest; Blue line (PABL): from the cementoenamel junction (CEJ) to palatal crest; Red line Line connecting the cementoenamel junction (CEJ)