Fig. 4. Measurements of vertical alveolar bone levels (ABLs) and alveolar bone cross-sectional area. A, The yellow points represent the cemento-enamel junction (CEJ), and the green points represent the alveolar bone crest. The labial (La) and lingual (Li) vertical ABLs are defined as LaABL and LiABL, respectively. B, The three levels were separated by 3, 6, and 9 mm from the CEJ. C, LaABA-3 mm (6 mm, 9 mm) and LiABA-3 mm (6 mm, 9 mm) represent the labial and lingual alveolar bone cross-sectional area at 3 mm (6 mm, 9 mm) level, respectively. ABA, alveolar bone area.
