Fig. 4

A Bucco-palatal section of canine CBCT scan with the defined landmarks for measurements in red. B Schematic representation of the reported measurements. Alveolar bone height: buccal (a) and palatal (b) alveolar crest heights were measured as the vertical distances between the line passing through the buccal and palatal CEJ to the corresponding buccal and palatal alveolar crest. Alveolar bone thickness: buccal and palatal alveolar plate thicknesses were measured perpendicular to the long axis from the root surface to the corresponding buccal and palatal alveolar bone plate at two different distances from the CEJ: 3 mm (c, d) and 6 mm (e, f). Root length was measured as the distance (g) along the long axis of the tooth perpendicular to two reference lines, the first line passing through the buccal and palatal CEJ of the canine and the other line through the canine root apex