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Progress in Orthodontics
Fig. 1 | Progress in Orthodontics

Fig. 1

From: Three-dimensional assessment of periodontal support of lower incisors for skeletal Class II malocclusion undergoing presurgical orthodontic treatment with different vertical skeletal patterns

Fig. 1

Alveolar bone volume measurements. A, The tooth model was cut along the cementoenamel junction (CEJ) plane. B, On the CEJ plane, the widest labiolingual distance was defined as reference line 1. Reference line 2 was a line perpendicular to reference line 1 through the midpoint of reference line 1. C, The line from the midpoint of line 1 to the root apex point was the root long axis. D, Reference plane 1 was formed by reference line 2 and the root long axis. The tooth model was separated into the labial side and lingual side by reference plane 1. E, The tooth contour boundary lying on plane 1 was projected perpendicular to plane 1 toward the lingual side using the extrude boundary method. F, The lingual alveolar bone volume model was cut out of the bone digital model by the extruding boundary. G, An example of labial and lingual alveolar bone volume models

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