Measurement of the incisive canal length (green line) and anterior maxillary bone thickness at 3 levels (yellow, orange & pink lines).

<p>Measurement of the incisive canal length (green line) and anterior maxillary bone thickness at 3 levels (yellow, orange & pink lines).</p

Sagittal view shows the typical appearance of a (a) flat and (b) concave alveolar maxillary bone labial to the incisive canal.

<p>Sagittal view shows the typical appearance of a (a) flat and (b) concave alveolar maxillary bone labial to the incisive canal.</p

Measurement of incisive foramen (blue line), nasal foramen (red line), incisive diameter (green line), and the incisive foramen location (yellow line).

<p>Measurement of incisive foramen (blue line), nasal foramen (red line), incisive diameter (green line), and the incisive foramen location (yellow line).</p

Differences in average anterior maxillary bone thickness between those aged above and below 45 years.

<p>* Independent <i>t-test</i>.</p><p>Differences in average anterior maxillary bone thickness between those aged above and below 45 years.</p

Distribution showing alveolar bone shape anterior to the incisive canal in subjects of different gender and ethnicity.

<p>Distribution showing alveolar bone shape anterior to the incisive canal in subjects of different gender and ethnicity.</p

Representative images showing different classifications of the direction and course of the incisive canal.

<p>Representative images showing different classifications of the direction and course of the incisive canal.</p