Localization of canine root apex in transverse (1), sagittal (2) and coronal (3) planes. CBCT reference planes (Medial Sagittal Plane, Horizontal Plane, maxillary & mandibular frontal planes ). 
incisive foramen
ANTERIOR, POSTERIOR
Four reference planes were constructed. The median sagittal plane (MSP) was constructed along the anterior nasal spine, the incisive foramen and the posterior nasal spine. The horizontal plane (HP) was constructed perpendicular to the MSP and passing through the Anterior Nasal Spine (ANS) and the Posterior Nasal Spine (PNS). The maxillary frontal plane (FP1) was perpendicular to the MSP and the HP, passing through the incisive foramen. Similarly, the mandibular frontal plane (FP2) was perpendicular to the MSP and the HP, passing through the right and left mental foramina. The planes are shown in 
