• 1.       Sphenoid Plane Line: Draw a horizontal line through the two points where the sphenoid contacts the outer rim of the orbit. 
  • 2.       Temporal Plane Line: Draw a horizontal line through the two highest points on the petrous portion of the temporal bones. 
  • 3.       Mastoid Plane Line: Draw a horizontal line through the two lowest points on the mastoid bones.  
  • 4.       Malar Plane Line: Draw a horizontal line through the two lowest points on the inferior border of the malar bone. 
  • 5.       Atlas Plane Line: Draw a horizontal line through the two lowest points on the lateral masses of the atlas vertebra. 



Dental Orthogonal Radiographic Analysis

Drawing 5 Planar Lines