Gnathion (Gn) can be constructed by drawing a line perpendicular to the line connecting which two points?

Gnathion (Gn) is an important cephalometric landmark used in orthodontics and craniofacial analysis. It represents the most anterior-inferior point of the mandible. To accurately construct Gnathion, it is essential to understand the geometric relationships between various craniofacial landmarks.

The correct method involves drawing a perpendicular line to the segment that connects Menton (Mt), the lowest point of the symphysis of the mandible, and Pogonion (Pog), the most anterior point of the symphysis. This line essentially defines the orientation of the mandible in relation to the cranial base and is instrumental in evaluating mandibular positioning.

This construction helps in establishing a consistent reference point for measuring and analyzing facial dimensions, aiding in the diagnosis and treatment planning of dental and orthodontic conditions. Using this specific line ensures that Gnathion is representative of the mandible's most significant functional and aesthetic aspects.

Other options, such as the connections involving Infradentale and Gonion or Sella and Articulare, focus on different aspects of the craniofacial structure and do not relate directly to the establishment of Gnathion in the context of mandibular analysis.