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4 Essential Orthodontic Clinical Concepts   Alignercue.com When analyzing the upper airway on lateral cephalograms, orthodontists rely on specific 2D landmarks to assess patency and obstruction risks. Ten essential points include: – **Sella (S):** Midpoint of the pituitary fossa. – **Nasion (N):** Frontonasal suture junction. – **Posterior Nasal Spine (PNS):** Tip of the hard palate. … Read more