Frankfort's horizontal plane

# Frankfort's horizontal plane is formed by joining:
a) Porion and Orbitale
c) Porion and sella
b) Nasion and se lla
d) Porion and Nasion

The correct answer is A. Porion and Orbitale.

FHP or Frankfort horizontal plane =  Formed by joining Porion and orbitale
SN plane or anterior cranial base = Formed by joining nasion and sella
Cranial base length = Nasion and Bolton line
Upper facial height = Nasion to ANS (anterior nasal spine)
Lower facial height = ANS to menton
Total facial height = Nasion to menton


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