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Table 1 Reference planes

From: Skeletal stability after 2-jaw surgery via surgery-first approach in facial asymmetry patients using CBCT

Reference planes 
HRP (horizontal reference plane)The plane constructed by connecting both sides of Or and PoRt.
SRP (sagittal reference plane)Perpendicular to HRP passing through Na and Ba
CP (coronal plane)Perpendicular to both the HRP and SRP
MP (mandibular plane)The plane constructed by Me and both sides of Ag