Fig. 5From: Comparison of the effects on the pharyngeal airway space of maxillary protraction appliances according to the methods of anchorageAnatomic points and areal measurements used in this study. Cv3i indicates the most inferior point of the third cervical vertebra, Hyoid the most superior and anterior point on body of the hyoid bone. 1 SPPA, 2 MPA, 3 IPABack to article page