Table 2 Model landmarks (Fig. 3A)

cc

cusp tip of the maxillary canine.

mb

mesiobuccal cusp tip of the maxillary first molar.

mp

mesiopalatal cusp tip of the maxillary first molar.

db

distobuccal cusp tip of the maxillary first molar.

dp

distopalatal cusp tip of the maxillary first molar.

CMR

the point that bisects the mb- dp line with mp-db line on the maxillary right first molar.

CML

the point that bisects the mb-dp line with mp-db line on the maxillary left first molar.