Table 2 General interpretations of PCA and FA loadings.

PCA

   PC1

all maxillary teeth and mandibular premolars and molars

   PC2

molars vs. non-molars

   PC3

premolars vs. non-premolars

   PC4

mandibular teeth vs. maxillary teeth

   PC5

2^nd molars vs. mandibular 1^st molars

   PC6

mandibular premolars and 2^nd molars vs. mandibular 1^st molar and maxillary molars and 2^nd premolar

   PC7

maxillary premolars and mandibular molars vs. maxillary molars and mandibular premolars

   PC8

complex contributions

   PC9

complex contributions

   PC10

right vs. left mandibular molars

FA

   FAC1

posterior teeth: premolars and molars

   FAC2

maxillary anterior teeth: incisors and canines

   FAC3

mandibular canines and premolars

   FAC4

maxillary premolars

   FAC5

mandibular incisors and canines

   FAC6

non-occlusal premolar and molar surfaces, maxillary lateral incisors, and maxillary canines

   FAC7

tooth 20 (left mandibular 2^nd premolar)

   FAC8

tooth 29 (right mandibular 2^nd premolar)

   FAC9

maxillary 2^nd molars

   FAC10

tooth 13 (left maxillary 2^nd premolar)