Journal of Dental Research, Vol 55, 625-627, Copyright © 1976 by International & American Associations for Dental Research Online Journals
Patterns of crowding of permanent mandibular incisors before eruption
K. Kindaichi
Observation of the radiographs taken of 37 mandibles from children ten
months to seven years of age showed that the unerupted, permanent
mandibular central incisors were rotated in 45 of 74 jaw halves (60.8%).
The type of rotation in which the mesial aspect is directed lingually was
most commonly seen (44.6%). The next most common observation was of jaw
halves without any rotation of the central incisor (39.2%). The type of
rotation in which the central incisor's distal aspect is turned lingually
was the least common observation (16.2%). The rotation seemed symmetric in
25 jaws (67.6%).