Korean J Orthod.  1981 Dec;11(2):125-134.

A study on the calcification of second molars in skeletal Class II malocclusion

• Kim YM

Abstract

To study the calcification of second molars in skeletal class II malocclusion, the author examined cephalograms, orthopantomograms, periapical films of 391 children from 7y 0m to.15y 11 m years old who had skeletal class II malocclusion, and observed the difference in the calcification stage between upper and lower second molars. The results areas follows. 1. The mean ages of crown completion of upper and lower second molars are 8.7 +/- 1.75, 8.8 +/- 1.13 in. boys, and 8.4 +/- 0.81, 8.5 +/- 0.91 in girls. 2. The mean ages of root completion of upper and lower second molars are 14.0 1.09, 14.5 +/- 0.52 in boys, and 13.7 +/- 1.15, 13.8 +/- 1.18 in girls. 3. The calcification stages of upper second molars are more advanced than those of lower second molars at 5% level in both sexes.

MeSH Terms

Child
Crowns
Female
Humans
Malocclusion*
Molar*