Morphological significance of root length variability in comparison with other crown dimensions. I. Basic statistics and sex difference.

Materials and MethodsThe materials used for this study were permanent teeth extracted from adult Japanese individuals consisting of 452 males and 76 females.The average number of teeth from one individual was 15.8.The teeth were kept at the Department of Anatomy, University of Tokyo.Parameters for measurement were crown height, buccolingual crown diameter, mesiodistal crown diameter, root length and total length.They were measured with a sliding caliper with an accuracy of 0.05 mm on the basis of Fujita's measuring technique [4].The calculation for statistics was carried out on a HITAC 8800/8700 (OS-7) computer at the Universtiy of Tokyo Computer Center with the aid of the SAS program package.