過剩根を有する第1小臼歯の数例に就て

抄録

The author presnts two skulls with bilateral multirooted first bicuspids, on which very few reports have been described so far. Their age and sex are unidentified, but probably they are the adult ones because of their worn surface of the teeth.
The one shows bilateral three-rooted upper first bicuspids and two-rooted lower first bicuspids, wheile the other shows bilateral two-rooted lower first bicuspids.
The sizes of these teeth were measured according to “Standnrd of Meafurement of the Teeth” by Fujita.
As a consequence the sizes of these teeth are not so different from the average ones of the bicuspid and excessive formation of the root can be considered as a good, example of “atavism”.