人間の歯の陰極線ルミノグラム (第1報)

抄録

According to the results of more than 133 experiments so far done on the cathodo-luminograms of teeth, four types can be recognized, namely -1) a type in which both the corona dentis and the radix dentis show bright red luminescence, called a) type, 2) another type in which the former shows bright red luminescence but the latter gives luminescence belonging to blue tone, called b) type, 3) a special type, say a mixed type of a) and b) i. e. a part of the radix dentis belongs to a) type and another part belongs to b) type, called a) + b) type, and, 4) the fourth type in which the luminogram consists only of luminescence belonging to blue tone, the corona dentis, in this case, being lost by decay.
Of the 133 cases excluding the cases in which c) type occurred, a table showing the number of occurrence of each type of luminogram is given with respect to the positions of the teeth. When Pyorrhoea happened in alveolus, a) or a) + b) type very frequently occurred. The enamel of corona dentis always showed bright red luminescence.
The bright red luminescence shows the presence of traces of Bi in the calcium phosphate base of the teeth and the luminescence belonging to the blue tone indicates the presence of Zn or Cu or both in the same base.