Abstract
A case of bilateral dwarf wisdom teeth in upper jaw was found in one of the craniums collected by the Anatomical Department of Kyushu Dental College Both teeth were comparatively long in length, but their crown were unusually small in bucco-lingual as well as in mesio-distal diameters, giving rise to bud-like shape, and were topped with three cusps. The cusps of the right tooth were differently arranged from those of normal teeth in that one cusp seated on the labial side and the other two cusps seated on the lingual side. The roots of both teeth were of slender conical shape with no branching. However the root of right tooth had a deep groove running longitudinally and set aside a little distally on the labial surface, whereby the root was imperfectly separated. The root of left tooth lacked groove and was purely single-rooted. The second molar was normal in the contour and the first molar was missing, making unable to compare the three molars as to their developmental stages. However in view of the apparent improbability that the degree of retrogrssion from the first to the second molar may be severe, such a sudden retrograde change and dwarfism shown in the third molar, especially in both sides of the dental arch, would be most interesting phenomenon. The wisdom teeth in lower jaw were normal in respect to their degree of retrogression.
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