上顎左側第三大臼歯頬側近心部に臼旁結節二個を有する稀有なる一例

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Reports on the supernumerary tubercles of teeth are fairly abundant in the litereture. However, the occurrence of it on the buccal surface on upper 3rd molar has been so far relatively unnoticed, so that the incidence has been estimated to amount to as little as 1.6% according to KITAMURA and even 0% according to UMA. The author report here a case of upper left 3rd molar having two supernumerary tubercles of conical shape found in a male adult subject. The tubercles fused firmly with the main tooth, and the root of tubercles fused with the root of mesio-buccal of the 3rd molar tooth. An apical foramen is present in the root end. Radiographical examination revealed that the tubercles has a pulp cavity but not a root canal of their own, except the presence of a mesio buccal root canal of the main 3rd molar tooth serving as commonone. The author is of the opinion that the supernumerary tubercles would have their origin in the local excessive growth of the theory of reca pitulation.
九州歯科学会の論文