The Tubercle of Carabelli in the Kish Dentition, Mesopotamia, 3000 B.C

Abstract

is situated on the lingual surface opposite the anterointernal cusp of the upper perma-nent molars. Sicher ' described the tubercle as an "accesory cusp. " The tubercle appears in varying sizes from a well-developed cusp to a depressed grooving on the same loca-tion. The cusp is generally found on the upper first molars and very rarely on the third molars. The tubercle, when found on the second molar, does not present the same degree of prominence as its mesial counterpart. Its presence has been generally observed as bilateral and rarely unilateral. Bolk2 observed that the tubercle frequently occurred on the deciduous second molars. Considerable investigation has been done on the incidence, morphology, and evolu-tionary significance of Carabelli's cusp. Reports written by previous investigators have been valuable in the analysis of the incidence of the cusp in the Kish dentition (Table 1). The purpose of this paper is to present information concerning the role of the tubercle of Carabelli in the Kish molars from the evolutionary point of view and as a racial characteristic in tooth morphology. Adloff3'4 observed the cusp in Krapina molars. He concluded that it is a primitive

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