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A pedigree with five individuals exhibiting bilateral fusion of lower central and lateral incisors is described. It is the first pedigree ever published presenting this condition, and the individuals affected are the 6th through 10th cases in the literature. Bilateral fusion of the lower central incisors may be the consequence of an autosomal dominant gene in this family. Crown height and mesiodistal measurements on the permanent dentition of the affected individuals were compared to the same measurements taken on unaffected persons in their population. Buccolingual and mesiodistal measurements on the deciduous dentition were compared to published means for populations around the world. Fusion was associated with a genetic tendency towards tooth reduction, affecting tooth number in the jaw, and overall size. It also was concluded, as suggested by previous investigators, that fusion and gemination are under separate genetic control. Dental Anthropology 2006;19(1):29-34. is missing, the event is classified as fusion (Pindborg, 1970; Levitas, 1965). This approach is far from perfect since the synchronous presence of gemination, fusion, supernumerary teeth, and congenitally missing teeth could lead to misclassifications. Moody and Montgomery (1934) suggested that the formation of double teeth is under genetic control. Since then, data supporting their hypothesis have continued to mount in human and nonhuman cases. For instance, double teeth have been encountered in a strain of Lakeland terriers (Hitchin and Morris, 1966) and in human twins (Nik-Hussein and Salcedo, 1987; Dixon and Stewart, 1976; Grahnen and Granath, 1961). Trait frequencies vary among populations, being most common among people of Asian and Amerindian origins (Bedy and Moody, 1992; Barac and Skrinjaric, 1991; Skrinjaric and Barac, 1991; Ishida et al., 1990; Salem, 1989; Hagam, 1988; Stevenson, 1983; Brook and Winter, 1970; Pindborg, 1970; Curzon and Curzon, 1967; Grahnen and Granath, 1961; Saito, 1959). There has been disagreement, however, as to the mode of transmission of double teeth. Dixon and Stewart (1976), based on Moody and Montgomery (1934), and Hitchin and Morris (1966) proposed that double teeth may involve Y-linked or holandric transmission. Saito

Inheritance of Bilateral Fusion of the Lower Central and Lateral Incisors: A Pedigree of a Maya Family from Yucatan, Mexico.