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Although probably occurring in frequencies similar to those found in modern clinical samples, eruption disturbances are rarely reported from archaeologically derived skeletal series. Several factors lead to this underreporting including lack of recognition by workers unfamiliar with dental anatomy and eruptive processes and the associated fact that low natural occurrence frequencies lead to extreme rarity in the often small population samples anthropologists commonly study. In addition, when eruptive disturbances are found they frequently appear in a single individual so have little evolutionary or predictive value. However, when two eruption disturbances, affecting both mandible and maxilla and different tooth classes, appear in a single individual further investigation and reporting is warranted, particularly when one is considered quite rare by clinical standards. In this short communication I explore a case of lower first molar impaction in an individual from the Ancestral Puebloan Gallina phase of north central New Mexico dating to approximately 750 years ago. This individual also expresses labial ectopic alveolar eruption of the left maxillary canine. According to Pindborg (1970) and Andreasen et al. (1997) impaction of the lower first molar is the rarest of eruptive disturbances with occurrence frequencies reported to be between 0.00 and 0.063 percent (Dachi and Howell, 1961; Kramer and Williams, 1970; Shah et al., 1978; Grover and Lorton, 1985). Because of its rarity, documentation and description of LM1 impaction in an individual from a prehistoric context may shed some light on the etiology of the anomaly and its developmental background. In contrast to M1 impaction, ectopic eruption of maxillary canines is relatively common at least among positional developmental anomalies. The maxillary canine is one of the most frequently malerupted teeth and palatal and labial ectopic eruption is well documented (Pindborg, 1970; Peck et al., 1994; Becker and Chaushu, 2000; Chaushu et al., 2003; Camilleri et al., 2008). In addition, transposition of maxillary canines and third premolars is one of the best documented dental anomalies among prehistoric skeletal series (Nelson, 1992; Burnett and Weets, 2001).

Impacted Lower First Molar and Labial Ectopic Upper Canine Eruption in an Individual from the Prehistoric American Southwest