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Dental morphological variation can be considered to fall within two broad categories: (1) those that involve major deviations from the basic dental blueprint and (2) those that involve minor, subtle variations in crown and/or root morphology (Hillson, 1996; Scott and Turner, 1997). Included within the first category are such dental anomalies as supernumerary teeth (polygenesis or polydontia), missing one or more teeth (agenesis or hypodontia), fusion of adjacent teeth, transposition of teeth, rotation of teeth, malposition of teeth, deviations from the “normative” crown morphology (e.g., conical lateral incisors, 3-cusped upper premolars, “mulberry” molars) and other sundry anomalies. The second category of dental variation includes minor variations in secondary cusps, fissure patterns, marginal ridges, supernumerary roots, and so forth (Scott and Turner, 1997:3). Many of the dental anomalies in the first category involve developmental errors in the number and/or positions of individual tooth germs or tooth morphogenic fields. However, the existence of dental morphogenic fields has been debated (Henderson and Greene, 1975). Evidence illustrating an extremely rare form of dental rotation, as well as supporting the presence of a premolar morphogenic field is discussed below.

Brief Communication: Rotation of the Maxillary Premolars: Evidence in Support of Premolar Morphogenetic Field