The talon cusp represents a developmental anomaly in which a peculiar lingual cusp forms on the maxillary or mandibular incisors. When small, the cusp cannot be distinguished from an accentuated cingulum. When well-developed, the cusp appears clinically (Figure 50) and, on a radiograph (Figure 51).
The enamel pearl is a misplaced (ectopic) globule of enamel, occurring most commonly in the furcation areas or near the cementoenamel root surfaces of the molar teeth. Affecting the maxillary more often than the mandibular areas, the relatively rare enamel pearls may contain a dentin core, occasionally with pulpal extension.
Radiographically, the pearl appears as a round or semi-spherical area of increased radiodensity. When occurring on the mesial or distal aspects, the pearl produces an obvious convex profile. On the buccal or palatal/lingual aspects, it is less easily seen and may resemble pulp stones.