Regional odontodysplasia: A case of progressive tooth develo
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Regional odontodysplasia (RO) is a relatively rare nonhereditary dental anomaly typically affecting one or several contiguous teeth in one quadrant of maxilla or mandible, not crossing the midline. The teeth affected may be either primary or permanent or both. Radiographically, the affected teeth have a "ghostlike" ("ghost teeth") appearance due to poor mineralization of enamel and dentin surrounding wide pulp chamber and root canal with wide apical foramen.

An 18-year-old white male was referred to the division of oral and maxillofacial radiology for radiographic assessment of asymptomatic, discolored teeth. On clinical examination, the mandibular left first and second molars, first and second premolars, right and left canines (Teeth #s 18-22, 27) appeared slightly discolored with irregular surfaces.

The mandibular central left and lateral incisors were missing. The soft tissues showed normal color and texture. On periapical radiographs, the clinically discolored teeth appeared to have an irregular, hypoplastic occlusal enamel surface.

The pulp chamber and root canals of the affected teeth appeared slightly larger compared to the rest of the dentition. There were faint vertical radiolucent lines in the radicular dentin running parallel to the root canals in the affected teeth. The radiographic distinction between the coronal enamel and dentin was minimal in the involved teeth.

Comparisons were made with pre-existing radiographs taken 4 years ago in 2007. A prominent difference between these and current radiographs was the significantly larger pulp chambers and root canals with minimal circumpulpal dentin-enamel cover noted in the older radiographs, showing progressive normalization of anatomy of the affected teeth over a period of 4 years.

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