Journal of the Korean Academy of Pediatric Dentistry 2009;36(1):96-101.
Published online February 28, 2009.
Ji-Hee Kim, Byung-Jai Choi, Jae-Ho Lee, Heung-Kyu Son, Seong-Oh Kim, Hyung-Jun Choi
Department of Pediatric Dentistry, College of Dentistry, Yonsei University 
Correspondence:  Ji-Hee Kim,  Tel: 02-2228-8800, Email:
Received: 18 August 2008   • Accepted: 10 November 2008
Regional odontodysplasia(ROD) is relatively rare localized developmental anomaly of tooth formation in which hard tissue is affected. The maxilla is typically affected than the mandible, and especially the maxillary left quadrant is the most commonly involved. Females are affected twice as often as males, and there is no association with race. Its etiology remains undetermined, but local circulatory disorders, somatic mutations, virus infections, local trauma, hyperpyrexia, irradiation, metabolic disturbances, and hereditary transmission are considered as possible etiologic factors. The affected teeth are likely to be small, hypoplastic, brown, and grooved. Eruption failure or delay is frequently seen as well as abscess or fistulae formation in absence of caries. Radiographically, there is a lack of contrast between the enamel and dentin, both of which are less radiopaque than unaffected counterparts. Moreover, enamel and dentin layers are thin, giving the teeth a “ghost-like appearance”. The pulp chambers and canals are large, the roots seem like to be short and indistinct. A 2-year-3-month old boy came to the department of pediatric dentistry, Yonsei University, with the chief complaint of delayed eruption and abnormal tooth shape on the lower left quadrant. He was diagnosed as regional odontodysplasia based on the clinical and radiographic findings.
Key Words: Regional odontodysplasia, Developmental anomaly, Hypoplastic

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