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Coexisting Peg-Shaped Lateral Incisor and Hypodontia in a 9-Year-Old Child

Anomaly (Greek, anomalos; irregular) is a deviation from what is regarded as normal, standard, or expected. Disturbance of the epithelium along with mesenchymal interactions markedly alters the normal sequence of odontogenesis, which represents as developmental anomaly of teeth. This is dependent on the developmental stage during which the alteration takes place. Various anomalies could take place, e.g., alteration of number, structure, size, and/or shape. More than 300 genes have been identified in literature that are expressed in teeth responsible for odontogenesis. Defects in any of these genes result in the alteration of the development of tooth. Understanding the etiology of each dental anomaly helps not only in identification but also assists in determining the course of the treatment.