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Introduction: Talon cusp is an uncommon developmental anomaly which is characterized by the presence of an extra cusp-like structure projecting from the cingulum area of maxillary or mandibular incisors. It consists of enamel, dentine with or without pulp tissue. Its aetiology is still unknown; however, its formation is attributed by the hyperactivity of the enamel organs during the morpho-differentiation stage.
Case Report: A healthy 15-year-old Malay female came to the paediatric dental clinic with the chief complaint of teeth sensitivity. An intra-oral examination revealed presence of a prominent cusp on the lingual surface as well as a deep fissure on the labial surface of mandibular right lateral incisor with a slight degree of mobility due to periapical abscess. An intraoral periapical radiograph revealed a radiopaque projection. The treatment was a root canal.
Conclusions: This case highlights the endodontic treatment of periapical lesions on the mandibular lateral incisor with talon cusp in an adolescent patient. Diagnosis and management of a rare anomaly are essential in the dental practice.
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