Guided Cavity Preparation to Access an Invagination and Preserve Pulp Vitality of an Immature Maxillary Lateral Incisor With Type <scp>IIIa</scp> Dens Invaginatus: Technical Overview and a Case Report With 3‐Year Follow‐Up

A 9-year-old male presented with a palatal sinus tract associated with immature tooth 22. Based on clinical and radiographic examination, a type IIIa DI with a pseudo-foramen midway along the mesial aspect of the root was identified. The tooth had a healthy pulp and peri-invagination periodontitis. A guided endodontic cavity was prepared to selectively access the invagination without compromising the pulp and the invagination filled with a bioceramic calcium silicate-based material. At 36 months the tooth was asymptomatic, and the pulp tested positive. Radiographically, root development was complete with bony healing of the lesion. This case report highlights the effectiveness of guided cavity preparation to access an invagination in an immature tooth with DI while preserving pulp vitality.