title: Artefacts in Cone Beam CT Mimicking an Extrapalatal Canal of Root-Filled Maxillary Molar.
abstract: Despite the advantages of cone-beam computed tomography (CBCT), the images provided by this diagnostic tool can produce artifacts and compromise accurate diagnostic assessment. This paper describes an endodontic treatment of a maxillary molar where CBCT images suggested the presence of a nonexistent third root canal in the palatal root. An endodontic treatment was performed in a first maxillary molar with palatal canals, and the tooth was restored with a cast metal crown. The patient returned four years later presenting with a discomfort in chewing, which was reduced after occlusal adjustment. CBCT was prescribed to verify additional diagnostic information. Axial scans on coronal, middle, and apical palatal root sections showed images similar to a third root canal. However, sagittal scans demonstrated that these images were artifacts caused by root canal fillings. A careful interpretation of CBCT images in root-filled teeth must be done to avoid mistakes in treatment.
authors.affiliation: Department of Dentistry, State University of Montes Claros, Avenue Rui Braga s/n, 39401-089 Montes Claros, MG, Brazil.
authors.forename: Carla Cristina
authors.initials: CC
authors.lastname: Camilo
authors.forename: Manoel
authors.initials: M
authors.lastname: Brito-Júnior
authors.forename: André Luis
authors.initials: AL
authors.lastname: Faria-E-Silva
authors.forename: Alex Carvalho
authors.initials: AC
authors.lastname: Quintino
authors.forename: Adrianne Freire
authors.initials: AF
authors.lastname: de Paula
authors.forename: Antônio Miranda
authors.initials: AM
authors.lastname: Cruz-Filho
authors.forename: Manoel Damião
authors.initials: MD
authors.lastname: Sousa-Neto