Prevalência de canais não obturados em molares e sua associação com a presença de lesões periapicais: estudo em tomografia computadorizada de feixe cômico

Abstract

The negligence of the anatomical root variations by professionals have been contributed to the high incidence of untreated canals, leading to failures in endodontic treatment. The aim was to evaluate the prevalence of untreated canals in endodontically treated maxillary molars through cone beam computed tomography (CBCT) images and to verify the association of these with the presence of periapical lesions. 633 maxillary molars were evaluated in CBCT exams (axial, sagittal and coronal slices) from a database by three oral radiologists. Descriptive statistical analysis showed that among 395 first molars, 218 had at least one untreated canal. Among 238 second molars evaluated, 121 presented at least one untreated canal. Among 395 first molars, 186 (46.5%) had some untreated canal and periapical lesion simultaneously. Of these, 72.4% (134) of the untreated canals were only mesiobuccal 2 (MB2). Among 238 second molars, 104 (43.6%) had some untreated canal and periapical lesion simultaneously. Of these, 81.7% (85) of the untreated canals were only MB2. The chi-square test showed an association between the presence of untreated canal and periapical lesion for first (p <0.001) and second (p = 0.04) maxillary molars. Teeth that presented some untreated canal had 2.57 times more chances (OR) of presenting association with periapical lesion (p <0.001). It was concluded that MB2 was the most frequently untreated canal, being associated with the presence of periapical lesion in endodontically treated teeth.