Topographic relationship of impacted third molars and mandibular canal: correlation of panoramic radiograph signs and CBCT images

• Main Authors: Eduardo Luiz Delamare, Gabriela Salatino Liedke, Mariana Boessio Vizzotto, Heraldo Luis Dias da Silveira, Tais Weber Furlanetto de Azambuja, Heloisa Emilia Dias da Silveira
• Format: Article
• Language: English
• Published: Universidade Estadual de Campinas 2015-10-01
• Series: Brazilian Journal of Oral Sciences
• Subjects: Radiography; Tomography; Third molar
• Online Access: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8641395

Aim: This study evaluated the proximity and relation of impacted lower third molars and mandibular canal on panoramic radiography. Methods: Radiographic signals associated with proximity of structures and Pell & Gregory and Winter classifications of 78 impacted teeth were analyzed and compared with CBCT images (gold standard). The associations between the findings were tested with Pearson’s chi-square. Results: Direct contact between structures was observed in 85% of cases of radiolucent band over roots. Conclusions: Radiolucent band over roots is the image more associated with direct contact between structures and the one that indicates lingual positioning of the canal more consistently. Some categories of Pell & Gregory and Winter classifications suggested signs of the topographic location of the mandibular canal.