半面短小下牙槽神经管解剖位置的影像学评估.

Objective To explore the anatomic course of inferior alveolar nerve canal in patients with hemifacial microsomia. Methods In this retrospective study, 153 patients with hemifacial microsomia from November 2014 to October 2021 were included. All patients were divided into 4 types according to the Pruzansky-Kaban classification. The data of cranial CT scans were imported into Mimics 19.0 software for three-dimensional reconstruction. The anatomic location of entrance, course and exit of bilateral inferior alveolar nerve canal were delineated. The differences between affected and unaffected side were compared by two-sided Fisher's exact test. The relationship between the variation of inferior alveolar nerve canal and the severity of mandibular deformities was analyzed by Cochran-Armitage trend test. Results In all patients, there were 14 cases of type Ⅰ (9.2%), 84 cases of type Ⅱa (54.9%), 36 cases of type Ⅱb (23.5%) and 19 cases of type Ⅲ (12.4%). There was no significant difference in the anatomic location of inferior alveolar nerve canal between the affected and unaffected side in type I and Ⅱa hemifacial microsomia. There was significant difference in the entrance, anatomic course and exit of inferior alveolar nerve canal in type Ⅱb and type Ⅲ hemifacial microsomia (P<0.05) . The higher the degree of the mandibular deformity was, the higher the incidence of inferior alveolar nerve canal variation was (P<0.05). Conclusion Variations of the anatomic course of the inferior alveolar nerve canal existed in type 域b and type Ⅲ hemifacial microsomia, and the imaging evaluation is recommended before surgical intervention. [ABSTRACT FROM AUTHOR]