Abstract: Objective To investigate extraction of non-metal foreign bodies under ultrasound guidance in oral and maxillofacial trauma. Methods B ultrasound was used to locate 22 cases of maxillofacial non-metal foreign bodies and then surgical extraction was performed. Result Among all 22 cases, 20 were successfully located and extracted under B ultrasound guidance, and in 2 cases, foreign bodies failed to be found and were extracted with MRI examination. Conclusion Ultrasound can accurately locate non-metal foreign bodies, which is very important to clinical treatment and planning operation.

Key words: oral and maxillofacial trauma, Foreign body, Ultrasound diagn osis