Rami gingivales superiores

例句：

1. 1.The patient's upper jaw was severely injured during the accident.
   病人的上颌在事故中严重受伤。
2. 2. The dentist performed a root canal treatment on the patient's upper jaw.
   牙医为病人的上颌进行了根管治疗。
3. 3. The patient's upper jaw had to be removed due to severe infection.
   由于严重的感染，病人的上颌不得不被切除。