The opening into the maxillary sinus is probed with a curved suction, and any disease or secretions are removed.The meatotomy is then completed using retrograde forceps.

• 用弯吸引器经窦口插入上颌窦内，以清除窦内病变和脓性分泌物，再用反张钳完成上颌窦口扩大术。