To study the clinical effect of dilatation of the maxillary sinus orifice by placing plastic pipe through it to avoid the maxillary sinus atresia and conglutination of operative antrum after endoscopic sinus surgery(ESS).

• 探讨鼻内窥镜术后用塑料管扩张上颌窦口避免上颌窦口闭塞及术腔黏连的临床效果。