上颌窦底为牙槽突,有上颌第二前磨牙、第一、二磨牙牙根部所形成的一些隆起,一般窦底前达上颌第一前磨牙的远中,达中切牙者罕见。有的牙根可能突入窦内,与窦腔间可能无骨板相隔而仅为一层粘膜。我们遇到一例,尖牙根和上颌窦腔仅隔一层粘膜,报告如下。 患者女,34岁,22、23因龋病冠折3个月, The maxillary sinus at the end of the alveolar process, the maxillary second premolar, the first, two molars formed by the Ministry of the root some uplift, generally before the maxillary first maxillary first premolar distal, up to the mid-incisors are rare. Some roots may protrude into the sinus, and sinus cavity may be separated by only a layer of mucosa. We encountered a case, canine root and maxillary sinus cavity separated by a layer of mucosa, the report is as follows. Female patient, 34 years old, 22,23 due to caries crown fracture 3 months,