磨牙紧邻咽部，采用口内摄片法投照，易引起患者恶心、呕吐等一系列反应。尤其在投照下颌磨牙时，因牙片刺激，致唾液分泌增多，大量的唾液易浸透包片黑纸与胶片发生粘连，投照后若不及时冲洗，胶片上的黑纸就难以除掉，冲洗出来的照片不能使用，导致摄片的失败。特别是没有牙 Molar close to the pharynx, using oral radiographs, easily lead to nausea, vomiting and a series of reactions. Especially in the mandibular molar project, due to tooth stimulation, resulting in increased salivation, a large number of saliva easily soaked in black paper and film adhesions, if not after the vote flushing, the black paper on the film is difficult to get rid of, Rinse out of the photos can not be used, leading to failure of the filming. Especially no teeth