我科没有专用摄牙片的Ｘ线机 ,用普通Ｘ线机摄牙片由于没有规范的投照方法参照 ,经常出现所摄的牙片模糊、重叠 ,有的甚至是废片 ,必需重照。这不仅影响诊断 ,而且医患双方都多受Ｘ线照射。为此 ,笔者依据解剖及Ｘ线投照原则 ,并在 2年多的工作中通过 5 6例患者实际投照 ,总结 Our department does not have special radiographs of the X-ray machine, with ordinary X-ray machine due to the lack of standard projection method of reference, often appear to take the teeth fuzzy, overlapping, and some even waste film, . This not only affects the diagnosis, but also that both doctors and patients are exposed to X-rays. To this end, the author based on the principles of anatomy and X-ray projection, and more than 2 years of work through the actual projection of 56 patients, concluded