成功的根管治疗需借助于X线照片作高度灵巧的手工操作。常规X线片的牙髓腔准确可见度是差的,尤其是前磨牙和磨牙。根、根管或骨结构经常重叠,难于准确地决定解剖情况。在根管诊断和治疗时,对单一部位拍多次X线片,患者所受辐射量就会过多,且常规X线片的曝光和处理过程费时。最近,一种牙科干板摄影法问世,其处理过 Successful root canal therapy requires highly dexterous manual manipulation with the help of radiographs. The exact visibility of the pulp chamber of a conventional X-ray is poor, especially premolar and molars. Root, root canal or bone structure often overlap, it is difficult to accurately determine the anatomy. In the diagnosis and treatment of root canal, a single location for multiple X-ray film, the patient will be exposed to excessive radiation, and conventional X-ray exposure and processing time-consuming. Recently, a dental dry plate photography came out, its treatment