Rushton V E, Shearer A C, Horner K, Czajka J
University Dental Hospital of Manchester, England.
Int Endod J. 1995 May;28(3):149-53. doi: 10.1111/j.1365-2591.1995.tb00290.x.
The aim of this in vitro study was to assess the efficacy of 10 currently available methods of producing radiographic images, two conventional and eight rapid, in working length estimation. Thirty extracted teeth comprising 42 root canals were mounted in blocks of poly(methylmethacrylate) and access cavities prepared. A size 15 Hedstrom file was inserted into each root canal and sealed into position. Each tooth was imaged by 10 methods: combinations of conventional (D- and E- speed) film processed with conventional manual chemistry of two proprietary brands of rapid processing chemistry (Westone Rapid Dental and Kodak 'Rapid Access'), Super X30 packet processed film, Hanshin Hi-Fi and Nix NF45-100 films processed using their respective manufacturers' monobath solutions, and the Sens-A-Ray digital X-ray system. Comparisons of length of file visible were made between the D-speed films (conventionally processed using Kodak chemistry) and the nine other radiographic methods. No significant differences in percentage length of file seen were found between D-speed film processed with conventional chemistry and E-speed film processed with the same chemistry or between D-speed film processed with with conventional chemistry and six of the rapid imaging systems studied. The percentage length of the file visible was significantly less for Sens-A-Ray (P=0.02) and for Nix NF45-100 film (P<0.005) when compared with D-speed film processed with conventional chemistry. This difference in file length is probably not of clinical importance for the Sens-A-Ray images but may be so for the Nix images.
本体外研究的目的是评估目前可用的10种制作X线影像的方法（2种传统方法和8种快速方法）在工作长度估计方面的效果。将包含42个根管的30颗离体牙固定在聚甲基丙烯酸甲酯块中，并制备进入腔。将15号Hedstrom锉插入每个根管并密封到位。每颗牙齿通过10种方法成像：用两种专利品牌的快速冲洗化学制剂（Westone Rapid Dental和柯达“快速通道”）的传统手动化学方法冲洗的传统（D速和E速）胶片的组合、Super X30包处理胶片、使用各自制造商的单浴溶液处理的Hanshin Hi-Fi和Nix NF45 - 100胶片，以及Sens - A - Ray数字X射线系统。对D速胶片（使用柯达化学制剂传统冲洗）与其他9种X线摄影方法之间可见锉的长度进行了比较。在用传统化学方法冲洗的D速胶片与用相同化学方法冲洗的E速胶片之间，或者在用传统化学方法冲洗的D速胶片与所研究的6种快速成像系统之间，未见锉的可见长度百分比有显著差异。与用传统化学方法冲洗的D速胶片相比，Sens - A - Ray（P = 0.02）和Nix NF45 - 100胶片（P < 0.005）的锉可见长度百分比显著更低。这种锉长度的差异对于Sens - A - Ray图像可能在临床上并不重要，但对于Nix图像可能如此。
