Kazzi D, Horner K, Qualtrough A C, Martinez-Beneyto Y, Rushton V E
The School of Dentistry, University of Manchester, Higher Cambridge Street, Manchester, UK.
Int Endod J. 2007 Jul;40(7):526-31. doi: 10.1111/j.1365-2591.2007.01251.x. Epub 2007 Apr 24.
To compare the diagnostic quality of endodontic working length estimation films produced using film holders with those taken using the bisecting angle technique and to assess the level of acceptance of film holders by operator and patient.
Five post-graduate and 20 final year undergraduate students attending a UK Dental School produced working length radiographs using either the paralleling or the bisecting angle technique. The paralleling group used one of two film holders, the Endoray II or the XCP Endodontic Instrument, on alternate patients. An assessment of the ease of use of the device and the patients' views on the comfort of the examination were recorded. Each radiograph was examined simultaneously by two assessors, scored for film faults and diagnostic acceptability. Statistical data was derived using the Mann-Whitney U test and Cohen's kappa.
The rates of unacceptable radiographs for the XCP Endodontic Instrument, Endoray II and the bisecting angle techniques were 12.2%, 21.4% and 48.6%, respectively. The combined percentage of unacceptable paralleling technique films (16.7%) was highly significantly different (P < 0.001) when compared with the bisecting angle technique (48.6%). The paralleling technique produced a significant reduction in incorrect vertical angulation (P < 0.001), cone cutting (P < 0.001) and incorrect film placement (P < 0.001). Film holders were rated either excellent or good in 90% of examinations by operators and 47.5% of patients reported no discomfort.
These results support the use of the film holders for endodontic working length estimation.
比较使用胶片夹拍摄的根管工作长度测量片与采用分角线投照技术拍摄的片子的诊断质量，并评估操作者和患者对胶片夹的接受程度。
英国一所牙科学院的5名研究生和20名本科最后一年的学生，分别采用平行投照技术或分角线投照技术拍摄工作长度X线片。平行投照组在交替的患者中使用两种胶片夹之一，即Endoray II或XCP根管器械。记录对设备易用性的评估以及患者对检查舒适度的看法。每张X线片由两名评估者同时检查，对胶片缺陷和诊断可接受性进行评分。使用曼-惠特尼U检验和科恩kappa统计得出数据。
XCP根管器械、Endoray II和分角线投照技术的不可接受X线片发生率分别为12.2%、21.4%和48.6%。与分角线投照技术（48.6%）相比，不可接受的平行投照技术胶片的综合百分比（16.7%）有极显著差异（P<0.001）。平行投照技术在垂直角度错误（P<0.001）、锥形切割（P<0.001）和胶片放置错误（P<0.001）方面有显著降低。在90%的检查中，操作者对胶片夹的评价为优秀或良好，47.5%的患者表示无不适感。
这些结果支持使用胶片夹进行根管工作长度的测量。
