Moule A J, Wong A, Monsour P A, Basford K E
Department of Dentistry, University of Queensland.
Aust Dent J. 2001 Jun;46(2):95-9. doi: 10.1111/j.1834-7819.2001.tb00563.x.
The advantage of using a faster film for length determination in endodontic therapy is obvious. However, for such a film to be generally accepted, it must demonstrate comparable diagnostic quality to traditionally used films.
The comparative accuracy of canal length determination of Ultraspeed and Ektaspeed Plus dental X-ray films was assessed in maxillary first and second molars; for different canals, for different teeth, for different exposures, and for different examiners (five general dentists and three endodontic specialists).
In general, there were no significant differences between films, among examiners, or any interaction between films and exposures. That is, an assessor's ability to estimate lengths was not significantly influenced by the film type or by exposure used. There was a wide divergence in the individual assessor's ability to estimate lengths. Specialists estimated lengths more accurately than general practitioners and estimated lengths more accurately with Ektaspeed Plus film. Length determination in distobuccal and mesiobuccal canals was more accurate than in palatal canals. Most palatal canals were underestimated in length by more than 1mm. The use of file sizes larger in number than size 15 is recommended in these canals.
For length determination, Ektaspeed Plus dental X-ray film is as effective as Ultraspeed film. Given the acceptable quality and accuracy of Ektaspeed Plus film, there seems to be no clinical reason to subject patients to greater radiation by using a slower film during endodontic therapy.
在牙髓治疗中使用更快的胶片来确定根管长度的优势显而易见。然而，要使这种胶片被普遍接受，它必须展现出与传统使用的胶片相当的诊断质量。
评估了超快（Ultraspeed）和爱克发速显加强型（Ektaspeed Plus）牙科X线胶片在上颌第一和第二磨牙中确定根管长度的比较准确性；针对不同的根管、不同的牙齿、不同的曝光以及不同的检查者（五位普通牙医和三位牙髓病专科医生）进行评估。
总体而言，胶片之间、检查者之间或胶片与曝光之间的任何交互作用均无显著差异。也就是说，评估者估计长度的能力不受胶片类型或所使用曝光的显著影响。个体评估者估计长度的能力存在很大差异。专科医生比普通从业者更准确地估计长度，并且使用爱克发速显加强型胶片时估计长度更准确。远中颊侧和近中颊侧根管的长度确定比腭侧根管更准确。大多数腭侧根管的长度被低估超过1毫米。在这些根管中建议使用数量比15号更大的锉。
对于长度确定，爱克发速显加强型牙科X线胶片与超快胶片一样有效。鉴于爱克发速显加强型胶片可接受的质量和准确性，在牙髓治疗期间似乎没有临床理由让患者因使用较慢的胶片而接受更大剂量的辐射。
