Cederberg R A, Tidwell E, Frederiksen N L, Benson B W
Department of Diagnostic Sciences, Texas A & M University System/Baylor College of Dentistry, Dallas, USA.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1998 Mar;85(3):325-8. doi: 10.1016/s1079-2104(98)90017-8.
This study compared the difference in interpretation of the position of endodontic file tips between two imaging systems: photostimulable storage phosphor luminescence imaging versus radiographic film.
Thirteen patients were selected at random. Preoperative and trial file length radiographs were made with a dual image receptor composed of a Digora Digital Imaging Plate and a piece of Ektaspeed Plus film. Exposure techniques for E-speed film were used. Root length and file length measurements were made from digital images with the Digora system's measuring tools. Measurements were also made on radiographic film with a 7 x measuring magnifier. Root length, file length, and their difference were compared for both film and digital images.
Differences were found to be less in digital than in film images. Photostimulable storage phosphor luminescence imaging performed similarly to Ektaspeed Plus film for measuring root lengths, but file tip positions (especially of small file sizes) were difficult to visualize with E-speed film.
The smaller difference between file tip and root apex found with digital imaging suggests that this technique is more accurate to assess trial file length. This imaging modality for assessing file positions during root canal treatment may be beneficial to the practitioner.
本研究比较了两种成像系统在根管锉尖端位置解读上的差异：光激励存储磷光体发光成像与放射胶片。
随机选取13名患者。术前及试锉长度的X线片使用由Digora数字成像板和一张Ektaspeed Plus胶片组成的双图像接收器制作。采用E速胶片的曝光技术。使用Digora系统的测量工具从数字图像中测量牙根长度和锉长度。还使用7倍测量放大镜在放射胶片上进行测量。比较了胶片和数字图像的牙根长度、锉长度及其差异。
发现数字图像中的差异小于胶片图像。光激励存储磷光体发光成像在测量牙根长度方面与Ektaspeed Plus胶片表现相似，但E速胶片难以看清锉尖端位置（尤其是小锉尺寸的）。
数字成像中锉尖端与根尖之间的差异较小，表明该技术在评估试锉长度方面更准确。这种在根管治疗期间评估锉位置的成像方式可能对从业者有益。
