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首页> 外文会议>Conference on Lasers in Dentistry Ⅷ, Jan 20-21, 2002, San Jose, USA >Hollow glass waveguide ― X-ray image in root canal system
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Hollow glass waveguide ― X-ray image in root canal system

机译：空心玻璃波导-根管系统中的X射线图像

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Objective of the study was the evaluation of X-ray image quality of cyclic olefin polymer-coated silver hollow glass waveguide (COP/Ag) in root canal, using a dental digital radiography method for an endodontic treatment. Er: YAG laser system was used. The wavelength generated was 2.94μm and the length of the generated pulses was around 250 μsec. The radiation was delivered to the investigated tissue by a cyclic olefin polymer-coated silver hollow glass waveguide (COP/Ag) with an inner diameter equal to 700 μm and the length of 10 cm. The fluence used in the experiments was in the range of 19 up to 45 J/cm~2. The root canal systems of 10 extracted premolars and molars were treated endodontically using a step-back technique with K-type endodontic files. Isometric X-ray images were captured via fixed-point measurement method. Digital images were taken before treatment, with conventional files and with an insertion of the COP/Ag hollow glass waveguide. A density histogram, characterizing the density spread across the image was established. An aluminum step wedge, 50 mm long x 20 mm wide, having thickness range from 0.5 mm to 5 mm was used as a marker to check the quality of radiopacity. The overall dimensions were adjusted in relation to the sensor size as a control. COP/Ag hollow glass waveguide was slightly visible in root canal system. An isometric image, histogram, and pseudocolor picture help to detect the position of waveguide in the root canal.
机译：该研究的目的是使用牙科数字放射照相法对牙髓进行牙周治疗，以评估根管中环烯烃聚合物涂层的银空心玻璃波导（COP / Ag）的X射线图像质量。 :：使用了YAG激光系统。产生的波长为2.94μm，并且产生的脉冲的长度为约250μsec。辐射通过内径等于700μm，长度为10 cm的环状烯烃聚合物涂覆的银空心玻璃波导（COP / Ag）传输到被研究的组织。实验中使用的注量范围为19至45 J / cm〜2。使用后退技术结合K型牙髓锉对10个拔除的前磨牙和磨牙的根管系统进行牙髓治疗。等距X射线图像通过定点测量方法捕获。在处理之前，使用常规文件并插入COP / Ag中空玻璃波导来拍摄数字图像。建立了密度直方图，以表征分布在图像上的密度。使用厚度为0.5 mm至5 mm的50毫米长×20毫米宽的铝制台阶楔作为标记，以检查射线不透性的质量。相对于传感器尺寸调节整体尺寸作为对照。 COP / Ag中空玻璃波导在根管系统中可见。等距图像，直方图和伪彩色图片有助于检测波导在根管中的位置。

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