Application of intraoral digital X-ray system for personal identification - A pilot study of a computer network for dental identification in mass disaster victim identification -

为了在法医案件工作中使用口内数字x光设备，必须使固定桌面设备可移动和携带。所有的计算机软件都可以通过笔记本电脑充分发挥作用，但x光片曝光和电路信号同步的机制可能需要调整。使用带传感器的交流适配器进行转换，以允许间接相互阈值水平调整，并对系统进行了测试。附带的软件不允许直接访问Web。为了通过电子邮件传输全口数字x射线图像，将图像导入编辑软件后进行压缩（例如JPEG）。恢复的图像质量较差，特别是在牙髓和骨小梁区域。当分割图像输出时，产生足够质量的图像。在该系统的法医案件工作的另一个应用中，作者开发了一种基于牙根髓的形态计量学分析的年龄估计方法。拔下的第一和第二前磨牙用于本研究。从颊舌和近中远端侧面记录牙髓的数字图像，并在颊面和近中面测量6个水平的根和牙髓宽度。以牙髓与牙根宽度之比为变量进行多元回归分析。第一前磨牙和第二前磨牙的多元回归系数r分别为0.89和0.82。在进一步的研究中，记录了上下犬齿颊舌、45度和中远端牙髓的数字图像，并进行了类似的分析。所有犬的多元回归系数r分别为0.84、0.72和0.78。在实际应用中，仅使用下牙颊舌面牙髓的数字图像来确定牙龄。多元回归系数r为0.71。

To enable use of intraoral digital X-ray facilities in forensic casework, fixed desktop equipment must be made mobile and portable. All computer software will function adequately via a laptop computer, but the mechanism for radiograph exposure and the synchronisation of circuit signals may require adaptation. This conversion was performed, using an AC adapter with sensor to permit indirect mutual threshold level adjustment and the sytem tsted. The accompanying software did not permit direct Web access. To permit transmission of a full mouth digital X-ray image by email, compression (e.g. JPEG) was carried out after importing the image into editor software. The quality of the recovered images was poor, particularly in the areas of the dental pulp and bone trabeculae. Images of adequate quality were produced when segmented images were exported.In an additional application of this system for forensic casework the authors developed an age estimation method based on the morphometric analysis of the dental root pulp. Extracted lower first and second premolars were used for this study. Digital images of the pulp from buccolingual and mesiodistal aspects were recorded and the root and pulp widths measured at 6 levels on both buccal and mesial surfaces. The ratios between the widths of the pulp and the root were used as variables for multiple regression analysis. The coefficient of multiple regression,r, was 0.89 for the first and 0.82 for second premolars. In a further study, digitl images of the pulp in buccolingual, 45-degree and mesiodistal aspects of upper and lower canines were recorded and similarly analyzed. The coefficient of multiple regression, r, was 0.84 for upper, 0.72 for lower and 0.78 for all canines. In a practical application, digital images of the pulp from the buccolingual aspect only of lower teeth were used for dental age determination. The coefficient of multiple regression, r, was 0.71.