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 -

为了能够在法医案件工作中使用口腔内数字X光设备，固定的台式设备必须移动和便携。所有计算机软件都可以通过笔记本电脑充分发挥作用，但射线照相曝光和电路信号同步的机制可能需要调整。这种转换是使用带有传感器的交流适配器进行的，以允许间接相互调节阈值电平和系统测试。随附的软件不允许直接访问Web。为了能够通过电子邮件传输全口数字X射线图像，在将图像导入编辑软件之后进行了压缩(例如JPEG)。恢复的图像质量很差，特别是在牙髓和骨小梁区域。在该系统在法医案件中的另一个应用中，作者开发了一种基于牙根髓形态计量分析的年龄估计方法。以拔除的下颌第一、第二双磨牙为研究对象。从颊舌面和近中远中面记录牙髓的数字图像，在颊和近中面上测量6个水平的牙根宽度和牙髓宽度。以牙髓宽度与牙根宽度之比作为多元回归分析变量。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、下尖牙颊舌、45度和近远端牙髓的数字图像，并进行了类似的分析。上、下、全犬的多元回归系数r分别为0.84、0.72和0.78。在实际应用中，仅从下颌牙齿的颊舌面获取牙髓的数字图像用于牙龄测定。多元回归系数r=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.