A New Method for Dental Identification by Component Analysis of Dental Porcelain Using Energy Dispersion X-ray Fluorescence Spectrometer

本研究的目的是建立牙科陶瓷的能量色散X射线荧光光谱仪成分分析方法，为牙科鉴定提供依据。由于光谱仪只能通过扫描瓷面来采集数据，因此这项技术是无损的，这在法医情况下是很有好处的。最初，14个设计用于烤瓷熔附冠表面再现的瓷样作为试验处理，以建立常规的分析方法。以6个生产厂家的11个产品，共76个样品作为对照样品。要求每家公司的技术人员仅使用6种瓷器产品，在A3色调下制作金属烤瓷全冠。通过简单的定性分析，在对照瓷样中检出20种元素，不同厂家所用元素的比例不同。通过校准曲线的定量分析表明，表面瓷主要由硅(Si)、铝(Al)和钾(K)组成，重量组成在55-70%Si、10-17%Al和7-12%K之间。11种产品的重量组成存在差异，特别是硅和锆的含量。定性和定量分析结果相结合，正确识别了所有6家制造商的名称。在11个样本中，只有4个能够正确识别每个制造商的单个样本。从金属烤瓷冠表面检测到的元素组成和能量峰与建筑中使用的每一种瓷器准确对应。牙科瓷器的成分分析将成为辅助牙科鉴定的有效手段。

The aim of this study was to develop a method of component analysis of dental porcelain by energy dispersion x-ray fluorescence spectrometer, for application in dental identification. As the spectrometer can gather data by scanning the porcelain surface only, this technique is non-destructive, which is of great benefit in forensic situations.Initially, 14 porcelain samples, designed for crown surface reproduction on porcelain fused metal crown, were processed as a trial to establish a routine for analysis. Eleven (11) products from 6 manufacturers, 76 samples in total, were used as the control samples. The technicians from each company were requested to construct porcelain fused to metal crowns, using 6 kinds of porcelain products only, in shade A3. These acted as the experimental samples.By simple qualitative analysis, 20 elements were detected in the control porcelain samples and the ratios of elements used were different among the manufacturers. Quantitative analysis by calibration curve indicated that the surface porcelains were composed predominantly of Silicon (Si), Aluminium (Al), and Potassium (K), with weight compositions ranging between 55-70% Si, 10-17% Al, and 7-12% K. A difference in weight composition among the 11 products was detected, particularly in the levels of Silicon and Zirconium.The names of all 6 manufacturers were correctly identified from the combined qualitative and quantitative analysis results. It was only possible to correctly identify individual samples from each manufacturer in 4 of the 11 samples. The composition of elements and peaks of energy detected from the surfaces of the porcelain fused to metal crowns corresponded accurately to each of the porcelains used in the construction.Component analysis of dental porcelain will be an effective means of assisting dental identification.