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一种能量色散x射线荧光光谱仪分析牙瓷成分的方法，用于牙瓷鉴定。由于光谱仪仅通过扫描陶瓷表面来收集数据，因此该技术具有非破坏性，在法医领域具有很大的优势。最初，我们对14个瓷样进行了试验处理，以建立一套分析程序，这些瓷样设计用于瓷熔金属冠的冠面再现。选取6家厂家的11种产品，共76个样本作为对照样本。每个公司的技术人员都被要求在A3阴影下，仅使用6种瓷制品来制作瓷融合到金属冠上。这些作为实验样本。通过简单的定性分析，在对照瓷样品中检出了20种元素，各厂家所使用的元素比例不同。通过标定曲线定量分析表明，所制备的陶瓷表面主要由硅（Si）、铝（Al）和钾(K)组成，其重量组成在55 ~ 70% Si、10 ~ 17% Al和7 ~ 12% K之间，其中硅和锆含量差异较大。结合定性和定量分析结果，正确识别了6家生产企业的名称。在11个样本中，只有4个样本可以正确识别每个制造商的单个样本。从与金属冠融合的瓷器表面检测到的元素组成和能量峰准确地对应于建筑中使用的每种瓷器。牙瓷成分分析将是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.