Analysis of Dental Material Components Using Cosine Similarity

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  • Uematsu Yasuaki
    Department of Dental Materials Science, School of Dentistry, Aichi Gakuin University
  • Hori Miki
    Department of Dental Materials Science, School of Dentistry, Aichi Gakuin University Center for Advanced Oral Science, Graduate School of Dentistry, Aichi Gakuin University
  • Kato Akiko
    Center for Advanced Oral Science, Graduate School of Dentistry, Aichi Gakuin University Department of Oral Anatomy, School of Dentistry, Aichi Gakuin University
  • Hayashi Tatsuhide
    Department of Dental Materials Science, School of Dentistry, Aichi Gakuin University
  • Kawai Tatsushi
    Department of Dental Materials Science, School of Dentistry, Aichi Gakuin University Center for Advanced Oral Science, Graduate School of Dentistry, Aichi Gakuin University

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<p>Elemental analysis of a 12% gold-silver-palladium alloy and bovine teeth was conducted by X-ray microanalysis, and the results were transformed into multidimensional vectors. Standard values for a metal material and an inorganic material were also developed from the manufacturers’ declared values and vectorized in the same manner. A cosine similarity search between the vectors of the analysis data and those of the standard values was performed to experimentally ascertain whether it is possible to estimate the origins of the two types of samples, namely the 12% gold-silver-palladium alloy and bovine teeth. The results showed that the cosine similarity to the expected standard values was >99% for the metal sample and exceeded 90% for the bovine teeth, sufficiently demonstrating the potential for accurate origin identification. This method, which expresses the outcome as a single probabilistic percentage output, was found to be highly objective and easy to evaluate in the context of information sharing.</p>

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