The crystalline indexes obtained through infrared spectroscopy (CI) and X-ray diffraction (CI) were used to analyze the structural changes of dentin and enamel in human teeth when subjected to heat treatments between room temperature (25 °C) to 1200 °C in atmospheric air and argon. Thermogravimetric (TGA) and differential scanning calorimetry (DSC) analyses of sound powders were also used to support the analysis. As the temperature increased, the CI increased exhibiting a behavior like that of the crystal grain size, and the CI increased until the β-TCP phase appeared. These results indicated that the CI was more variable to structural changes than the CI.
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