Mechanically induced EPR signals in tooth enamel.
Sample preparation of tooth enamel for electron paramagnetic resonance (EPR) dosimetry usually involves mechanical operations. The present study shows that mechanical operations performed without water cooling generate a paramagnetic center inducing a stable isotropic EPR signal with g-value of 2.00320 and linewidth of about 0.1 mT. Using EPR spectrum simulation, the similarity between the mechanically induced signal and the signal generated when the enamel is heated in air at a temperature above 600 degrees C was investigated. Results indicate that the mechanically induced signal is related to sample temperature increase during mechanical friction.
Aragno
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Istituto Superiore di Sanità, Physics Laboratory, Rome, Italy.
Fattibene
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Onori
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D000328:Adult; D001696:Biomechanical Phenomena; D003743:Dental Enamel / Q000737:chemistry* / Q000528:radiation effects*; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals / Q000032:analysis; D006652:Histological Techniques; D006801:Humans; D066298:In Vitro Techniques; D013696:Temperature
D005609:Free Radicals