The effects of UV-irradiation on the ESR-dosimetry of tooth enamel

Nilsson, J. O.; Lund, Eva; Lund, Anders

doi:10.1016/s0969-8043(99)00275-4

Cited by 19 publications

(18 citation statements)

References 14 publications

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“…These signals are stable in time, saturate with irradiation time and are perhaps the same signals as observed by Nilsson et al (2001).…”

supporting

confidence: 71%

“…That increase was unstable, and the signal recovered to its initial intensity within a few tens of hours. Nilsson et al (2001) found that UV A/B-irradiation generated both a stable and an unstable signal. The stable signal saturated with irradiation time.…”

Section: Effect Of Uv Treatment On the Native Signalmentioning

confidence: 99%

“…Several reports of the EPR response of enamel to radiation from artificial UV lamps (Ivannikov et al, 1997;Sholom et al, 1998b;Nilsson et al 2001;El Faramawy, 2005a;Jiao et al, 2007) followed these early papers. The newer papers reported the nominal energy of the UV radiation emitted by the lamps, but not the spectra.…”

Section: Epr Response Of Tooth Enamel To Ultraviolet Radiationmentioning

confidence: 99%

“…A comparison of the intensities of the "dosimetric-like" signal reported in these papers is not straightforward because of the differences in the powers of the UV sources and in source-sample distances. Moreover, most of these studies were carried out with a very limited number of samples (Sholom et al, 1998b;Nilsson et al 2001;El Faramawy, 2005a). …”

Section: Epr Response Of Tooth Enamel To Ultraviolet Radiationmentioning

confidence: 99%

“…A special study of the effect of such lamps on the EPR spectrum of tooth enamel has shown no detectable increase of the dosimetric-like signal (Nilsson et al, 2001). Since the U.S. Food and Drug Administration approval in 1997, it has also become common to use lasers instead of mechanical drills for treating tooth decay (Convissar and Goldstein, 2003).…”

mentioning

confidence: 99%

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EPR dosimetry with tooth enamel: A review

Fattibene

Callens

2010

Applied Radiation and Isotopes

212

160

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When tooth enamel is exposed to ionizing radiation, radicals are formed that can be detected using Electron Paramagnetic Resonance (EPR) techniques. EPR dosimetry using tooth enamel is based on the (presumed) correlation between the intensity or amplitude of some of the radiation-induced signals with the dose absorbed in the enamel. In the present paper a critical review is given of this widely applied dosimetric method.The first part of the paper is quite fundamental and deals with the main properties of tooth enamel and several of its model systems (e.g., synthetic apatites). Considerable attention is also devoted to the numerous radiation-induced and native EPR signals, and the radicals responsible for them. The relevant EPR detection, identification and spectrum analysing methods are reviewed from a general point of view. Finally, the need for solid state modelling and the linearity of the dose response are investigated.The second part is devoted to the practical implementation of EPR dosimetry using enamel. It concerns the preparation of samples, specific irradiation problems, spectrum acquisition and it is described how the dosimetric signal intensity and dose can be retrieved from the EPR spectra. Special attention is paid to the energy dependence of the EPR response and to sources of uncertainties. Results of and problems encountered in international intercomparisons and epidemiological studies are also dealt with.In the final chapter the future of EPR dosimetry with tooth enamel is analysed.

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“…These signals are stable in time, saturate with irradiation time and are perhaps the same signals as observed by Nilsson et al (2001).…”

supporting

confidence: 71%

Section: Effect Of Uv Treatment On the Native Signalmentioning

confidence: 99%

Section: Epr Response Of Tooth Enamel To Ultraviolet Radiationmentioning

confidence: 99%

Section: Epr Response Of Tooth Enamel To Ultraviolet Radiationmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

EPR dosimetry with tooth enamel: A review

Fattibene

Callens

2010

Applied Radiation and Isotopes

212

160

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Applications of automatic fittings to powder EPR spectra of free radicals,S>1/2, and coupled systems

Lund

2004

Appl. Magn. Reson.

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An automatic fitting procedure has been employed to analyze experimentally studied paramagnetic complexes in powder form by electron paramagnetic resonance (EPR). A least-squares fitting procedure utilizing analytical derivatives of the theoretically calculated spectrum with respect to the g-, zero-field, nuclear quadrupole, and hyperfine tensors was used to refine those parameters. An anisotropic line width could also be fitted. The theoretically calculated spectra were obtained by matrix diagonalization of a general spin Hamiltonian allowing also magnetical[y coupled systems to be analyzed. A VO 2~ S = 1/2 complex showing g and hyperfine anisotropic interactions and free radical systems featuring Aro I =~ 0 transitions due to the direct field effect or the presence of quadrupolar nuclei have been analyzed as well as NO s species on surfaces and radiation defects employed for EPR dosimetry. Analysis of systems with S > 1/2 and magnetically coupled species has also been attempted.

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