Y. R. Nia, Z. Y. Guoa, *, S. Y. Shua, b, C. C. Zenga, H. Q. Zhonga,
B. L. Chena, Z. M. Liua, and Y. Baoc
a Key Laboratory of Laser Life Science of Ministry of Education of China, South China Normal University,
Guangzhou 510631, Guangdong, China
b Institute of Cognitive Neuroscience, South China Normal University,
Guangzhou 510631, Guangdong, China
c Department of Applied Mechanics and Engineering, Sun Yat-Sen University,
Guangzhou 510275, Guangdong, China
*e-mail: xncamellian@hotmail.com
Received May 30, 2011; in final form, June 20, 2011; published online October 24, 2011
Abstract—Oxidative bleaching changes of human teeth induced changes in the optical properties of dental tis-
sue. We introduced 1310 nm wavelengths of optical coherence tomography (OCT) attenuation coefficient
method which is a relatively novel and rarely reported methodology to measure the correlation coefficient dur-
ing the teeth oxidative bleaching procedure. And the quantitative parameters of enamel optical thickness and
disruption of the entrance signal (DES) were extracted from the OCT images. The attenuation coefficient of the
bleached tissue is 6.2 mm–1 which is significant (p < 0.001) higher than that unbleached sample is 1.4 mm–1.
But attenuation coefficient varied significantly (p < 0.001) between 5.9 and 1.5 mm–1 in dentine which is down-
trend. Furthermore, the persistence of bleaching oxidation in 35% hydrogen peroxide-induced optical thickness
of enamel is similar with unbleached tissue which may indicate the refractive index of enamel is unchanged.
Moreover, disruption of the entrance signal (DES) analysis showed that remarkable difference was appeared at
enamel surface. The results indicate that optical properties of oxidative bleaching human dental tissue can be
determined by attenuation coefficient using OCT system.
DOI: 10.1134/S1054660X11230149
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