H. H. Zhua, Q. G. Chenb, B. Linc, d, and H. Chena, *
a Department of Conservative Dentistry and Periodontic, Affiliated Hospital of Stomatology, Medical College,
Zhejiang University, Hangzhou 310006, China
b College of Life Information Science & Instrument Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
c State Key Lab of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
d NERC for Optical Instrument, Zhejiang University, Hangzhou 310027, China
*e-mail: huic66@hotmail.com
Received September 18, 2011; in final form, October 2, 2011; published online February 6, 2012
Abstract—The validity of laser induced fluorescence spectroscopy for early diagnosis of occlusal caries irra-
diated by 403 nm diode laser compared to commercial device DIAGNOdent pen was investigated. The quanti-
tative evaluation parameter based on the fluorescence intensity area ratio of different bands F(440–
480nm)/F(540–700 nm) was built. And the linear correlation analysis between fluorescence result and corre-
sponding DIAGNOdent reading is performed to be r = –0.9085. Moreover, the factors of irradiation laser power
and excited site influencing the fluorescence distribution was experimentally investigated. The result shows that
the fluorescence spectra at different site of sound occlusal surface is different and the higher laser power will
lower the sensitivity of evaluation parameter based on the red fluorescence region increasing. The work is of
great significance for practical application of laser induced fluorescence at 403 nm.
DOI: 10.1134/S1054660X12030310
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