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CO 2 laser‐induced zonation in dental enamel: A Raman and IR microspectroscopic study
Author(s) -
Klocke Arndt,
Mihailova Boriana,
Zhang Shengqiang,
Gasharova Biliana,
Stosch Rainer,
Güttler Bernd,
KahlNieke Bärbel,
Henriot Peter,
Ritschel Bodo,
Bismayer Ulrich
Publication year - 2007
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.30690
Subject(s) - enamel paint , impact crater , laser , irradiation , apatite , raman spectroscopy , materials science , continuous wave , recrystallization (geology) , tooth enamel , remineralisation , mineralogy , optics , chemistry , composite material , geology , petrology , astrobiology , physics , nuclear physics
The gradient of structural alteration and molecular exchange across CO 2 laser‐irradiated areas in dental enamel was analyzed by Raman and attenuated total reflectance infrared microspectroscopy. The type and the degree of structural changes in morphologically distinguishable zones within the laser spot vary depending on the laser‐irradiation parameters—power (1 and 3 W), treatment time (5 and 10 s), and operational mode (super pulse and continuous wave). Using higher power, irrespective of the operation mode, the enamel tissue ablates and a crater is formed. The prevalent phase at the bottom of the crater is dehydrated O 2 2− ‐bearing apatite, that is, the fundamental framework topology is preserved. Additional nonapatite calcium phosphate phases are located mainly at the slope of the laser crater. No structural transformation of mineral component was detected aside the crater rim, only a CO 3 –CO 2 exchange, which decays with the radial distance. A lower‐power laser irradiation slightly roughens the enamel surface and the structural modification of enamel apatite is considerably weaker for continuous wave than for super pulse mode. Prolonged low‐power laser treatment results in recrystallization, and thus structural recovering of apatite might be of clinical relevance for enamel surface treatments. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2006