Characterization of sound enamel and natural white spot lesions
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Brazilian Dental Science
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Objective: To compare optical, morphological, chemical, and physical aspects of the sound enamel and white
spot lesions (WSL) classified as ICDAS 2. Material and Methods: Seventeen human molars with one surface
presenting WSL and a sound surface (2 x 2 mm window) were characterized by Quantitative light-induced
fluorescence (QLF®), Optical coherence tomography (OCT), microhardness, and Raman spectroscopy. The ANOVA
and Tukey’s test were used at 5% significance level. Results: The QLF comparison between distinct substrates
yielded decreased ΔQ (integrated fluorescence loss) of -15,37%mm2 and -11,68% ΔF (fluorescence loss) for
WSL. The OCT detected mean lesion depth of 174,43 μm. ANOVA could not detect differences in the optical
attenuation coefficient between the substrates (p>0.05). Lower microhardness measures were observed in WSL
than on sound enamel (p<0.05). The Raman spectra showed four vibrational phosphate bands (v1, v2, v3, v4),
where the highest peak was at 960.3 cm-1 (v1) for both substrates. However, a 40% decrease in phosphate (v1)
was detected in WSL. The peak at 1071 cm-1 was higher for sound enamel, indicating the presence of a phosphate
band instead of the B-type carbonate. The spectra showed higher intensity of the organic composition at 1295 cm-1
and 1450 cm-1 for WSL. Conclusion: Non-invasive QLF, OCT and Raman spectroscopy were able to distinguish
differences in fluorescence, optical properties, and organic/inorganic components, respectively, between sound
enamel and WSL, validated by the destructive microhardness analysis.
Como referenciar
ARAUJO, ERIKA M. dos S.; VIDAL, CRISTINA de M.P.; FREITAS, ANDERSON Z. de; WETTER, NIKLAUS U.; MATOS, ADRIANA B. Characterization of sound enamel and natural white spot lesions. Brazilian Dental Science, v. 25, n. 4, p. 1-10, 2022. DOI: 10.4322/bds.2022.e3488. Disponível em: http://repositorio.ipen.br/handle/123456789/33577. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.