Determination of dental decay rates with optical coherence tomography

Autor(es)

Freitas, A. Z. ^[1] ; Zezell, D. M. ^[1] ; Mayer, M. P. A. ^[2] ; Ribeiro, A. C. ^[2] ; Gomes, A. S. L. ^[3] ; Vieira, Jr., N. D. ^[1]

Afiliação do(s) autor(es)

^[1] IPEN CNEN SP, Nucl & Energy Res Inst, BR-05508900 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Inst Biomed Sci, BR-05508900 Sao Paulo - Brazil

^[3] Univ Fed Pernambuco, Grad Program, Odontol & Phys Dept, BR-50670901 Recife, PE - Brazil

• Tipo de documento: Artigo Científico
• Fonte: LASER PHYSICS LETTERS; v. 6, n. 12, p. 896-900, DEC 2009.
• Citações Web of Science: 33

Resumo

We report the use of optical coherence tomography (OCT) to detect and quantify demineralization process induced by S. mutans biofilm in third molars human teeth. Artificial lesions were induced by a S. mutans microbiological culture and the samples (N = 50) were divided into groups according to the demineralization time: 3, 5, 7, 9, and 11days. The OCT system was implemented using a light source delivering an average power of 96 mu W in the sample arm, and spectral characteristics allowing 23 mu m of axial resolution. The images were produced with lateral scans step of 10 pan and analyzed individually. As a result of the evaluation of theses images, lesion depth was calculated as function of demineralization time. The depth of the lesion in the root dentine increased from 70 pm to 230,urn (corrected by the enamel refraction index, 1.62 @ 856 nm), depending of exposure time. The lesion depth in root dentine was correlated to demineralization time, showing that it follows a geometrical progression like a bacteria growth law. {[}GRAPHICS] Progression of lesion depth in root dentine as function of exposure time, showing that it follows a geometrical progression like a bacteria growth law(C) 2009 by Astro Ltd. Published exclusively by WILEY-VCH Verlag GmbH \& Co. KGaA (AU)

• Processo FAPESP: 00/15135-9 - Implementação de um sistema laser de terawatt e suas aplicações
• Beneficiário: Nilson Dias Vieira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático