Determination of dental decay rates with optical coherence tomography


Autoria(s): FREITAS, A. Z.; ZEZELL, D. M.; MAYER, M. P. A.; RIBEIRO, A. C.; GOMES, A. S. L.; VIEIRA JR., N. D.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2009

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

FAPESP[00/15135-9]

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

PROCAD

PROCAD[0/15135-9]

Institute of Millenium in Nonlinear Optics, Photonics, and Biophotonics

Institute of Millenium in Nonlinear Optics, Photonics, and Biophotonics

Identificador

LASER PHYSICS LETTERS, v.6, n.12, p.896-900, 2009

1612-2011

http://producao.usp.br/handle/BDPI/28434

10.1002/lapl.200910092

http://dx.doi.org/10.1002/lapl.200910092

Idioma(s)

eng

Publicador

WILEY-V C H VERLAG GMBH

Relação

Laser Physics Letters

Direitos

restrictedAccess

Copyright WILEY-V C H VERLAG GMBH

Palavras-Chave #optical coherence tomography #caries lesion #diagnostic imaging #backscattering #BIOLOGICAL TISSUES #ARTIFICIAL CARIES #IN-VIVO #REFLECTOMETRY #TRANSILLUMINATION #LESIONS #Instruments & Instrumentation
Tipo

article

original article

publishedVersion