Carious growth monitoring with optical coherence tomography
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2006
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LASERS IN DENTISTRY, 12th
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Optical Coherence Tomography was used to monitor subsurface caries evolution process in vitro. Human
tooth was used and bacteria were employed to induce caries lesions. Twenty-five human third molars, were
used in this study. The teeth were cut longitudinally at mesio-distal direction; the surfaces were coated with
nail varnish except for two squared windows (2x4 mm); at the cement-enamel junction. Artificial lesions were
induced by a S. Mutans microbiological culture. The samples (N = 50) were divided into groups according to
the demineralization time: 3, 5, 7, 9 and 11 days. The culture medium, was changed each 48 hours. After the
demineralization process the samples were rinsed with double-deionized water and stored in a humid
environment. The OCT system1
was implemented with average power of 96 µW in the sample arm, providing
a 23 µm of axial resolution. The images were produced with lateral scans step of 10 µm. The detection system
was composed by a detector, a demodulator and a computer. With the images generated by OCT it was
possible to determine the lesion depth as function of sample exposition time to microbiological culture. We
observed that the depth of the lesion in the root dentine increased from 70 µm to 230 µm, depending of
exposure time, and follows the bacterial population growth law. This OCT system accurately depicts hard
dental tissue and it was able to detect early caries in its structure, providing a powerful contactless high
resolution image of lesions.
Como referenciar
FREITAS, A.Z.; ZEZELL, D.M.; MAYER, M.P.A.; RIBEIRO, A.C.; GOMES, A.S.L.; VIEIRA JUNIOR, N.D. Carious growth monitoring with optical coherence tomography. In: RECHMANN, PETER (ed.); FRIED, DANIEL (ed.). In: LASERS IN DENTISTRY, 12th, January 21, 2006, San Jose, California, USA. Proceedings... p. 613704-1 - 613704-9. (SPIE Proceedings Series, 6137). Disponível em: http://repositorio.ipen.br/handle/123456789/25277. Acesso em: 24 Mar 2026.
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