Optical properties of bovine dentin when irradiated by Nd:YAG and a black dentifrice aimed at treating dentin erosion
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2019
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BRAZILIAN CONGRESS ON BIOMEDICAL ENGINEERING, 26th
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Resumo
Dental erosion has been extensively studied as a risk
factor for tooth loss or injure, and the early diagnosis of
lesions is essential for avoiding greater damages. Optical
Coherence Tomography (OCT) is a potential tool for
early diagnosis of demineralization. In this study, this
technique was used to analyze the optical changes of
dentin samples irradiated with Nd:YAG laser using a
black dentifrice as photoabsorber, then submitted to an
erosive cycling. 75 slabs of bovine root dentin were
randomized into 5 groups: G1—untreated; G2—treated
with acidulated phosphate fluoride gel (APF-gel,
[F-] = 1.23%, pH = 3.3–3.9); G3—irradiated with Nd:
YAG laser (100 μs, 1064 nm, 0.6 W, 10 Hz) without
photoabsorber; G4—irradiated with Nd:YAG laser using
a coal paste as photoabsorber; G5—irradiated with Nd:
YAG laser using a black dentifrice as photoabsorber. All
samples were submitted to a 3-day erosive demineralization
(Citric acid 1%, pH = 3.6, 5 min, 2 /day) under
agitation, and remineralization (artificial saliva, pH = 7,
120 min) cycling. The samples were evaluated by OCT
before treatments (baseline), after treatments and after
erosive cycling. Optical attenuation coefficient (μ) was
calculated using a Matlab routine, and the statistical
analysis was performed (a = 0.05). It was observed a
significant decrease on μ values after all treatments. Also,
the μ values decreased after erosive cycling, except for
the groups G3 and G5. It was concluded that OCT
technique is capable to distinguish among sound, treated
and demineralized dentin. As well, the black paste was efficient to act as a photoabsorber, helping the Nd:YAG
laser to decrease dentin erosion.
Como referenciar
PEREIRA, DAISA L.; DEL VALLE, MATHEUS; GOMES, GABRIELA V.; ZEZELL, DENISE M.; ANA, PATRICIA A. Optical properties of bovine dentin when irradiated by Nd:YAG and a black dentifrice aimed at treating dentin erosion. In: COSTA-FELIX, RODRIGO (ed.); MACHADO, JOÃO C. (ed.); ALVARENGA, ANDRÉ V. (ed.). In: BRAZILIAN CONGRESS ON BIOMEDICAL ENGINEERING, 26th, October 21-25, 2018, Armação de Buzios, RJ. Proceedings... Singapore: Springer Nature Singapore, 2019. p. 847-850. (IFMBE Proceedings 70/2). DOI: 10.1007/978-981-13-2517-5_131. Disponível em: http://repositorio.ipen.br/handle/123456789/30955. Acesso em: 20 Mar 2026.
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.