Optical coherence tomography provides the optical attenuation coefficient of bovine dentin irradiated by Nd:YAG
Carregando...
Data
Data de publicação
2018
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
É parte de
ENCONTRO DE OUTONO, 41.
Exportar
Resumo
Optical Coherence Tomography (OCT) is a non-destructive and non-invasive technique which provides transverse
images of biological structures contactless with the sample, with no use of ionizing radiation to penetrate
in the sample under analysis. These characteristics allow its clinical use without any side eÆects to the patient.
The optical attenuation coe±cient (OAC) is obtained by OCT and is related to the characteristics of the tissues.
This study aims to analyze the OAC from the OCT signal in bovine dentin to distinguish sound from demineralized
dentin. For this, sixty 8mm2 blocks of bovine root dentin, were randomized into 4 groups: G1- untreated;
G2- treated with acidulated phosphate fluoride (APF, [F]=1.23%, pH=3.3 to 3.9); G3- irradiated with Nd:YAG
laser (1064nm, 0.6W, 10Hz- Lares Research R∞) without photoabsorber; G4- irradiated with Nd:YAG laser (1064
nm, 0.6W, 10 Hz- Lares Research R∞) using a coal paste as photoabsorber. All samples were submitted to a 3-day
erosive demineralization protocol (Citric acid 1%, pH=3.6, 5 min, 2x/day) under agitation, and remineralization
(artificial saliva, pH=7, 120 min) cycling. In this study, it was noticed that the values of optical attenuation
coe±cient of all samples decreased after the erosive cycling. This finding indicates that the demineralization
promoted by acids, such as the citric acid creates empty spaces in the structure of dentin that increases the
number of interfaces and, as a consequence, increases the scattering of light and decreases the values of optical
attenuation coe±cients. It is possible to conclude that the optical attenuation coe±cient, calculated from the
OCT signal, is able to distinguish sound from demineralized bovine dentin. This quantitative parameter can
be used for diagnosis and to monitor the evolution of mineral loss in patients in near future.
Como referenciar
PEREIRA, DAISA L.; GOMES, GABRIELA V.; ZEZELL, DENISE M.; DEL VALLE, MATHEUS; ANA, PATRICIA A. Optical coherence tomography provides the optical attenuation coefficient of bovine dentin irradiated by Nd:YAG. In: ENCONTRO DE OUTONO, 41., 06-11 de maio, 2018, Foz do Iguaçu, PR. Resumo... São Paulo: Sociedade Brasileira de Física, 2018. p. 1-1. Disponível em: http://repositorio.ipen.br/handle/123456789/29825. Acesso em: 29 Apr 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.