Influence of photo-activation source on enamel demineralization around restorative materials

Autor(es)

Juliana de Oliveira Ferla ^[1] ; José Augusto Rodrigues ^[2] ; César Augusto Galvão Arrais ^[3] ; Ana Cecília Correa Aranha ^[4] ; Alessandra Cassoni ^[5]

Afiliação do(s) autor(es)

^[1] Univ Guarulhos - UnG. Graduate Division. Department of Restorative Dentistry - Brasil

^[2] Univ Guarulhos - UnG. Dental Research Division. Department of Restorative Dentistry - Brasil

^[3] Univ Estadual de Ponta Grossa - UEPG. Graduate Division. Department of Restorative Dentistry - Brasil

^[4] Univ de São Paulo - USP. School of Dentistry. Department of Restorative Dentistry - Brasil

^[5] Univ Guarulhos - UnG. Dental Research Division. Department of Restorative Dentistry - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Oral Research; v. 27, n. 3, p. 286-292, 2013-03-01.

Resumo

This study evaluated the effects of the photoactivation source and restorative material on the development of caries-like lesions on human enamel after an in vitro pH challenge. Enamel cavities were prepared in 36 blocks, which were assigned to two groups according to the restorative material: resin-modified glass ionomer (RMGI) and composite resin (CR). Samples were exposed to quartz-tungsten-halogen lamp, argon-ion laser, or light-emitting diode (n = 6). The Knoop microhardness (KHN) values of the top surface of all materials were evaluated. Restored enamel blocks were thermocycled and subjected to 10 demineralization-remineralization cycles at 37°C. KHN analysis of the superficial enamel was performed by four indentations located 100 mm from the restoration margin. The material KHN was not affected by the photoactivation source. No significant difference in KHN was noted between CR and RMGI. The enamel surface around RMGI exhibited a higher KHN (272.8 KHN) than the enamel around CR (93.3 KHN), regardless of the photoactivation source. Enamel demineralization around the dental restoration was not influenced by the photoactivation source. Less enamel demineralization was observed around the RMGI than around the CR restoration. (AU)

• Processo FAPESP: 09/02240-3 - Análise visual e quantitativa do potencial cariostático e microdureza de restaurações de resina composta e cimento de ionômero de vidro resino-modificado fotoativados com laser de íon argônio comparadas com luz halógena e LED
• Beneficiário: Alessandra Cassoni Ferreira
• Modalidade de apoio: Auxílio à Pesquisa - Regular