Influence of the Additional Er:YAG Laser Conditioning Step on the Microleakage of Class V Restorations

Autor(es)

Esteves-Oliveira, Marcella ^[1] ; Carvalho, Wendell L. ^[2] ; Eduardo, Carlos de P. ^[1] ; Zezell, Denise M. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Dent, Dept Restorat Dent, Sao Paulo - Brazil

^[2] Univ Fed Rio Grande do Norte, Ctr Hlth Sci, Dept Restorat Dent, BR-59072970 Natal, RN - Brazil

^[3] IPEN CNEN SP, Ctr Lasers & Aplicacoes, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS; v. 87B, n. 2, p. 538-543, NOV 2008.
• Citações Web of Science: 8

Resumo

The purpose of this study was to evaluate the influence of an additional Er:YAG laser conditioning step after laser cavity preparations, on the microleakage of class V composite restorations. Forty-eight bovine incisors were randomly divided into four groups: G1(control) cavities prepared with bur, G2- cavities prepared with laser (400 mJ/2 Hz), G3-cavities prepared and subsequently conditioned with Er:YAG laser (60 mJ/2 Hz); G4-idem for G3, but the laser conditioning was carried out without water-spray. All the cavities were restored using Clearfill SE Bond (R) and Z-250 (R) composite resin. The samples were thermal cycled for 700 cycles and then immersed in 50% silver nitrate solution. The sectioned restorations were exposed to a photoflood lamp to reveal silver nitrate penetration. The Kruskal-Walis one-way analyses of variance test and post hoc Wilcoxon pair-wise comparison were used to compare microleakage degrees. At the gingival margin G2 showed a lower microleakage mean than the control bur-prepared cavities (p = 0.0003). At occlusal margins there were no statistically significant differences between the groups (p = 0.28). It may be concluded that Er:YAG laser class V cavity preparations do not need to be followed by an additional laser conditioning step to result in levels of microleakage similar to or lower than those obtained after bur preparations. (C) 2008 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 87B: 538-543, 2008 (AU)

• Processo FAPESP: 05/51689-2 - Centro de Pesquisa em Óptica e Fotônica - UNICAMP (CEPOF-UNICAMP)
• Beneficiário: Hugo Luis Fragnito
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 97/10823-0 - Projeto Er: YAG laser em odontologia para pesquisas laboratoriais e clínicas
• Beneficiário: Carlos de Paula Eduardo
• Modalidade de apoio: Auxílio à Pesquisa - Programa Infraestrutura - Equipamentos