Adhesives bonded to erbium:yttrium-aluminum-garnet laser-irradiated dentin: transmission electron microscopy, scanning electron microscopy and tensile bond strength analyses

Autor(es)

Bastos Ramos, Andreia Cristina ^{[1, 2]} ; Esteves-Oliveira, Marcella ; Arana-Chavez, Victor E. ^[3] ; Eduardo, Carlos de Paula ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Restorat Dent, Sch Dent, Special Lab Lasers Dent, BR-05508900 Sao Paulo - Brazil

^[2] Univ Fortaleza, Sch Dent, Fortaleza, CE - Brazil

^[3] Univ Sao Paulo, Lab Mineralized Tissue Biol, Dept Cell & Dev Biol, Inst Biomed Sci, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Lasers in Medical Science; v. 25, n. 2, p. 181-189, MAR 2010.
• Citações Web of Science: 23

Resumo

The aim of this in vitro study was to investigate the effect of erbium:yttrium-aluminum-garnet (Er:YAG) laser irradiation on dentinal collagen by transmission electron microscopy and to analyze the resin-dentin interface by scanning electron microscopy. A tensile bond strength test was also applied. Specimens from 69 sound human third molars were randomly divided into three groups: control (no laser), and two irradiated groups, laser 250 (250 mJ/2 Hz) and laser 400 (400 mJ/4 Hz). Then, specimens were restored with two adhesive systems, an etch-and-rinse or a self-etch system. Although ultrastructural examination showed a modified surface in the irradiated dentin, there was no statistical difference in bond strength values between the laser groups and controls (P < 0.05). In conclusion, the use of Er:YAG laser for ablating human dentin did not alter the main adhesion parameters when compared with those obtained by conventional methods, thus reinforcing its use in restorative dentistry. (AU)

• 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