Adhesion after erbium, chromium:yttrium-scandium-gallium-garnet laser application at three different irradiation conditions

Autor(es)

Botta, Sergio Brossi ^[1] ; da Ana, Patricia Aparecida ^[2] ; Zezell, Denise Maria ^[2] ; Powers, John M. ^[3] ; Matos, Adriana Bona ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Dent, Dept Operat Dent, BR-05508000 Sao Paulo - Brazil

^[2] IPEN CNEN SP, Ctr Lasers & Applicat, Sao Paulo - Brazil

^[3] Univ Texas Houston, Houston Biomat Res Ctr, Dent Branch, Houston, TX - USA

• Tipo de documento: Artigo Científico
• Fonte: Lasers in Medical Science; v. 24, n. 1, p. 67-73, JAN 2009.
• Citações Web of Science: 24

Resumo

The aim of this study was to investigate whether distinct cooling of low fluence erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser irradiation would influence adhesion. Main factors tested were: substrates (two), irradiation conditions (three), and adhesives (three). A 750 mu m diameter tip was used, for 50 s, 1 mm from the surface, with a 0.25 W power output, 20 Hz, energy density of 2.8 J/cm(2) with energy per pulse of 12.5 mJ. When applied, water delivery rate was 11 ml/min. The analysis of variance (ANOVA) showed that laser conditioning significantly decreased the bond strength of all adhesive systems applied on enamel. On dentin, laser conditioning significantly reduced bond strength of etch-and-rinse and one-step self-etch systems; however, laser irradiation under water cooling did not alter bonding of two-step self-etching. It may be concluded that the irradiation with Er,Cr:YSGG laser at 2.8 J/cm(2) with water coolant was responsible for a better adhesion to dentin, while enamel irradiation reduced bond strength, irrespective of cooling conditions. (AU)

• Processo FAPESP: 04/02229-6 - Estudo in vitro da resistência ácida e da incorporação de flúor em esmalte dental irradiado com laser de Er, Cr:YSGG
• Beneficiário: Patricia Aparecida da Ana
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 03/12182-4 - Influencia das tecnicas de preparo cavitario e aplicacao do "primer" na resistencia de uniao de um sistema adesivo auto-condicionante.
• Beneficiário: Adriana Bona Matos
• Modalidade de apoio: Auxílio à Pesquisa - Regular