Bond Strength of Adhesive Systems to Er, Cr:YSGG Laser-Irradiated Dentin

Autor(es)

Carvalho, Adriana Oliveira ^[1] ; Reis, Andre Figueiredo ^[2] ; de Oliveira, Marcelo Tavares ^[3] ; de Freitas, Patricia Moreira ^[4] ; Correa Aranha, Ana Cecilia ^[4] ; Eduardo, Carlos de Paula ^[4] ; Giannini, Marcelo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba, SP - Brazil

^[2] Univ Guarulhos, Dept Operat Dent, Guarulhos, SP - Brazil

^[3] Nove de Julho Univ, Dept Dent, Sao Paulo - Brazil

^[4] Univ Sao Paulo, Sch Dent, Dept Restorat Dent, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Photomedicine and Laser Surgery; v. 29, n. 11, p. 747-752, NOV 2011.
• Citações Web of Science: 10

Resumo

Objective:The purpose of this study was to evaluate the effects of Er, Cr:YSGG laser irradiation and different adhesive procedures on bond strength of two bonding agents to dentin. Background data:Studies have shown that laser-irradiated dentinal tissue yields lower bond strengths than does nonirradiated dentin. In this study, different treatment methods of laser irradiating dentin were studied to enhance the bond strength of bonding agents to nonirradiated dentin. Methods:Third molars were wet ground with SiC until the occlusal flat dentin surface was exposed, and the teeth were randomly assigned to six groups (n = 5). A two-step self-etching primer (Clearfil SE Bond, G1) and a two-step etch-and-rinse adhesive (Single Bond Plus, G2) were applied to the nonirradiated dentin surface according to manufacturer's instructions, as control groups. In G3 and G4, the same adhesives were applied after Er, Cr:YSGG laser irradiation, whereas in G5 and G6 adhesives were applied after Er, Cr:YSGG laser irradiation, phosphoric acid etching, and NaOCl deproteinization of etched dentin. The Er,Cr: YSGG laser worked at 2.78 mu m and the repetition rate was fixed at 20 Hz. Composite blocks were built on bonded surfaces and the teeth were stored for 24 h at 37 degrees C. Restored teeth were vertically and serially sectioned to obtain bonded specimens for the bond strength test. Data were analyzed by two-way ANOVA and Tukey test (alpha = 5%). Results:Laser irradiation reduced bond strengths for the two adhesives, regardless of acid etching and deproteinization of dentin post-irradiation (p < 0.05). The self-etching primer system showed higher bond strengths to laser irradiated dentin than did Single Bond Plus (p < 0.05). The adhesive systems applied to normal dentin yielded higher bond strengths than when they were applied to laser irradiated dentin (p < 0.05). Conclusions:The self-etching primer seemed to be less affected by dentin irradiation with Er, Cr:YSGG laser. The additional etching and NaOCl solution did not overcome the effects of laser irradiation on dentin. (AU)

• Processo FAPESP: 05/60697-9 - Avaliacao dos efeitos da irradiacao do substrato dentinario com laser er:yag nos procedimentos restauradores adesivos: analise de permeabilidade, das propriedades fisicas e observacao microscopica.
• Beneficiário: Marcelo Giannini
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 05/56533-0 - Avaliacao dos efeitos da irradiacao do substrato dentinario com laser er:yag nos procedimentos restauradores adesivos: analise da permeabilidade, das propriedades fisicas e observacao microscopica.
• Beneficiário: Marcelo Tavares de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 98/14270-8 - Centro de Ciências Ópticas e Fotônica
• Beneficiário: Vanderlei Salvador Bagnato
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs