RESUMO
Surface treatment of dentin before the bleaching procedure may affect its permeability and influence the bond strength of restorative materials. This study evaluated the influence of surface treatment before the bleaching on shear bond strength (SBT) of restorative materials to intracoronal dentin. Dentin slabs were subjected to surface treatment: no bleaching (control - CON), no surface treatment + bleaching (HP), 37% phosphoric acid + bleaching (PA) and Er:YAG laser + bleaching (L). After the bleaching procedure, specimens (n=10) were restored with: microhybrid composite resin (MH), flowable composite resin (F), and resin-modified glass-ionomer cement (RMGIC). The shear test was carried out. ANOVA and Tukey's test (α=0.05) showed significant difference for surface treatment and restorative materials (p<0.05). CON presented higher STB and was statistically different from HP (p<0.05). PA and L showed intermediate values and were statistically similar to CON and HP (p>0.05). STB for MH and F were higher than RMGIC (p<0.05), and did not differ from each other (p>0.05). The surface treatments with phosphoric acid and Er:YAG laser before the bleaching procedure provided shear bond strength at the same level of unbleached dentin and the composite resins presented superior bond strength to the intracoronal dentin.
O tratamento superficial da dentina previamente ao clareamento pode afetar a sua permeabilidade e influenciar a resistência de união de materiais restaurados. Este estudo avaliou a influência do tratamento superficial antes do clareamento na resistência ao cisalhamento (RC) de materiais restauradores à dentina intracoronária. Fragmentos de dentina foram submetidos ao tratamento de superfície: não clareadas (controle - CON), sem tratamento de superfície + clareamento (HP), ácido fosfórico 37% + clareamento (AF), e laser Er:YAG + clareamento (L). Após o procedimento clareador, os espécimes foram restaurados com (n=10): resina composta micro-híbrida (MH), resina composta fluida (F), e cimento de ionômero de vidro modificado por resina (CIVMR). O teste de cisalhamento foi realizado. ANOVA e teste de Tukey (α=0,05) mostraram diferença significante para tratamento superficial e material restaurador (p<0,05). O grupo controle apresentou maior resistência de união e foi estatisticamente diferente de HP (p<0,05). AF e L mostraram valores intermediários e foram similares ao CON e HP (p>0,05). A resistência de união para MH e F foi maior que CIVMR (p<0,05), e não diferiram entre si (p>0,05). O tratamento da superfície dentinária com ácido fosfórico e laser Er:YAG previamente ao clareamento promoveu resistência de união ao nível da dentina não clareada e a adesão à dentina intracoronária foi superior com as resinas compostas.
Assuntos
Feminino , Humanos , Masculino , Síndrome do Cromossomo X Frágil/diagnóstico , Aberrações dos Cromossomos Sexuais/diagnóstico , Aberrações Cromossômicas , Bandeamento Cromossômico , Deficiências do Desenvolvimento/etiologia , Deficiências do Desenvolvimento/genética , Síndrome do Cromossomo X Frágil/genéticaRESUMO
Surface treatment of dentin before the bleaching procedure may affect its permeability and influence the bond strength of restorative materials. This study evaluated the influence of surface treatment before the bleaching on shear bond strength (SBT) of restorative materials to intracoronal dentin. Dentin slabs were subjected to surface treatment: no bleaching (control - CON), no surface treatment + bleaching (HP), 37% phosphoric acid + bleaching (PA) and Er:YAG laser + bleaching (L). After the bleaching procedure, specimens (n=10) were restored with: microhybrid composite resin (MH), flowable composite resin (F), and resin-modified glass-ionomer cement (RMGIC). The shear test was carried out. ANOVA and Tukey's test (α=0.05) showed significant difference for surface treatment and restorative materials (p<0.05). CON presented higher STB and was statistically different from HP (p<0.05). PA and L showed intermediate values and were statistically similar to CON and HP (p>0.05). STB for MH and F were higher than RMGIC (p<0.05), and did not differ from each other (p>0.05). The surface treatments with phosphoric acid and Er:YAG laser before the bleaching procedure provided shear bond strength at the same level of unbleached dentin and the composite resins presented superior bond strength to the intracoronal dentin.
