TY - JOUR
T1 - Microtensile bond strength of adhesive systems to dentin with or without application of an intermediate flowable resin layer
AU - de Goes, Mario Fernando
AU - Giannini, Marcelo
AU - di Hipólito, Vinícius
AU - Carrilho, Marcela Rocha de Oliveira
AU - Daronch, Márcia
AU - Rueggeberg, Frederick
PY - 2008
Y1 - 2008
N2 - This study evaluated the effect of flowable composite resin application on the microtensile bond strength μ TBS) of adhesive systems to dentin. Occlusal surfaces of human third molars were ground to obtain flat dentin surfaces. The crown of each tooth was sectioned occluso-gingivally into four quarters with a water-cooled diamond saw. One of the following adhesive systems was applied to dentin surface in each quarter of the same tooth, following manufacturers' instructions: Scotchbond Multipurpose, Single Bond Adper Prompt and Clearfil SE Bond. Experimental and control groups received the same treatment, except for the fact that a layer of flowable composite (Filtek Flow) was placed and light-cured on top of the adhesive layer in the specimens of the experimental groups. Resin composite (Filtek Z250) crown buildups were then made on the bonded surfaces and incrementally light-cured for 20 s. The restored teeth were stored in water at 37oC for 24 h. Each tooth quarter was serially cut in a longitudinal direction in order to obtain several bonded sticks (0.9-mm2 in cross-section). Maximal microtensile stress (in MPa) at failure was recorded using a universal testing machine. Data were analyzed by two-way ANOVA and Tukey's test at 5% significance level. Placement of a low-viscosity resin to the hybridized dentin increased the μTBS for all tested adhesive systems. However, such increase was significant only for Clearfil SE Bond (p<0.05). When the restorations were placed without low-viscosity resin, Clearfil SE Bond presented higher μTBS than Adper Prompt (p<0.05). For the groups treated with flowable composite, Clearfil SE Bond produced the highest μ TBS means to dentin. In conclusion, the effect of the addition of an intermediate flowable composite layer on μ TBS to dentin was material-dependent and resulted in an increased adhesion for all tested materials, though with significance only for Clearfil SE Bond.
AB - This study evaluated the effect of flowable composite resin application on the microtensile bond strength μ TBS) of adhesive systems to dentin. Occlusal surfaces of human third molars were ground to obtain flat dentin surfaces. The crown of each tooth was sectioned occluso-gingivally into four quarters with a water-cooled diamond saw. One of the following adhesive systems was applied to dentin surface in each quarter of the same tooth, following manufacturers' instructions: Scotchbond Multipurpose, Single Bond Adper Prompt and Clearfil SE Bond. Experimental and control groups received the same treatment, except for the fact that a layer of flowable composite (Filtek Flow) was placed and light-cured on top of the adhesive layer in the specimens of the experimental groups. Resin composite (Filtek Z250) crown buildups were then made on the bonded surfaces and incrementally light-cured for 20 s. The restored teeth were stored in water at 37oC for 24 h. Each tooth quarter was serially cut in a longitudinal direction in order to obtain several bonded sticks (0.9-mm2 in cross-section). Maximal microtensile stress (in MPa) at failure was recorded using a universal testing machine. Data were analyzed by two-way ANOVA and Tukey's test at 5% significance level. Placement of a low-viscosity resin to the hybridized dentin increased the μTBS for all tested adhesive systems. However, such increase was significant only for Clearfil SE Bond (p<0.05). When the restorations were placed without low-viscosity resin, Clearfil SE Bond presented higher μTBS than Adper Prompt (p<0.05). For the groups treated with flowable composite, Clearfil SE Bond produced the highest μ TBS means to dentin. In conclusion, the effect of the addition of an intermediate flowable composite layer on μ TBS to dentin was material-dependent and resulted in an increased adhesion for all tested materials, though with significance only for Clearfil SE Bond.
KW - Adhesive system
KW - Bond strength
KW - Composite resin
KW - Dentin
UR - http://www.scopus.com/inward/record.url?scp=61449522624&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=61449522624&partnerID=8YFLogxK
U2 - 10.1590/s0103-64402008000100009
DO - 10.1590/s0103-64402008000100009
M3 - Article
C2 - 18438560
AN - SCOPUS:61449522624
SN - 0103-6440
VL - 19
SP - 51
EP - 56
JO - Brazilian dental journal
JF - Brazilian dental journal
IS - 1
ER -