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  • Effect of polyacrylic acid on the interface and bond strength of self-adhesive resin cements to dentin.

Effect of polyacrylic acid on the interface and bond strength of self-adhesive resin cements to dentin.

The journal of adhesive dentistry (2013-04-06)
Priscila Stona, Gilberto Antonio Borges, Marcos Antônio Montes, Luiz Henrique Júnior, João Batista Weber, Ana Maria Spohr
ABSTRACT

To examine the influence of 11.5% polyacrylic acid pretreatment on the interface and bond strength of self-adhesive resin cements (Maxcem Elite, RelyX Unicem, SeT) to dentin. Fifty-six third molars were randomly divided into seven groups: RelyX ARC as control (ARC), RelyX Unicem (RLXU), Maxcem Elite (MCE), SeT (ST), polyacrylic acid+RelyX Unicem (RLXU-P), polyacrylic acid+Maxcem Elite (MCE-P), and polyacrylic acid+SeT (ST-P). Resin composite blocks were luted to flat dentin. After storage in distilled water for 24 h, sticks with a cross-sectional area of ca 0.80 mm2 were obtained (n = 24 per group) and submitted to a microtensile bond strength (µTBS) test in a universal testing machine at a crosshead speed of 0.5 mm/min. Two sets from each group were sectioned mesiodistally in the center of the crown and observed with a scanning electron microscope at 4000X magnification. The mean results of the µTBS test (MPa) followed by the same letter do not differ statistically significantly according to ANOVA and Tukey's post-hoc test (p < 0.05): ARC = 24.19 (± 6.90)a, RLXU-P = 23.12 (± 6.18)a, MCE-P = 13.09 (± 5.87)b, RLXU = 10.23 (± 2.88)b,c, and MCE = 8.14 (± 4.63)c. All SeT specimens failed during the cutting procedure. The hybrid layer was not observed for the self-adhesive resin cements, and resin tags were observed for RelyX Unicem and Maxem Elite when dentin was pretreated with polyacrylic acid. Pretreatment with 11.5% polyacrylic acid was effective for bonding RelyX Unicem and Maxcem Elite to dentin.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Poly(acrylic acid, sodium salt) solution, average Mw ~8,000, 45 wt. % in H2O
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Poly(acrylic acid, sodium salt) solution, average Mw ~1,200, 45 wt. % in H2O
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Poly(acrylic acid) solution, average Mw ~100,000, 35 wt. % in H2O
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Poly(acrylic acid) solution, average Mw ~250,000, 35 wt. % in H2O
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Poly(acrylic acid) solution, average Mw ~2,000, 50 wt. % in H2O, electronic grade
Supelco
Poly(acrylic acid sodium salt), analytical standard, for GPC, 16,000
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Poly(acrylic acid sodium salt), average Mw ~2,100
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Poly(acrylic acid), analytical standard, average Mn 130,000 (Typical)
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Poly(acrylic acid)
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Poly(acrylic acid), average Mv ~4,000,000
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Poly(acrylic acid), average Mv ~3,000,000
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Poly(acrylic acid sodium salt), average Mw ~5,100 by GPC, powder