Effect of Storage Time on Microtensile Bond Strength of Self-Adhesive and Multi-Step Resin Cements to Dentin

Abstract

The purpose of this study was to evaluate the effects of long-term storage on the microtensile bond strength (µTBS) to dentin of two self-adhesive and three multi-step resin cements. Two self-adhesive cements RelyX U100 (U100) and seT PP (SET), and 3 multi-step resin cements, one using 2-step etch-and-rinse adhesive AllCem (ALC), and two conventional resin cements with self-etching primer Panavia F (PAN) and Multilink (MULT) were used. Human molars were restored (n=5), sectioned and subjected to the μTBS test after 24 h and 6 months. Fractured specimens were examined by stereomicroscope and SEM. The µTBS were analyzed by one-way ANOVA and Tukey test (α=0.05). ANOVA revealed a difference between groups (p<0.0001). All multi-step resin cements ALC, MULT and PAN showed statistically similar bond strength values that were higher than those of the U100 and SET groups. The bond strength value of ALC, MULT and PAN decreases significantly after 6 months. The majority of the failures were adhesive for all the groups. The µTBS produced by the self-adhesive cements were significantly lower than those observed for multi-step luting agents. Regardless of the numbers of steps of resin cements, the storage time reduces µTBS values to dentin only to multi-step luting agents.

Effect of Sonic Application of Self-Adhesive Resin Cements on Push-Out Bond Strength of Glass Fiber Posts to Root Dentin

“…However, poor signs of demineralization on dentin could be observed when self-adhesive resin cement was used. Some studies have demonstrated the limited capacity of self-adhesive cements to demineralize and dissolve the smear layer in order to interact with the adjacent dentin [19,20]. This limitation is attributed to the high viscosity of the cement, which makes it difficult for it to penetrate into the dentin tubules [2,4,21].…”

“…The low penetration potential of acidic monomers in self-adhesive cements affects their ability to penetrate in the smear layer. This may interfere in hybrid layer formation, thereby compromising the bond of self-adhesive cements [20,22].…”

“…However, the pH of seT PP remains very low after the reaction begins, which leads to the hydrophilicity of the cement and compromises its mechanical stability and its bond with the dentin substrate, thus reflecting negatively on its bond strength [34]. A recent study reported comparable microtensile bond strength values for seT PP and found this material demonstrated the lowest bond strength with multiple premature failures [20]. Some previous studies have reported that all specimens of seT PP cements failed before the test [34,35].…”

Effects of calcium hydroxide reagent on the bond strength of resin cements to root dentin and the retention force of FRC posts

“…Evaluation methods for bond strength of dental materials in dentistry usually include the micro-tensile and shear bond strength test 8,[21][22][23][24][25][26] . Root dentin has lower potential for bonding with less exposure of dentinal tubules compared to coronal dentin 27) ; reagents used during root canal treatment can affect bond strength even more 13,22) .…”

“…A number of studies have been undertaken to compare the bond strength of various resin cements to dentin 8,21,[23][24][25][26]28) . Most of these studies reported that adhesive resin cements, that require pretreatment, have higher bond strength compared to self-adhesive resin cements 23,24,26) . These results are consistent with our study where adhesive resin cements, ULR and PAF, which require pretreatment demonstrated greater bond strength.…”