The effect of curing mode of dual-cure resin cements on bonding performance of universal adhesives to enamel, dentin and various restorative materials

Abstract

The effect of curing mode of dual-cure resin cements on the tensile bond strength (TBS) of universal adhesives to enamel, dentin, zirconia, lithium disilicate ceramics (LDS), feldspathic porcelain (FP), and a Pd-Au alloy was evaluated. The substrates were bonded using Tokuyama Universal Bond (TUB) or Scotchbond Universal Adhesive (SBU), followed by luting with Estecem II (ECII) or Rely-X Ultimate (RXU), respectively, which were used either in light-curing or self-curing mode. The TBS test was performed after 24 h or 5,000 thermal cycles. Light-curing significantly improved the 24-h TBS of TUB/ECII to enamel, dentin and FP, as well as the TBS of SBU/RXU to all substrates except LDS. After thermal cycling, light-curing significantly increased the TBS of both adhesives/cements to dentin, but significant differences between curing modes were seldom observed for other substrates. This suggested that lightcuring is essential for the hydrophilic dentin, but self-curing might be sufficient for other substrates.

Immediate bond performance of resin composite luting systems to saliva‐contaminated enamel and dentin in different curing modes

“…The results for RXS in the 24-h groups, in which the groups in the self-curing mode showed significantly lower enamel and dentin SBSs than the groups in the dual-curing mode, were in line with the findings of a previous study [13]. One of the explanations for this behavior may be the lower degree of conversion of both the primer layer and resin composite luting agent in the self-cure groups.…”

“…In the previous generation of dual-curing resin composite luting agents, there was a problem with the discrepancy in the degree of conversion between self-curing and dual-curing modes [12,13]. Takubo et al [29] investigated the polymerization behavior of dual-cure resin composite luting agents in different light-irradiation conditions with or without the application of primer on the resin composite luting agent, based on ultrasonic speed measured through the materials during setting.…”

“…Although most resin composite luting systems use dual-polymerization systems, the degree of chemical reaction might not be equivalent among different curing modes [11]. Therefore, the bond performance and mechanical properties of a layer of resin composite luting agent may be different in different curing modes [12,13]. In clinical situations, the bond performance and mechanical properties of resin composite luting agents are reduced because of insufficient light delivery from the curing unit, due to obstruction by overlying indirect restorations or a large distance from the curing tip [14,15].…”

Influence of the activation mode on long-term bond strength and endogenous enzymatic activity of dual-cure resin cements

“…They can be classified according to the polymerization mode (self-cure, light-cure, or dual-cure) or based on the dental surface pre-treatment (multi-step or self-adhesive cements). Weakness in the adhesive and cementation procedures, such as incomplete polymerization of the resin cement or reduced adhesive quality, may result in higher water sorption and solubility, increased marginal leakage, and decreased bond strength with consequent clinical failure due to debonding, fractures, or secondary caries [1][2][3][4][5].…”

Influence of Novel Experimental Light-Cured Resin Cement on Microtensile Bond Strength

“…Resin cement can be categorized by bonding [ 6 , 7 ], including total-etch bonding, single-step etch bonding, self-cured resin cement, and dual-cured resin cement, and by polymerization, which includes self-cured, light-cured, and dual-cured polymerization [ 8 , 9 ]. Recently, dual-cured resin cement has become widespread for indirect restoration, providing the optimal combination of light-cured and chemical polymerization even amid inadequate irradiations [ 10 , 11 ].…”