Abstract
This study investigated the influence of curing mode (dual- or self-cure) on the surface energy and sorption/solubility of four self-adhesive resin cements (SARCs) and one conventional resin cement. The degree of conversion (DC) and surface energy parameters including degree of hydrophilicity (DH) were determined using Fourier transform infrared spectroscopy and contact angle measurements, respectively (n = 5). Sorption and solubility were assessed by mass gain or loss after storage in distilled water or lactic acid for 60 days (n = 5). A linear regression model was used to correlate between the results (%DC vs. DH and %DC/DH vs. sorption/solubility). For all materials, the dual-curing consistently produced significantly higher %DC values than the self-curing (p < 0.05). Significant negative linear regressions were established between the %DC and DH in both curing modes (p < 0.05). Overall, the SARCs showed higher sorption/solubility values, in particular when immersed in lactic acid, than the conventional resin cement. Linear regression revealed that %DC and DH were negatively and positively correlated with the sorption/solubility values, respectively. Dual-curing of SARCs seems to lower the sorption and/or solubility in comparison with self-curing by increased %DC and occasionally decreased hydrophilicity.
Highlights
Self-adhesive resin cements (SARCs) have been developed to reduce the multiple clinical steps required for application of the luting agents
The self-adhesive resin cements (SARCs) are categorized as dual-cured resin cements, in which both chemical-activating and light-activating mechanisms are involved
The resin have polar hydrophilic sites, which can serve as water absorption sites oxide, and urethane groups, respectively), which can serve as water absorption sites [10,11], leading to
Summary
Self-adhesive resin cements (SARCs) have been developed to reduce the multiple clinical steps required for application of the luting agents. These materials include acidic, hydrophilic methacrylate monomers, which simultaneously demineralize and infiltrate the tooth substrate, resulting in micromechanical retention and potentially additional chemical bonding [1,2]. The SARCs are categorized as dual-cured resin cements, in which both chemical-activating and light-activating mechanisms are involved. The degree of conversion (DC) of dual-cured resin cements is generally lower when they are self-cured than when dual-cured, the extent is related to the initiation system in each material [3].
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