Impact of monomer functional groups of resin-based materials on the interaction with water

Abstract

<p><strong>Objective: </strong>The objective of this <em>in vitro</em> study was to compare dentin bonding systems and composite resins based on their functional groups in terms of water sorption (WS) and water solubility (WSB). <strong>Material and Methods: </strong>Three dentin bonding systems (Adper Single Bond 2 – 3M ESPE, Clearfil SE Bond – Kuraray, P90 Adhesive System – 3M ESPE) and three commercial composite resins (Filtek Z350 – 3M ESPE, Filtek Z250 – 3M ESPE, Filtek P90 – 3M ESPE) were tested. Eight specimens of each material were prepared to evaluate the WS and WSA. The discs were individually stored in a desiccator until constant mass was achieved. Specimens were then individually stored in distilled water until the mass was stabilized again. Finally, the specimens were dried again in the desiccator until constant mass was obtained. WS and WSA were calculated from these measurements. Data were analyzed by one-way ANOVA and Tukey post hoc test (p < 0.05). <strong>Results:</strong> Filtek Silorane-Bond presented the lowest values of WS, and Clearfil SE Bond presented the lowest WSB. Filtek Silorane resin showed the lowest WS and WSA results. <strong>Conclusion:</strong> Based on the results, it can be concluded that the WS and WSB were influenced by the composition of the materials. The main functional group of the materials determines their susceptibility to water and influences their performance. </p>

Impact of photoinitiator quality on chemical-mechanical properties of dental adhesives under different light intensities

“…The results obtained for water sorption showed the best behavior for G2, with lower mean values when compared with those of G3 and G4 (Table I). Studies have suggested that the water sorption of adhesive systems is influenced by the composition and hydrophilicity of the material [9,[25][26][27]. This fact was observed Silva TM et al…”

“…The evaluation of the physical properties of sorption and solubility is relevant to the profile of adhesive systems [9], as both can lead to extensive chemical and physical processes with deleterious effects on mechanical properties such as flexural strength, modulus of elasticity, and degree of conversion. These can affect the deformation mechanisms [29] and the structure and function of the polymers [27,28].…”

“…The aqueous phase is rich in HEMA, an aggregate monomer for increasing water compatibility and adhesive infiltration on the demineralized and wet dentin substrate. However, HEMA has a linear chain that does not have the same polymerization potential as Bis-GMA, which provides a poorly polymerized adhesive interface favoring longitudinal degradation [5][6][7][8][9]. Photoinitiators, of which camphorquinone is the most commonly used in current adhesive systems, are added to the adhesive formulations for polymerization reaction.…”