Influence of light intensity on surface-free energy and dentin bond strength of single-step self-etch adhesives

et al. 2015

Self Cite

The influence of an oxygen-inhibited layer (OIL) on the shear bond strength (SBS) to enamel and surface free-energy (SFE) of adhesive systems was investigated. The adhesive systems tested were Scotchbond Multipurpose (SM), Clearfil SE Bond (CS), and Scotchbond Universal (SU). Resin composite was bonded to bovine enamel surfaces to determine the SBS, with and without an OIL, of adhesives. The SFE of cured adhesives with and without an OIL were determined by measuring the contact angles of three test liquids. There were no significant differences in the mean SBS of SM and CS specimens with or without an OIL; however, the mean SBS of SU specimens with an OIL was significantly higher than that of SU specimens without an OIL. For all three systems, the mean total SFE (γS), polarity force (γSp), and hydrogen bonding force (γSh) values of cured adhesives with an OIL were significantly higher than those of cured adhesives without an OIL. The results of this study indicate that the presence of an OIL promotes higher SBS of a single-step self-etch adhesive system, but not of a three-step or a two-step self-etch primer system. The SFE values of cured adhesives with an OIL were significantly higher than those without an OIL. The SFE characteristics of the OIL of adhesives differed depending on the type of adhesive.

“…This may be attributed to the adsorption of the so‐called atmospheric contamination layer. It has been reported that the

{γ_{S}}^{d}

{γ_{S}}^{p}

, and

{γ_{S}}^{h}

values of cured adhesive with an OIL were significantly higher than those of cured adhesives without an OIL.…”

Section: Discussionsupporting

confidence: 44%

Influence of an oxygen‐inhibited layer on enamel bonding of dental adhesive systems: surface free‐energy perspectives

Ueta

et al. 2015

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“…This may be attributed to the adsorption of the so-called atmospheric contamination layer, particularly if the surface was activated chemically and/or mechanically (19). In addition, it has been reported that the c d S values of oxidized surfaces measured using this method are, in general, approximately 40 mN m À1 (21,22). The c S , c p S , and c h S for uncured EP did not show any significant differences from those of CA and FS, so the SFE characteristics of the resin composite were not considered to be influenced by type of resin composite.…”

Section: Discussionmentioning

confidence: 96%

“…The SM and CS adhesives showed higher SFE and higher SBS with both resin composites than did the GB adhesive. Optimal wettability is important to enable the materials to spread across the entire surface and to establish adhesion (18)(19)(20)(21)(22)27). Therefore, the maximum bond strength is assumed to occur when the SFE of the adherend surface is maximized.…”

Section: Discussionmentioning

confidence: 99%

Bonding performance and interfacial characteristics of short fiber‐reinforced resin composite in comparison with other composite restoratives

Takamizawa

et al. 2016

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The purpose of this study was to investigate the shear bond strength (SBS) and surface free-energy (SFE) of short fiber-reinforced resin composite (SFRC), using different adhesive systems, in comparison with other composite restoratives. The resin composites used were everX Posterior (EP), Clearfil AP-X (CA), and Filtek Supreme Ultra Universal Restorative (FS). The adhesive systems used were Scotchbond Multi-Purpose (SM), Clearfil SE Bond (CS), and G-Premio Bond (GB). Resin composite was bonded to dentin, and SBS was determined after 24 h of storage in distilled water and after 10,000 thermal cycles (TCs). The SFEs of the resin composites and the adhesives were determined by measuring the contact angles of three test liquids. The SFE values and SFE characteristics were not influenced by the type of resin composite, but were influenced by the type of adhesive system. The results of this study suggest that the bonding performance and interfacial characteristics of SFRC are the same as for other composite restoratives, but that these parameters are affected by the type of adhesive system. The bonding performance of SFRC was enhanced by thermal cycling in a manner similar to that for other composite restoratives.

“…The

γ_{normalS}^{d}

of the enamel surface remained relatively constant under all of the conditions tested. It has been reported that many oxidized surfaces have

γ_{normalS}^{d}

values that are close to 40 mN m −1 . This has been attributed to the ‘atmospheric contamination layer’, particularly if the surface is activated chemically or mechanically .…”

Section: Discussionmentioning

confidence: 99%

Influence of duration of phosphoric acid pre‐etching on bond durability of universal adhesives and surface free‐energy characteristics of enamel

Takamizawa

et al. 2016

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The purpose of this study was to evaluate the influence of duration of phosphoric acid pre-etching on the bond durability of universal adhesives and the surface free-energy characteristics of enamel. Three universal adhesives and extracted human molars were used. Two no-pre-etching groups were prepared: ground enamel; and enamel after ultrasonic cleaning with distilled water for 30 s to remove the smear layer. Four pre-etching groups were prepared: enamel pre-etched with phosphoric acid for 3, 5, 10, and 15 s. Shear bond strength (SBS) values of universal adhesive after no thermal cycling and after 30,000 or 60,000 thermal cycles, and surface free-energy values of enamel surfaces, calculated from contact angle measurements, were determined. The specimens that had been pre-etched showed significantly higher SBS and surface free-energy values than the specimens that had not been pre-etched, regardless of the aging condition and adhesive type. The SBS and surface free-energy values did not increase for pre-etching times of longer than 3 s. There were no significant differences in SBS values and surface free-energy characteristics between the specimens with and without a smear layer. The results of this study suggest that phosphoric acid pre-etching of enamel improves the bond durability of universal adhesives and the surface free-energy characteristics of enamel, but these bonding properties do not increase for phosphoric acid pre-etching times of longer than 3 s.