An in vitro evaluation of effect of eugenol exposure time on the shear bond strength of two-step and one-step self-etching adhesives to dentin

Abstract

Objectives:To evaluate the effect of the eugenol exposure time of an eugenol-based provisional restorative material on the shear bond strength of two-step and one-step self-etching adhesives to dentin, at three different time intervals of 24 h, 7 days, and 14 days.Materials and Methods:Forty extracted human posterior teeth were sectioned mesiodistally to obtain two halves and the resulting 80 halves were randomly assigned into four groups of 20 specimens each (Group-I, -II, -III, and -IV). Cavities of specified dimensions were prepared to expose dentin surface. In Group-I, temporarization was carried out with noneugenol cement (Orafil-G) for 24 h (control group). In Group-II, -III, and -IV, temporarization was carried out with eugenol cement (intermediate restorative material (IRM)) for 24 h, 7 days, and 14 days, respectively. Each group was further divided into two subgroups of 10 teeth each for two-step (Adper SE Plus) and one-step (Adper Easy One) self-etch adhesive systems, respectively. A plastic tube loaded with microhybrid composite resin (Filtek Z-350, 3M) was placed over the dentin surface and light cured. The specimens were subjected to shear stress in universal testing machine.Results:Group-II yielded low shear bond strength values compared with Group-III, -IV, and Group-I, which was statistically significant.Conclusions:The prior use of eugenol containing temporary restorative material reduced the bond strength of self-etch adhesive systems at 24-h period. No reduction in bond strength at 7 or 14 days exposure was observed with either two-step or one-step self-etch adhesive.

An in vitro Study to evaluate the effect of eugenol-free and eugenol-containing temporary cements on the bond strength of resin cement and considering time as a factor

“…suggested that ZOE affects the adhesive properties of resins either by changing the wettability and reactivity of the dentin or by interaction of the remnants of the ZOE material with the setting mechanism of resin composites. [ 4 5 ]…”

“…also fabricated restorations in the form of discs with 2 mm diameter and 3 mm height. [ 4 ] Saraç et al . used 4 mm × 4 mm × 1 mm acrylic resin plates as temporary restoration.…”

“…According to them, the diffusion rate of eugenol present in ZOE cement increased to a peak up to 24 h and later declined slowly afterward. [ 4 ] The possible cause for the decreased bond strengths in this group of specimens might be due to the presence of temporary cement remnants [ Figure 5 ].…”

The shear bond strength of MTA with three different types of adhesive systems: An in vitro study

“…The intensity of the interaction of SE adhesive systems with dentin was mostly dependent on the acidity and aggressiveness of the primer used. [ 17 ] SE adhesives have been classified based on their ability to penetrate smear layers and depth of demineralization as ultra-mild (pH >2.5), mild (pH ~2), moderately strong (pH 1-2), and strong (pH ≤1). The manufacturer of dyad flow has declared that it has a pH of 1.9, and One Coat 7.0 (Coltene Whaledent, Switzerland), a mild SE adhesive, has a reported pH of 2.0.…”