Restoration Interface Microleakage Using One Total-etch and Three Self-etch Adhesives

Abstract

The common belief that simpler, speedier, more user-friendly adhesives always reduce technique sensitivity should be revaluated. Clinicians should resist the attraction of new, faster, easier-use materials and ask for laboratory and clinical studies before switching to a new material. SUMMARYThis study evaluated the efficacy of a total-etch and three self-etch adhesives in reducing microleakage after three months water storage and thermocycling.Thirty freshly extracted caries-free human premolars and molars were used. Class V standardized preparations were performed on the facial and lingual surfaces, with the gingival margin placed 1 mm below the CEJ. The teeth were randomly divided into four groups; Group I: Xeno III one-step self-etch adhesive (Dentsply/Caulk), Group II: Prime & Bond NT total-etch adhesive (Dentsply/Caulk), Group III: i-Bond one-step selfetch adhesive (Heraeus Kulzer) and Group IV: Clearfil SE Bond two-step self-etch adhesive (Kuraray Medical). The teeth were restored using 2 mm increments of shade A2 resin composite (Esthet-X, Dentsply/Caulk). Each layer was cured using the Spectrum 800 curing light (Dentsply/Caulk) for 20 seconds at 600mW/cm 2 . The teeth were stored in distilled water for 90 days. Samples were thermocycled 500x between 5°C and 55°C with a dwell time of 30 seconds, then placed in a 0.5% methylene blue dye solution for 24 hours at 37°C. Samples were sectioned longitudinally and evaluated for microleakage at the occlusal and gingival margins under a stereomicroscope at 20x magnification. Dye penetration was scored: 0=no penetration; 1=partial dye penetration along the occlusal or gingival wall; 2=dye penetration along the occlusal or gingival wall; 3=dye penetration to and along the axial wall.A Mann-Whitney test was used to demonstrate significantly more dye penetration in Group III than in the other groups at both the occlusal and gingival scores (p<0.0001). When comparing the

Effect of fiber-reinforced composite at the interface on bonding of resin core system to dentin

“…5). These findings were consistent with those of previous studies, which reported that resin tags made only a minor contribution to bond strength 7,31,32) . As a result, the shear bond strengths obtained with Clearfil SE Bond were statistically similar (p=0.076) to those obtained with Solobond Plus in this study.…”

“…Mild self-etch adhesives produce hybrid layers thinner than totaletch systems 7) . In this study, the SEM images of specimens prepared from the adhesive systems showed difference in surface texture between the two systems.…”

“…For two-step self-etch adhesives, they require separate application steps of a mild self-etch primer and a hydrophobic resin. These mild self-etch systems (pH<2) are able to partially remove the smear layer and penetrate the dentin surface, creating a less pronounced resin tag formation and hybrid layers that are thinner than those of totaletch systems 7) . Adhesion to dentin substrate provides retention for the core foundation resin as well as reinforcement characteristics that are beneficial in the treatment of compromised teeth 8) .…”

Analysis of micro-shear bond strength of self-etch adhesive systems with dentine: An in vitro study

“…13 Changing the gap dimensions between bonded interface also allows microleakage. 14,15 The self-etch systems do not require separate etching and priming steps unlike total etch systems 16 ; another concern with the self-etch systems is the presence of water or solvent and it also allows water diffusion, which affects the integrity of restorative interface. 17 Some self-etch adhesives have limited diffusion through smear layer due to their weak acidity.…”

Effect of lining with a flowable composite on internal adaptation of direct composite restorations using all-in-one adhesive systems

“…In addition, there have been some arguments on the efficacy of the all-in-one adhesive systems on sealing capability of the restorations 18,19) . However, little information is available on internal adaptation of a composite restoration using all-in-one adhesive systems with a flowable composite lining.…”