Marginal microleakage of composite resin restorations bonded by desensitizing one step self etch adhesive

Abstract

AimThe aim of this study was to investigate the effect of desensitizing agents on microleakage of composite resin restorations bonded by one step desensitized self etch adhesive. Materials and methodsClass V cavities (3 × 4 × 2 mm) were prepared on the buccal surfaces of 30 human molars, Teeth were classified into three groups according to the type of adhesive used (n = 10). Group 1: Adper Single Bond2. Group 2: l-bond. Group 3: is a control group of composite resin restoration without bonding agent. All cavities were restored with Filtek Z250 composite resin, stored in distilled water at 37 °C for 24 h and thermal cycled for 500 cycles. The root apices were sealed with utility wax, and all the surfaces, except for the restorations and 1 mm from the margins, were coated with two layers of nail varnish. The teeth were immersed in a 3% methylene blue dye solution for 24 h, and then rinsed in running water, blot-dried and sectioned longitudinally through the center of restorations from the facial to lingual surface. The sections were blindly assessed for microleakage of dye penetration by two independent evaluators using a stereomicroscope at 30× magnification for both the occlusal and gingival margins. Data were collected and statistically analyzed. ResultsA Mann–Whitney test demonstrated the highest significantly dye penetration rate for group 3 versus tested groups comparing the occlusal and gingival scores for each group, Wilcoxon Rank test showed significant difference for all groups. Etch and rinse adper single bond2 adhesive record a lower significant scores of dye penetration than self etch adhesive I-bond at both enamel and dentin margins. ConclusionAll adhesive systems exhibited dye penetration at both occlusal and gingival margins. Etch and rinse system is still considered a gold standard adhesive. Adper single bond2 revealed significantly less leakage compared to I-Bond.