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EnglishPurpose: The aim of this study was to investigate the influence of aging on bond strength of a chitosan-containing experimental adhesive, assayed with microtensile bond strength test (μTBS) and nanoleakage analysis. Methods and materials: Sixteen extracted third human molars were selected and flat dentin surface was exposed and assigned to two groups (N = 8) after acid-etching: Group 1: a chitosan containing primer followed by an unsolvated bonding agent (R2: 70% BisGMA, 28.75% TEGDMA, 0.5% EDMAB, 0.5% TPO, 0.25% CQ); Group 2 (control): a primer without chitosan (30% HEMA, 20% ethanol, 50% MES) followed by R2. A layer of resin composite (Filtek Z250, 3 M ESPE) was placed over the bonded surface and polymerized. Specimens were processed for μTBS in accordance with the non-trimming technique and pulled to failure either after Chewing Simulation (TCS; 37 °C in 0.5 mL artificial saliva, submitted to 50 N occlusal load, 1 Hz, up to 1,200,000 cycles) or after storage in artificial saliva at 37 °C for the same time (approximately 3 weeks; T0). Additional specimens were similarly processed to investigate nanoleakage expression under light microscopy and SEM. Statistical analysis was performed with the Mann–Whitney U-test (p < 0.05).
| Titolo: | Bond stability of a chitosan-containing experimental adhesive |
| Autori: | |
| Data di pubblicazione: | 2013 |
| Rivista: | |
| Abstract: | Purpose: The aim of this study was to investigate the influence of aging on bond strength of a chitosan-containing experimental adhesive, assayed with microtensile bond strength test (μTBS) and nanoleakage analysis. Methods and materials: Sixteen extracted third human molars were selected and flat dentin surface was exposed and assigned to two groups (N = 8) after acid-etching: Group 1: a chitosan containing primer followed by an unsolvated bonding agent (R2: 70% BisGMA, 28.75% TEGDMA, 0.5% EDMAB, 0.5% TPO, 0.25% CQ); Group 2 (control): a primer without chitosan (30% HEMA, 20% ethanol, 50% MES) followed by R2. A layer of resin composite (Filtek Z250, 3 M ESPE) was placed over the bonded surface and polymerized. Specimens were processed for μTBS in accordance with the non-trimming technique and pulled to failure either after Chewing Simulation (TCS; 37 °C in 0.5 mL artificial saliva, submitted to 50 N occlusal load, 1 Hz, up to 1,200,000 cycles) or after storage in artificial saliva at 37 °C for the same time (approximately 3 weeks; T0). Additional specimens were similarly processed to investigate nanoleakage expression under light microscopy and SEM. Statistical analysis was performed with the Mann–Whitney U-test (p < 0.05). |
| Handle: | http://hdl.handle.net/11368/2754166 |
| URL: | http://www.sciencedirect.com/science/article/pii/S0109564113003849?np=y |
| Appare nelle tipologie: | 1.5 Abstract in Rivista |