MICROTENSILE BOND STRENGTH AND NANOLEAKAGE OF A RESIN COMPOSITE BONDED TO DENTIN TREATED WITH GALLA CHINENSIS EXTRACT | ||||
| Egyptian Dental Journal | ||||
| Article 6, Volume 63, Issue 2 - April (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics), April 2017, Page 1649-1658 PDF (1.7 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2017.74561 | ||||
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| Authors | ||||
| Emad Aboalazm1; Rania Badawy2 | ||||
| 1Lecturer, Operative Dentistry, Suez-Canal University, Ismailia, Egypt | ||||
| 2Lecturer, Dental Materials, Suez-Canal University, Ismailia, Egypt | ||||
| Abstract | ||||
| Aim: This in vitro study aimed to evaluate the effect of dentin surface-treatment with 4mg/ml Galla Chinensis Extract (GCE) on microtensile bond strength and nanoleakage of a resin composite restoration, subjected to two different water storage periods. Materials and Methods: A total of thirty freshly extracted sound human molars were prepared and sliced coronally for application of a nanohybrid resin composite restorative material (Filtek Z350 XT). Exposed dentin surfaces, were acid-etched, to be either routinely covered by adhesive and resin composite, or treated with 4mg/ml Galla Chinensis Extract, followed by application of an adhesive and a resin composite. Treated teeth were divided into 3 subgroups according to time of assessment of their microtensile bond strength and nanoleakage after 24 hours, 3 months and 6 months of water storage. Data were statistically analyzed with One-way ANOVA at 95% confidence interval. Kolmogorov Smirnov and Shapiro-Wilk tests were applied for normality testing. Independent t-test was used to compare between different groups for different water storage periods. Results: Insignificantly different microtensile bond strength values between control and surface-treated teeth were recorded for the resin composite material immediately and after 3 months water storage periods. Lowest values were recorded after 6 months storage period, differing significantly (p ≤0.001) between control and surface-treated dentin group. The immediately tested control group revealed significantly the highest mean microtensile bond strength values (32.1±7.84 MPa) compared to both other control groups at different storage periods. SEM micrographs showed extensive silver deposition throughout the entire hybrid layer thickness of silver-impregnated sections at resin/dentin interfaces after 6 months aging period. These depositions penetrated into dentinal tubules and around the resin tags in the control group. Conclusions: Surface treatment of etched dentin with 4mg/ml Galla Chinensis Extract improved resistance of bonded resin composite restorations to hydrolysis in terms of improved microtensile bond strength and nanoleakage after 3and 6 months of water storage. | ||||
| Keywords | ||||
| Galla chinensis; microtensile bond strength; Nanoleakage; water storage; resin composite | ||||
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