Longitudinal analyses of composite resin restoration on erosive lesions: effect of dentin treatment with a chitosan nanoformulation containing green tea

Abstract

Aim: To evaluate the influence of the biomodification of erosive lesions with a chitosan nanoformulation containing green tea (NanoCsQ) on the clinical performance of a composite resin, Methods: The study was performed in a split-mouth, randomized and double-blinded model with 20 patients with 40 erosive lesions, The patient’s teeth were randomized into two groups (n=20) according to the surface treatment: 1) Without biomodification (control), and 2) Biomodification with NanoCsQ solution (experimental), The lesions were restored with adhesive (Tetric N-bond, Ivoclar) and composite resin (IPS Empress Direct, Ivoclar), The restorations were polished and 7 days (baseline), 6 months, and 12 months later were evaluated according to the United States Public Health Service (USPHS) modified criteria, using clinical exam and photographics, Data were analyzed by Friedman’s and Wilcoxon signed-rank tests, Results: No significant differences were found between the control and experimental groups (p=0,423), and also among the follow-up periods (baseline, six months, and 12 months) (p=0,50), Regarding the retention criteria, 90% of the restoration had an alpha score in the control group, Only 10% of the restorations without biomodification (control) had a score charlie at the 12-month follow-up, None of the patients reported post-operatory sensitivity, Conclusion: The NanoCsQ solution did not negatively affect the performance of the composite resin restorations after 12 months