Impact of Bioactive Glass and Epigallocatechin Gallate Remineralisation on Shear Bond Strength of Composite Resin to Enamel – Post Aerated Drink Exposure

Abstract Aim and Objective: To evaluate and compare the shear bond strength of composite resin to enamel following remineralization with Bioactive Glass (BAG) and epigallocatechin gallate (EGCG). Materials and Methods: Thirty extracted human maxillary premolars were selected and randomly divided into two experimental groups and one control group (n = 10 per group). All samples were demineralized by immersion in a carbonated soft drink for 5 minutes twice daily for 7 days. Group I served as the control and received no remineralization treatment. Group II underwent remineralization with Bioactive Glass, while Group III was treated with EGCG. All specimens were stored in artificial saliva. After the remineralization phase, the labial surfaces of the teeth were etched with phosphoric acid, bonded with adhesive, and restored with composite resin using a Teflon mold (4 mm diameter × 3 mm height). The shear bond strength was then tested using a universal testing machine. Results: Multiple comparisons of mean differences between groups showed that Group II (Bioactive Glass) demonstrated the highest mean shear bond strength, followed by Group I (control) and Group III (green tea), which showed the lowest bond strength. Conclusion: Bioactive Glass (BAG) can be considered an effective remineralizing agent for erosive enamel lesions, as it significantly increased the shear bond strength of composite resin restorations in this study. Although the remineralization potential of green tea extract (EGCG) is well recognized, the present findings suggest it may have a detrimental effect on bond strength when used alone. Therefore, adjusting the etching time or modifying the application protocol may be necessary when using EGCG to optimize adhesion to eroded enamel.