The effect of blending herbal antioxidants with hydrogen peroxide and carbamide peroxide on dentin microhardness and microshear bond strength of resin-modified glass ionomer at dentin interface after walking bleach procedure: an in-vitro study

Abstract Objectives Evaluate the impact of blending Moringa oleifera and Rosemary leaf extracts with hydrogen peroxide (HP) and carbamide peroxide (CP) bleaching agents on dentin microhardness and microshear bond strength of resin-modified glass-ionomer at dentin interface after walking bleach procedure. Methodology Seventy endodontically treated human mandibular premolars were randomly split into three groups. Group I ( n = 10) where no bleaching was done, group II ( n = 30) used 30% HP as intracoronal bleaching agent where the samples equally subdivided into; subgroup A (only HP), subgroup B (HP + M. oleifera leaf extract), subgroup C (HP + Rosemary leaf extract). Group III ( n = 30) used 37% CP and the samples equally subdivided into; subgroup A (only CP), subgroup B (CP + M. oleifera leaf extract), subgroup C (CP + Rosemary leaf extract). Bleaching procedure was performed immediately after restoration with resin-modified glass ionomer restoration. Teeth were sectioned and underwent dentin microhardness and microshear bond strength tests before and after bleaching procedure. Data analysis was done using one-way analysis of variance. Results The results revealed notable decrease in microhardness and microshear bond strength mean values in all subgroups after different bleaching protocols ( P < 0.05). Also, the differences were statistically significant among subgroups received only bleaching agents and others subjected to either M. oleifera or Rosemary leaf extracts treatment with the bleaching agents. Conclusion M. oleifera and Rosemary leaf extracts could reverse the reduced microhardness and bond strength mean values as they can be future candidates to be used as antioxidants after bleaching.