In vitro analysis of riboflavin-modified, experimental, two-step etch-and-rinse dentin adhesive: Fourier transform infrared spectroscopy and micro-Raman studies

Abstract

The strength of dental resin-based adhesives could be improved by adding light-activated riboflavin (RF, also known as vitamin B₂). Amr Fawzy and his team at the National University of Singapore, analysed the resin–dentin interface of human molars in which dentin was restored with adhesives containing different concentrations of RF. Following storage of the restored teeth for up to nine months in artificial saliva, they found that the strongest bonds formed with adhesives containing 3% RF. Scanning electron microscopy showed that this was due to RF’s crosslinking effect on dentin collagen fibrils. This is consistent with their previous findings that dentin pre-treatment with RF strengthens the collagen network. Adding 3% light-activated RF to dentin adhesives could make dental composite restorations more long-lasting without increasing the number of clinical steps required.

Keywords

bond failure / crosslinking / degree of conversion / dentin / experimental adhesive / riboflavin

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