Effects of silver diammine fluoride on bond strength of adhesives to sound dentin

Abstract

This study evaluated bonding of adhesives to dentin treated with silver diammine fluoride (SDF). Micro-shear bond strength (MSBS) to sound human dentin was investigated for 3 adhesive systems: Clearfil SE bond 2 (CSE), and Scotchbond Universal in self-etching (SBU) and phosphoric acid-etching (SBT) modes, following 4 different SDF application protocols (n=10); Control: treated with deionized water. P1: SDF applied for 10-s, no rinse. P2: SDF applied for 10-s, rinsed off after 1-min. P3: superficial dentin polished off after 24-h following P1. MSBS data were obtained after 24-h water storage at 37°C. SDF significantly affected MSBS to dentin depending on the SDF protocol and adhesive system. Rinsing SDF off improved bond strength but superficial refreshing of SDF-treated dentin prior to bonding showed the highest bond strength. The two-step self-etch adhesive (CSE) and the universal adhesive in acid-etching mode (SBT) showed better performance than universal adhesive (SBU) alone on SDF treated dentin.