Adhesion of Glass Ionomer Restorative Material to SDF Treated Dentin

Objectives: Silver diamine fluoride (SDF) is indicated for hypersensitivity reduction by blocking dentin tubules with the precipitation of silver containing particles. SDF is also an antimicrobial agent with silver and fluoride ions in the composition. There is a potential to use SDF as pre-treatment in different dental procedures to achieve robust restorations as a minimally invasive dentistry approach. This study investigated whether the application of SDF to dentin surface affected bond strength values of a glass ionomer (GI) restorative material.
Methods: Bovine crowns (obtained from a packing plant) were potted in acrylic and polished/smoothed using 120 and 320 grit sandpaper, respectively. The specimens were divided in two groups: Control (no pre-treatment) and SDF treated. SDF treated samples were air dried to remove excess water from the dentin surface, 38% SDF (Elevate Oral Care®) was then applied for 10s, rinsed with water after 1 minute to remove excess SDF, and then blot-dried to remove excess water. 3M™ Ketac™ Universal Aplicap™ Glass Ionomer Restorative was bonded to control and SDF treated samples using a 4.8mmx2mm PTFE mold and cured in a 37°C 95% RH chamber for 20 minutes. The bonded samples were stored in 37°C DI water for at least 24hr prior adhesion testing. Shear bonding testing method was conducted on an Instron system (crosshead speed: 1 mm/min). Results were compared using one-way ANOVA with Tukey’s test (p<0.05).
Results: The table below shows the shear bond strength mean values/Standard deviation (SD) for control and SDF treated dentin.
Conclusions: This study showed there was no significant difference between different procedures for dentin adhesion study. SDF pretreatment had no negative impact on GI bonding to the dentin surface. There is potential to combine the SDF pretreatment on dentin surface with a GI dental filling material in minimally invasive dental procedures.