Novel CaF2 nanocomposite with high strength and fluoride ion release

Secondary caries and restoration fracture remain common problems in dentistry. this study tested the hypothesis that combining nano-caf2 and glass fillers would yield nanocomposites with high mechanical properties and f release. novel caf2 nanoparticles (56-nm) were synthesized via spray-drying and incorporated into resin. f release increased with increasing the nano-caf2 content,or with decreasing ph (p < 0.05). f-release rates at 70-84 days were 1.13 μg/(cm2•day) and 0.50 μg/ (cm2•day) for nanocomposites containing 30% and 20% nano-caf2,respectively. they matched the 0.65 μg/(cm 2•day) of resin-modified glass ionomer (p > 0.1). the nanocomposites had flexural strengths of 70-120 mpa,after 84-day immersion at ph 4,ph 5.5,and ph 7. these strengths were nearly three-fold that of resin-modified glass ionomer,and matched/exceeded a composite with little f release. in summary,novel caf2 nanoparticles produced high f release at low filler levels,thereby making room in resin for reinforcement glass. this yielded nanocomposites with high f-release and stress-bearing properties,which may help reduce secondary caries and restoration fracture.