Fluoride-Releasing, Automix Composite Core Build-up Material. If light-curing is not an option – allow CompCore™ AF to self-cure in 4.5 minutes intraorally! CompCore AF composite core build-up material utilizes exclusive Hyperbranched Technology™1 and nano-fillers for superior mechanical properties and long term clinical success - available in automix SyringeMix™ and cartridge dispensers.