XB with 61% filler volume had the highest microhardness values, followed by SDR, XF and VBF, with filler volume percentages of 45%, 38% and 38%, respectively(30-32).
Even though XF and VBF have the same amount of filler, significantly lower microhardness of VBF compared to XF was demonstrated.
The GSO, XF and VBF showed lower microhardness at the surface than at 2 mm.
Shannon, VBF has provided ever critical support in various ways to families and has been a much needed conduit of information to the public.
Programs include Babies with Birthmarks, Orphans with Birthmarks, and VBF Day of Awareness.