a change in classification of plaque fluoride compartments is necessary , since recent work indicates that there are two pools of plaque f : less than 5 % of the total f is in plaque fluid as the free ion , and the large remaining portion of total plaque f is designated as bound f , with the total f being greater than 95 % extractable by cold 0.5 mol/l perchloric acid .
C0011389
plaque
C0016327
f