The frequency of complete penetration of two commercial BIS-GMA resin pit and
fissure coating materials into wide and constricted fissures was assessed from
photomicrographs. It was found that 334 of the 390 wide fissures examined were
completely filled by the coating materials. However, in contrast, only 28 of the
650 constricted fissures examined were completely filled by these resins.
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