The purpose of this investigation was to determine the effect of hydrofluoric (HF) acid etchant on composite’s resin matrix.
Samples of 7 composite materials (Charisma, Herculite XR, Silux Plus, Z100, Prisma APH, Command, Perfection) and 7 unfilled
materials with similar resin components as the composites (Gluma, Scotchbond, Fortify, Delton, Sealite, Visar Seal, and Triad) were
allowed to complete their polymerization for an additional 24 hrs. at 37˚C following the recommended curing procedures. Knoop