“Effect of Hydrofluoric Acid on the Hardness of Dental Resins”. Egyptian Dental Journal. Vol. 46, No. 3, July, 2000. Yousra Al-Jazairy

Journal Article

مستخلص المنشور

 

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

hardness measurements were made on the cured surfaces immediately after curing (controls) and after 1 and 6 minutes of etching

with a 15% HF acid solution (CeramEtch).

After etching, samples were dried and stored for a minimum of 30 minutes at 37˚C. Five

readings on each of two samples of each material were taken. Analysis of repeated measures ANOVA showed statistically

significant differences between unfilled and filled composite resins (P<0.001). There was no significant difference in hardness

between unetched and HF unfilled resin groups (p<0.1). On the other hand, there was a significant difference between the unetched

and etched composite resin groups (p<0.0001). HF acid etching does not soften the unfilled resins evaluated in this study, but

softens the composite resin materials. Therefore, caution should be performed when using composite resins with any substance that

contains HF acid.