Comparison of acidulated phosphate fluoride gel and hydrofluoric acid etchants for porcelain-composite repair.
Hydrofluoric acid etches porcelain to produce a porous surface visible under scanning electron microscopy when compared to an acidulated phosphate fluoride gel. Some investigators have suggested the greater porosity of the hydrofluoric acid etch produces a greater composite-to-porcelain bond. This investigation tested that assumption with two common fluoride etchants. The etched surfaces were first viewed under scanning electron microscopy to ensure that a characteristic etch was achieved. Both etchants yielded bond strengths that produced cohesive failure of all samples. This suggested that the intraoral use of hydrofluoric acid is no more effective than the less dangerous acidulated phosphate fluoride gel.
Tylka
D F
DF
Department of Restorative Dentistry, School of Dental Medicine, Southern Illinois University, Alton.
Stewart
G P
GP
D000134:Acid Etching, Dental / Q000379:methods; D000149:Acidulated Phosphate Fluoride / Q000737:chemistry*; D000704:Analysis of Variance; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003188:Composite Resins / Q000737:chemistry; D003485:Cyanates / Q000737:chemistry; D003487:Cyanoacrylates / Q000737:chemistry; D001840:Dental Bonding; D003776:Dental Porcelain / Q000737:chemistry*; D003780:Denture Repair / Q000379:methods*; D006858:Hydrofluoric Acid / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D013718:Tensile Strength
D003188:Composite Resins; D003485:Cyanates; D003487:Cyanoacrylates; D003776:Dental Porcelain; D000149:Acidulated Phosphate Fluoride; C081267:Willceram porcelain; C010867:EDH adhesive; D006858:Hydrofluoric Acid