Ceramic surface preparations for resin bonding.
OBJECTIVE
To evaluate the effects of hydrofluoric acid (HF) and acidulated phosphate fluoride (APF) primers on differently prepared leucite-containing feldspar ceramic surfaces.


METHODS
Discs of a leucite-containing feldspar ceramic were prepared following the manufacturer's instructions. Surfaces were either polished, grit blasted or prepared with a diamond bur and then subjected to a range of etching procedures using HF or APF. The surface topography was examined using scanning electron microscopy (SEM). Back-scattered imaging, EDS and X-ray diffraction (XRD) were used for microstructural and compositional analysis.


RESULTS
The etching process with HF consisted of a preferential attack of the leucite phase relative to the glass but also removed all features of the previous surface preparation. In contrast, APF etching resulted in the formation of surface deposits, superimposed on the surface roughness created by the prior surface preparations. It was not possible to identify the deposits after APF etching using XRD.
Della Bona
A
A
University of Passo Fundo, School of Clinical Dentistry, Dept of Restorative Dentistry, RS, Brazil.
van Noort
R
R
D000134:Acid Etching, Dental / Q000379:methods*; D000149:Acidulated Phosphate Fluoride / Q000737:chemistry*; D000538:Aluminum Silicates; D018360:Crystallography, X-Ray; D001840:Dental Bonding; D003776:Dental Porcelain; D005069:Evaluation Studies as Topic; D005460:Fluorides, Topical / Q000737:chemistry*; D006858:Hydrofluoric Acid / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D017680:Potassium Compounds; D013499:Surface Properties; D014465:Ultrasonics
D000538:Aluminum Silicates; D005460:Fluorides, Topical; D017680:Potassium Compounds; C111131:VMK 68; D003776:Dental Porcelain; C016447:feldspar; C078519:leucite; D000149:Acidulated Phosphate Fluoride; D006858:Hydrofluoric Acid