Correlation of topography to bond strength of etched ceramic

Purpose: Bonding techniques are commonly used today to ensure the durabilit y of porcelain laminate veneers and ceramic inlay-onlays, which are estheti cally pleasing solutions to the problem of dental restoration. Acid etching and silanization of porcelain have been widely used to enhance the retenti on between bonding resins and ceramic restorations. The purpose of this stu dy was to evaluate the effect of surface modifications with 10% hydrofluori c acid gel and a coupling agent (a dual component silane) on the bond stren gth of 2 dental feldspathic ceramics (GC and PVS) bonded with an unfilled r esin (Super-Bond). Materials and Methods: Eighty samples of CC and eighty s amples of PVS were built for a mechanical study. Mechanical tests were cond ucted using a Lloyd T 6000 R tensile machine, which determined the bond str engths of the 2 ceramics after different surface treatments (etching or sil anization). In the next part of the study, 10 surfaces of GC and 10 surface s of PVS were studied with a scanning mechanical microscope to evaluate the action of hydrofluoric acid gel on the rough ness of the 2 ceramics. Resul ts: Etching ceramic with hydrofluoric acid gel increased the developed surf ace of feldspathic ceramics, especially for PVS, but this treatment was not sufficient to obtain the highest shear bond strength. The highly positive influence of silanization was shown, particularly for GC ceramic bonded wit h an unfilled resin. Conclusion: Silane combined with the action of hydrofl uoric acid gel is the most effective surface treatment for ceramic.