Could readily silanized silica particles substitute silica coating and silanization in conditioning zirconium dioxide for resin adhesion?

Abstract

Particle deposition with silica-coated alumina followed by silane application increase the physico-chemical interaction between the resin cement and zirconia.Unfortunately, due to hydrolytic degradation of the silane, achieved adhesion decreases after aging conditions. Recently, readily silanized silica particles became available, that eliminates silanization procedures. This study investigated the effect of particle types with different morphology and surface properties on the surface wettability and adhesion of resin cement to zirconia after aging. Zirconia specimens (5x5x1 mm 3 ) (Emax ZirCAD, Ivoclar)were wet polished to 1200 grit silicone carbide abrasive and ultrasonically cleaned.Specimens were randomly assigned to one of the following surface conditioning protocols Failure types were exclusively adhesive in all groups. Weibull distribution presented lower 3 shape ( 0 ) for AL (7.7) and SIL (5.3) and the highest for SILP (10.8). Silane coated silica particles (SilJet Plus) presented better wettability on zirconia than with alumina or alumina particles coated with silica and provided similar bond strength on zirconia obtained with silica coated and silanized surfaces. Since no silane application is needed with readily silanized silica particles, it may be used as a substitute for conventional silica coating and silanization, reducing the clinical procedures.

Novel silane encapsulation system for tribochemical resin bonding to a Co-Cr alloy

“…The lack of statistically significant differences in the SBS and failure mode among CJ, SJ and SP groups show that the latter is at least equally efficient with the conventional two-step treatments, CJ and SJ. This is in agreement with the results obtained for SJ and SP on zirconia surfaces, where the two systems demonstrated no statistically significant difference in shear bond strength [30]. Consequently, the method of encapsulated silane in the blasting powder may be provisionally considered as a promising chairside procedure, by eliminating the time required for silane application and drying.…”

Different surface treatment protocols of a Y-TZP ceramic with a superficial glaze layer

“…This procedure promotes chemical adhesion between the ceramic surface and the resin cement organic matrix 3 . This happens by the attachment of silane monomers that react with the silica-coated surface within the silanol groups, thus forming hydrogen bonds and finally a covalently bonded very thin silane film 6,12 . Then, silane film with its free carbon-carbon double bonds reacts with the double bonds of resin composite luting cement 12 .…”

“…Six thousand thermal cycles was adopted in this research, which is a quantity also used by other researchers 3,12,16,23 . Some experimental group samples were lost during aging.…”

“…In order to achieve a durable bond between zirconia and resin cement, surface treatments are required to this material, creating micro mechanical -retentions [2][3][4][5][9][10][11] . They are: sandblasting with aluminum oxide particles 12 , sandblasting with silica-coated alumina 1,12,13 ; Er:YAG laser irradiation 1 and plasma spraying 14 .…”

“…The sandblasting with silica-coated alumina presents good bond results 1,12,13 . It can chemically modify the ceramic making it reactive with the resin, creates roughness and irregularities, what increases the surface area and the wettability, allowing the cement to flow 3,5,6,9,10,15 .…”