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    Effect of silane and MDP-based primers on physico-chemical properties of zirconia and its bond strength to resin cement

    Year: 2019

    Journal: Dent. Mater., Volume 35, NOV, page 1557–1567

    Authors: Wanderley Lima, Renally Bezerra; Barreto, Suelem Chasse; Alfrisany, Najm Mohsen; Porto, Thiago Soares; De Souza, Grace Mendonca; De Goes, Mario Fernando

    Organizations: Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES)Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [001]

    Keywords: Y-TZP; Adhesion; Phosphate ester; Air abrasion

    Objective. To evaluate the effect of surface treatments on yttria-tetragonal zirconia polycrystal (Y-TZP) characteristics and on resin-mediated zirconia bond. Methods. Y-TZP slabs were grit blasted with 45 mu m alumina or with 30 mu m silica coated alumina particles. The chemical treatments were: no-chemical treatment (NC), silane-containing primer (SP), MDP (10-Methacryloyloxydecyl dihydrogen phosphate) and silane-containing primer (MPS), MDP-containing primer (MP) and MDP and silane-containing adhesive (MPA). Contact angle as a function of surface roughness (theta(m)) and surface roughness parameter (Sdr) were measured using Fringe Projection Phase Shifting (FPPS). Surface free energy (gamma s(TOT)) was calculated with a goniometer. Chemical interaction between primers/adhesive and zirconia was analyzed using time-of-flight secondary ion mass spectrometry (ToF-SIMS). Resin cement microshear bond strength (mu SBS) was analyzed at either 24-h or 8-months water storage (37 degrees C). theta(m) values, Sdr values, gamma s(TOT) and mu SBS values were analyzed using Analysis of variance (ANOVA) and post hoc Tukey test (alpha = 0.05). Results. Chemical treatment had an effect (p<0.001) on all surface parameters analyzed: theta(m), gamma s(TOT) and Sdr. MP-treated group showed higher incidence of P-O-Zr bonds than the other groups, indicating more chemical linkages. Grit blasting (p < 0.001) and the interaction chemical treatment*storage (p <0.001) did not affect mu SBS; all silane-containing primers showed significant drop in mu SBS after aging. Significance. MDP and/or silane-based solutions affect the physicochemical properties of blasted-zirconia. An MDP-based primer is fundamental to achieve a stable resin-zirconia bonding, but the chemical reactivity of MDP is impaired when this molecule is present in a multicomponent system. (C) 2019 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.
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