Effect of silica coating combined to a MDP‐based primer on the resin bond to Y‐TZP ceramic

Abstract

The aim of this study was to evaluate the influence of silica coating and 10-methacryloyloxydecyl dihydrogen phosphate (MDP)-based primer applications upon the bonding durability of a MDP-based resin cement to a yttrium stabilized tetragonal zirconia (Y-TZP) ceramic. Ninety-six Y-TZP tabs were embedded in an acrylic resin (free surface for adhesion: 5 × 5 mm(2)), ground finished and randomly divided into four groups (N = 24) according to the ceramic surface conditioning: (1) cleaning with isopropanol (ALC); (2) ALC + phosphoric acid etching + MDP-based primer application (MDP-primer); (3) silica coating + 3-methacryloyloxypropyl trimethoxysilane (MPS)-based coupling agent application (SiO2 + MPS-Sil); and (4) SiO2 + MDP-primer. The MDP-based resin cement was applied on the treated surface using a cylindrical mold (diameter= 3 mm). Half of the specimens from each surface conditioning were stored in distilled water (37 °C, 24 h) before testing. Another half of the specimens were stored (90 days) and thermo-cycled (12,000 x) during this period (90 d/TC) before testing. A shear bond strength (SBS) test was performed at a crosshead speed of 0.5 mm/min. Two factors composed the experimental design: ceramic conditioning strategy (in four levels) and storage condition (in two levels), totaling eight groups. After 90 d/TC (Tukey; p < 0.05), SiO2 + MDP-primer (24.40 MPa) promoted the highest SBS. The ALC and MDP-primer groups debonded spontaneously during 90 d/TC. Bonding values were higher and more stable in the SiO2 groups. The use of MDP-primer after silica coating increased the bond strength.

Effect of ultrashort pulsed laser on bond strength of Y-TZP zirconia ceramic to tooth surfaces

“…Sandblasting with 30-µm silica-coated alumina showed similar results as Al 2O3. In all surface treatment groups, luting with MDPcontaining resin cement yielded higher SBS than with Bis-GMA-containing resin cement groups. This result agreed with the results of previous studies which reported higher bond strengths with the use of MDPbased primer 8,42) . This could be due to the capability of acidic functional monomer MDP reacting with the substrate [13][14][15][16][17][18][19] .…”

Adhesive bonding to polymer infiltrated ceramic

“…The reason for this may be the MDP content of CSA cement, which enables bonding to silicate ceramic and the ceramic part of polymer infiltrated ceramic. The MDP-monomer, with its phosphate ester group, binds directly to surface oxides, and its methacrylate group enables copolymerization with the resin matrix of the luting cement 14) . Silane coupling agents provided considerable bond strength both on SC and VE, since silicate surfaces such as SC or VE allow for covalent Si-O-Si bonds between ceramic and silane coupling molecules.…”

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

“…Thus, several surface conditioning methods have been suggested to condition zirconia surfaces physically and/or chemically where physico-chemical conditioning methods remain to be the best methods to increase adhesion of resin-based materials to zirconia [2][3][4][5][6][7][8][9][10].…”

“…Recently, silica particles have been introduced that are readily silanized, eliminating the silanization process, thereby also reducing the chairside procedures. It is not known to date whether such particles could substitute available abrasives used in conjunction with 5 chairside air-abrasion procedures and exclude the additional application of silane coupling agents.…”