Effects of the ratio of silane to 10-methacryloyloxydecyl dihydrogenphosphate (MDP) in primer on bonding performance of silica-based and zirconia ceramics

The purpose of the study was to evaluate the effects of the ratio of different concentrations of silane to 1 wt% 10-methacryloyloxydecyl dihydrogenphosphate (MDP) in primer on the performance and durability of bonding to silica-based and zirconia ceramics. Phosphoric acid–treated lithium–disilicate (LD) and alumina-blasted zirconia specimens were assigned to five groups according to surface chemical treatment with different concentrations of γ-methacryloxypropyltrimethoxysilane (γ-MPTS) to 1 wt% MDP containing primer as follows: S0) without γ-MPTS; S1) 1 wt% γ-MPTS; S2) 2 wt% γ-MPTS; S5) 5 wt% γ-MPTS and S10) 10 wt% γ-MPTS. After priming, stainless-steel rods were bonded to the specimens with PanaviaV5 cement. Tensile bond strength (TBS) test was evaluated after 24-h (TC0) or 5000 thermocycling (TC5K). The wettability of primer-treated surfaces was measured using contact angle measurements. Surface elemental composition of zirconia was determined with X-ray photoelectron spectroscopy (XPS). The TBS data were analyzed using Weibull analysis. Contact angle data were analyzed by three-way analysis of variance (α = 0.05). Before thermocycling, S5 (34.3 ± 4.5 MPa) showed the highest TBS compared to S1 (27.8 ± 5.2 MPa) and S2 (29.7 ± 4.8 MPa), and insignificant difference with S10 (30.6 ± 6.2 MPa) in LD. For zirconia there was no significant difference in all silane containing primers with S0 (p > 0.05). Thermocycling decreased TBS for all experimental groups among both ceramics (p