Silanated Surface Treatment: Effects on the Bond Strength to Lithium Disilicate Glass-Ceramic

Abstract

The aim of this study was to evaluate the effect of silanization protocols on the bond strength of two resin cements to a lithium disilicate glass-ceramic. Thirty-two ceramic discs were assigned to 2 groups (n=16): G1 -dual-cured resin cement and G2 -lightcured resin cement. Four subgroups were evaluated according to the used silanization protocol. The glass-ceramic was etched with 10% hydrofluoric acid for 20 s and silane was applied for 1 min, as follows: CTL -according to the manufacturer's instructions; HA -dried with hot air; NWA -washed and dried with water and air at room temperature; HWA -washed and dried with hot water and hot air. Thereafter, adhesive was applied and light-cured for 20 s. Silicon molds were used to prepare resin cement cylinders (1x1 mm) on the ceramic surface. The specimens were stored in deionized water at 37 °C for 48 h and subjected to a micro-shear test. The data were submitted to statistical analysis (α=0.05). Group G1 showed higher bond strengths than G2, except for the CTL and NWA subgroups. Differences as function of the silanization protocol were only observed in G1: HWA (25.13±6.83)≥HA (22.95±7.78)≥CTL(17.44±7.24) ≥NWA(14.63±8.76). For G2 there was no difference among the subgroups. In conclusion, the silanization protocol affected the resin cement/ceramic bond strengths, depending on the material. Washing/drying with hot water and/or hot air increased only the bond strength of the dual-cured resin cement.S i l a n a t e d S u r f a c e T r e a t m e n t : Effects on the Bond Strength to Lithium Disilicate Glass-Ceramic

Digital smile designing, pressing and stratifying ceramic lithium disilicate veneers to rehabilitate dental agenesis: a clinical report

“…This is due to the elimination of alcohol, water and other by-products from the ceramic surface. In addition, the heat treatment helps complete the condensation reaction between silicate and silane, making it more effective and stable [35][36][37].…”

Influence of different surface treatments of fiberglass posts on the bond strength to dentin

“…The use of heat-treated silane on the post surfaces is less common than its use to treat feldpsathic or glass ceramics before cementation. 35,36 The rationale for using hot air jets after silane application relies on the fact that it eliminates alcohol, water and other by-products of the reaction of silane with the substrate 37 of alcohol evaporation may increase the local density of available connections 38 . In addition, after heat-treating the silane, higher bond strength values may be achieved due to the removal of the upper layers of silane, leaving a more stable silane layer at the bonding interface 37 .…”

Microstructural and mechanical analysis of two CAD-CAM lithium disilicate glass-reinforced ceramics

“…XRD scanning was carried out using the Cu-K1 emission (λ = 1.54056Å), generating a current of 15mA, 30kV, a wavelength equal to 1.5406Å, and a continuous scanning interval of 2θ (20-80), with a step of 0.02 s. The XRD patterns were compared with the JCPDS (Joint Committee on Powder Diffraction Standard) to identify the type of crystal and crystalline phase of both ceramic materials. 2,3,4,5,6,7,8 Two specimens were selected from each group (pre-crystallized and crystallized) to perform the structural analysis. Crystallization of the specimens was performed using a special furnace (Programat P300, Ivoclar Vivadent, Schaan, Liechtenstein), together with the P91 program.…”

“…Three specimens were obtained from each ceramic material, with a cubic format (± 4.0mm 3 ) for pore evaluation, and 3D reconstruction using µCT scanner (Skyscan 1272, Bruker, Kontich, Belgium). The specimens were also sectioned from the ceramic blocks at the pre-crystallized stage, and then submitted to crystallization as described earlier.…”

“…1 Its excellent resistance to fracture (± 380 MPa), 2 good esthetics, and satisfactory bond strength to resin cements, when adequate surface Declaration of Interests: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript. treatment is provided (± 18.00 MPa), 3 are factors favoring the growing acceptance of these ceramic materials. Additionally, the possibility of milling this ceramic using simplified fabrication methods, such as laboratory and chairside computer-aided design/computer-aided manufacturing (CAD-CAM) systems, 4,5,6 is another important advantage contributing to its excellent clinical approval.…”