Effect of Self-Etching Primer Associated to Hydrofluoric acid or Silane on Bonding to Lithium Disilicate

Abstract

To evaluate the effect of combining 5% hydrofluoric acid (HF) and silane (SI) with the selfetching ceramic primer on the immediate and after 1-year of water storage on bonding efficacy, conditioning pattern (CP) and chemical interaction (CI) to the lithium disilicate. A total of 16 CAD/CAM blocks of lithium disilicate (LD) were cut into four square sections (n=64). For bonding efficacy evaluation, the LD specimens were divided into 4 groups (n=10): 1) HF+SI; 2) self-etching ceramic primer (MEP); 3) HF+MEP; 4) MEP+SI. After each treatment, an adhesive system was applied and Tygon matrices were filled with a dualcured resin cement followed by light curing. Cylinder specimens (0.8 mm∅x0.5mm) were stored in water (37 °C for 24 h or 1-year) and submitted to the μSBS test (2-way ANOVA and Tukey's test; α=0.05). CP and CI were only evaluated qualitatively. No significant difference on the μSBS was observed between groups (p=0.73), but reduced μSBS was observed after 1-year of water storage (p>0.0001). After application of HF+SI and MEP, reduction in a number of siloxane bonds was observed, suggesting the coupling of SI on the LD surface. HF or HF+MEP produced a higher dissolution of the glassy matrix than the use of MEP alone. The MEP can be an alternative to traditional ceramic treatment once the chemical interaction and long-term bond strength were similar between both groups. The association of hydrofluoric acid or silane with a self-etching ceramic primer did not add any benefits in terms of chemical interaction and bonding stability.

Influence of resin cement and thermocycling on milled lithium disilicate ceramic microshear bond strength

“…Findings in the present study are only clinically acceptable (13-30 Mpa) 12 for dual-cure resin cement after one-year simulated aging, regardless of the microshear bond strength values. According to previous studies 14,23…”

Influence of Shear Bonding Strength of Lithium Disilicate to Enamel under Different Surface Treatments

“…Lower adhesion strength values with the one-step conditioning system were also reported by Prochnow et al 20 The glassy phase in the ceramic is etched by using prime liquid and Monoband Etch for creating low surface roughness. Siqueira et al 1 have indicated that the one-step conditioning system is used for the glassy phase when the ceramic surface was etched.…”

“…Several surface treatments regarding chemical bonding and micromechanical retention were suggested to enhance resin cement bonding to ceramics. 1,2 The best surface treatment to be utilized is determined through the composition of the ceramic. Similarly, the effect of etching protocols used on glass matrix ceramics has been examined by several studies.…”

Ceramic Bonding Interface under Shear–Compression Stress: Ultra-High-Speed Imaging Contribution

“…Concomitantly, with clinical consideration, we decided to compare 2 ceramic pretreatments. Classically, the ceramic intaglio is conditioned with hydrofluoric acid (HF), allowing a selective elimination of the vitreous matrix causing a roughness of the ceramic and more surface energy (Siqueira et al 2019). Then, a primer containing organo-silane is applied to promote bifunctional and durable adhesion (Blatz et al 2003; Dejak and Mlotkowski 2008; Lise et al 2015).…”