Comparison of Shear Bond Strengths of Self-Adhesive Luting Cements on Ceramics & Ceramic Hybrid Materials

Objectives: To compare the in vitro shear bond strength of an experimental EDS self-adhesive (SA) luting cement with other commercially available SA luting cements, namely, RelyX Unicem 2, Maxcem Elite, and SpeedCem.
Methods: The study was conducted by light curing self-adhesive luting cements using a translucent conical mold (dimensions: r₁ = 5 mm, r₂ = 7 mm, h = 9 mm) to ingots of four different types of substrates: zirconia (Bruxzir), lithium disilicate (IPS e.max Press), resin nano-ceramics (Lava Ultimate), and a hybrid ceramic composite (Vita Enamic). The test specimens were mounted in cylindrical molds of acrylic and then incubated for 24 hours at 37 ^OC in 100% humidity. Shear bond strength was measured using an MTS load frame, Model 42, equipped with a 1000 N load cell. The peak load required (N) to break the bond between the cement and the substrate was recorded. Bond strength (mPa) was calculated using the following formula:
Results: The average strengths of the adhesives on various composites (mPa) is shown in table (see attached)
Conclusions: The study shows that the new EDS self-adhesive luting cement has superior bond strength when adhered to the various ceramic surfaces.