Abstract :
To investigate the effect of silica abrasion, hot silica abrasion, e-max particles abrasion, and alumina abrasion on shear bond strength of resin cement to three different types of zirconia (Opaque, High translucency, and Ultra translucency). The study was divided into 3 groups according to zirconia type (n=60) Opaque zirconia (O), High translucent zirconia (H), and Ultra translucent zirconia (U). Each group was further divided into 6 subgroups according to surface treatment used (n=10): Silica Particle Abrasion (S), e.max Particle Abrasion (E), Pre-sintering e.max Particle Abrasion (PE), Pre-sintering Silica Particle Abrasion (PS), Hot silica particle Abrasion (H), and Alumina Particle Abrasion (A). Composite cylinder shaped 1cm length, 5 mm in diameter were fabricated to house resin composite discoid, the composite cylinder was cemented centrally to the zirconia cubes with light cure under 5kg weight for 6 mins. The shear bond strength of the specimens was measured utilizing a universal testing machine at a crosshead speed of 0.5 mm/min. Failure loads were recorded in Newton. SBS was calculated according to the following equation: SBS (MPa) = load (N)/area (mm2) through one-way ANOVA. Highest SBS values were that of Alumina Particle abrasion (A) subgroups of (15 ∓2.1, 14.2 ∓2.5 and 13∓2.3) min Ultra-translucency, Opaque and High-translucency respectively. While the lowest was the Silica Particle abrasion (S) subgroup of (2.5∓0.6, 2.5∓0.6, and 2.7∓0.9) min Opaque, High- translucency, and Ultra-translucency respectively. Alumina Particle abrasion (A) with prime showed higher SBS values than other abrasion surface treatments.
