The influence of resin cement thicknesses on shear bond strength of the cement-zirconia
Apichai Maneenacarith, Thanasak Rakmanee, Awiruth Klaisiri
Abstract
Zirconia is a polycrystalline ceramic with no glassy phase like other glass ceramics. To gain a suitable retention, zirconia present some inherent problems. Surface treatment of etched zirconia with hydrofluoric acid does not adequately roughen the surface for the purpose of retention, while grinding zirconia to create surface roughness is often used as an option to improve its' mechanical bonding. Objectives: The study examined the influence of resin cement thicknesses on shear bond strength of zirconia treated with a universal adhesive. Material and methods: Forty zirconia specimens were prepared, surface-treated with universal adhesive, and divided into 4 groups according to resin thicknesses (50, 80, 160, and 240 m). All samples were stored in 37C distilled water for 24 hours. Shear bond strength was performed using a universal testing machine at a 0.5 mm/min crosshead speed, until failure. Failure modes were analyzed using stereomicroscope at a magnification of 50. Results were statistically analyzed by one-way ANOVA and Tukey's multiple comparison tests.