الفهرس | Only 14 pages are availabe for public view |
Abstract The aim of this study was to evaluate the effect of surface treatments (Hydrofluoric acid and Co2 laser) on the color change and shear bond strength of ceramic veneers. Twenty rectangular samples with dimensions (8x8x2) and another twenty samples with smaller dimensions (4x4x2) were cut from five IPS emax CAD blocks of shade A3. The samples were divided into 2 groups: 1) Half of the small and large blocks were subjected to hydrofluoric acid; 2) the other half was subjected to Co2 laser irradiation. The conditioned samples were subdivided according to the bonding agent: A) Silane application for 60 seconds; B) Single bond universal light cured for 10 seconds. Each small sample was cemented on the top of a large sample using Relyx veneer cement with translucent shade. The color change was measured using spectrophotometer. The shear bond strength was tested using a computerized universal testing machine. The results showed that HF resulted in higher bond shear bond strength and ΔE than Co2 laser. Single bond universal resulted in higher shear bond strength values than silane. It was concluded that HF followed by either single bond universal or silane could be the best surface treatment for e-max CAD ceramic. However, Co2 laser could be a promising alternative surface treatment. |