الفهرس 
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Abstract
For the time being there is a variety of dental ceramics available. Several classifications of the ceramics have been suggested which include classification according to microstructure, technique of processing and presence of specific attributes in their formulation.
Zirconia represents a valuable material that combines both color acceptance and ability to withstand high loads. It has been reported that sintering of Zirconia followed by air-borne particle abrasion affects its strength. The effect of air-borne particle abrasion/sintering sequence on shear bond strength of resin cements to Zirconia was found non-significant. However the effect of sequence on the flexural strength has not been reported. The Ivoclare Vivadent manufacturer recommendation is to sinter the Zirconia before subjecting it to any air-borne particle abrasion.
The aim of the study is to evaluate the effect of air-borne particle abrasion/sintering sequence on the flexural strength of Zirconia. The materials and methods has been presented where forty bars of dimensions (26 × 6 × 1.5) millimeter were fabricated from IPS e-max zircad. The total number of specimens was divided into two equal groups (A and B). The specimens of group A (AS) were subjected to air-borne particle abrasion followed by sintering. While the specimens of group B (SA) were sintered before air-borne particle abrasion.
Specimens of each group were subjected to X-Ray Diffraction to show monoclinic-tetragonal phases percentage. Three-point loading was applied to all specimens to measure the flexural strength using a Universal Testing Machine followed by X-Ray Diffraction evaluation.
At statistically significant level p ≤ 0.05 group SA showed significantly higher flexural strength compared to group AS. Air-borne particle abraded surface of group SA showed the highest amount of monoclinic phase crystals after X-Ray Diffraction analysis.